Mercurial > hg > octave-lyh > gnulib-hg
changeset 2189:b3a1fc0708cb
.
author | Jim Meyering <jim@meyering.net> |
---|---|
date | Sun, 23 Jan 2000 09:08:39 +0000 |
parents | 8a9eac640e4d |
children | 372ed6956826 |
files | lib/rx.c lib/rx.h |
diffstat | 2 files changed, 0 insertions(+), 10917 deletions(-) [+] |
line wrap: on
line diff
deleted file mode 100644 --- a/lib/rx.c +++ /dev/null @@ -1,7185 +0,0 @@ -/* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc. - -This file is part of the librx library. - -Librx is free software; you can redistribute it and/or modify it under -the terms of the GNU Library General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -Librx is distributed in the hope that it will be useful, but WITHOUT -ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or -FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -for more details. - -You should have received a copy of the GNU Library General Public -License along with this software; see the file COPYING.LIB. If not, -write to the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ - -/* NOTE!!! AIX is so losing it requires this to be the first thing in the - * file. - * Do not put ANYTHING before it! - */ -#if !defined (__GNUC__) && defined (_AIX) - #pragma alloca -#endif - -/* To make linux happy? */ -#ifndef _GNU_SOURCE -#define _GNU_SOURCE -#endif - -#if HAVE_CONFIG_H -#include <config.h> -#endif - -const char *rx_version_string = "GNU Rx version 0.07.2"; - - /* ``Too hard!'' - * -- anon. - */ - - -#include <stdio.h> -#include <ctype.h> -#ifndef isgraph -#define isgraph(c) (isprint (c) && !isspace (c)) -#endif -#ifndef isblank -#define isblank(c) ((c) == ' ' || (c) == '\t') -#endif - -#include <sys/types.h> - -#undef MAX -#undef MIN -#define MAX(a, b) ((a) > (b) ? (a) : (b)) -#define MIN(a, b) ((a) < (b) ? (a) : (b)) - -typedef char boolean; -#define false 0 -#define true 1 - -#ifndef __GCC__ -#undef __inline__ -#define __inline__ -#endif - -/* Emacs already defines alloca, sometimes. */ -#ifndef alloca - -/* Make alloca work the best possible way. */ -#ifdef __GNUC__ -#define alloca __builtin_alloca -#else /* not __GNUC__ */ -#if HAVE_ALLOCA_H -#include <alloca.h> -#else /* not __GNUC__ or HAVE_ALLOCA_H */ -#ifndef _AIX /* Already did AIX, up at the top. */ -char *alloca (); -#endif /* not _AIX */ -#endif /* not HAVE_ALLOCA_H */ -#endif /* not __GNUC__ */ - -#endif /* not alloca */ - -/* Memory management and stuff for emacs. */ - -#define CHARBITS 8 -#define remalloc(M, S) (M ? realloc (M, S) : malloc (S)) - - -/* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we - * use `alloca' instead of `malloc' for the backtracking stack. - * - * Emacs will die miserably if we don't do this. - */ - -#ifdef REGEX_MALLOC -#define REGEX_ALLOCATE malloc -#else /* not REGEX_MALLOC */ -#define REGEX_ALLOCATE alloca -#endif /* not REGEX_MALLOC */ - - -#ifdef RX_WANT_RX_DEFS -#define RX_DECL extern -#define RX_DEF_QUAL -#else -#define RX_WANT_RX_DEFS -#define RX_DECL static -#define RX_DEF_QUAL static -#endif -#include "rx.h" -#undef RX_DECL -#define RX_DECL RX_DEF_QUAL - - -#ifndef emacs - -#ifndef SYNTAX - -RX_DECL char re_syntax_table[CHAR_SET_SIZE]; - -#ifdef __STDC__ -static void -init_syntax_once (void) -#else -static void -init_syntax_once () -#endif -{ - register int c; - static int done = 0; - - if (done) - return; - - bzero (re_syntax_table, sizeof re_syntax_table); - - for (c = 'a'; c <= 'z'; c++) - re_syntax_table[c] = Sword; - - for (c = 'A'; c <= 'Z'; c++) - re_syntax_table[c] = Sword; - - for (c = '0'; c <= '9'; c++) - re_syntax_table[c] = Sword; - - re_syntax_table['_'] = Sword; - - done = 1; -} -#endif /* not SYNTAX */ -#endif /* not emacs */ - -/* Compile with `-DRX_DEBUG' and use the following flags. - * - * Debugging flags: - * rx_debug - print information as a regexp is compiled - * rx_debug_trace - print information as a regexp is executed - */ - -#ifdef RX_DEBUG - -int rx_debug_compile = 0; -int rx_debug_trace = 0; -static struct re_pattern_buffer * dbug_rxb = 0; - -#ifdef __STDC__ -typedef void (*side_effect_printer) (struct rx *, void *, FILE *); -#else -typedef void (*side_effect_printer) (); -#endif - -#ifdef __STDC__ -static void print_cset (struct rx *rx, rx_Bitset cset, FILE * fp); -#else -static void print_cset (); -#endif - -#ifdef __STDC__ -static void -print_rexp (struct rx *rx, - struct rexp_node *node, int depth, - side_effect_printer seprint, FILE * fp) -#else -static void -print_rexp (rx, node, depth, seprint, fp) - struct rx *rx; - struct rexp_node *node; - int depth; - side_effect_printer seprint; - FILE * fp; -#endif -{ - if (!node) - return; - else - { - switch (node->type) - { - case r_cset: - { - fprintf (fp, "%*s", depth, ""); - print_cset (rx, node->params.cset, fp); - fputc ('\n', fp); - break; - } - - case r_opt: - case r_star: - fprintf (fp, "%*s%s\n", depth, "", - node->type == r_opt ? "opt" : "star"); - print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp); - break; - - case r_2phase_star: - fprintf (fp, "%*s2phase star\n", depth, ""); - print_rexp (rx, node->params.pair.right, depth + 3, seprint, fp); - print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp); - break; - - - case r_alternate: - case r_concat: - fprintf (fp, "%*s%s\n", depth, "", - node->type == r_alternate ? "alt" : "concat"); - print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp); - print_rexp (rx, node->params.pair.right, depth + 3, seprint, fp); - break; - case r_side_effect: - fprintf (fp, "%*sSide effect: ", depth, ""); - seprint (rx, node->params.side_effect, fp); - fputc ('\n', fp); - } - } -} - -#ifdef __STDC__ -static void -print_nfa (struct rx * rx, - struct rx_nfa_state * n, - side_effect_printer seprint, FILE * fp) -#else -static void -print_nfa (rx, n, seprint, fp) - struct rx * rx; - struct rx_nfa_state * n; - side_effect_printer seprint; - FILE * fp; -#endif -{ - while (n) - { - struct rx_nfa_edge *e = n->edges; - struct rx_possible_future *ec = n->futures; - fprintf (fp, "node %d %s\n", n->id, - n->is_final ? "final" : (n->is_start ? "start" : "")); - while (e) - { - fprintf (fp, " edge to %d, ", e->dest->id); - switch (e->type) - { - case ne_epsilon: - fprintf (fp, "epsilon\n"); - break; - case ne_side_effect: - fprintf (fp, "side effect "); - seprint (rx, e->params.side_effect, fp); - fputc ('\n', fp); - break; - case ne_cset: - fprintf (fp, "cset "); - print_cset (rx, e->params.cset, fp); - fputc ('\n', fp); - break; - } - e = e->next; - } - - while (ec) - { - int x; - struct rx_nfa_state_set * s; - struct rx_se_list * l; - fprintf (fp, " eclosure to {"); - for (s = ec->destset; s; s = s->cdr) - fprintf (fp, "%d ", s->car->id); - fprintf (fp, "} ("); - for (l = ec->effects; l; l = l->cdr) - { - seprint (rx, l->car, fp); - fputc (' ', fp); - } - fprintf (fp, ")\n"); - ec = ec->next; - } - n = n->next; - } -} - -static char * efnames [] = -{ - "bogon", - "re_se_try", - "re_se_pushback", - "re_se_push0", - "re_se_pushpos", - "re_se_chkpos", - "re_se_poppos", - "re_se_at_dot", - "re_se_syntax", - "re_se_not_syntax", - "re_se_begbuf", - "re_se_hat", - "re_se_wordbeg", - "re_se_wordbound", - "re_se_notwordbound", - "re_se_wordend", - "re_se_endbuf", - "re_se_dollar", - "re_se_fail", -}; - -static char * efnames2[] = -{ - "re_se_win", - "re_se_lparen", - "re_se_rparen", - "re_se_backref", - "re_se_iter", - "re_se_end_iter", - "re_se_tv" -}; - -static char * inx_names[] = -{ - "rx_backtrack_point", - "rx_do_side_effects", - "rx_cache_miss", - "rx_next_char", - "rx_backtrack", - "rx_error_inx", - "rx_num_instructions" -}; - - -#ifdef __STDC__ -static void -re_seprint (struct rx * rx, void * effect, FILE * fp) -#else -static void -re_seprint (rx, effect, fp) - struct rx * rx; - void * effect; - FILE * fp; -#endif -{ - if ((int)effect < 0) - fputs (efnames[-(int)effect], fp); - else if (dbug_rxb) - { - struct re_se_params * p = &dbug_rxb->se_params[(int)effect]; - fprintf (fp, "%s(%d,%d)", efnames2[p->se], p->op1, p->op2); - } - else - fprintf (fp, "[complex op # %d]", (int)effect); -} - - -/* These are so the regex.c regression tests will compile. */ -void -print_compiled_pattern (rxb) - struct re_pattern_buffer * rxb; -{ -} - -void -print_fastmap (fm) - char * fm; -{ -} - -#endif /* RX_DEBUG */ - - - -/* This page: Bitsets. Completely unintersting. */ - -#ifdef __STDC__ -RX_DECL int -rx_bitset_is_equal (int size, rx_Bitset a, rx_Bitset b) -#else -RX_DECL int -rx_bitset_is_equal (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - RX_subset s = b[0]; - b[0] = ~a[0]; - - for (x = rx_bitset_numb_subsets(size) - 1; a[x] == b[x]; --x) - ; - - b[0] = s; - return !x && s == a[0]; -} - -#ifdef __STDC__ -RX_DECL int -rx_bitset_is_subset (int size, rx_Bitset a, rx_Bitset b) -#else -RX_DECL int -rx_bitset_is_subset (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x = rx_bitset_numb_subsets(size) - 1; - while (x-- && (a[x] & b[x]) == a[x]); - return x == -1; -} - - -#ifdef __STDC__ -RX_DECL int -rx_bitset_empty (int size, rx_Bitset set) -#else -RX_DECL int -rx_bitset_empty (size, set) - int size; - rx_Bitset set; -#endif -{ - int x; - RX_subset s = set[0]; - set[0] = 1; - for (x = rx_bitset_numb_subsets(size) - 1; !set[x]; --x) - ; - set[0] = s; - return !s; -} - -#ifdef __STDC__ -RX_DECL void -rx_bitset_null (int size, rx_Bitset b) -#else -RX_DECL void -rx_bitset_null (size, b) - int size; - rx_Bitset b; -#endif -{ - bzero (b, rx_sizeof_bitset(size)); -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_universe (int size, rx_Bitset b) -#else -RX_DECL void -rx_bitset_universe (size, b) - int size; - rx_Bitset b; -#endif -{ - int x = rx_bitset_numb_subsets (size); - while (x--) - *b++ = ~(RX_subset)0; -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_complement (int size, rx_Bitset b) -#else -RX_DECL void -rx_bitset_complement (size, b) - int size; - rx_Bitset b; -#endif -{ - int x = rx_bitset_numb_subsets (size); - while (x--) - { - *b = ~*b; - ++b; - } -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_assign (int size, rx_Bitset a, rx_Bitset b) -#else -RX_DECL void -rx_bitset_assign (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x) - a[x] = b[x]; -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_union (int size, rx_Bitset a, rx_Bitset b) -#else -RX_DECL void -rx_bitset_union (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x) - a[x] |= b[x]; -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_intersection (int size, - rx_Bitset a, rx_Bitset b) -#else -RX_DECL void -rx_bitset_intersection (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x) - a[x] &= b[x]; -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_difference (int size, rx_Bitset a, rx_Bitset b) -#else -RX_DECL void -rx_bitset_difference (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x) - a[x] &= ~ b[x]; -} - - -#ifdef __STDC__ -RX_DECL void -rx_bitset_revdifference (int size, - rx_Bitset a, rx_Bitset b) -#else -RX_DECL void -rx_bitset_revdifference (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x) - a[x] = ~a[x] & b[x]; -} - -#ifdef __STDC__ -RX_DECL void -rx_bitset_xor (int size, rx_Bitset a, rx_Bitset b) -#else -RX_DECL void -rx_bitset_xor (size, a, b) - int size; - rx_Bitset a; - rx_Bitset b; -#endif -{ - int x; - for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x) - a[x] ^= b[x]; -} - - -#ifdef __STDC__ -RX_DECL unsigned long -rx_bitset_hash (int size, rx_Bitset b) -#else -RX_DECL unsigned long -rx_bitset_hash (size, b) - int size; - rx_Bitset b; -#endif -{ - int x; - unsigned long hash = (unsigned long)rx_bitset_hash; - - for (x = rx_bitset_numb_subsets(size) - 1; x >= 0; --x) - hash ^= rx_bitset_subset_val(b, x); - - return hash; -} - - -RX_DECL RX_subset rx_subset_singletons [RX_subset_bits] = -{ - 0x1, - 0x2, - 0x4, - 0x8, - 0x10, - 0x20, - 0x40, - 0x80, - 0x100, - 0x200, - 0x400, - 0x800, - 0x1000, - 0x2000, - 0x4000, - 0x8000, - 0x10000, - 0x20000, - 0x40000, - 0x80000, - 0x100000, - 0x200000, - 0x400000, - 0x800000, - 0x1000000, - 0x2000000, - 0x4000000, - 0x8000000, - 0x10000000, - 0x20000000, - 0x40000000, - 0x80000000 -}; - -#ifdef RX_DEBUG - -#ifdef __STDC__ -static void -print_cset (struct rx *rx, rx_Bitset cset, FILE * fp) -#else -static void -print_cset (rx, cset, fp) - struct rx *rx; - rx_Bitset cset; - FILE * fp; -#endif -{ - int x; - fputc ('[', fp); - for (x = 0; x < rx->local_cset_size; ++x) - if (RX_bitset_member (cset, x)) - { - if (isprint(x)) - fputc (x, fp); - else - fprintf (fp, "\\0%o ", x); - } - fputc (']', fp); -} - -#endif /* RX_DEBUG */ - - - -static unsigned long rx_hash_masks[4] = -{ - 0x12488421, - 0x96699669, - 0xbe7dd7eb, - 0xffffffff -}; - - -/* Hash tables */ -#ifdef __STDC__ -RX_DECL struct rx_hash_item * -rx_hash_find (struct rx_hash * table, - unsigned long hash, - void * value, - struct rx_hash_rules * rules) -#else -RX_DECL struct rx_hash_item * -rx_hash_find (table, hash, value, rules) - struct rx_hash * table; - unsigned long hash; - void * value; - struct rx_hash_rules * rules; -#endif -{ - rx_hash_eq eq = rules->eq; - int maskc = 0; - long mask = rx_hash_masks [0]; - int bucket = (hash & mask) % 13; - - while (table->children [bucket]) - { - table = table->children [bucket]; - ++maskc; - mask = rx_hash_masks[maskc]; - bucket = (hash & mask) % 13; - } - - { - struct rx_hash_item * it = table->buckets[bucket]; - while (it) - if (eq (it->data, value)) - return it; - else - it = it->next_same_hash; - } - - return 0; -} - - -#ifdef __STDC__ -RX_DECL struct rx_hash_item * -rx_hash_store (struct rx_hash * table, - unsigned long hash, - void * value, - struct rx_hash_rules * rules) -#else -RX_DECL struct rx_hash_item * -rx_hash_store (table, hash, value, rules) - struct rx_hash * table; - unsigned long hash; - void * value; - struct rx_hash_rules * rules; -#endif -{ - rx_hash_eq eq = rules->eq; - int maskc = 0; - long mask = rx_hash_masks[0]; - int bucket = (hash & mask) % 13; - int depth = 0; - - while (table->children [bucket]) - { - table = table->children [bucket]; - ++maskc; - mask = rx_hash_masks[maskc]; - bucket = (hash & mask) % 13; - ++depth; - } - - { - struct rx_hash_item * it = table->buckets[bucket]; - while (it) - if (eq (it->data, value)) - return it; - else - it = it->next_same_hash; - } - - { - if ( (depth < 3) - && (table->bucket_size [bucket] >= 4)) - { - struct rx_hash * newtab = ((struct rx_hash *) - rules->hash_alloc (rules)); - if (!newtab) - goto add_to_bucket; - bzero (newtab, sizeof (*newtab)); - newtab->parent = table; - { - struct rx_hash_item * them = table->buckets[bucket]; - unsigned long newmask = rx_hash_masks[maskc + 1]; - while (them) - { - struct rx_hash_item * save = them->next_same_hash; - int new_buck = (them->hash & newmask) % 13; - them->next_same_hash = newtab->buckets[new_buck]; - newtab->buckets[new_buck] = them; - them->table = newtab; - them = save; - ++newtab->bucket_size[new_buck]; - ++newtab->refs; - } - table->refs = (table->refs - table->bucket_size[bucket] + 1); - table->bucket_size[bucket] = 0; - table->buckets[bucket] = 0; - table->children[bucket] = newtab; - table = newtab; - bucket = (hash & newmask) % 13; - } - } - } - add_to_bucket: - { - struct rx_hash_item * it = ((struct rx_hash_item *) - rules->hash_item_alloc (rules, value)); - if (!it) - return 0; - it->hash = hash; - it->table = table; - /* DATA and BINDING are to be set in hash_item_alloc */ - it->next_same_hash = table->buckets [bucket]; - table->buckets[bucket] = it; - ++table->bucket_size [bucket]; - ++table->refs; - return it; - } -} - - -#ifdef __STDC__ -RX_DECL void -rx_hash_free (struct rx_hash_item * it, struct rx_hash_rules * rules) -#else -RX_DECL void -rx_hash_free (it, rules) - struct rx_hash_item * it; - struct rx_hash_rules * rules; -#endif -{ - if (it) - { - struct rx_hash * table = it->table; - unsigned long hash = it->hash; - int depth = (table->parent - ? (table->parent->parent - ? (table->parent->parent->parent - ? 3 - : 2) - : 1) - : 0); - int bucket = (hash & rx_hash_masks [depth]) % 13; - struct rx_hash_item ** pos = &table->buckets [bucket]; - - while (*pos != it) - pos = &(*pos)->next_same_hash; - *pos = it->next_same_hash; - rules->free_hash_item (it, rules); - --table->bucket_size[bucket]; - --table->refs; - while (!table->refs && depth) - { - struct rx_hash * save = table; - table = table->parent; - --depth; - bucket = (hash & rx_hash_masks [depth]) % 13; - --table->refs; - table->children[bucket] = 0; - rules->free_hash (save, rules); - } - } -} - -#ifdef __STDC__ -RX_DECL void -rx_free_hash_table (struct rx_hash * tab, rx_hash_freefn freefn, - struct rx_hash_rules * rules) -#else -RX_DECL void -rx_free_hash_table (tab, freefn, rules) - struct rx_hash * tab; - rx_hash_freefn freefn; - struct rx_hash_rules * rules; -#endif -{ - int x; - - for (x = 0; x < 13; ++x) - if (tab->children[x]) - { - rx_free_hash_table (tab->children[x], freefn, rules); - rules->free_hash (tab->children[x], rules); - } - else - { - struct rx_hash_item * them = tab->buckets[x]; - while (them) - { - struct rx_hash_item * that = them; - them = that->next_same_hash; - freefn (that); - rules->free_hash_item (that, rules); - } - } -} - - - -/* Utilities for manipulating bitset represntations of characters sets. */ - -#ifdef __STDC__ -RX_DECL rx_Bitset -rx_cset (struct rx *rx) -#else -RX_DECL rx_Bitset -rx_cset (rx) - struct rx *rx; -#endif -{ - rx_Bitset b = (rx_Bitset) malloc (rx_sizeof_bitset (rx->local_cset_size)); - if (b) - rx_bitset_null (rx->local_cset_size, b); - return b; -} - - -#ifdef __STDC__ -RX_DECL rx_Bitset -rx_copy_cset (struct rx *rx, rx_Bitset a) -#else -RX_DECL rx_Bitset -rx_copy_cset (rx, a) - struct rx *rx; - rx_Bitset a; -#endif -{ - rx_Bitset cs = rx_cset (rx); - - if (cs) - rx_bitset_union (rx->local_cset_size, cs, a); - - return cs; -} - - -#ifdef __STDC__ -RX_DECL void -rx_free_cset (struct rx * rx, rx_Bitset c) -#else -RX_DECL void -rx_free_cset (rx, c) - struct rx * rx; - rx_Bitset c; -#endif -{ - if (c) - free ((char *)c); -} - - -/* Hash table memory allocation policy for the regexp compiler */ - -#ifdef __STDC__ -static struct rx_hash * -compiler_hash_alloc (struct rx_hash_rules * rules) -#else -static struct rx_hash * -compiler_hash_alloc (rules) - struct rx_hash_rules * rules; -#endif -{ - return (struct rx_hash *)malloc (sizeof (struct rx_hash)); -} - - -#ifdef __STDC__ -static struct rx_hash_item * -compiler_hash_item_alloc (struct rx_hash_rules * rules, void * value) -#else -static struct rx_hash_item * -compiler_hash_item_alloc (rules, value) - struct rx_hash_rules * rules; - void * value; -#endif -{ - struct rx_hash_item * it; - it = (struct rx_hash_item *)malloc (sizeof (*it)); - if (it) - { - it->data = value; - it->binding = 0; - } - return it; -} - - -#ifdef __STDC__ -static void -compiler_free_hash (struct rx_hash * tab, - struct rx_hash_rules * rules) -#else -static void -compiler_free_hash (tab, rules) - struct rx_hash * tab; - struct rx_hash_rules * rules; -#endif -{ - free ((char *)tab); -} - - -#ifdef __STDC__ -static void -compiler_free_hash_item (struct rx_hash_item * item, - struct rx_hash_rules * rules) -#else -static void -compiler_free_hash_item (item, rules) - struct rx_hash_item * item; - struct rx_hash_rules * rules; -#endif -{ - free ((char *)item); -} - - -/* This page: REXP_NODE (expression tree) structures. */ - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rexp_node (struct rx *rx, - enum rexp_node_type type) -#else -RX_DECL struct rexp_node * -rexp_node (rx, type) - struct rx *rx; - enum rexp_node_type type; -#endif -{ - struct rexp_node *n; - - n = (struct rexp_node *)malloc (sizeof (*n)); - bzero (n, sizeof (*n)); - if (n) - n->type = type; - return n; -} - - -/* free_rexp_node assumes that the bitset passed to rx_mk_r_cset - * can be freed using rx_free_cset. - */ -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_cset (struct rx * rx, - rx_Bitset b) -#else -RX_DECL struct rexp_node * -rx_mk_r_cset (rx, b) - struct rx * rx; - rx_Bitset b; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_cset); - if (n) - n->params.cset = b; - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_concat (struct rx * rx, - struct rexp_node * a, - struct rexp_node * b) -#else -RX_DECL struct rexp_node * -rx_mk_r_concat (rx, a, b) - struct rx * rx; - struct rexp_node * a; - struct rexp_node * b; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_concat); - if (n) - { - n->params.pair.left = a; - n->params.pair.right = b; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_alternate (struct rx * rx, - struct rexp_node * a, - struct rexp_node * b) -#else -RX_DECL struct rexp_node * -rx_mk_r_alternate (rx, a, b) - struct rx * rx; - struct rexp_node * a; - struct rexp_node * b; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_alternate); - if (n) - { - n->params.pair.left = a; - n->params.pair.right = b; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_opt (struct rx * rx, - struct rexp_node * a) -#else -RX_DECL struct rexp_node * -rx_mk_r_opt (rx, a) - struct rx * rx; - struct rexp_node * a; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_opt); - if (n) - { - n->params.pair.left = a; - n->params.pair.right = 0; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_star (struct rx * rx, - struct rexp_node * a) -#else -RX_DECL struct rexp_node * -rx_mk_r_star (rx, a) - struct rx * rx; - struct rexp_node * a; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_star); - if (n) - { - n->params.pair.left = a; - n->params.pair.right = 0; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_2phase_star (struct rx * rx, - struct rexp_node * a, - struct rexp_node * b) -#else -RX_DECL struct rexp_node * -rx_mk_r_2phase_star (rx, a, b) - struct rx * rx; - struct rexp_node * a; - struct rexp_node * b; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_2phase_star); - if (n) - { - n->params.pair.left = a; - n->params.pair.right = b; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_side_effect (struct rx * rx, - rx_side_effect a) -#else -RX_DECL struct rexp_node * -rx_mk_r_side_effect (rx, a) - struct rx * rx; - rx_side_effect a; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_side_effect); - if (n) - { - n->params.side_effect = a; - n->params.pair.right = 0; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_mk_r_data (struct rx * rx, - void * a) -#else -RX_DECL struct rexp_node * -rx_mk_r_data (rx, a) - struct rx * rx; - void * a; -#endif -{ - struct rexp_node * n = rexp_node (rx, r_data); - if (n) - { - n->params.pair.left = a; - n->params.pair.right = 0; - } - return n; -} - - -#ifdef __STDC__ -RX_DECL void -rx_free_rexp (struct rx * rx, struct rexp_node * node) -#else -RX_DECL void -rx_free_rexp (rx, node) - struct rx * rx; - struct rexp_node * node; -#endif -{ - if (node) - { - switch (node->type) - { - case r_cset: - if (node->params.cset) - rx_free_cset (rx, node->params.cset); - - case r_side_effect: - break; - - case r_concat: - case r_alternate: - case r_2phase_star: - case r_opt: - case r_star: - rx_free_rexp (rx, node->params.pair.left); - rx_free_rexp (rx, node->params.pair.right); - break; - - case r_data: - /* This shouldn't occur. */ - break; - } - free ((char *)node); - } -} - - -#ifdef __STDC__ -RX_DECL struct rexp_node * -rx_copy_rexp (struct rx *rx, - struct rexp_node *node) -#else -RX_DECL struct rexp_node * -rx_copy_rexp (rx, node) - struct rx *rx; - struct rexp_node *node; -#endif -{ - if (!node) - return 0; - else - { - struct rexp_node *n = rexp_node (rx, node->type); - if (!n) - return 0; - switch (node->type) - { - case r_cset: - n->params.cset = rx_copy_cset (rx, node->params.cset); - if (!n->params.cset) - { - rx_free_rexp (rx, n); - return 0; - } - break; - - case r_side_effect: - n->params.side_effect = node->params.side_effect; - break; - - case r_concat: - case r_alternate: - case r_opt: - case r_2phase_star: - case r_star: - n->params.pair.left = - rx_copy_rexp (rx, node->params.pair.left); - n->params.pair.right = - rx_copy_rexp (rx, node->params.pair.right); - if ( (node->params.pair.left && !n->params.pair.left) - || (node->params.pair.right && !n->params.pair.right)) - { - rx_free_rexp (rx, n); - return 0; - } - break; - case r_data: - /* shouldn't happen */ - break; - } - return n; - } -} - - - -/* This page: functions to build and destroy graphs that describe nfa's */ - -/* Constructs a new nfa node. */ -#ifdef __STDC__ -RX_DECL struct rx_nfa_state * -rx_nfa_state (struct rx *rx) -#else -RX_DECL struct rx_nfa_state * -rx_nfa_state (rx) - struct rx *rx; -#endif -{ - struct rx_nfa_state * n = (struct rx_nfa_state *)malloc (sizeof (*n)); - if (!n) - return 0; - bzero (n, sizeof (*n)); - n->next = rx->nfa_states; - rx->nfa_states = n; - return n; -} - - -#ifdef __STDC__ -RX_DECL void -rx_free_nfa_state (struct rx_nfa_state * n) -#else -RX_DECL void -rx_free_nfa_state (n) - struct rx_nfa_state * n; -#endif -{ - free ((char *)n); -} - - -/* This looks up an nfa node, given a numeric id. Numeric id's are - * assigned after the nfa has been built. - */ -#ifdef __STDC__ -RX_DECL struct rx_nfa_state * -rx_id_to_nfa_state (struct rx * rx, - int id) -#else -RX_DECL struct rx_nfa_state * -rx_id_to_nfa_state (rx, id) - struct rx * rx; - int id; -#endif -{ - struct rx_nfa_state * n; - for (n = rx->nfa_states; n; n = n->next) - if (n->id == id) - return n; - return 0; -} - - -/* This adds an edge between two nodes, but doesn't initialize the - * edge label. - */ - -#ifdef __STDC__ -RX_DECL struct rx_nfa_edge * -rx_nfa_edge (struct rx *rx, - enum rx_nfa_etype type, - struct rx_nfa_state *start, - struct rx_nfa_state *dest) -#else -RX_DECL struct rx_nfa_edge * -rx_nfa_edge (rx, type, start, dest) - struct rx *rx; - enum rx_nfa_etype type; - struct rx_nfa_state *start; - struct rx_nfa_state *dest; -#endif -{ - struct rx_nfa_edge *e; - e = (struct rx_nfa_edge *)malloc (sizeof (*e)); - if (!e) - return 0; - e->next = start->edges; - start->edges = e; - e->type = type; - e->dest = dest; - return e; -} - - -#ifdef __STDC__ -RX_DECL void -rx_free_nfa_edge (struct rx_nfa_edge * e) -#else -RX_DECL void -rx_free_nfa_edge (e) - struct rx_nfa_edge * e; -#endif -{ - free ((char *)e); -} - - -/* This constructs a POSSIBLE_FUTURE, which is a kind epsilon-closure - * of an NFA. These are added to an nfa automaticly by eclose_nfa. - */ - -#ifdef __STDC__ -static struct rx_possible_future * -rx_possible_future (struct rx * rx, - struct rx_se_list * effects) -#else -static struct rx_possible_future * -rx_possible_future (rx, effects) - struct rx * rx; - struct rx_se_list * effects; -#endif -{ - struct rx_possible_future *ec; - ec = (struct rx_possible_future *) malloc (sizeof (*ec)); - if (!ec) - return 0; - ec->destset = 0; - ec->next = 0; - ec->effects = effects; - return ec; -} - - -#ifdef __STDC__ -static void -rx_free_possible_future (struct rx_possible_future * pf) -#else -static void -rx_free_possible_future (pf) - struct rx_possible_future * pf; -#endif -{ - free ((char *)pf); -} - - -#ifdef __STDC__ -RX_DECL void -rx_free_nfa (struct rx *rx) -#else -RX_DECL void -rx_free_nfa (rx) - struct rx *rx; -#endif -{ - while (rx->nfa_states) - { - while (rx->nfa_states->edges) - { - switch (rx->nfa_states->edges->type) - { - case ne_cset: - rx_free_cset (rx, rx->nfa_states->edges->params.cset); - break; - default: - break; - } - { - struct rx_nfa_edge * e; - e = rx->nfa_states->edges; - rx->nfa_states->edges = rx->nfa_states->edges->next; - rx_free_nfa_edge (e); - } - } /* while (rx->nfa_states->edges) */ - { - /* Iterate over the partial epsilon closures of rx->nfa_states */ - struct rx_possible_future * pf = rx->nfa_states->futures; - while (pf) - { - struct rx_possible_future * pft = pf; - pf = pf->next; - rx_free_possible_future (pft); - } - } - { - struct rx_nfa_state *n; - n = rx->nfa_states; - rx->nfa_states = rx->nfa_states->next; - rx_free_nfa_state (n); - } - } -} - - - -/* This page: translating a pattern expression into an nfa and doing the - * static part of the nfa->super-nfa translation. - */ - -/* This is the thompson regexp->nfa algorithm. - * It is modified to allow for `side-effect epsilons.' Those are - * edges that are taken whenever a similar epsilon edge would be, - * but which imply that some side effect occurs when the edge - * is taken. - * - * Side effects are used to model parts of the pattern langauge - * that are not regular (in the formal sense). - */ - -#ifdef __STDC__ -RX_DECL int -rx_build_nfa (struct rx *rx, - struct rexp_node *rexp, - struct rx_nfa_state **start, - struct rx_nfa_state **end) -#else -RX_DECL int -rx_build_nfa (rx, rexp, start, end) - struct rx *rx; - struct rexp_node *rexp; - struct rx_nfa_state **start; - struct rx_nfa_state **end; -#endif -{ - struct rx_nfa_edge *edge; - - /* Start & end nodes may have been allocated by the caller. */ - *start = *start ? *start : rx_nfa_state (rx); - - if (!*start) - return 0; - - if (!rexp) - { - *end = *start; - return 1; - } - - *end = *end ? *end : rx_nfa_state (rx); - - if (!*end) - { - rx_free_nfa_state (*start); - return 0; - } - - switch (rexp->type) - { - case r_data: - return 0; - - case r_cset: - edge = rx_nfa_edge (rx, ne_cset, *start, *end); - if (!edge) - return 0; - edge->params.cset = rx_copy_cset (rx, rexp->params.cset); - if (!edge->params.cset) - { - rx_free_nfa_edge (edge); - return 0; - } - return 1; - - case r_opt: - return (rx_build_nfa (rx, rexp->params.pair.left, start, end) - && rx_nfa_edge (rx, ne_epsilon, *start, *end)); - - case r_star: - { - struct rx_nfa_state * star_start = 0; - struct rx_nfa_state * star_end = 0; - return (rx_build_nfa (rx, rexp->params.pair.left, - &star_start, &star_end) - && star_start - && star_end - && rx_nfa_edge (rx, ne_epsilon, star_start, star_end) - && rx_nfa_edge (rx, ne_epsilon, *start, star_start) - && rx_nfa_edge (rx, ne_epsilon, star_end, *end) - - && rx_nfa_edge (rx, ne_epsilon, star_end, star_start)); - } - - case r_2phase_star: - { - struct rx_nfa_state * star_start = 0; - struct rx_nfa_state * star_end = 0; - struct rx_nfa_state * loop_exp_start = 0; - struct rx_nfa_state * loop_exp_end = 0; - - return (rx_build_nfa (rx, rexp->params.pair.left, - &star_start, &star_end) - && rx_build_nfa (rx, rexp->params.pair.right, - &loop_exp_start, &loop_exp_end) - && star_start - && star_end - && loop_exp_end - && loop_exp_start - && rx_nfa_edge (rx, ne_epsilon, star_start, *end) - && rx_nfa_edge (rx, ne_epsilon, *start, star_start) - && rx_nfa_edge (rx, ne_epsilon, star_end, *end) - - && rx_nfa_edge (rx, ne_epsilon, star_end, loop_exp_start) - && rx_nfa_edge (rx, ne_epsilon, loop_exp_end, star_start)); - } - - - case r_concat: - { - struct rx_nfa_state *shared = 0; - return - (rx_build_nfa (rx, rexp->params.pair.left, start, &shared) - && rx_build_nfa (rx, rexp->params.pair.right, &shared, end)); - } - - case r_alternate: - { - struct rx_nfa_state *ls = 0; - struct rx_nfa_state *le = 0; - struct rx_nfa_state *rs = 0; - struct rx_nfa_state *re = 0; - return (rx_build_nfa (rx, rexp->params.pair.left, &ls, &le) - && rx_build_nfa (rx, rexp->params.pair.right, &rs, &re) - && rx_nfa_edge (rx, ne_epsilon, *start, ls) - && rx_nfa_edge (rx, ne_epsilon, *start, rs) - && rx_nfa_edge (rx, ne_epsilon, le, *end) - && rx_nfa_edge (rx, ne_epsilon, re, *end)); - } - - case r_side_effect: - edge = rx_nfa_edge (rx, ne_side_effect, *start, *end); - if (!edge) - return 0; - edge->params.side_effect = rexp->params.side_effect; - return 1; - } - - /* this should never happen */ - return 0; -} - - -/* RX_NAME_NFA_STATES identifies all nodes with outgoing non-epsilon - * transitions. Only these nodes can occur in super-states. - * All nodes are given an integer id. - * The id is non-negative if the node has non-epsilon out-transitions, negative - * otherwise (this is because we want the non-negative ids to be used as - * array indexes in a few places). - */ - -#ifdef __STDC__ -RX_DECL void -rx_name_nfa_states (struct rx *rx) -#else -RX_DECL void -rx_name_nfa_states (rx) - struct rx *rx; -#endif -{ - struct rx_nfa_state *n = rx->nfa_states; - - rx->nodec = 0; - rx->epsnodec = -1; - - while (n) - { - struct rx_nfa_edge *e = n->edges; - - if (n->is_start) - n->eclosure_needed = 1; - - while (e) - { - switch (e->type) - { - case ne_epsilon: - case ne_side_effect: - break; - - case ne_cset: - n->id = rx->nodec++; - { - struct rx_nfa_edge *from_n = n->edges; - while (from_n) - { - from_n->dest->eclosure_needed = 1; - from_n = from_n->next; - } - } - goto cont; - } - e = e->next; - } - n->id = rx->epsnodec--; - cont: - n = n->next; - } - rx->epsnodec = -rx->epsnodec; -} - - -/* This page: data structures for the static part of the nfa->supernfa - * translation. - * - * There are side effect lists -- lists of side effects occuring - * along an uninterrupted, acyclic path of side-effect epsilon edges. - * Such paths are collapsed to single edges in the course of computing - * epsilon closures. Such single edges are labled with a list of all - * the side effects entailed in crossing them. Like lists of side - * effects are made == by the constructors below. - * - * There are also nfa state sets. These are used to hold a list of all - * states reachable from a starting state for a given type of transition - * and side effect list. These are also hash-consed. - */ - -/* The next several functions compare, construct, etc. lists of side - * effects. See ECLOSE_NFA (below) for details. - */ - -/* Ordering of rx_se_list - * (-1, 0, 1 return value convention). - */ - -#ifdef __STDC__ -static int -se_list_cmp (void * va, void * vb) -#else -static int -se_list_cmp (va, vb) - void * va; - void * vb; -#endif -{ - struct rx_se_list * a = (struct rx_se_list *)va; - struct rx_se_list * b = (struct rx_se_list *)vb; - - return ((va == vb) - ? 0 - : (!va - ? -1 - : (!vb - ? 1 - : ((long)a->car < (long)b->car - ? 1 - : ((long)a->car > (long)b->car - ? -1 - : se_list_cmp ((void *)a->cdr, (void *)b->cdr)))))); -} - - -#ifdef __STDC__ -static int -se_list_equal (void * va, void * vb) -#else -static int -se_list_equal (va, vb) - void * va; - void * vb; -#endif -{ - return !(se_list_cmp (va, vb)); -} - -static struct rx_hash_rules se_list_hash_rules = -{ - se_list_equal, - compiler_hash_alloc, - compiler_free_hash, - compiler_hash_item_alloc, - compiler_free_hash_item -}; - - -#ifdef __STDC__ -static struct rx_se_list * -side_effect_cons (struct rx * rx, - void * se, struct rx_se_list * list) -#else -static struct rx_se_list * -side_effect_cons (rx, se, list) - struct rx * rx; - void * se; - struct rx_se_list * list; -#endif -{ - struct rx_se_list * l; - l = ((struct rx_se_list *) malloc (sizeof (*l))); - if (!l) - return 0; - l->car = se; - l->cdr = list; - return l; -} - - -#ifdef __STDC__ -static struct rx_se_list * -hash_cons_se_prog (struct rx * rx, - struct rx_hash * memo, - void * car, struct rx_se_list * cdr) -#else -static struct rx_se_list * -hash_cons_se_prog (rx, memo, car, cdr) - struct rx * rx; - struct rx_hash * memo; - void * car; - struct rx_se_list * cdr; -#endif -{ - long hash = (long)car ^ (long)cdr; - struct rx_se_list template; - - template.car = car; - template.cdr = cdr; - { - struct rx_hash_item * it = rx_hash_store (memo, hash, - (void *)&template, - &se_list_hash_rules); - if (!it) - return 0; - if (it->data == (void *)&template) - { - struct rx_se_list * consed; - consed = (struct rx_se_list *) malloc (sizeof (*consed)); - *consed = template; - it->data = (void *)consed; - } - return (struct rx_se_list *)it->data; - } -} - - -#ifdef __STDC__ -static struct rx_se_list * -hash_se_prog (struct rx * rx, struct rx_hash * memo, struct rx_se_list * prog) -#else -static struct rx_se_list * -hash_se_prog (rx, memo, prog) - struct rx * rx; - struct rx_hash * memo; - struct rx_se_list * prog; -#endif -{ - struct rx_se_list * answer = 0; - while (prog) - { - answer = hash_cons_se_prog (rx, memo, prog->car, answer); - if (!answer) - return 0; - prog = prog->cdr; - } - return answer; -} - -#ifdef __STDC__ -static int -nfa_set_cmp (void * va, void * vb) -#else -static int -nfa_set_cmp (va, vb) - void * va; - void * vb; -#endif -{ - struct rx_nfa_state_set * a = (struct rx_nfa_state_set *)va; - struct rx_nfa_state_set * b = (struct rx_nfa_state_set *)vb; - - return ((va == vb) - ? 0 - : (!va - ? -1 - : (!vb - ? 1 - : (a->car->id < b->car->id - ? 1 - : (a->car->id > b->car->id - ? -1 - : nfa_set_cmp ((void *)a->cdr, (void *)b->cdr)))))); -} - -#ifdef __STDC__ -static int -nfa_set_equal (void * va, void * vb) -#else -static int -nfa_set_equal (va, vb) - void * va; - void * vb; -#endif -{ - return !nfa_set_cmp (va, vb); -} - -static struct rx_hash_rules nfa_set_hash_rules = -{ - nfa_set_equal, - compiler_hash_alloc, - compiler_free_hash, - compiler_hash_item_alloc, - compiler_free_hash_item -}; - - -#ifdef __STDC__ -static struct rx_nfa_state_set * -nfa_set_cons (struct rx * rx, - struct rx_hash * memo, struct rx_nfa_state * state, - struct rx_nfa_state_set * set) -#else -static struct rx_nfa_state_set * -nfa_set_cons (rx, memo, state, set) - struct rx * rx; - struct rx_hash * memo; - struct rx_nfa_state * state; - struct rx_nfa_state_set * set; -#endif -{ - struct rx_nfa_state_set template; - struct rx_hash_item * node; - template.car = state; - template.cdr = set; - node = rx_hash_store (memo, - (((long)state) >> 8) ^ (long)set, - &template, &nfa_set_hash_rules); - if (!node) - return 0; - if (node->data == &template) - { - struct rx_nfa_state_set * l; - l = (struct rx_nfa_state_set *) malloc (sizeof (*l)); - node->data = (void *) l; - if (!l) - return 0; - *l = template; - } - return (struct rx_nfa_state_set *)node->data; -} - - -#ifdef __STDC__ -static struct rx_nfa_state_set * -nfa_set_enjoin (struct rx * rx, - struct rx_hash * memo, struct rx_nfa_state * state, - struct rx_nfa_state_set * set) -#else -static struct rx_nfa_state_set * -nfa_set_enjoin (rx, memo, state, set) - struct rx * rx; - struct rx_hash * memo; - struct rx_nfa_state * state; - struct rx_nfa_state_set * set; -#endif -{ - if (!set || state->id < set->car->id) - return nfa_set_cons (rx, memo, state, set); - if (state->id == set->car->id) - return set; - else - { - struct rx_nfa_state_set * newcdr - = nfa_set_enjoin (rx, memo, state, set->cdr); - if (newcdr != set->cdr) - set = nfa_set_cons (rx, memo, set->car, newcdr); - return set; - } -} - - - -/* This page: computing epsilon closures. The closures aren't total. - * Each node's closures are partitioned according to the side effects entailed - * along the epsilon edges. Return true on success. - */ - -struct eclose_frame -{ - struct rx_se_list *prog_backwards; -}; - - -#ifdef __STDC__ -static int -eclose_node (struct rx *rx, struct rx_nfa_state *outnode, - struct rx_nfa_state *node, struct eclose_frame *frame) -#else -static int -eclose_node (rx, outnode, node, frame) - struct rx *rx; - struct rx_nfa_state *outnode; - struct rx_nfa_state *node; - struct eclose_frame *frame; -#endif -{ - struct rx_nfa_edge *e = node->edges; - - /* For each node, we follow all epsilon paths to build the closure. - * The closure omits nodes that have only epsilon edges. - * The closure is split into partial closures -- all the states in - * a partial closure are reached by crossing the same list of - * of side effects (though not necessarily the same path). - */ - if (node->mark) - return 1; - node->mark = 1; - - if (node->id >= 0 || node->is_final) - { - struct rx_possible_future **ec; - struct rx_se_list * prog_in_order - = ((struct rx_se_list *)hash_se_prog (rx, - &rx->se_list_memo, - frame->prog_backwards)); - int cmp; - - ec = &outnode->futures; - - while (*ec) - { - cmp = se_list_cmp ((void *)(*ec)->effects, (void *)prog_in_order); - if (cmp <= 0) - break; - ec = &(*ec)->next; - } - if (!*ec || (cmp < 0)) - { - struct rx_possible_future * saved = *ec; - *ec = rx_possible_future (rx, prog_in_order); - (*ec)->next = saved; - if (!*ec) - return 0; - } - if (node->id >= 0) - { - (*ec)->destset = nfa_set_enjoin (rx, &rx->set_list_memo, - node, (*ec)->destset); - if (!(*ec)->destset) - return 0; - } - } - - while (e) - { - switch (e->type) - { - case ne_epsilon: - if (!eclose_node (rx, outnode, e->dest, frame)) - return 0; - break; - case ne_side_effect: - { - frame->prog_backwards = side_effect_cons (rx, - e->params.side_effect, - frame->prog_backwards); - if (!frame->prog_backwards) - return 0; - if (!eclose_node (rx, outnode, e->dest, frame)) - return 0; - { - struct rx_se_list * dying = frame->prog_backwards; - frame->prog_backwards = frame->prog_backwards->cdr; - free ((char *)dying); - } - break; - } - default: - break; - } - e = e->next; - } - node->mark = 0; - return 1; -} - - -#ifdef __STDC__ -RX_DECL int -rx_eclose_nfa (struct rx *rx) -#else -RX_DECL int -rx_eclose_nfa (rx) - struct rx *rx; -#endif -{ - struct rx_nfa_state *n = rx->nfa_states; - struct eclose_frame frame; - static int rx_id = 0; - - frame.prog_backwards = 0; - rx->rx_id = rx_id++; - bzero (&rx->se_list_memo, sizeof (rx->se_list_memo)); - bzero (&rx->set_list_memo, sizeof (rx->set_list_memo)); - while (n) - { - n->futures = 0; - if (n->eclosure_needed && !eclose_node (rx, n, n, &frame)) - return 0; - /* clear_marks (rx); */ - n = n->next; - } - return 1; -} - - -/* This deletes epsilon edges from an NFA. After running eclose_node, - * we have no more need for these edges. They are removed to simplify - * further operations on the NFA. - */ - -#ifdef __STDC__ -RX_DECL void -rx_delete_epsilon_transitions (struct rx *rx) -#else -RX_DECL void -rx_delete_epsilon_transitions (rx) - struct rx *rx; -#endif -{ - struct rx_nfa_state *n = rx->nfa_states; - struct rx_nfa_edge **e; - - while (n) - { - e = &n->edges; - while (*e) - { - struct rx_nfa_edge *t; - switch ((*e)->type) - { - case ne_epsilon: - case ne_side_effect: - t = *e; - *e = t->next; - rx_free_nfa_edge (t); - break; - - default: - e = &(*e)->next; - break; - } - } - n = n->next; - } -} - - -/* This page: storing the nfa in a contiguous region of memory for - * subsequent conversion to a super-nfa. - */ - -/* This is for qsort on an array of nfa_states. The order - * is based on state ids and goes - * [0...MAX][MIN..-1] where (MAX>=0) and (MIN<0) - * This way, positive ids double as array indices. - */ - -#ifdef __STDC__ -static int -nfacmp (void * va, void * vb) -#else -static int -nfacmp (va, vb) - void * va; - void * vb; -#endif -{ - struct rx_nfa_state **a = (struct rx_nfa_state **)va; - struct rx_nfa_state **b = (struct rx_nfa_state **)vb; - return (*a == *b /* &&&& 3.18 */ - ? 0 - : (((*a)->id < 0) == ((*b)->id < 0) - ? (((*a)->id < (*b)->id) ? -1 : 1) - : (((*a)->id < 0) - ? 1 : -1))); -} - -#ifdef __STDC__ -static int -count_hash_nodes (struct rx_hash * st) -#else -static int -count_hash_nodes (st) - struct rx_hash * st; -#endif -{ - int x; - int count = 0; - for (x = 0; x < 13; ++x) - count += ((st->children[x]) - ? count_hash_nodes (st->children[x]) - : st->bucket_size[x]); - - return count; -} - - -#ifdef __STDC__ -static void -se_memo_freer (struct rx_hash_item * node) -#else -static void -se_memo_freer (node) - struct rx_hash_item * node; -#endif -{ - free ((char *)node->data); -} - - -#ifdef __STDC__ -static void -nfa_set_freer (struct rx_hash_item * node) -#else -static void -nfa_set_freer (node) - struct rx_hash_item * node; -#endif -{ - free ((char *)node->data); -} - - -/* This copies an entire NFA into a single malloced block of memory. - * Mostly this is for compatability with regex.c, though it is convenient - * to have the nfa nodes in an array. - */ - -#ifdef __STDC__ -RX_DECL int -rx_compactify_nfa (struct rx *rx, - void **mem, unsigned long *size) -#else -RX_DECL int -rx_compactify_nfa (rx, mem, size) - struct rx *rx; - void **mem; - unsigned long *size; -#endif -{ - int total_nodec; - struct rx_nfa_state *n; - int edgec = 0; - int eclosec = 0; - int se_list_consc = count_hash_nodes (&rx->se_list_memo); - int nfa_setc = count_hash_nodes (&rx->set_list_memo); - unsigned long total_size; - - /* This takes place in two stages. First, the total size of the - * nfa is computed, then structures are copied. - */ - n = rx->nfa_states; - total_nodec = 0; - while (n) - { - struct rx_nfa_edge *e = n->edges; - struct rx_possible_future *ec = n->futures; - ++total_nodec; - while (e) - { - ++edgec; - e = e->next; - } - while (ec) - { - ++eclosec; - ec = ec->next; - } - n = n->next; - } - - total_size = (total_nodec * sizeof (struct rx_nfa_state) - + edgec * rx_sizeof_bitset (rx->local_cset_size) - + edgec * sizeof (struct rx_nfa_edge) - + nfa_setc * sizeof (struct rx_nfa_state_set) - + eclosec * sizeof (struct rx_possible_future) - + se_list_consc * sizeof (struct rx_se_list) - + rx->reserved); - - if (total_size > *size) - { - *mem = remalloc (*mem, total_size); - if (*mem) - *size = total_size; - else - return 0; - } - /* Now we've allocated the memory; this copies the NFA. */ - { - static struct rx_nfa_state **scratch = 0; - static int scratch_alloc = 0; - struct rx_nfa_state *state_base = (struct rx_nfa_state *) * mem; - struct rx_nfa_state *new_state = state_base; - struct rx_nfa_edge *new_edge = - (struct rx_nfa_edge *) - ((char *) state_base + total_nodec * sizeof (struct rx_nfa_state)); - struct rx_se_list * new_se_list = - (struct rx_se_list *) - ((char *)new_edge + edgec * sizeof (struct rx_nfa_edge)); - struct rx_possible_future *new_close = - ((struct rx_possible_future *) - ((char *) new_se_list - + se_list_consc * sizeof (struct rx_se_list))); - struct rx_nfa_state_set * new_nfa_set = - ((struct rx_nfa_state_set *) - ((char *)new_close + eclosec * sizeof (struct rx_possible_future))); - char *new_bitset = - ((char *) new_nfa_set + nfa_setc * sizeof (struct rx_nfa_state_set)); - int x; - struct rx_nfa_state *n; - - if (scratch_alloc < total_nodec) - { - scratch = ((struct rx_nfa_state **) - remalloc (scratch, total_nodec * sizeof (*scratch))); - if (scratch) - scratch_alloc = total_nodec; - else - { - scratch_alloc = 0; - return 0; - } - } - - for (x = 0, n = rx->nfa_states; n; n = n->next) - scratch[x++] = n; - - qsort (scratch, total_nodec, - sizeof (struct rx_nfa_state *), (int (*)())nfacmp); - - for (x = 0; x < total_nodec; ++x) - { - struct rx_possible_future *eclose = scratch[x]->futures; - struct rx_nfa_edge *edge = scratch[x]->edges; - struct rx_nfa_state *cn = new_state++; - cn->futures = 0; - cn->edges = 0; - cn->next = (x == total_nodec - 1) ? 0 : (cn + 1); - cn->id = scratch[x]->id; - cn->is_final = scratch[x]->is_final; - cn->is_start = scratch[x]->is_start; - cn->mark = 0; - while (edge) - { - int indx = (edge->dest->id < 0 - ? (total_nodec + edge->dest->id) - : edge->dest->id); - struct rx_nfa_edge *e = new_edge++; - rx_Bitset cset = (rx_Bitset) new_bitset; - new_bitset += rx_sizeof_bitset (rx->local_cset_size); - rx_bitset_null (rx->local_cset_size, cset); - rx_bitset_union (rx->local_cset_size, cset, edge->params.cset); - e->next = cn->edges; - cn->edges = e; - e->type = edge->type; - e->dest = state_base + indx; - e->params.cset = cset; - edge = edge->next; - } - while (eclose) - { - struct rx_possible_future *ec = new_close++; - struct rx_hash_item * sp; - struct rx_se_list ** sepos; - struct rx_se_list * sesrc; - struct rx_nfa_state_set * destlst; - struct rx_nfa_state_set ** destpos; - ec->next = cn->futures; - cn->futures = ec; - for (sepos = &ec->effects, sesrc = eclose->effects; - sesrc; - sesrc = sesrc->cdr, sepos = &(*sepos)->cdr) - { - sp = rx_hash_find (&rx->se_list_memo, - (long)sesrc->car ^ (long)sesrc->cdr, - sesrc, &se_list_hash_rules); - if (sp->binding) - { - sesrc = (struct rx_se_list *)sp->binding; - break; - } - *new_se_list = *sesrc; - sp->binding = (void *)new_se_list; - *sepos = new_se_list; - ++new_se_list; - } - *sepos = sesrc; - for (destpos = &ec->destset, destlst = eclose->destset; - destlst; - destpos = &(*destpos)->cdr, destlst = destlst->cdr) - { - sp = rx_hash_find (&rx->set_list_memo, - ((((long)destlst->car) >> 8) - ^ (long)destlst->cdr), - destlst, &nfa_set_hash_rules); - if (sp->binding) - { - destlst = (struct rx_nfa_state_set *)sp->binding; - break; - } - *new_nfa_set = *destlst; - new_nfa_set->car = state_base + destlst->car->id; - sp->binding = (void *)new_nfa_set; - *destpos = new_nfa_set; - ++new_nfa_set; - } - *destpos = destlst; - eclose = eclose->next; - } - } - } - rx_free_hash_table (&rx->se_list_memo, se_memo_freer, &se_list_hash_rules); - bzero (&rx->se_list_memo, sizeof (rx->se_list_memo)); - rx_free_hash_table (&rx->set_list_memo, nfa_set_freer, &nfa_set_hash_rules); - bzero (&rx->set_list_memo, sizeof (rx->set_list_memo)); - - rx_free_nfa (rx); - rx->nfa_states = (struct rx_nfa_state *)*mem; - return 1; -} - - -/* The functions in the next several pages define the lazy-NFA-conversion used - * by matchers. The input to this construction is an NFA such as - * is built by compactify_nfa (rx.c). The output is the superNFA. - */ - -/* Match engines can use arbitrary values for opcodes. So, the parse tree - * is built using instructions names (enum rx_opcode), but the superstate - * nfa is populated with mystery opcodes (void *). - * - * For convenience, here is an id table. The opcodes are == to their inxs - * - * The lables in re_search_2 would make good values for instructions. - */ - -void * rx_id_instruction_table[rx_num_instructions] = -{ - (void *) rx_backtrack_point, - (void *) rx_do_side_effects, - (void *) rx_cache_miss, - (void *) rx_next_char, - (void *) rx_backtrack, - (void *) rx_error_inx -}; - - - -/* Memory mgt. for superstate graphs. */ - -#ifdef __STDC__ -static char * -rx_cache_malloc (struct rx_cache * cache, int bytes) -#else -static char * -rx_cache_malloc (cache, bytes) - struct rx_cache * cache; - int bytes; -#endif -{ - while (cache->bytes_left < bytes) - { - if (cache->memory_pos) - cache->memory_pos = cache->memory_pos->next; - if (!cache->memory_pos) - { - cache->morecore (cache); - if (!cache->memory_pos) - return 0; - } - cache->bytes_left = cache->memory_pos->bytes; - cache->memory_addr = ((char *)cache->memory_pos - + sizeof (struct rx_blocklist)); - } - cache->bytes_left -= bytes; - { - char * addr = cache->memory_addr; - cache->memory_addr += bytes; - return addr; - } -} - -#ifdef __STDC__ -static void -rx_cache_free (struct rx_cache * cache, - struct rx_freelist ** freelist, char * mem) -#else -static void -rx_cache_free (cache, freelist, mem) - struct rx_cache * cache; - struct rx_freelist ** freelist; - char * mem; -#endif -{ - struct rx_freelist * it = (struct rx_freelist *)mem; - it->next = *freelist; - *freelist = it; -} - - -/* The partially instantiated superstate graph has a transition - * table at every node. There is one entry for every character. - * This fills in the transition for a set. - */ -#ifdef __STDC__ -static void -install_transition (struct rx_superstate *super, - struct rx_inx *answer, rx_Bitset trcset) -#else -static void -install_transition (super, answer, trcset) - struct rx_superstate *super; - struct rx_inx *answer; - rx_Bitset trcset; -#endif -{ - struct rx_inx * transitions = super->transitions; - int chr; - for (chr = 0; chr < 256; ) - if (!*trcset) - { - ++trcset; - chr += 32; - } - else - { - RX_subset sub = *trcset; - RX_subset mask = 1; - int bound = chr + 32; - while (chr < bound) - { - if (sub & mask) - transitions [chr] = *answer; - ++chr; - mask <<= 1; - } - ++trcset; - } -} - - -#ifdef __STDC__ -static int -qlen (struct rx_superstate * q) -#else -static int -qlen (q) - struct rx_superstate * q; -#endif -{ - int count = 1; - struct rx_superstate * it; - if (!q) - return 0; - for (it = q->next_recyclable; it != q; it = it->next_recyclable) - ++count; - return count; -} - -#ifdef __STDC__ -static void -check_cache (struct rx_cache * cache) -#else -static void -check_cache (cache) - struct rx_cache * cache; -#endif -{ - struct rx_cache * you_fucked_up = 0; - int total = cache->superstates; - int semi = cache->semifree_superstates; - if (semi != qlen (cache->semifree_superstate)) - check_cache (you_fucked_up); - if ((total - semi) != qlen (cache->lru_superstate)) - check_cache (you_fucked_up); -} - -/* When a superstate is old and neglected, it can enter a - * semi-free state. A semi-free state is slated to die. - * Incoming transitions to a semi-free state are re-written - * to cause an (interpreted) fault when they are taken. - * The fault handler revives the semi-free state, patches - * incoming transitions back to normal, and continues. - * - * The idea is basicly to free in two stages, aborting - * between the two if the state turns out to be useful again. - * When a free is aborted, the rescued superstate is placed - * in the most-favored slot to maximize the time until it - * is next semi-freed. - */ - -#ifdef __STDC__ -static void -semifree_superstate (struct rx_cache * cache) -#else -static void -semifree_superstate (cache) - struct rx_cache * cache; -#endif -{ - int disqualified = cache->semifree_superstates; - if (disqualified == cache->superstates) - return; - while (cache->lru_superstate->locks) - { - cache->lru_superstate = cache->lru_superstate->next_recyclable; - ++disqualified; - if (disqualified == cache->superstates) - return; - } - { - struct rx_superstate * it = cache->lru_superstate; - it->next_recyclable->prev_recyclable = it->prev_recyclable; - it->prev_recyclable->next_recyclable = it->next_recyclable; - cache->lru_superstate = (it == it->next_recyclable - ? 0 - : it->next_recyclable); - if (!cache->semifree_superstate) - { - cache->semifree_superstate = it; - it->next_recyclable = it; - it->prev_recyclable = it; - } - else - { - it->prev_recyclable = cache->semifree_superstate->prev_recyclable; - it->next_recyclable = cache->semifree_superstate; - it->prev_recyclable->next_recyclable = it; - it->next_recyclable->prev_recyclable = it; - } - { - struct rx_distinct_future *df; - it->is_semifree = 1; - ++cache->semifree_superstates; - df = it->transition_refs; - if (df) - { - df->prev_same_dest->next_same_dest = 0; - for (df = it->transition_refs; df; df = df->next_same_dest) - { - df->future_frame.inx = cache->instruction_table[rx_cache_miss]; - df->future_frame.data = 0; - df->future_frame.data_2 = (void *) df; - /* If there are any NEXT-CHAR instruction frames that - * refer to this state, we convert them to CACHE-MISS frames. - */ - if (!df->effects - && (df->edge->options->next_same_super_edge[0] - == df->edge->options)) - install_transition (df->present, &df->future_frame, - df->edge->cset); - } - df = it->transition_refs; - df->prev_same_dest->next_same_dest = df; - } - } - } -} - - -#ifdef __STDC__ -static void -refresh_semifree_superstate (struct rx_cache * cache, - struct rx_superstate * super) -#else -static void -refresh_semifree_superstate (cache, super) - struct rx_cache * cache; - struct rx_superstate * super; -#endif -{ - struct rx_distinct_future *df; - - if (super->transition_refs) - { - super->transition_refs->prev_same_dest->next_same_dest = 0; - for (df = super->transition_refs; df; df = df->next_same_dest) - { - df->future_frame.inx = cache->instruction_table[rx_next_char]; - df->future_frame.data = (void *) super->transitions; - /* CACHE-MISS instruction frames that refer to this state, - * must be converted to NEXT-CHAR frames. - */ - if (!df->effects - && (df->edge->options->next_same_super_edge[0] - == df->edge->options)) - install_transition (df->present, &df->future_frame, - df->edge->cset); - } - super->transition_refs->prev_same_dest->next_same_dest - = super->transition_refs; - } - if (cache->semifree_superstate == super) - cache->semifree_superstate = (super->prev_recyclable == super - ? 0 - : super->prev_recyclable); - super->next_recyclable->prev_recyclable = super->prev_recyclable; - super->prev_recyclable->next_recyclable = super->next_recyclable; - - if (!cache->lru_superstate) - (cache->lru_superstate - = super->next_recyclable - = super->prev_recyclable - = super); - else - { - super->next_recyclable = cache->lru_superstate; - super->prev_recyclable = cache->lru_superstate->prev_recyclable; - super->next_recyclable->prev_recyclable = super; - super->prev_recyclable->next_recyclable = super; - } - super->is_semifree = 0; - --cache->semifree_superstates; -} - -#ifdef __STDC__ -static void -rx_refresh_this_superstate (struct rx_cache * cache, struct rx_superstate * superstate) -#else -static void -rx_refresh_this_superstate (cache, superstate) - struct rx_cache * cache; - struct rx_superstate * superstate; -#endif -{ - if (superstate->is_semifree) - refresh_semifree_superstate (cache, superstate); - else if (cache->lru_superstate == superstate) - cache->lru_superstate = superstate->next_recyclable; - else if (superstate != cache->lru_superstate->prev_recyclable) - { - superstate->next_recyclable->prev_recyclable - = superstate->prev_recyclable; - superstate->prev_recyclable->next_recyclable - = superstate->next_recyclable; - superstate->next_recyclable = cache->lru_superstate; - superstate->prev_recyclable = cache->lru_superstate->prev_recyclable; - superstate->next_recyclable->prev_recyclable = superstate; - superstate->prev_recyclable->next_recyclable = superstate; - } -} - -#ifdef __STDC__ -static void -release_superset_low (struct rx_cache * cache, - struct rx_superset *set) -#else -static void -release_superset_low (cache, set) - struct rx_cache * cache; - struct rx_superset *set; -#endif -{ - if (!--set->refs) - { - if (set->cdr) - release_superset_low (cache, set->cdr); - - set->starts_for = 0; - - rx_hash_free - (rx_hash_find - (&cache->superset_table, - (unsigned long)set->car ^ set->id ^ (unsigned long)set->cdr, - (void *)set, - &cache->superset_hash_rules), - &cache->superset_hash_rules); - rx_cache_free (cache, &cache->free_supersets, (char *)set); - } -} - -#ifdef __STDC__ -RX_DECL void -rx_release_superset (struct rx *rx, - struct rx_superset *set) -#else -RX_DECL void -rx_release_superset (rx, set) - struct rx *rx; - struct rx_superset *set; -#endif -{ - release_superset_low (rx->cache, set); -} - -/* This tries to add a new superstate to the superstate freelist. - * It might, as a result, free some edge pieces or hash tables. - * If nothing can be freed because too many locks are being held, fail. - */ - -#ifdef __STDC__ -static int -rx_really_free_superstate (struct rx_cache * cache) -#else -static int -rx_really_free_superstate (cache) - struct rx_cache * cache; -#endif -{ - int locked_superstates = 0; - struct rx_superstate * it; - - if (!cache->superstates) - return 0; - - { - /* This is a total guess. The idea is that we should expect as - * many misses as we've recently experienced. I.e., cache->misses - * should be the same as cache->semifree_superstates. - */ - while ((cache->hits + cache->misses) > cache->superstates_allowed) - { - cache->hits >>= 1; - cache->misses >>= 1; - } - if ( ((cache->hits + cache->misses) * cache->semifree_superstates) - < (cache->superstates * cache->misses)) - { - semifree_superstate (cache); - semifree_superstate (cache); - } - } - - while (cache->semifree_superstate && cache->semifree_superstate->locks) - { - refresh_semifree_superstate (cache, cache->semifree_superstate); - ++locked_superstates; - if (locked_superstates == cache->superstates) - return 0; - } - - if (cache->semifree_superstate) - { - it = cache->semifree_superstate; - it->next_recyclable->prev_recyclable = it->prev_recyclable; - it->prev_recyclable->next_recyclable = it->next_recyclable; - cache->semifree_superstate = ((it == it->next_recyclable) - ? 0 - : it->next_recyclable); - --cache->semifree_superstates; - } - else - { - while (cache->lru_superstate->locks) - { - cache->lru_superstate = cache->lru_superstate->next_recyclable; - ++locked_superstates; - if (locked_superstates == cache->superstates) - return 0; - } - it = cache->lru_superstate; - it->next_recyclable->prev_recyclable = it->prev_recyclable; - it->prev_recyclable->next_recyclable = it->next_recyclable; - cache->lru_superstate = ((it == it->next_recyclable) - ? 0 - : it->next_recyclable); - } - - if (it->transition_refs) - { - struct rx_distinct_future *df; - for (df = it->transition_refs, - df->prev_same_dest->next_same_dest = 0; - df; - df = df->next_same_dest) - { - df->future_frame.inx = cache->instruction_table[rx_cache_miss]; - df->future_frame.data = 0; - df->future_frame.data_2 = (void *) df; - df->future = 0; - } - it->transition_refs->prev_same_dest->next_same_dest = - it->transition_refs; - } - { - struct rx_super_edge *tc = it->edges; - while (tc) - { - struct rx_distinct_future * df; - struct rx_super_edge *tct = tc->next; - df = tc->options; - df->next_same_super_edge[1]->next_same_super_edge[0] = 0; - while (df) - { - struct rx_distinct_future *dft = df; - df = df->next_same_super_edge[0]; - - - if (dft->future && dft->future->transition_refs == dft) - { - dft->future->transition_refs = dft->next_same_dest; - if (dft->future->transition_refs == dft) - dft->future->transition_refs = 0; - } - dft->next_same_dest->prev_same_dest = dft->prev_same_dest; - dft->prev_same_dest->next_same_dest = dft->next_same_dest; - rx_cache_free (cache, &cache->free_discernable_futures, - (char *)dft); - } - rx_cache_free (cache, &cache->free_transition_classes, (char *)tc); - tc = tct; - } - } - - if (it->contents->superstate == it) - it->contents->superstate = 0; - release_superset_low (cache, it->contents); - rx_cache_free (cache, &cache->free_superstates, (char *)it); - --cache->superstates; - return 1; -} - -#ifdef __STDC__ -static char * -rx_cache_get (struct rx_cache * cache, - struct rx_freelist ** freelist) -#else -static char * -rx_cache_get (cache, freelist) - struct rx_cache * cache; - struct rx_freelist ** freelist; -#endif -{ - while (!*freelist && rx_really_free_superstate (cache)) - ; - if (!*freelist) - return 0; - { - struct rx_freelist * it = *freelist; - *freelist = it->next; - return (char *)it; - } -} - -#ifdef __STDC__ -static char * -rx_cache_malloc_or_get (struct rx_cache * cache, - struct rx_freelist ** freelist, int bytes) -#else -static char * -rx_cache_malloc_or_get (cache, freelist, bytes) - struct rx_cache * cache; - struct rx_freelist ** freelist; - int bytes; -#endif -{ - if (!*freelist) - { - char * answer = rx_cache_malloc (cache, bytes); - if (answer) - return answer; - } - - return rx_cache_get (cache, freelist); -} - -#ifdef __STDC__ -static char * -rx_cache_get_superstate (struct rx_cache * cache) -#else -static char * -rx_cache_get_superstate (cache) - struct rx_cache * cache; -#endif -{ - char * answer; - int bytes = ( sizeof (struct rx_superstate) - + cache->local_cset_size * sizeof (struct rx_inx)); - if (!cache->free_superstates - && (cache->superstates < cache->superstates_allowed)) - { - answer = rx_cache_malloc (cache, bytes); - if (answer) - { - ++cache->superstates; - return answer; - } - } - answer = rx_cache_get (cache, &cache->free_superstates); - if (!answer) - { - answer = rx_cache_malloc (cache, bytes); - if (answer) - ++cache->superstates_allowed; - } - ++cache->superstates; - return answer; -} - - - -#ifdef __STDC__ -static int -supersetcmp (void * va, void * vb) -#else -static int -supersetcmp (va, vb) - void * va; - void * vb; -#endif -{ - struct rx_superset * a = (struct rx_superset *)va; - struct rx_superset * b = (struct rx_superset *)vb; - return ( (a == b) - || (a && b && (a->car == b->car) && (a->cdr == b->cdr))); -} - -#ifdef __STDC__ -static struct rx_hash_item * -superset_allocator (struct rx_hash_rules * rules, void * val) -#else -static struct rx_hash_item * -superset_allocator (rules, val) - struct rx_hash_rules * rules; - void * val; -#endif -{ - struct rx_cache * cache - = ((struct rx_cache *) - ((char *)rules - - (unsigned long)(&((struct rx_cache *)0)->superset_hash_rules))); - struct rx_superset * template = (struct rx_superset *)val; - struct rx_superset * newset - = ((struct rx_superset *) - rx_cache_malloc_or_get (cache, - &cache->free_supersets, - sizeof (*template))); - if (!newset) - return 0; - newset->refs = 0; - newset->car = template->car; - newset->id = template->car->id; - newset->cdr = template->cdr; - newset->superstate = 0; - rx_protect_superset (rx, template->cdr); - newset->hash_item.data = (void *)newset; - newset->hash_item.binding = 0; - return &newset->hash_item; -} - -#ifdef __STDC__ -static struct rx_hash * -super_hash_allocator (struct rx_hash_rules * rules) -#else -static struct rx_hash * -super_hash_allocator (rules) - struct rx_hash_rules * rules; -#endif -{ - struct rx_cache * cache - = ((struct rx_cache *) - ((char *)rules - - (unsigned long)(&((struct rx_cache *)0)->superset_hash_rules))); - return ((struct rx_hash *) - rx_cache_malloc_or_get (cache, - &cache->free_hash, sizeof (struct rx_hash))); -} - - -#ifdef __STDC__ -static void -super_hash_liberator (struct rx_hash * hash, struct rx_hash_rules * rules) -#else -static void -super_hash_liberator (hash, rules) - struct rx_hash * hash; - struct rx_hash_rules * rules; -#endif -{ - struct rx_cache * cache - = ((struct rx_cache *) - (char *)rules - (long)(&((struct rx_cache *)0)->superset_hash_rules)); - rx_cache_free (cache, &cache->free_hash, (char *)hash); -} - -#ifdef __STDC__ -static void -superset_hash_item_liberator (struct rx_hash_item * it, - struct rx_hash_rules * rules) -#else -static void -superset_hash_item_liberator (it, rules) /* Well, it does ya know. */ - struct rx_hash_item * it; - struct rx_hash_rules * rules; -#endif -{ -} - -int rx_cache_bound = 128; -static int rx_default_cache_got = 0; - -#ifdef __STDC__ -static int -bytes_for_cache_size (int supers, int cset_size) -#else -static int -bytes_for_cache_size (supers, cset_size) - int supers; - int cset_size; -#endif -{ - /* What the hell is this? !!!*/ - return (int) - ((float)supers * - ( (1.03 * (float) ( rx_sizeof_bitset (cset_size) - + sizeof (struct rx_super_edge))) - + (1.80 * (float) sizeof (struct rx_possible_future)) - + (float) ( sizeof (struct rx_superstate) - + cset_size * sizeof (struct rx_inx)))); -} - -#ifdef __STDC__ -static void -rx_morecore (struct rx_cache * cache) -#else -static void -rx_morecore (cache) - struct rx_cache * cache; -#endif -{ - if (rx_default_cache_got >= rx_cache_bound) - return; - - rx_default_cache_got += 16; - cache->superstates_allowed = rx_cache_bound; - { - struct rx_blocklist ** pos = &cache->memory; - int size = bytes_for_cache_size (16, cache->local_cset_size); - while (*pos) - pos = &(*pos)->next; - *pos = ((struct rx_blocklist *) - malloc (size + sizeof (struct rx_blocklist))); - if (!*pos) - return; - - (*pos)->next = 0; - (*pos)->bytes = size; - cache->memory_pos = *pos; - cache->memory_addr = (char *)*pos + sizeof (**pos); - cache->bytes_left = size; - } -} - -static struct rx_cache default_cache = -{ - { - supersetcmp, - super_hash_allocator, - super_hash_liberator, - superset_allocator, - superset_hash_item_liberator, - }, - 0, - 0, - 0, - 0, - rx_morecore, - - 0, - 0, - 0, - 0, - 0, - - 0, - 0, - - 0, - - 0, - 0, - 0, - 0, - 128, - - 256, - rx_id_instruction_table, - - { - 0, - 0, - {0}, - {0}, - {0} - } -}; - -/* This adds an element to a superstate set. These sets are lists, such - * that lists with == elements are ==. The empty set is returned by - * superset_cons (rx, 0, 0) and is NOT equivelent to - * (struct rx_superset)0. - */ - -#ifdef __STDC__ -RX_DECL struct rx_superset * -rx_superset_cons (struct rx * rx, - struct rx_nfa_state *car, struct rx_superset *cdr) -#else -RX_DECL struct rx_superset * -rx_superset_cons (rx, car, cdr) - struct rx * rx; - struct rx_nfa_state *car; - struct rx_superset *cdr; -#endif -{ - struct rx_cache * cache = rx->cache; - if (!car && !cdr) - { - if (!cache->empty_superset) - { - cache->empty_superset - = ((struct rx_superset *) - rx_cache_malloc_or_get (cache, &cache->free_supersets, - sizeof (struct rx_superset))); - if (!cache->empty_superset) - return 0; - bzero (cache->empty_superset, sizeof (struct rx_superset)); - cache->empty_superset->refs = 1000; - } - return cache->empty_superset; - } - { - struct rx_superset template; - struct rx_hash_item * hit; - template.car = car; - template.cdr = cdr; - template.id = car->id; - hit = rx_hash_store (&cache->superset_table, - (unsigned long)car ^ car->id ^ (unsigned long)cdr, - (void *)&template, - &cache->superset_hash_rules); - return (hit - ? (struct rx_superset *)hit->data - : 0); - } -} - -/* This computes a union of two NFA state sets. The sets do not have the - * same representation though. One is a RX_SUPERSET structure (part - * of the superstate NFA) and the other is an NFA_STATE_SET (part of the NFA). - */ - -#ifdef __STDC__ -RX_DECL struct rx_superset * -rx_superstate_eclosure_union - (struct rx * rx, struct rx_superset *set, struct rx_nfa_state_set *ecl) -#else -RX_DECL struct rx_superset * -rx_superstate_eclosure_union (rx, set, ecl) - struct rx * rx; - struct rx_superset *set; - struct rx_nfa_state_set *ecl; -#endif -{ - if (!ecl) - return set; - - if (!set->car) - return rx_superset_cons (rx, ecl->car, - rx_superstate_eclosure_union (rx, set, ecl->cdr)); - if (set->car == ecl->car) - return rx_superstate_eclosure_union (rx, set, ecl->cdr); - - { - struct rx_superset * tail; - struct rx_nfa_state * first; - - if (set->car > ecl->car) - { - tail = rx_superstate_eclosure_union (rx, set->cdr, ecl); - first = set->car; - } - else - { - tail = rx_superstate_eclosure_union (rx, set, ecl->cdr); - first = ecl->car; - } - if (!tail) - return 0; - else - { - struct rx_superset * answer; - answer = rx_superset_cons (rx, first, tail); - if (!answer) - { - rx_protect_superset (rx, tail); - rx_release_superset (rx, tail); - return 0; - } - else - return answer; - } - } -} - - - - -/* - * This makes sure that a list of rx_distinct_futures contains - * a future for each possible set of side effects in the eclosure - * of a given state. This is some of the work of filling in a - * superstate transition. - */ - -#ifdef __STDC__ -static struct rx_distinct_future * -include_futures (struct rx *rx, - struct rx_distinct_future *df, struct rx_nfa_state - *state, struct rx_superstate *superstate) -#else -static struct rx_distinct_future * -include_futures (rx, df, state, superstate) - struct rx *rx; - struct rx_distinct_future *df; - struct rx_nfa_state *state; - struct rx_superstate *superstate; -#endif -{ - struct rx_possible_future *future; - struct rx_cache * cache = rx->cache; - for (future = state->futures; future; future = future->next) - { - struct rx_distinct_future *dfp; - struct rx_distinct_future *insert_before = 0; - if (df) - df->next_same_super_edge[1]->next_same_super_edge[0] = 0; - for (dfp = df; dfp; dfp = dfp->next_same_super_edge[0]) - if (dfp->effects == future->effects) - break; - else - { - int order = rx->se_list_cmp (rx, dfp->effects, future->effects); - if (order > 0) - { - insert_before = dfp; - dfp = 0; - break; - } - } - if (df) - df->next_same_super_edge[1]->next_same_super_edge[0] = df; - if (!dfp) - { - dfp - = ((struct rx_distinct_future *) - rx_cache_malloc_or_get (cache, &cache->free_discernable_futures, - sizeof (struct rx_distinct_future))); - if (!dfp) - return 0; - if (!df) - { - df = insert_before = dfp; - df->next_same_super_edge[0] = df->next_same_super_edge[1] = df; - } - else if (!insert_before) - insert_before = df; - else if (insert_before == df) - df = dfp; - - dfp->next_same_super_edge[0] = insert_before; - dfp->next_same_super_edge[1] - = insert_before->next_same_super_edge[1]; - dfp->next_same_super_edge[1]->next_same_super_edge[0] = dfp; - dfp->next_same_super_edge[0]->next_same_super_edge[1] = dfp; - dfp->next_same_dest = dfp->prev_same_dest = dfp; - dfp->future = 0; - dfp->present = superstate; - dfp->future_frame.inx = rx->instruction_table[rx_cache_miss]; - dfp->future_frame.data = 0; - dfp->future_frame.data_2 = (void *) dfp; - dfp->side_effects_frame.inx - = rx->instruction_table[rx_do_side_effects]; - dfp->side_effects_frame.data = 0; - dfp->side_effects_frame.data_2 = (void *) dfp; - dfp->effects = future->effects; - } - } - return df; -} - - - -/* This constructs a new superstate from its state set. The only - * complexity here is memory management. - */ -#ifdef __STDC__ -RX_DECL struct rx_superstate * -rx_superstate (struct rx *rx, - struct rx_superset *set) -#else -RX_DECL struct rx_superstate * -rx_superstate (rx, set) - struct rx *rx; - struct rx_superset *set; -#endif -{ - struct rx_cache * cache = rx->cache; - struct rx_superstate * superstate = 0; - - /* Does the superstate already exist in the cache? */ - if (set->superstate) - { - if (set->superstate->rx_id != rx->rx_id) - { - /* Aha. It is in the cache, but belongs to a superstate - * that refers to an NFA that no longer exists. - * (We know it no longer exists because it was evidently - * stored in the same region of memory as the current nfa - * yet it has a different id.) - */ - superstate = set->superstate; - if (!superstate->is_semifree) - { - if (cache->lru_superstate == superstate) - { - cache->lru_superstate = superstate->next_recyclable; - if (cache->lru_superstate == superstate) - cache->lru_superstate = 0; - } - { - superstate->next_recyclable->prev_recyclable - = superstate->prev_recyclable; - superstate->prev_recyclable->next_recyclable - = superstate->next_recyclable; - if (!cache->semifree_superstate) - { - (cache->semifree_superstate - = superstate->next_recyclable - = superstate->prev_recyclable - = superstate); - } - else - { - superstate->next_recyclable = cache->semifree_superstate; - superstate->prev_recyclable - = cache->semifree_superstate->prev_recyclable; - superstate->next_recyclable->prev_recyclable - = superstate; - superstate->prev_recyclable->next_recyclable - = superstate; - cache->semifree_superstate = superstate; - } - ++cache->semifree_superstates; - } - } - set->superstate = 0; - goto handle_cache_miss; - } - ++cache->hits; - superstate = set->superstate; - - rx_refresh_this_superstate (cache, superstate); - return superstate; - } - - handle_cache_miss: - - /* This point reached only for cache misses. */ - ++cache->misses; -#if RX_DEBUG - if (rx_debug_trace > 1) - { - struct rx_superset * setp = set; - fprintf (stderr, "Building a superstet %d(%d): ", rx->rx_id, set); - while (setp) - { - fprintf (stderr, "%d ", setp->id); - setp = setp->cdr; - } - fprintf (stderr, "(%d)\n", set); - } -#endif - superstate = (struct rx_superstate *)rx_cache_get_superstate (cache); - if (!superstate) - return 0; - - if (!cache->lru_superstate) - (cache->lru_superstate - = superstate->next_recyclable - = superstate->prev_recyclable - = superstate); - else - { - superstate->next_recyclable = cache->lru_superstate; - superstate->prev_recyclable = cache->lru_superstate->prev_recyclable; - ( superstate->prev_recyclable->next_recyclable - = superstate->next_recyclable->prev_recyclable - = superstate); - } - superstate->rx_id = rx->rx_id; - superstate->transition_refs = 0; - superstate->locks = 0; - superstate->is_semifree = 0; - set->superstate = superstate; - superstate->contents = set; - rx_protect_superset (rx, set); - superstate->edges = 0; - { - int x; - /* None of the transitions from this superstate are known yet. */ - for (x = 0; x < rx->local_cset_size; ++x) /* &&&&& 3.8 % */ - { - struct rx_inx * ifr = &superstate->transitions[x]; - ifr->inx = rx->instruction_table [rx_cache_miss]; - ifr->data = ifr->data_2 = 0; - } - } - return superstate; -} - - -/* This computes the destination set of one edge of the superstate NFA. - * Note that a RX_DISTINCT_FUTURE is a superstate edge. - * Returns 0 on an allocation failure. - */ - -#ifdef __STDC__ -static int -solve_destination (struct rx *rx, struct rx_distinct_future *df) -#else -static int -solve_destination (rx, df) - struct rx *rx; - struct rx_distinct_future *df; -#endif -{ - struct rx_super_edge *tc = df->edge; - struct rx_superset *nfa_state; - struct rx_superset *nil_set = rx_superset_cons (rx, 0, 0); - struct rx_superset *solution = nil_set; - struct rx_superstate *dest; - - rx_protect_superset (rx, solution); - /* Iterate over all NFA states in the state set of this superstate. */ - for (nfa_state = df->present->contents; - nfa_state->car; - nfa_state = nfa_state->cdr) - { - struct rx_nfa_edge *e; - /* Iterate over all edges of each NFA state. */ - for (e = nfa_state->car->edges; e; e = e->next) - /* If we find an edge that is labeled with - * the characters we are solving for..... - */ - if (rx_bitset_is_subset (rx->local_cset_size, - tc->cset, e->params.cset)) - { - struct rx_nfa_state *n = e->dest; - struct rx_possible_future *pf; - /* ....search the partial epsilon closures of the destination - * of that edge for a path that involves the same set of - * side effects we are solving for. - * If we find such a RX_POSSIBLE_FUTURE, we add members to the - * stateset we are computing. - */ - for (pf = n->futures; pf; pf = pf->next) - if (pf->effects == df->effects) - { - struct rx_superset * old_sol; - old_sol = solution; - solution = rx_superstate_eclosure_union (rx, solution, - pf->destset); - if (!solution) - return 0; - rx_protect_superset (rx, solution); - rx_release_superset (rx, old_sol); - } - } - } - /* It is possible that the RX_DISTINCT_FUTURE we are working on has - * the empty set of NFA states as its definition. In that case, this - * is a failure point. - */ - if (solution == nil_set) - { - df->future_frame.inx = (void *) rx_backtrack; - df->future_frame.data = 0; - df->future_frame.data_2 = 0; - return 1; - } - dest = rx_superstate (rx, solution); - rx_release_superset (rx, solution); - if (!dest) - return 0; - - { - struct rx_distinct_future *dft; - dft = df; - df->prev_same_dest->next_same_dest = 0; - while (dft) - { - dft->future = dest; - dft->future_frame.inx = rx->instruction_table[rx_next_char]; - dft->future_frame.data = (void *) dest->transitions; - dft = dft->next_same_dest; - } - df->prev_same_dest->next_same_dest = df; - } - if (!dest->transition_refs) - dest->transition_refs = df; - else - { - struct rx_distinct_future *dft = dest->transition_refs->next_same_dest; - dest->transition_refs->next_same_dest = df->next_same_dest; - df->next_same_dest->prev_same_dest = dest->transition_refs; - df->next_same_dest = dft; - dft->prev_same_dest = df; - } - return 1; -} - - -/* This takes a superstate and a character, and computes some edges - * from the superstate NFA. In particular, this computes all edges - * that lead from SUPERSTATE given CHR. This function also - * computes the set of characters that share this edge set. - * This returns 0 on allocation error. - * The character set and list of edges are returned through - * the paramters CSETOUT and DFOUT. -} */ - -#ifdef __STDC__ -static int -compute_super_edge (struct rx *rx, struct rx_distinct_future **dfout, - rx_Bitset csetout, struct rx_superstate *superstate, - unsigned char chr) -#else -static int -compute_super_edge (rx, dfout, csetout, superstate, chr) - struct rx *rx; - struct rx_distinct_future **dfout; - rx_Bitset csetout; - struct rx_superstate *superstate; - unsigned char chr; -#endif -{ - struct rx_superset *stateset = superstate->contents; - - /* To compute the set of characters that share edges with CHR, - * we start with the full character set, and subtract. - */ - rx_bitset_universe (rx->local_cset_size, csetout); - *dfout = 0; - - /* Iterate over the NFA states in the superstate state-set. */ - while (stateset->car) - { - struct rx_nfa_edge *e; - for (e = stateset->car->edges; e; e = e->next) - if (RX_bitset_member (e->params.cset, chr)) - { - /* If we find an NFA edge that applies, we make sure there - * are corresponding edges in the superstate NFA. - */ - { - struct rx_distinct_future * saved; - saved = *dfout; - *dfout = include_futures (rx, *dfout, e->dest, superstate); - if (!*dfout) - { - struct rx_distinct_future * df; - df = saved; - if (df) - df->next_same_super_edge[1]->next_same_super_edge[0] = 0; - while (df) - { - struct rx_distinct_future *dft; - dft = df; - df = df->next_same_super_edge[0]; - - if (dft->future && dft->future->transition_refs == dft) - { - dft->future->transition_refs = dft->next_same_dest; - if (dft->future->transition_refs == dft) - dft->future->transition_refs = 0; - } - dft->next_same_dest->prev_same_dest = dft->prev_same_dest; - dft->prev_same_dest->next_same_dest = dft->next_same_dest; - rx_cache_free (rx->cache, - &rx->cache->free_discernable_futures, - (char *)dft); - } - return 0; - } - } - /* We also trim the character set a bit. */ - rx_bitset_intersection (rx->local_cset_size, - csetout, e->params.cset); - } - else - /* An edge that doesn't apply at least tells us some characters - * that don't share the same edge set as CHR. - */ - rx_bitset_difference (rx->local_cset_size, csetout, e->params.cset); - stateset = stateset->cdr; - } - return 1; -} - - -/* This is a constructor for RX_SUPER_EDGE structures. These are - * wrappers for lists of superstate NFA edges that share character sets labels. - * If a transition class contains more than one rx_distinct_future (superstate - * edge), then it represents a non-determinism in the superstate NFA. - */ - -#ifdef __STDC__ -static struct rx_super_edge * -rx_super_edge (struct rx *rx, - struct rx_superstate *super, rx_Bitset cset, - struct rx_distinct_future *df) -#else -static struct rx_super_edge * -rx_super_edge (rx, super, cset, df) - struct rx *rx; - struct rx_superstate *super; - rx_Bitset cset; - struct rx_distinct_future *df; -#endif -{ - struct rx_super_edge *tc = - (struct rx_super_edge *)rx_cache_malloc_or_get - (rx->cache, &rx->cache->free_transition_classes, - sizeof (struct rx_super_edge) + rx_sizeof_bitset (rx->local_cset_size)); - - if (!tc) - return 0; - tc->next = super->edges; - super->edges = tc; - tc->rx_backtrack_frame.inx = rx->instruction_table[rx_backtrack_point]; - tc->rx_backtrack_frame.data = 0; - tc->rx_backtrack_frame.data_2 = (void *) tc; - tc->options = df; - tc->cset = (rx_Bitset) ((char *) tc + sizeof (*tc)); - rx_bitset_assign (rx->local_cset_size, tc->cset, cset); - if (df) - { - struct rx_distinct_future * dfp = df; - df->next_same_super_edge[1]->next_same_super_edge[0] = 0; - while (dfp) - { - dfp->edge = tc; - dfp = dfp->next_same_super_edge[0]; - } - df->next_same_super_edge[1]->next_same_super_edge[0] = df; - } - return tc; -} - - -/* There are three kinds of cache miss. The first occurs when a - * transition is taken that has never been computed during the - * lifetime of the source superstate. That cache miss is handled by - * calling COMPUTE_SUPER_EDGE. The second kind of cache miss - * occurs when the destination superstate of a transition doesn't - * exist. SOLVE_DESTINATION is used to construct the destination superstate. - * Finally, the third kind of cache miss occurs when the destination - * superstate of a transition is in a `semi-free state'. That case is - * handled by UNFREE_SUPERSTATE. - * - * The function of HANDLE_CACHE_MISS is to figure out which of these - * cases applies. - */ - -#ifdef __STDC__ -static void -install_partial_transition (struct rx_superstate *super, - struct rx_inx *answer, - RX_subset set, int offset) -#else -static void -install_partial_transition (super, answer, set, offset) - struct rx_superstate *super; - struct rx_inx *answer; - RX_subset set; - int offset; -#endif -{ - int start = offset; - int end = start + 32; - RX_subset pos = 1; - struct rx_inx * transitions = super->transitions; - - while (start < end) - { - if (set & pos) - transitions[start] = *answer; - pos <<= 1; - ++start; - } -} - - -#ifdef __STDC__ -RX_DECL struct rx_inx * -rx_handle_cache_miss - (struct rx *rx, struct rx_superstate *super, unsigned char chr, void *data) -#else -RX_DECL struct rx_inx * -rx_handle_cache_miss (rx, super, chr, data) - struct rx *rx; - struct rx_superstate *super; - unsigned char chr; - void *data; -#endif -{ - int offset = chr / RX_subset_bits; - struct rx_distinct_future *df = data; - - if (!df) /* must be the shared_cache_miss_frame */ - { - /* Perhaps this is just a transition waiting to be filled. */ - struct rx_super_edge *tc; - RX_subset mask = rx_subset_singletons [chr % RX_subset_bits]; - - for (tc = super->edges; tc; tc = tc->next) - if (tc->cset[offset] & mask) - { - struct rx_inx * answer; - df = tc->options; - answer = ((tc->options->next_same_super_edge[0] != tc->options) - ? &tc->rx_backtrack_frame - : (df->effects - ? &df->side_effects_frame - : &df->future_frame)); - install_partial_transition (super, answer, - tc->cset [offset], offset * 32); - return answer; - } - /* Otherwise, it's a flushed or newly encountered edge. */ - { - char cset_space[1024]; /* this limit is far from unreasonable */ - rx_Bitset trcset; - struct rx_inx *answer; - - if (rx_sizeof_bitset (rx->local_cset_size) > sizeof (cset_space)) - return 0; /* If the arbitrary limit is hit, always fail */ - /* cleanly. */ - trcset = (rx_Bitset)cset_space; - rx_lock_superstate (rx, super); - if (!compute_super_edge (rx, &df, trcset, super, chr)) - { - rx_unlock_superstate (rx, super); - return 0; - } - if (!df) /* We just computed the fail transition. */ - { - static struct rx_inx - shared_fail_frame = { 0, 0, (void *)rx_backtrack, 0 }; - answer = &shared_fail_frame; - } - else - { - tc = rx_super_edge (rx, super, trcset, df); - if (!tc) - { - rx_unlock_superstate (rx, super); - return 0; - } - answer = ((tc->options->next_same_super_edge[0] != tc->options) - ? &tc->rx_backtrack_frame - : (df->effects - ? &df->side_effects_frame - : &df->future_frame)); - } - install_partial_transition (super, answer, - trcset[offset], offset * 32); - rx_unlock_superstate (rx, super); - return answer; - } - } - else if (df->future) /* A cache miss on an edge with a future? Must be - * a semi-free destination. */ - { - if (df->future->is_semifree) - refresh_semifree_superstate (rx->cache, df->future); - return &df->future_frame; - } - else - /* no future superstate on an existing edge */ - { - rx_lock_superstate (rx, super); - if (!solve_destination (rx, df)) - { - rx_unlock_superstate (rx, super); - return 0; - } - if (!df->effects - && (df->edge->options->next_same_super_edge[0] == df->edge->options)) - install_partial_transition (super, &df->future_frame, - df->edge->cset[offset], offset * 32); - rx_unlock_superstate (rx, super); - return &df->future_frame; - } -} - - - - -/* The rest of the code provides a regex.c compatable interface. */ - - -__const__ char *re_error_msg[] = -{ - 0, /* REG_NOUT */ - "No match", /* REG_NOMATCH */ - "Invalid regular expression", /* REG_BADPAT */ - "Invalid collation character", /* REG_ECOLLATE */ - "Invalid character class name", /* REG_ECTYPE */ - "Trailing backslash", /* REG_EESCAPE */ - "Invalid back reference", /* REG_ESUBREG */ - "Unmatched [ or [^", /* REG_EBRACK */ - "Unmatched ( or \\(", /* REG_EPAREN */ - "Unmatched \\{", /* REG_EBRACE */ - "Invalid content of \\{\\}", /* REG_BADBR */ - "Invalid range end", /* REG_ERANGE */ - "Memory exhausted", /* REG_ESPACE */ - "Invalid preceding regular expression", /* REG_BADRPT */ - "Premature end of regular expression", /* REG_EEND */ - "Regular expression too big", /* REG_ESIZE */ - "Unmatched ) or \\)", /* REG_ERPAREN */ -}; - - - -/* - * Macros used while compiling patterns. - * - * By convention, PEND points just past the end of the uncompiled pattern, - * P points to the read position in the pattern. `translate' is the name - * of the translation table (`TRANSLATE' is the name of a macro that looks - * things up in `translate'). - */ - - -/* - * Fetch the next character in the uncompiled pattern---translating it - * if necessary. *Also cast from a signed character in the constant - * string passed to us by the user to an unsigned char that we can use - * as an array index (in, e.g., `translate'). - */ -#define PATFETCH(c) \ - do {if (p == pend) return REG_EEND; \ - c = (unsigned char) *p++; \ - c = translate[c]; \ - } while (0) - -/* - * Fetch the next character in the uncompiled pattern, with no - * translation. - */ -#define PATFETCH_RAW(c) \ - do {if (p == pend) return REG_EEND; \ - c = (unsigned char) *p++; \ - } while (0) - -/* Go backwards one character in the pattern. */ -#define PATUNFETCH p-- - - -#define TRANSLATE(d) translate[(unsigned char) (d)] - -typedef unsigned regnum_t; - -/* Since offsets can go either forwards or backwards, this type needs to - * be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. - */ -typedef int pattern_offset_t; - -typedef struct -{ - struct rexp_node ** top_expression; /* was begalt */ - struct rexp_node ** last_expression; /* was laststart */ - pattern_offset_t inner_group_offset; - regnum_t regnum; -} compile_stack_elt_t; - -typedef struct -{ - compile_stack_elt_t *stack; - unsigned size; - unsigned avail; /* Offset of next open position. */ -} compile_stack_type; - - -#define INIT_COMPILE_STACK_SIZE 32 - -#define COMPILE_STACK_EMPTY (compile_stack.avail == 0) -#define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size) - -/* The next available element. */ -#define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail]) - - -/* Set the bit for character C in a list. */ -#define SET_LIST_BIT(c) \ - (b[((unsigned char) (c)) / CHARBITS] \ - |= 1 << (((unsigned char) c) % CHARBITS)) - -/* Get the next unsigned number in the uncompiled pattern. */ -#define GET_UNSIGNED_NUMBER(num) \ - { if (p != pend) \ - { \ - PATFETCH (c); \ - while (isdigit (c)) \ - { \ - if (num < 0) \ - num = 0; \ - num = num * 10 + c - '0'; \ - if (p == pend) \ - break; \ - PATFETCH (c); \ - } \ - } \ - } - -#define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */ - -#define IS_CHAR_CLASS(string) \ - (!strcmp (string, "alpha") || !strcmp (string, "upper") \ - || !strcmp (string, "lower") || !strcmp (string, "digit") \ - || !strcmp (string, "alnum") || !strcmp (string, "xdigit") \ - || !strcmp (string, "space") || !strcmp (string, "print") \ - || !strcmp (string, "punct") || !strcmp (string, "graph") \ - || !strcmp (string, "cntrl") || !strcmp (string, "blank")) - - -/* These predicates are used in regex_compile. */ - -/* P points to just after a ^ in PATTERN. Return true if that ^ comes - * after an alternative or a begin-subexpression. We assume there is at - * least one character before the ^. - */ - -#ifdef __STDC__ -static boolean -at_begline_loc_p (__const__ char *pattern, __const__ char * p, reg_syntax_t syntax) -#else -static boolean -at_begline_loc_p (pattern, p, syntax) - __const__ char *pattern; - __const__ char * p; - reg_syntax_t syntax; -#endif -{ - __const__ char *prev = p - 2; - boolean prev_prev_backslash = ((prev > pattern) && (prev[-1] == '\\')); - - return - - (/* After a subexpression? */ - ((*prev == '(') && ((syntax & RE_NO_BK_PARENS) || prev_prev_backslash)) - || - /* After an alternative? */ - ((*prev == '|') && ((syntax & RE_NO_BK_VBAR) || prev_prev_backslash)) - ); -} - -/* The dual of at_begline_loc_p. This one is for $. We assume there is - * at least one character after the $, i.e., `P < PEND'. - */ - -#ifdef __STDC__ -static boolean -at_endline_loc_p (__const__ char *p, __const__ char *pend, int syntax) -#else -static boolean -at_endline_loc_p (p, pend, syntax) - __const__ char *p; - __const__ char *pend; - int syntax; -#endif -{ - __const__ char *next = p; - boolean next_backslash = (*next == '\\'); - __const__ char *next_next = (p + 1 < pend) ? (p + 1) : 0; - - return - ( - /* Before a subexpression? */ - ((syntax & RE_NO_BK_PARENS) - ? (*next == ')') - : (next_backslash && next_next && (*next_next == ')'))) - || - /* Before an alternative? */ - ((syntax & RE_NO_BK_VBAR) - ? (*next == '|') - : (next_backslash && next_next && (*next_next == '|'))) - ); -} - - -unsigned char rx_id_translation[256] = -{ - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, - 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, - 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, - 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, - 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, - 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, - 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, - 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, - 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, - 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, - - 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, - 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, - 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, - 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, - 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, - 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, - 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, - 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, - 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, - 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, - - 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, - 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, - 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, - 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, - 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, - 250, 251, 252, 253, 254, 255 -}; - -/* The compiler keeps an inverted translation table. - * This looks up/inititalize elements. - * VALID is an array of booleans that validate CACHE. - */ - -#ifdef __STDC__ -static rx_Bitset -inverse_translation (struct re_pattern_buffer * rxb, - char * valid, rx_Bitset cache, - unsigned char * translate, int c) -#else -static rx_Bitset -inverse_translation (rxb, valid, cache, translate, c) - struct re_pattern_buffer * rxb; - char * valid; - rx_Bitset cache; - unsigned char * translate; - int c; -#endif -{ - rx_Bitset cs - = cache + c * rx_bitset_numb_subsets (rxb->rx.local_cset_size); - - if (!valid[c]) - { - int x; - int c_tr = TRANSLATE(c); - rx_bitset_null (rxb->rx.local_cset_size, cs); - for (x = 0; x < 256; ++x) /* &&&& 13.37 */ - if (TRANSLATE(x) == c_tr) - RX_bitset_enjoin (cs, x); - valid[c] = 1; - } - return cs; -} - - - - -/* More subroutine declarations and macros for regex_compile. */ - -/* Returns true if REGNUM is in one of COMPILE_STACK's elements and - false if it's not. */ - -#ifdef __STDC__ -static boolean -group_in_compile_stack (compile_stack_type compile_stack, regnum_t regnum) -#else -static boolean -group_in_compile_stack (compile_stack, regnum) - compile_stack_type compile_stack; - regnum_t regnum; -#endif -{ - int this_element; - - for (this_element = compile_stack.avail - 1; - this_element >= 0; - this_element--) - if (compile_stack.stack[this_element].regnum == regnum) - return true; - - return false; -} - - -/* - * Read the ending character of a range (in a bracket expression) from the - * uncompiled pattern *P_PTR (which ends at PEND). We assume the - * starting character is in `P[-2]'. (`P[-1]' is the character `-'.) - * Then we set the translation of all bits between the starting and - * ending characters (inclusive) in the compiled pattern B. - * - * Return an error code. - * - * We use these short variable names so we can use the same macros as - * `regex_compile' itself. - */ - -#ifdef __STDC__ -static reg_errcode_t -compile_range (struct re_pattern_buffer * rxb, rx_Bitset cs, - __const__ char ** p_ptr, __const__ char * pend, - unsigned char * translate, reg_syntax_t syntax, - rx_Bitset inv_tr, char * valid_inv_tr) -#else -static reg_errcode_t -compile_range (rxb, cs, p_ptr, pend, translate, syntax, inv_tr, valid_inv_tr) - struct re_pattern_buffer * rxb; - rx_Bitset cs; - __const__ char ** p_ptr; - __const__ char * pend; - unsigned char * translate; - reg_syntax_t syntax; - rx_Bitset inv_tr; - char * valid_inv_tr; -#endif -{ - unsigned this_char; - - __const__ char *p = *p_ptr; - - unsigned char range_end; - unsigned char range_start = TRANSLATE(p[-2]); - - if (p == pend) - return REG_ERANGE; - - PATFETCH (range_end); - - (*p_ptr)++; - - if (range_start > range_end) - return syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR; - - for (this_char = range_start; this_char <= range_end; this_char++) - { - rx_Bitset it = - inverse_translation (rxb, valid_inv_tr, inv_tr, translate, this_char); - rx_bitset_union (rxb->rx.local_cset_size, cs, it); - } - - return REG_NOERROR; -} - - -/* This searches a regexp for backreference side effects. - * It fills in the array OUT with 1 at the index of every register pair - * referenced by a backreference. - * - * This is used to help optimize patterns for searching. The information is - * useful because, if the caller doesn't want register values, backreferenced - * registers are the only registers for which we need rx_backtrack. - */ - -#ifdef __STDC__ -static void -find_backrefs (char * out, struct rexp_node * rexp, - struct re_se_params * params) -#else -static void -find_backrefs (out, rexp, params) - char * out; - struct rexp_node * rexp; - struct re_se_params * params; -#endif -{ - if (rexp) - switch (rexp->type) - { - case r_cset: - case r_data: - return; - case r_alternate: - case r_concat: - case r_opt: - case r_star: - case r_2phase_star: - find_backrefs (out, rexp->params.pair.left, params); - find_backrefs (out, rexp->params.pair.right, params); - return; - case r_side_effect: - if ( ((long)rexp->params.side_effect >= 0) - && (params [(long)rexp->params.side_effect].se == re_se_backref)) - out[ params [(long)rexp->params.side_effect].op1] = 1; - return; - } -} - - - -/* Returns 0 unless the pattern can match the empty string. */ - -#ifdef __STDC__ -static int -compute_fastset (struct re_pattern_buffer * rxb, struct rexp_node * rexp) -#else -static int -compute_fastset (rxb, rexp) - struct re_pattern_buffer * rxb; - struct rexp_node * rexp; -#endif -{ - if (!rexp) - return 1; - switch (rexp->type) - { - case r_data: - return 1; - case r_cset: - { - rx_bitset_union (rxb->rx.local_cset_size, - rxb->fastset, rexp->params.cset); - } - return 0; - case r_concat: - return (compute_fastset (rxb, rexp->params.pair.left) - && compute_fastset (rxb, rexp->params.pair.right)); - case r_2phase_star: - compute_fastset (rxb, rexp->params.pair.left); - /* compute_fastset (rxb, rexp->params.pair.right); nope... */ - return 1; - case r_alternate: - return !!(compute_fastset (rxb, rexp->params.pair.left) - + compute_fastset (rxb, rexp->params.pair.right)); - case r_opt: - case r_star: - compute_fastset (rxb, rexp->params.pair.left); - return 1; - case r_side_effect: - return 1; - } - - /* this should never happen */ - return 0; -} - - -/* returns - * 1 -- yes, definately anchored by the given side effect. - * 2 -- maybe anchored, maybe the empty string. - * 0 -- definately not anchored - * There is simply no other possibility. - */ - -#ifdef __STDC__ -static int -is_anchored (struct rexp_node * rexp, rx_side_effect se) -#else -static int -is_anchored (rexp, se) - struct rexp_node * rexp; - rx_side_effect se; -#endif -{ - if (!rexp) - return 2; - switch (rexp->type) - { - case r_cset: - case r_data: - return 0; - case r_concat: - case r_2phase_star: - { - int l = is_anchored (rexp->params.pair.left, se); - return (l == 2 ? is_anchored (rexp->params.pair.right, se) : l); - } - case r_alternate: - { - int l = is_anchored (rexp->params.pair.left, se); - int r = l ? is_anchored (rexp->params.pair.right, se) : 0; - - if (l == r) - return l; - else if ((l == 0) || (r == 0)) - return 0; - else - return 2; - } - case r_opt: - case r_star: - return is_anchored (rexp->params.pair.left, se) ? 2 : 0; - - case r_side_effect: - return ((rexp->params.side_effect == se) - ? 1 : 2); - } - - /* this should never happen */ - return 0; -} - - -/* This removes register assignments that aren't required by backreferencing. - * This can speed up explore_future, especially if it eliminates - * non-determinism in the superstate NFA. - * - * NEEDED is an array of characters, presumably filled in by FIND_BACKREFS. - * The non-zero elements of the array indicate which register assignments - * can NOT be removed from the expression. - */ - -#ifdef __STDC__ -static struct rexp_node * -remove_unecessary_side_effects (struct rx * rx, char * needed, - struct rexp_node * rexp, - struct re_se_params * params) -#else -static struct rexp_node * -remove_unecessary_side_effects (rx, needed, rexp, params) - struct rx * rx; - char * needed; - struct rexp_node * rexp; - struct re_se_params * params; -#endif -{ - struct rexp_node * l; - struct rexp_node * r; - if (!rexp) - return 0; - else - switch (rexp->type) - { - case r_cset: - case r_data: - return rexp; - case r_alternate: - case r_concat: - case r_2phase_star: - l = remove_unecessary_side_effects (rx, needed, - rexp->params.pair.left, params); - r = remove_unecessary_side_effects (rx, needed, - rexp->params.pair.right, params); - if ((l && r) || (rexp->type != r_concat)) - { - rexp->params.pair.left = l; - rexp->params.pair.right = r; - return rexp; - } - else - { - rexp->params.pair.left = rexp->params.pair.right = 0; - rx_free_rexp (rx, rexp); - return l ? l : r; - } - case r_opt: - case r_star: - l = remove_unecessary_side_effects (rx, needed, - rexp->params.pair.left, params); - if (l) - { - rexp->params.pair.left = l; - return rexp; - } - else - { - rexp->params.pair.left = 0; - rx_free_rexp (rx, rexp); - return 0; - } - case r_side_effect: - { - int se = (long)rexp->params.side_effect; - if ( (se >= 0) - && ( ((enum re_side_effects)params[se].se == re_se_lparen) - || ((enum re_side_effects)params[se].se == re_se_rparen)) - && (params [se].op1 > 0) - && (!needed [params [se].op1])) - { - rx_free_rexp (rx, rexp); - return 0; - } - else - return rexp; - } - } - - /* this should never happen */ - return 0; -} - - - -#ifdef __STDC__ -static int -pointless_if_repeated (struct rexp_node * node, struct re_se_params * params) -#else -static int -pointless_if_repeated (node, params) - struct rexp_node * node; - struct re_se_params * params; -#endif -{ - if (!node) - return 1; - switch (node->type) - { - case r_cset: - return 0; - case r_alternate: - case r_concat: - case r_2phase_star: - return (pointless_if_repeated (node->params.pair.left, params) - && pointless_if_repeated (node->params.pair.right, params)); - case r_opt: - case r_star: - return pointless_if_repeated (node->params.pair.left, params); - case r_side_effect: - switch (((long)node->params.side_effect < 0) - ? (enum re_side_effects)node->params.side_effect - : (enum re_side_effects)params[(long)node->params.side_effect].se) - { - case re_se_try: - case re_se_at_dot: - case re_se_begbuf: - case re_se_hat: - case re_se_wordbeg: - case re_se_wordbound: - case re_se_notwordbound: - case re_se_wordend: - case re_se_endbuf: - case re_se_dollar: - case re_se_fail: - case re_se_win: - return 1; - case re_se_lparen: - case re_se_rparen: - case re_se_iter: - case re_se_end_iter: - case re_se_syntax: - case re_se_not_syntax: - case re_se_backref: - return 0; - } - case r_data: - default: - return 0; - } -} - - - -#ifdef __STDC__ -static int -registers_on_stack (struct re_pattern_buffer * rxb, - struct rexp_node * rexp, int in_danger, - struct re_se_params * params) -#else -static int -registers_on_stack (rxb, rexp, in_danger, params) - struct re_pattern_buffer * rxb; - struct rexp_node * rexp; - int in_danger; - struct re_se_params * params; -#endif -{ - if (!rexp) - return 0; - else - switch (rexp->type) - { - case r_cset: - case r_data: - return 0; - case r_alternate: - case r_concat: - return ( registers_on_stack (rxb, rexp->params.pair.left, - in_danger, params) - || (registers_on_stack - (rxb, rexp->params.pair.right, - in_danger, params))); - case r_opt: - return registers_on_stack (rxb, rexp->params.pair.left, 0, params); - case r_star: - return registers_on_stack (rxb, rexp->params.pair.left, 1, params); - case r_2phase_star: - return - ( registers_on_stack (rxb, rexp->params.pair.left, 1, params) - || registers_on_stack (rxb, rexp->params.pair.right, 1, params)); - case r_side_effect: - { - int se = (long)rexp->params.side_effect; - if ( in_danger - && (se >= 0) - && (params [se].op1 > 0) - && ( ((enum re_side_effects)params[se].se == re_se_lparen) - || ((enum re_side_effects)params[se].se == re_se_rparen))) - return 1; - else - return 0; - } - } - - /* this should never happen */ - return 0; -} - - - -static char idempotent_complex_se[] = -{ -#define RX_WANT_SE_DEFS 1 -#undef RX_DEF_SE -#undef RX_DEF_CPLX_SE -#define RX_DEF_SE(IDEM, NAME, VALUE) -#define RX_DEF_CPLX_SE(IDEM, NAME, VALUE) IDEM, -#include "rx.h" -#undef RX_DEF_SE -#undef RX_DEF_CPLX_SE -#undef RX_WANT_SE_DEFS - 23 -}; - -static char idempotent_se[] = -{ - 13, -#define RX_WANT_SE_DEFS 1 -#undef RX_DEF_SE -#undef RX_DEF_CPLX_SE -#define RX_DEF_SE(IDEM, NAME, VALUE) IDEM, -#define RX_DEF_CPLX_SE(IDEM, NAME, VALUE) -#include "rx.h" -#undef RX_DEF_SE -#undef RX_DEF_CPLX_SE -#undef RX_WANT_SE_DEFS - 42 -}; - - - - -#ifdef __STDC__ -static int -has_any_se (struct rx * rx, - struct rexp_node * rexp) -#else -static int -has_any_se (rx, rexp) - struct rx * rx; - struct rexp_node * rexp; -#endif -{ - if (!rexp) - return 0; - - switch (rexp->type) - { - case r_cset: - case r_data: - return 0; - - case r_side_effect: - return 1; - - case r_2phase_star: - case r_concat: - case r_alternate: - return - ( has_any_se (rx, rexp->params.pair.left) - || has_any_se (rx, rexp->params.pair.right)); - - case r_opt: - case r_star: - return has_any_se (rx, rexp->params.pair.left); - } - - /* this should never happen */ - return 0; -} - - - -/* This must be called AFTER `convert_hard_loops' for a given REXP. */ -#ifdef __STDC__ -static int -has_non_idempotent_epsilon_path (struct rx * rx, - struct rexp_node * rexp, - struct re_se_params * params) -#else -static int -has_non_idempotent_epsilon_path (rx, rexp, params) - struct rx * rx; - struct rexp_node * rexp; - struct re_se_params * params; -#endif -{ - if (!rexp) - return 0; - - switch (rexp->type) - { - case r_cset: - case r_data: - case r_star: - return 0; - - case r_side_effect: - return - !((long)rexp->params.side_effect > 0 - ? idempotent_complex_se [ params [(long)rexp->params.side_effect].se ] - : idempotent_se [-(long)rexp->params.side_effect]); - - case r_alternate: - return - ( has_non_idempotent_epsilon_path (rx, - rexp->params.pair.left, params) - || has_non_idempotent_epsilon_path (rx, - rexp->params.pair.right, params)); - - case r_2phase_star: - case r_concat: - return - ( has_non_idempotent_epsilon_path (rx, - rexp->params.pair.left, params) - && has_non_idempotent_epsilon_path (rx, - rexp->params.pair.right, params)); - - case r_opt: - return has_non_idempotent_epsilon_path (rx, - rexp->params.pair.left, params); - } - - /* this should never happen */ - return 0; -} - - - -/* This computes rougly what it's name suggests. It can (and does) go wrong - * in the direction of returning spurious 0 without causing disasters. - */ -#ifdef __STDC__ -static int -begins_with_complex_se (struct rx * rx, struct rexp_node * rexp) -#else -static int -begins_with_complex_se (rx, rexp) - struct rx * rx; - struct rexp_node * rexp; -#endif -{ - if (!rexp) - return 0; - - switch (rexp->type) - { - case r_cset: - case r_data: - return 0; - - case r_side_effect: - return ((long)rexp->params.side_effect >= 0); - - case r_alternate: - return - ( begins_with_complex_se (rx, rexp->params.pair.left) - && begins_with_complex_se (rx, rexp->params.pair.right)); - - - case r_concat: - return has_any_se (rx, rexp->params.pair.left); - case r_opt: - case r_star: - case r_2phase_star: - return 0; - } - - /* this should never happen */ - return 0; -} - - -/* This destructively removes some of the re_se_tv side effects from - * a rexp tree. In particular, during parsing re_se_tv was inserted on the - * right half of every | to guarantee that posix path preference could be - * honored. This function removes some which it can be determined aren't - * needed. - */ - -#ifdef __STDC__ -static void -speed_up_alt (struct rx * rx, - struct rexp_node * rexp, - int unposix) -#else -static void -speed_up_alt (rx, rexp, unposix) - struct rx * rx; - struct rexp_node * rexp; - int unposix; -#endif -{ - if (!rexp) - return; - - switch (rexp->type) - { - case r_cset: - case r_data: - case r_side_effect: - return; - - case r_opt: - case r_star: - speed_up_alt (rx, rexp->params.pair.left, unposix); - return; - - case r_2phase_star: - case r_concat: - speed_up_alt (rx, rexp->params.pair.left, unposix); - speed_up_alt (rx, rexp->params.pair.right, unposix); - return; - - case r_alternate: - /* the right child is guaranteed to be (concat re_se_tv <subexp>) */ - - speed_up_alt (rx, rexp->params.pair.left, unposix); - speed_up_alt (rx, rexp->params.pair.right->params.pair.right, unposix); - - if ( unposix - || (begins_with_complex_se - (rx, rexp->params.pair.right->params.pair.right)) - || !( has_any_se (rx, rexp->params.pair.right->params.pair.right) - || has_any_se (rx, rexp->params.pair.left))) - { - struct rexp_node * conc = rexp->params.pair.right; - rexp->params.pair.right = conc->params.pair.right; - conc->params.pair.right = 0; - rx_free_rexp (rx, conc); - } - } -} - - - - - -/* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX. - Returns one of error codes defined in `regex.h', or zero for success. - - Assumes the `allocated' (and perhaps `buffer') and `translate' - fields are set in BUFP on entry. - - If it succeeds, results are put in BUFP (if it returns an error, the - contents of BUFP are undefined): - `buffer' is the compiled pattern; - `syntax' is set to SYNTAX; - `used' is set to the length of the compiled pattern; - `fastmap_accurate' is set to zero; - `re_nsub' is set to the number of groups in PATTERN; - `not_bol' and `not_eol' are set to zero. - - The `fastmap' and `newline_anchor' fields are neither - examined nor set. */ - - - -#ifdef __STDC__ -RX_DECL reg_errcode_t -rx_compile (__const__ char *pattern, int size, - reg_syntax_t syntax, - struct re_pattern_buffer * rxb) -#else -RX_DECL reg_errcode_t -rx_compile (pattern, size, syntax, rxb) - __const__ char *pattern; - int size; - reg_syntax_t syntax; - struct re_pattern_buffer * rxb; -#endif -{ - RX_subset - inverse_translate [CHAR_SET_SIZE * rx_bitset_numb_subsets(CHAR_SET_SIZE)]; - char - validate_inv_tr [CHAR_SET_SIZE * rx_bitset_numb_subsets(CHAR_SET_SIZE)]; - - /* We fetch characters from PATTERN here. Even though PATTERN is - `char *' (i.e., signed), we declare these variables as unsigned, so - they can be reliably used as array indices. */ - register unsigned char c, c1; - - /* A random tempory spot in PATTERN. */ - __const__ char *p1; - - /* Keeps track of unclosed groups. */ - compile_stack_type compile_stack; - - /* Points to the current (ending) position in the pattern. */ - __const__ char *p = pattern; - __const__ char *pend = pattern + size; - - /* How to translate the characters in the pattern. */ - unsigned char *translate = (rxb->translate - ? rxb->translate - : rx_id_translation); - - /* When parsing is done, this will hold the expression tree. */ - struct rexp_node * rexp = 0; - - /* In the midst of compilation, this holds onto the regexp - * first parst while rexp goes on to aquire additional constructs. - */ - struct rexp_node * orig_rexp = 0; - struct rexp_node * fewer_side_effects = 0; - - /* This and top_expression are saved on the compile stack. */ - struct rexp_node ** top_expression = &rexp; - struct rexp_node ** last_expression = top_expression; - - /* Parameter to `goto append_node' */ - struct rexp_node * append; - - /* Counts open-groups as they are encountered. This is the index of the - * innermost group being compiled. - */ - regnum_t regnum = 0; - - /* Place in the uncompiled pattern (i.e., the {) to - * which to go back if the interval is invalid. - */ - __const__ char *beg_interval; - - struct re_se_params * params = 0; - int paramc = 0; /* How many complex side effects so far? */ - - rx_side_effect side; /* param to `goto add_side_effect' */ - - bzero (validate_inv_tr, sizeof (validate_inv_tr)); - - rxb->rx.instruction_table = rx_id_instruction_table; - - - /* Initialize the compile stack. */ - compile_stack.stack = (( compile_stack_elt_t *) malloc ((INIT_COMPILE_STACK_SIZE) * sizeof ( compile_stack_elt_t))); - if (compile_stack.stack == 0) - return REG_ESPACE; - - compile_stack.size = INIT_COMPILE_STACK_SIZE; - compile_stack.avail = 0; - - /* Initialize the pattern buffer. */ - rxb->rx.cache = &default_cache; - rxb->syntax = syntax; - rxb->fastmap_accurate = 0; - rxb->not_bol = rxb->not_eol = 0; - rxb->least_subs = 0; - - /* Always count groups, whether or not rxb->no_sub is set. - * The whole pattern is implicitly group 0, so counting begins - * with 1. - */ - rxb->re_nsub = 0; - -#if !defined (emacs) && !defined (SYNTAX) - /* Initialize the syntax table. */ - init_syntax_once (); -#endif - - /* Loop through the uncompiled pattern until we're at the end. */ - while (p != pend) - { - PATFETCH (c); - - switch (c) - { - case '^': - { - if ( /* If at start of pattern, it's an operator. */ - p == pattern + 1 - /* If context independent, it's an operator. */ - || syntax & RE_CONTEXT_INDEP_ANCHORS - /* Otherwise, depends on what's come before. */ - || at_begline_loc_p (pattern, p, syntax)) - { - struct rexp_node * n - = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)re_se_hat); - if (!n) - return REG_ESPACE; - append = n; - goto append_node; - } - else - goto normal_char; - } - break; - - - case '$': - { - if ( /* If at end of pattern, it's an operator. */ - p == pend - /* If context independent, it's an operator. */ - || syntax & RE_CONTEXT_INDEP_ANCHORS - /* Otherwise, depends on what's next. */ - || at_endline_loc_p (p, pend, syntax)) - { - struct rexp_node * n - = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)re_se_dollar); - if (!n) - return REG_ESPACE; - append = n; - goto append_node; - } - else - goto normal_char; - } - break; - - - case '+': - case '?': - if ((syntax & RE_BK_PLUS_QM) - || (syntax & RE_LIMITED_OPS)) - goto normal_char; - - handle_plus: - case '*': - /* If there is no previous pattern... */ - if (pointless_if_repeated (*last_expression, params)) - { - if (syntax & RE_CONTEXT_INVALID_OPS) - return REG_BADRPT; - else if (!(syntax & RE_CONTEXT_INDEP_OPS)) - goto normal_char; - } - - { - /* 1 means zero (many) matches is allowed. */ - char zero_times_ok = 0, many_times_ok = 0; - - /* If there is a sequence of repetition chars, collapse it - down to just one (the right one). We can't combine - interval operators with these because of, e.g., `a{2}*', - which should only match an even number of `a's. */ - - for (;;) - { - zero_times_ok |= c != '+'; - many_times_ok |= c != '?'; - - if (p == pend) - break; - - PATFETCH (c); - - if (c == '*' - || (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?'))) - ; - - else if (syntax & RE_BK_PLUS_QM && c == '\\') - { - if (p == pend) return REG_EESCAPE; - - PATFETCH (c1); - if (!(c1 == '+' || c1 == '?')) - { - PATUNFETCH; - PATUNFETCH; - break; - } - - c = c1; - } - else - { - PATUNFETCH; - break; - } - - /* If we get here, we found another repeat character. */ - } - - /* Star, etc. applied to an empty pattern is equivalent - to an empty pattern. */ - if (!last_expression) - break; - - /* Now we know whether or not zero matches is allowed - * and also whether or not two or more matches is allowed. - */ - - { - struct rexp_node * inner_exp = *last_expression; - int need_sync = 0; - - if (many_times_ok - && has_non_idempotent_epsilon_path (&rxb->rx, - inner_exp, params)) - { - struct rexp_node * pusher - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)re_se_pushpos); - struct rexp_node * checker - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)re_se_chkpos); - struct rexp_node * pushback - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)re_se_pushback); - rx_Bitset cs = rx_cset (&rxb->rx); - struct rexp_node * lit_t = rx_mk_r_cset (&rxb->rx, cs); - struct rexp_node * fake_state - = rx_mk_r_concat (&rxb->rx, pushback, lit_t); - struct rexp_node * phase2 - = rx_mk_r_concat (&rxb->rx, checker, fake_state); - struct rexp_node * popper - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)re_se_poppos); - struct rexp_node * star - = rx_mk_r_2phase_star (&rxb->rx, inner_exp, phase2); - struct rexp_node * a - = rx_mk_r_concat (&rxb->rx, pusher, star); - struct rexp_node * whole_thing - = rx_mk_r_concat (&rxb->rx, a, popper); - if (!(pusher && star && pushback && lit_t && fake_state - && lit_t && phase2 && checker && popper - && a && whole_thing)) - return REG_ESPACE; - RX_bitset_enjoin (cs, 't'); - *last_expression = whole_thing; - } - else - { - struct rexp_node * star = - (many_times_ok ? rx_mk_r_star : rx_mk_r_opt) - (&rxb->rx, *last_expression); - if (!star) - return REG_ESPACE; - *last_expression = star; - need_sync = has_any_se (&rxb->rx, *last_expression); - } - if (!zero_times_ok) - { - struct rexp_node * concat - = rx_mk_r_concat (&rxb->rx, inner_exp, - rx_copy_rexp (&rxb->rx, - *last_expression)); - if (!concat) - return REG_ESPACE; - *last_expression = concat; - } - if (need_sync) - { - int sync_se = paramc; - params = (params - ? ((struct re_se_params *) - realloc (params, - sizeof (*params) * (1 + paramc))) - : ((struct re_se_params *) - malloc (sizeof (*params)))); - if (!params) - return REG_ESPACE; - ++paramc; - params [sync_se].se = re_se_tv; - side = (rx_side_effect)sync_se; - goto add_side_effect; - } - } - /* The old regex.c used to optimize `.*\n'. - * Maybe rx should too? - */ - } - break; - - - case '.': - { - rx_Bitset cs = rx_cset (&rxb->rx); - struct rexp_node * n = rx_mk_r_cset (&rxb->rx, cs); - if (!(cs && n)) - return REG_ESPACE; - - rx_bitset_universe (rxb->rx.local_cset_size, cs); - if (!(rxb->syntax & RE_DOT_NEWLINE)) - RX_bitset_remove (cs, '\n'); - if (!(rxb->syntax & RE_DOT_NOT_NULL)) - RX_bitset_remove (cs, 0); - - append = n; - goto append_node; - break; - } - - - case '[': - if (p == pend) return REG_EBRACK; - { - boolean had_char_class = false; - rx_Bitset cs = rx_cset (&rxb->rx); - struct rexp_node * node = rx_mk_r_cset (&rxb->rx, cs); - int is_inverted = *p == '^'; - - if (!(node && cs)) - return REG_ESPACE; - - /* This branch of the switch is normally exited with - *`goto append_node' - */ - append = node; - - if (is_inverted) - p++; - - /* Remember the first position in the bracket expression. */ - p1 = p; - - /* Read in characters and ranges, setting map bits. */ - for (;;) - { - if (p == pend) return REG_EBRACK; - - PATFETCH (c); - - /* \ might escape characters inside [...] and [^...]. */ - if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\') - { - if (p == pend) return REG_EESCAPE; - - PATFETCH (c1); - { - rx_Bitset it = inverse_translation (rxb, - validate_inv_tr, - inverse_translate, - translate, - c1); - rx_bitset_union (rxb->rx.local_cset_size, cs, it); - } - continue; - } - - /* Could be the end of the bracket expression. If it's - not (i.e., when the bracket expression is `[]' so - far), the ']' character bit gets set way below. */ - if (c == ']' && p != p1 + 1) - goto finalize_class_and_append; - - /* Look ahead to see if it's a range when the last thing - was a character class. */ - if (had_char_class && c == '-' && *p != ']') - return REG_ERANGE; - - /* Look ahead to see if it's a range when the last thing - was a character: if this is a hyphen not at the - beginning or the end of a list, then it's the range - operator. */ - if (c == '-' - && !(p - 2 >= pattern && p[-2] == '[') - && !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^') - && *p != ']') - { - reg_errcode_t ret - = compile_range (rxb, cs, &p, pend, translate, syntax, - inverse_translate, validate_inv_tr); - if (ret != REG_NOERROR) return ret; - } - - else if (p[0] == '-' && p[1] != ']') - { /* This handles ranges made up of characters only. */ - reg_errcode_t ret; - - /* Move past the `-'. */ - PATFETCH (c1); - - ret = compile_range (rxb, cs, &p, pend, translate, syntax, - inverse_translate, validate_inv_tr); - if (ret != REG_NOERROR) return ret; - } - - /* See if we're at the beginning of a possible character - class. */ - - else if ((syntax & RE_CHAR_CLASSES) - && (c == '[') && (*p == ':')) - { - char str[CHAR_CLASS_MAX_LENGTH + 1]; - - PATFETCH (c); - c1 = 0; - - /* If pattern is `[[:'. */ - if (p == pend) return REG_EBRACK; - - for (;;) - { - PATFETCH (c); - if (c == ':' || c == ']' || p == pend - || c1 == CHAR_CLASS_MAX_LENGTH) - break; - str[c1++] = c; - } - str[c1] = '\0'; - - /* If isn't a word bracketed by `[:' and:`]': - undo the ending character, the letters, and leave - the leading `:' and `[' (but set bits for them). */ - if (c == ':' && *p == ']') - { - int ch; - boolean is_alnum = !strcmp (str, "alnum"); - boolean is_alpha = !strcmp (str, "alpha"); - boolean is_blank = !strcmp (str, "blank"); - boolean is_cntrl = !strcmp (str, "cntrl"); - boolean is_digit = !strcmp (str, "digit"); - boolean is_graph = !strcmp (str, "graph"); - boolean is_lower = !strcmp (str, "lower"); - boolean is_print = !strcmp (str, "print"); - boolean is_punct = !strcmp (str, "punct"); - boolean is_space = !strcmp (str, "space"); - boolean is_upper = !strcmp (str, "upper"); - boolean is_xdigit = !strcmp (str, "xdigit"); - - if (!IS_CHAR_CLASS (str)) return REG_ECTYPE; - - /* Throw away the ] at the end of the character - class. */ - PATFETCH (c); - - if (p == pend) return REG_EBRACK; - - for (ch = 0; ch < 1 << CHARBITS; ch++) - { - if ( (is_alnum && isalnum (ch)) - || (is_alpha && isalpha (ch)) - || (is_blank && isblank (ch)) - || (is_cntrl && iscntrl (ch)) - || (is_digit && isdigit (ch)) - || (is_graph && isgraph (ch)) - || (is_lower && islower (ch)) - || (is_print && isprint (ch)) - || (is_punct && ispunct (ch)) - || (is_space && isspace (ch)) - || (is_upper && isupper (ch)) - || (is_xdigit && isxdigit (ch))) - { - rx_Bitset it = - inverse_translation (rxb, - validate_inv_tr, - inverse_translate, - translate, - ch); - rx_bitset_union (rxb->rx.local_cset_size, - cs, it); - } - } - had_char_class = true; - } - else - { - c1++; - while (c1--) - PATUNFETCH; - { - rx_Bitset it = - inverse_translation (rxb, - validate_inv_tr, - inverse_translate, - translate, - '['); - rx_bitset_union (rxb->rx.local_cset_size, - cs, it); - } - { - rx_Bitset it = - inverse_translation (rxb, - validate_inv_tr, - inverse_translate, - translate, - ':'); - rx_bitset_union (rxb->rx.local_cset_size, - cs, it); - } - had_char_class = false; - } - } - else - { - had_char_class = false; - { - rx_Bitset it = inverse_translation (rxb, - validate_inv_tr, - inverse_translate, - translate, - c); - rx_bitset_union (rxb->rx.local_cset_size, cs, it); - } - } - } - - finalize_class_and_append: - if (is_inverted) - { - rx_bitset_complement (rxb->rx.local_cset_size, cs); - if (syntax & RE_HAT_LISTS_NOT_NEWLINE) - RX_bitset_remove (cs, '\n'); - } - goto append_node; - } - break; - - - case '(': - if (syntax & RE_NO_BK_PARENS) - goto handle_open; - else - goto normal_char; - - - case ')': - if (syntax & RE_NO_BK_PARENS) - goto handle_close; - else - goto normal_char; - - - case '\n': - if (syntax & RE_NEWLINE_ALT) - goto handle_alt; - else - goto normal_char; - - - case '|': - if (syntax & RE_NO_BK_VBAR) - goto handle_alt; - else - goto normal_char; - - - case '{': - if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES)) - goto handle_interval; - else - goto normal_char; - - - case '\\': - if (p == pend) return REG_EESCAPE; - - /* Do not translate the character after the \, so that we can - distinguish, e.g., \B from \b, even if we normally would - translate, e.g., B to b. */ - PATFETCH_RAW (c); - - switch (c) - { - case '(': - if (syntax & RE_NO_BK_PARENS) - goto normal_backslash; - - handle_open: - rxb->re_nsub++; - regnum++; - if (COMPILE_STACK_FULL) - { - ((compile_stack.stack) = - (compile_stack_elt_t *) realloc (compile_stack.stack, ( compile_stack.size << 1) * sizeof ( - compile_stack_elt_t))); - if (compile_stack.stack == 0) return REG_ESPACE; - - compile_stack.size <<= 1; - } - - if (*last_expression) - { - struct rexp_node * concat - = rx_mk_r_concat (&rxb->rx, *last_expression, 0); - if (!concat) - return REG_ESPACE; - *last_expression = concat; - last_expression = &concat->params.pair.right; - } - - /* - * These are the values to restore when we hit end of this - * group. - */ - COMPILE_STACK_TOP.top_expression = top_expression; - COMPILE_STACK_TOP.last_expression = last_expression; - COMPILE_STACK_TOP.regnum = regnum; - - compile_stack.avail++; - - top_expression = last_expression; - break; - - - case ')': - if (syntax & RE_NO_BK_PARENS) goto normal_backslash; - - handle_close: - /* See similar code for backslashed left paren above. */ - if (COMPILE_STACK_EMPTY) - if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD) - goto normal_char; - else - return REG_ERPAREN; - - /* Since we just checked for an empty stack above, this - ``can't happen''. */ - - { - /* We don't just want to restore into `regnum', because - later groups should continue to be numbered higher, - as in `(ab)c(de)' -- the second group is #2. */ - regnum_t this_group_regnum; - struct rexp_node ** inner = top_expression; - - compile_stack.avail--; - top_expression = COMPILE_STACK_TOP.top_expression; - last_expression = COMPILE_STACK_TOP.last_expression; - this_group_regnum = COMPILE_STACK_TOP.regnum; - { - int left_se = paramc; - int right_se = paramc + 1; - - params = (params - ? ((struct re_se_params *) - realloc (params, - (paramc + 2) * sizeof (params[0]))) - : ((struct re_se_params *) - malloc (2 * sizeof (params[0])))); - if (!params) - return REG_ESPACE; - paramc += 2; - - params[left_se].se = re_se_lparen; - params[left_se].op1 = this_group_regnum; - params[right_se].se = re_se_rparen; - params[right_se].op1 = this_group_regnum; - { - struct rexp_node * left - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)left_se); - struct rexp_node * right - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)right_se); - struct rexp_node * c1 - = (*inner - ? rx_mk_r_concat (&rxb->rx, left, *inner) : left); - struct rexp_node * c2 - = rx_mk_r_concat (&rxb->rx, c1, right); - if (!(left && right && c1 && c2)) - return REG_ESPACE; - *inner = c2; - } - } - break; - } - - case '|': /* `\|'. */ - if ((syntax & RE_LIMITED_OPS) || (syntax & RE_NO_BK_VBAR)) - goto normal_backslash; - handle_alt: - if (syntax & RE_LIMITED_OPS) - goto normal_char; - - { - struct rexp_node * alt - = rx_mk_r_alternate (&rxb->rx, *top_expression, 0); - if (!alt) - return REG_ESPACE; - *top_expression = alt; - last_expression = &alt->params.pair.right; - { - int sync_se = paramc; - - params = (params - ? ((struct re_se_params *) - realloc (params, - (paramc + 1) * sizeof (params[0]))) - : ((struct re_se_params *) - malloc (sizeof (params[0])))); - if (!params) - return REG_ESPACE; - ++paramc; - - params[sync_se].se = re_se_tv; - { - struct rexp_node * sync - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)sync_se); - struct rexp_node * conc - = rx_mk_r_concat (&rxb->rx, sync, 0); - - if (!sync || !conc) - return REG_ESPACE; - - *last_expression = conc; - last_expression = &conc->params.pair.right; - } - } - } - break; - - - case '{': - /* If \{ is a literal. */ - if (!(syntax & RE_INTERVALS) - /* If we're at `\{' and it's not the open-interval - operator. */ - || ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES)) - || (p - 2 == pattern && p == pend)) - goto normal_backslash; - - handle_interval: - { - /* If got here, then the syntax allows intervals. */ - - /* At least (most) this many matches must be made. */ - int lower_bound = -1, upper_bound = -1; - - beg_interval = p - 1; - - if (p == pend) - { - if (syntax & RE_NO_BK_BRACES) - goto unfetch_interval; - else - return REG_EBRACE; - } - - GET_UNSIGNED_NUMBER (lower_bound); - - if (c == ',') - { - GET_UNSIGNED_NUMBER (upper_bound); - if (upper_bound < 0) upper_bound = RE_DUP_MAX; - } - else - /* Interval such as `{1}' => match exactly once. */ - upper_bound = lower_bound; - - if (lower_bound < 0 || upper_bound > RE_DUP_MAX - || lower_bound > upper_bound) - { - if (syntax & RE_NO_BK_BRACES) - goto unfetch_interval; - else - return REG_BADBR; - } - - if (!(syntax & RE_NO_BK_BRACES)) - { - if (c != '\\') return REG_EBRACE; - PATFETCH (c); - } - - if (c != '}') - { - if (syntax & RE_NO_BK_BRACES) - goto unfetch_interval; - else - return REG_BADBR; - } - - /* We just parsed a valid interval. */ - - /* If it's invalid to have no preceding re. */ - if (pointless_if_repeated (*last_expression, params)) - { - if (syntax & RE_CONTEXT_INVALID_OPS) - return REG_BADRPT; - else if (!(syntax & RE_CONTEXT_INDEP_OPS)) - goto unfetch_interval; - /* was: else laststart = b; */ - } - - /* If the upper bound is zero, don't want to iterate - * at all. - */ - if (upper_bound == 0) - { - if (*last_expression) - { - rx_free_rexp (&rxb->rx, *last_expression); - *last_expression = 0; - } - } - else - /* Otherwise, we have a nontrivial interval. */ - { - int iter_se = paramc; - int end_se = paramc + 1; - params = (params - ? ((struct re_se_params *) - realloc (params, - sizeof (*params) * (2 + paramc))) - : ((struct re_se_params *) - malloc (2 * sizeof (*params)))); - if (!params) - return REG_ESPACE; - paramc += 2; - params [iter_se].se = re_se_iter; - params [iter_se].op1 = lower_bound; - params[iter_se].op2 = upper_bound; - - params[end_se].se = re_se_end_iter; - params[end_se].op1 = lower_bound; - params[end_se].op2 = upper_bound; - { - struct rexp_node * push0 - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)re_se_push0); - struct rexp_node * start_one_iter - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)iter_se); - struct rexp_node * phase1 - = rx_mk_r_concat (&rxb->rx, start_one_iter, - *last_expression); - struct rexp_node * pushback - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)re_se_pushback); - rx_Bitset cs = rx_cset (&rxb->rx); - struct rexp_node * lit_t - = rx_mk_r_cset (&rxb->rx, cs); - struct rexp_node * phase2 - = rx_mk_r_concat (&rxb->rx, pushback, lit_t); - struct rexp_node * loop - = rx_mk_r_2phase_star (&rxb->rx, phase1, phase2); - struct rexp_node * push_n_loop - = rx_mk_r_concat (&rxb->rx, push0, loop); - struct rexp_node * final_test - = rx_mk_r_side_effect (&rxb->rx, - (rx_side_effect)end_se); - struct rexp_node * full_exp - = rx_mk_r_concat (&rxb->rx, push_n_loop, final_test); - - if (!(push0 && start_one_iter && phase1 - && pushback && lit_t && phase2 - && loop && push_n_loop && final_test && full_exp)) - return REG_ESPACE; - - RX_bitset_enjoin(cs, 't'); - - *last_expression = full_exp; - } - } - beg_interval = 0; - } - break; - - unfetch_interval: - /* If an invalid interval, match the characters as literals. */ - p = beg_interval; - beg_interval = 0; - - /* normal_char and normal_backslash need `c'. */ - PATFETCH (c); - - if (!(syntax & RE_NO_BK_BRACES)) - { - if (p > pattern && p[-1] == '\\') - goto normal_backslash; - } - goto normal_char; - -#ifdef emacs - /* There is no way to specify the before_dot and after_dot - operators. rms says this is ok. --karl */ - case '=': - side = (rx_side_effect)rx_se_at_dot; - goto add_side_effect; - break; - - case 's': - case 'S': - { - rx_Bitset cs = rx_cset (&rxb->rx); - struct rexp_node * set = rx_mk_r_cset (&rxb->rx, cs); - if (!(cs && set)) - return REG_ESPACE; - if (c == 'S') - rx_bitset_universe (rxb->rx.local_cset_size, cs); - - PATFETCH (c); - { - int x; - enum syntaxcode code = syntax_spec_code [c]; - for (x = 0; x < 256; ++x) - { - - if (SYNTAX (x) == code) - { - rx_Bitset it = - inverse_translation (rxb, validate_inv_tr, - inverse_translate, - translate, x); - rx_bitset_xor (rxb->rx.local_cset_size, cs, it); - } - } - } - append = set; - goto append_node; - } - break; -#endif /* emacs */ - - - case 'w': - case 'W': - { - rx_Bitset cs = rx_cset (&rxb->rx); - struct rexp_node * n = (cs ? rx_mk_r_cset (&rxb->rx, cs) : 0); - if (!(cs && n)) - return REG_ESPACE; - if (c == 'W') - rx_bitset_universe (rxb->rx.local_cset_size ,cs); - { - int x; - for (x = rxb->rx.local_cset_size - 1; x > 0; --x) - if (SYNTAX(x) & Sword) - RX_bitset_toggle (cs, x); - } - append = n; - goto append_node; - } - break; - -/* With a little extra work, some of these side effects could be optimized - * away (basicly by looking at what we already know about the surrounding - * chars). - */ - case '<': - side = (rx_side_effect)re_se_wordbeg; - goto add_side_effect; - break; - - case '>': - side = (rx_side_effect)re_se_wordend; - goto add_side_effect; - break; - - case 'b': - side = (rx_side_effect)re_se_wordbound; - goto add_side_effect; - break; - - case 'B': - side = (rx_side_effect)re_se_notwordbound; - goto add_side_effect; - break; - - case '`': - side = (rx_side_effect)re_se_begbuf; - goto add_side_effect; - break; - - case '\'': - side = (rx_side_effect)re_se_endbuf; - goto add_side_effect; - break; - - add_side_effect: - { - struct rexp_node * se - = rx_mk_r_side_effect (&rxb->rx, side); - if (!se) - return REG_ESPACE; - append = se; - goto append_node; - } - break; - - case '1': case '2': case '3': case '4': case '5': - case '6': case '7': case '8': case '9': - if (syntax & RE_NO_BK_REFS) - goto normal_char; - - c1 = c - '0'; - - if (c1 > regnum) - return REG_ESUBREG; - - /* Can't back reference to a subexpression if inside of it. */ - if (group_in_compile_stack (compile_stack, c1)) - return REG_ESUBREG; - - { - int backref_se = paramc; - params = (params - ? ((struct re_se_params *) - realloc (params, - sizeof (*params) * (1 + paramc))) - : ((struct re_se_params *) - malloc (sizeof (*params)))); - if (!params) - return REG_ESPACE; - ++paramc; - params[backref_se].se = re_se_backref; - params[backref_se].op1 = c1; - side = (rx_side_effect)backref_se; - goto add_side_effect; - } - break; - - case '+': - case '?': - if (syntax & RE_BK_PLUS_QM) - goto handle_plus; - else - goto normal_backslash; - - default: - normal_backslash: - /* You might think it would be useful for \ to mean - not to translate; but if we don't translate it - it will never match anything. */ - c = TRANSLATE (c); - goto normal_char; - } - break; - - - default: - /* Expects the character in `c'. */ - normal_char: - { - rx_Bitset cs = rx_cset(&rxb->rx); - struct rexp_node * match = rx_mk_r_cset (&rxb->rx, cs); - rx_Bitset it; - if (!(cs && match)) - return REG_ESPACE; - it = inverse_translation (rxb, validate_inv_tr, - inverse_translate, translate, c); - rx_bitset_union (CHAR_SET_SIZE, cs, it); - append = match; - - append_node: - /* This genericly appends the rexp APPEND to *LAST_EXPRESSION - * and then parses the next character normally. - */ - if (*last_expression) - { - struct rexp_node * concat - = rx_mk_r_concat (&rxb->rx, *last_expression, append); - if (!concat) - return REG_ESPACE; - *last_expression = concat; - last_expression = &concat->params.pair.right; - } - else - *last_expression = append; - } - } /* switch (c) */ - } /* while p != pend */ - - - { - int win_se = paramc; - params = (params - ? ((struct re_se_params *) - realloc (params, - sizeof (*params) * (1 + paramc))) - : ((struct re_se_params *) - malloc (sizeof (*params)))); - if (!params) - return REG_ESPACE; - ++paramc; - params[win_se].se = re_se_win; - { - struct rexp_node * se - = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)win_se); - struct rexp_node * concat - = rx_mk_r_concat (&rxb->rx, rexp, se); - if (!(se && concat)) - return REG_ESPACE; - rexp = concat; - } - } - - - /* Through the pattern now. */ - - if (!COMPILE_STACK_EMPTY) - return REG_EPAREN; - - free (compile_stack.stack); - - orig_rexp = rexp; -#ifdef RX_DEBUG - if (rx_debug_compile) - { - dbug_rxb = rxb; - fputs ("\n\nCompiling ", stdout); - fwrite (pattern, 1, size, stdout); - fputs (":\n", stdout); - rxb->se_params = params; - print_rexp (&rxb->rx, orig_rexp, 2, re_seprint, stdout); - } -#endif - { - rx_Bitset cs = rx_cset(&rxb->rx); - rx_Bitset cs2 = rx_cset(&rxb->rx); - char * se_map = (char *) alloca (paramc); - struct rexp_node * new_rexp = 0; - - - bzero (se_map, paramc); - find_backrefs (se_map, rexp, params); - fewer_side_effects = - remove_unecessary_side_effects (&rxb->rx, se_map, - rx_copy_rexp (&rxb->rx, rexp), params); - - speed_up_alt (&rxb->rx, rexp, 0); - speed_up_alt (&rxb->rx, fewer_side_effects, 1); - - { - char * syntax_parens = rxb->syntax_parens; - if (syntax_parens == (char *)0x1) - rexp = remove_unecessary_side_effects - (&rxb->rx, se_map, rexp, params); - else if (syntax_parens) - { - int x; - for (x = 0; x < paramc; ++x) - if (( (params[x].se == re_se_lparen) - || (params[x].se == re_se_rparen)) - && (!syntax_parens [params[x].op1])) - se_map [x] = 1; - rexp = remove_unecessary_side_effects - (&rxb->rx, se_map, rexp, params); - } - } - - /* At least one more optimization would be nice to have here but i ran out - * of time. The idea would be to delay side effects. - * For examle, `(abc)' is the same thing as `abc()' except that the - * left paren is offset by 3 (which we know at compile time). - * (In this comment, write that second pattern `abc(:3:)' - * where `(:3:' is a syntactic unit.) - * - * Trickier: `(abc|defg)' is the same as `(abc(:3:|defg(:4:))' - * (The paren nesting may be hard to follow -- that's an alternation - * of `abc(:3:' and `defg(:4:' inside (purely syntactic) parens - * followed by the closing paren from the original expression.) - * - * Neither the expression tree representation nor the the nfa make - * this very easy to write. :( - */ - - /* What we compile is different than what the parser returns. - * Suppose the parser returns expression R. - * Let R' be R with unnecessary register assignments removed - * (see REMOVE_UNECESSARY_SIDE_EFFECTS, above). - * - * What we will compile is the expression: - * - * m{try}R{win}\|s{try}R'{win} - * - * {try} and {win} denote side effect epsilons (see EXPLORE_FUTURE). - * - * When trying a match, we insert an `m' at the beginning of the - * string if the user wants registers to be filled, `s' if not. - */ - new_rexp = - rx_mk_r_alternate - (&rxb->rx, - rx_mk_r_concat (&rxb->rx, rx_mk_r_cset (&rxb->rx, cs2), rexp), - rx_mk_r_concat (&rxb->rx, - rx_mk_r_cset (&rxb->rx, cs), fewer_side_effects)); - - if (!(new_rexp && cs && cs2)) - return REG_ESPACE; - RX_bitset_enjoin (cs2, '\0'); /* prefixed to the rexp used for matching. */ - RX_bitset_enjoin (cs, '\1'); /* prefixed to the rexp used for searching. */ - rexp = new_rexp; - } - -#ifdef RX_DEBUG - if (rx_debug_compile) - { - fputs ("\n...which is compiled as:\n", stdout); - print_rexp (&rxb->rx, rexp, 2, re_seprint, stdout); - } -#endif - { - struct rx_nfa_state *start = 0; - struct rx_nfa_state *end = 0; - - if (!rx_build_nfa (&rxb->rx, rexp, &start, &end)) - return REG_ESPACE; /* */ - else - { - void * mem = (void *)rxb->buffer; - unsigned long size = rxb->allocated; - int start_id; - char * perm_mem; - int iterator_size = paramc * sizeof (params[0]); - - end->is_final = 1; - start->is_start = 1; - rx_name_nfa_states (&rxb->rx); - start_id = start->id; -#ifdef RX_DEBUG - if (rx_debug_compile) - { - fputs ("...giving the NFA: \n", stdout); - dbug_rxb = rxb; - print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout); - } -#endif - if (!rx_eclose_nfa (&rxb->rx)) - return REG_ESPACE; - else - { - rx_delete_epsilon_transitions (&rxb->rx); - - /* For compatability reasons, we need to shove the - * compiled nfa into one chunk of malloced memory. - */ - rxb->rx.reserved = ( sizeof (params[0]) * paramc - + rx_sizeof_bitset (rxb->rx.local_cset_size)); -#ifdef RX_DEBUG - if (rx_debug_compile) - { - dbug_rxb = rxb; - fputs ("...which cooks down (uncompactified) to: \n", stdout); - print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout); - } -#endif - if (!rx_compactify_nfa (&rxb->rx, &mem, &size)) - return REG_ESPACE; - rxb->buffer = mem; - rxb->allocated = size; - rxb->rx.buffer = mem; - rxb->rx.allocated = size; - perm_mem = ((char *)rxb->rx.buffer - + rxb->rx.allocated - rxb->rx.reserved); - rxb->se_params = ((struct re_se_params *)perm_mem); - bcopy (params, rxb->se_params, iterator_size); - perm_mem += iterator_size; - rxb->fastset = (rx_Bitset) perm_mem; - rxb->start = rx_id_to_nfa_state (&rxb->rx, start_id); - } - rx_bitset_null (rxb->rx.local_cset_size, rxb->fastset); - rxb->can_match_empty = compute_fastset (rxb, orig_rexp); - rxb->match_regs_on_stack = - registers_on_stack (rxb, orig_rexp, 0, params); - rxb->search_regs_on_stack = - registers_on_stack (rxb, fewer_side_effects, 0, params); - if (rxb->can_match_empty) - rx_bitset_universe (rxb->rx.local_cset_size, rxb->fastset); - rxb->is_anchored = is_anchored (orig_rexp, (rx_side_effect) re_se_hat); - rxb->begbuf_only = is_anchored (orig_rexp, - (rx_side_effect) re_se_begbuf); - } - rx_free_rexp (&rxb->rx, rexp); - if (params) - free (params); -#ifdef RX_DEBUG - if (rx_debug_compile) - { - dbug_rxb = rxb; - fputs ("...which cooks down to: \n", stdout); - print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout); - } -#endif - } - return REG_NOERROR; -} - - - -/* This table gives an error message for each of the error codes listed - in regex.h. Obviously the order here has to be same as there. */ - -__const__ char * rx_error_msg[] = -{ 0, /* REG_NOERROR */ - "No match", /* REG_NOMATCH */ - "Invalid regular expression", /* REG_BADPAT */ - "Invalid collation character", /* REG_ECOLLATE */ - "Invalid character class name", /* REG_ECTYPE */ - "Trailing backslash", /* REG_EESCAPE */ - "Invalid back reference", /* REG_ESUBREG */ - "Unmatched [ or [^", /* REG_EBRACK */ - "Unmatched ( or \\(", /* REG_EPAREN */ - "Unmatched \\{", /* REG_EBRACE */ - "Invalid content of \\{\\}", /* REG_BADBR */ - "Invalid range end", /* REG_ERANGE */ - "Memory exhausted", /* REG_ESPACE */ - "Invalid preceding regular expression", /* REG_BADRPT */ - "Premature end of regular expression", /* REG_EEND */ - "Regular expression too big", /* REG_ESIZE */ - "Unmatched ) or \\)", /* REG_ERPAREN */ -}; - - - - -char rx_slowmap [256] = -{ - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -}; - -#ifdef __STDC__ -RX_DECL void -rx_blow_up_fastmap (struct re_pattern_buffer * rxb) -#else -RX_DECL void -rx_blow_up_fastmap (rxb) - struct re_pattern_buffer * rxb; -#endif -{ - int x; - for (x = 0; x < 256; ++x) /* &&&& 3.6 % */ - rxb->fastmap [x] = !!RX_bitset_member (rxb->fastset, x); - rxb->fastmap_accurate = 1; -} - - - - -#if !defined(REGEX_MALLOC) && !defined(__GNUC__) -#define RE_SEARCH_2_FN inner_re_search_2 -#define RE_S2_QUAL static -#else -#define RE_SEARCH_2_FN re_search_2 -#define RE_S2_QUAL -#endif - -struct re_search_2_closure -{ - __const__ unsigned char * string1; - int size1; - __const__ unsigned char * string2; - int size2; -}; - - -static __inline__ enum rx_get_burst_return -re_search_2_get_burst (pos, vclosure, stop) - struct rx_string_position * pos; - void * vclosure; - int stop; -{ - struct re_search_2_closure * closure; - closure = (struct re_search_2_closure *)vclosure; - if (!closure->string2) - { - int inset; - - inset = pos->pos - pos->string; - if ((inset < -1) || (inset > closure->size1)) - return rx_get_burst_no_more; - else - { - pos->pos = (__const__ unsigned char *) closure->string1 + inset; - pos->string = (__const__ unsigned char *) closure->string1; - pos->size = closure->size1; - pos->end = ((__const__ unsigned char *) - MIN(closure->string1 + closure->size1, - closure->string1 + stop)); - pos->offset = 0; - return ((pos->pos < pos->end) - ? rx_get_burst_ok - : rx_get_burst_no_more); - } - } - else if (!closure->string1) - { - int inset; - - inset = pos->pos - pos->string; - pos->pos = (__const__ unsigned char *) closure->string2 + inset; - pos->string = (__const__ unsigned char *) closure->string2; - pos->size = closure->size2; - pos->end = ((__const__ unsigned char *) - MIN(closure->string2 + closure->size2, - closure->string2 + stop)); - pos->offset = 0; - return ((pos->pos < pos->end) - ? rx_get_burst_ok - : rx_get_burst_no_more); - } - else - { - int inset; - - inset = pos->pos - pos->string + pos->offset; - if (inset < closure->size1) - { - pos->pos = (__const__ unsigned char *) closure->string1 + inset; - pos->string = (__const__ unsigned char *) closure->string1; - pos->size = closure->size1; - pos->end = ((__const__ unsigned char *) - MIN(closure->string1 + closure->size1, - closure->string1 + stop)); - pos->offset = 0; - return rx_get_burst_ok; - } - else - { - pos->pos = ((__const__ unsigned char *) - closure->string2 + inset - closure->size1); - pos->string = (__const__ unsigned char *) closure->string2; - pos->size = closure->size2; - pos->end = ((__const__ unsigned char *) - MIN(closure->string2 + closure->size2, - closure->string2 + stop - closure->size1)); - pos->offset = closure->size1; - return ((pos->pos < pos->end) - ? rx_get_burst_ok - : rx_get_burst_no_more); - } - } -} - - -static __inline__ enum rx_back_check_return -re_search_2_back_check (pos, lparen, rparen, translate, vclosure, stop) - struct rx_string_position * pos; - int lparen; - int rparen; - unsigned char * translate; - void * vclosure; - int stop; -{ - struct rx_string_position there; - struct rx_string_position past; - - there = *pos; - there.pos = there.string + lparen - there.offset; - re_search_2_get_burst (&there, vclosure, stop); - - past = *pos; - past.pos = past.string + rparen - there.offset; - re_search_2_get_burst (&past, vclosure, stop); - - ++pos->pos; - re_search_2_get_burst (pos, vclosure, stop); - - while ( (there.pos != past.pos) - && (pos->pos != pos->end)) - if (TRANSLATE(*there.pos) != TRANSLATE(*pos->pos)) - return rx_back_check_fail; - else - { - ++there.pos; - ++pos->pos; - if (there.pos == there.end) - re_search_2_get_burst (&there, vclosure, stop); - if (pos->pos == pos->end) - re_search_2_get_burst (pos, vclosure, stop); - } - - if (there.pos != past.pos) - return rx_back_check_fail; - --pos->pos; - re_search_2_get_burst (pos, vclosure, stop); - return rx_back_check_pass; -} - -static __inline__ int -re_search_2_fetch_char (pos, offset, app_closure, stop) - struct rx_string_position * pos; - int offset; - void * app_closure; - int stop; -{ - struct re_search_2_closure * closure; - closure = (struct re_search_2_closure *)app_closure; - if (offset == 0) - { - if (pos->pos >= pos->string) - return *pos->pos; - else - { - if ( (pos->string == closure->string2) - && (closure->string1) - && (closure->size1)) - return closure->string1[closure->size1 - 1]; - else - return 0; /* sure, why not. */ - } - } - if (pos->pos == pos->end) - return *closure->string2; - else - return pos->pos[1]; -} - - -#ifdef __STDC__ -RE_S2_QUAL int -RE_SEARCH_2_FN (struct re_pattern_buffer *rxb, - __const__ char * string1, int size1, - __const__ char * string2, int size2, - int startpos, int range, - struct re_registers *regs, - int stop) -#else -RE_S2_QUAL int -RE_SEARCH_2_FN (rxb, - string1, size1, string2, size2, startpos, range, regs, stop) - struct re_pattern_buffer *rxb; - __const__ char * string1; - int size1; - __const__ char * string2; - int size2; - int startpos; - int range; - struct re_registers *regs; - int stop; -#endif -{ - int answer; - struct re_search_2_closure closure; - closure.string1 = (__const__ unsigned char *) string1; - closure.size1 = size1; - closure.string2 = (__const__ unsigned char *) string2; - closure.size2 = size2; - answer = rx_search (rxb, startpos, range, stop, size1 + size2, - re_search_2_get_burst, - re_search_2_back_check, - re_search_2_fetch_char, - (void *)&closure, - regs, - 0, - 0); - switch (answer) - { - case rx_search_continuation: - abort (); - case rx_search_error: - return -2; - case rx_search_soft_fail: - case rx_search_fail: - return -1; - default: - return answer; - } -} - -/* Export rx_search to callers outside this file. */ - -int -re_rx_search (rxb, startpos, range, stop, total_size, - get_burst, back_check, fetch_char, - app_closure, regs, resume_state, save_state) - struct re_pattern_buffer * rxb; - int startpos; - int range; - int stop; - int total_size; - rx_get_burst_fn get_burst; - rx_back_check_fn back_check; - rx_fetch_char_fn fetch_char; - void * app_closure; - struct re_registers * regs; - struct rx_search_state * resume_state; - struct rx_search_state * save_state; -{ - return rx_search (rxb, startpos, range, stop, total_size, - get_burst, back_check, fetch_char, app_closure, - regs, resume_state, save_state); -} - -#if !defined(REGEX_MALLOC) && !defined(__GNUC__) -#ifdef __STDC__ -int -re_search_2 (struct re_pattern_buffer *rxb, - __const__ char * string1, int size1, - __const__ char * string2, int size2, - int startpos, int range, - struct re_registers *regs, - int stop) -#else -int -re_search_2 (rxb, string1, size1, string2, size2, startpos, range, regs, stop) - struct re_pattern_buffer *rxb; - __const__ char * string1; - int size1; - __const__ char * string2; - int size2; - int startpos; - int range; - struct re_registers *regs; - int stop; -#endif -{ - int ret; - ret = inner_re_search_2 (rxb, string1, size1, string2, size2, startpos, - range, regs, stop); - alloca (0); - return ret; -} -#endif - - -/* Like re_search_2, above, but only one string is specified, and - * doesn't let you say where to stop matching. - */ - -#ifdef __STDC__ -int -re_search (struct re_pattern_buffer * rxb, __const__ char *string, - int size, int startpos, int range, - struct re_registers *regs) -#else -int -re_search (rxb, string, size, startpos, range, regs) - struct re_pattern_buffer * rxb; - __const__ char * string; - int size; - int startpos; - int range; - struct re_registers *regs; -#endif -{ - return re_search_2 (rxb, 0, 0, string, size, startpos, range, regs, size); -} - -#ifdef __STDC__ -int -re_match_2 (struct re_pattern_buffer * rxb, - __const__ char * string1, int size1, - __const__ char * string2, int size2, - int pos, struct re_registers *regs, int stop) -#else -int -re_match_2 (rxb, string1, size1, string2, size2, pos, regs, stop) - struct re_pattern_buffer * rxb; - __const__ char * string1; - int size1; - __const__ char * string2; - int size2; - int pos; - struct re_registers *regs; - int stop; -#endif -{ - struct re_registers some_regs; - regoff_t start; - regoff_t end; - int srch; - int save = rxb->regs_allocated; - struct re_registers * regs_to_pass = regs; - - if (!regs) - { - some_regs.start = &start; - some_regs.end = &end; - some_regs.num_regs = 1; - regs_to_pass = &some_regs; - rxb->regs_allocated = REGS_FIXED; - } - - srch = re_search_2 (rxb, string1, size1, string2, size2, - pos, 1, regs_to_pass, stop); - if (regs_to_pass != regs) - rxb->regs_allocated = save; - if (srch < 0) - return srch; - return regs_to_pass->end[0] - regs_to_pass->start[0]; -} - -/* re_match is like re_match_2 except it takes only a single string. */ - -#ifdef __STDC__ -int -re_match (struct re_pattern_buffer * rxb, - __const__ char * string, - int size, int pos, - struct re_registers *regs) -#else -int -re_match (rxb, string, size, pos, regs) - struct re_pattern_buffer * rxb; - __const__ char *string; - int size; - int pos; - struct re_registers *regs; -#endif -{ - return re_match_2 (rxb, string, size, 0, 0, pos, regs, size); -} - - - -/* Set by `re_set_syntax' to the current regexp syntax to recognize. Can - also be assigned to arbitrarily: each pattern buffer stores its own - syntax, so it can be changed between regex compilations. */ -reg_syntax_t re_syntax_options = RE_SYNTAX_EMACS; - - -/* Specify the precise syntax of regexps for compilation. This provides - for compatibility for various utilities which historically have - different, incompatible syntaxes. - - The argument SYNTAX is a bit mask comprised of the various bits - defined in regex.h. We return the old syntax. */ - -#ifdef __STDC__ -reg_syntax_t -re_set_syntax (reg_syntax_t syntax) -#else -reg_syntax_t -re_set_syntax (syntax) - reg_syntax_t syntax; -#endif -{ - reg_syntax_t ret = re_syntax_options; - - re_syntax_options = syntax; - return ret; -} - - -/* Set REGS to hold NUM_REGS registers, storing them in STARTS and - ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use - this memory for recording register information. STARTS and ENDS - must be allocated using the malloc library routine, and must each - be at least NUM_REGS * sizeof (regoff_t) bytes long. - - If NUM_REGS == 0, then subsequent matches should allocate their own - register data. - - Unless this function is called, the first search or match using - PATTERN_BUFFER will allocate its own register data, without - freeing the old data. */ - -#ifdef __STDC__ -void -re_set_registers (struct re_pattern_buffer *bufp, - struct re_registers *regs, - unsigned num_regs, - regoff_t * starts, regoff_t * ends) -#else -void -re_set_registers (bufp, regs, num_regs, starts, ends) - struct re_pattern_buffer *bufp; - struct re_registers *regs; - unsigned num_regs; - regoff_t * starts; - regoff_t * ends; -#endif -{ - if (num_regs) - { - bufp->regs_allocated = REGS_REALLOCATE; - regs->num_regs = num_regs; - regs->start = starts; - regs->end = ends; - } - else - { - bufp->regs_allocated = REGS_UNALLOCATED; - regs->num_regs = 0; - regs->start = regs->end = (regoff_t) 0; - } -} - - - - -#ifdef __STDC__ -static int -cplx_se_sublist_len (struct rx_se_list * list) -#else -static int -cplx_se_sublist_len (list) - struct rx_se_list * list; -#endif -{ - int x = 0; - while (list) - { - if ((long)list->car >= 0) - ++x; - list = list->cdr; - } - return x; -} - - -/* For rx->se_list_cmp */ - -#ifdef __STDC__ -static int -posix_se_list_order (struct rx * rx, - struct rx_se_list * a, struct rx_se_list * b) -#else -static int -posix_se_list_order (rx, a, b) - struct rx * rx; - struct rx_se_list * a; - struct rx_se_list * b; -#endif -{ - int al = cplx_se_sublist_len (a); - int bl = cplx_se_sublist_len (b); - - if (!al && !bl) - return ((a == b) - ? 0 - : ((a < b) ? -1 : 1)); - - else if (!al) - return -1; - - else if (!bl) - return 1; - - else - { - rx_side_effect * av = ((rx_side_effect *) - alloca (sizeof (rx_side_effect) * (al + 1))); - rx_side_effect * bv = ((rx_side_effect *) - alloca (sizeof (rx_side_effect) * (bl + 1))); - struct rx_se_list * ap = a; - struct rx_se_list * bp = b; - int ai, bi; - - for (ai = al - 1; ai >= 0; --ai) - { - while ((long)ap->car < 0) - ap = ap->cdr; - av[ai] = ap->car; - ap = ap->cdr; - } - av[al] = (rx_side_effect)-2; - for (bi = bl - 1; bi >= 0; --bi) - { - while ((long)bp->car < 0) - bp = bp->cdr; - bv[bi] = bp->car; - bp = bp->cdr; - } - bv[bl] = (rx_side_effect)-1; - - { - int ret; - int x = 0; - while (av[x] == bv[x]) - ++x; - ret = (((unsigned *)(av[x]) < (unsigned *)(bv[x])) ? -1 : 1); - return ret; - } - } -} - - - - -/* re_compile_pattern is the GNU regular expression compiler: it - compiles PATTERN (of length SIZE) and puts the result in RXB. - Returns 0 if the pattern was valid, otherwise an error string. - - Assumes the `allocated' (and perhaps `buffer') and `translate' fields - are set in RXB on entry. - - We call rx_compile to do the actual compilation. */ - -#ifdef __STDC__ -__const__ char * -re_compile_pattern (__const__ char *pattern, - int length, - struct re_pattern_buffer * rxb) -#else -__const__ char * -re_compile_pattern (pattern, length, rxb) - __const__ char *pattern; - int length; - struct re_pattern_buffer * rxb; -#endif -{ - reg_errcode_t ret; - - /* GNU code is written to assume at least RE_NREGS registers will be set - (and at least one extra will be -1). */ - rxb->regs_allocated = REGS_UNALLOCATED; - - /* And GNU code determines whether or not to get register information - by passing null for the REGS argument to re_match, etc., not by - setting no_sub. */ - rxb->no_sub = 0; - - rxb->rx.local_cset_size = 256; - - /* Match anchors at newline. */ - rxb->newline_anchor = 1; - - rxb->re_nsub = 0; - rxb->start = 0; - rxb->se_params = 0; - rxb->rx.nodec = 0; - rxb->rx.epsnodec = 0; - rxb->rx.instruction_table = 0; - rxb->rx.nfa_states = 0; - rxb->rx.se_list_cmp = posix_se_list_order; - rxb->rx.start_set = 0; - - ret = rx_compile (pattern, length, re_syntax_options, rxb); - alloca (0); - return rx_error_msg[(int) ret]; -} - - - -#ifdef __STDC__ -int -re_compile_fastmap (struct re_pattern_buffer * rxb) -#else -int -re_compile_fastmap (rxb) - struct re_pattern_buffer * rxb; -#endif -{ - rx_blow_up_fastmap (rxb); - return 0; -} - - - - -/* Entry points compatible with 4.2 BSD regex library. We don't define - them if this is an Emacs or POSIX compilation. */ - -#if (!defined (emacs) && !defined (_POSIX_SOURCE)) || defined(USE_BSD_REGEX) - -/* BSD has one and only one pattern buffer. */ -static struct re_pattern_buffer rx_comp_buf; - -#ifdef __STDC__ -char * -re_comp (__const__ char *s) -#else -char * -re_comp (s) - __const__ char *s; -#endif -{ - reg_errcode_t ret; - - if (!s || (*s == '\0')) - { - if (!rx_comp_buf.buffer) - return "No previous regular expression"; - return 0; - } - - if (!rx_comp_buf.fastmap) - { - rx_comp_buf.fastmap = (char *) malloc (1 << CHARBITS); - if (!rx_comp_buf.fastmap) - return "Memory exhausted"; - } - - /* Since `rx_exec' always passes NULL for the `regs' argument, we - don't need to initialize the pattern buffer fields which affect it. */ - - /* Match anchors at newlines. */ - rx_comp_buf.newline_anchor = 1; - - rx_comp_buf.fastmap_accurate = 0; - rx_comp_buf.re_nsub = 0; - rx_comp_buf.start = 0; - rx_comp_buf.se_params = 0; - rx_comp_buf.rx.nodec = 0; - rx_comp_buf.rx.epsnodec = 0; - rx_comp_buf.rx.instruction_table = 0; - rx_comp_buf.rx.nfa_states = 0; - rx_comp_buf.rx.start = 0; - rx_comp_buf.rx.se_list_cmp = posix_se_list_order; - rx_comp_buf.rx.start_set = 0; - rx_comp_buf.rx.local_cset_size = 256; - - ret = rx_compile (s, strlen (s), re_syntax_options, &rx_comp_buf); - alloca (0); - - /* Yes, we're discarding `__const__' here. */ - return (char *) rx_error_msg[(int) ret]; -} - - -#ifdef __STDC__ -int -re_exec (__const__ char *s) -#else -int -re_exec (s) - __const__ char *s; -#endif -{ - __const__ int len = strlen (s); - return - 0 <= re_search (&rx_comp_buf, s, len, 0, len, (struct re_registers *) 0); -} -#endif /* not emacs and not _POSIX_SOURCE */ - - - -/* POSIX.2 functions. Don't define these for Emacs. */ - -#if !defined(emacs) - -/* regcomp takes a regular expression as a string and compiles it. - - PREG is a regex_t *. We do not expect any fields to be initialized, - since POSIX says we shouldn't. Thus, we set - - `buffer' to the compiled pattern; - `used' to the length of the compiled pattern; - `syntax' to RE_SYNTAX_POSIX_EXTENDED if the - REG_EXTENDED bit in CFLAGS is set; otherwise, to - RE_SYNTAX_POSIX_BASIC; - `newline_anchor' to REG_NEWLINE being set in CFLAGS; - `fastmap' and `fastmap_accurate' to zero; - `re_nsub' to the number of subexpressions in PATTERN. - - PATTERN is the address of the pattern string. - - CFLAGS is a series of bits which affect compilation. - - If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we - use POSIX basic syntax. - - If REG_NEWLINE is set, then . and [^...] don't match newline. - Also, regexec will try a match beginning after every newline. - - If REG_ICASE is set, then we considers upper- and lowercase - versions of letters to be equivalent when matching. - - If REG_NOSUB is set, then when PREG is passed to regexec, that - routine will report only success or failure, and nothing about the - registers. - - It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for - the return codes and their meanings.) */ - - -#ifdef __STDC__ -int -regcomp (regex_t * preg, __const__ char * pattern, int cflags) -#else -int -regcomp (preg, pattern, cflags) - regex_t * preg; - __const__ char * pattern; - int cflags; -#endif -{ - reg_errcode_t ret; - unsigned syntax - = cflags & REG_EXTENDED ? RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC; - - /* regex_compile will allocate the space for the compiled pattern. */ - preg->buffer = 0; - preg->allocated = 0; - preg->fastmap = malloc (256); - if (!preg->fastmap) - return REG_ESPACE; - preg->fastmap_accurate = 0; - - if (cflags & REG_ICASE) - { - unsigned i; - - preg->translate = (unsigned char *) malloc (256); - if (!preg->translate) - return (int) REG_ESPACE; - - /* Map uppercase characters to corresponding lowercase ones. */ - for (i = 0; i < CHAR_SET_SIZE; i++) - preg->translate[i] = isupper (i) ? tolower (i) : i; - } - else - preg->translate = 0; - - /* If REG_NEWLINE is set, newlines are treated differently. */ - if (cflags & REG_NEWLINE) - { /* REG_NEWLINE implies neither . nor [^...] match newline. */ - syntax &= ~RE_DOT_NEWLINE; - syntax |= RE_HAT_LISTS_NOT_NEWLINE; - /* It also changes the matching behavior. */ - preg->newline_anchor = 1; - } - else - preg->newline_anchor = 0; - - preg->no_sub = !!(cflags & REG_NOSUB); - - /* POSIX says a null character in the pattern terminates it, so we - can use strlen here in compiling the pattern. */ - preg->re_nsub = 0; - preg->start = 0; - preg->se_params = 0; - preg->syntax_parens = 0; - preg->rx.nodec = 0; - preg->rx.epsnodec = 0; - preg->rx.instruction_table = 0; - preg->rx.nfa_states = 0; - preg->rx.local_cset_size = 256; - preg->rx.start = 0; - preg->rx.se_list_cmp = posix_se_list_order; - preg->rx.start_set = 0; - ret = rx_compile (pattern, strlen (pattern), syntax, preg); - alloca (0); - - /* POSIX doesn't distinguish between an unmatched open-group and an - unmatched close-group: both are REG_EPAREN. */ - if (ret == REG_ERPAREN) ret = REG_EPAREN; - - return (int) ret; -} - - -/* regexec searches for a given pattern, specified by PREG, in the - string STRING. - - If NMATCH is zero or REG_NOSUB was set in the cflags argument to - `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at - least NMATCH elements, and we set them to the offsets of the - corresponding matched substrings. - - EFLAGS specifies `execution flags' which affect matching: if - REG_NOTBOL is set, then ^ does not match at the beginning of the - string; if REG_NOTEOL is set, then $ does not match at the end. - - We return 0 if we find a match and REG_NOMATCH if not. */ - -#ifdef __STDC__ -int -regexec (__const__ regex_t *preg, __const__ char *string, - size_t nmatch, regmatch_t pmatch[], - int eflags) -#else -int -regexec (preg, string, nmatch, pmatch, eflags) - __const__ regex_t *preg; - __const__ char *string; - size_t nmatch; - regmatch_t pmatch[]; - int eflags; -#endif -{ - int ret; - struct re_registers regs; - regex_t private_preg; - int len = strlen (string); - boolean want_reg_info = !preg->no_sub && nmatch > 0; - - private_preg = *preg; - - private_preg.not_bol = !!(eflags & REG_NOTBOL); - private_preg.not_eol = !!(eflags & REG_NOTEOL); - - /* The user has told us exactly how many registers to return - * information about, via `nmatch'. We have to pass that on to the - * matching routines. - */ - private_preg.regs_allocated = REGS_FIXED; - - if (want_reg_info) - { - regs.num_regs = nmatch; - regs.start = (( regoff_t *) malloc ((nmatch) * sizeof ( regoff_t))); - regs.end = (( regoff_t *) malloc ((nmatch) * sizeof ( regoff_t))); - if (regs.start == 0 || regs.end == 0) - return (int) REG_NOMATCH; - } - - /* Perform the searching operation. */ - ret = re_search (&private_preg, - string, len, - /* start: */ 0, - /* range: */ len, - want_reg_info ? ®s : (struct re_registers *) 0); - - /* Copy the register information to the POSIX structure. */ - if (want_reg_info) - { - if (ret >= 0) - { - unsigned r; - - for (r = 0; r < nmatch; r++) - { - pmatch[r].rm_so = regs.start[r]; - pmatch[r].rm_eo = regs.end[r]; - } - } - - /* If we needed the temporary register info, free the space now. */ - free (regs.start); - free (regs.end); - } - - /* We want zero return to mean success, unlike `re_search'. */ - return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH; -} - - -/* Returns a message corresponding to an error code, ERRCODE, returned - from either regcomp or regexec. */ - -#ifdef __STDC__ -size_t -regerror (int errcode, __const__ regex_t *preg, - char *errbuf, size_t errbuf_size) -#else -size_t -regerror (errcode, preg, errbuf, errbuf_size) - int errcode; - __const__ regex_t *preg; - char *errbuf; - size_t errbuf_size; -#endif -{ - __const__ char *msg - = rx_error_msg[errcode] == 0 ? "Success" : rx_error_msg[errcode]; - size_t msg_size = strlen (msg) + 1; /* Includes the 0. */ - - if (errbuf_size != 0) - { - if (msg_size > errbuf_size) - { - strncpy (errbuf, msg, errbuf_size - 1); - errbuf[errbuf_size - 1] = 0; - } - else - strcpy (errbuf, msg); - } - - return msg_size; -} - - -/* Free dynamically allocated space used by PREG. */ - -#ifdef __STDC__ -void -regfree (regex_t *preg) -#else -void -regfree (preg) - regex_t *preg; -#endif -{ - if (preg->buffer != 0) - free (preg->buffer); - preg->buffer = 0; - preg->allocated = 0; - - if (preg->fastmap != 0) - free (preg->fastmap); - preg->fastmap = 0; - preg->fastmap_accurate = 0; - - if (preg->translate != 0) - free (preg->translate); - preg->translate = 0; -} - -#endif /* not emacs */
deleted file mode 100644 --- a/lib/rx.h +++ /dev/null @@ -1,3732 +0,0 @@ -#if !defined(RXH) || defined(RX_WANT_SE_DEFS) -#define RXH - -/* Copyright (C) 1992, 1993 Free Software Foundation, Inc. - -This file is part of the librx library. - -Librx is free software; you can redistribute it and/or modify it under -the terms of the GNU Library General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -Librx is distributed in the hope that it will be useful, but WITHOUT -ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or -FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -for more details. - -You should have received a copy of the GNU Library General Public -License along with this software; see the file COPYING.LIB. If not, -write to the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ -/* t. lord Wed Sep 23 18:20:57 1992 */ - - - - - - - - -#ifndef RX_WANT_SE_DEFS - -/* This page: Bitsets */ - -#ifndef RX_subset -typedef unsigned int RX_subset; -#define RX_subset_bits (32) -#define RX_subset_mask (RX_subset_bits - 1) -#endif - -typedef RX_subset * rx_Bitset; - -#ifdef __STDC__ -typedef void (*rx_bitset_iterator) (void *, int member_index); -#else -typedef void (*rx_bitset_iterator) (); -#endif - -#define rx_bitset_subset(N) ((N) / RX_subset_bits) -#define rx_bitset_subset_val(B,N) ((B)[rx_bitset_subset(N)]) -#define RX_bitset_access(B,N,OP) \ - ((B)[rx_bitset_subset(N)] OP rx_subset_singletons[(N) & RX_subset_mask]) -#define RX_bitset_member(B,N) RX_bitset_access(B, N, &) -#define RX_bitset_enjoin(B,N) RX_bitset_access(B, N, |=) -#define RX_bitset_remove(B,N) RX_bitset_access(B, N, &= ~) -#define RX_bitset_toggle(B,N) RX_bitset_access(B, N, ^= ) -#define rx_bitset_numb_subsets(N) (((N) + RX_subset_bits - 1) / RX_subset_bits) -#define rx_sizeof_bitset(N) (rx_bitset_numb_subsets(N) * sizeof(RX_subset)) - - - -/* This page: Splay trees. */ - -#ifdef __STDC__ -typedef int (*rx_sp_comparer) (void * a, void * b); -#else -typedef int (*rx_sp_comparer) (); -#endif - -struct rx_sp_node -{ - void * key; - void * data; - struct rx_sp_node * kids[2]; -}; - -#ifdef __STDC__ -typedef void (*rx_sp_key_data_freer) (struct rx_sp_node *); -#else -typedef void (*rx_sp_key_data_freer) (); -#endif - - -/* giant inflatable hash trees */ - -struct rx_hash_item -{ - struct rx_hash_item * next_same_hash; - struct rx_hash * table; - unsigned long hash; - void * data; - void * binding; -}; - -struct rx_hash -{ - struct rx_hash * parent; - int refs; - struct rx_hash * children[13]; - struct rx_hash_item * buckets [13]; - int bucket_size [13]; -}; - -struct rx_hash_rules; - -#ifdef __STDC__ -/* should return like == */ -typedef int (*rx_hash_eq)(void *, void *); -typedef struct rx_hash * (*rx_alloc_hash)(struct rx_hash_rules *); -typedef void (*rx_free_hash)(struct rx_hash *, - struct rx_hash_rules *); -typedef struct rx_hash_item * (*rx_alloc_hash_item)(struct rx_hash_rules *, - void *); -typedef void (*rx_free_hash_item)(struct rx_hash_item *, - struct rx_hash_rules *); -#else -typedef int (*rx_hash_eq)(); -typedef struct rx_hash * (*rx_alloc_hash)(); -typedef void (*rx_free_hash)(); -typedef struct rx_hash_item * (*rx_alloc_hash_item)(); -typedef void (*rx_free_hash_item)(); -#endif - -struct rx_hash_rules -{ - rx_hash_eq eq; - rx_alloc_hash hash_alloc; - rx_free_hash free_hash; - rx_alloc_hash_item hash_item_alloc; - rx_free_hash_item free_hash_item; -}; - - -/* Forward declarations */ - -struct rx_cache; -struct rx_superset; -struct rx; -struct rx_se_list; - - - -/* - * GLOSSARY - * - * regexp - * regular expression - * expression - * pattern - a `regular' expression. The expression - * need not be formally regular -- it can contain - * constructs that don't correspond to purely regular - * expressions. - * - * buffer - * string - the string (or strings) being searched or matched. - * - * pattern buffer - a structure of type `struct re_pattern_buffer' - * This in turn contains a `struct rx', which holds the - * NFA compiled from a pattern, as well as some of the state - * of a matcher using the pattern. - * - * NFA - nondeterministic finite automata. Some people - * use this term to a member of the class of - * regular automata (those corresponding to a regular - * language). However, in this code, the meaning is - * more general. The automata used by Rx are comperable - * in power to what are usually called `push down automata'. - * - * Two NFA are built by rx for every pattern. One is built - * by the compiler. The other is built from the first, on - * the fly, by the matcher. The latter is called the `superstate - * NFA' because its states correspond to sets of states from - * the first NFA. (Joe Keane gets credit for the name - * `superstate NFA'). - * - * NFA edges - * epsilon edges - * side-effect edges - The NFA compiled from a pattern can have three - * kinds of edges. Epsilon edges can be taken freely anytime - * their source state is reached. Character set edges can be - * taken when their source state is reached and when the next - * character in the buffer is a member of the set. Side effect - * edges imply a transition that can only be taken after the - * indicated side effect has been successfully accomplished. - * Some examples of side effects are: - * - * Storing the current match position to record the - * location of a parentesized subexpression. - * - * Advancing the matcher over N characters if they - * match the N characters previously matched by a - * parentesized subexpression. - * - * Both of those kinds of edges occur in the NFA generated - * by the pattern: \(.\)\1 - * - * Epsilon and side effect edges are similar. Unfortunately, - * some of the code uses the name `epsilon edge' to mean - * both epsilon and side effect edges. For example, the - * function has_non_idempotent_epsilon_path computes the existance - * of a non-trivial path containing only a mix of epsilon and - * side effect edges. In that case `nonidempotent epsilon' is being - * used to mean `side effect'. - */ - - - - - -/* LOW LEVEL PATTERN BUFFERS */ - -/* Suppose that from some NFA state, more than one path through - * side-effect edges is possible. In what order should the paths - * be tried? A function of type rx_se_list_order answers that - * question. It compares two lists of side effects, and says - * which list comes first. - */ - -#ifdef __STDC__ -typedef int (*rx_se_list_order) (struct rx *, - struct rx_se_list *, - struct rx_se_list *); -#else -typedef int (*rx_se_list_order) (); -#endif - - - -/* Struct RX holds a compiled regular expression - that is, an nfa - * ready to be converted on demand to a more efficient superstate nfa. - * This is for the low level interface. The high-level interfaces enclose - * this in a `struct re_pattern_buffer'. - */ -struct rx -{ - /* The compiler assigns a unique id to every pattern. - * Like sequence numbers in X, there is a subtle bug here - * if you use Rx in a system that runs for a long time. - * But, because of the way the caches work out, it is almost - * impossible to trigger the Rx version of this bug. - * - * The id is used to validate superstates found in a cache - * of superstates. It isn't sufficient to let a superstate - * point back to the rx for which it was compiled -- the caller - * may be re-using a `struct rx' in which case the superstate - * is not really valid. So instead, superstates are validated - * by checking the sequence number of the pattern for which - * they were built. - */ - int rx_id; - - /* This is memory mgt. state for superstates. This may be - * shared by more than one struct rx. - */ - struct rx_cache * cache; - - /* Every regex defines the size of its own character set. - * A superstate has an array of this size, with each element - * a `struct rx_inx'. So, don't make this number too large. - * In particular, don't make it 2^16. - */ - int local_cset_size; - - /* After the NFA is built, it is copied into a contiguous region - * of memory (mostly for compatability with GNU regex). - * Here is that region, and it's size: - */ - void * buffer; - unsigned long allocated; - - /* Clients of RX can ask for some extra storage in the space pointed - * to by BUFFER. The field RESERVED is an input parameter to the - * compiler. After compilation, this much space will be available - * at (buffer + allocated - reserved) - */ - unsigned long reserved; - - /* --------- The remaining fields are for internal use only. --------- */ - /* --------- But! they must be initialized to 0. --------- */ - - /* NODEC is the number of nodes in the NFA with non-epsilon - * transitions. - */ - int nodec; - - /* EPSNODEC is the number of nodes with only epsilon transitions. */ - int epsnodec; - - /* The sum (NODEC + EPSNODEC) is the total number of states in the - * compiled NFA. - */ - - /* Lists of side effects as stored in the NFA are `hash consed'..meaning - * that lists with the same elements are ==. During compilation, - * this table facilitates hash-consing. - */ - struct rx_hash se_list_memo; - - /* Lists of NFA states are also hashed. - */ - struct rx_hash set_list_memo; - - - - - /* The compiler and matcher must build a number of instruction frames. - * The format of these frames is fixed (c.f. struct rx_inx). The values - * of the instructions is not fixed. - * - * An enumerated type (enum rx_opcode) defines the set of instructions - * that the compiler or matcher might generate. When filling an instruction - * frame, the INX field is found by indexing this instruction table - * with an opcode: - */ - void ** instruction_table; - - /* The list of all states in an NFA. - * During compilation, the NEXT field of NFA states links this list. - * After compilation, all the states are compacted into an array, - * ordered by state id numbers. At that time, this points to the base - * of that array. - */ - struct rx_nfa_state *nfa_states; - - /* Every nfa begins with one distinguished starting state: - */ - struct rx_nfa_state *start; - - /* This orders the search through super-nfa paths. - * See the comment near the typedef of rx_se_list_order. - */ - rx_se_list_order se_list_cmp; - - struct rx_superset * start_set; -}; - - - - -/* SYNTAX TREES */ - -/* Compilation is in stages. - * - * In the first stage, a pattern specified by a string is - * translated into a syntax tree. Later stages will convert - * the syntax tree into an NFA optimized for conversion to a - * superstate-NFA. - * - * This page is about syntax trees. - */ - -enum rexp_node_type -{ - r_cset, /* Match from a character set. `a' or `[a-z]'*/ - r_concat, /* Concat two subexpressions. `ab' */ - r_alternate, /* Choose one of two subexpressions. `a\|b' */ - r_opt, /* Optional subexpression. `a?' */ - r_star, /* Repeated subexpression. `a*' */ - - - /* A 2phase-star is a variation on a repeated subexpression. - * In this case, there are two subexpressions. The first, if matched, - * begins a repitition (otherwise, the whole expression is matches the - * empth string). - * - * After matching the first subexpression, a 2phase star either finishes, - * or matches the second subexpression. If the second subexpression is - * matched, then the whole construct repeats. - * - * 2phase stars are used in two circumstances. First, they - * are used as part of the implementation of POSIX intervals (counted - * repititions). Second, they are used to implement proper star - * semantics when the repeated subexpression contains paths of - * only side effects. See rx_compile for more information. - */ - r_2phase_star, - - - /* c.f. "typedef void * rx_side_effect" */ - r_side_effect, - - /* This is an extension type: It is for transient use in source->source - * transformations (implemented over syntax trees). - */ - r_data -}; - -/* A side effect is a matcher-specific action associated with - * transitions in the NFA. The details of side effects are up - * to the matcher. To the compiler and superstate constructors - * side effects are opaque: - */ - -typedef void * rx_side_effect; - -/* Nodes in a syntax tree are of this type: - */ -struct rexp_node -{ - enum rexp_node_type type; - union - { - rx_Bitset cset; - rx_side_effect side_effect; - struct - { - struct rexp_node *left; - struct rexp_node *right; - } pair; - void * data; - } params; -}; - - - -/* NFA - * - * A syntax tree is compiled into an NFA. This page defines the structure - * of that NFA. - */ - -struct rx_nfa_state -{ - /* These are kept in a list as the NFA is being built. */ - struct rx_nfa_state *next; - - /* After the NFA is built, states are given integer id's. - * States whose outgoing transitions are all either epsilon or - * side effect edges are given ids less than 0. Other states - * are given successive non-negative ids starting from 0. - */ - int id; - - /* The list of NFA edges that go from this state to some other. */ - struct rx_nfa_edge *edges; - - /* If you land in this state, then you implicitly land - * in all other states reachable by only epsilon translations. - * Call the set of maximal paths to such states the epsilon closure - * of this state. - * - * There may be other states that are reachable by a mixture of - * epsilon and side effect edges. Consider the set of maximal paths - * of that sort from this state. Call it the epsilon-side-effect - * closure of the state. - * - * The epsilon closure of the state is a subset of the epsilon-side- - * effect closure. It consists of all the paths that contain - * no side effects -- only epsilon edges. - * - * The paths in the epsilon-side-effect closure can be partitioned - * into equivalance sets. Two paths are equivalant if they have the - * same set of side effects, in the same order. The epsilon-closure - * is one of these equivalance sets. Let's call these equivalance - * sets: observably equivalant path sets. That name is chosen - * because equivalance of two paths means they cause the same side - * effects -- so they lead to the same subsequent observations other - * than that they may wind up in different target states. - * - * The superstate nfa, which is derived from this nfa, is based on - * the observation that all of the paths in an observably equivalant - * path set can be explored at the same time, provided that the - * matcher keeps track not of a single nfa state, but of a set of - * states. In particular, after following all the paths in an - * observably equivalant set, you wind up at a set of target states. - * That set of target states corresponds to one state in the - * superstate NFA. - * - * Staticly, before matching begins, it is convenient to analyze the - * nfa. Each state is labeled with a list of the observably - * equivalant path sets who's union covers all the - * epsilon-side-effect paths beginning in this state. This list is - * called the possible futures of the state. - * - * A trivial example is this NFA: - * s1 - * A ---> B - * - * s2 - * ---> C - * - * epsilon s1 - * ---------> D ------> E - * - * - * In this example, A has two possible futures. - * One invokes the side effect `s1' and contains two paths, - * one ending in state B, the other in state E. - * The other invokes the side effect `s2' and contains only - * one path, landing in state C. - */ - struct rx_possible_future *futures; - - - /* There are exactly two distinguished states in every NFA: */ - unsigned int is_final:1; - unsigned int is_start:1; - - /* These are used during NFA construction... */ - unsigned int eclosure_needed:1; - unsigned int mark:1; -}; - - -/* An edge in an NFA is typed: */ -enum rx_nfa_etype -{ - /* A cset edge is labled with a set of characters one of which - * must be matched for the edge to be taken. - */ - ne_cset, - - /* An epsilon edge is taken whenever its starting state is - * reached. - */ - ne_epsilon, - - /* A side effect edge is taken whenever its starting state is - * reached. Side effects may cause the match to fail or the - * position of the matcher to advance. - */ - ne_side_effect /* A special kind of epsilon. */ -}; - -struct rx_nfa_edge -{ - struct rx_nfa_edge *next; - enum rx_nfa_etype type; - struct rx_nfa_state *dest; - union - { - rx_Bitset cset; - rx_side_effect side_effect; - } params; -}; - - - -/* A possible future consists of a list of side effects - * and a set of destination states. Below are their - * representations. These structures are hash-consed which - * means that lists with the same elements share a representation - * (their addresses are ==). - */ - -struct rx_nfa_state_set -{ - struct rx_nfa_state * car; - struct rx_nfa_state_set * cdr; -}; - -struct rx_se_list -{ - rx_side_effect car; - struct rx_se_list * cdr; -}; - -struct rx_possible_future -{ - struct rx_possible_future *next; - struct rx_se_list * effects; - struct rx_nfa_state_set * destset; -}; - - - -/* This begins the description of the superstate NFA. - * - * The superstate NFA corresponds to the NFA in these ways: - * - * Every superstate NFA states SUPER correspond to sets of NFA states, - * nfa_states(SUPER). - * - * Superstate edges correspond to NFA paths. - * - * The superstate has no epsilon transitions; - * every edge has a character label, and a (possibly empty) side - * effect label. The side effect label corresponds to a list of - * side effects that occur in the NFA. These parts are referred - * to as: superedge_character(EDGE) and superedge_sides(EDGE). - * - * For a superstate edge EDGE starting in some superstate SUPER, - * the following is true (in pseudo-notation :-): - * - * exists DEST in nfa_states s.t. - * exists nfaEDGE in nfa_edges s.t. - * origin (nfaEDGE) == DEST - * && origin (nfaEDGE) is a member of nfa_states(SUPER) - * && exists PF in possible_futures(dest(nfaEDGE)) s.t. - * sides_of_possible_future (PF) == superedge_sides (EDGE) - * - * also: - * - * let SUPER2 := superedge_destination(EDGE) - * nfa_states(SUPER2) - * == union of all nfa state sets S s.t. - * exists PF in possible_futures(dest(nfaEDGE)) s.t. - * sides_of_possible_future (PF) == superedge_sides (EDGE) - * && S == dests_of_possible_future (PF) } - * - * Or in english, every superstate is a set of nfa states. A given - * character and a superstate implies many transitions in the NFA -- - * those that begin with an edge labeled with that character from a - * state in the set corresponding to the superstate. - * - * The destinations of those transitions each have a set of possible - * futures. A possible future is a list of side effects and a set of - * destination NFA states. Two sets of possible futures can be - * `merged' by combining all pairs of possible futures that have the - * same side effects. A pair is combined by creating a new future - * with the same side effect but the union of the two destination sets. - * In this way, all the possible futures suggested by a superstate - * and a character can be merged into a set of possible futures where - * no two elements of the set have the same set of side effects. - * - * The destination of a possible future, being a set of NFA states, - * corresponds to a supernfa state. So, the merged set of possible - * futures we just created can serve as a set of edges in the - * supernfa. - * - * The representation of the superstate nfa and the nfa is critical. - * The nfa has to be compact, but has to facilitate the rapid - * computation of missing superstates. The superstate nfa has to - * be fast to interpret, lazilly constructed, and bounded in space. - * - * To facilitate interpretation, the superstate data structures are - * peppered with `instruction frames'. There is an instruction set - * defined below which matchers using the supernfa must be able to - * interpret. - * - * We'd like to make it possible but not mandatory to use code - * addresses to represent instructions (c.f. gcc's computed goto). - * Therefore, we define an enumerated type of opcodes, and when - * writing one of these instructions into a data structure, use - * the opcode as an index into a table of instruction values. - * - * Here are the opcodes that occur in the superstate nfa: - */ - - -/* Every superstate contains a table of instruction frames indexed - * by characters. A normal `move' in a matcher is to fetch the next - * character and use it as an index into a superstates transition - * table. - * - * In the fasted case, only one edge follows from that character. - * In other cases there is more work to do. - * - * The descriptions of the opcodes refer to data structures that are - * described further below. - */ - -enum rx_opcode -{ - /* - * BACKTRACK_POINT is invoked when a character transition in - * a superstate leads to more than one edge. In that case, - * the edges have to be explored independently using a backtracking - * strategy. - * - * A BACKTRACK_POINT instruction is stored in a superstate's - * transition table for some character when it is known that that - * character crosses more than one edge. On encountering this - * instruction, the matcher saves enough state to backtrack to this - * point in the match later. - */ - rx_backtrack_point = 0, /* data is (struct transition_class *) */ - - /* - * RX_DO_SIDE_EFFECTS evaluates the side effects of an epsilon path. - * There is one occurence of this instruction per rx_distinct_future. - * This instruction is skipped if a rx_distinct_future has no side effects. - */ - rx_do_side_effects = rx_backtrack_point + 1, - - /* data is (struct rx_distinct_future *) */ - - /* - * RX_CACHE_MISS instructions are stored in rx_distinct_futures whose - * destination superstate has been reclaimed (or was never built). - * It recomputes the destination superstate. - * RX_CACHE_MISS is also stored in a superstate transition table before - * any of its edges have been built. - */ - rx_cache_miss = rx_do_side_effects + 1, - /* data is (struct rx_distinct_future *) */ - - /* - * RX_NEXT_CHAR is called to consume the next character and take the - * corresponding transition. This is the only instruction that uses - * the DATA field of the instruction frame instead of DATA_2. - * (see EXPLORE_FUTURE in regex.c). - */ - rx_next_char = rx_cache_miss + 1, /* data is (struct superstate *) */ - - /* RX_BACKTRACK indicates that a transition fails. - */ - rx_backtrack = rx_next_char + 1, /* no data */ - - /* - * RX_ERROR_INX is stored only in places that should never be executed. - */ - rx_error_inx = rx_backtrack + 1, /* Not supposed to occur. */ - - rx_num_instructions = rx_error_inx + 1 -}; - -/* An id_instruction_table holds the values stored in instruction - * frames. The table is indexed by the enums declared above. - */ -extern void * rx_id_instruction_table[rx_num_instructions]; - -/* The heart of the matcher is a `word-code-interpreter' - * (like a byte-code interpreter, except that instructions - * are a full word wide). - * - * Instructions are not stored in a vector of code, instead, - * they are scattered throughout the data structures built - * by the regexp compiler and the matcher. One word-code instruction, - * together with the arguments to that instruction, constitute - * an instruction frame (struct rx_inx). - * - * This structure type is padded by hand to a power of 2 because - * in one of the dominant cases, we dispatch by indexing a table - * of instruction frames. If that indexing can be accomplished - * by just a shift of the index, we're happy. - * - * Instructions take at most one argument, but there are two - * slots in an instruction frame that might hold that argument. - * These are called data and data_2. The data slot is only - * used for one instruction (RX_NEXT_CHAR). For all other - * instructions, data should be set to 0. - * - * RX_NEXT_CHAR is the most important instruction by far. - * By reserving the data field for its exclusive use, - * instruction dispatch is sped up in that case. There is - * no need to fetch both the instruction and the data, - * only the data is needed. In other words, a `cycle' begins - * by fetching the field data. If that is non-0, then it must - * be the destination state of a next_char transition, so - * make that value the current state, advance the match position - * by one character, and start a new cycle. On the other hand, - * if data is 0, fetch the instruction and do a more complicated - * dispatch on that. - */ - -struct rx_inx -{ - void * data; - void * data_2; - void * inx; - void * fnord; -}; - -#ifndef RX_TAIL_ARRAY -#define RX_TAIL_ARRAY 1 -#endif - -/* A superstate corresponds to a set of nfa states. Those sets are - * represented by STRUCT RX_SUPERSET. The constructors - * guarantee that only one (shared) structure is created for a given set. - */ -struct rx_superset -{ - int refs; /* This is a reference counted structure. */ - - /* We keep these sets in a cache because (in an unpredictable way), - * the same set is often created again and again. But that is also - * problematic -- compatibility with POSIX and GNU regex requires - * that we not be able to tell when a program discards a particular - * NFA (thus invalidating the supersets created from it). - * - * But when a cache hit appears to occur, we will have in hand the - * nfa for which it may have happened. That is why every nfa is given - * its own sequence number. On a cache hit, the cache is validated - * by comparing the nfa sequence number to this field: - */ - int id; - - struct rx_nfa_state * car; /* May or may not be a valid addr. */ - struct rx_superset * cdr; - - /* If the corresponding superstate exists: */ - struct rx_superstate * superstate; - - - /* There is another bookkeeping problem. It is expensive to - * compute the starting nfa state set for an nfa. So, once computed, - * it is cached in the `struct rx'. - * - * But, the state set can be flushed from the superstate cache. - * When that happens, we can't know if the corresponding `struct rx' - * is still alive or if it has been freed or re-used by the program. - * So, the cached pointer to this set in a struct rx might be invalid - * and we need a way to validate it. - * - * Fortunately, even if this set is flushed from the cache, it is - * not freed. It just goes on the free-list of supersets. - * So we can still examine it. - * - * So to validate a starting set memo, check to see if the - * starts_for field still points back to the struct rx in question, - * and if the ID matches the rx sequence number. - */ - struct rx * starts_for; - - /* This is used to link into a hash bucket so these objects can - * be `hash-consed'. - */ - struct rx_hash_item hash_item; -}; - -#define rx_protect_superset(RX,CON) (++(CON)->refs) - -/* The terminology may be confusing (rename this structure?). - * Every character occurs in at most one rx_super_edge per super-state. - * But, that structure might have more than one option, indicating a point - * of non-determinism. - * - * In other words, this structure holds a list of superstate edges - * sharing a common starting state and character label. The edges - * are in the field OPTIONS. All superstate edges sharing the same - * starting state and character are in this list. - */ -struct rx_super_edge -{ - struct rx_super_edge *next; - struct rx_inx rx_backtrack_frame; - int cset_size; - rx_Bitset cset; - struct rx_distinct_future *options; -}; - -/* A superstate is a set of nfa states (RX_SUPERSET) along - * with a transition table. Superstates are built on demand and reclaimed - * without warning. To protect a superstate from this ghastly fate, - * use LOCK_SUPERSTATE. - */ -struct rx_superstate -{ - int rx_id; /* c.f. the id field of rx_superset */ - int locks; /* protection from reclamation */ - - /* Within a superstate cache, all the superstates are kept in a big - * queue. The tail of the queue is the state most likely to be - * reclaimed. The *recyclable fields hold the queue position of - * this state. - */ - struct rx_superstate * next_recyclable; - struct rx_superstate * prev_recyclable; - - /* The supernfa edges that exist in the cache and that have - * this state as their destination are kept in this list: - */ - struct rx_distinct_future * transition_refs; - - /* The list of nfa states corresponding to this superstate: */ - struct rx_superset * contents; - - /* The list of edges in the cache beginning from this state. */ - struct rx_super_edge * edges; - - /* A tail of the recyclable queue is marked as semifree. A semifree - * state has no incoming next_char transitions -- any transition - * into a semifree state causes a complex dispatch with the side - * effect of rescuing the state from its semifree state. - * - * An alternative to this might be to make next_char more expensive, - * and to move a state to the head of the recyclable queue whenever - * it is entered. That way, popular states would never be recycled. - * - * But unilaterally making next_char more expensive actually loses. - * So, incoming transitions are only made expensive for states near - * the tail of the recyclable queue. The more cache contention - * there is, the more frequently a state will have to prove itself - * and be moved back to the front of the queue. If there is less - * contention, then popular states just aggregate in the front of - * the queue and stay there. - */ - int is_semifree; - - - /* This keeps track of the size of the transition table for this - * state. There is a half-hearted attempt to support variable sized - * superstates. - */ - int trans_size; - - /* Indexed by characters... */ - struct rx_inx transitions[RX_TAIL_ARRAY]; -}; - - -/* A list of distinct futures define the edges that leave from a - * given superstate on a given character. c.f. rx_super_edge. - */ - -struct rx_distinct_future -{ - struct rx_distinct_future * next_same_super_edge[2]; - struct rx_distinct_future * next_same_dest; - struct rx_distinct_future * prev_same_dest; - struct rx_superstate * present; /* source state */ - struct rx_superstate * future; /* destination state */ - struct rx_super_edge * edge; - - - /* The future_frame holds the instruction that should be executed - * after all the side effects are done, when it is time to complete - * the transition to the next state. - * - * Normally this is a next_char instruction, but it may be a - * cache_miss instruction as well, depending on whether or not - * the superstate is in the cache and semifree. - * - * If this is the only future for a given superstate/char, and - * if there are no side effects to be performed, this frame is - * not used (directly) at all. Instead, its contents are copied - * into the transition table of the starting state of this dist. future. - */ - struct rx_inx future_frame; - - struct rx_inx side_effects_frame; - struct rx_se_list * effects; -}; - -#define rx_lock_superstate(R,S) ((S)->locks++) -#define rx_unlock_superstate(R,S) (--(S)->locks) - - -/* This page destined for rx.h */ - -struct rx_blocklist -{ - struct rx_blocklist * next; - int bytes; -}; - -struct rx_freelist -{ - struct rx_freelist * next; -}; - -struct rx_cache; - -#ifdef __STDC__ -typedef void (*rx_morecore_fn)(struct rx_cache *); -#else -typedef void (*rx_morecore_fn)(); -#endif - -/* You use this to control the allocation of superstate data - * during matching. Most of it should be initialized to 0. - * - * A MORECORE function is necessary. It should allocate - * a new block of memory or return 0. - * A default that uses malloc is called `rx_morecore'. - * - * The number of SUPERSTATES_ALLOWED indirectly limits how much memory - * the system will try to allocate. The default is 128. Batch style - * applications that are very regexp intensive should use as high a number - * as possible without thrashing. - * - * The LOCAL_CSET_SIZE is the number of characters in a character set. - * It is therefore the number of entries in a superstate transition table. - * Generally, it should be 256. If your character set has 16 bits, - * it is better to translate your regexps into equivalent 8 bit patterns. - */ - -struct rx_cache -{ - struct rx_hash_rules superset_hash_rules; - - /* Objects are allocated by incrementing a pointer that - * scans across rx_blocklists. - */ - struct rx_blocklist * memory; - struct rx_blocklist * memory_pos; - int bytes_left; - char * memory_addr; - rx_morecore_fn morecore; - - /* Freelists. */ - struct rx_freelist * free_superstates; - struct rx_freelist * free_transition_classes; - struct rx_freelist * free_discernable_futures; - struct rx_freelist * free_supersets; - struct rx_freelist * free_hash; - - /* Two sets of superstates -- those that are semifreed, and those - * that are being used. - */ - struct rx_superstate * lru_superstate; - struct rx_superstate * semifree_superstate; - - struct rx_superset * empty_superset; - - int superstates; - int semifree_superstates; - int hits; - int misses; - int superstates_allowed; - - int local_cset_size; - void ** instruction_table; - - struct rx_hash superset_table; -}; - - - -/* The lowest-level search function supports arbitrarily fragmented - * strings and (optionally) suspendable/resumable searches. - * - * Callers have to provide a few hooks. - */ - -#ifndef __GNUC__ -#ifdef __STDC__ -#define __const__ const -#else -#define __const__ -#endif -#endif - -/* This holds a matcher position */ -struct rx_string_position -{ - __const__ unsigned char * pos; /* The current pos. */ - __const__ unsigned char * string; /* The current string burst. */ - __const__ unsigned char * end; /* First invalid position >= POS. */ - int offset; /* Integer address of the current burst. */ - int size; /* Current string's size. */ - int search_direction; /* 1 or -1 */ - int search_end; /* First position to not try. */ -}; - - -enum rx_get_burst_return -{ - rx_get_burst_continuation, - rx_get_burst_error, - rx_get_burst_ok, - rx_get_burst_no_more -}; - - -/* A call to get burst should make POS valid. It might be invalid - * if the STRING field doesn't point to a burst that actually - * contains POS. - * - * GET_BURST should take a clue from SEARCH_DIRECTION (1 or -1) as to - * whether or not to pad to the left. Padding to the right is always - * appropriate, but need not go past the point indicated by STOP. - * - * If a continuation is returned, then the reentering call to - * a search function will retry the get_burst. - */ - -#ifdef __STDC__ -typedef enum rx_get_burst_return - (*rx_get_burst_fn) (struct rx_string_position * pos, - void * app_closure, - int stop); - -#else -typedef enum rx_get_burst_return (*rx_get_burst_fn) (); -#endif - - -enum rx_back_check_return -{ - rx_back_check_continuation, - rx_back_check_error, - rx_back_check_pass, - rx_back_check_fail -}; - -/* Back_check should advance the position it is passed - * over rparen - lparen characters and return pass iff - * the characters starting at POS match those indexed - * by [LPAREN..RPAREN]. - * - * If a continuation is returned, then the reentering call to - * a search function will retry the back_check. - */ - -#ifdef __STDC__ -typedef enum rx_back_check_return - (*rx_back_check_fn) (struct rx_string_position * pos, - int lparen, - int rparen, - unsigned char * translate, - void * app_closure, - int stop); - -#else -typedef enum rx_back_check_return (*rx_back_check_fn) (); -#endif - - - - -/* A call to fetch_char should return the character at POS or POS + 1. - * Returning continuations here isn't supported. OFFSET is either 0 or 1 - * and indicates which characters is desired. - */ - -#ifdef __STDC__ -typedef int (*rx_fetch_char_fn) (struct rx_string_position * pos, - int offset, - void * app_closure, - int stop); -#else -typedef int (*rx_fetch_char_fn) (); -#endif - - -enum rx_search_return -{ - rx_search_continuation = -4, - rx_search_error = -3, - rx_search_soft_fail = -2, /* failed by running out of string */ - rx_search_fail = -1 /* failed only by reaching failure states */ - /* return values >= 0 indicate the position of a successful match */ -}; - - - - - - -/* regex.h - * - * The remaining declarations replace regex.h. - */ - -/* This is an array of error messages corresponding to the error codes. - */ -extern __const__ char *re_error_msg[]; - -/* If any error codes are removed, changed, or added, update the - `re_error_msg' table in regex.c. */ -typedef enum -{ - REG_NOERROR = 0, /* Success. */ - REG_NOMATCH, /* Didn't find a match (for regexec). */ - - /* POSIX regcomp return error codes. (In the order listed in the - standard.) */ - REG_BADPAT, /* Invalid pattern. */ - REG_ECOLLATE, /* Not implemented. */ - REG_ECTYPE, /* Invalid character class name. */ - REG_EESCAPE, /* Trailing backslash. */ - REG_ESUBREG, /* Invalid back reference. */ - REG_EBRACK, /* Unmatched left bracket. */ - REG_EPAREN, /* Parenthesis imbalance. */ - REG_EBRACE, /* Unmatched \{. */ - REG_BADBR, /* Invalid contents of \{\}. */ - REG_ERANGE, /* Invalid range end. */ - REG_ESPACE, /* Ran out of memory. */ - REG_BADRPT, /* No preceding re for repetition op. */ - - /* Error codes we've added. */ - REG_EEND, /* Premature end. */ - REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */ - REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */ -} reg_errcode_t; - -/* The regex.c support, as a client of rx, defines a set of possible - * side effects that can be added to the edge lables of nfa edges. - * Here is the list of sidef effects in use. - */ - -enum re_side_effects -{ -#define RX_WANT_SE_DEFS 1 -#undef RX_DEF_SE -#undef RX_DEF_CPLX_SE -#define RX_DEF_SE(IDEM, NAME, VALUE) NAME VALUE, -#define RX_DEF_CPLX_SE(IDEM, NAME, VALUE) NAME VALUE, -#include "rx.h" -#undef RX_DEF_SE -#undef RX_DEF_CPLX_SE -#undef RX_WANT_SE_DEFS - re_floogle_flap = 65533 -}; - -/* These hold paramaters for the kinds of side effects that are possible - * in the supported pattern languages. These include things like the - * numeric bounds of {} operators and the index of paren registers for - * subexpression measurement or backreferencing. - */ -struct re_se_params -{ - enum re_side_effects se; - int op1; - int op2; -}; - -typedef unsigned reg_syntax_t; - -struct re_pattern_buffer -{ - struct rx rx; - reg_syntax_t syntax; /* See below for syntax bit definitions. */ - - unsigned int no_sub:1; /* If set, don't return register offsets. */ - unsigned int not_bol:1; /* If set, the anchors ('^' and '$') don't */ - unsigned int not_eol:1; /* match at the ends of the string. */ - unsigned int newline_anchor:1;/* If true, an anchor at a newline matches.*/ - unsigned int least_subs:1; /* If set, and returning registers, return - * as few values as possible. Only - * backreferenced groups and group 0 (the whole - * match) will be returned. - */ - - /* If true, this says that the matcher should keep registers on its - * backtracking stack. For many patterns, we can easily determine that - * this isn't necessary. - */ - unsigned int match_regs_on_stack:1; - unsigned int search_regs_on_stack:1; - - /* is_anchored and begbuf_only are filled in by rx_compile. */ - unsigned int is_anchored:1; /* Anchorded by ^? */ - unsigned int begbuf_only:1; /* Anchored to char position 0? */ - - - /* If REGS_UNALLOCATED, allocate space in the `regs' structure - * for `max (RE_NREGS, re_nsub + 1)' groups. - * If REGS_REALLOCATE, reallocate space if necessary. - * If REGS_FIXED, use what's there. - */ -#define REGS_UNALLOCATED 0 -#define REGS_REALLOCATE 1 -#define REGS_FIXED 2 - unsigned int regs_allocated:2; - - - /* Either a translate table to apply to all characters before - * comparing them, or zero for no translation. The translation - * is applied to a pattern when it is compiled and to a string - * when it is matched. - */ - unsigned char * translate; - - /* If this is a valid pointer, it tells rx not to store the extents of - * certain subexpressions (those corresponding to non-zero entries). - * Passing 0x1 is the same as passing an array of all ones. Passing 0x0 - * is the same as passing an array of all zeros. - * The array should contain as many entries as their are subexps in the - * regexp. - * - * For POSIX compatability, when using regcomp and regexec this field - * is zeroed and ignored. - */ - char * syntax_parens; - - /* Number of subexpressions found by the compiler. */ - size_t re_nsub; - - void * buffer; /* Malloced memory for the nfa. */ - unsigned long allocated; /* Size of that memory. */ - - /* Pointer to a fastmap, if any, otherwise zero. re_search uses - * the fastmap, if there is one, to skip over impossible - * starting points for matches. */ - char *fastmap; - - unsigned int fastmap_accurate:1; /* These three are internal. */ - unsigned int can_match_empty:1; - struct rx_nfa_state * start; /* The nfa starting state. */ - - /* This is the list of iterator bounds for {lo,hi} constructs. - * The memory pointed to is part of the rx->buffer. - */ - struct re_se_params *se_params; - - /* This is a bitset representation of the fastmap. - * This is a true fastmap that already takes the translate - * table into account. - */ - rx_Bitset fastset; -}; - -/* Type for byte offsets within the string. POSIX mandates this. */ -typedef int regoff_t; - -/* This is the structure we store register match data in. See - regex.texinfo for a full description of what registers match. */ -struct re_registers -{ - unsigned num_regs; - regoff_t *start; - regoff_t *end; -}; - -typedef struct re_pattern_buffer regex_t; - -/* POSIX specification for registers. Aside from the different names than - `re_registers', POSIX uses an array of structures, instead of a - structure of arrays. */ -typedef struct -{ - regoff_t rm_so; /* Byte offset from string's start to substring's start. */ - regoff_t rm_eo; /* Byte offset from string's start to substring's end. */ -} regmatch_t; - - -/* The following bits are used to determine the regexp syntax we - recognize. The set/not-set meanings are chosen so that Emacs syntax - remains the value 0. The bits are given in alphabetical order, and - the definitions shifted by one from the previous bit; thus, when we - add or remove a bit, only one other definition need change. */ - -/* If this bit is not set, then \ inside a bracket expression is literal. - If set, then such a \ quotes the following character. */ -#define RE_BACKSLASH_ESCAPE_IN_LISTS (1) - -/* If this bit is not set, then + and ? are operators, and \+ and \? are - literals. - If set, then \+ and \? are operators and + and ? are literals. */ -#define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1) - -/* If this bit is set, then character classes are supported. They are: - [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:], - [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:]. - If not set, then character classes are not supported. */ -#define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1) - -/* If this bit is set, then ^ and $ are always anchors (outside bracket - expressions, of course). - If this bit is not set, then it depends: - ^ is an anchor if it is at the beginning of a regular - expression or after an open-group or an alternation operator; - $ is an anchor if it is at the end of a regular expression, or - before a close-group or an alternation operator. - - This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because - POSIX draft 11.2 says that * etc. in leading positions is undefined. - We already implemented a previous draft which made those constructs - invalid, though, so we haven't changed the code back. */ -#define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1) - -/* If this bit is set, then special characters are always special - regardless of where they are in the pattern. - If this bit is not set, then special characters are special only in - some contexts; otherwise they are ordinary. Specifically, - * + ? and intervals are only special when not after the beginning, - open-group, or alternation operator. */ -#define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1) - -/* If this bit is set, then *, +, ?, and { cannot be first in an re or - immediately after an alternation or begin-group operator. */ -#define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1) - -/* If this bit is set, then . matches newline. - If not set, then it doesn't. */ -#define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1) - -/* If this bit is set, then . doesn't match NUL. - If not set, then it does. */ -#define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1) - -/* If this bit is set, nonmatching lists [^...] do not match newline. - If not set, they do. */ -#define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1) - -/* If this bit is set, either \{...\} or {...} defines an - interval, depending on RE_NO_BK_BRACES. - If not set, \{, \}, {, and } are literals. */ -#define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1) - -/* If this bit is set, +, ? and | aren't recognized as operators. - If not set, they are. */ -#define RE_LIMITED_OPS (RE_INTERVALS << 1) - -/* If this bit is set, newline is an alternation operator. - If not set, newline is literal. */ -#define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1) - -/* If this bit is set, then `{...}' defines an interval, and \{ and \} - are literals. - If not set, then `\{...\}' defines an interval. */ -#define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1) - -/* If this bit is set, (...) defines a group, and \( and \) are literals. - If not set, \(...\) defines a group, and ( and ) are literals. */ -#define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1) - -/* If this bit is set, then \<digit> matches <digit>. - If not set, then \<digit> is a back-reference. */ -#define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1) - -/* If this bit is set, then | is an alternation operator, and \| is literal. - If not set, then \| is an alternation operator, and | is literal. */ -#define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1) - -/* If this bit is set, then an ending range point collating higher - than the starting range point, as in [z-a], is invalid. - If not set, then when ending range point collates higher than the - starting range point, the range is ignored. */ -#define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1) - -/* If this bit is set, then an unmatched ) is ordinary. - If not set, then an unmatched ) is invalid. */ -#define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1) - -/* This global variable defines the particular regexp syntax to use (for - some interfaces). When a regexp is compiled, the syntax used is - stored in the pattern buffer, so changing this does not affect - already-compiled regexps. */ -extern reg_syntax_t re_syntax_options; - -/* Define combinations of the above bits for the standard possibilities. - (The [[[ comments delimit what gets put into the Texinfo file, so - don't delete them!) */ -/* [[[begin syntaxes]]] */ -#define RE_SYNTAX_EMACS 0 - -#define RE_SYNTAX_AWK \ - (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \ - | RE_NO_BK_PARENS | RE_NO_BK_REFS \ - | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \ - | RE_UNMATCHED_RIGHT_PAREN_ORD) - -#define RE_SYNTAX_POSIX_AWK \ - (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS) - -#define RE_SYNTAX_GREP \ - (RE_BK_PLUS_QM | RE_CHAR_CLASSES \ - | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \ - | RE_NEWLINE_ALT) - -#define RE_SYNTAX_EGREP \ - (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \ - | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \ - | RE_NEWLINE_ALT | RE_NO_BK_PARENS \ - | RE_NO_BK_VBAR) - -#define RE_SYNTAX_POSIX_EGREP \ - (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) - -#define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC - -/* Syntax bits common to both basic and extended POSIX regex syntax. */ -#define _RE_SYNTAX_POSIX_COMMON \ - (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \ - | RE_INTERVALS | RE_NO_EMPTY_RANGES) - -#define RE_SYNTAX_POSIX_BASIC \ - (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM) - -/* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes - RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this - isn't minimal, since other operators, such as \`, aren't disabled. */ -#define RE_SYNTAX_POSIX_MINIMAL_BASIC \ - (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS) - -#define RE_SYNTAX_POSIX_EXTENDED \ - (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ - | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \ - | RE_NO_BK_PARENS | RE_NO_BK_VBAR \ - | RE_UNMATCHED_RIGHT_PAREN_ORD) - -/* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS - replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */ -#define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \ - (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ - | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \ - | RE_NO_BK_PARENS | RE_NO_BK_REFS \ - | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD) -/* [[[end syntaxes]]] */ - -/* Maximum number of duplicates an interval can allow. Some systems - (erroneously) define this in other header files, but we want our - value, so remove any previous define. */ -#ifdef RE_DUP_MAX -#undef RE_DUP_MAX -#endif -#define RE_DUP_MAX ((1 << 15) - 1) - - - -/* POSIX `cflags' bits (i.e., information for `regcomp'). */ - -/* If this bit is set, then use extended regular expression syntax. - If not set, then use basic regular expression syntax. */ -#define REG_EXTENDED 1 - -/* If this bit is set, then ignore case when matching. - If not set, then case is significant. */ -#define REG_ICASE (REG_EXTENDED << 1) - -/* If this bit is set, then anchors do not match at newline - characters in the string. - If not set, then anchors do match at newlines. */ -#define REG_NEWLINE (REG_ICASE << 1) - -/* If this bit is set, then report only success or fail in regexec. - If not set, then returns differ between not matching and errors. */ -#define REG_NOSUB (REG_NEWLINE << 1) - - -/* POSIX `eflags' bits (i.e., information for regexec). */ - -/* If this bit is set, then the beginning-of-line operator doesn't match - the beginning of the string (presumably because it's not the - beginning of a line). - If not set, then the beginning-of-line operator does match the - beginning of the string. */ -#define REG_NOTBOL 1 - -/* Like REG_NOTBOL, except for the end-of-line. */ -#define REG_NOTEOL (1 << 1) - -/* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer, - * `re_match_2' returns information about at least this many registers - * the first time a `regs' structure is passed. - * - * Also, this is the greatest number of backreferenced subexpressions - * allowed in a pattern being matched without caller-supplied registers. - */ -#ifndef RE_NREGS -#define RE_NREGS 30 -#endif - -extern int rx_cache_bound; -extern const char *rx_version_string; - - - -#ifdef RX_WANT_RX_DEFS - -/* This is decls to the interesting subsystems and lower layers - * of rx. Everything which doesn't have a public counterpart in - * regex.c is declared here. - */ - - -#ifdef __STDC__ -typedef void (*rx_hash_freefn) (struct rx_hash_item * it); -#else /* ndef __STDC__ */ -typedef void (*rx_hash_freefn) (); -#endif /* ndef __STDC__ */ - - - - -#ifdef __STDC__ -RX_DECL int rx_bitset_is_equal (int size, rx_Bitset a, rx_Bitset b); -RX_DECL int rx_bitset_is_subset (int size, rx_Bitset a, rx_Bitset b); -RX_DECL int rx_bitset_empty (int size, rx_Bitset set); -RX_DECL void rx_bitset_null (int size, rx_Bitset b); -RX_DECL void rx_bitset_universe (int size, rx_Bitset b); -RX_DECL void rx_bitset_complement (int size, rx_Bitset b); -RX_DECL void rx_bitset_assign (int size, rx_Bitset a, rx_Bitset b); -RX_DECL void rx_bitset_union (int size, rx_Bitset a, rx_Bitset b); -RX_DECL void rx_bitset_intersection (int size, - rx_Bitset a, rx_Bitset b); -RX_DECL void rx_bitset_difference (int size, rx_Bitset a, rx_Bitset b); -RX_DECL void rx_bitset_revdifference (int size, - rx_Bitset a, rx_Bitset b); -RX_DECL void rx_bitset_xor (int size, rx_Bitset a, rx_Bitset b); -RX_DECL unsigned long rx_bitset_hash (int size, rx_Bitset b); -RX_DECL struct rx_hash_item * rx_hash_find (struct rx_hash * table, - unsigned long hash, - void * value, - struct rx_hash_rules * rules); -RX_DECL struct rx_hash_item * rx_hash_store (struct rx_hash * table, - unsigned long hash, - void * value, - struct rx_hash_rules * rules); -RX_DECL void rx_hash_free (struct rx_hash_item * it, struct rx_hash_rules * rules); -RX_DECL void rx_free_hash_table (struct rx_hash * tab, rx_hash_freefn freefn, - struct rx_hash_rules * rules); -RX_DECL rx_Bitset rx_cset (struct rx *rx); -RX_DECL rx_Bitset rx_copy_cset (struct rx *rx, rx_Bitset a); -RX_DECL void rx_free_cset (struct rx * rx, rx_Bitset c); -RX_DECL struct rexp_node * rexp_node (struct rx *rx, - enum rexp_node_type type); -RX_DECL struct rexp_node * rx_mk_r_cset (struct rx * rx, - rx_Bitset b); -RX_DECL struct rexp_node * rx_mk_r_concat (struct rx * rx, - struct rexp_node * a, - struct rexp_node * b); -RX_DECL struct rexp_node * rx_mk_r_alternate (struct rx * rx, - struct rexp_node * a, - struct rexp_node * b); -RX_DECL struct rexp_node * rx_mk_r_opt (struct rx * rx, - struct rexp_node * a); -RX_DECL struct rexp_node * rx_mk_r_star (struct rx * rx, - struct rexp_node * a); -RX_DECL struct rexp_node * rx_mk_r_2phase_star (struct rx * rx, - struct rexp_node * a, - struct rexp_node * b); -RX_DECL struct rexp_node * rx_mk_r_side_effect (struct rx * rx, - rx_side_effect a); -RX_DECL struct rexp_node * rx_mk_r_data (struct rx * rx, - void * a); -RX_DECL void rx_free_rexp (struct rx * rx, struct rexp_node * node); -RX_DECL struct rexp_node * rx_copy_rexp (struct rx *rx, - struct rexp_node *node); -RX_DECL struct rx_nfa_state * rx_nfa_state (struct rx *rx); -RX_DECL void rx_free_nfa_state (struct rx_nfa_state * n); -RX_DECL struct rx_nfa_state * rx_id_to_nfa_state (struct rx * rx, - int id); -RX_DECL struct rx_nfa_edge * rx_nfa_edge (struct rx *rx, - enum rx_nfa_etype type, - struct rx_nfa_state *start, - struct rx_nfa_state *dest); -RX_DECL void rx_free_nfa_edge (struct rx_nfa_edge * e); -RX_DECL void rx_free_nfa (struct rx *rx); -RX_DECL int rx_build_nfa (struct rx *rx, - struct rexp_node *rexp, - struct rx_nfa_state **start, - struct rx_nfa_state **end); -RX_DECL void rx_name_nfa_states (struct rx *rx); -RX_DECL int rx_eclose_nfa (struct rx *rx); -RX_DECL void rx_delete_epsilon_transitions (struct rx *rx); -RX_DECL int rx_compactify_nfa (struct rx *rx, - void **mem, unsigned long *size); -RX_DECL void rx_release_superset (struct rx *rx, - struct rx_superset *set); -RX_DECL struct rx_superset * rx_superset_cons (struct rx * rx, - struct rx_nfa_state *car, struct rx_superset *cdr); -RX_DECL struct rx_superset * rx_superstate_eclosure_union - (struct rx * rx, struct rx_superset *set, struct rx_nfa_state_set *ecl); -RX_DECL struct rx_superstate * rx_superstate (struct rx *rx, - struct rx_superset *set); -RX_DECL struct rx_inx * rx_handle_cache_miss - (struct rx *rx, struct rx_superstate *super, unsigned char chr, void *data); -RX_DECL reg_errcode_t rx_compile (__const__ char *pattern, int size, - reg_syntax_t syntax, - struct re_pattern_buffer * rxb); -RX_DECL void rx_blow_up_fastmap (struct re_pattern_buffer * rxb); -#else /* STDC */ -RX_DECL int rx_bitset_is_equal (); -RX_DECL int rx_bitset_is_subset (); -RX_DECL int rx_bitset_empty (); -RX_DECL void rx_bitset_null (); -RX_DECL void rx_bitset_universe (); -RX_DECL void rx_bitset_complement (); -RX_DECL void rx_bitset_assign (); -RX_DECL void rx_bitset_union (); -RX_DECL void rx_bitset_intersection (); -RX_DECL void rx_bitset_difference (); -RX_DECL void rx_bitset_revdifference (); -RX_DECL void rx_bitset_xor (); -RX_DECL unsigned long rx_bitset_hash (); -RX_DECL struct rx_hash_item * rx_hash_find (); -RX_DECL struct rx_hash_item * rx_hash_store (); -RX_DECL void rx_hash_free (); -RX_DECL void rx_free_hash_table (); -RX_DECL rx_Bitset rx_cset (); -RX_DECL rx_Bitset rx_copy_cset (); -RX_DECL void rx_free_cset (); -RX_DECL struct rexp_node * rexp_node (); -RX_DECL struct rexp_node * rx_mk_r_cset (); -RX_DECL struct rexp_node * rx_mk_r_concat (); -RX_DECL struct rexp_node * rx_mk_r_alternate (); -RX_DECL struct rexp_node * rx_mk_r_opt (); -RX_DECL struct rexp_node * rx_mk_r_star (); -RX_DECL struct rexp_node * rx_mk_r_2phase_star (); -RX_DECL struct rexp_node * rx_mk_r_side_effect (); -RX_DECL struct rexp_node * rx_mk_r_data (); -RX_DECL void rx_free_rexp (); -RX_DECL struct rexp_node * rx_copy_rexp (); -RX_DECL struct rx_nfa_state * rx_nfa_state (); -RX_DECL void rx_free_nfa_state (); -RX_DECL struct rx_nfa_state * rx_id_to_nfa_state (); -RX_DECL struct rx_nfa_edge * rx_nfa_edge (); -RX_DECL void rx_free_nfa_edge (); -RX_DECL void rx_free_nfa (); -RX_DECL int rx_build_nfa (); -RX_DECL void rx_name_nfa_states (); -RX_DECL int rx_eclose_nfa (); -RX_DECL void rx_delete_epsilon_transitions (); -RX_DECL int rx_compactify_nfa (); -RX_DECL void rx_release_superset (); -RX_DECL struct rx_superset * rx_superset_cons (); -RX_DECL struct rx_superset * rx_superstate_eclosure_union (); -RX_DECL struct rx_superstate * rx_superstate (); -RX_DECL struct rx_inx * rx_handle_cache_miss (); -RX_DECL reg_errcode_t rx_compile (); -RX_DECL void rx_blow_up_fastmap (); -#endif /* STDC */ - - -#endif /* RX_WANT_RX_DEFS */ - - - -#ifdef __STDC__ -extern int re_search_2 (struct re_pattern_buffer *rxb, - __const__ char * string1, int size1, - __const__ char * string2, int size2, - int startpos, int range, - struct re_registers *regs, - int stop); -extern int re_search (struct re_pattern_buffer * rxb, __const__ char *string, - int size, int startpos, int range, - struct re_registers *regs); -extern int re_match_2 (struct re_pattern_buffer * rxb, - __const__ char * string1, int size1, - __const__ char * string2, int size2, - int pos, struct re_registers *regs, int stop); -extern int re_match (struct re_pattern_buffer * rxb, - __const__ char * string, - int size, int pos, - struct re_registers *regs); -extern reg_syntax_t re_set_syntax (reg_syntax_t syntax); -extern void re_set_registers (struct re_pattern_buffer *bufp, - struct re_registers *regs, - unsigned num_regs, - regoff_t * starts, regoff_t * ends); -extern __const__ char * re_compile_pattern (__const__ char *pattern, - int length, - struct re_pattern_buffer * rxb); -extern int re_compile_fastmap (struct re_pattern_buffer * rxb); -extern char * re_comp (__const__ char *s); -extern int re_exec (__const__ char *s); -extern int regcomp (regex_t * preg, __const__ char * pattern, int cflags); -extern int regexec (__const__ regex_t *preg, __const__ char *string, - size_t nmatch, regmatch_t pmatch[], - int eflags); -extern size_t regerror (int errcode, __const__ regex_t *preg, - char *errbuf, size_t errbuf_size); -extern void regfree (regex_t *preg); - -#else /* STDC */ -extern int re_search_2 (); -extern int re_search (); -extern int re_match_2 (); -extern int re_match (); -extern reg_syntax_t re_set_syntax (); -extern void re_set_registers (); -extern __const__ char * re_compile_pattern (); -extern int re_compile_fastmap (); -extern char * re_comp (); -extern int re_exec (); -extern int regcomp (); -extern int regexec (); -extern size_t regerror (); -extern void regfree (); - -#endif /* STDC */ - - - -#ifdef RX_WANT_RX_DEFS - -struct rx_counter_frame -{ - int tag; - int val; - struct rx_counter_frame * inherited_from; /* If this is a copy. */ - struct rx_counter_frame * cdr; -}; - -struct rx_backtrack_frame -{ - char * counter_stack_sp; - - /* A frame is used to save the matchers state when it crosses a - * backtracking point. The `stk_' fields correspond to variables - * in re_search_2 (just strip off thes `stk_'). They are documented - * tere. - */ - struct rx_superstate * stk_super; - unsigned int stk_c; - struct rx_string_position stk_test_pos; - int stk_last_l; - int stk_last_r; - int stk_test_ret; - - /* This is the list of options left to explore at the backtrack - * point for which this frame was created. - */ - struct rx_distinct_future * df; - struct rx_distinct_future * first_df; - -#ifdef RX_DEBUG - int stk_line_no; -#endif -}; - -struct rx_stack_chunk -{ - struct rx_stack_chunk * next_chunk; - int bytes_left; - char * sp; -}; - -enum rx_outer_entry -{ - rx_outer_start, - rx_outer_fastmap, - rx_outer_test, - rx_outer_restore_pos -}; - -enum rx_fastmap_return -{ - rx_fastmap_continuation, - rx_fastmap_error, - rx_fastmap_ok, - rx_fastmap_fail -}; - -enum rx_fastmap_entry -{ - rx_fastmap_start, - rx_fastmap_string_break -}; - -enum rx_test_return -{ - rx_test_continuation, - rx_test_error, - rx_test_fail, - rx_test_ok -}; - -enum rx_test_internal_return -{ - rx_test_internal_error, - rx_test_found_first, - rx_test_line_finished -}; - -enum rx_test_match_entry -{ - rx_test_start, - rx_test_cache_hit_loop, - rx_test_backreference_check, - rx_test_backtrack_return -}; - -struct rx_search_state -{ - /* Two groups of registers are kept. The group with the register state - * of the current test match, and the group that holds the state at the end - * of the best known match, if any. - * - * For some patterns, there may also be registers saved on the stack. - */ - unsigned num_regs; /* Includes an element for register zero. */ - regoff_t * lparen; /* scratch space for register returns */ - regoff_t * rparen; - regoff_t * best_lpspace; /* in case the user doesn't want these */ - regoff_t * best_rpspace; /* values, we still need space to store - * them. Normally, this memoryis unused - * and the space pointed to by REGS is - * used instead. - */ - - int last_l; /* Highest index of a valid lparen. */ - int last_r; /* It's dual. */ - - int * best_lparen; /* This contains the best known register */ - int * best_rparen; /* assignments. - * This may point to the same mem as - * best_lpspace, or it might point to memory - * passed by the caller. - */ - int best_last_l; /* best_last_l:best_lparen::last_l:lparen */ - int best_last_r; - - - unsigned char * translate; - - struct rx_string_position outer_pos; - - struct rx_superstate * start_super; - int nfa_choice; - int first_found; /* If true, return after finding any match. */ - int ret_val; - - /* For continuations... */ - enum rx_outer_entry outer_search_resume_pt; - struct re_pattern_buffer * saved_rxb; - int saved_startpos; - int saved_range; - int saved_stop; - int saved_total_size; - rx_get_burst_fn saved_get_burst; - rx_back_check_fn saved_back_check; - struct re_registers * saved_regs; - - /** - ** state for fastmap - **/ - char * fastmap; - int fastmap_chr; - int fastmap_val; - - /* for continuations in the fastmap procedure: */ - enum rx_fastmap_entry fastmap_resume_pt; - - /** - ** state for test_match - **/ - - /* The current superNFA position of the matcher. */ - struct rx_superstate * super; - - /* The matcher interprets a series of instruction frames. - * This is the `instruction counter' for the interpretation. - */ - struct rx_inx * ifr; - - /* We insert a ghost character in the string to prime - * the nfa. test_pos.pos, test_pos.str_half, and test_pos.end_half - * keep track of the test-match position and string-half. - */ - unsigned char c; - - /* Position within the string. */ - struct rx_string_position test_pos; - - struct rx_stack_chunk * counter_stack; - struct rx_stack_chunk * backtrack_stack; - int backtrack_frame_bytes; - int chunk_bytes; - struct rx_stack_chunk * free_chunks; - - /* To return from this function, set test_ret and - * `goto test_do_return'. - * - * Possible return values are: - * 1 --- end of string while the superNFA is still going - * 0 --- internal error (out of memory) - * -1 --- search completed by reaching the superNFA fail state - * -2 --- a match was found, maybe not the longest. - * - * When the search is complete (-1), best_last_r indicates whether - * a match was found. - * - * -2 is return only if search_state.first_found is non-zero. - * - * if search_state.first_found is non-zero, a return of -1 indicates no match, - * otherwise, best_last_r has to be checked. - */ - int test_ret; - - int could_have_continued; - -#ifdef RX_DEBUG - int backtrack_depth; - /* There is a search tree with every node as set of deterministic - * transitions in the super nfa. For every branch of a - * backtrack point is an edge in the tree. - * This counts up a pre-order of nodes in that tree. - * It's saved on the search stack and printed when debugging. - */ - int line_no; - int lines_found; -#endif - - - /* For continuations within the match tester */ - enum rx_test_match_entry test_match_resume_pt; - struct rx_inx * saved_next_tr_table; - struct rx_inx * saved_this_tr_table; - int saved_reg; - struct rx_backtrack_frame * saved_bf; - -}; - - -extern char rx_slowmap[]; -extern unsigned char rx_id_translation[]; - -static __inline__ void -init_fastmap (rxb, search_state) - struct re_pattern_buffer * rxb; - struct rx_search_state * search_state; -{ - search_state->fastmap = (rxb->fastmap - ? (char *)rxb->fastmap - : (char *)rx_slowmap); - /* Update the fastmap now if not correct already. - * When the regexp was compiled, the fastmap was computed - * and stored in a bitset. This expands the bitset into a - * character array containing 1s and 0s. - */ - if ((search_state->fastmap == rxb->fastmap) && !rxb->fastmap_accurate) - rx_blow_up_fastmap (rxb); - search_state->fastmap_chr = -1; - search_state->fastmap_val = 0; - search_state->fastmap_resume_pt = rx_fastmap_start; -} - -static __inline__ void -uninit_fastmap (rxb, search_state) - struct re_pattern_buffer * rxb; - struct rx_search_state * search_state; -{ - /* Unset the fastmap sentinel */ - if (search_state->fastmap_chr >= 0) - search_state->fastmap[search_state->fastmap_chr] - = search_state->fastmap_val; -} - -static __inline__ int -fastmap_search (rxb, stop, get_burst, app_closure, search_state) - struct re_pattern_buffer * rxb; - int stop; - rx_get_burst_fn get_burst; - void * app_closure; - struct rx_search_state * search_state; -{ - enum rx_fastmap_entry pc; - - if (0) - { - return_continuation: - search_state->fastmap_resume_pt = pc; - return rx_fastmap_continuation; - } - - pc = search_state->fastmap_resume_pt; - - switch (pc) - { - default: - return rx_fastmap_error; - case rx_fastmap_start: - init_fastmap_sentinal: - /* For the sake of fast fastmapping, set a sentinal in the fastmap. - * This sentinal will trap the fastmap loop when it reaches the last - * valid character in a string half. - * - * This must be reset when the fastmap/search loop crosses a string - * boundry, and before returning to the caller. So sometimes, - * the fastmap loop is restarted with `continue', othertimes by - * `goto init_fastmap_sentinal'. - */ - if (search_state->outer_pos.size) - { - search_state->fastmap_chr = ((search_state->outer_pos.search_direction == 1) - ? *(search_state->outer_pos.end - 1) - : *search_state->outer_pos.string); - search_state->fastmap_val - = search_state->fastmap[search_state->fastmap_chr]; - search_state->fastmap[search_state->fastmap_chr] = 1; - } - else - { - search_state->fastmap_chr = -1; - search_state->fastmap_val = 0; - } - - if (search_state->outer_pos.pos >= search_state->outer_pos.end) - goto fastmap_hit_bound; - else - { - if (search_state->outer_pos.search_direction == 1) - { - if (search_state->fastmap_val) - { - for (;;) - { - while (!search_state->fastmap[*search_state->outer_pos.pos]) - ++search_state->outer_pos.pos; - return rx_fastmap_ok; - } - } - else - { - for (;;) - { - while (!search_state->fastmap[*search_state->outer_pos.pos]) - ++search_state->outer_pos.pos; - if (*search_state->outer_pos.pos != search_state->fastmap_chr) - return rx_fastmap_ok; - else - { - ++search_state->outer_pos.pos; - if (search_state->outer_pos.pos == search_state->outer_pos.end) - goto fastmap_hit_bound; - } - } - } - } - else - { - __const__ unsigned char * bound; - bound = search_state->outer_pos.string - 1; - if (search_state->fastmap_val) - { - for (;;) - { - while (!search_state->fastmap[*search_state->outer_pos.pos]) - --search_state->outer_pos.pos; - return rx_fastmap_ok; - } - } - else - { - for (;;) - { - while (!search_state->fastmap[*search_state->outer_pos.pos]) - --search_state->outer_pos.pos; - if ((*search_state->outer_pos.pos != search_state->fastmap_chr) || search_state->fastmap_val) - return rx_fastmap_ok; - else - { - --search_state->outer_pos.pos; - if (search_state->outer_pos.pos == bound) - goto fastmap_hit_bound; - } - } - } - } - } - - case rx_fastmap_string_break: - fastmap_hit_bound: - { - /* If we hit a bound, it may be time to fetch another burst - * of string, or it may be time to return a continuation to - * the caller, or it might be time to fail. - */ - - int burst_state; - burst_state = get_burst (&search_state->outer_pos, app_closure, stop); - switch (burst_state) - { - default: - case rx_get_burst_error: - return rx_fastmap_error; - case rx_get_burst_continuation: - { - pc = rx_fastmap_string_break; - goto return_continuation; - } - case rx_get_burst_ok: - goto init_fastmap_sentinal; - case rx_get_burst_no_more: - /* ...not a string split, simply no more string. - * - * When searching backward, running out of string - * is reason to quit. - * - * When searching forward, we allow the possibility - * of an (empty) match after the last character in the - * virtual string. So, fall through to the matcher - */ - return ( (search_state->outer_pos.search_direction == 1) - ? rx_fastmap_ok - : rx_fastmap_fail); - } - } - } - -} - - - -#ifdef emacs -/* The `emacs' switch turns on certain matching commands - * that make sense only in Emacs. - */ -#include "config.h" -#include "lisp.h" -#include "buffer.h" -#include "syntax.h" -#endif /* emacs */ - -/* Setting RX_MEMDBUG is useful if you have dbmalloc. Maybe with similar - * packages too. - */ -#ifdef RX_MEMDBUG -#include <malloc.h> -#endif /* RX_RX_MEMDBUG */ - -/* We used to test for `BSTRING' here, but only GCC and Emacs define - * `BSTRING', as far as I know, and neither of them use this code. - */ -#if HAVE_STRING_H || STDC_HEADERS -#include <string.h> - -#ifndef bcmp -#define bcmp(s1, s2, n) memcmp ((s1), (s2), (n)) -#endif - -#ifndef bcopy -#define bcopy(s, d, n) memcpy ((d), (s), (n)) -#endif - -#ifndef bzero -#define bzero(s, n) memset ((s), 0, (n)) -#endif - -#else /* HAVE_STRING_H || STDC_HEADERS */ -#include <strings.h> -#endif /* not (HAVE_STRING_H || STDC_HEADERS) */ - -#ifdef STDC_HEADERS -#include <stdlib.h> -#else /* not STDC_HEADERS */ -char *malloc (); -char *realloc (); -#endif /* not STDC_HEADERS */ - - - - -/* How many characters in the character set. */ -#define CHAR_SET_SIZE (1 << CHARBITS) - -#ifndef emacs -/* Define the syntax basics for \<, \>, etc. - * This must be nonzero for the wordchar and notwordchar pattern - * commands in re_match_2. - */ -#ifndef Sword -#define Sword 1 -#endif -#define SYNTAX(c) re_syntax_table[c] -RX_DECL char re_syntax_table[CHAR_SET_SIZE]; -#endif /* not emacs */ - - -/* Test if at very beginning or at very end of the virtual concatenation - * of `string1' and `string2'. If only one string, it's `string2'. - */ - -#define AT_STRINGS_BEG() \ - ( -1 \ - == ((search_state.test_pos.pos - search_state.test_pos.string) \ - + search_state.test_pos.offset)) - -#define AT_STRINGS_END() \ - ( (total_size - 1) \ - == ((search_state.test_pos.pos - search_state.test_pos.string) \ - + search_state.test_pos.offset)) - - -/* Test if POS + 1 points to a character which is word-constituent. We have - * two special cases to check for: if past the end of string1, look at - * the first character in string2; and if before the beginning of - * string2, look at the last character in string1. - * - * Assumes `string1' exists, so use in conjunction with AT_STRINGS_BEG (). - */ -#define LETTER_P(POS,OFF) \ - ( SYNTAX (fetch_char(POS, OFF, app_closure, stop)) \ - == Sword) - -/* Test if the character at D and the one after D differ with respect - * to being word-constituent. - */ -#define AT_WORD_BOUNDARY(d) \ - (AT_STRINGS_BEG () || AT_STRINGS_END () || LETTER_P (d,0) != LETTER_P (d, 1)) - - -#ifdef RX_SUPPORT_CONTINUATIONS -#define RX_STACK_ALLOC(BYTES) malloc(BYTES) -#define RX_STACK_FREE(MEM) free(MEM) -#else -#define RX_STACK_ALLOC(BYTES) alloca(BYTES) -#define RX_STACK_FREE(MEM) \ - ((struct rx_stack_chunk *)MEM)->next_chunk = search_state.free_chunks; \ - search_state.free_chunks = ((struct rx_stack_chunk *)MEM); - -#endif - -#define PUSH(CHUNK_VAR,BYTES) \ - if (!CHUNK_VAR || (CHUNK_VAR->bytes_left < (BYTES))) \ - { \ - struct rx_stack_chunk * new_chunk; \ - if (search_state.free_chunks) \ - { \ - new_chunk = search_state.free_chunks; \ - search_state.free_chunks = search_state.free_chunks->next_chunk; \ - } \ - else \ - { \ - new_chunk = (struct rx_stack_chunk *)RX_STACK_ALLOC(search_state.chunk_bytes); \ - if (!new_chunk) \ - { \ - search_state.ret_val = 0; \ - goto test_do_return; \ - } \ - } \ - new_chunk->sp = (char *)new_chunk + sizeof (struct rx_stack_chunk); \ - new_chunk->bytes_left = (search_state.chunk_bytes \ - - (BYTES) \ - - sizeof (struct rx_stack_chunk)); \ - new_chunk->next_chunk = CHUNK_VAR; \ - CHUNK_VAR = new_chunk; \ - } \ - else \ - (CHUNK_VAR->sp += (BYTES)), (CHUNK_VAR->bytes_left -= (BYTES)) - -#define POP(CHUNK_VAR,BYTES) \ - if (CHUNK_VAR->sp == ((char *)CHUNK_VAR + sizeof(*CHUNK_VAR))) \ - { \ - struct rx_stack_chunk * new_chunk = CHUNK_VAR->next_chunk; \ - RX_STACK_FREE(CHUNK_VAR); \ - CHUNK_VAR = new_chunk; \ - } \ - else \ - (CHUNK_VAR->sp -= BYTES), (CHUNK_VAR->bytes_left += BYTES) - - - -#define SRCH_TRANSLATE(C) search_state.translate[(unsigned char) (C)] - - - - -#ifdef __STDC__ -RX_DECL __inline__ int -rx_search (struct re_pattern_buffer * rxb, - int startpos, - int range, - int stop, - int total_size, - rx_get_burst_fn get_burst, - rx_back_check_fn back_check, - rx_fetch_char_fn fetch_char, - void * app_closure, - struct re_registers * regs, - struct rx_search_state * resume_state, - struct rx_search_state * save_state) -#else -RX_DECL __inline__ int -rx_search (rxb, startpos, range, stop, total_size, - get_burst, back_check, fetch_char, - app_closure, regs, resume_state, save_state) - struct re_pattern_buffer * rxb; - int startpos; - int range; - int stop; - int total_size; - rx_get_burst_fn get_burst; - rx_back_check_fn back_check; - rx_fetch_char_fn fetch_char; - void * app_closure; - struct re_registers * regs; - struct rx_search_state * resume_state; - struct rx_search_state * save_state; -#endif -{ - int pc; - int test_state; - struct rx_search_state search_state; - - search_state.free_chunks = 0; - if (!resume_state) - pc = rx_outer_start; - else - { - search_state = *resume_state; - regs = search_state.saved_regs; - rxb = search_state.saved_rxb; - startpos = search_state.saved_startpos; - range = search_state.saved_range; - stop = search_state.saved_stop; - total_size = search_state.saved_total_size; - get_burst = search_state.saved_get_burst; - back_check = search_state.saved_back_check; - pc = search_state.outer_search_resume_pt; - if (0) - { - return_continuation: - if (save_state) - { - *save_state = search_state; - save_state->saved_regs = regs; - save_state->saved_rxb = rxb; - save_state->saved_startpos = startpos; - save_state->saved_range = range; - save_state->saved_stop = stop; - save_state->saved_total_size = total_size; - save_state->saved_get_burst = get_burst; - save_state->saved_back_check = back_check; - save_state->outer_search_resume_pt = pc; - } - return rx_search_continuation; - } - } - - switch (pc) - { - case rx_outer_start: - search_state.ret_val = rx_search_fail; - ( search_state.lparen - = search_state.rparen - = search_state.best_lpspace - = search_state.best_rpspace - = 0); - - /* figure the number of registers we may need for use in backreferences. - * the number here includes an element for register zero. - */ - search_state.num_regs = rxb->re_nsub + 1; - - - /* check for out-of-range startpos. */ - if ((startpos < 0) || (startpos > total_size)) - return rx_search_fail; - - /* fix up range if it might eventually take us outside the string. */ - { - int endpos; - endpos = startpos + range; - if (endpos < -1) - range = (-1 - startpos); - else if (endpos > (total_size + 1)) - range = total_size - startpos; - } - - /* if the search isn't to be a backwards one, don't waste time in a - * long search for a pattern that says it is anchored. - */ - if (rxb->begbuf_only && (range > 0)) - { - if (startpos > 0) - return rx_search_fail; - else - range = 1; - } - - /* decide whether to use internal or user-provided reg buffers. */ - if (!regs || rxb->no_sub) - { - search_state.best_lpspace = - (regoff_t *)REGEX_ALLOCATE (search_state.num_regs * sizeof(regoff_t)); - search_state.best_rpspace = - (regoff_t *)REGEX_ALLOCATE (search_state.num_regs * sizeof(regoff_t)); - search_state.best_lparen = search_state.best_lpspace; - search_state.best_rparen = search_state.best_rpspace; - } - else - { - /* have the register data arrays been allocated? */ - if (rxb->regs_allocated == REGS_UNALLOCATED) - { /* no. so allocate them with malloc. we need one - extra element beyond `search_state.num_regs' for the `-1' marker - gnu code uses. */ - regs->num_regs = MAX (RE_NREGS, rxb->re_nsub + 1); - regs->start = ((regoff_t *) - malloc (regs->num_regs * sizeof ( regoff_t))); - regs->end = ((regoff_t *) - malloc (regs->num_regs * sizeof ( regoff_t))); - if (regs->start == 0 || regs->end == 0) - return rx_search_error; - rxb->regs_allocated = REGS_REALLOCATE; - } - else if (rxb->regs_allocated == REGS_REALLOCATE) - { /* yes. if we need more elements than were already - allocated, reallocate them. if we need fewer, just - leave it alone. */ - if (regs->num_regs < search_state.num_regs + 1) - { - regs->num_regs = search_state.num_regs + 1; - regs->start = ((regoff_t *) - realloc (regs->start, - regs->num_regs * sizeof (regoff_t))); - regs->end = ((regoff_t *) - realloc (regs->end, - regs->num_regs * sizeof ( regoff_t))); - if (regs->start == 0 || regs->end == 0) - return rx_search_error; - } - } - else if (rxb->regs_allocated != REGS_FIXED) - return rx_search_error; - - if (regs->num_regs < search_state.num_regs + 1) - { - search_state.best_lpspace = - ((regoff_t *) - REGEX_ALLOCATE (search_state.num_regs * sizeof(regoff_t))); - search_state.best_rpspace = - ((regoff_t *) - REGEX_ALLOCATE (search_state.num_regs * sizeof(regoff_t))); - search_state.best_lparen = search_state.best_lpspace; - search_state.best_rparen = search_state.best_rpspace; - } - else - { - search_state.best_lparen = regs->start; - search_state.best_rparen = regs->end; - } - } - - search_state.lparen = - (regoff_t *) REGEX_ALLOCATE (search_state.num_regs * sizeof(regoff_t)); - search_state.rparen = - (regoff_t *) REGEX_ALLOCATE (search_state.num_regs * sizeof(regoff_t)); - - if (! ( search_state.best_rparen - && search_state.best_lparen - && search_state.lparen && search_state.rparen)) - return rx_search_error; - - search_state.best_last_l = search_state.best_last_r = -1; - - search_state.translate = (rxb->translate - ? rxb->translate - : rx_id_translation); - - - - /* - * two nfa's were compiled. - * `0' is complete. - * `1' faster but gets registers wrong and ends too soon. - */ - search_state.nfa_choice = (regs && !rxb->least_subs) ? '\0' : '\1'; - - /* we have the option to look for the best match or the first - * one we can find. if the user isn't asking for register information, - * we don't need to find the best match. - */ - search_state.first_found = !regs; - - if (range >= 0) - { - search_state.outer_pos.search_end = startpos + range; - search_state.outer_pos.search_direction = 1; - } - else - { - search_state.outer_pos.search_end = startpos + range; - search_state.outer_pos.search_direction = -1; - } - - /* the vacuous search always turns up nothing. */ - if ((search_state.outer_pos.search_direction == 1) - ? (startpos > search_state.outer_pos.search_end) - : (startpos < search_state.outer_pos.search_end)) - return rx_search_fail; - - /* now we build the starting state of the supernfa. */ - { - struct rx_superset * start_contents; - struct rx_nfa_state_set * start_nfa_set; - - /* we presume here that the nfa start state has only one - * possible future with no side effects. - */ - start_nfa_set = rxb->start->futures->destset; - if ( rxb->rx.start_set - && (rxb->rx.start_set->starts_for == &rxb->rx)) - start_contents = rxb->rx.start_set; - else - { - start_contents = - rx_superstate_eclosure_union (&rxb->rx, - rx_superset_cons (&rxb->rx, 0, 0), - start_nfa_set); - - if (!start_contents) - return rx_search_fail; - - start_contents->starts_for = &rxb->rx; - rxb->rx.start_set = start_contents; - } - if ( start_contents->superstate - && (start_contents->superstate->rx_id == rxb->rx.rx_id)) - { - search_state.start_super = start_contents->superstate; - rx_lock_superstate (&rxb->rx, search_state.start_super); - } - else - { - rx_protect_superset (&rxb->rx, start_contents); - - search_state.start_super = rx_superstate (&rxb->rx, start_contents); - if (!search_state.start_super) - return rx_search_fail; - rx_lock_superstate (&rxb->rx, search_state.start_super); - rx_release_superset (&rxb->rx, start_contents); - } - } - - - /* The outer_pos tracks the position within the strings - * as seen by loop that calls fastmap_search. - * - * The caller supplied get_burst function actually - * gives us pointers to chars. - * - * Communication with the get_burst function is through an - * rx_string_position structure. Here, the structure for - * outer_pos is initialized. It is set to point to the - * NULL string, at an offset of STARTPOS. STARTPOS is out - * of range of the NULL string, so the first call to - * getburst will patch up the rx_string_position to point - * to valid characters. - */ - - ( search_state.outer_pos.string - = search_state.outer_pos.end - = 0); - - search_state.outer_pos.offset = 0; - search_state.outer_pos.size = 0; - search_state.outer_pos.pos = (unsigned char *)startpos; - init_fastmap (rxb, &search_state); - - search_state.fastmap_resume_pt = rx_fastmap_start; - case rx_outer_fastmap: - /* do { */ - pseudo_do: - { - { - int fastmap_state; - fastmap_state = fastmap_search (rxb, stop, get_burst, app_closure, - &search_state); - switch (fastmap_state) - { - case rx_fastmap_continuation: - pc = rx_outer_fastmap; - goto return_continuation; - case rx_fastmap_fail: - goto finish; - case rx_fastmap_ok: - break; - } - } - - /* now the fastmap loop has brought us to a plausible - * starting point for a match. so, it's time to run the - * nfa and see if a match occured. - */ - startpos = ( search_state.outer_pos.pos - - search_state.outer_pos.string - + search_state.outer_pos.offset); -#if 0 -/*|*/ if ((range > 0) && (startpos == search_state.outer_pos.search_end)) -/*|*/ goto finish; -#endif - } - - search_state.test_match_resume_pt = rx_test_start; - /* do interrupted for entry point... */ - case rx_outer_test: - /* ...do continued */ - { - goto test_match; - test_returns_to_search: - switch (test_state) - { - case rx_test_continuation: - pc = rx_outer_test; - goto return_continuation; - case rx_test_error: - search_state.ret_val = rx_search_error; - goto finish; - case rx_test_fail: - break; - case rx_test_ok: - goto finish; - } - search_state.outer_pos.pos += search_state.outer_pos.search_direction; - startpos += search_state.outer_pos.search_direction; -#if 0 -/*|*/ if (search_state.test_pos.pos < search_state.test_pos.end) -/*|*/ break; -#endif - } - /* do interrupted for entry point... */ - case rx_outer_restore_pos: - { - int x; - x = get_burst (&search_state.outer_pos, app_closure, stop); - switch (x) - { - case rx_get_burst_continuation: - pc = rx_outer_restore_pos; - goto return_continuation; - case rx_get_burst_error: - search_state.ret_val = rx_search_error; - goto finish; - case rx_get_burst_no_more: - if (rxb->can_match_empty) - break; - goto finish; - case rx_get_burst_ok: - break; - } - } /* } while (...see below...) */ - - if ((search_state.outer_pos.search_direction == 1) - ? (startpos <= search_state.outer_pos.search_end) - : (startpos > search_state.outer_pos.search_end)) - goto pseudo_do; - - - finish: - uninit_fastmap (rxb, &search_state); - if (search_state.start_super) - rx_unlock_superstate (&rxb->rx, search_state.start_super); - -#ifdef regex_malloc - if (search_state.lparen) free (search_state.lparen); - if (search_state.rparen) free (search_state.rparen); - if (search_state.best_lpspace) free (search_state.best_lpspace); - if (search_state.best_rpspace) free (search_state.best_rpspace); -#endif - return search_state.ret_val; - } - - - test_match: - { - enum rx_test_match_entry test_pc; - int inx; - test_pc = search_state.test_match_resume_pt; - if (test_pc == rx_test_start) - { -#ifdef RX_DEBUG - search_state.backtrack_depth = 0; -#endif - search_state.last_l = search_state.last_r = 0; - search_state.lparen[0] = startpos; - search_state.super = search_state.start_super; - search_state.c = search_state.nfa_choice; - search_state.test_pos.pos = search_state.outer_pos.pos - 1; - search_state.test_pos.string = search_state.outer_pos.string; - search_state.test_pos.end = search_state.outer_pos.end; - search_state.test_pos.offset = search_state.outer_pos.offset; - search_state.test_pos.size = search_state.outer_pos.size; - search_state.test_pos.search_direction = 1; - search_state.counter_stack = 0; - search_state.backtrack_stack = 0; - search_state.backtrack_frame_bytes = - (sizeof (struct rx_backtrack_frame) - + (rxb->match_regs_on_stack - ? sizeof (regoff_t) * (search_state.num_regs + 1) * 2 - : 0)); - search_state.chunk_bytes = search_state.backtrack_frame_bytes * 64; - search_state.test_ret = rx_test_line_finished; - search_state.could_have_continued = 0; - } - /* This is while (1)...except that the body of the loop is interrupted - * by some alternative entry points. - */ - pseudo_while_1: - switch (test_pc) - { - case rx_test_cache_hit_loop: - goto resume_continuation_1; - case rx_test_backreference_check: - goto resume_continuation_2; - case rx_test_backtrack_return: - goto resume_continuation_3; - case rx_test_start: -#ifdef RX_DEBUG - /* There is a search tree with every node as set of deterministic - * transitions in the super nfa. For every branch of a - * backtrack point is an edge in the tree. - * This counts up a pre-order of nodes in that tree. - * It's saved on the search stack and printed when debugging. - */ - search_state.line_no = 0; - search_state.lines_found = 0; -#endif - - top_of_cycle: - /* A superstate is basicly a transition table, indexed by - * characters from the string being tested, and containing - * RX_INX (`instruction frame') structures. - */ - search_state.ifr = &search_state.super->transitions [search_state.c]; - - recurse_test_match: - /* This is the point to which control is sent when the - * test matcher `recurses'. Before jumping here, some variables - * need to be saved on the stack and the next instruction frame - * has to be computed. - */ - - restart: - /* Some instructions don't advance the matcher, but just - * carry out some side effects and fetch a new instruction. - * To dispatch that new instruction, `goto restart'. - */ - - { - struct rx_inx * next_tr_table; - struct rx_inx * this_tr_table; - /* The fastest route through the loop is when the instruction - * is RX_NEXT_CHAR. This case is detected when SEARCH_STATE.IFR->DATA - * is non-zero. In that case, it points to the next - * superstate. - * - * This allows us to not bother fetching the bytecode. - */ - next_tr_table = (struct rx_inx *)search_state.ifr->data; - this_tr_table = search_state.super->transitions; - while (next_tr_table) - { -#ifdef RX_DEBUG_0 - if (rx_debug_trace) - { - struct rx_superset * setp; - - fprintf (stderr, "%d %d>> re_next_char @ %d (%d)", - search_state.line_no, - search_state.backtrack_depth, - (search_state.test_pos.pos - search_state.test_pos.string - + search_state.test_pos.offset), search_state.c); - - search_state.super = - ((struct rx_superstate *) - ((char *)this_tr_table - - ((unsigned long) - ((struct rx_superstate *)0)->transitions))); - - setp = search_state.super->contents; - fprintf (stderr, " superstet (rx=%d, &=%x: ", - rxb->rx.rx_id, setp); - while (setp) - { - fprintf (stderr, "%d ", setp->id); - setp = setp->cdr; - } - fprintf (stderr, "\n"); - } -#endif - this_tr_table = next_tr_table; - ++search_state.test_pos.pos; - if (search_state.test_pos.pos == search_state.test_pos.end) - { - int burst_state; - try_burst_1: - burst_state = get_burst (&search_state.test_pos, - app_closure, stop); - switch (burst_state) - { - case rx_get_burst_continuation: - search_state.saved_this_tr_table = this_tr_table; - search_state.saved_next_tr_table = next_tr_table; - test_pc = rx_test_cache_hit_loop; - goto test_return_continuation; - - resume_continuation_1: - /* Continuation one jumps here to do its work: */ - search_state.saved_this_tr_table = this_tr_table; - search_state.saved_next_tr_table = next_tr_table; - goto try_burst_1; - - case rx_get_burst_ok: - /* get_burst succeeded...keep going */ - break; - - case rx_get_burst_no_more: - search_state.test_ret = rx_test_line_finished; - search_state.could_have_continued = 1; - goto test_do_return; - - case rx_get_burst_error: - /* An error... */ - search_state.test_ret = rx_test_internal_error; - goto test_do_return; - } - } - search_state.c = *search_state.test_pos.pos; - search_state.ifr = this_tr_table + search_state.c; - next_tr_table = (struct rx_inx *)search_state.ifr->data; - } /* Fast loop through cached transition tables */ - - /* Here when we ran out of cached next-char transitions. - * So, it will be necessary to do a more expensive - * dispatch on the current instruction. The superstate - * pointer is allowed to become invalid during next-char - * transitions -- now we must bring it up to date. - */ - search_state.super = - ((struct rx_superstate *) - ((char *)this_tr_table - - ((unsigned long) - ((struct rx_superstate *)0)->transitions))); - } - - /* We've encountered an instruction other than next-char. - * Dispatch that instruction: - */ - inx = (int)search_state.ifr->inx; -#ifdef RX_DEBUG_0 - if (rx_debug_trace) - { - struct rx_superset * setp = search_state.super->contents; - - fprintf (stderr, "%d %d>> %s @ %d (%d)", search_state.line_no, - search_state.backtrack_depth, - inx_names[inx], - (search_state.test_pos.pos - search_state.test_pos.string - + (test_pos.half == 0 ? 0 : size1)), search_state.c); - - fprintf (stderr, " superstet (rx=%d, &=%x: ", - rxb->rx.rx_id, setp); - while (setp) - { - fprintf (stderr, "%d ", setp->id); - setp = setp->cdr; - } - fprintf (stderr, "\n"); - } -#endif - switch ((enum rx_opcode)inx) - { - case rx_do_side_effects: - - /* RX_DO_SIDE_EFFECTS occurs when we cross epsilon - * edges associated with parentheses, backreferencing, etc. - */ - { - struct rx_distinct_future * df = - (struct rx_distinct_future *)search_state.ifr->data_2; - struct rx_se_list * el = df->effects; - /* Side effects come in lists. This walks down - * a list, dispatching. - */ - while (el) - { - long effect; - effect = (long)el->car; - if (effect < 0) - { -#ifdef RX_DEBUG_0 - if (rx_debug_trace) - { - struct rx_superset * setp = search_state.super->contents; - - fprintf (stderr, "....%d %d>> %s\n", search_state.line_no, - search_state.backtrack_depth, - efnames[-effect]); - } -#endif - switch ((enum re_side_effects) effect) - - { - case re_se_pushback: - search_state.ifr = &df->future_frame; - if (!search_state.ifr->data) - { - struct rx_superstate * sup; - sup = search_state.super; - rx_lock_superstate (rx, sup); - if (!rx_handle_cache_miss (&rxb->rx, - search_state.super, - search_state.c, - (search_state.ifr - ->data_2))) - { - rx_unlock_superstate (rx, sup); - search_state.test_ret = rx_test_internal_error; - goto test_do_return; - } - rx_unlock_superstate (rx, sup); - } - /* --search_state.test_pos.pos; */ - search_state.c = 't'; - search_state.super - = ((struct rx_superstate *) - ((char *)search_state.ifr->data - - (long)(((struct rx_superstate *)0) - ->transitions))); - goto top_of_cycle; - break; - case re_se_push0: - { - struct rx_counter_frame * old_cf - = (search_state.counter_stack - ? ((struct rx_counter_frame *) - search_state.counter_stack->sp) - : 0); - struct rx_counter_frame * cf; - PUSH (search_state.counter_stack, - sizeof (struct rx_counter_frame)); - cf = ((struct rx_counter_frame *) - search_state.counter_stack->sp); - cf->tag = re_se_iter; - cf->val = 0; - cf->inherited_from = 0; - cf->cdr = old_cf; - break; - } - case re_se_fail: - goto test_do_return; - case re_se_begbuf: - if (!AT_STRINGS_BEG ()) - goto test_do_return; - break; - case re_se_endbuf: - if (!AT_STRINGS_END ()) - goto test_do_return; - break; - case re_se_wordbeg: - if ( LETTER_P (&search_state.test_pos, 1) - && ( AT_STRINGS_BEG() - || !LETTER_P (&search_state.test_pos, 0))) - break; - else - goto test_do_return; - case re_se_wordend: - if ( !AT_STRINGS_BEG () - && LETTER_P (&search_state.test_pos, 0) - && (AT_STRINGS_END () - || !LETTER_P (&search_state.test_pos, 1))) - break; - else - goto test_do_return; - case re_se_wordbound: - if (AT_WORD_BOUNDARY (&search_state.test_pos)) - break; - else - goto test_do_return; - case re_se_notwordbound: - if (!AT_WORD_BOUNDARY (&search_state.test_pos)) - break; - else - goto test_do_return; - case re_se_hat: - if (AT_STRINGS_BEG ()) - { - if (rxb->not_bol) - goto test_do_return; - else - break; - } - else - { - char pos_c = *search_state.test_pos.pos; - if ( (SRCH_TRANSLATE (pos_c) - == SRCH_TRANSLATE('\n')) - && rxb->newline_anchor) - break; - else - goto test_do_return; - } - case re_se_dollar: - if (AT_STRINGS_END ()) - { - if (rxb->not_eol) - goto test_do_return; - else - break; - } - else - { - if ( ( SRCH_TRANSLATE (fetch_char - (&search_state.test_pos, 1, - app_closure, stop)) - == SRCH_TRANSLATE ('\n')) - && rxb->newline_anchor) - break; - else - goto test_do_return; - } - - case re_se_try: - /* This is the first side effect in every - * expression. - * - * FOR NO GOOD REASON...get rid of it... - */ - break; - - case re_se_pushpos: - { - int urhere = - ((int)(search_state.test_pos.pos - - search_state.test_pos.string) - + search_state.test_pos.offset); - struct rx_counter_frame * old_cf - = (search_state.counter_stack - ? ((struct rx_counter_frame *) - search_state.counter_stack->sp) - : 0); - struct rx_counter_frame * cf; - PUSH(search_state.counter_stack, - sizeof (struct rx_counter_frame)); - cf = ((struct rx_counter_frame *) - search_state.counter_stack->sp); - cf->tag = re_se_pushpos; - cf->val = urhere; - cf->inherited_from = 0; - cf->cdr = old_cf; - break; - } - - case re_se_chkpos: - { - int urhere = - ((int)(search_state.test_pos.pos - - search_state.test_pos.string) - + search_state.test_pos.offset); - struct rx_counter_frame * cf - = ((struct rx_counter_frame *) - search_state.counter_stack->sp); - if (cf->val == urhere) - goto test_do_return; - cf->val = urhere; - break; - } - break; - - case re_se_poppos: - POP(search_state.counter_stack, - sizeof (struct rx_counter_frame)); - break; - - - case re_se_at_dot: - case re_se_syntax: - case re_se_not_syntax: -#ifdef emacs - /* - * this release lacks emacs support - */ -#endif - break; - case re_se_win: - case re_se_lparen: - case re_se_rparen: - case re_se_backref: - case re_se_iter: - case re_se_end_iter: - case re_se_tv: - case re_floogle_flap: - search_state.ret_val = 0; - goto test_do_return; - } - } - else - { -#ifdef RX_DEBUG_0 - if (rx_debug_trace) - fprintf (stderr, "....%d %d>> %s %d %d\n", search_state.line_no, - search_state.backtrack_depth, - efnames2[rxb->se_params [effect].se], - rxb->se_params [effect].op1, - rxb->se_params [effect].op2); -#endif - switch (rxb->se_params [effect].se) - { - case re_se_win: - /* This side effect indicates that we've - * found a match, though not necessarily the - * best match. This is a fancy assignment to - * register 0 unless the caller didn't - * care about registers. In which case, - * this stops the match. - */ - { - int urhere = - ((int)(search_state.test_pos.pos - - search_state.test_pos.string) - + search_state.test_pos.offset); - - if ( (search_state.best_last_r < 0) - || (urhere + 1 > search_state.best_rparen[0])) - { - /* Record the best known and keep - * looking. - */ - int x; - for (x = 0; x <= search_state.last_l; ++x) - search_state.best_lparen[x] = search_state.lparen[x]; - search_state.best_last_l = search_state.last_l; - for (x = 0; x <= search_state.last_r; ++x) - search_state.best_rparen[x] = search_state.rparen[x]; - search_state.best_rparen[0] = urhere + 1; - search_state.best_last_r = search_state.last_r; - } - /* If we're not reporting the match-length - * or other register info, we need look no - * further. - */ - if (search_state.first_found) - { - search_state.test_ret = rx_test_found_first; - goto test_do_return; - } - } - break; - case re_se_lparen: - { - int urhere = - ((int)(search_state.test_pos.pos - - search_state.test_pos.string) - + search_state.test_pos.offset); - - int reg = rxb->se_params [effect].op1; -#if 0 - if (reg > search_state.last_l) -#endif - { - search_state.lparen[reg] = urhere + 1; - /* In addition to making this assignment, - * we now know that lower numbered regs - * that haven't already been assigned, - * won't be. We make sure they're - * filled with -1, so they can be - * recognized as unassigned. - */ - if (search_state.last_l < reg) - while (++search_state.last_l < reg) - search_state.lparen[search_state.last_l] = -1; - } - break; - } - - case re_se_rparen: - { - int urhere = - ((int)(search_state.test_pos.pos - - search_state.test_pos.string) - + search_state.test_pos.offset); - int reg = rxb->se_params [effect].op1; - search_state.rparen[reg] = urhere + 1; - if (search_state.last_r < reg) - { - while (++search_state.last_r < reg) - search_state.rparen[search_state.last_r] - = -1; - } - break; - } - - case re_se_backref: - { - int reg = rxb->se_params [effect].op1; - if ( reg > search_state.last_r - || search_state.rparen[reg] < 0) - goto test_do_return; - - { - int backref_status; - check_backreference: - backref_status - = back_check (&search_state.test_pos, - search_state.lparen[reg], - search_state.rparen[reg], - search_state.translate, - app_closure, - stop); - switch (backref_status) - { - case rx_back_check_continuation: - search_state.saved_reg = reg; - test_pc = rx_test_backreference_check; - goto test_return_continuation; - resume_continuation_2: - reg = search_state.saved_reg; - goto check_backreference; - case rx_back_check_fail: - /* Fail */ - goto test_do_return; - case rx_back_check_pass: - /* pass -- - * test_pos now advanced to last - * char matched by backref - */ - break; - } - } - break; - } - case re_se_iter: - { - struct rx_counter_frame * csp - = ((struct rx_counter_frame *) - search_state.counter_stack->sp); - if (csp->val == rxb->se_params[effect].op2) - goto test_do_return; - else - ++csp->val; - break; - } - case re_se_end_iter: - { - struct rx_counter_frame * csp - = ((struct rx_counter_frame *) - search_state.counter_stack->sp); - if (csp->val < rxb->se_params[effect].op1) - goto test_do_return; - else - { - struct rx_counter_frame * source = csp; - while (source->inherited_from) - source = source->inherited_from; - if (!source || !source->cdr) - { - POP(search_state.counter_stack, - sizeof(struct rx_counter_frame)); - } - else - { - source = source->cdr; - csp->val = source->val; - csp->tag = source->tag; - csp->cdr = 0; - csp->inherited_from = source; - } - } - break; - } - case re_se_tv: - /* is a noop */ - break; - case re_se_try: - case re_se_pushback: - case re_se_push0: - case re_se_pushpos: - case re_se_chkpos: - case re_se_poppos: - case re_se_at_dot: - case re_se_syntax: - case re_se_not_syntax: - case re_se_begbuf: - case re_se_hat: - case re_se_wordbeg: - case re_se_wordbound: - case re_se_notwordbound: - case re_se_wordend: - case re_se_endbuf: - case re_se_dollar: - case re_se_fail: - case re_floogle_flap: - search_state.ret_val = 0; - goto test_do_return; - } - } - el = el->cdr; - } - /* Now the side effects are done, - * so get the next instruction. - * and move on. - */ - search_state.ifr = &df->future_frame; - goto restart; - } - - case rx_backtrack_point: - { - /* A backtrack point indicates that we've reached a - * non-determinism in the superstate NFA. This is a - * loop that exhaustively searches the possibilities. - * - * A backtracking strategy is used. We keep track of what - * registers are valid so we can erase side effects. - * - * First, make sure there is some stack space to hold - * our state. - */ - - struct rx_backtrack_frame * bf; - - PUSH(search_state.backtrack_stack, - search_state.backtrack_frame_bytes); -#ifdef RX_DEBUG_0 - ++search_state.backtrack_depth; -#endif - - bf = ((struct rx_backtrack_frame *) - search_state.backtrack_stack->sp); - { - bf->stk_super = search_state.super; - /* We prevent the current superstate from being - * deleted from the superstate cache. - */ - rx_lock_superstate (&rxb->rx, search_state.super); -#ifdef RX_DEBUG_0 - bf->stk_search_state.line_no = search_state.line_no; -#endif - bf->stk_c = search_state.c; - bf->stk_test_pos = search_state.test_pos; - bf->stk_last_l = search_state.last_l; - bf->stk_last_r = search_state.last_r; - bf->df = ((struct rx_super_edge *) - search_state.ifr->data_2)->options; - bf->first_df = bf->df; - bf->counter_stack_sp = (search_state.counter_stack - ? search_state.counter_stack->sp - : 0); - bf->stk_test_ret = search_state.test_ret; - if (rxb->match_regs_on_stack) - { - int x; - regoff_t * stk = - (regoff_t *)((char *)bf + sizeof (*bf)); - for (x = 0; x <= search_state.last_l; ++x) - stk[x] = search_state.lparen[x]; - stk += x; - for (x = 0; x <= search_state.last_r; ++x) - stk[x] = search_state.rparen[x]; - } - } - - /* Here is a while loop whose body is mainly a function - * call and some code to handle a return from that - * function. - * - * From here on for the rest of `case backtrack_point' it - * is unsafe to assume that the search_state copies of - * variables saved on the backtracking stack are valid - * -- so read their values from the backtracking stack. - * - * This lets us use one generation fewer stack saves in - * the call-graph of a search. - */ - - while_non_det_options: -#ifdef RX_DEBUG_0 - ++search_state.lines_found; - if (rx_debug_trace) - fprintf (stderr, "@@@ %d calls %d @@@\n", - search_state.line_no, search_state.lines_found); - - search_state.line_no = search_state.lines_found; -#endif - - if (bf->df->next_same_super_edge[0] == bf->first_df) - { - /* This is a tail-call optimization -- we don't recurse - * for the last of the possible futures. - */ - search_state.ifr = (bf->df->effects - ? &bf->df->side_effects_frame - : &bf->df->future_frame); - - rx_unlock_superstate (&rxb->rx, search_state.super); - POP(search_state.backtrack_stack, - search_state.backtrack_frame_bytes); -#ifdef RX_DEBUG - --search_state.backtrack_depth; -#endif - goto restart; - } - else - { - if (search_state.counter_stack) - { - struct rx_counter_frame * old_cf - = ((struct rx_counter_frame *)search_state.counter_stack->sp); - struct rx_counter_frame * cf; - PUSH(search_state.counter_stack, sizeof (struct rx_counter_frame)); - cf = ((struct rx_counter_frame *)search_state.counter_stack->sp); - cf->tag = old_cf->tag; - cf->val = old_cf->val; - cf->inherited_from = old_cf; - cf->cdr = 0; - } - /* `Call' this test-match block */ - search_state.ifr = (bf->df->effects - ? &bf->df->side_effects_frame - : &bf->df->future_frame); - goto recurse_test_match; - } - - /* Returns in this block are accomplished by - * goto test_do_return. There are two cases. - * If there is some search-stack left, - * then it is a return from a `recursive' call. - * If there is no search-stack left, then - * we should return to the fastmap/search loop. - */ - - test_do_return: - - if (!search_state.backtrack_stack) - { -#ifdef RX_DEBUG_0 - if (rx_debug_trace) - fprintf (stderr, "!!! %d bails returning %d !!!\n", - search_state.line_no, search_state.test_ret); -#endif - - /* No more search-stack -- this test is done. */ - if (search_state.test_ret != rx_test_internal_error) - goto return_from_test_match; - else - goto error_in_testing_match; - } - - /* Returning from a recursive call to - * the test match block: - */ - - bf = ((struct rx_backtrack_frame *) - search_state.backtrack_stack->sp); -#ifdef RX_DEBUG_0 - if (rx_debug_trace) - fprintf (stderr, "+++ %d returns %d (to %d)+++\n", - search_state.line_no, - search_state.test_ret, - bf->stk_search_state.line_no); -#endif - - while (search_state.counter_stack - && (!bf->counter_stack_sp - || (bf->counter_stack_sp - != search_state.counter_stack->sp))) - { - POP(search_state.counter_stack, - sizeof (struct rx_counter_frame)); - } - - if (search_state.test_ret == rx_test_internal_error) - { - POP (search_state.backtrack_stack, - search_state.backtrack_frame_bytes); - search_state.test_ret = rx_test_internal_error; - goto test_do_return; - } - - /* If a non-longest match was found and that is good - * enough, return immediately. - */ - if ( (search_state.test_ret == rx_test_found_first) - && search_state.first_found) - { - rx_unlock_superstate (&rxb->rx, bf->stk_super); - POP (search_state.backtrack_stack, - search_state.backtrack_frame_bytes); - goto test_do_return; - } - - search_state.test_ret = bf->stk_test_ret; - search_state.last_l = bf->stk_last_l; - search_state.last_r = bf->stk_last_r; - bf->df = bf->df->next_same_super_edge[0]; - search_state.super = bf->stk_super; - search_state.c = bf->stk_c; -#ifdef RX_DEBUG_0 - search_state.line_no = bf->stk_search_state.line_no; -#endif - - if (rxb->match_regs_on_stack) - { - int x; - regoff_t * stk = - (regoff_t *)((char *)bf + sizeof (*bf)); - for (x = 0; x <= search_state.last_l; ++x) - search_state.lparen[x] = stk[x]; - stk += x; - for (x = 0; x <= search_state.last_r; ++x) - search_state.rparen[x] = stk[x]; - } - - { - int x; - try_burst_2: - x = get_burst (&bf->stk_test_pos, app_closure, stop); - switch (x) - { - case rx_get_burst_continuation: - search_state.saved_bf = bf; - test_pc = rx_test_backtrack_return; - goto test_return_continuation; - resume_continuation_3: - bf = search_state.saved_bf; - goto try_burst_2; - case rx_get_burst_no_more: - /* Since we've been here before, it is some kind of - * error that we can't return. - */ - case rx_get_burst_error: - search_state.test_ret = rx_test_internal_error; - goto test_do_return; - case rx_get_burst_ok: - break; - } - } - search_state.test_pos = bf->stk_test_pos; - goto while_non_det_options; - } - - - case rx_cache_miss: - /* Because the superstate NFA is lazily constructed, - * and in fact may erode from underneath us, we sometimes - * have to construct the next instruction from the hard way. - * This invokes one step in the lazy-conversion. - */ - search_state.ifr = rx_handle_cache_miss (&rxb->rx, - search_state.super, - search_state.c, - search_state.ifr->data_2); - if (!search_state.ifr) - { - search_state.test_ret = rx_test_internal_error; - goto test_do_return; - } - goto restart; - - case rx_backtrack: - /* RX_BACKTRACK means that we've reached the empty - * superstate, indicating that match can't succeed - * from this point. - */ - goto test_do_return; - - case rx_next_char: - case rx_error_inx: - case rx_num_instructions: - search_state.ret_val = 0; - goto test_do_return; - } - goto pseudo_while_1; - } - - /* Healthy exits from the test-match loop do a - * `goto return_from_test_match' On the other hand, - * we might end up here. - */ - error_in_testing_match: - test_state = rx_test_error; - goto test_returns_to_search; - - /***** fastmap/search loop body - * considering the results testing for a match - */ - - return_from_test_match: - - if (search_state.best_last_l >= 0) - { - if (regs && (regs->start != search_state.best_lparen)) - { - bcopy (search_state.best_lparen, regs->start, - regs->num_regs * sizeof (int)); - bcopy (search_state.best_rparen, regs->end, - regs->num_regs * sizeof (int)); - } - if (regs && !rxb->no_sub) - { - int q; - int bound = (regs->num_regs > search_state.num_regs - ? regs->num_regs - : search_state.num_regs); - regoff_t * s = regs->start; - regoff_t * e = regs->end; - for (q = search_state.best_last_l + 1; q < bound; ++q) - s[q] = e[q] = -1; - } - search_state.ret_val = search_state.best_lparen[0]; - test_state = rx_test_ok; - goto test_returns_to_search; - } - else - { - test_state = rx_test_fail; - goto test_returns_to_search; - } - - test_return_continuation: - search_state.test_match_resume_pt = test_pc; - test_state = rx_test_continuation; - goto test_returns_to_search; - } -} - - - -#endif /* RX_WANT_RX_DEFS */ - - - -#else /* RX_WANT_SE_DEFS */ - /* Integers are used to represent side effects. - * - * Simple side effects are given negative integer names by these enums. - * - * Non-negative names are reserved for complex effects. - * - * Complex effects are those that take arguments. For example, - * a register assignment associated with a group is complex because - * it requires an argument to tell which group is being matched. - * - * The integer name of a complex effect is an index into rxb->se_params. - */ - - RX_DEF_SE(1, re_se_try, = -1) /* Epsilon from start state */ - - RX_DEF_SE(0, re_se_pushback, = re_se_try - 1) - RX_DEF_SE(0, re_se_push0, = re_se_pushback -1) - RX_DEF_SE(0, re_se_pushpos, = re_se_push0 - 1) - RX_DEF_SE(0, re_se_chkpos, = re_se_pushpos -1) - RX_DEF_SE(0, re_se_poppos, = re_se_chkpos - 1) - - RX_DEF_SE(1, re_se_at_dot, = re_se_poppos - 1) /* Emacs only */ - RX_DEF_SE(0, re_se_syntax, = re_se_at_dot - 1) /* Emacs only */ - RX_DEF_SE(0, re_se_not_syntax, = re_se_syntax - 1) /* Emacs only */ - - RX_DEF_SE(1, re_se_begbuf, = re_se_not_syntax - 1) /* match beginning of buffer */ - RX_DEF_SE(1, re_se_hat, = re_se_begbuf - 1) /* match beginning of line */ - - RX_DEF_SE(1, re_se_wordbeg, = re_se_hat - 1) - RX_DEF_SE(1, re_se_wordbound, = re_se_wordbeg - 1) - RX_DEF_SE(1, re_se_notwordbound, = re_se_wordbound - 1) - - RX_DEF_SE(1, re_se_wordend, = re_se_notwordbound - 1) - RX_DEF_SE(1, re_se_endbuf, = re_se_wordend - 1) - - /* This fails except at the end of a line. - * It deserves to go here since it is typicly one of the last steps - * in a match. - */ - RX_DEF_SE(1, re_se_dollar, = re_se_endbuf - 1) - - /* Simple effects: */ - RX_DEF_SE(1, re_se_fail, = re_se_dollar - 1) - - /* Complex effects. These are used in the 'se' field of - * a struct re_se_params. Indexes into the se array - * are stored as instructions on nfa edges. - */ - RX_DEF_CPLX_SE(1, re_se_win, = 0) - RX_DEF_CPLX_SE(1, re_se_lparen, = re_se_win + 1) - RX_DEF_CPLX_SE(1, re_se_rparen, = re_se_lparen + 1) - RX_DEF_CPLX_SE(0, re_se_backref, = re_se_rparen + 1) - RX_DEF_CPLX_SE(0, re_se_iter, = re_se_backref + 1) - RX_DEF_CPLX_SE(0, re_se_end_iter, = re_se_iter + 1) - RX_DEF_CPLX_SE(0, re_se_tv, = re_se_end_iter + 1) - -#endif - -#endif