Mercurial > hg > octave-nkf
changeset 16259:0b5ab09dfce4
2/10 commits reworking the lexer
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Mon, 11 Mar 2013 14:18:39 -0400 |
parents | db7f07b22b9b |
children | 6c211b8cfbd9 b45a90cdb0ae |
files | libinterp/parse-tree/lex.h libinterp/parse-tree/lex.ll libinterp/parse-tree/oct-parse.in.yy |
diffstat | 3 files changed, 12 insertions(+), 657 deletions(-) [+] |
line wrap: on
line diff
--- a/libinterp/parse-tree/lex.h +++ b/libinterp/parse-tree/lex.h @@ -63,23 +63,6 @@ { public: - // Did eat_whitespace or eat_continuation eat a space or tab, or a - // newline, or both? - // - // Functions that return this type will return a logical OR of the - // following values: - // - // NO_WHITESPACE no spaces to eat - // SPACE_OR_TAB space or tab in input - // NEWLINE bare new line in input - - enum whitespace_type - { - NO_WHITESPACE = 1, - SPACE_OR_TAB = 2, - NEWLINE = 4 - }; - // Track nesting of square brackets, curly braces, and parentheses. class bbp_nesting_level @@ -244,8 +227,7 @@ }; lexical_feedback (void) - : end_of_input (false), convert_spaces_to_comma (true), - do_comma_insert (false), at_beginning_of_statement (true), + : end_of_input (false), at_beginning_of_statement (true), looking_at_anon_fcn_args (false), looking_at_return_list (false), looking_at_parameter_list (false), looking_at_decl_list (false), looking_at_initializer_expression (false), @@ -289,13 +271,6 @@ // true means that we have encountered eof on the input stream. bool end_of_input; - // true means that we should convert spaces to a comma inside a - // matrix definition. - bool convert_spaces_to_comma; - - // gag. stupid kludge so that [[1,2][3,4]] will work. - bool do_comma_insert; - // true means we are at the beginning of a statement, where a // command name is possible. bool at_beginning_of_statement; @@ -499,32 +474,18 @@ int flex_yyleng (void); - void do_comma_insert_check (void); - int text_yyinput (void); void xunput (char c, char *buf); void xunput (char c); - void fixup_column_count (char *s); - bool inside_any_object_index (void); int is_keyword_token (const std::string& s); bool is_variable (const std::string& name); - bool next_token_is_sep_op (void); - - bool next_token_is_postfix_unary_op (bool spc_prev); - - bool next_token_is_bin_op (bool spc_prev); - - void scan_for_comments (const char *text); - - int eat_whitespace (void); - bool whitespace_is_significant (void); void handle_number (void); @@ -538,17 +499,9 @@ bool have_ellipsis_continuation (bool trailing_comments_ok = true); - int eat_continuation (void); - int handle_string (char delim); - bool next_token_is_assign_op (void); - - bool next_token_is_index_op (void); - - int handle_close_bracket (bool spc_gobbled, int bracket_type); - - void maybe_unput_comma (int spc_gobbled); + int handle_close_bracket (int bracket_type); bool next_token_can_follow_bin_op (void);
--- a/libinterp/parse-tree/lex.ll +++ b/libinterp/parse-tree/lex.ll @@ -194,8 +194,6 @@ curr_lexer->input_line_number++; curr_lexer->current_input_column = 1; - curr_lexer->quote_is_transpose = false; - curr_lexer->convert_spaces_to_comma = true; curr_lexer->looking_for_object_index = false; curr_lexer->at_beginning_of_statement = true; @@ -278,18 +276,12 @@ <MATRIX_START>\] { curr_lexer->lexer_debug ("<MATRIX_START>\\]"); - curr_lexer->scan_for_comments (yytext); - curr_lexer->fixup_column_count (yytext); - curr_lexer->looking_at_object_index.pop_front (); curr_lexer->looking_for_object_index = true; curr_lexer->at_beginning_of_statement = false; - int c = yytext[yyleng-1]; - bool cont_is_spc = (curr_lexer->eat_continuation () != octave_lexer::NO_WHITESPACE); - bool spc_gobbled = (cont_is_spc || c == ' ' || c == '\t'); - int tok_to_return = curr_lexer->handle_close_bracket (spc_gobbled, ']'); + int tok_to_return = curr_lexer->handle_close_bracket (']'); return curr_lexer->count_token (']'); } @@ -301,18 +293,12 @@ <MATRIX_START>\} { curr_lexer->lexer_debug ("<MATRIX_START>\\}*"); - curr_lexer->scan_for_comments (yytext); - curr_lexer->fixup_column_count (yytext); - curr_lexer->looking_at_object_index.pop_front (); curr_lexer->looking_for_object_index = true; curr_lexer->at_beginning_of_statement = false; - int c = yytext[yyleng-1]; - bool cont_is_spc = (curr_lexer->eat_continuation () != octave_lexer::NO_WHITESPACE); - bool spc_gobbled = (cont_is_spc || c == ' ' || c == '\t'); - int tok_to_return = curr_lexer->handle_close_bracket (spc_gobbled, '}'); + int tok_to_return = curr_lexer->handle_close_bracket ('}'); return curr_lexer->count_token ('}'); } @@ -325,8 +311,6 @@ curr_lexer->looking_at_object_index.push_front (false); curr_lexer->current_input_column += yyleng; - curr_lexer->quote_is_transpose = false; - curr_lexer->convert_spaces_to_comma = true; curr_lexer->looking_for_object_index = false; curr_lexer->at_beginning_of_statement = false; @@ -574,16 +558,18 @@ } %{ -// Identifiers. Truncate the token at the first space or tab but -// don't write directly on yytext. +// Identifiers. %} {IDENT} { curr_lexer->lexer_debug ("{IDENT}"); + int tok = curr_lexer->previous_token_value (); + if (curr_lexer->whitespace_is_significant () && curr_lexer->space_follows_previous_token () - && ! curr_lexer->previous_token_is_binop ()) + && ! (tok == '[' || tok == '{' + || curr_lexer->previous_token_is_binop ())) { yyless (0); unput (','); @@ -650,8 +636,6 @@ curr_lexer->current_input_column++; - curr_lexer->quote_is_transpose = false; - curr_lexer->convert_spaces_to_comma = false; curr_lexer->looking_at_function_handle++; curr_lexer->looking_for_object_index = false; curr_lexer->at_beginning_of_statement = false; @@ -672,9 +656,6 @@ curr_lexer->input_line_number++; curr_lexer->current_input_column = 1; - curr_lexer->quote_is_transpose = false; - curr_lexer->convert_spaces_to_comma = true; - if (curr_lexer->nesting_level.none ()) { curr_lexer->at_beginning_of_statement = true; @@ -799,19 +780,16 @@ } ".'" { - curr_lexer->do_comma_insert_check (); return curr_lexer->handle_op (".'", TRANSPOSE, true, false); } "++" { - curr_lexer->do_comma_insert_check (); return curr_lexer->handle_incompatible_op ("++", PLUS_PLUS, true, false, true); } "--" { ; - curr_lexer->do_comma_insert_check (); return curr_lexer->handle_incompatible_op ("--", MINUS_MINUS, true, false, true); } @@ -845,18 +823,12 @@ curr_lexer->looking_at_object_index.pop_front (); - curr_lexer->quote_is_transpose = true; - curr_lexer->convert_spaces_to_comma - = (curr_lexer->nesting_level.is_bracket_or_brace () - && ! curr_lexer->looking_at_anon_fcn_args); curr_lexer->looking_for_object_index = true; curr_lexer->at_beginning_of_statement = false; if (curr_lexer->looking_at_anon_fcn_args) curr_lexer->looking_at_anon_fcn_args = false; - curr_lexer->do_comma_insert_check (); - return curr_lexer->count_token (')'); } @@ -1110,13 +1082,10 @@ (curr_lexer->looking_for_object_index); curr_lexer->current_input_column += yyleng; - curr_lexer->quote_is_transpose = false; - curr_lexer->convert_spaces_to_comma = true; curr_lexer->looking_for_object_index = false; curr_lexer->at_beginning_of_statement = false; curr_lexer->decrement_promptflag (); - curr_lexer->eat_whitespace (); curr_lexer->braceflag++; @@ -1506,8 +1475,6 @@ lexical_feedback::reset (void) { end_of_input = false; - convert_spaces_to_comma = true; - do_comma_insert = false; at_beginning_of_statement = true; looking_at_anon_fcn_args = false; looking_at_return_list = false; @@ -1520,7 +1487,6 @@ parsing_class_method = false; maybe_classdef_get_set_method = false; parsing_classdef = false; - quote_is_transpose = false; force_script = false; reading_fcn_file = false; reading_script_file = false; @@ -1784,27 +1750,6 @@ return yyget_leng (scanner); } -// GAG. -// -// If we're reading a matrix and the next character is '[', make sure -// that we insert a comma ahead of it. - -void -octave_lexer::do_comma_insert_check (void) -{ - bool spc_gobbled = (eat_continuation () != octave_lexer::NO_WHITESPACE); - - int c = text_yyinput (); - - xunput (c); - - if (spc_gobbled) - xunput (' '); - - do_comma_insert = (! looking_at_object_index.front () - && bracketflag && c == '['); -} - int octave_lexer::text_yyinput (void) { @@ -1870,25 +1815,6 @@ xunput (c, yytxt); } -// If we read some newlines, we need figure out what column we're -// really looking at. - -void -octave_lexer::fixup_column_count (char *s) -{ - char c; - while ((c = *s++) != '\0') - { - if (c == '\n') - { - input_line_number++; - current_input_column = 1; - } - else - current_input_column++; - } -} - bool octave_lexer::inside_any_object_index (void) { @@ -2147,342 +2073,6 @@ != pending_local_variables.end ())); } -// Recognize separators. If the separator is a CRLF pair, it is -// replaced by a single LF. - -bool -octave_lexer::next_token_is_sep_op (void) -{ - bool retval = false; - - int c = text_yyinput (); - - retval = match_any (c, ",;\n]"); - - xunput (c); - - return retval; -} - -// Try to determine if the next token should be treated as a postfix -// unary operator. This is ugly, but it seems to do the right thing. - -bool -octave_lexer::next_token_is_postfix_unary_op (bool spc_prev) -{ - bool un_op = false; - - int c0 = text_yyinput (); - - if (c0 == '\'' && ! spc_prev) - { - un_op = true; - } - else if (c0 == '.') - { - int c1 = text_yyinput (); - un_op = (c1 == '\''); - xunput (c1); - } - else if (c0 == '+') - { - int c1 = text_yyinput (); - un_op = (c1 == '+'); - xunput (c1); - } - else if (c0 == '-') - { - int c1 = text_yyinput (); - un_op = (c1 == '-'); - xunput (c1); - } - - xunput (c0); - - return un_op; -} - -// Try to determine if the next token should be treated as a binary -// operator. -// -// This kluge exists because whitespace is not always ignored inside -// the square brackets that are used to create matrix objects (though -// spacing only really matters in the cases that can be interpreted -// either as binary ops or prefix unary ops: currently just +, -). -// -// Note that a line continuation directly following a + or - operator -// (e.g., the characters '[' 'a' ' ' '+' '\' LFD 'b' ']') will be -// parsed as a binary operator. - -bool -octave_lexer::next_token_is_bin_op (bool spc_prev) -{ - bool bin_op = false; - - int c0 = text_yyinput (); - - switch (c0) - { - case '+': - case '-': - { - int c1 = text_yyinput (); - - switch (c1) - { - case '+': - case '-': - // Unary ops, spacing doesn't matter. - break; - - case '=': - // Binary ops, spacing doesn't matter. - bin_op = true; - break; - - default: - // Could be either, spacing matters. - bin_op = looks_like_bin_op (spc_prev, c1); - break; - } - - xunput (c1); - } - break; - - case ':': - case '/': - case '\\': - case '^': - // Always a binary op (may also include /=, \=, and ^=). - bin_op = true; - break; - - // .+ .- ./ .\ .^ .* .** - case '.': - { - int c1 = text_yyinput (); - - if (match_any (c1, "+-/\\^*")) - // Always a binary op (may also include .+=, .-=, ./=, ...). - bin_op = true; - else if (! isdigit (c1) && c1 != ' ' && c1 != '\t' && c1 != '.') - // A structure element reference is a binary op. - bin_op = true; - - xunput (c1); - } - break; - - // = == & && | || * ** - case '=': - case '&': - case '|': - case '*': - // Always a binary op (may also include ==, &&, ||, **). - bin_op = true; - break; - - // < <= <> > >= - case '<': - case '>': - // Always a binary op (may also include <=, <>, >=). - bin_op = true; - break; - - // ~= != - case '~': - case '!': - { - int c1 = text_yyinput (); - - // ~ and ! can be unary ops, so require following =. - if (c1 == '=') - bin_op = true; - - xunput (c1); - } - break; - - default: - break; - } - - xunput (c0); - - return bin_op; -} - -// FIXME -- we need to handle block comments here. - -void -octave_lexer::scan_for_comments (const char *text) -{ - std::string comment_buf; - - bool in_comment = false; - bool beginning_of_comment = false; - - int len = strlen (text); - int i = 0; - - while (i < len) - { - char c = text[i++]; - - switch (c) - { - case '%': - case '#': - if (in_comment) - { - if (! beginning_of_comment) - comment_buf += static_cast<char> (c); - } - else - { - maybe_gripe_matlab_incompatible_comment (c); - in_comment = true; - beginning_of_comment = true; - } - break; - - case '\n': - if (in_comment) - { - comment_buf += static_cast<char> (c); - octave_comment_buffer::append (comment_buf); - comment_buf.resize (0); - in_comment = false; - beginning_of_comment = false; - } - break; - - default: - if (in_comment) - { - comment_buf += static_cast<char> (c); - beginning_of_comment = false; - } - break; - } - } - - if (! comment_buf.empty ()) - octave_comment_buffer::append (comment_buf); -} - -// Discard whitespace, including comments and continuations. - -// FIXME -- we need to handle block comments here. - -int -octave_lexer::eat_whitespace (void) -{ - int retval = octave_lexer::NO_WHITESPACE; - - std::string comment_buf; - - bool in_comment = false; - bool beginning_of_comment = false; - - int c = 0; - - while ((c = text_yyinput ()) != EOF) - { - current_input_column++; - - switch (c) - { - case ' ': - case '\t': - if (in_comment) - { - comment_buf += static_cast<char> (c); - beginning_of_comment = false; - } - retval |= octave_lexer::SPACE_OR_TAB; - break; - - case '\n': - retval |= octave_lexer::NEWLINE; - if (in_comment) - { - comment_buf += static_cast<char> (c); - octave_comment_buffer::append (comment_buf); - comment_buf.resize (0); - in_comment = false; - beginning_of_comment = false; - } - current_input_column = 0; - break; - - case '#': - case '%': - if (in_comment) - { - if (! beginning_of_comment) - comment_buf += static_cast<char> (c); - } - else - { - maybe_gripe_matlab_incompatible_comment (c); - in_comment = true; - beginning_of_comment = true; - } - break; - - case '.': - if (in_comment) - { - comment_buf += static_cast<char> (c); - beginning_of_comment = false; - break; - } - else - { - if (have_ellipsis_continuation ()) - break; - else - goto done; - } - - case '\\': - if (in_comment) - { - comment_buf += static_cast<char> (c); - beginning_of_comment = false; - break; - } - else - { - if (have_continuation ()) - break; - else - goto done; - } - - default: - if (in_comment) - { - comment_buf += static_cast<char> (c); - beginning_of_comment = false; - break; - } - else - goto done; - } - } - - if (! comment_buf.empty ()) - octave_comment_buffer::append (comment_buf); - - done: - xunput (c); - current_input_column--; - return retval; -} - bool octave_lexer::whitespace_is_significant (void) { @@ -2531,8 +2121,6 @@ assert (nread == 1); - quote_is_transpose = true; - convert_spaces_to_comma = true; looking_for_object_index = false; at_beginning_of_statement = false; @@ -2540,8 +2128,6 @@ current_input_column)); current_input_column += flex_yyleng (); - - do_comma_insert_check (); } void @@ -2614,8 +2200,6 @@ comment_text = ""; - quote_is_transpose = false; - convert_spaces_to_comma = true; at_beginning_of_statement = true; if (! looking_at_continuation) @@ -2742,25 +2326,6 @@ return false; } -// See if we have a continuation line. If so, eat it and the leading -// whitespace on the next line. - -int -octave_lexer::eat_continuation (void) -{ - int retval = octave_lexer::NO_WHITESPACE; - - int c = text_yyinput (); - - if ((c == '.' && have_ellipsis_continuation ()) - || (c == '\\' && have_continuation ())) - retval = eat_whitespace (); - else - xunput (c); - - return retval; -} - int octave_lexer::handle_string (char delim) { @@ -2826,9 +2391,6 @@ else s = do_string_escapes (buf.str ()); - quote_is_transpose = true; - convert_spaces_to_comma = true; - if (delim == '"') gripe_matlab_incompatible ("\" used as string delimiter"); else if (delim == '\'') @@ -2856,100 +2418,8 @@ return LEXICAL_ERROR; } -bool -octave_lexer::next_token_is_assign_op (void) -{ - bool retval = false; - - int c0 = text_yyinput (); - - switch (c0) - { - case '=': - { - int c1 = text_yyinput (); - xunput (c1); - if (c1 != '=') - retval = true; - } - break; - - case '+': - case '-': - case '*': - case '/': - case '\\': - case '&': - case '|': - { - int c1 = text_yyinput (); - xunput (c1); - if (c1 == '=') - retval = true; - } - break; - - case '.': - { - int c1 = text_yyinput (); - if (match_any (c1, "+-*/\\")) - { - int c2 = text_yyinput (); - xunput (c2); - if (c2 == '=') - retval = true; - } - xunput (c1); - } - break; - - case '>': - { - int c1 = text_yyinput (); - if (c1 == '>') - { - int c2 = text_yyinput (); - xunput (c2); - if (c2 == '=') - retval = true; - } - xunput (c1); - } - break; - - case '<': - { - int c1 = text_yyinput (); - if (c1 == '<') - { - int c2 = text_yyinput (); - xunput (c2); - if (c2 == '=') - retval = true; - } - xunput (c1); - } - break; - - default: - break; - } - - xunput (c0); - - return retval; -} - -bool -octave_lexer::next_token_is_index_op (void) -{ - int c = text_yyinput (); - xunput (c); - return c == '(' || c == '{'; -} - int -octave_lexer::handle_close_bracket (bool spc_gobbled, int bracket_type) +octave_lexer::handle_close_bracket (int bracket_type) { int retval = bracket_type; @@ -2967,51 +2437,9 @@ pop_start_state (); - quote_is_transpose = true; - convert_spaces_to_comma = true; - return retval; } -void -octave_lexer::maybe_unput_comma (int spc_gobbled) -{ - if (nesting_level.is_bracket () - || (nesting_level.is_brace () - && ! looking_at_object_index.front ())) - { - int bin_op = next_token_is_bin_op (spc_gobbled); - - int postfix_un_op = next_token_is_postfix_unary_op (spc_gobbled); - - int c1 = text_yyinput (); - int c2 = text_yyinput (); - - xunput (c2); - xunput (c1); - - int sep_op = next_token_is_sep_op (); - - int dot_op = (c1 == '.' - && (isalpha (c2) || isspace (c2) || c2 == '_')); - - if (postfix_un_op || bin_op || sep_op || dot_op) - return; - - int index_op = (c1 == '(' || c1 == '{'); - - // If there is no space before the indexing op, we don't insert - // a comma. - - if (index_op && ! spc_gobbled) - return; - - maybe_warn_separator_insert (','); - - xunput (','); - } -} - bool octave_lexer::next_token_can_follow_bin_op (void) { @@ -3279,8 +2707,6 @@ int octave_lexer::handle_superclass_identifier (void) { - eat_continuation (); - std::string pkg; char *yytxt = flex_yytext (); std::string meth = strip_trailing_whitespace (yytxt); @@ -3309,7 +2735,6 @@ pkg.empty () ? 0 : &(symbol_table::insert (pkg)), input_line_number, current_input_column)); - convert_spaces_to_comma = true; current_input_column += flex_yyleng (); return SUPERCLASSREF; @@ -3318,8 +2743,6 @@ int octave_lexer::handle_meta_identifier (void) { - eat_continuation (); - std::string pkg; char *yytxt = flex_yytext (); std::string cls = strip_trailing_whitespace (yytxt).substr (1); @@ -3343,7 +2766,6 @@ pkg.empty () ? 0 : &(symbol_table::insert (pkg)), input_line_number, current_input_column)); - convert_spaces_to_comma = true; current_input_column += flex_yyleng (); return METAQUERY; @@ -3371,15 +2793,9 @@ if (looking_at_indirect_ref) { - // do_comma_insert_check (); - - // maybe_unput_comma (spc_gobbled); - push_token (new token (STRUCT_ELT, tok, input_line_number, current_input_column)); - quote_is_transpose = true; - convert_spaces_to_comma = true; looking_for_object_index = true; current_input_column += flex_yyleng (); @@ -3415,8 +2831,6 @@ current_input_column)); current_input_column += flex_yyleng (); - quote_is_transpose = false; - convert_spaces_to_comma = true; looking_for_object_index = true; at_beginning_of_statement = false; @@ -3433,8 +2847,6 @@ if (kw_token >= 0) { current_input_column += flex_yyleng (); - quote_is_transpose = false; - convert_spaces_to_comma = true; looking_for_object_index = false; } @@ -3865,8 +3277,6 @@ push_token (new token (tok, input_line_number, current_input_column)); current_input_column += flex_yyleng (); - quote_is_transpose = qit; - convert_spaces_to_comma = convert; looking_for_object_index = false; at_beginning_of_statement = bos; @@ -3891,8 +3301,6 @@ push_token (tok_val); current_input_column += flex_yyleng (); - quote_is_transpose = false; - convert_spaces_to_comma = true; return count_token_internal (tok); }
--- a/libinterp/parse-tree/oct-parse.in.yy +++ b/libinterp/parse-tree/oct-parse.in.yy @@ -502,10 +502,7 @@ ; anon_fcn_handle : '@' param_list statement - { - curr_lexer->quote_is_transpose = false; - $$ = curr_parser.make_anon_fcn_handle ($2, $3); - } + { $$ = curr_parser.make_anon_fcn_handle ($2, $3); } ; primary_expr : identifier @@ -1033,10 +1030,7 @@ ; param_list : param_list_beg param_list1 param_list_end - { - curr_lexer->quote_is_transpose = false; - $$ = $2; - } + { $$ = $2; } | param_list_beg error { curr_parser.bison_error ("invalid parameter list");