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annotate libinterp/parse-tree/parse-private.h @ 16263:9acb86e6ac90

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4/10 commits reworking the lexer
author John W. Eaton <jwe@octave.org>
date Mon, 11 Mar 2013 14:28:11 -0400
parents 2fc554ffbc28
children
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1 /*
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2
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3 Copyright (C) 2012 John W. Eaton
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_parse_private_h)
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24 #define octave_parse_private_h 1
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25
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26 #include <stack>
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27
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28 #include "symtab.h"
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29
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30 // Keep track of symbol table information when parsing functions.
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31 class symtab_context
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32 {
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33 private:
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34
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35 class frame
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36 {
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37 public:
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38 frame (symbol_table::scope_id s, symbol_table::scope_id c)
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39 : m_scope (s), m_context (c) { }
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40
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41 frame (const frame& f) : m_scope (f.m_scope), m_context (f.m_context) { }
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42
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43 frame& operator = (const frame& f)
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44 {
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45 if (&f != this)
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46 {
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47 m_scope = f.m_scope;
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48 m_context = f.m_context;
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49 }
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50
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51 return *this;
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52 }
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53
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54 ~frame (void) { }
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55
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56 symbol_table::scope_id scope (void) const { return m_scope; }
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57 symbol_table::scope_id context (void) const { return m_context; }
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58
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59 private:
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60
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61 symbol_table::scope_id m_scope;
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62 symbol_table::scope_id m_context;
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63 };
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64
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65 std::stack<frame> frame_stack;
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66
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67 public:
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68 symtab_context (void) : frame_stack () { }
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69
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70 void clear (void)
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71 {
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72 while (! frame_stack.empty ())
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73 frame_stack.pop ();
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74 }
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75
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76 bool empty (void) const { return frame_stack.empty (); }
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77
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78 void pop (void)
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79 {
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80 frame tmp = frame_stack.top ();
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81
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82 symbol_table::set_scope_and_context (tmp.scope (), tmp.context ());
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83
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84 frame_stack.pop ();
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85 }
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86
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87 void push (void)
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88 {
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89 frame_stack.push (frame (symbol_table::current_scope (),
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90 symbol_table::current_context ()));
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91 }
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92 };
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93
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94 extern symtab_context parser_symtab_context;
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95
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96 #endif