Mercurial > octave
annotate libinterp/parse-tree/lex.h @ 23693:b9378eff6d13
move symbol_table class inside octave namespace
author | John W. Eaton <jwe@octave.org> |
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date | Sun, 25 Jun 2017 09:50:51 -0400 |
parents | 2d4a7ae1f6cd |
children | 85f1d31956c0 |
rev | line source |
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1 | 1 /* |
2 | |
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3 Copyright (C) 1993-2017 John W. Eaton |
1 | 4 |
5 This file is part of Octave. | |
6 | |
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 |
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9 the Free Software Foundation; either version 3 of the License, or |
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10 (at your option) any later version. |
1 | 11 |
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12 Octave is distributed in the hope that it will be useful, but |
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13 WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
1 | 16 |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
19 <http://www.gnu.org/licenses/>. | |
1 | 20 |
21 */ | |
22 | |
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23 #if ! defined (octave_lex_h) |
383 | 24 #define octave_lex_h 1 |
1 | 25 |
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26 #include "octave-config.h" |
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27 |
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28 #include <deque> |
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29 #include <limits> |
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30 #include <list> |
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31 #include <set> |
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32 #include <stack> |
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33 |
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34 #include "comment-list.h" |
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35 #include "input.h" |
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36 #include "token.h" |
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37 |
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38 namespace octave |
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39 { |
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40 class interpreter; |
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41 class symbol_table; |
1826 | 42 |
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43 // Is the given string a keyword? |
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44 extern bool is_keyword (const std::string& s); |
1826 | 45 |
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46 // For communication between the lexer and parser. |
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47 |
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48 class |
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49 lexical_feedback |
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50 { |
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51 public: |
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52 |
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53 // Track symbol table information when parsing functions. |
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54 |
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55 class symbol_table_context |
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56 { |
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57 public: |
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58 |
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59 symbol_table_context (void) |
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60 : frame_stack () { } |
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61 |
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62 ~symbol_table_context (void) { clear (); } |
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63 |
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64 void clear (void); |
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65 |
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66 bool empty (void) const { return frame_stack.empty (); } |
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67 |
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68 size_t size (void) const { return frame_stack.size (); } |
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69 |
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70 void pop (void); |
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71 |
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72 void push (symbol_table::scope *scope) |
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73 { |
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74 frame_stack.push_front (scope); |
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75 } |
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76 |
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77 symbol_table::scope *curr_scope (void) const; |
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78 symbol_table::scope *parent_scope (void) const; |
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79 |
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80 private: |
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81 |
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82 std::deque<symbol_table::scope*> frame_stack; |
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83 }; |
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84 |
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85 // Track nesting of square brackets, curly braces, and parentheses. |
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86 |
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87 class bbp_nesting_level |
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88 { |
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89 private: |
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90 |
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91 enum bracket_type |
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92 { |
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93 BRACKET = 1, |
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94 BRACE = 2, |
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95 PAREN = 3, |
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96 ANON_FCN_BODY = 4 |
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97 }; |
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98 |
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99 public: |
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100 |
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101 bbp_nesting_level (void) : context () { } |
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102 |
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103 bbp_nesting_level (const bbp_nesting_level& nl) : context (nl.context) { } |
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104 |
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105 bbp_nesting_level& operator = (const bbp_nesting_level& nl) |
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106 { |
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107 if (&nl != this) |
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108 context = nl.context; |
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109 |
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110 return *this; |
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111 } |
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112 |
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113 ~bbp_nesting_level (void) = default; |
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114 |
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115 void reset (void) |
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116 { |
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117 while (! context.empty ()) |
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118 context.pop (); |
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119 } |
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120 |
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121 void bracket (void) { context.push (BRACKET); } |
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122 |
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123 bool is_bracket (void) |
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124 { |
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125 return ! context.empty () && context.top () == BRACKET; |
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126 } |
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127 |
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128 void brace (void) { context.push (BRACE); } |
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129 |
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130 bool is_brace (void) |
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131 { |
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132 return ! context.empty () && context.top () == BRACE; |
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133 } |
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134 |
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135 void paren (void) { context.push (PAREN); } |
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136 |
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137 bool is_paren (void) |
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138 { |
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139 return ! context.empty () && context.top () == PAREN; |
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140 } |
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141 |
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142 void anon_fcn_body (void) { context.push (ANON_FCN_BODY); } |
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143 |
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144 bool is_anon_fcn_body (void) |
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145 { |
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146 return ! context.empty () && context.top () == ANON_FCN_BODY; |
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147 } |
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148 |
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149 bool is_bracket_or_brace (void) |
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150 { |
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151 return (! context.empty () |
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152 && (context.top () == BRACKET || context.top () == BRACE)); |
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153 } |
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154 |
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155 bool none (void) { return context.empty (); } |
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156 |
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157 void remove (void) |
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158 { |
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159 if (! context.empty ()) |
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160 context.pop (); |
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161 } |
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162 |
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163 void clear (void) |
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164 { |
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165 while (! context.empty ()) |
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166 context.pop (); |
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167 } |
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168 |
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169 private: |
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170 |
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171 std::stack<int> context; |
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172 }; |
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173 |
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174 class token_cache |
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175 { |
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176 public: |
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177 |
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178 // Store an "unlimited" number of tokens. |
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179 |
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180 // Tokens are allocated with new. Delete them when they are |
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181 // removed from the cache. |
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182 // |
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183 // One of the reasons for using this class instead of std::deque |
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184 // directly is that we can ensure that memory is cleaned up |
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185 // properly. It's more tedious to do that with deque since the |
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186 // deque destructor and clear method don't call delete on the |
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187 // elements that it stores. Another reason is that it makes it |
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188 // easier to change the implementation later if needed. |
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189 |
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190 token_cache (void) : buffer () { } |
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191 |
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192 // No copying! |
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193 |
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194 token_cache (const token_cache&) = delete; |
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195 |
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196 token_cache& operator = (const token_cache&) = delete; |
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197 |
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198 ~token_cache (void) { clear (); } |
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199 |
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200 void push (token *tok) |
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201 { |
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202 buffer.push_front (tok); |
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203 } |
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204 |
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205 void pop (void) |
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206 { |
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207 if (! empty ()) |
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208 { |
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209 delete buffer.back (); |
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210 buffer.pop_back (); |
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211 } |
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212 } |
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213 |
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214 // Direct access. |
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215 token * at (size_t n) |
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216 { |
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217 return empty () ? 0 : buffer.at (n); |
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218 } |
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219 |
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220 const token * at (size_t n) const |
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221 { |
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222 return empty () ? 0 : buffer.at (n); |
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223 } |
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224 |
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225 // Most recently pushed. |
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226 token * front (void) |
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227 { |
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228 return empty () ? 0 : buffer.front (); |
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229 } |
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230 |
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231 const token * front (void) const |
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232 { |
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233 return empty () ? 0 : buffer.front (); |
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234 } |
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235 |
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236 token * back (void) |
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237 { |
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238 return empty () ? 0 : buffer.back (); |
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239 } |
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240 |
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241 const token * back (void) const |
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242 { |
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243 return empty () ? 0 : buffer.back (); |
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244 } |
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245 |
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246 // Number of elements currently in the buffer. |
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247 size_t size (void) const { return buffer.size (); } |
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248 |
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249 bool empty (void) const { return buffer.empty (); } |
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250 |
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251 void clear (void) |
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252 { |
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253 while (! empty ()) |
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254 pop (); |
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255 } |
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256 |
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257 private: |
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258 |
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259 std::deque<token *> buffer; |
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260 }; |
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261 |
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262 lexical_feedback (void) |
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263 : end_of_input (false), at_beginning_of_statement (true), |
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264 looking_at_anon_fcn_args (false), looking_at_return_list (false), |
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265 looking_at_parameter_list (false), looking_at_decl_list (false), |
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266 looking_at_initializer_expression (false), |
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267 looking_at_matrix_or_assign_lhs (false), |
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268 looking_for_object_index (false), |
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269 looking_at_indirect_ref (false), parsing_class_method (false), |
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270 parsing_classdef (false), maybe_classdef_get_set_method (false), |
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271 parsing_classdef_get_method (false), |
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272 parsing_classdef_set_method (false), |
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273 quote_is_transpose (false), force_script (false), |
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274 reading_fcn_file (false), reading_script_file (false), |
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275 reading_classdef_file (false), |
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276 input_line_number (1), current_input_column (1), |
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277 bracketflag (0), braceflag (0), |
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278 looping (0), defining_func (0), looking_at_function_handle (0), |
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279 block_comment_nesting_level (0), command_arg_paren_count (0), |
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280 token_count (0), current_input_line (), comment_text (), |
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281 help_text (), string_text (), string_line (0), string_column (0), |
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282 fcn_file_name (), fcn_file_full_name (), dir_name (), |
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283 package_name (), looking_at_object_index (), parsed_function_name (), |
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284 pending_local_variables (), symtab_context (), nesting_level (), |
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285 tokens () |
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286 { |
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287 init (); |
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288 } |
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289 |
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290 // No copying! |
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291 |
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292 lexical_feedback (const lexical_feedback&) = delete; |
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293 |
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294 lexical_feedback& operator = (const lexical_feedback&) = delete; |
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295 |
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296 ~lexical_feedback (void); |
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297 |
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298 void init (void); |
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299 |
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300 void reset (void); |
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301 |
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302 int previous_token_value (void) const; |
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303 |
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304 bool previous_token_value_is (int tok_val) const; |
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305 |
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306 void mark_previous_token_trailing_space (void); |
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307 |
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308 bool space_follows_previous_token (void) const; |
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309 |
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310 bool previous_token_is_binop (void) const; |
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311 |
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312 bool previous_token_is_keyword (void) const; |
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313 |
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314 bool previous_token_may_be_command (void) const; |
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315 |
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316 void maybe_mark_previous_token_as_variable (void); |
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317 |
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318 void mark_as_variable (const std::string& nm); |
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319 void mark_as_variables (const std::list<std::string>& lst); |
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320 |
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321 // true means that we have encountered eof on the input stream. |
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322 bool end_of_input; |
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323 |
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324 // true means we are at the beginning of a statement, where a |
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325 // command name is possible. |
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326 bool at_beginning_of_statement; |
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327 |
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328 // true means we are parsing an anonymous function argument list. |
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329 bool looking_at_anon_fcn_args; |
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330 |
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331 // true means we're parsing the return list for a function. |
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332 bool looking_at_return_list; |
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333 |
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334 // true means we're parsing the parameter list for a function. |
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335 bool looking_at_parameter_list; |
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336 |
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337 // true means we're parsing a declaration list (global or |
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338 // persistent). |
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339 bool looking_at_decl_list; |
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340 |
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341 // true means we are looking at the initializer expression for a |
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342 // parameter list element. |
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343 bool looking_at_initializer_expression; |
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344 |
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345 // true means we're parsing a matrix or the left hand side of |
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346 // multi-value assignment statement. |
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347 bool looking_at_matrix_or_assign_lhs; |
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348 |
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349 // object index not possible until we've seen something. |
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350 bool looking_for_object_index; |
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351 |
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352 // true means we're looking at an indirect reference to a |
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353 // structure element. |
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354 bool looking_at_indirect_ref; |
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355 |
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356 // true means we are parsing a class method in function or classdef file. |
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357 bool parsing_class_method; |
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358 |
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359 // true means we are parsing a classdef file |
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360 bool parsing_classdef; |
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361 |
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362 // true means we are parsing a class method declaration line in a |
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363 // classdef file and can accept a property get or set method name. |
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364 // for example, "get.propertyname" is recognized as a function name. |
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365 bool maybe_classdef_get_set_method; |
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366 |
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367 // TRUE means we are parsing a classdef get.method. |
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368 bool parsing_classdef_get_method; |
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369 |
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370 // TRUE means we are parsing a classdef set.method. |
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371 bool parsing_classdef_set_method; |
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372 |
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373 // return transpose or start a string? |
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374 bool quote_is_transpose; |
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375 |
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376 // TRUE means treat the current file as a script even if the first |
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377 // token is "function" or "classdef". |
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378 bool force_script; |
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379 |
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380 // TRUE means we're parsing a function file. |
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381 bool reading_fcn_file; |
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382 |
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383 // TRUE means we're parsing a script file. |
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384 bool reading_script_file; |
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385 |
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386 // TRUE means we're parsing a classdef file. |
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387 bool reading_classdef_file; |
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388 |
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389 // the current input line number. |
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390 int input_line_number; |
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391 |
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392 // the column of the current token. |
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393 int current_input_column; |
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394 |
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395 // square bracket level count. |
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396 int bracketflag; |
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397 |
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398 // curly brace level count. |
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399 int braceflag; |
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400 |
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401 // true means we're in the middle of defining a loop. |
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402 int looping; |
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403 |
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404 // nonzero means we're in the middle of defining a function. |
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405 int defining_func; |
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406 |
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407 // nonzero means we are parsing a function handle. |
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408 int looking_at_function_handle; |
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409 |
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410 // nestng level for blcok comments. |
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411 int block_comment_nesting_level; |
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412 |
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413 // Parenthesis count for command argument parsing. |
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414 int command_arg_paren_count; |
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415 |
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416 // Count of tokens recognized by this lexer since initialized or |
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417 // since the last reset. |
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418 size_t token_count; |
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419 |
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420 // The current line of input. |
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421 std::string current_input_line; |
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422 |
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423 // The current comment text. |
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424 std::string comment_text; |
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425 |
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426 // The current help text. |
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427 std::string help_text; |
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428 |
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429 // The current character string text. |
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430 std::string string_text; |
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431 |
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432 // The position of the beginning of the current character string. |
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433 int string_line; |
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434 int string_column; |
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435 |
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436 // Simple name of function file we are reading. |
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437 std::string fcn_file_name; |
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438 |
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439 // Full name of file we are reading. |
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440 std::string fcn_file_full_name; |
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441 |
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442 // Directory name where this file was found. May be relative. |
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443 std::string dir_name; |
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444 |
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445 // Name of +package containing this file, if any. |
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446 std::string package_name; |
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447 |
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448 // if the front of the list is true, the closest paren, brace, or |
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449 // bracket nesting is an index for an object. |
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450 std::list<bool> looking_at_object_index; |
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451 |
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452 // if the top of the stack is true, then we've already seen the name |
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453 // of the current function. should only matter if |
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454 // current_function_level > 0 |
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455 std::stack<bool> parsed_function_name; |
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456 |
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457 // set of identifiers that might be local variable names. |
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458 std::set<std::string> pending_local_variables; |
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459 |
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460 // Track current symbol table scope and context. |
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461 symbol_table_context symtab_context; |
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462 |
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463 // is the closest nesting level a square bracket, squiggly brace, |
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464 // a paren, or an anonymous function body? |
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465 bbp_nesting_level nesting_level; |
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466 |
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467 // Tokens generated by the lexer. |
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468 token_cache tokens; |
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469 }; |
17787
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Use GNU style coding conventions for code in libinterp/
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470 |
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471 // base_lexer inherits from lexical_feedback because we will |
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472 // eventually have several different constructors and it is easier to |
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473 // intialize if everything is grouped in a parent class rather than |
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474 // listing all the members in the base_lexer class. |
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475 |
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476 class |
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477 base_lexer : public lexical_feedback |
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478 { |
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479 public: |
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480 |
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481 // Handle buffering of input for lexer. |
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482 |
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483 class input_buffer |
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484 { |
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485 public: |
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486 |
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487 input_buffer (void) |
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488 : buffer (), pos (0), chars_left (0), eof (false) |
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489 { } |
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490 |
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491 void fill (const std::string& input, bool eof_arg); |
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492 |
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493 // Copy at most max_size characters to buf. |
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494 int copy_chunk (char *buf, size_t max_size); |
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495 |
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496 bool empty (void) const { return chars_left == 0; } |
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497 |
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498 bool at_eof (void) const { return eof; } |
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499 |
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500 private: |
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501 |
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502 std::string buffer; |
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503 const char *pos; |
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504 size_t chars_left; |
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505 bool eof; |
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506 }; |
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507 |
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508 // Collect comment text. |
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509 |
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510 class |
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511 comment_buffer |
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512 { |
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513 public: |
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514 |
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515 comment_buffer (void) : comment_list (0) { } |
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516 |
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517 ~comment_buffer (void) { delete comment_list; } |
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518 |
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519 void append (const std::string& s, octave_comment_elt::comment_type t) |
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520 { |
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521 if (! comment_list) |
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522 comment_list = new octave_comment_list (); |
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523 |
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524 comment_list->append (s, t); |
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525 } |
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526 |
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527 // Caller is expected to delete the returned value. |
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528 |
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529 octave_comment_list * get_comment (void) |
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530 { |
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531 octave_comment_list *retval = comment_list; |
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532 |
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533 comment_list = 0; |
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534 |
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535 return retval; |
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536 } |
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537 |
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538 void reset (void) |
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539 { |
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540 delete comment_list; |
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541 |
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542 comment_list = 0; |
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543 } |
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544 |
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545 private: |
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546 |
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547 octave_comment_list *comment_list; |
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548 }; |
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549 |
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550 base_lexer (interpreter *interp = nullptr) |
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551 : lexical_feedback (), scanner (0), input_buf (), comment_buf (), |
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552 m_interpreter (interp) |
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553 { |
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554 init (); |
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555 } |
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556 |
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557 // No copying! |
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558 |
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559 base_lexer (const base_lexer&) = delete; |
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560 |
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561 base_lexer& operator = (const base_lexer&) = delete; |
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562 |
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563 virtual ~base_lexer (void); |
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564 |
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565 void init (void); |
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566 |
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567 virtual bool is_push_lexer (void) const { return false; } |
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568 |
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569 virtual void reset (void); |
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570 |
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571 void prep_for_file (void); |
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572 |
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573 void begin_string (int state); |
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574 |
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575 virtual int fill_flex_buffer (char *buf, unsigned int max_size) = 0; |
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576 |
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577 bool at_end_of_buffer (void) const { return input_buf.empty (); } |
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578 |
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579 bool at_end_of_file (void) const { return input_buf.at_eof (); } |
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580 |
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581 int handle_end_of_input (void); |
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582 |
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583 char * flex_yytext (void); |
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584 |
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585 int flex_yyleng (void); |
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586 |
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587 int text_yyinput (void); |
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588 |
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589 void xunput (char c, char *buf); |
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590 |
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591 void xunput (char c); |
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592 |
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593 bool looking_at_space (void); |
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594 |
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595 bool inside_any_object_index (void); |
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596 |
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597 bool is_variable (const std::string& name, symbol_table::scope *scope); |
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598 |
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599 int is_keyword_token (const std::string& s); |
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600 |
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601 bool fq_identifier_contains_keyword (const std::string& s); |
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602 |
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603 bool whitespace_is_significant (void); |
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604 |
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605 void handle_number (void); |
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606 |
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607 void handle_continuation (void); |
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608 |
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609 void finish_comment (octave_comment_elt::comment_type typ); |
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610 |
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611 octave_comment_list * get_comment (void) { return comment_buf.get_comment (); } |
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612 |
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613 int handle_close_bracket (int bracket_type); |
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614 |
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615 bool looks_like_command_arg (void); |
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616 |
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617 int handle_superclass_identifier (void); |
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618 |
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619 int handle_meta_identifier (void); |
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620 |
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621 int handle_fq_identifier (void); |
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622 |
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623 int handle_identifier (void); |
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624 |
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625 void maybe_warn_separator_insert (char sep); |
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626 |
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627 void warn_single_quote_string (void); |
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628 |
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629 void warn_language_extension (const std::string& msg); |
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630 |
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631 void maybe_warn_language_extension_comment (char c); |
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632 |
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633 void warn_language_extension_continuation (void); |
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634 |
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635 void warn_language_extension_operator (const std::string& op); |
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636 |
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637 void push_token (token *); |
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638 |
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639 token * current_token (void); |
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640 |
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641 void display_token (int tok); |
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642 |
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643 void fatal_error (const char *msg); |
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644 |
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645 void lexer_debug (const char *pattern); |
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646 |
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647 // Internal state of the flex-generated lexer. |
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648 void *scanner; |
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649 |
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650 // Object that reads and buffers input. |
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651 input_buffer input_buf; |
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652 |
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653 // Object that collects comment text. |
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654 comment_buffer comment_buf; |
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655 |
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656 // Interpreter that contains us, if any. |
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657 interpreter *m_interpreter; |
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658 |
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659 virtual void increment_promptflag (void) = 0; |
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660 |
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661 virtual void decrement_promptflag (void) = 0; |
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662 |
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663 virtual int promptflag (void) const = 0; |
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664 |
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665 virtual int promptflag (int) = 0; |
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666 |
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667 virtual std::string input_source (void) const { return "unknown"; } |
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668 |
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669 virtual bool input_from_terminal (void) const { return false; } |
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670 |
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671 virtual bool input_from_file (void) const { return false; } |
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672 |
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673 virtual bool input_from_eval_string (void) const { return false; } |
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674 |
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675 void push_start_state (int state); |
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676 |
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677 void pop_start_state (void); |
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678 |
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679 void clear_start_state (void); |
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680 |
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681 int start_state (void) const { return start_state_stack.top (); } |
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682 |
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683 void display_start_state (void) const; |
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684 |
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685 int handle_op (const char *pattern, int tok, bool bos = false); |
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686 |
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687 int handle_language_extension_op (const char *pattern, int tok, |
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688 bool bos = false); |
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689 |
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690 bool maybe_unput_comma_before_unary_op (int tok); |
16183
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691 |
22196
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692 int handle_unary_op (int tok, bool bos = false); |
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693 |
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694 int handle_language_extension_unary_op (int tok, bool bos = false); |
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695 |
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696 int handle_assign_op (const char *pattern, int tok); |
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697 |
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698 int handle_language_extension_assign_op (const char *pattern, int tok); |
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699 |
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700 int handle_op_internal (int tok, bool bos, bool compat); |
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701 |
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702 int handle_token (const std::string& name, int tok); |
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703 |
23457
21baad6b35c4
maint: Use C++11 nullptr rather than 0 or NULL when possible.
Rik <rik@octave.org>
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|
704 int handle_token (int tok, token *tok_val = nullptr); |
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705 |
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706 int count_token (int tok); |
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707 |
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708 int count_token_internal (int tok); |
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|
709 |
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710 int show_token (int tok); |
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711 |
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712 void enable_fq_identifier (void); |
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713 |
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714 protected: |
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715 |
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716 std::stack<int> start_state_stack; |
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717 }; |
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718 |
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|
719 class |
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720 lexer : public base_lexer |
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721 { |
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722 public: |
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723 |
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724 lexer (interpreter *interp = nullptr) |
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725 : base_lexer (interp), reader (this) |
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726 { } |
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727 |
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728 lexer (FILE *file, interpreter *interp = nullptr) |
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729 : base_lexer (interp), reader (file, this) |
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730 { } |
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731 |
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732 lexer (const std::string& eval_string, interpreter *interp = nullptr) |
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733 : base_lexer (interp), reader (eval_string, this) |
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734 { } |
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735 |
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736 // No copying! |
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737 |
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738 lexer (const lexer&) = delete; |
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739 |
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740 lexer& operator = (const lexer&) = delete; |
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741 |
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742 void reset (void) |
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743 { |
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744 reader.reset (); |
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745 |
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746 base_lexer::reset (); |
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747 } |
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748 |
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749 void increment_promptflag (void) { reader.increment_promptflag (); } |
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750 |
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751 void decrement_promptflag (void) { reader.decrement_promptflag (); } |
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752 |
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753 int promptflag (void) const { return reader.promptflag (); } |
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754 |
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755 int promptflag (int n) { return reader.promptflag (n); } |
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756 |
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757 std::string input_source (void) const |
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758 { |
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759 return reader.input_source (); |
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760 } |
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761 |
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762 bool input_from_terminal (void) const |
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763 { |
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764 return reader.input_from_terminal (); |
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765 } |
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766 |
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767 bool input_from_file (void) const |
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768 { |
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|
769 return reader.input_from_file (); |
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770 } |
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|
771 |
22196
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772 bool input_from_eval_string (void) const |
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|
773 { |
23061
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changeset
|
774 return reader.input_from_eval_string (); |
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775 } |
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|
776 |
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777 int fill_flex_buffer (char *buf, unsigned int max_size); |
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|
778 |
23061
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|
779 input_reader reader; |
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|
780 }; |
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diff
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|
781 |
22196
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|
782 class |
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783 push_lexer : public base_lexer |
16195
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diff
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|
784 { |
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|
785 public: |
16113
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|
786 |
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|
787 push_lexer (interpreter *interp = nullptr) |
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788 : base_lexer (interp), pflag (1) |
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789 { |
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|
790 append_input ("", false); |
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|
791 } |
16253
a89cf57ba3a5
partial cleanup of continuation handling in lexer
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16231
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changeset
|
792 |
23532
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793 push_lexer (const std::string& input, interpreter *interp = nullptr) |
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794 : base_lexer (interp), pflag (1) |
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795 { |
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796 append_input (input, false); |
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|
797 } |
16113
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changeset
|
798 |
23532
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|
799 push_lexer (bool eof, interpreter *interp = nullptr) |
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800 : base_lexer (interp), pflag (1) |
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801 { |
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|
802 append_input ("", eof); |
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|
803 } |
16209
e7ff32e7cf82
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16207
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changeset
|
804 |
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|
805 push_lexer (const std::string& input, bool eof, |
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|
806 interpreter *interp = nullptr) |
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|
807 : base_lexer (interp), pflag (1) |
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|
808 { |
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|
809 append_input (input, eof); |
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|
810 } |
16224
4a848eb52de2
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parents:
16209
diff
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|
811 |
22869
f75d289645ec
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|
812 // No copying! |
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|
813 |
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|
814 push_lexer (const push_lexer&) = delete; |
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|
815 |
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|
816 push_lexer& operator = (const push_lexer&) = delete; |
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817 |
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818 bool is_push_lexer (void) const { return true; } |
16263
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|
819 |
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820 void reset (void) |
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821 { |
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|
822 promptflag (1); |
16229
7b7b1e4968e8
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|
823 |
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824 base_lexer::reset (); |
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825 } |
16293
57e87ddfee14
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16292
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|
826 |
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827 void append_input (const std::string& input, bool eof) |
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828 { |
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829 input_buf.fill (input, eof); |
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830 } |
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831 |
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832 void increment_promptflag (void) { pflag++; } |
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833 |
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834 void decrement_promptflag (void) { pflag--; } |
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835 |
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836 int promptflag (void) const { return pflag; } |
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837 |
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838 int promptflag (int n) |
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839 { |
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840 int retval = pflag; |
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841 pflag = n; |
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842 return retval; |
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843 } |
1826 | 844 |
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845 std::string input_source (void) const { return "push buffer"; } |
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846 |
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847 int fill_flex_buffer (char *buf, unsigned int max_size); |
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848 |
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849 protected: |
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850 |
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851 int pflag; |
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852 }; |
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853 } |
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854 |
1 | 855 #endif |