Mercurial > hg > octave-nkf
annotate libinterp/parse-tree/lex.h @ 16110:7302f8a4df83
use pointer for global lexical_feedback structure
* lex.h, lex.ll (curr_lexer): Rename from lexer_flags.
Declare as pointer. Change all uses.
* lex.h (lexical_feedback): Make copy constructor and operator=
private.
* toplev.cc (main_loop): Protect existing and initialize new
curr_lexer.
* input.cc (get_debug_input): Likewise.
author | John W. Eaton <jwe@octave.org> |
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date | Tue, 26 Feb 2013 01:10:08 -0500 |
parents | 3b791008b88e |
children | 3ec4f6488569 |
rev | line source |
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1 | 1 /* |
2 | |
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maint: update copyright notices for 2012
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3 Copyright (C) 1993-2012 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 | |
8 under the terms of the GNU General Public License as published by the | |
7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
10 option) any later version. | |
1 | 11 |
12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
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 | |
383 | 23 #if !defined (octave_lex_h) |
24 #define octave_lex_h 1 | |
1 | 25 |
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26 #include <list> |
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27 #include <set> |
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28 #include <stack> |
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29 |
5775 | 30 // FIXME -- these input buffer things should be members of a |
1826 | 31 // parser input stream class. |
32 | |
1 | 33 typedef struct yy_buffer_state *YY_BUFFER_STATE; |
34 | |
35 // Associate a buffer with a new file to read. | |
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36 extern OCTINTERP_API YY_BUFFER_STATE create_buffer (FILE *f); |
1 | 37 |
38 // Report the current buffer. | |
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39 extern OCTINTERP_API YY_BUFFER_STATE current_buffer (void); |
1 | 40 |
41 // Connect to new buffer buffer. | |
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42 extern OCTINTERP_API void switch_to_buffer (YY_BUFFER_STATE buf); |
1 | 43 |
44 // Delete a buffer. | |
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45 extern OCTINTERP_API void delete_buffer (YY_BUFFER_STATE buf); |
1 | 46 |
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47 extern OCTINTERP_API void clear_all_buffers (void); |
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48 |
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49 extern OCTINTERP_API void cleanup_parser (void); |
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50 |
4867 | 51 // Is the given string a keyword? |
52 extern bool is_keyword (const std::string& s); | |
53 | |
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54 extern void prep_lexer_for_script_file (void); |
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55 extern void prep_lexer_for_function_file (void); |
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56 |
1826 | 57 // For communication between the lexer and parser. |
58 | |
3585 | 59 class |
60 lexical_feedback | |
1826 | 61 { |
62 public: | |
63 | |
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64 // Did eat_whitespace or eat_continuation eat a space or tab, or a |
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65 // newline, or both? |
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66 // |
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67 // Functions that return this type will return a logical OR of the |
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68 // following values: |
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69 // |
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70 // NO_WHITESPACE no spaces to eat |
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71 // SPACE_OR_TAB space or tab in input |
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72 // NEWLINE bare new line in input |
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73 |
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74 enum whitespace_type |
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75 { |
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76 NO_WHITESPACE = 1, |
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77 SPACE_OR_TAB = 2, |
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78 NEWLINE = 4 |
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79 }; |
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80 |
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81 |
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82 // Track nesting of square brackets, curly braces, and parentheses. |
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83 |
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84 class bbp_nesting_level |
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85 { |
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86 private: |
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87 |
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88 enum bracket_type |
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89 { |
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90 BRACKET = 1, |
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91 BRACE = 2, |
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92 PAREN = 3 |
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93 }; |
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94 |
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95 public: |
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96 |
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97 bbp_nesting_level (void) : context () { } |
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98 |
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99 bbp_nesting_level (const bbp_nesting_level& nl) : context (nl.context) { } |
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100 |
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101 bbp_nesting_level& operator = (const bbp_nesting_level& nl) |
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102 { |
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103 if (&nl != this) |
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104 context = nl.context; |
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105 |
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106 return *this; |
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107 } |
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108 |
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109 ~bbp_nesting_level (void) { } |
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110 |
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111 void bracket (void) { context.push (BRACKET); } |
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112 |
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113 bool is_bracket (void) |
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114 { |
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115 return ! context.empty () && context.top () == BRACKET; |
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116 } |
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117 |
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118 void brace (void) { context.push (BRACE); } |
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119 |
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120 bool is_brace (void) |
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121 { |
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122 return ! context.empty () && context.top () == BRACE; |
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123 } |
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124 |
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125 void paren (void) { context.push (PAREN); } |
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126 |
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127 bool is_paren (void) |
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128 { |
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129 return ! context.empty () && context.top () == PAREN; |
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130 } |
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131 |
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132 bool is_bracket_or_brace (void) |
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133 { |
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134 return (! context.empty () |
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135 && (context.top () == BRACKET || context.top () == BRACE)); |
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136 } |
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137 |
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138 bool none (void) { return context.empty (); } |
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139 |
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140 void remove (void) |
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141 { |
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142 if (! context.empty ()) |
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143 context.pop (); |
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144 } |
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145 |
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146 void clear (void) |
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147 { |
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148 while (! context.empty ()) |
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149 context.pop (); |
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150 } |
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151 |
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152 private: |
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153 |
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154 std::stack<int> context; |
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155 }; |
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156 |
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157 lexical_feedback (void) |
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158 : convert_spaces_to_comma (true), do_comma_insert (false), |
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159 at_beginning_of_statement (true), |
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160 looking_at_anon_fcn_args (false), looking_at_return_list (false), |
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161 looking_at_parameter_list (false), looking_at_decl_list (false), |
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162 looking_at_initializer_expression (false), |
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163 looking_at_matrix_or_assign_lhs (false), |
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164 looking_for_object_index (false), |
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165 looking_at_indirect_ref (false), parsing_class_method (false), |
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166 maybe_classdef_get_set_method (false), parsing_classdef (false), |
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167 quote_is_transpose (false), parser_end_of_input (false), |
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168 input_line_number (1), current_input_column (1), |
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169 bracketflag (0), braceflag (0), |
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170 looping (0), defining_func (0), looking_at_function_handle (0), |
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171 block_comment_nesting_level (0), |
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172 looking_at_object_index (), parsed_function_name (), |
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173 pending_local_variables (), nesting_level () |
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174 { |
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175 init (); |
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176 } |
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177 |
1826 | 178 ~lexical_feedback (void) { } |
179 | |
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180 void init (void) |
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181 { |
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182 // The closest paren, brace, or bracket nesting is not an object |
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183 // index. |
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184 looking_at_object_index.push_front (false); |
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185 } |
1826 | 186 |
2877 | 187 // TRUE means that we should convert spaces to a comma inside a |
2857 | 188 // matrix definition. |
189 bool convert_spaces_to_comma; | |
190 | |
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191 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
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192 bool do_comma_insert; |
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193 |
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194 // TRUE means we are at the beginning of a statement, where a |
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195 // command name is possible. |
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196 bool at_beginning_of_statement; |
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197 |
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198 // TRUE means we are parsing an anonymous function argument list. |
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199 bool looking_at_anon_fcn_args; |
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200 |
2877 | 201 // TRUE means we're parsing the return list for a function. |
2857 | 202 bool looking_at_return_list; |
203 | |
2877 | 204 // TRUE means we're parsing the parameter list for a function. |
2857 | 205 bool looking_at_parameter_list; |
206 | |
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207 // TRUE means we're parsing a declaration list (global or |
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208 // persistent). |
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209 bool looking_at_decl_list; |
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210 |
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211 // TRUE means we are looking at the initializer expression for a |
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212 // parameter list element. |
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213 bool looking_at_initializer_expression; |
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214 |
3189 | 215 // TRUE means we're parsing a matrix or the left hand side of |
216 // multi-value assignment statement. | |
217 bool looking_at_matrix_or_assign_lhs; | |
218 | |
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219 // Object index not possible until we've seen something. |
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220 bool looking_for_object_index; |
4234 | 221 |
2877 | 222 // TRUE means we're looking at an indirect reference to a |
2857 | 223 // structure element. |
224 bool looking_at_indirect_ref; | |
225 | |
9476 | 226 // TRUE means we are parsing a class method in function or classdef file. |
7336 | 227 bool parsing_class_method; |
228 | |
9476 | 229 // TRUE means we are parsing a class method declaration line in a |
230 // classdef file and can accept a property get or set method name. | |
231 // For example, "get.PropertyName" is recognized as a function name. | |
232 bool maybe_classdef_get_set_method; | |
233 | |
234 // TRUE means we are parsing a classdef file | |
235 bool parsing_classdef; | |
236 | |
1826 | 237 // Return transpose or start a string? |
2857 | 238 bool quote_is_transpose; |
1826 | 239 |
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240 // TRUE means that we have encountered EOF on the input stream. |
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241 bool parser_end_of_input; |
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242 |
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243 // The current input line number. |
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244 int input_line_number; |
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245 |
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246 // The column of the current token. |
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247 int current_input_column; |
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248 |
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249 // Square bracket level count. |
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250 int bracketflag; |
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251 |
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252 // Curly brace level count. |
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253 int braceflag; |
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254 |
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255 // TRUE means we're in the middle of defining a loop. |
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256 int looping; |
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257 |
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258 // Nonzero means we're in the middle of defining a function. |
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259 int defining_func; |
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260 |
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261 // Nonzero means we are parsing a function handle. |
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262 int looking_at_function_handle; |
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263 |
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264 // Nestng level for blcok comments. |
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265 int block_comment_nesting_level; |
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266 |
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267 // If the front of the list is TRUE, the closest paren, brace, or |
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268 // bracket nesting is an index for an object. |
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269 std::list<bool> looking_at_object_index; |
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270 |
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271 // If the top of the stack is TRUE, then we've already seen the name |
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272 // of the current function. Should only matter if |
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273 // current_function_level > 0 |
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274 std::stack<bool> parsed_function_name; |
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275 |
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276 // Set of identifiers that might be local variable names. |
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277 std::set<std::string> pending_local_variables; |
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278 |
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279 // Is the closest nesting level a square bracket, squiggly brace or |
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280 // a paren? |
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281 bbp_nesting_level nesting_level; |
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282 |
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283 private: |
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284 |
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285 // No copying! |
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286 |
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287 lexical_feedback (const lexical_feedback&); |
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288 |
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289 lexical_feedback& operator = (const lexical_feedback&); |
1826 | 290 }; |
291 | |
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292 class |
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293 stream_reader |
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294 { |
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295 public: |
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296 virtual int getc (void) = 0; |
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297 virtual int ungetc (int c) = 0; |
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298 |
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299 protected: |
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300 stream_reader (void) { } |
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301 ~stream_reader (void) { } |
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302 |
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303 private: |
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304 |
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305 // No copying! |
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306 stream_reader (const stream_reader&); |
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307 stream_reader& operator = (const stream_reader&); |
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308 }; |
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309 |
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310 extern std::string |
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311 grab_comment_block (stream_reader& reader, bool at_bol, bool& eof); |
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312 |
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313 // The current state of the lexer. |
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314 extern lexical_feedback *curr_lexer; |
440 | 315 |
1 | 316 #endif |