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>
date Tue, 26 Feb 2013 01:10:08 -0500
parents 3b791008b88e
children 3ec4f6488569
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1 /*
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2
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72c96de7a403 maint: update copyright notices for 2012
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3 Copyright (C) 1993-2012 John W. Eaton
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4
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5 This file is part of Octave.
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6
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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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_lex_h)
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24 #define octave_lex_h 1
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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
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30 // FIXME -- these input buffer things should be members of a
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31 // parser input stream class.
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32
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33 typedef struct yy_buffer_state *YY_BUFFER_STATE;
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34
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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);
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37
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38 // Report the current buffer.
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39 extern OCTINTERP_API YY_BUFFER_STATE current_buffer (void);
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41 // Connect to new buffer buffer.
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42 extern OCTINTERP_API void switch_to_buffer (YY_BUFFER_STATE buf);
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43
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44 // Delete a buffer.
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45 extern OCTINTERP_API void delete_buffer (YY_BUFFER_STATE buf);
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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
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51 // Is the given string a keyword?
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52 extern bool is_keyword (const std::string& s);
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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
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57 // For communication between the lexer and parser.
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58
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59 class
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60 lexical_feedback
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61 {
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62 public:
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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
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178 ~lexical_feedback (void) { }
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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 }
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186
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187 // TRUE means that we should convert spaces to a comma inside a
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188 // matrix definition.
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189 bool convert_spaces_to_comma;
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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
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201 // TRUE means we're parsing the return list for a function.
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202 bool looking_at_return_list;
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203
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204 // TRUE means we're parsing the parameter list for a function.
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205 bool looking_at_parameter_list;
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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
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215 // TRUE means we're parsing a matrix or the left hand side of
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216 // multi-value assignment statement.
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217 bool looking_at_matrix_or_assign_lhs;
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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;
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221
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222 // TRUE means we're looking at an indirect reference to a
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223 // structure element.
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224 bool looking_at_indirect_ref;
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225
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226 // TRUE means we are parsing a class method in function or classdef file.
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227 bool parsing_class_method;
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228
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229 // TRUE means we are parsing a class method declaration line in a
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230 // classdef file and can accept a property get or set method name.
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231 // For example, "get.PropertyName" is recognized as a function name.
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232 bool maybe_classdef_get_set_method;
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233
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234 // TRUE means we are parsing a classdef file
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235 bool parsing_classdef;
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236
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237 // Return transpose or start a string?
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238 bool quote_is_transpose;
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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&);
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290 };
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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;
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315
1
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316 #endif