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annotate libinterp/parse-tree/lex.h @ 16209:e7ff32e7cf82

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move global promptflag variable to octave_reader class * input.h, input.cc (promptflag): Declare as member of octave_base_reader and rename to pflag. (octave_base_reader::reset, octave_base_reader::promptflag, octave_base_reader::increment_promptflag, octave_reader::decrement_promptflag, octave_reader::promptflag, octave_reader::increment_promptflag, octave_reader::decrement_promptflag): New functions. * lex.ll (octave_lexer::decrement_promptflag, octave_lexer::promptflag, octave_lexer::increment_promptflag, octave_lexer::decrement_promptflag): New functions. Use them instead of global promptflag variable. (octave_lexer::reset): Call input_reader.reset. * oct-parse.in.yy (input): Don't reset promptflag here.
author John W. Eaton <jwe@octave.org>
date Wed, 06 Mar 2013 20:20:35 -0500
parents 0467d68ca891
children d2b268936783 4a848eb52de2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.
1
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11
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
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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 #include "input.h"
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31
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32 extern OCTINTERP_API void cleanup_parser (void);
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33
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34 // Is the given string a keyword?
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35 extern bool is_keyword (const std::string& s);
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36
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37 class
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38 stream_reader
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39 {
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40 public:
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41 virtual int getc (void) = 0;
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42 virtual int ungetc (int c) = 0;
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43
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44 protected:
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45 stream_reader (void) { }
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46 ~stream_reader (void) { }
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47
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48 private:
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49
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50 // No copying!
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51 stream_reader (const stream_reader&);
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52 stream_reader& operator = (const stream_reader&);
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53 };
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54
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55 // Forward decl for octave_lexer::token_stack.
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56 class token;
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57
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58 // For communication between the lexer and parser.
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59
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60 class
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61 lexical_feedback
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62 {
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63 public:
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64
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65 // Did eat_whitespace or eat_continuation eat a space or tab, or a
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66 // newline, or both?
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67 //
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68 // Functions that return this type will return a logical OR of the
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69 // following values:
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70 //
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71 // NO_WHITESPACE no spaces to eat
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72 // SPACE_OR_TAB space or tab in input
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73 // NEWLINE bare new line in input
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74
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75 enum whitespace_type
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76 {
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77 NO_WHITESPACE = 1,
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78 SPACE_OR_TAB = 2,
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79 NEWLINE = 4
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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 reset (void)
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112 {
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113 while (! context.empty ())
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114 context.pop ();
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115 }
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116
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117 void bracket (void) { context.push (BRACKET); }
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118
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119 bool is_bracket (void)
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120 {
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121 return ! context.empty () && context.top () == BRACKET;
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122 }
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123
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124 void brace (void) { context.push (BRACE); }
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125
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126 bool is_brace (void)
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127 {
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128 return ! context.empty () && context.top () == BRACE;
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129 }
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130
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131 void paren (void) { context.push (PAREN); }
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132
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133 bool is_paren (void)
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134 {
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135 return ! context.empty () && context.top () == PAREN;
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136 }
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137
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138 bool is_bracket_or_brace (void)
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139 {
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140 return (! context.empty ()
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141 && (context.top () == BRACKET || context.top () == BRACE));
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142 }
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143
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144 bool none (void) { return context.empty (); }
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145
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146 void remove (void)
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147 {
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148 if (! context.empty ())
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149 context.pop ();
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150 }
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151
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152 void clear (void)
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153 {
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154 while (! context.empty ())
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155 context.pop ();
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156 }
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157
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158 private:
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159
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160 std::stack<int> context;
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161 };
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162
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163 lexical_feedback (void)
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164 : end_of_input (false), convert_spaces_to_comma (true),
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165 do_comma_insert (false), at_beginning_of_statement (true),
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166 looking_at_anon_fcn_args (false), looking_at_return_list (false),
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167 looking_at_parameter_list (false), looking_at_decl_list (false),
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168 looking_at_initializer_expression (false),
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169 looking_at_matrix_or_assign_lhs (false),
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170 looking_for_object_index (false),
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171 looking_at_indirect_ref (false), parsing_class_method (false),
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172 maybe_classdef_get_set_method (false), parsing_classdef (false),
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173 quote_is_transpose (false), force_script (false),
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174 reading_fcn_file (false), reading_script_file (false),
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175 reading_classdef_file (false),
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176 input_line_number (1), current_input_column (1),
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177 bracketflag (0), braceflag (0),
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178 looping (0), defining_func (0), looking_at_function_handle (0),
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179 block_comment_nesting_level (0), token_count (0),
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180 current_input_line (), help_text (), fcn_file_name (),
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181 fcn_file_full_name (), looking_at_object_index (),
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182 parsed_function_name (), pending_local_variables (),
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183 nesting_level (), token_stack ()
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184 {
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185 init ();
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186 }
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187
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188 ~lexical_feedback (void);
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189
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190 void init (void);
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191
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192 void reset (void);
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193
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194 // true means that we have encountered eof on the input stream.
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195 bool end_of_input;
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196
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197 // true means that we should convert spaces to a comma inside a
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198 // matrix definition.
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199 bool convert_spaces_to_comma;
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200
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201 // gag. stupid kludge so that [[1,2][3,4]] will work.
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202 bool do_comma_insert;
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203
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204 // true means we are at the beginning of a statement, where a
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205 // command name is possible.
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206 bool at_beginning_of_statement;
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207
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208 // true means we are parsing an anonymous function argument list.
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209 bool looking_at_anon_fcn_args;
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210
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211 // true means we're parsing the return list for a function.
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212 bool looking_at_return_list;
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213
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214 // true means we're parsing the parameter list for a function.
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215 bool looking_at_parameter_list;
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216
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217 // true means we're parsing a declaration list (global or
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218 // persistent).
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219 bool looking_at_decl_list;
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220
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221 // true means we are looking at the initializer expression for a
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222 // parameter list element.
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223 bool looking_at_initializer_expression;
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224
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225 // true means we're parsing a matrix or the left hand side of
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226 // multi-value assignment statement.
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227 bool looking_at_matrix_or_assign_lhs;
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228
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229 // object index not possible until we've seen something.
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230 bool looking_for_object_index;
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231
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232 // true means we're looking at an indirect reference to a
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233 // structure element.
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234 bool looking_at_indirect_ref;
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235
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236 // true means we are parsing a class method in function or classdef file.
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237 bool parsing_class_method;
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238
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239 // true means we are parsing a class method declaration line in a
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240 // classdef file and can accept a property get or set method name.
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241 // for example, "get.propertyname" is recognized as a function name.
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242 bool maybe_classdef_get_set_method;
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243
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244 // true means we are parsing a classdef file
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245 bool parsing_classdef;
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246
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247 // return transpose or start a string?
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248 bool quote_is_transpose;
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249
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250 // TRUE means treat the current file as a script even if the first
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251 // token is "function" or "classdef".
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252 bool force_script;
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253
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254 // TRUE means we're parsing a function file.
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255 bool reading_fcn_file;
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256
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257 // TRUE means we're parsing a script file.
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258 bool reading_script_file;
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259
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260 // TRUE means we're parsing a classdef file.
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261 bool reading_classdef_file;
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262
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263 // the current input line number.
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264 int input_line_number;
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265
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266 // the column of the current token.
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267 int current_input_column;
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268
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269 // square bracket level count.
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270 int bracketflag;
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271
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272 // curly brace level count.
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273 int braceflag;
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274
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275 // true means we're in the middle of defining a loop.
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276 int looping;
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277
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278 // nonzero means we're in the middle of defining a function.
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279 int defining_func;
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280
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281 // nonzero means we are parsing a function handle.
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282 int looking_at_function_handle;
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283
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284 // nestng level for blcok comments.
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285 int block_comment_nesting_level;
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286
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287 // Count of tokens recognized by this lexer since initialized or
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288 // since the last reset.
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289 size_t token_count;
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290
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291 // The current line of input.
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292 std::string current_input_line;
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293
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294 // The current help text.
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295 std::string help_text;
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296
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297 // Simple name of function file we are reading.
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298 std::string fcn_file_name;
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299
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300 // Full name of file we are reading.
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301 std::string fcn_file_full_name;
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302
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303 // if the front of the list is true, the closest paren, brace, or
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304 // bracket nesting is an index for an object.
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305 std::list<bool> looking_at_object_index;
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306
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307 // if the top of the stack is true, then we've already seen the name
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308 // of the current function. should only matter if
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309 // current_function_level > 0
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310 std::stack<bool> parsed_function_name;
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311
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312 // set of identifiers that might be local variable names.
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313 std::set<std::string> pending_local_variables;
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314
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315 // is the closest nesting level a square bracket, squiggly brace or
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316 // a paren?
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317 bbp_nesting_level nesting_level;
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318
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319 // Stack to hold tokens so that we can delete them when the parser is
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320 // reset and avoid growing forever just because we are stashing some
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321 // information.
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322 std::stack <token*> token_stack;
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323
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324 private:
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325
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326 void reset_token_stack (void);
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327
16193
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328 // No copying!
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329
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330 lexical_feedback (const lexical_feedback&);
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331
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332 lexical_feedback& operator = (const lexical_feedback&);
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333 };
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334
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335 // octave_lexer inherits from lexical_feedback because we will
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336 // eventually have several different constructors and it is easier to
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337 // intialize if everything is grouped in a parent class rather than
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338 // listing all the members in the octave_lexer class.
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339
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340 class
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341 octave_lexer : public lexical_feedback
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342 {
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343 public:
16104
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344
16183
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345 // Handle buffering of input for lexer.
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346
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347 class input_buffer
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348 {
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349 public:
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350
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351 input_buffer (void)
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352 : buffer (), pos (0), chars_left (0), eof (false)
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353 { }
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354
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355 void fill (const std::string& input, bool eof_arg);
16183
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356
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357 // Copy at most max_size characters to buf.
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358 int copy_chunk (char *buf, size_t max_size);
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359
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360 bool empty (void) const { return chars_left == 0; }
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361
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362 bool at_eof (void) const { return eof; }
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363
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364 private:
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365
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366 std::string buffer;
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367 const char *pos;
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368 size_t chars_left;
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369 bool eof;
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370 };
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371
16158
7eb614760ddb rename lexical_feedback to octave_lexer
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372 octave_lexer (void)
16195
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373 : lexical_feedback (), scanner (0), input_buf (), input_reader ()
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374 {
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375 init ();
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376 }
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377
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378 octave_lexer (FILE *file)
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379 : lexical_feedback (), scanner (0), input_buf (),
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380 input_reader (file)
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381 {
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382 init ();
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383 }
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384
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385 octave_lexer (const std::string& eval_string)
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386 : lexical_feedback (), scanner (0), input_buf (),
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387 input_reader (eval_string)
16101
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388 {
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389 init ();
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390 }
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391
16158
7eb614760ddb rename lexical_feedback to octave_lexer
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diff changeset
392 ~octave_lexer (void);
1826
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jwe
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393
16149
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394 void init (void);
1826
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diff changeset
395
16139
2fd39ab12209 move a function and data member from lexical_feedback to octave_parser
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diff changeset
396 void reset (void);
16122
6884401b2fbb move reset_parser lexer helper function to lexical_feedback class
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diff changeset
397
16203
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diff changeset
398 void prep_for_file (void);
16124
3be725cd195b move more lexer helper functions to lexical_feedback class
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parents: 16122
diff changeset
399
16195
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diff changeset
400 int read (char *buf, unsigned int max_size);
16120
4b68eb9b98b0 move octave_read lexer helper function to lexical_feedback class
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parents: 16118
diff changeset
401
16164
c5bfdc4c0963 move end_of_input flag from octve_parser class to octave_lexer class
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diff changeset
402 int handle_end_of_input (void);
c5bfdc4c0963 move end_of_input flag from octve_parser class to octave_lexer class
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parents: 16158
diff changeset
403
16128
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John W. Eaton <jwe@octave.org>
parents: 16126
diff changeset
404 char *flex_yytext (void);
210039e91ad6 localize use of yytext with lexical_feedback member function
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parents: 16126
diff changeset
405
16130
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John W. Eaton <jwe@octave.org>
parents: 16129
diff changeset
406 int flex_yyleng (void);
421dea028bbf localize use of yyleng with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16129
diff changeset
407
16113
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
408 void do_comma_insert_check (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
409
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
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diff changeset
410 int text_yyinput (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
411
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
412 void xunput (char c, char *buf);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
413
16125
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John W. Eaton <jwe@octave.org>
parents: 16124
diff changeset
414 void xunput (char c);
96a58f197f93 allow xunput to be called without buffer argument
John W. Eaton <jwe@octave.org>
parents: 16124
diff changeset
415
16113
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
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diff changeset
416 void fixup_column_count (char *s);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
417
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
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diff changeset
418 bool inside_any_object_index (void);
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parents: 16111
diff changeset
419
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
420 int is_keyword_token (const std::string& s);
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diff changeset
421
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
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diff changeset
422 bool is_variable (const std::string& name);
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diff changeset
423
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
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diff changeset
424 std::string grab_block_comment (stream_reader& reader, bool& eof);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
425
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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diff changeset
426 std::string grab_comment_block (stream_reader& reader, bool at_bol,
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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parents: 16111
diff changeset
427 bool& eof);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
428
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
429 int process_comment (bool start_in_block, bool& eof);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
430
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
431 bool next_token_is_sep_op (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
432
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
433 bool next_token_is_postfix_unary_op (bool spc_prev);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
434
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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parents: 16111
diff changeset
435 bool next_token_is_bin_op (bool spc_prev);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
436
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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parents: 16111
diff changeset
437 void scan_for_comments (const char *text);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
438
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
439 int eat_whitespace (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
440
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
441 void handle_number (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
442
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
443 bool have_continuation (bool trailing_comments_ok = true);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
444
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
445 bool have_ellipsis_continuation (bool trailing_comments_ok = true);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
446
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
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diff changeset
447 int eat_continuation (void);
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parents: 16111
diff changeset
448
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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parents: 16111
diff changeset
449 int handle_string (char delim);
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parents: 16111
diff changeset
450
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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parents: 16111
diff changeset
451 bool next_token_is_assign_op (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
452
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
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parents: 16111
diff changeset
453 bool next_token_is_index_op (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
454
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
455 int handle_close_bracket (bool spc_gobbled, int bracket_type);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
456
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
457 void maybe_unput_comma (int spc_gobbled);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
458
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
459 bool next_token_can_follow_bin_op (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
460
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
461 bool looks_like_command_arg (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
462
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
463 int handle_superclass_identifier (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
464
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
465 int handle_meta_identifier (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
466
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
467 int handle_identifier (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
468
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
469 void maybe_warn_separator_insert (char sep);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
470
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
471 void gripe_single_quote_string (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
472
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
473 void gripe_matlab_incompatible (const std::string& msg);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
474
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
475 void maybe_gripe_matlab_incompatible_comment (char c);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
476
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
477 void gripe_matlab_incompatible_continuation (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
478
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
479 void gripe_matlab_incompatible_operator (const std::string& op);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
480
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
481 void push_token (token *);
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
482
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
483 token *current_token (void);
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
484
16118
f8e463523229 move more static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
485 void display_token (int tok);
f8e463523229 move more static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
486
16129
053b0364b507 localize use of yy_fatal_error with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16128
diff changeset
487 void fatal_error (const char *msg);
053b0364b507 localize use of yy_fatal_error with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16128
diff changeset
488
16118
f8e463523229 move more static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
489 void lexer_debug (const char *pattern, const char *text);
f8e463523229 move more static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
490
16149
49dfba4fd3c5 use pure parser and reentrant lexer interfaces
John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
491 // Internal state of the flex-generated lexer.
49dfba4fd3c5 use pure parser and reentrant lexer interfaces
John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
492 void *scanner;
49dfba4fd3c5 use pure parser and reentrant lexer interfaces
John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
493
16183
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
494 // Object that reads and buffers input.
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
495 input_buffer input_buf;
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
496
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
497 octave_input_reader input_reader;
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
498
16209
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
499 void increment_promptflag (void) { input_reader.increment_promptflag (); }
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
500
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
501 void decrement_promptflag (void) { input_reader.decrement_promptflag (); }
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
502
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
503 int promptflag (void) const { return input_reader.promptflag (); }
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
504
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
505 int promptflag (int n) { return input_reader.promptflag (n); }
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
506
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
507 std::string input_source (void) const
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
508 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
509 return input_reader.input_source ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
510 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
511
16203
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
512 bool input_from_terminal (void) const
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
513 {
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
514 return input_source () == "terminal";
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
515 }
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
516
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
517 bool input_from_file (void) const
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
518 {
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
519 return input_source () == "file";
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
520 }
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
521
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
522 bool input_from_eval_string (void) const
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
523 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
524 return input_source () == "eval_string";
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
525 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
526
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
527 // For unwind protect.
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
528 static void cleanup (octave_lexer *lexer) { delete lexer; }
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
529
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
530 private:
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
531
16110
7302f8a4df83 use pointer for global lexical_feedback structure
John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
532 // No copying!
7302f8a4df83 use pointer for global lexical_feedback structure
John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
533
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
534 octave_lexer (const octave_lexer&);
16110
7302f8a4df83 use pointer for global lexical_feedback structure
John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
535
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
536 octave_lexer& operator = (const octave_lexer&);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
537 };
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
538
1
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
jwe
parents:
diff changeset
539 #endif