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annotate libinterp/parse-tree/lex.h @ 16278:ea78011f66bf classdef

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maint: periodic merge of default to classdef
author John W. Eaton <jwe@octave.org>
date Mon, 11 Mar 2013 15:12:33 -0400
parents 26fd237a3427 8cb65fd72164
children f58257a6d18c
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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
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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
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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 <deque>
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27 #include <limits>
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28 #include <list>
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29 #include <set>
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30 #include <stack>
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31
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32 #include "comment-list.h"
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33 #include "input.h"
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34 #include "token.h"
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35
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36 extern OCTINTERP_API void cleanup_parser (void);
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37
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38 // Is the given string a keyword?
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39 extern bool is_keyword (const std::string& s);
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40
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41 class
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42 stream_reader
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43 {
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44 public:
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45 virtual int getc (void) = 0;
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46 virtual int ungetc (int c) = 0;
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47
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48 protected:
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49 stream_reader (void) { }
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50 ~stream_reader (void) { }
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51
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52 private:
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53
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54 // No copying!
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55 stream_reader (const stream_reader&);
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56 stream_reader& operator = (const stream_reader&);
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57 };
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58
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59 // For communication between the lexer and parser.
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60
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61 class
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62 lexical_feedback
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63 {
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64 public:
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65
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66 // Track nesting of square brackets, curly braces, and parentheses.
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67
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68 class bbp_nesting_level
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69 {
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70 private:
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71
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72 enum bracket_type
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73 {
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74 BRACKET = 1,
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75 BRACE = 2,
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76 PAREN = 3,
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77 ANON_FCN_BODY = 4
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78 };
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79
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80 public:
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81
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82 bbp_nesting_level (void) : context () { }
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83
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84 bbp_nesting_level (const bbp_nesting_level& nl) : context (nl.context) { }
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85
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86 bbp_nesting_level& operator = (const bbp_nesting_level& nl)
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87 {
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88 if (&nl != this)
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89 context = nl.context;
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90
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91 return *this;
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92 }
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93
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94 ~bbp_nesting_level (void) { }
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95
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96 void reset (void)
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97 {
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98 while (! context.empty ())
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99 context.pop ();
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100 }
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101
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102 void bracket (void) { context.push (BRACKET); }
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103
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104 bool is_bracket (void)
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105 {
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106 return ! context.empty () && context.top () == BRACKET;
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107 }
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108
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109 void brace (void) { context.push (BRACE); }
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110
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111 bool is_brace (void)
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112 {
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113 return ! context.empty () && context.top () == BRACE;
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114 }
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115
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116 void paren (void) { context.push (PAREN); }
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117
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118 bool is_paren (void)
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119 {
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120 return ! context.empty () && context.top () == PAREN;
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121 }
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122
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123 void anon_fcn_body (void) { context.push (ANON_FCN_BODY); }
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124
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125 bool is_anon_fcn_body (void)
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126 {
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127 return ! context.empty () && context.top () == ANON_FCN_BODY;
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128 }
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129
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130 bool is_bracket_or_brace (void)
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131 {
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132 return (! context.empty ()
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133 && (context.top () == BRACKET || context.top () == BRACE));
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134 }
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135
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136 bool none (void) { return context.empty (); }
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137
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138 void remove (void)
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139 {
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140 if (! context.empty ())
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141 context.pop ();
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142 }
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143
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144 void clear (void)
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145 {
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146 while (! context.empty ())
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147 context.pop ();
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148 }
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149
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150 private:
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151
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152 std::stack<int> context;
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153 };
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154
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155 class token_cache
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156 {
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157 public:
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158
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159 // Store an "unlimited" number of tokens.
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160 token_cache (size_t sz_arg = std::numeric_limits<size_t>::max ())
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161 : buffer (), sz (sz_arg)
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162 { }
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163
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164 void push (token *tok)
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165 {
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166 if (buffer.size () == sz)
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167 pop ();
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168
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169 buffer.push_front (tok);
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170 }
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171
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172 void pop (void)
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173 {
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174 if (! empty ())
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175 {
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176 delete buffer.back ();
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177 buffer.pop_back ();
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178 }
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179 }
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180
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181 // Direct access.
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182 token *at (size_t n)
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183 {
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184 return empty () ? 0 : buffer.at (n);
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185 }
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186
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187 const token *at (size_t n) const
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188 {
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189 return empty () ? 0 : buffer.at (n);
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190 }
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191
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192 // Most recently pushed.
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193 token *front (void)
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194 {
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195 return empty () ? 0 : buffer.front ();
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196 }
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197
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198 const token *front (void) const
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199 {
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200 return empty () ? 0 : buffer.front ();
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201 }
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202
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203 token *back (void)
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204 {
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205 return empty () ? 0 : buffer.back ();
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206 }
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207
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208 const token *back (void) const
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209 {
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210 return empty () ? 0 : buffer.back ();
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211 }
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212
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213 // Number of elements currently in the buffer, max of sz.
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214 size_t size (void) const { return buffer.size (); }
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215
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216 bool empty (void) const { return buffer.empty (); }
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217
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218 void clear (void)
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219 {
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220 while (! empty ())
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221 pop ();
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222 }
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223
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224 private:
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225
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226 std::deque<token *> buffer;
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227
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228 size_t sz;
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229
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230 // No copying!
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231
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232 token_cache (const token_cache&);
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233
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234 token_cache& operator = (const token_cache&);
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235 };
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236
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237 lexical_feedback (void)
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238 : end_of_input (false), at_beginning_of_statement (true),
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239 looking_at_anon_fcn_args (false), looking_at_return_list (false),
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240 looking_at_parameter_list (false), looking_at_decl_list (false),
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241 looking_at_initializer_expression (false),
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242 looking_at_matrix_or_assign_lhs (false),
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243 looking_for_object_index (false),
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244 looking_at_indirect_ref (false), parsing_class_method (false),
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245 parsing_classdef (false), maybe_classdef_get_set_method (false),
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246 parsing_classdef_get_method (false),
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247 parsing_classdef_set_method (false),
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248 quote_is_transpose (false), force_script (false),
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249 reading_fcn_file (false), reading_script_file (false),
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250 reading_classdef_file (false),
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251 input_line_number (1), current_input_column (1),
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252 bracketflag (0), braceflag (0),
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253 looping (0), defining_func (0), looking_at_function_handle (0),
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254 block_comment_nesting_level (0), token_count (0),
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255 current_input_line (), comment_text (), help_text (),
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256 fcn_file_name (), fcn_file_full_name (), looking_at_object_index (),
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257 parsed_function_name (), pending_local_variables (),
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258 nesting_level (), tokens ()
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259 {
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260 init ();
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261 }
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262
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263 ~lexical_feedback (void);
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264
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265 void init (void);
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266
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267 void reset (void);
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268
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269 int previous_token_value (void) const;
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270
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271 bool previous_token_value_is (int tok_val) const;
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272
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273 void mark_previous_token_trailing_space (void);
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274
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275 bool space_follows_previous_token (void) const;
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276
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277 bool previous_token_is_binop (void) const;
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278
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279 bool previous_token_is_keyword (void) const;
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280
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281 bool previous_token_may_be_command (void) const;
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282
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283 // true means that we have encountered eof on the input stream.
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284 bool end_of_input;
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285
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286 // true means we are at the beginning of a statement, where a
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287 // command name is possible.
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288 bool at_beginning_of_statement;
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289
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290 // true means we are parsing an anonymous function argument list.
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291 bool looking_at_anon_fcn_args;
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292
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293 // true means we're parsing the return list for a function.
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294 bool looking_at_return_list;
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295
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296 // true means we're parsing the parameter list for a function.
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297 bool looking_at_parameter_list;
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298
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299 // true means we're parsing a declaration list (global or
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300 // persistent).
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301 bool looking_at_decl_list;
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302
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303 // true means we are looking at the initializer expression for a
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304 // parameter list element.
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305 bool looking_at_initializer_expression;
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306
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307 // true means we're parsing a matrix or the left hand side of
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308 // multi-value assignment statement.
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309 bool looking_at_matrix_or_assign_lhs;
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310
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311 // object index not possible until we've seen something.
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312 bool looking_for_object_index;
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313
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314 // true means we're looking at an indirect reference to a
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315 // structure element.
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316 bool looking_at_indirect_ref;
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317
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318 // true means we are parsing a class method in function or classdef file.
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319 bool parsing_class_method;
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320
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321 // true means we are parsing a classdef file
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322 bool parsing_classdef;
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323
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324 // true means we are parsing a class method declaration line in a
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325 // classdef file and can accept a property get or set method name.
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326 // for example, "get.propertyname" is recognized as a function name.
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327 bool maybe_classdef_get_set_method;
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328
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329 // TRUE means we are parsing a classdef get.method.
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330 bool parsing_classdef_get_method;
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331
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332 // TRUE means we are parsing a classdef set.method.
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333 bool parsing_classdef_set_method;
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334
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335 // return transpose or start a string?
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336 bool quote_is_transpose;
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337
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338 // TRUE means treat the current file as a script even if the first
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339 // token is "function" or "classdef".
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340 bool force_script;
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341
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342 // TRUE means we're parsing a function file.
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343 bool reading_fcn_file;
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344
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345 // TRUE means we're parsing a script file.
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346 bool reading_script_file;
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347
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348 // TRUE means we're parsing a classdef file.
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349 bool reading_classdef_file;
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350
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351 // the current input line number.
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352 int input_line_number;
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353
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354 // the column of the current token.
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355 int current_input_column;
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356
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357 // square bracket level count.
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358 int bracketflag;
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359
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360 // curly brace level count.
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361 int braceflag;
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362
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363 // true means we're in the middle of defining a loop.
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364 int looping;
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365
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366 // nonzero means we're in the middle of defining a function.
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367 int defining_func;
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368
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369 // nonzero means we are parsing a function handle.
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370 int looking_at_function_handle;
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371
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372 // nestng level for blcok comments.
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373 int block_comment_nesting_level;
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374
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375 // Count of tokens recognized by this lexer since initialized or
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376 // since the last reset.
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377 size_t token_count;
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378
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379 // The current line of input.
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380 std::string current_input_line;
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381
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382 // The current comment text.
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383 std::string comment_text;
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384
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385 // The current help text.
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386 std::string help_text;
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387
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388 // Simple name of function file we are reading.
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389 std::string fcn_file_name;
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390
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391 // Full name of file we are reading.
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392 std::string fcn_file_full_name;
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393
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394 // if the front of the list is true, the closest paren, brace, or
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395 // bracket nesting is an index for an object.
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396 std::list<bool> looking_at_object_index;
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397
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398 // if the top of the stack is true, then we've already seen the name
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399 // of the current function. should only matter if
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400 // current_function_level > 0
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401 std::stack<bool> parsed_function_name;
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402
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403 // set of identifiers that might be local variable names.
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404 std::set<std::string> pending_local_variables;
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405
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406 // is the closest nesting level a square bracket, squiggly brace,
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407 // a paren, or an anonymous function body?
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408 bbp_nesting_level nesting_level;
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409
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410 // Tokens generated by the lexer.
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411 token_cache tokens;
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412
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413 private:
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414
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415 // No copying!
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416
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417 lexical_feedback (const lexical_feedback&);
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418
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419 lexical_feedback& operator = (const lexical_feedback&);
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420 };
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421
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422 // octave_lexer inherits from lexical_feedback because we will
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423 // eventually have several different constructors and it is easier to
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424 // intialize if everything is grouped in a parent class rather than
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425 // listing all the members in the octave_lexer class.
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426
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427 class
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428 octave_lexer : public lexical_feedback
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429 {
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430 public:
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431
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432 // Handle buffering of input for lexer.
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433
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434 class input_buffer
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435 {
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436 public:
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437
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438 input_buffer (void)
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439 : buffer (), pos (0), chars_left (0), eof (false)
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parents: 16164
diff changeset
440 { }
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
441
16195
b52d2f9294b6 use class for reading lexer input
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parents: 16194
diff changeset
442 void fill (const std::string& input, bool eof_arg);
16183
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parents: 16164
diff changeset
443
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
444 // Copy at most max_size characters to buf.
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
445 int copy_chunk (char *buf, size_t max_size);
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
446
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
447 bool empty (void) const { return chars_left == 0; }
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
448
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
449 bool at_eof (void) const { return eof; }
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
450
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
451 private:
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
452
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
453 std::string buffer;
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
454 const char *pos;
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
455 size_t chars_left;
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
456 bool eof;
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
457 };
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
458
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
459 octave_lexer (void)
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
460 : lexical_feedback (), scanner (0), input_buf (), input_reader ()
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
461 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
462 init ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
463 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
464
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
465 octave_lexer (FILE *file)
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
466 : lexical_feedback (), scanner (0), input_buf (),
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
467 input_reader (file)
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
468 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
469 init ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
470 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
471
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
472 octave_lexer (const std::string& eval_string)
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
473 : lexical_feedback (), scanner (0), input_buf (),
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
474 input_reader (eval_string)
16101
8d19626b38ae provide copy contructor and operator = for lexical_feedback class.
John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
475 {
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John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
476 init ();
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John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
477 }
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John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
478
16158
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John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
479 ~octave_lexer (void);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
480
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John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
481 void init (void);
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jwe
parents: 1315
diff changeset
482
16139
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John W. Eaton <jwe@octave.org>
parents: 16130
diff changeset
483 void reset (void);
16122
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John W. Eaton <jwe@octave.org>
parents: 16120
diff changeset
484
16203
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John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
485 void prep_for_file (void);
16124
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John W. Eaton <jwe@octave.org>
parents: 16122
diff changeset
486
16195
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John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
487 int read (char *buf, unsigned int max_size);
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John W. Eaton <jwe@octave.org>
parents: 16118
diff changeset
488
16164
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John W. Eaton <jwe@octave.org>
parents: 16158
diff changeset
489 int handle_end_of_input (void);
c5bfdc4c0963 move end_of_input flag from octve_parser class to octave_lexer class
John W. Eaton <jwe@octave.org>
parents: 16158
diff changeset
490
16128
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John W. Eaton <jwe@octave.org>
parents: 16126
diff changeset
491 char *flex_yytext (void);
210039e91ad6 localize use of yytext with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16126
diff changeset
492
16130
421dea028bbf localize use of yyleng with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16129
diff changeset
493 int flex_yyleng (void);
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John W. Eaton <jwe@octave.org>
parents: 16129
diff changeset
494
16113
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
495 int text_yyinput (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
496
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
497 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
498
16125
96a58f197f93 allow xunput to be called without buffer argument
John W. Eaton <jwe@octave.org>
parents: 16124
diff changeset
499 void xunput (char c);
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John W. Eaton <jwe@octave.org>
parents: 16124
diff changeset
500
16275
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John W. Eaton <jwe@octave.org>
parents: 16267
diff changeset
501 bool looking_at_space (void);
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John W. Eaton <jwe@octave.org>
parents: 16267
diff changeset
502
16113
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
503 bool inside_any_object_index (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
504
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
505 int is_keyword_token (const std::string& s);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
506
16257
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John W. Eaton <jwe@octave.org>
parents: 16255
diff changeset
507 bool whitespace_is_significant (void);
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John W. Eaton <jwe@octave.org>
parents: 16255
diff changeset
508
16113
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
509 void handle_number (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
510
16253
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John W. Eaton <jwe@octave.org>
parents: 16231
diff changeset
511 void handle_continuation (void);
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John W. Eaton <jwe@octave.org>
parents: 16231
diff changeset
512
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John W. Eaton <jwe@octave.org>
parents: 16231
diff changeset
513 void finish_comment (octave_comment_elt::comment_type typ,
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John W. Eaton <jwe@octave.org>
parents: 16231
diff changeset
514 bool looking_at_continuation = false);
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John W. Eaton <jwe@octave.org>
parents: 16231
diff changeset
515
16113
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
516 bool have_continuation (bool trailing_comments_ok = true);
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parents: 16111
diff changeset
517
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
518 bool have_ellipsis_continuation (bool trailing_comments_ok = true);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
519
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
520 int handle_string (char delim);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
521
16259
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parents: 16257
diff changeset
522 int handle_close_bracket (int bracket_type);
16113
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
523
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
524 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
525
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
526 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
527
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
528 int handle_superclass_identifier (void);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
529
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
530 int handle_meta_identifier (void);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
531
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
532 int handle_identifier (void);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
533
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
534 void maybe_warn_separator_insert (char sep);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
535
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
536 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
537
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
538 void gripe_matlab_incompatible (const std::string& msg);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
539
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
540 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
541
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
542 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
543
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
544 void gripe_matlab_incompatible_operator (const std::string& op);
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John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
545
16126
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John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
546 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
547
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John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
548 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
549
16118
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John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
550 void display_token (int tok);
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John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
551
16129
053b0364b507 localize use of yy_fatal_error with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16128
diff changeset
552 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
553
16229
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John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
554 void lexer_debug (const char *pattern);
16118
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John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
555
16149
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John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
556 // Internal state of the flex-generated lexer.
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John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
557 void *scanner;
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John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
558
16183
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
559 // Object that reads and buffers input.
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
560 input_buffer input_buf;
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John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
561
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
562 octave_input_reader input_reader;
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
563
16209
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John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
564 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
565
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
566 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
567
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
568 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
569
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John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
570 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
571
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
572 std::string input_source (void) const
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
573 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
574 return input_reader.input_source ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
575 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
576
16203
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John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
577 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
578 {
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John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
579 return input_source () == "terminal";
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
580 }
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
581
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
582 bool input_from_file (void) const
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583 {
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584 return input_source () == "file";
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585 }
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parents: 16199
diff changeset
586
16195
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587 bool input_from_eval_string (void) const
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parents: 16194
diff changeset
588 {
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parents: 16194
diff changeset
589 return input_source () == "eval_string";
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590 }
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parents: 16194
diff changeset
591
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592 void push_start_state (int state);
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parents: 16209
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593
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parents: 16209
diff changeset
594 void pop_start_state (void);
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595
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596 void clear_start_state (void);
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parents: 16209
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597
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598 int start_state (void) const { return start_state_stack.top (); }
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parents: 16209
diff changeset
599
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parents: 16209
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600 void display_start_state (void) const;
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diff changeset
601
16275
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diff changeset
602 int handle_op (const char *pattern, int tok, bool bos = false);
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parents: 16228
diff changeset
603
16275
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diff changeset
604 int handle_incompatible_op (const char *pattern, int tok, bool bos = false);
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parents: 16228
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605
16263
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parents: 16259
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606 bool maybe_unput_comma_before_unary_op (int tok);
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parents: 16259
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607
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diff changeset
608 int handle_unary_op (int tok, bool bos = false);
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parents: 16259
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609
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diff changeset
610 int handle_incompatible_unary_op (int tok, bool bos = false);
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parents: 16259
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611
16257
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parents: 16255
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612 int handle_assign_op (const char *pattern, int tok);
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parents: 16255
diff changeset
613
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parents: 16255
diff changeset
614 int handle_incompatible_assign_op (const char *pattern, int tok);
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parents: 16255
diff changeset
615
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616 int handle_op_internal (int tok, bool bos, bool compat);
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parents: 16228
diff changeset
617
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parents: 16230
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618 int handle_token (const std::string& name, int tok);
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619
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parents: 16230
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620 int handle_token (int tok, token *tok_val = 0);
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parents: 16228
diff changeset
621
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622 int count_token (int tok);
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parents: 16228
diff changeset
623
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624 int count_token_internal (int tok);
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parents: 16255
diff changeset
625
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parents: 16228
diff changeset
626 int show_token (int tok);
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parents: 16228
diff changeset
627
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parents: 16125
diff changeset
628 // For unwind protect.
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parents: 16149
diff changeset
629 static void cleanup (octave_lexer *lexer) { delete lexer; }
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parents: 16125
diff changeset
630
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parents: 16125
diff changeset
631 private:
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parents: 16125
diff changeset
632
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diff changeset
633 std::stack<int> start_state_stack;
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parents: 16209
diff changeset
634
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parents: 16107
diff changeset
635 // No copying!
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parents: 16107
diff changeset
636
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diff changeset
637 octave_lexer (const octave_lexer&);
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parents: 16107
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638
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parents: 16149
diff changeset
639 octave_lexer& operator = (const octave_lexer&);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
640 };
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
641
1
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
jwe
parents:
diff changeset
642 #endif