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annotate libinterp/parse-tree/lex.h @ 16231:2b15ae55c721

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put all tokens in the token cache * lex.h, lex.ll (octave_lexer::handle_token (int, token *)): New arg, tok_val, with default value 0. If tok_val is 0, create token object. Put token object in the token cache. (octave_lexer::handle_token (const std::string&, int)): Rename from push_token. Change all uses. Create token and pass to octave_lexer::handle_token (int, tok_val *).
author John W. Eaton <jwe@octave.org>
date Sat, 09 Mar 2013 02:02:22 -0500
parents 4bf907906134
children d8c0f46efaf0 a89cf57ba3a5
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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 // Did eat_whitespace or eat_continuation eat a space or tab, or a
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67 // newline, or both?
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68 //
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69 // Functions that return this type will return a logical OR of the
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70 // following values:
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71 //
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72 // NO_WHITESPACE no spaces to eat
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73 // SPACE_OR_TAB space or tab in input
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74 // NEWLINE bare new line in input
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75
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76 enum whitespace_type
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77 {
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78 NO_WHITESPACE = 1,
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79 SPACE_OR_TAB = 2,
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80 NEWLINE = 4
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81 };
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82
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83 // Track nesting of square brackets, curly braces, and parentheses.
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84
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85 class bbp_nesting_level
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86 {
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87 private:
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88
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89 enum bracket_type
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90 {
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91 BRACKET = 1,
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92 BRACE = 2,
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93 PAREN = 3
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94 };
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95
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96 public:
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97
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98 bbp_nesting_level (void) : context () { }
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99
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100 bbp_nesting_level (const bbp_nesting_level& nl) : context (nl.context) { }
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101
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102 bbp_nesting_level& operator = (const bbp_nesting_level& nl)
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103 {
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104 if (&nl != this)
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105 context = nl.context;
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106
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107 return *this;
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108 }
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109
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110 ~bbp_nesting_level (void) { }
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111
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112 void reset (void)
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113 {
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114 while (! context.empty ())
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115 context.pop ();
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116 }
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117
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118 void bracket (void) { context.push (BRACKET); }
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119
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120 bool is_bracket (void)
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121 {
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122 return ! context.empty () && context.top () == BRACKET;
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123 }
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124
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125 void brace (void) { context.push (BRACE); }
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126
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127 bool is_brace (void)
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128 {
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129 return ! context.empty () && context.top () == BRACE;
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130 }
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131
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132 void paren (void) { context.push (PAREN); }
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133
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134 bool is_paren (void)
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135 {
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136 return ! context.empty () && context.top () == PAREN;
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137 }
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138
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139 bool is_bracket_or_brace (void)
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140 {
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141 return (! context.empty ()
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142 && (context.top () == BRACKET || context.top () == BRACE));
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143 }
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144
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145 bool none (void) { return context.empty (); }
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146
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147 void remove (void)
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148 {
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149 if (! context.empty ())
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150 context.pop ();
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151 }
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152
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153 void clear (void)
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154 {
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155 while (! context.empty ())
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156 context.pop ();
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157 }
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158
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159 private:
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160
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161 std::stack<int> context;
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162 };
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163
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164 class token_cache
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165 {
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166 public:
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167
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168 // Store an "unlimited" number of tokens.
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169 token_cache (size_t sz_arg = std::numeric_limits<size_t>::max ())
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170 : buffer (), sz (sz_arg)
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171 { }
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172
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173 void push (token *tok)
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174 {
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175 if (buffer.size () == sz)
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176 pop ();
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177
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178 buffer.push_front (tok);
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179 }
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180
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181 void pop (void)
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182 {
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183 if (! empty ())
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184 {
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185 delete buffer.back ();
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186 buffer.pop_back ();
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187 }
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188 }
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189
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190 // Direct access.
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191 token *at (size_t n) { return buffer.at (n); }
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192 const token *at (size_t n) const { return buffer.at (n); }
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193
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194 // Most recently pushed.
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195 token *front (void) { return buffer.front (); }
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196 const token *front (void) const { return buffer.front (); }
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197
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198 token *back (void) { return buffer.back (); }
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199 const token *back (void) const { return buffer.back (); }
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200
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201 // Number of elements currently in the buffer, max of sz.
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202 size_t size (void) const { return buffer.size (); }
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203
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204 bool empty (void) const { return buffer.empty (); }
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205
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206 void clear (void)
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207 {
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208 while (! empty ())
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209 pop ();
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210 }
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211
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212 private:
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213
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214 std::deque<token *> buffer;
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215
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216 size_t sz;
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217
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218 // No copying!
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219
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220 token_cache (const token_cache&);
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221
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222 token_cache& operator = (const token_cache&);
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223 };
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224
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225 lexical_feedback (void)
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226 : end_of_input (false), convert_spaces_to_comma (true),
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227 do_comma_insert (false), at_beginning_of_statement (true),
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228 looking_at_anon_fcn_args (false), looking_at_return_list (false),
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229 looking_at_parameter_list (false), looking_at_decl_list (false),
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230 looking_at_initializer_expression (false),
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231 looking_at_matrix_or_assign_lhs (false),
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232 looking_for_object_index (false),
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233 looking_at_indirect_ref (false), parsing_class_method (false),
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234 maybe_classdef_get_set_method (false), parsing_classdef (false),
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235 quote_is_transpose (false), force_script (false),
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236 reading_fcn_file (false), reading_script_file (false),
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237 reading_classdef_file (false),
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238 input_line_number (1), current_input_column (1),
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239 bracketflag (0), braceflag (0),
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240 looping (0), defining_func (0), looking_at_function_handle (0),
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241 block_comment_nesting_level (0), token_count (0),
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242 current_input_line (), comment_text (), help_text (),
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243 fcn_file_name (), fcn_file_full_name (), looking_at_object_index (),
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244 parsed_function_name (), pending_local_variables (),
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245 nesting_level (), tokens ()
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246 {
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247 init ();
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248 }
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249
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250 ~lexical_feedback (void);
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251
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252 void init (void);
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253
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254 void reset (void);
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255
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256 int finish_comment (octave_comment_elt::comment_type typ);
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257
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258 // true means that we have encountered eof on the input stream.
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259 bool end_of_input;
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260
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261 // true means that we should convert spaces to a comma inside a
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262 // matrix definition.
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263 bool convert_spaces_to_comma;
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264
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265 // gag. stupid kludge so that [[1,2][3,4]] will work.
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266 bool do_comma_insert;
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267
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268 // true means we are at the beginning of a statement, where a
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269 // command name is possible.
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270 bool at_beginning_of_statement;
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271
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272 // true means we are parsing an anonymous function argument list.
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273 bool looking_at_anon_fcn_args;
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274
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275 // true means we're parsing the return list for a function.
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276 bool looking_at_return_list;
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277
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278 // true means we're parsing the parameter list for a function.
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279 bool looking_at_parameter_list;
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280
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281 // true means we're parsing a declaration list (global or
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282 // persistent).
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283 bool looking_at_decl_list;
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284
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285 // true means we are looking at the initializer expression for a
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286 // parameter list element.
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287 bool looking_at_initializer_expression;
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288
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289 // true means we're parsing a matrix or the left hand side of
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290 // multi-value assignment statement.
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291 bool looking_at_matrix_or_assign_lhs;
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292
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293 // object index not possible until we've seen something.
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294 bool looking_for_object_index;
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295
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296 // true means we're looking at an indirect reference to a
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297 // structure element.
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298 bool looking_at_indirect_ref;
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299
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300 // true means we are parsing a class method in function or classdef file.
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301 bool parsing_class_method;
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302
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303 // true means we are parsing a class method declaration line in a
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304 // classdef file and can accept a property get or set method name.
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305 // for example, "get.propertyname" is recognized as a function name.
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306 bool maybe_classdef_get_set_method;
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307
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308 // true means we are parsing a classdef file
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309 bool parsing_classdef;
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310
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311 // return transpose or start a string?
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312 bool quote_is_transpose;
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313
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314 // TRUE means treat the current file as a script even if the first
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315 // token is "function" or "classdef".
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316 bool force_script;
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317
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318 // TRUE means we're parsing a function file.
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319 bool reading_fcn_file;
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320
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321 // TRUE means we're parsing a script file.
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322 bool reading_script_file;
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323
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324 // TRUE means we're parsing a classdef file.
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325 bool reading_classdef_file;
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326
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327 // the current input line number.
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328 int input_line_number;
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329
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330 // the column of the current token.
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331 int current_input_column;
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332
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333 // square bracket level count.
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334 int bracketflag;
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335
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336 // curly brace level count.
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337 int braceflag;
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338
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339 // true means we're in the middle of defining a loop.
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340 int looping;
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341
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342 // nonzero means we're in the middle of defining a function.
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343 int defining_func;
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344
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345 // nonzero means we are parsing a function handle.
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346 int looking_at_function_handle;
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347
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348 // nestng level for blcok comments.
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349 int block_comment_nesting_level;
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350
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351 // Count of tokens recognized by this lexer since initialized or
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352 // since the last reset.
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353 size_t token_count;
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354
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355 // The current line of input.
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356 std::string current_input_line;
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357
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358 // The current comment text.
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359 std::string comment_text;
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360
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361 // The current help text.
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362 std::string help_text;
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363
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364 // Simple name of function file we are reading.
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365 std::string fcn_file_name;
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366
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367 // Full name of file we are reading.
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368 std::string fcn_file_full_name;
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369
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370 // if the front of the list is true, the closest paren, brace, or
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371 // bracket nesting is an index for an object.
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372 std::list<bool> looking_at_object_index;
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373
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374 // if the top of the stack is true, then we've already seen the name
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375 // of the current function. should only matter if
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376 // current_function_level > 0
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377 std::stack<bool> parsed_function_name;
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378
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379 // set of identifiers that might be local variable names.
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380 std::set<std::string> pending_local_variables;
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381
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382 // is the closest nesting level a square bracket, squiggly brace or
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383 // a paren?
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384 bbp_nesting_level nesting_level;
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385
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386 // Tokens generated by the lexer.
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387 token_cache tokens;
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388
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389 private:
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390
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391 // No copying!
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392
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393 lexical_feedback (const lexical_feedback&);
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394
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395 lexical_feedback& operator = (const lexical_feedback&);
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396 };
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397
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398 // octave_lexer inherits from lexical_feedback because we will
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399 // eventually have several different constructors and it is easier to
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400 // intialize if everything is grouped in a parent class rather than
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401 // listing all the members in the octave_lexer class.
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402
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403 class
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404 octave_lexer : public lexical_feedback
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405 {
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406 public:
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407
16183
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408 // Handle buffering of input for lexer.
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409
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410 class input_buffer
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411 {
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412 public:
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413
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414 input_buffer (void)
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415 : buffer (), pos (0), chars_left (0), eof (false)
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416 { }
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417
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418 void fill (const std::string& input, bool eof_arg);
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419
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420 // Copy at most max_size characters to buf.
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421 int copy_chunk (char *buf, size_t max_size);
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422
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423 bool empty (void) const { return chars_left == 0; }
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424
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425 bool at_eof (void) const { return eof; }
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426
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427 private:
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428
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429 std::string buffer;
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430 const char *pos;
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431 size_t chars_left;
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432 bool eof;
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433 };
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434
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435 octave_lexer (void)
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parents: 16194
diff changeset
436 : 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
437 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
438 init ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
439 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
440
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
441 octave_lexer (FILE *file)
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
442 : lexical_feedback (), scanner (0), input_buf (),
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
443 input_reader (file)
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
444 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
445 init ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
446 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
447
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
448 octave_lexer (const std::string& eval_string)
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
449 : lexical_feedback (), scanner (0), input_buf (),
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
450 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
451 {
8d19626b38ae provide copy contructor and operator = for lexical_feedback class.
John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
452 init ();
8d19626b38ae provide copy contructor and operator = for lexical_feedback class.
John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
453 }
8d19626b38ae provide copy contructor and operator = for lexical_feedback class.
John W. Eaton <jwe@octave.org>
parents: 16100
diff changeset
454
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
455 ~octave_lexer (void);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
456
16149
49dfba4fd3c5 use pure parser and reentrant lexer interfaces
John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
457 void init (void);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
458
16139
2fd39ab12209 move a function and data member from lexical_feedback to octave_parser
John W. Eaton <jwe@octave.org>
parents: 16130
diff changeset
459 void reset (void);
16122
6884401b2fbb move reset_parser lexer helper function to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16120
diff changeset
460
16203
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
461 void prep_for_file (void);
16124
3be725cd195b move more lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16122
diff changeset
462
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
463 int read (char *buf, unsigned int max_size);
16120
4b68eb9b98b0 move octave_read lexer helper function to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16118
diff changeset
464
16164
c5bfdc4c0963 move end_of_input flag from octve_parser class to octave_lexer class
John W. Eaton <jwe@octave.org>
parents: 16158
diff changeset
465 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
466
16128
210039e91ad6 localize use of yytext with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16126
diff changeset
467 char *flex_yytext (void);
210039e91ad6 localize use of yytext with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16126
diff changeset
468
16130
421dea028bbf localize use of yyleng with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16129
diff changeset
469 int flex_yyleng (void);
421dea028bbf localize use of yyleng with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16129
diff changeset
470
16113
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
471 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
472
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
473 int text_yyinput (void);
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 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
476
16125
96a58f197f93 allow xunput to be called without buffer argument
John W. Eaton <jwe@octave.org>
parents: 16124
diff changeset
477 void xunput (char c);
96a58f197f93 allow xunput to be called without buffer argument
John W. Eaton <jwe@octave.org>
parents: 16124
diff changeset
478
16113
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
479 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
480
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
481 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
482
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
483 int is_keyword_token (const std::string& s);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
484
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
485 bool is_variable (const std::string& name);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
486
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
487 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
488
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
489 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
490
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
491 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
492
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
493 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
494
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
495 int eat_whitespace (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 handle_number (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
498
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
499 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
500
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
501 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
502
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
503 int eat_continuation (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 handle_string (char delim);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
506
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
507 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
508
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
509 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
510
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
511 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
512
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
513 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
514
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
515 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
516
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
517 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
518
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
519 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
520
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
521 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
522
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
523 int handle_identifier (void);
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
524
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
525 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
526
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
527 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
528
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
529 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
530
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
531 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
532
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
533 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
534
7c5e5e97a3bc move static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16111
diff changeset
535 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
536
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
537 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
538
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
539 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
540
16118
f8e463523229 move more static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
541 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
542
16129
053b0364b507 localize use of yy_fatal_error with lexical_feedback member function
John W. Eaton <jwe@octave.org>
parents: 16128
diff changeset
543 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
544
16229
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
545 void lexer_debug (const char *pattern);
16118
f8e463523229 move more static lexer helper functions to lexical_feedback class
John W. Eaton <jwe@octave.org>
parents: 16115
diff changeset
546
16149
49dfba4fd3c5 use pure parser and reentrant lexer interfaces
John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
547 // 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
548 void *scanner;
49dfba4fd3c5 use pure parser and reentrant lexer interfaces
John W. Eaton <jwe@octave.org>
parents: 16139
diff changeset
549
16183
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
550 // Object that reads and buffers input.
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
551 input_buffer input_buf;
359d56094efa handle lexer input buffering with class
John W. Eaton <jwe@octave.org>
parents: 16164
diff changeset
552
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
553 octave_input_reader input_reader;
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
554
16209
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
555 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
556
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
557 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
558
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
559 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
560
e7ff32e7cf82 move global promptflag variable to octave_reader class
John W. Eaton <jwe@octave.org>
parents: 16207
diff changeset
561 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
562
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
563 std::string input_source (void) const
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
564 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
565 return input_reader.input_source ();
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
566 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
567
16203
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
568 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
569 {
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
570 return input_source () == "terminal";
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
571 }
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
572
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
573 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
574 {
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
575 return input_source () == "file";
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
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576 }
127cccb037bf move more global parser and lexer variables to classes
John W. Eaton <jwe@octave.org>
parents: 16199
diff changeset
577
16195
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
578 bool input_from_eval_string (void) const
b52d2f9294b6 use class for reading lexer input
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parents: 16194
diff changeset
579 {
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
580 return input_source () == "eval_string";
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
581 }
b52d2f9294b6 use class for reading lexer input
John W. Eaton <jwe@octave.org>
parents: 16194
diff changeset
582
16224
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
583 void push_start_state (int state);
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
584
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
585 void pop_start_state (void);
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
586
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
587 void clear_start_state (void);
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
588
4a848eb52de2 use stack for tracking lexer start states
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parents: 16209
diff changeset
589 int start_state (void) const { return start_state_stack.top (); }
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
590
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
591 void display_start_state (void) const;
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
592
16229
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
593 int handle_op (const char *pattern, int tok, bool convert = false,
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
594 bool bos = false, bool qit = false);
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
595
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
596 int handle_incompatible_op (const char *pattern, int tok,
7b7b1e4968e8 use functions instead of token return macros in lexer
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parents: 16228
diff changeset
597 bool convert = false, bool bos = false,
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
598 bool qit = false);
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
599
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
600 int handle_op_internal (const char *pattern, int tok, bool convert,
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
601 bool bos, bool qit, bool compat);
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
602
16231
2b15ae55c721 put all tokens in the token cache
John W. Eaton <jwe@octave.org>
parents: 16230
diff changeset
603 int handle_token (const std::string& name, int tok);
16229
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
604
16231
2b15ae55c721 put all tokens in the token cache
John W. Eaton <jwe@octave.org>
parents: 16230
diff changeset
605 int handle_token (int tok, token *tok_val = 0);
16229
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
606
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
607 int count_token (int tok);
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
608
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
609 int show_token (int tok);
7b7b1e4968e8 use functions instead of token return macros in lexer
John W. Eaton <jwe@octave.org>
parents: 16228
diff changeset
610
16126
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
611 // For unwind protect.
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
612 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
613
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
614 private:
5c885c13bfa3 localize use of yylval.tok_val in lexical_feedback member functions
John W. Eaton <jwe@octave.org>
parents: 16125
diff changeset
615
16224
4a848eb52de2 use stack for tracking lexer start states
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parents: 16209
diff changeset
616 std::stack<int> start_state_stack;
4a848eb52de2 use stack for tracking lexer start states
John W. Eaton <jwe@octave.org>
parents: 16209
diff changeset
617
16110
7302f8a4df83 use pointer for global lexical_feedback structure
John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
618 // No copying!
7302f8a4df83 use pointer for global lexical_feedback structure
John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
619
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
620 octave_lexer (const octave_lexer&);
16110
7302f8a4df83 use pointer for global lexical_feedback structure
John W. Eaton <jwe@octave.org>
parents: 16107
diff changeset
621
16158
7eb614760ddb rename lexical_feedback to octave_lexer
John W. Eaton <jwe@octave.org>
parents: 16149
diff changeset
622 octave_lexer& operator = (const octave_lexer&);
1826
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
623 };
b14829582cc4 [project @ 1996-02-02 03:05:07 by jwe]
jwe
parents: 1315
diff changeset
624
1
78fd87e624cb [project @ 1993-08-08 01:13:40 by jwe]
jwe
parents:
diff changeset
625 #endif