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annotate libinterp/corefcn/oct-tex-parser.yy @ 17276:f052d7ccb7dc

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Allow empty TeX list {} * libinterp/corefcn/oct-tex-parser.yy (scoped_element_list): Allow empty list, as {}.
author Michael Goffioul <michael.goffioul@gmail.com>
date Sun, 18 Aug 2013 21:49:59 -0400
parents 8201f78a0064
children fe6518a1d87c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2
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3 Copyright (C) 2013 Michael Goffioul
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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.
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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 %{
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24 #define YYDEBUG 1
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25
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26 #ifdef HAVE_CONFIG_H
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27 #include <config.h>
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28 #endif
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29
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30 #include "txt-eng.h"
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31 #include "oct-tex-parser.h"
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32
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33 extern int octave_tex_lex (YYSTYPE *, void *);
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34 static void yyerror (text_parser_tex& parser, const char *s);
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35
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36 #define scanner parser.get_scanner ()
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37 %}
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38
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39 %name-prefix="octave_tex_"
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40 %define api.pure
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41 %parse-param { text_parser_tex& parser }
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42 %lex-param { void *scanner }
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43
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44 %code requires {#include <string>}
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45
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46 %union {
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47 /* Leaf symbols produced by the scanner */
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48 char ch;
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49 double num;
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50
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51 /* Used for string buffering */
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52 std::string* str;
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53
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54 /* Objects produced by the parser */
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55 text_element* e_base;
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56 text_element_list* e_list;
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57 }
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58
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59 %token BF IT SL RM CMD
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60 %token FONTNAME FONTSIZE
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61 %token COLOR COLOR_RGB
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62 %token START END SUPER SUB
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63 %token<ch> CH ID
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64 %token<num> NUM
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65
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66 %type<str> simple_string identifier
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67 %type<e_base> string_element symbol_element
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68 %type<e_base> superscript_element subscript_element combined_script_element
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69 %type<e_base> font_modifier_element fontname_element fontsize_element color_element
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70 %type<e_list> string_element_list scoped_string_element_list
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71
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72 /* Make sure there's no memory leak on parse error. */
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73 %destructor { } <ch> <num>
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74 %destructor { delete $$; } <*>
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75
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76 %nonassoc SCRIPT
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77 %nonassoc SUB SUPER
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78
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79 %nonassoc STR
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80 %nonassoc CH
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81
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82 %start string
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83
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84 %%
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85
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86 simple_string : CH
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87 { $$ = new std::string (1, $1); }
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88 | simple_string CH
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89 { $1->append (1, $2); $$ = $1; }
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90 ;
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91
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92 identifier : ID
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93 { $$ = new std::string (1, $1); }
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94 | identifier ID
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95 { $1->append (1, $2); $$ = $1; }
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96 ;
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97
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98 symbol_element : CMD identifier
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99 {
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100 $$ = new text_element_symbol (*$2);
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101 delete $2;
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102 }
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103 ;
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104
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105 font_modifier_element : BF
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106 { $$ = new text_element_fontstyle (text_element_fontstyle::bold); }
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107 | IT
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108 { $$ = new text_element_fontstyle (text_element_fontstyle::italic); }
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109 | SL
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110 { $$ = new text_element_fontstyle (text_element_fontstyle::oblique); }
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111 | RM
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112 { $$ = new text_element_fontstyle (text_element_fontstyle::normal); }
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113 ;
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114
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115 fontsize_element : FONTSIZE START NUM END
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116 { $$ = new text_element_fontsize ($3); }
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117 ;
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118
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119 fontname_element : FONTNAME START simple_string END
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120 {
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121 $$ = new text_element_fontname (*$3);
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122 delete $3;
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123 }
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124 ;
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125
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126 color_element : COLOR START simple_string END
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127 {
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128 $$ = new text_element_color (*$3);
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129 delete $3;
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130 }
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131 | COLOR_RGB START NUM NUM NUM END
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132 {
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133 $$ = new text_element_color ($3, $4, $5);
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134 }
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135 ;
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136
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137 string_element : simple_string %prec STR
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138 {
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139 $$ = new text_element_string (*$1);
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140 delete $1;
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141 }
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142 | scoped_string_element_list
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143 /* This is just to avoid a warning in bison. */
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144 { $$ = $1; }
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145 | symbol_element
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146 | font_modifier_element
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147 | fontsize_element
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148 | fontname_element
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149 | color_element
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150 | superscript_element %prec SCRIPT
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151 | subscript_element %prec SCRIPT
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152 | combined_script_element
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153 ;
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154
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155 superscript_element : SUPER CH
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156 { $$ = new text_element_superscript ($2); }
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157 | SUPER scoped_string_element_list
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158 { $$ = new text_element_superscript ($2); }
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159 | SUPER symbol_element
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160 { $$ = new text_element_superscript ($2); }
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161 ;
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162
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163 subscript_element : SUB CH
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164 { $$ = new text_element_subscript ($2); }
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165 | SUB scoped_string_element_list
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166 { $$ = new text_element_subscript ($2); }
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167 | SUB symbol_element
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168 { $$ = new text_element_subscript ($2); }
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169 ;
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170
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171 combined_script_element : subscript_element superscript_element
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172 { $$ = new text_element_combined ($1, $2); }
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173 | superscript_element subscript_element
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174 { $$ = new text_element_combined ($1, $2); }
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175 ;
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176
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177 string_element_list : string_element
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178 { $$ = new text_element_list ($1); }
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179 | string_element_list string_element
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180 { $1->push_back ($2); $$ = $1; }
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181 ;
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182
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183 scoped_string_element_list : START string_element_list END
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184 { $$ = $2; }
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185 | START END
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186 { $$ = new text_element_list (); }
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187 ;
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188
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189 string : /* empty */
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190 { parser.set_parse_result (new text_element_string ("")); }
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191 | string_element_list
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192 { parser.set_parse_result ($1); }
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193 ;
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194
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195 %%
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196
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197 text_element*
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198 text_parser_tex::parse (const std::string& s)
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199 {
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200 octave_tex_debug = 0;
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201
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202 if (init_lexer (s))
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203 {
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204 result = 0;
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205
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206 if (octave_tex_parse (*this) == 0)
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207 return result;
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208 }
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209
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210 return new text_element_string (s);
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211 }
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212
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213 static void
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214 yyerror (text_parser_tex&, const char *s)
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215 {
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216 fprintf (stderr, "TeX parse error: %s\n", s);
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217 }