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annotate libinterp/corefcn/oct-tex-parser.yy @ 33623:4517f929c59d bytecode-interpreter tip

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maint: Merge default to bytecode-interpreter
author Arun Giridhar <arungiridhar@gmail.com>
date Fri, 24 May 2024 16:22:41 -0400
parents 2e484f9f1f18
children
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2013-2024 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 %{
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27
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28 #define YYDEBUG 1
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29
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30 #if defined (HAVE_CONFIG_H)
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31 # include "config.h"
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32 #endif
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33
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34 #include "text-engine.h"
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35
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36 // oct-tex-parser.h must be included after text-engine.h
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37 #include "oct-tex-parser.h"
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38
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39 extern int octave_tex_lex (YYSTYPE *, void *);
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40 static void yyerror (octave::text_parser_tex& parser, const char *s);
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41
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42 #define m_scanner parser.get_scanner ()
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43 #define yyalloc octave_tex_yyalloc
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44
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45 #if defined (HAVE_PRAGMA_GCC_DIAGNOSTIC)
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46 // Disable this warning for code that is generated by Bison,
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47 // including grammar rules. Push the current state so we can
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48 // restore the warning state prior to functions we define at
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49 // the bottom of the file.
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50 # pragma GCC diagnostic push
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51 # pragma GCC diagnostic ignored "-Wold-style-cast"
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52 #endif
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53
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54 %}
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55
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56 %define api.pure
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57 // No spaces inside the braces for the prefix definition!
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58 %define api.prefix {octave_tex_}
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59 %parse-param { octave::text_parser_tex& parser }
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60 %lex-param { void *m_scanner }
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61
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62 %code requires {#include <string>}
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63
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64 %union
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65 {
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66 // Leaf symbols produced by the scanner.
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67 char ch;
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68 double num;
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69 int sym;
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70
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71 // Used for string buffering.
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72 std::string *str;
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73
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74 // Objects produced by the parser.
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75 octave::text_element *e_base;
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76 octave::text_element_list *e_list;
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77 }
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78
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79 %token BF IT SL RM
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80 %token FONTNAME FONTSIZE
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81 %token COLOR COLOR_RGB
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82 %token START END SUPER SUB
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83 %token<ch> CH
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84 %token<num> NUM
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85 %token<sym> SYM
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86
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87 %type<str> simple_string
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88 %type<e_base> string_element symbol_element
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89 %type<e_base> superscript_element subscript_element combined_script_element
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90 %type<e_base> font_modifier_element fontname_element fontsize_element
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91 %type<e_base> color_element
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92 %type<e_list> string_element_list scoped_string_element_list
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93
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94 // Make sure there's no memory leak on parse error.
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95 %destructor { } <ch> <num> <sym>
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96 %destructor { delete $$; } <*>
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97
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98 %nonassoc SCRIPT
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99 %nonassoc SUB SUPER
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100
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101 %nonassoc STR
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102 %nonassoc CH
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103
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104 %start string
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105
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106 %%
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107
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108 simple_string : CH
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109 { $$ = new std::string (1, $1); }
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110 | simple_string CH
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111 { $1->append (1, $2); $$ = $1; }
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112 ;
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113
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114 symbol_element : SYM
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115 { $$ = new octave::text_element_symbol ($1); }
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116 ;
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117
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118 font_modifier_element : BF
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119 { $$ = new octave::text_element_fontstyle (octave::text_element_fontstyle::bold); }
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120 | IT
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121 { $$ = new octave::text_element_fontstyle (octave::text_element_fontstyle::italic); }
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122 | SL
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123 { $$ = new octave::text_element_fontstyle (octave::text_element_fontstyle::oblique); }
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124 | RM
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125 { $$ = new octave::text_element_fontstyle (octave::text_element_fontstyle::normal); }
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126 ;
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127
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128 fontsize_element : FONTSIZE START NUM END
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129 { $$ = new octave::text_element_fontsize ($3); }
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130 ;
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131
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132 fontname_element : FONTNAME START simple_string END
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133 {
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134 $$ = new octave::text_element_fontname (*$3);
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135 delete $3;
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136 }
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137 ;
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138
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139 color_element : COLOR START simple_string END
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140 {
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141 $$ = new octave::text_element_color (*$3);
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142 delete $3;
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143 }
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144 | COLOR_RGB START NUM NUM NUM END
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145 {
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146 $$ = new octave::text_element_color ($3, $4, $5);
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147 }
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148 ;
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149
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150 string_element : simple_string %prec STR
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151 {
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152 $$ = new octave::text_element_string (*$1);
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153 delete $1;
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154 }
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155 | scoped_string_element_list
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156 { $$ = $1; }
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157 | symbol_element
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158 | font_modifier_element
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159 | fontsize_element
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160 | fontname_element
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161 | color_element
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162 | superscript_element %prec SCRIPT
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163 | subscript_element %prec SCRIPT
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164 | combined_script_element
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165 ;
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166
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167 superscript_element : SUPER CH
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168 { $$ = new octave::text_element_superscript ($2); }
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169 | SUPER scoped_string_element_list
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170 { $$ = new octave::text_element_superscript ($2); }
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171 | SUPER symbol_element
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172 { $$ = new octave::text_element_superscript ($2); }
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173 ;
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174
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175 subscript_element : SUB CH
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176 { $$ = new octave::text_element_subscript ($2); }
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177 | SUB scoped_string_element_list
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178 { $$ = new octave::text_element_subscript ($2); }
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179 | SUB symbol_element
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180 { $$ = new octave::text_element_subscript ($2); }
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181 ;
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182
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183 combined_script_element : subscript_element superscript_element
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184 { $$ = new octave::text_element_combined ($1, $2); }
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185 | superscript_element subscript_element
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186 { $$ = new octave::text_element_combined ($1, $2); }
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187 ;
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188
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189 string_element_list : string_element
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190 { $$ = new octave::text_element_list ($1); }
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191 | string_element_list string_element
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192 { $1->push_back ($2); $$ = $1; }
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193 ;
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194
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195 scoped_string_element_list
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196 : START string_element_list END
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197 { $$ = $2; }
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198 | START END
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199 { $$ = new octave::text_element_list (); }
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200 ;
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201
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202 string : // empty
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203 { parser.set_parse_result (new octave::text_element_string ("")); }
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204 | string_element_list
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205 { parser.set_parse_result ($1); }
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206 ;
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207
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208 %%
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209
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210 #if defined (HAVE_PRAGMA_GCC_DIAGNOSTIC)
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211 // Restore prevailing warning state for remainder of the file.
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212 # pragma GCC diagnostic pop
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213 #endif
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214
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215 OCTAVE_BEGIN_NAMESPACE(octave)
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216
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217 text_element*
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218 text_parser_tex::parse (const std::string& s)
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219 {
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220 octave_tex_debug = 0;
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221
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222 if (init_lexer (s))
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223 {
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224 m_result = nullptr;
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225
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226 if (octave_tex_parse (*this) == 0)
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227 return m_result;
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228 }
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229
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230 return new text_element_string (s);
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231 }
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232
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233 OCTAVE_END_NAMESPACE(octave)
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234
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235 static void
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236 yyerror (octave::text_parser_tex&, const char *s)
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237 {
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238 fprintf (stderr, "TeX parse error: %s\n", s);
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239 }