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annotate libinterp/corefcn/oct-tex-parser.yy @ 17327:fe6518a1d87c

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Move TeX symbol decoding into the lexer (bug #39831). * libinterp/Makefile.am (BUILT_SOURCES): Add corefcn/oct-tex-symbols.cc. (BUILT_DISTFILES): Add corefcn/oct-tex-lexer.ll and corefcn/oct-tex-symbols.cc. (EXTRA_DIST): Add corefcn/oct-tex-lexer.in.ll and corefcn/oct-tex-symbols.in. (ULT_DIST_SRC): Filter out corefcn/oct-tex-lexer.ll from DIST_SRC and add corefcn/oct-tex-lexer.in.ll instead. (CLEAN_FILES): Add corefcn/oct-tex-parser.output. * libinterp/corefcn/modules.mk (corefcn/oct-tex-lexer.ll, corefcn/oct-tex-symbols.cc): New rules to build the TeX lexer. (corefcn/txt-eng.cc): Add dependency on corefcn/oct-tex-symbols.cc. * libinterp/corefcn/oct-tex-lexer.in.ll: Renamed from oct-tex.lexer.ll. Remove COMMAND state. Remove ID regex. Replace rules for symbols with tag @SYMBOL_RULES@. * libinterp/corefcn/oct-tex-parser.yy (ID, CMD, identifier): Remove tokens. (SYM, sym): New token and value. (symbol_element): Build from SYM. * libinterp/corefcn/oct-tex-symbols.in: New file with supported TeX symbols and corresponding codes (unicode and MS symbols). * libinterp/corefcn/txt-eng.h (class text_element_symbol): Make it inherit from text_element. (text_element_symbol::code): Removed member. (text_element_symbol::symbol): New member. (text_element_symbol::text_element_symbol): Adapt constructor. (text_element_symbol::get_symbol): New method. (text_element_symbol::get_symbol_code): Make const. * libinterp/corefcn/txt-eng.cc (symbol_names, symbol_codes): Remove static variables, now auto-generated from oct-tex-symbols.in. (oct-tex-symbols.cc): New include. (text_element_symbol::get_symbol_code): Change implementation to simply index into auto-generated symbol_codes array. * libinterp/corefcn/txt-eng-ft.cc (ft_render::visit(text_element_symbol)): Don't use text_element_symbol::string_value(), use text_element_symbol::get_symbol() instead.
author Michael Goffioul <michael.goffioul@gmail.com>
date Sat, 24 Aug 2013 14:27:09 -0400
parents f052d7ccb7dc
children bdbf91c0a1a4
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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 int sym;
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51
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52 /* Used for string buffering */
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53 std::string* str;
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54
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55 /* Objects produced by the parser */
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56 text_element* e_base;
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57 text_element_list* e_list;
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58 }
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59
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60 %token BF IT SL RM
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61 %token FONTNAME FONTSIZE
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62 %token COLOR COLOR_RGB
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63 %token START END SUPER SUB
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64 %token<ch> CH
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65 %token<num> NUM
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66 %token<sym> SYM
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67
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68 %type<str> simple_string
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69 %type<e_base> string_element symbol_element
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70 %type<e_base> superscript_element subscript_element combined_script_element
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71 %type<e_base> font_modifier_element fontname_element fontsize_element color_element
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72 %type<e_list> string_element_list scoped_string_element_list
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73
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74 /* Make sure there's no memory leak on parse error. */
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75 %destructor { } <ch> <num> <sym>
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76 %destructor { delete $$; } <*>
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77
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78 %nonassoc SCRIPT
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79 %nonassoc SUB SUPER
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80
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81 %nonassoc STR
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82 %nonassoc CH
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83
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84 %start string
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85
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86 %%
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87
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88 simple_string : CH
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89 { $$ = new std::string (1, $1); }
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90 | simple_string CH
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91 { $1->append (1, $2); $$ = $1; }
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92 ;
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93
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94 symbol_element : SYM
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95 { $$ = new text_element_symbol ($1); }
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96 ;
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97
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98 font_modifier_element : BF
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99 { $$ = new text_element_fontstyle (text_element_fontstyle::bold); }
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100 | IT
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101 { $$ = new text_element_fontstyle (text_element_fontstyle::italic); }
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102 | SL
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103 { $$ = new text_element_fontstyle (text_element_fontstyle::oblique); }
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104 | RM
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105 { $$ = new text_element_fontstyle (text_element_fontstyle::normal); }
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106 ;
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107
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108 fontsize_element : FONTSIZE START NUM END
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109 { $$ = new text_element_fontsize ($3); }
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110 ;
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111
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112 fontname_element : FONTNAME START simple_string END
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113 {
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114 $$ = new text_element_fontname (*$3);
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115 delete $3;
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116 }
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117 ;
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118
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119 color_element : COLOR START simple_string END
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120 {
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121 $$ = new text_element_color (*$3);
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122 delete $3;
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123 }
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124 | COLOR_RGB START NUM NUM NUM END
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125 {
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126 $$ = new text_element_color ($3, $4, $5);
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127 }
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128 ;
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129
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130 string_element : simple_string %prec STR
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131 {
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132 $$ = new text_element_string (*$1);
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133 delete $1;
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134 }
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135 | scoped_string_element_list
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136 /* This is just to avoid a warning in bison. */
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137 { $$ = $1; }
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138 | symbol_element
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139 | font_modifier_element
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140 | fontsize_element
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141 | fontname_element
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142 | color_element
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143 | superscript_element %prec SCRIPT
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144 | subscript_element %prec SCRIPT
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145 | combined_script_element
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146 ;
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147
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148 superscript_element : SUPER CH
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149 { $$ = new text_element_superscript ($2); }
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150 | SUPER scoped_string_element_list
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151 { $$ = new text_element_superscript ($2); }
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152 | SUPER symbol_element
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153 { $$ = new text_element_superscript ($2); }
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154 ;
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155
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156 subscript_element : SUB CH
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157 { $$ = new text_element_subscript ($2); }
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158 | SUB scoped_string_element_list
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159 { $$ = new text_element_subscript ($2); }
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160 | SUB symbol_element
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161 { $$ = new text_element_subscript ($2); }
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162 ;
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163
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164 combined_script_element : subscript_element superscript_element
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165 { $$ = new text_element_combined ($1, $2); }
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166 | superscript_element subscript_element
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167 { $$ = new text_element_combined ($1, $2); }
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168 ;
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169
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170 string_element_list : string_element
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171 { $$ = new text_element_list ($1); }
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172 | string_element_list string_element
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173 { $1->push_back ($2); $$ = $1; }
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174 ;
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175
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176 scoped_string_element_list : START string_element_list END
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177 { $$ = $2; }
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178 | START END
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179 { $$ = new text_element_list (); }
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180 ;
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181
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182 string : /* empty */
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183 { parser.set_parse_result (new text_element_string ("")); }
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184 | string_element_list
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185 { parser.set_parse_result ($1); }
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186 ;
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187
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188 %%
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189
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190 text_element*
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191 text_parser_tex::parse (const std::string& s)
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192 {
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193 octave_tex_debug = 0;
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194
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195 if (init_lexer (s))
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196 {
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197 result = 0;
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198
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199 if (octave_tex_parse (*this) == 0)
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200 return result;
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201 }
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202
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203 return new text_element_string (s);
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204 }
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205
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206 static void
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207 yyerror (text_parser_tex&, const char *s)
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208 {
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209 fprintf (stderr, "TeX parse error: %s\n", s);
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210 }