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annotate libinterp/corefcn/text-engine.h @ 29359:7854d5752dd2

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maint: merge stable to default.
author John W. Eaton <jwe@octave.org>
date Wed, 10 Feb 2021 10:10:40 -0500
parents 376ca9022b7e 0a5b15007766
children 2ae4764180c6
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2009-2021 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 #if ! defined (octave_text_engine_h)
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27 #define octave_text_engine_h 1
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28
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29 #include "octave-config.h"
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30
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31 #include <memory>
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32 #include <string>
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33
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34 #include "base-list.h"
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35 #include "caseless-str.h"
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36 #include "dMatrix.h"
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37
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38 namespace octave
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39 {
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40 class text_element;
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41 class text_element_string;
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42 class text_element_symbol;
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43 class text_element_list;
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44 class text_element_subscript;
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45 class text_element_superscript;
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46 class text_element_combined;
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47 class text_element_fontname;
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48 class text_element_fontsize;
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49 class text_element_fontstyle;
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50 class text_element_color;
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51
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52 class text_processor;
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53
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54 class
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55 OCTINTERP_API
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56 text_element
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57 {
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58 public:
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59 text_element (void) { }
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60
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61 virtual ~text_element (void) = default;
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62
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63 virtual void accept (text_processor& p) = 0;
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64
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65 private:
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66 text_element (const text_element&);
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67 };
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68
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69 class
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70 OCTINTERP_API
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71 text_element_string : public text_element
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72 {
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73 public:
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74 text_element_string (const std::string& s = "")
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75 : text_element (), str (s) { }
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76
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77 ~text_element_string (void) = default;
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79 std::string string_value (void) const { return str; }
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80
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81 void accept (text_processor& p);
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82
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83 private:
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84 std::string str;
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85
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86 private:
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87 text_element_string (const text_element_string &);
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88 };
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89
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90 class
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91 OCTINTERP_API
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92 text_element_symbol : public text_element
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93 {
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94 public:
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95 enum { invalid_code = 0xFFFFFFFFU };
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96
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97 public:
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98 text_element_symbol (int sym)
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99 : text_element (), symbol (sym) { }
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100
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101 ~text_element_symbol (void) = default;
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102
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103 int get_symbol (void) const { return symbol; }
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104
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105 uint32_t get_symbol_code (void) const;
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106
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107 void accept (text_processor& p);
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108
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109 private:
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110 int symbol;
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111 };
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112
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113 class
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114 OCTINTERP_API
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115 text_element_list
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116 : public text_element, public base_list<text_element *>
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117 {
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118 public:
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119 text_element_list (void)
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120 : text_element (), base_list<text_element*> () { }
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121
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122 text_element_list (text_element *e)
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123 : text_element (), base_list<text_element*> ()
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124 {
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125 push_back (e);
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126 }
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127
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128 ~text_element_list (void)
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129 {
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130 while (! empty ())
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131 {
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132 auto it = begin ();
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133 delete (*it);
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134 erase (it);
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135 }
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136 }
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137
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138 void accept (text_processor& p);
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139 };
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140
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141 class
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142 OCTINTERP_API
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143 text_element_subscript : public text_element
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144 {
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145 public:
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146 text_element_subscript (text_element *e)
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147 : text_element (), elem (e) { }
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148
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149 text_element_subscript (char c)
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150 : text_element ()
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151 { elem = new text_element_string (std::string (1, c)); }
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152
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153 ~text_element_subscript (void)
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154 { delete elem; }
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155
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156 void accept (text_processor& p);
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157
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158 text_element * get_element (void) { return elem; }
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159
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160 private:
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161 text_element *elem;
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162
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163 private:
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164 text_element_subscript (void);
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165 };
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166
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167 class
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168 OCTINTERP_API
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169 text_element_superscript : public text_element
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170 {
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171 public:
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172 text_element_superscript (text_element *e)
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173 : text_element (), elem (e) { }
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174
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175 text_element_superscript (char c)
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176 : text_element ()
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177 { elem = new text_element_string (std::string (1, c)); }
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178
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179 ~text_element_superscript (void)
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180 { delete elem; }
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181
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182 void accept (text_processor& p);
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183
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184 text_element * get_element (void) { return elem; }
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185
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186 private:
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187 text_element *elem;
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188
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189 private:
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190 text_element_superscript (void);
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191 };
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192
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193 class
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194 OCTINTERP_API
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195 text_element_combined : public text_element_list
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196 {
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197 public:
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198 text_element_combined (text_element *e)
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199 : text_element_list (e) { }
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200
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201 text_element_combined (text_element *e1, text_element *e2)
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202 : text_element_list(e1)
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203 { push_back (e2); }
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204
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205 void accept (text_processor& p);
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206 };
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207
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208 class
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209 OCTINTERP_API
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210 text_element_fontstyle : public text_element
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211 {
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212 public:
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213 enum fontstyle
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214 {
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215 normal,
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216 bold,
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217 italic,
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218 oblique
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219 };
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220
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221 text_element_fontstyle (fontstyle st)
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222 : text_element (), style (st) { }
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223
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224 ~text_element_fontstyle (void) = default;
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225
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226 fontstyle get_fontstyle (void) const { return style; }
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227
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228 void accept (text_processor& p);
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229
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230 private:
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231 fontstyle style;
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232
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233 private:
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234 text_element_fontstyle (void);
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235 };
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236
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237 class
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238 OCTINTERP_API
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239 text_element_fontname : public text_element
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240 {
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241 public:
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242 text_element_fontname (const std::string& fname)
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243 : text_element (), name (fname) { }
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244
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245 ~text_element_fontname (void) = default;
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246
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247 const std::string& get_fontname (void) const { return name; }
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248
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249 void accept (text_processor& p);
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250
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251 private:
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252 std::string name;
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253
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254 private:
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255 text_element_fontname (void);
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256 };
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257
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258 class
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259 OCTINTERP_API
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260 text_element_fontsize : public text_element
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261 {
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262 public:
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263 text_element_fontsize (double fsize)
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264 : text_element (), size (fsize) { }
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265
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266 ~text_element_fontsize (void) = default;
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267
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268 double get_fontsize (void) const { return size; }
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269
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270 void accept (text_processor& p);
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271
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272 private:
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273 double size;
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274
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275 private:
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276 text_element_fontsize (void);
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277 };
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278
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279 class
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280 OCTINTERP_API
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281 text_element_color : public text_element
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282 {
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283 public:
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284 text_element_color (double r, double g, double b)
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285 : text_element (), rgb (1, 3, 0.0)
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286 {
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287 rgb(0) = r;
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288 rgb(1) = g;
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289 rgb(2) = b;
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290 }
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291
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292 text_element_color (const std::string& cname)
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293 : text_element (), rgb (1, 3, 0.0)
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294 {
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295 #define ASSIGN_COLOR(r,g,b) { rgb(0) = r; rgb(1) = g; rgb(2) = b; }
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296 if (cname == "red") ASSIGN_COLOR(1, 0, 0)
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297 else if (cname == "green") ASSIGN_COLOR(0, 1, 0)
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298 else if (cname == "yellow") ASSIGN_COLOR(1, 1, 0)
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299 else if (cname == "magenta") ASSIGN_COLOR(1, 0, 1)
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300 else if (cname == "blue") ASSIGN_COLOR(0, 0, 1)
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301 else if (cname == "black") ASSIGN_COLOR(0, 0, 0)
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302 else if (cname == "white") ASSIGN_COLOR(1, 1, 1)
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303 else if (cname == "gray") ASSIGN_COLOR(.5, .5, .5)
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304 else if (cname == "darkGreen") ASSIGN_COLOR(0, .5, 0)
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305 else if (cname == "orange") ASSIGN_COLOR(1, .65, 0)
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306 else if (cname == "lightBlue") ASSIGN_COLOR(0.68, .85, .9)
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307 #undef ASSIGN_COLOR
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308 }
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309
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310 ~text_element_color (void) = default;
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311
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312 Matrix get_color (void) { return rgb; }
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313
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314 void accept (text_processor& p);
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315
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316 private:
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317 Matrix rgb;
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318 };
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319
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320 class
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321 OCTINTERP_API
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322 text_processor
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323 {
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324 public:
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325 virtual void visit (text_element_string& e) = 0;
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326
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327 virtual void visit (text_element_symbol&) { }
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328
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329 virtual void visit (text_element_list& e)
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330 {
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331 for (auto& el_p : e)
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332 {
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333 el_p->accept (*this);
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334 }
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335 }
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336
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337 virtual void visit (text_element_subscript& e)
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338 { e.get_element ()->accept (*this); }
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339
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340 virtual void visit (text_element_superscript& e)
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341 { e.get_element ()->accept (*this); }
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342
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343 virtual void visit (text_element_combined&) { }
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344
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345 virtual void visit (text_element_fontstyle&) { }
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346
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347 virtual void visit (text_element_fontname&) { }
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348
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349 virtual void visit (text_element_fontsize&) { }
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350
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351 virtual void visit (text_element_color&) { }
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352
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353 virtual void reset (void) { }
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354
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355 protected:
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356 text_processor (void) { }
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357
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358 virtual ~text_processor (void) = default;
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359 };
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360
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361 #define TEXT_ELEMENT_ACCEPT(cls) \
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362 inline void \
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363 cls::accept (text_processor& p) \
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364 { \
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365 p.visit (*this); \
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366 }
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367
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368 TEXT_ELEMENT_ACCEPT(text_element_string)
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369 TEXT_ELEMENT_ACCEPT(text_element_symbol)
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370 TEXT_ELEMENT_ACCEPT(text_element_list)
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371 TEXT_ELEMENT_ACCEPT(text_element_subscript)
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372 TEXT_ELEMENT_ACCEPT(text_element_superscript)
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373 TEXT_ELEMENT_ACCEPT(text_element_combined)
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374 TEXT_ELEMENT_ACCEPT(text_element_fontstyle)
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375 TEXT_ELEMENT_ACCEPT(text_element_fontname)
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376 TEXT_ELEMENT_ACCEPT(text_element_fontsize)
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377 TEXT_ELEMENT_ACCEPT(text_element_color)
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378
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379 class
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380 OCTINTERP_API
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381 text_parser
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382 {
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383 public:
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384 text_parser (void) { }
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385
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386 virtual ~text_parser (void) = default;
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387
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388 virtual text_element * parse (const std::string& s) = 0;
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389
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390 public:
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391 static text_element * parse (const std::string& s,
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392 const caseless_str& interpreter);
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393 };
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394
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395 class
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396 OCTINTERP_API
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397 text_parser_none : public text_parser
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398 {
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399 public:
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400 text_parser_none (void) : text_parser () { }
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401
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402 ~text_parser_none (void) = default;
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403
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404 // FIXME: is it possible to use reference counting to manage the
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405 // memory for the object returned by the text parser? That would be
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406 // preferable to having to know when and where to delete the object it
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407 // creates...
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408
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409 text_element * parse (const std::string& s)
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410 {
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411 return new text_element_string (s);
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412 }
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413 };
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414
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415 class
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416 OCTINTERP_API
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417 text_parser_tex : public text_parser
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418 {
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419 public:
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420 text_parser_tex (void)
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421 : text_parser (), scanner (nullptr), buffer_state (nullptr), result (nullptr)
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422 { }
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423
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424 ~text_parser_tex (void)
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425 { destroy_lexer (); }
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426
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427 text_element * parse (const std::string& s);
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428
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429 void * get_scanner (void) { return scanner; }
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430
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431 void set_parse_result (text_element *e) { result = e; }
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432
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433 text_element * get_parse_result (void) { return result; }
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434
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435 private:
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436 bool init_lexer (const std::string& s);
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437
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438 void destroy_lexer (void);
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439
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440 private:
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441 void *scanner;
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442
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443 void *buffer_state;
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444
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445 text_element *result;
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446 };
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447
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448 inline text_element*
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449 text_parser::parse (const std::string& s, const caseless_str& interpreter)
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450 {
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451 std::unique_ptr<text_parser> parser;
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452
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453 if (interpreter.compare ("tex"))
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454 parser.reset (new text_parser_tex ());
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455 else
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456 parser.reset (new text_parser_none ());
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457
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458 return parser->parse (s);
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459 }
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460 }
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461
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462 #endif