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[mq]: graphics_text_engine
author Michael Goffioul <michael.goffioul@gmail.com>
date Fri, 26 Jun 2009 21:12:09 +0100
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children f3b65e1ae355
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9403
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1 /*
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2
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3 Copyright (C) 2009 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 #if ! defined (txt_eng_h)
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24 #define txt_eng_h 1
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25
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26 #include "base-list.h"
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27
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28 class text_element;
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29 class text_element_string;
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30 class text_element_list;
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31 class text_subscript_element;
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32 class text_superscript_element;
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33
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34 class text_processor;
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35
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36 class
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37 OCTINTERP_API
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38 text_element
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39 {
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40 public:
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41 text_element (void) { }
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42
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43 virtual ~text_element (void) { }
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44
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45 virtual void accept (text_processor& p) = 0;
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46
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47 private:
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48 text_element (const text_element&);
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49 };
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50
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51 class
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52 OCTINTERP_API
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53 text_element_string : public text_element
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54 {
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55 public:
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56 text_element_string (const std::string& s = "")
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57 : text_element (), str (s) { }
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58
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59 ~text_element_string (void) { }
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60
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61 std::string string_value (void) const { return str; }
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62
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63 void accept (text_processor& p);
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64
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65 private:
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66 std::string str;
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67
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68 private:
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69 text_element_string (const text_element_string &);
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70 };
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71
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72 class
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73 OCTINTERP_API
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74 text_element_list :
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75 public text_element,
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76 public octave_base_list<text_element *>
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77 {
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78 public:
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79 text_element_list (void)
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80 : text_element (), octave_base_list<text_element*> () { }
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81
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82 ~text_element_list (void)
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83 {
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84 while (! empty ())
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85 {
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86 iterator it = begin ();
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87 delete (*it);
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88 erase (it);
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89 }
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90 }
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91
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92 void accept (text_processor& p);
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93 };
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94
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95 class
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96 OCTINTERP_API
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97 text_subscript_element : public text_element_list
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98 {
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99 public:
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100 text_subscript_element (void)
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101 : text_element_list () { }
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102
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103 ~text_subscript_element (void) { }
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104
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105 void accept (text_processor& p);
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106 };
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107
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108 class
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109 OCTINTERP_API
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110 text_superscript_element : public text_element_list
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111 {
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112 public:
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113 text_superscript_element (void)
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114 : text_element_list () { }
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115
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116 ~text_superscript_element (void) { }
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117
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118 void accept (text_processor& p);
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119 };
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120
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121 class
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122 OCTINTERP_API
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123 text_processor
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124 {
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125 public:
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126 virtual void visit (text_element_string& e) = 0;
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127
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128 virtual void visit (text_element_list& e)
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129 {
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130 for (text_element_list::iterator it = e.begin ();
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131 it != e.end (); ++it)
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132 {
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133 (*it)->accept (*this);
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134 }
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135 }
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136
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137 virtual void visit (text_subscript_element& e)
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138 { visit (dynamic_cast<text_element_list&> (e)); }
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139
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140 virtual void visit (text_superscript_element& e)
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141 { visit (dynamic_cast<text_element_list&> (e)); }
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142
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143 virtual void reset (void) { }
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144
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145 protected:
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146 text_processor (void) { }
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147
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148 virtual ~text_processor (void) { }
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149 };
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150
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151 #define TEXT_ELEMENT_ACCEPT(cls) \
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152 inline void \
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153 cls::accept (text_processor& p) \
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154 { p.visit (*this); }
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155
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156 TEXT_ELEMENT_ACCEPT(text_element_string)
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157 TEXT_ELEMENT_ACCEPT(text_element_list)
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158 TEXT_ELEMENT_ACCEPT(text_subscript_element)
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159 TEXT_ELEMENT_ACCEPT(text_superscript_element)
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160
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161 class
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162 OCTINTERP_API
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163 text_parser
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164 {
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165 public:
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166 text_parser (void) { }
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167
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168 virtual ~text_parser (void) { }
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169
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170 virtual text_element* parse (const std::string& s) = 0;
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171 };
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172
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173 class
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174 OCTINTERP_API
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175 text_parser_none : public text_parser
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176 {
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177 public:
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178 text_parser_none (void) : text_parser () { }
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179
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180 ~text_parser_none (void) { }
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181
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182 text_element* parse (const std::string& s)
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183 {
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184 return new text_element_string (s);
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185 }
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186 };
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187
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188 #endif