src/colors.cpp

Thu, 20 Jun 2019 08:54:35 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Thu, 20 Jun 2019 08:54:35 +0300
changeset 1440
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parent 1397
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permissions
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uuid things

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1 /*
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2 * LDForge: LDraw parts authoring CAD
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3 * Copyright (C) 2013 - 2018 Teemu Piippo
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4 *
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5 * This program is free software: you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation, either version 3 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #include <QDir>
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20 #include <QMessageBox>
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21 #include "colors.h"
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22 #include "main.h"
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23
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24 ColorData* LDColor::colorData = nullptr;
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25 const LDColor LDColor::nullColor {-1};
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26
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27 /*
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28 * Initializes the color information module.
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29 */
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30 void LDColor::initColors()
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31 {
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32 static ColorData colors;
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33 colors.loadFromLdconfig();
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34 LDColor::colorData = &colors;
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35 }
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36
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37 /*
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38 * Default-constructs an LDColor to 0(black).
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39 */
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40 LDColor::LDColor() :
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41 m_index {0} {}
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42
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43 /*
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44 * Constructs an LDColor by index.
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45 */
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46 LDColor::LDColor(qint32 index) :
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47 m_index {index} {}
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48
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49 /*
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50 * Returns whether or not the color is valid.
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51 */
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52 bool LDColor::isValid() const
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53 {
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54 if (isLDConfigColor() and data().name.isEmpty())
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55 return false; // Unknown LDConfig color
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56 else
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57 return m_index != -1;
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58 }
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59
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60 /*
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61 * Returns whether or not this color is defined in LDConfig.ldr.
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62 * This is false for e.g. direct colors.
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63 */
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64 bool LDColor::isLDConfigColor() const
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65 {
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66 return colorData->contains(index());
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67 }
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68
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69 /*
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70 * Returns the ColorData entry for this color.
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71 */
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72 const ColorData::Entry& LDColor::data() const
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73 {
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74 return colorData->get(index());
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75 }
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76
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77 /*
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78 * Returns the name of this color.
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79 */
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80 QString LDColor::name() const
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81 {
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82 if (isDirect())
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83 return "0x" + QString::number(index(), 16).toUpper();
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84 else if (isLDConfigColor())
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85 return data().name;
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86 else if (index() == -1)
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87 return "null color";
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88 else
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89 return "unknown";
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90 }
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91
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92 /*
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93 * Returns the hexadecimal code of this color.
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94 */
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95 QString LDColor::hexcode() const
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96 {
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97 return faceColor().name();
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98 }
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99
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100 /*
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101 * Returns the color used for surfaces.
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102 */
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103 QColor LDColor::faceColor() const
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104 {
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105 if (isDirect())
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106 {
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107 // Direct color -- compute from the index.
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108 QColor color;
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109 color.setRed((index() & 0x0FF0000) >> 16);
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110 color.setGreen((index() & 0x000FF00) >> 8);
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111 color.setBlue(index() & 0x00000FF);
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112
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113 if (index() >= 0x3000000)
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114 color.setAlpha(128);
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115
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116 return color;
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117 }
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118 else if (isLDConfigColor())
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119 {
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120 return data().faceColor;
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121 }
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122 else
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123 {
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124 return Qt::black;
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125 }
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126 }
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127
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128 /*
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129 * Returns the color used for edge lines.
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130 */
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131 QColor LDColor::edgeColor() const
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132 {
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133 if (isDirect())
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134 return luma(faceColor()) < 48 ? Qt::white : Qt::black;
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135 else if (isLDConfigColor())
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136 return data().edgeColor;
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137 else
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138 return Qt::black;
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139 }
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140
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141 /*
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142 * Returns the index number of this color.
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143 */
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144 qint32 LDColor::index() const
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145 {
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146 return m_index;
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147 }
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148
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149 /*
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150 * Returns a string containing the preferred representation of the index.
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151 */
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152 QString LDColor::indexString() const
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153 {
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154 if (isDirect())
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155 {
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156 // Use hexadecimal notation for direct colors.
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157 return "0x" + QString::number(index(), 16).toUpper();
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158 }
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159 else
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160 {
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161 return QString::number(index());
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162 }
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163 }
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164
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165 /*
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166 * Returns whether or not this color is a direct color.
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167 * Direct colors are picked by RGB value and are not defined in LDConfig.ldr.
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168 */
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169 bool LDColor::isDirect() const
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170 {
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171 return index() >= 0x02000000;
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172 }
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173
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174 /*
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175 * Returns the LDraw color index for a direct color.
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176 */
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177 LDColor LDColor::directColor(QColor color, bool transparent)
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178 {
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179 qint32 index = transparent ? 0x03000000 : 0x02000000;
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180 index |= color.red() << 16;
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181 index |= color.green() << 8;
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182 index |= color.blue();
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183 return LDColor {index};
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184 }
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185
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186 /*
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187 * LDColors are hashed by their index.
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188 */
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189 uint qHash(LDColor color)
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190 {
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191 return color.index();
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192 }
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193
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194 /*
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195 * Calculates the luma-value for the given color.
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196 * c.f. https://en.wikipedia.org/wiki/Luma_(video)
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197 */
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198 int luma(const QColor& color)
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199 {
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200 return static_cast<int>(round(0.2126 * color.red() + 0.7152 * color.green() + 0.0722 * color.blue()));
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201 }
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202
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203 /*
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204 * Constructs the color data array.
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205 */
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206 ColorData::ColorData()
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207 {
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208 // Initialize main and edge colors, they're special like that.
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209 m_data[MainColor.index()].faceColor = "#AAAAAA";
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210 m_data[MainColor.index()].edgeColor = Qt::black;
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211 m_data[MainColor.index()].name = "Main color";
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212 m_data[EdgeColor.index()].faceColor = Qt::black;
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213 m_data[EdgeColor.index()].edgeColor = Qt::black;
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214 m_data[EdgeColor.index()].name = "Edge color";
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215 }
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216
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217 /*
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218 * ColorData :: contains
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219 *
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220 * Returns whether or not the given color index is present in the array.
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221 */
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222 bool ColorData::contains(int code) const
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223 {
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224 return code >= 0 and code < countof(m_data);
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225 }
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226
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227 /*
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228 * Returns an entry in the color array.
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229 */
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230 const ColorData::Entry& ColorData::get(int code) const
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231 {
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232 if (not contains(code))
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233 throw std::runtime_error {"Attempted to get non-existant color information"};
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234
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235 return m_data[code];
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236 }
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237
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238 /*
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239 * Loads color information from LDConfig.ldr.
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240 */
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241 void ColorData::loadFromLdconfig()
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242 {
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243 *this = {};
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244
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245 for (const Library& library : config::libraries())
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246 {
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247 QDir dir {library.path};
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248
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249 if (dir.exists("LDConfig.ldr"))
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250 {
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251 QFile file {dir.filePath("LDConfig.ldr")};
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252
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253 if (file.open(QIODevice::ReadOnly))
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254 {
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255 this->loadFromFile(file);
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256 }
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257 else
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258 {
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259 QMessageBox::critical(
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260 nullptr,
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261 QObject::tr("Error"),
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262 format(
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263 QObject::tr("Unable to open LDConfig.ldr for parsing: %1"),
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264 file.errorString()
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265 )
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266 );
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267 }
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268 }
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269 }
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270 }
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271
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272 void ColorData::loadFromFile(QIODevice& device)
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273 {
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274 // TODO: maybe LDConfig can be loaded as a Document? Or would that be overkill?
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275 while (not device.atEnd())
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276 {
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277 QString line = QString::fromUtf8(device.readLine());
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278
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279 if (line.isEmpty() or line[0] != '0')
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280 continue; // empty or illogical
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281
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282 line.remove('\r');
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283 line.remove('\n');
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284
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285 // Parse the line
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286 LDConfigParser parser = {line};
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287 QString name;
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288 QString facename;
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289 QString edgename;
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290 QString codestring;
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291
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292 // Check 0 !COLOUR, parse the name
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293 if (not parser.compareToken(0, "0") or not parser.compareToken(1, "!COLOUR") or not parser.getToken(name, 2))
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294 continue;
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295
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296 // Replace underscores in the name with spaces for readability
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297 name.replace("_", " ");
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298
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299 if (not parser.parseTag("CODE", codestring))
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300 continue;
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301
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302 bool ok;
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303 int code = codestring.toShort(&ok);
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304
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305 if (not ok or not contains(code))
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306 continue;
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307
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308 if (not parser.parseTag("VALUE", facename) or not parser.parseTag("EDGE", edgename))
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309 continue;
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310
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311 // Ensure that our colors are correct
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312 QColor faceColor = {facename};
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313 QColor edgeColor = {edgename};
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314
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315 if (not faceColor.isValid() or not edgeColor.isValid())
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316 continue;
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317
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318 // Fill in the entry now.
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319 Entry& entry = m_data[code];
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320 entry.name = name;
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321 entry.faceColor = faceColor;
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322 entry.edgeColor = edgeColor;
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323
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324 // If the alpha tag is present, fill in that too.
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325 if (parser.parseTag("ALPHA", codestring))
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326 entry.faceColor.setAlpha(qBound(0, codestring.toInt(), 255));
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327 }
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328 }
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329
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330 /*
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331 * Constructs the LDConfig.ldr parser.
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332 */
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333 LDConfigParser::LDConfigParser(QString inputText)
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334 {
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335 m_tokens = inputText.split(' ', QString::SkipEmptyParts);
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336 }
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337
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338 /*
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339 * Returns whether or not there is a token at the given position.
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340 * If there is, fills in the value parameter with it.
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341 */
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342 bool LDConfigParser::getToken(QString& tokenText, int position)
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343 {
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344 if (position >= countof(m_tokens))
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345 {
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346 return false;
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347 }
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348 else
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349 {
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350 tokenText = m_tokens[position];
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351 return true;
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352 }
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353 }
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354
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355 /*
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356 * Attempts to find the provided token in the parsed LDConfig.ldr line.
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357 * If found, fills in the first parameter with the position of the token.
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358 *
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359 * The args parameter specifies how many arguments (i.e. following tokens) the token needs to have.
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360 */
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361 bool LDConfigParser::findToken(int& tokenPosition, QString needle, int args)
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362 {
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363 for (int i = 0; i < (countof(m_tokens) - args); ++i)
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364 {
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365 if (m_tokens[i] == needle)
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366 {
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367 tokenPosition = i;
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368 return true;
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369 }
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370 }
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371
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372 return false;
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373 }
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374
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375 /*
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376 * Returns whether or not the token at the given position has the given text value.
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377 */
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378 bool LDConfigParser::compareToken(int position, QString text)
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379 {
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380 QString token;
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381 return getToken(token, position) and (token == text);
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382 }
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383
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384 /*
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385 * Finds an attribute in the line, and fills in its value.
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386 * For instance, if the line contains "ALPHA 128", this function can find the "128" for "ALPHA".
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387 * Returns whether or not the attribute was found.
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388 */
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389 bool LDConfigParser::parseTag(QString key, QString& value)
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diff changeset
390 {
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391 int position;
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392
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393 // Try find the token and get its position
1153
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394 if (not findToken(position, key, 1))
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diff changeset
395 {
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396 return false;
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397 }
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398 else
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399 {
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diff changeset
400 // Get the token after it and store it in.
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401 return getToken(value, position + 1);
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402 }
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403 }

mercurial