src/parser.cpp

Sun, 09 Apr 2023 16:01:38 +0300

author
Teemu Piippo <teemu.s.piippo@gmail.com>
date
Sun, 09 Apr 2023 16:01:38 +0300
changeset 363
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parent 358
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permissions
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1 /*
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2 * LDForge: LDraw parts authoring CAD
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3 * Copyright (C) 2013 - 2020 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 <QRegularExpression>
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20 #include <QIODevice>
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21 #include "src/ldrawalgorithm.h"
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22 #include "src/model.h"
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23 #include "src/parser.h"
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24
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25 #define NUMBER_REGEX R"(([+-]?(?:(?:\d+\.?\d*)|(?:\.\d+))))"
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26 #define SPACE_REGEX R"(\s+)"
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27 #define VEC3_REGEX NUMBER_REGEX SPACE_REGEX NUMBER_REGEX SPACE_REGEX NUMBER_REGEX
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28 #define TWO_VECTORS VEC3_REGEX SPACE_REGEX VEC3_REGEX
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29 #define THREE_VECTORS TWO_VECTORS SPACE_REGEX VEC3_REGEX
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30 #define FOUR_VECTORS THREE_VECTORS SPACE_REGEX VEC3_REGEX
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31
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32 static const auto& exprs()
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33 {
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34 static const struct
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35 {
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36 QRegularExpression subfileRe{QStringLiteral(
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37 R"(^\s*(1)\s+(\d+)\s+)" FOUR_VECTORS SPACE_REGEX R"(([^ ]+)\s*$)"
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38 )};
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39 QRegularExpression edgeRe{QStringLiteral(
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40 R"(^\s*(2)\s+(\d+)\s+)" TWO_VECTORS R"(\s*$)"
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41 )};
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42 QRegularExpression triangleRe{QStringLiteral(
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43 R"(^\s*(3)\s+(\d+)\s+)" THREE_VECTORS R"(\s*$)"
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44 )};
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45 QRegularExpression quadRe{QStringLiteral(
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46 R"(^\s*(4)\s+(\d+)\s+)" FOUR_VECTORS R"(\s*$)"
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47 )};
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48 QRegularExpression cedgeRe{QStringLiteral(
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49 R"(^\s*(5)\s+(\d+)\s+)" FOUR_VECTORS R"(\s*$)"
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50 )};
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51 #if 0
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52 QRegularExpression bfcRe{QStringLiteral(
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53 R"(^\s*(0) (BFC (?:CERTIFY CCW|CERTIFY CW|NOCERTIFY|INVERTNEXT|CLIP|NOCLIP))\s*$)"
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54 )};
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55 #endif
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56 QRegularExpression commentRe{QStringLiteral(
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57 R"(^\s*(0)\s+(.+)$)"
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58 )};
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59 } result;
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60 return result;
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61 }
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62 template<Attribute Attrib, typename T, Attribute... Attribs>
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63 QString attrib(const LineType<T, Attribs...>& parsed)
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64 {
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65 const int index = attribIndex<LineType<T, Attribs...>, Attrib>;
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66 const TextRange& range = parsed.positions[index];
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67 const QString content = parsed.content;
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68 return parsed.content.mid(range.start, range.length);
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69 }
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70
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71 template<Attribute X, Attribute Y, Attribute Z, typename T, Attribute... Attribs>
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72 glm::vec3 vectorAttrib(const LineType<T, Attribs...>& parsed)
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73 {
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74 return glm::vec3{
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75 attrib<X>(parsed).toFloat(),
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76 attrib<Y>(parsed).toFloat(),
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77 attrib<Z>(parsed).toFloat(),
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78 };
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79 }
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80
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81 template<typename T>
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82 ColorIndex colorAttrib(T* parsed)
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83 {
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84 return ColorIndex{attrib<Attribute::Color>(*parsed).toInt()};
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85 }
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86
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87 opt<ParsedLine> parse(const QString& line)
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88 {
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89 const auto tryRe = [&line](const QRegularExpression& re){
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90 opt<QRegularExpressionMatch> result = re.match(line);
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91 if (not result->hasMatch()) {
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92 result.reset();
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93 }
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94 return result;
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95 };
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96 opt<ParsedLine> result;
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97 //! \brief Put value into result, add matched ranges to it and return a pointer
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98 const auto init = [&]<typename T>(T&& value, const QRegularExpressionMatch& match){
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99 result = value;
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100 T* parsed = &std::get<T>(*result);
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101 for (int i = 0; i < countof(T::attributes); ++i) {
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102 parsed->positions[i] = {
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103 .start = match.capturedStart(i + 1),
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104 .length = match.capturedLength(i + 1),
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105 };
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106 }
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107 parsed->content = match.captured(0);
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108 return parsed;
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109 };
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110 if (auto line1Match = tryRe(exprs().commentRe)) {
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111 LineType0* const parsed = init(LineType0{}, *line1Match);
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112 parsed->value = Comment{attrib<Attribute::Text>(*parsed)};
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113 }
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114 if (auto line1Match = tryRe(exprs().subfileRe)) {
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115 LineType1* const parsed = init(LineType1{}, *line1Match);
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116 parsed->value = {
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117 SubfileReference{
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118 .name = attrib<Attribute::Name>(*parsed),
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119 .transformation = glm::mat4{
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120 glm::vec4{vectorAttrib<Attribute::X2, Attribute::Y2, Attribute::Z2>(*parsed), 0},
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121 glm::vec4{vectorAttrib<Attribute::X3, Attribute::Y3, Attribute::Z3>(*parsed), 0},
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122 glm::vec4{vectorAttrib<Attribute::X4, Attribute::Y4, Attribute::Z4>(*parsed), 0},
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123 glm::vec4{vectorAttrib<Attribute::X1, Attribute::Y1, Attribute::Z1>(*parsed), 1}
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124 },
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125 },
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126 colorAttrib(parsed),
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127 };
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128 }
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129 else if (auto line2Match = tryRe(exprs().edgeRe)) {
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130 LineType2* const parsed = init(LineType2{}, *line2Match);
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131 parsed->value = {
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132 LineSegment{
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133 .p1 = vectorAttrib<Attribute::X1, Attribute::Y1, Attribute::Z1>(*parsed),
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134 .p2 = vectorAttrib<Attribute::X2, Attribute::Y2, Attribute::Z2>(*parsed),
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135 },
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136 colorAttrib(parsed),
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137 };
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138 }
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139 else if (auto line3Match = tryRe(exprs().triangleRe)) {
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140 LineType3* const parsed = init(LineType3{}, *line3Match);
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141 parsed->value = {
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142 Triangle{
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143 .p1 = vectorAttrib<Attribute::X1, Attribute::Y1, Attribute::Z1>(*parsed),
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144 .p2 = vectorAttrib<Attribute::X2, Attribute::Y2, Attribute::Z2>(*parsed),
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145 .p3 = vectorAttrib<Attribute::X3, Attribute::Y3, Attribute::Z3>(*parsed),
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146 },
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147 colorAttrib(parsed),
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148 };
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149 }
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150 else if (auto line4Match = tryRe(exprs().quadRe)) {
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151 LineType4* const parsed = init(LineType4{}, *line4Match);
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152 parsed->value = {
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153 Quadrilateral{
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154 .p1 = vectorAttrib<Attribute::X1, Attribute::Y1, Attribute::Z1>(*parsed),
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155 .p2 = vectorAttrib<Attribute::X2, Attribute::Y2, Attribute::Z2>(*parsed),
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156 .p3 = vectorAttrib<Attribute::X3, Attribute::Y3, Attribute::Z3>(*parsed),
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157 .p4 = vectorAttrib<Attribute::X4, Attribute::Y4, Attribute::Z4>(*parsed),
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158 },
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159 colorAttrib(parsed),
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160 };
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161 }
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162 else if (auto line5Match = tryRe(exprs().cedgeRe)) {
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163 LineType5* const parsed = init(LineType5{}, *line5Match);
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164 parsed->value = {
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165 ConditionalEdge{
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166 .p1 = vectorAttrib<Attribute::X1, Attribute::Y1, Attribute::Z1>(*parsed),
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167 .p2 = vectorAttrib<Attribute::X2, Attribute::Y2, Attribute::Z2>(*parsed),
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168 .c1 = vectorAttrib<Attribute::X3, Attribute::Y3, Attribute::Z3>(*parsed),
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169 .c2 = vectorAttrib<Attribute::X4, Attribute::Y4, Attribute::Z4>(*parsed),
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170 },
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171 colorAttrib(parsed),
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172 };
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173 }
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174 return result;
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175 }
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176
333
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177 #if 0
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178 static QRegExp re{R"((?:(\d+)\\)?(\d+)-(\d)+([a-z]+)\.dat)"};
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179 if (re.exactMatch(name)) {
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180 const auto p = std::find(std::begin(circularPrimitiveStems), std::end(circularPrimitiveStems), re.cap(4));
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181 const unsigned int divisions = (re.cap(1).isEmpty()) ? 16 : re.cap(1).toUInt();
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182 const unsigned int segments = re.cap(2).toUInt() * divisions / re.cap(3).toUInt();
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183 if (p != std::end(circularPrimitiveStems)) {
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184 const auto type = static_cast<CircularPrimitive::Type>(p - std::begin(circularPrimitiveStems));
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185 return Colored<CircularPrimitive>{
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186 CircularPrimitive{
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187 .type = type,
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188 .fraction = {segments, divisions},
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189 .transformation = transform,
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190 },
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191 color,
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192 };
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193 }
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194 }
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195 #endif
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196

mercurial