src/parser.cpp

Thu, 03 Oct 2019 23:44:28 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Thu, 03 Oct 2019 23:44:28 +0300
changeset 6
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parent 5
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child 8
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permissions
-rw-r--r--

language support

3
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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 "model.h"
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20 #include "parser.h"
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21 #include "objecttypes/comment.h"
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22 #include "objecttypes/conditionaledge.h"
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23 #include "objecttypes/edge.h"
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24 #include "objecttypes/errorline.h"
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25 #include "objecttypes/modelobject.h"
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26 #include "objecttypes/polygon.h"
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27 #include "objecttypes/subfilereference.h"
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28
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29 /*
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30 * Constructs an LDraw parser
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31 */
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32 Parser::Parser(QIODevice& device, QObject* parent) :
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33 QObject {parent},
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34 device {device} {}
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35
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36 /*
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37 * Reads a single line from the device.
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38 */
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39 QString Parser::readLine()
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40 {
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41 return QString::fromUtf8(this->device.readLine()).trimmed();
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42 }
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43
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44 static const QMap<QString, decltype(LDHeader::type)> typeStrings {
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45 {"Part", LDHeader::Part},
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46 {"Subpart", LDHeader::Subpart},
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47 {"Shortcut", LDHeader::Shortcut},
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48 {"Primitive", LDHeader::Primitive},
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49 {"8_Primitive", LDHeader::Primitive_8},
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50 {"48_Primitive", LDHeader::Primitive_48},
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51 {"Configuration", LDHeader::Configuration},
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52 };
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53
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54 /*
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55 * Parses a single line of the header.
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56 * Possible parse results:
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57 * · ParseSuccess: the header line was parsed successfully.
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58 * · ParseFailure: the header line was parsed incorrectly and needs to be handled otherwise.
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59 * · StopParsing: the line does not belong in the header and header parsing needs to stop.
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60 */
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61 Parser::HeaderParseResult Parser::parseHeaderLine(
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62 LDHeader& header,
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63 Winding& winding,
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64 const QString& line
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65 ) {
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66 if (line.isEmpty())
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67 {
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68 return ParseSuccess;
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69 }
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70 else if (not line.startsWith("0") or line.startsWith("0 //"))
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71 {
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72 return StopParsing;
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73 }
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74 else if (line.startsWith("0 !LDRAW_ORG "))
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75 {
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76 QStringList tokens = line
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77 .mid(strlen("0 !LDRAW_ORG "))
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78 .split(" ", QString::SkipEmptyParts);
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79 if (not tokens.isEmpty())
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80 {
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81 QString partTypeString = tokens[0];
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82 // Anything that enters LDForge becomes unofficial in any case if saved.
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83 // Therefore we don't need to give the Unofficial type any special
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84 // consideration.
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85 if (partTypeString.startsWith("Unofficial_"))
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86 partTypeString = partTypeString.mid(strlen("Unofficial_"));
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87 header.type = typeStrings.value(partTypeString, LDHeader::Part);
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88 header.qualfiers = 0;
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89 if (tokens.contains("Alias"))
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90 header.qualfiers |= LDHeader::Alias;
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91 if (tokens.contains("Physical_Color"))
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92 header.qualfiers |= LDHeader::Physical_Color;
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93 if (tokens.contains("Flexible_Section"))
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94 header.qualfiers |= LDHeader::Flexible_Section;
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95 return ParseSuccess;
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96 }
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97 else
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98 {
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99 return ParseFailure;
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100 }
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101 }
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102 else if (line == "0 BFC CERTIFY CCW")
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103 {
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104 winding = CounterClockwise;
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105 return ParseSuccess;
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106 }
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107 else if (line == "0 BFC CERTIFY CW")
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108 {
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109 winding = Clockwise;
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110 return ParseSuccess;
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111 }
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112 else if (line == "0 BFC NOCERTIFY")
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113 {
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114 winding = NoWinding;
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115 return ParseSuccess;
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116 }
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117 else if (line.startsWith("0 !HISTORY "))
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118 {
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119 static const QRegExp historyRegexp {
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120 R"(0 !HISTORY\s+(\d{4}-\d{2}-\d{2})\s+)"
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121 R"((\{[^}]+|\[[^]]+)[\]}]\s+(.+))"
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122 };
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123 if (historyRegexp.exactMatch(line))
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124 {
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125 QString dateString = historyRegexp.capturedTexts().value(1);
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126 QString authorWithPrefix = historyRegexp.capturedTexts().value(2);
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127 QString description = historyRegexp.capturedTexts().value(3);
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128 LDHeader::HistoryEntry historyEntry;
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129 historyEntry.date = QDate::fromString(dateString, Qt::ISODate);
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130 historyEntry.description = description;
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131
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132 if (authorWithPrefix[0] == '{')
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133 historyEntry.author = authorWithPrefix + "}";
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134 else
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135 historyEntry.author = authorWithPrefix.mid(1);
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136
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137 header.history.append(historyEntry);
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138 return ParseSuccess;
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139 }
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140 else
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141 {
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142 return ParseFailure;
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143 }
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144 }
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145 else if (line.startsWith("0 Author: "))
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146 {
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147 header.author = line.mid(strlen("0 Author: "));
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148 return ParseSuccess;
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149 }
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150 else if (line.startsWith("0 Name: "))
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151 {
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152 header.name = line.mid(strlen("0 Name: "));
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153 return ParseSuccess;
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parents:
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154 }
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parents:
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155 else if (line.startsWith("0 !HELP "))
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parents:
diff changeset
156 {
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parents:
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157 if (not header.help.isEmpty())
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158 header.help += "\n";
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159 header.help += line.mid(strlen("0 !HELP "));
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160 return ParseSuccess;
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parents:
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161 }
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parents:
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162 else if (line.startsWith("0 !KEYWORDS "))
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parents:
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163 {
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parents:
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164 if (not header.keywords.isEmpty())
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165 header.keywords += "\n";
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166 header.keywords += line.mid(strlen("0 !KEYWORDS "));
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167 return ParseSuccess;
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168 }
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169 else if (line.startsWith("0 !CATEGORY "))
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170 {
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171 header.category = line.mid(strlen("0 !CATEGORY "));
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172 return ParseSuccess;
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173 }
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parents:
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174 else if (line.startsWith("0 !CMDLINE "))
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175 {
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176 header.cmdline = line.mid(strlen("0 !CMDLINE "));
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177 return ParseSuccess;
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178 }
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179 else if (line.startsWith("0 !LICENSE Redistributable under CCAL version 2.0"))
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180 {
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181 header.license = LDHeader::CaLicense;
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182 return ParseSuccess;
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183 }
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184 else if (line.startsWith("0 !LICENSE Not redistributable"))
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185 {
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parents:
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186 header.license = LDHeader::NonCaLicense;
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187 return ParseSuccess;
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188 }
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189 else
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parents:
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190 {
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191 return ParseFailure;
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parents:
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192 }
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193 }
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194
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parents:
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195 /*
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196 * Parses the header from the device given at construction and returns
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197 * the resulting header structure.
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198 */
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199 LDHeader Parser::parseHeader(Winding& winding)
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200 {
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parents:
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201 LDHeader header = {};
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parents:
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202 if (not this->device.atEnd())
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203 {
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204 // Parse the description
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205 QString descriptionLine = this->readLine();
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parents:
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206 if (descriptionLine.startsWith("0 "))
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parents:
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207 {
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parents:
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208 header.description = descriptionLine.mid(strlen("0 ")).trimmed();
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parents:
diff changeset
209 // Parse the rest of the header
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parents:
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210 while (not this->device.atEnd())
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211 {
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parents:
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212 const QString& line = this->readLine();
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213 auto result = parseHeaderLine(header, winding, line);
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214 if (result == ParseFailure)
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parents:
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215 {
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parents:
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216 // Failed to parse this header line, add it as a comment into the body later.
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217 this->bag.append(line);
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218 }
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219 else if (result == StopParsing)
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220 {
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221 // Header parsing stops, add this line to the body.
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222 this->bag.append(line);
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parents:
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223 break;
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parents:
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224 }
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parents:
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225 }
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parents:
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226 }
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parents:
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227 else
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parents:
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228 {
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229 this->bag.append(descriptionLine);
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230 }
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parents:
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231 }
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parents:
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232 return header;
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parents:
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233 }
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parents:
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234
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Teemu Piippo <teemu@hecknology.net>
parents:
diff changeset
235 /**
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parents:
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236 * @brief Parses the model body into the given model.
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parents:
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237 * @param editor Handle to model edit context
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238 */
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parents:
diff changeset
239 void Parser::parseBody(Model::EditContext& editor)
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240 {
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parents:
diff changeset
241 bool invertNext = false;
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Teemu Piippo <teemu@hecknology.net>
parents:
diff changeset
242 while (not this->device.atEnd())
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parents:
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243 this->bag.append(this->readLine());
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parents:
diff changeset
244 for (const QString& line : this->bag)
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parents:
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245 {
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parents:
diff changeset
246 if (line == "0 BFC INVERTNEXT" or line == "0 BFC CERTIFY INVERTNEXT")
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parents:
diff changeset
247 {
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parents:
diff changeset
248 invertNext = true;
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Teemu Piippo <teemu@hecknology.net>
parents:
diff changeset
249 continue;
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parents:
diff changeset
250 }
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Teemu Piippo <teemu@hecknology.net>
parents:
diff changeset
251 modelobjects::BaseObject* object = parseFromString(editor, line);
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parents:
diff changeset
252 if (invertNext)
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parents:
diff changeset
253 {
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parents:
diff changeset
254 editor.setObjectProperty(object, modelobjects::Property::IsInverted, true);
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parents:
diff changeset
255 }
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Teemu Piippo <teemu@hecknology.net>
parents:
diff changeset
256 invertNext = false;
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parents:
diff changeset
257 }
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Teemu Piippo <teemu@hecknology.net>
parents:
diff changeset
258 }
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parents:
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259
4
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
260 namespace
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
261 {
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
262 namespace regexes
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
263 {
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
264 static const QRegExp comment {R"(^\s*0\s*\/\/\s*(.+)$)"};
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parents: 3
diff changeset
265 static const QRegExp metacommand {R"(^\s*0\s*(.+)$)"};
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parents: 3
diff changeset
266 static const QRegExp edgeline
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parents: 3
diff changeset
267 {
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
268 R"(^\s*2)" // starting 2-token
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Teemu Piippo <teemu@hecknology.net>
parents: 3
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269 R"(\s+(\d+))" // colour
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parents: 3
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270 R"(((?:\s+[^\s]+){3}))" // 1st vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
271 R"(((?:\s+[^\s]+){3}))" // 2nd vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
272 R"(\s*$)" // end
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
273 };
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
274 static const QRegExp triangle
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
275 {
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
276 R"(^\s*3)" // starting 3-token
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
277 R"(\s+(\d+))" // colour
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
278 R"(((?:\s+[^\s]+){3}))" // 1st vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
279 R"(((?:\s+[^\s]+){3}))" // 2nd vertex
68988ebc2a68 added regular expressions for the parser
Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
280 R"(((?:\s+[^\s]+){3}))" // 3rd vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
281 R"(\s*$)" // end
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
282 };
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
283 static const QRegExp quadrilateral
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
284 {
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
285 R"(^\s*4)" // starting 4-token
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
286 R"(\s+(\d+))" // colour
68988ebc2a68 added regular expressions for the parser
Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
287 R"(((?:\s+[^\s]+){3}))" // 1st vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
288 R"(((?:\s+[^\s]+){3}))" // 2nd vertex
68988ebc2a68 added regular expressions for the parser
Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
289 R"(((?:\s+[^\s]+){3}))" // 3rd vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
290 R"(((?:\s+[^\s]+){3}))" // 4th vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
291 R"(\s*$)" // end
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
292 };
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
293 static const QRegExp conditionaledge
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
294 {
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
295 R"(^\s*5)" // starting 5-token
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
296 R"(\s+(\d+))" // colour
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
297 R"(((?:\s+[^\s]+){3}))" // 1st vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
298 R"(((?:\s+[^\s]+){3}))" // 2nd vertex
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
299 R"(((?:\s+[^\s]+){3}))" // 1st control point
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
300 R"(((?:\s+[^\s]+){3}))" // 2nd control point
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
301 R"(\s*$)" // end
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
302 };
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Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
303 }
68988ebc2a68 added regular expressions for the parser
Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
304 }
68988ebc2a68 added regular expressions for the parser
Teemu Piippo <teemu@hecknology.net>
parents: 3
diff changeset
305
5
Teemu Piippo <teemu@hecknology.net>
parents: 4
diff changeset
306 static Vertex vertexFromString(const QString& vertex_string)
Teemu Piippo <teemu@hecknology.net>
parents: 4
diff changeset
307 {
Teemu Piippo <teemu@hecknology.net>
parents: 4
diff changeset
308 static const QRegExp pattern {R"(^\s*([^\s]+)\s+([^\s]+)\s+([^\s]+)\s*$)"};
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309 const bool succeeded = pattern.exactMatch(vertex_string);
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310 if (succeeded)
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311 {
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312 const float x = pattern.cap(1).toFloat(nullptr);
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313 const float y = pattern.cap(2).toFloat(nullptr);
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314 const float z = pattern.cap(3).toFloat(nullptr);
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315 return {x, y, z};
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316 }
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317 else
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318 {
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319 return {};
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320 }
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321 }
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322
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323 static modelobjects::Edge* parseEdgeline(
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324 Model::EditContext& editor,
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325 const QString& line)
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326 {
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327 const bool succeeded = regexes::edgeline.exactMatch(line);
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328 if (succeeded)
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329 {
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330 const Color colour = {regexes::edgeline.cap(1).toInt(nullptr)};
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331 const Vertex v_1 = vertexFromString(regexes::edgeline.cap(2));
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332 const Vertex v_2 = vertexFromString(regexes::edgeline.cap(3));
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333 return editor.append<modelobjects::Edge>(v_1, v_2, colour);
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334 }
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335 else
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336 {
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337 return nullptr;
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338 }
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339 }
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340
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341 modelobjects::BaseObject* Parser::parseFromString(
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342 Model::EditContext& editor,
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343 const QString& line)
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344 {
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345 modelobjects::Edge* edge = parseEdgeline(editor, line);
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346 if (edge)
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347 {
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348 return edge;
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349 }
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350 return editor.append<modelobjects::ErrorLine>(line);
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351 }

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