diff -r 6de5ac1fb471 -r 3a9e761e4faa src/colors.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/colors.cpp	Wed Jan 22 00:23:29 2020 +0200
@@ -0,0 +1,84 @@
+/*
+ *  LDForge: LDraw parts authoring CAD
+ *  Copyright (C) 2013 - 2020 Teemu Piippo
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "colors.h"
+
+const ColorTable::ColorDefinition ColorTable::unknownColor{{}, {}, "Unknown"};
+
+void ColorTable::clear()
+{
+	definitions = {};
+}
+
+Result ColorTable::load(QIODevice& device, QTextStream& errors)
+{
+	this->clear();
+	if (device.isReadable())
+	{
+		QTextStream stream{&device};
+		QString line;
+		while (stream.readLineInto(&line))
+		{
+			this->loadColorFromString(line);
+		}
+		return Success;
+	}
+	else
+	{
+		errors << "could not read colors";
+		return Failure;
+	}
+}
+
+const ColorTable::ColorDefinition& ColorTable::operator[](Color color) const
+{
+	auto it = this->definitions.find(color.index);
+	if (it != this->definitions.end())
+	{
+		return *it;
+	}
+	else
+	{
+		return unknownColor;
+	}
+}
+
+void ColorTable::loadColorFromString(const QString& string)
+{
+	const QRegExp pattern{
+		R"(^\s*0 \!COLOUR\s+([^\s]+)\s+)"_q +
+		R"(CODE\s+(\d+)\s+)"_q +
+		R"(VALUE\s+(\#[0-9a-fA-F]{3,6})\s+)"_q +
+		R"(EDGE\s+(\#[0-9a-fA-F]{3,6}))"_q +
+		R"((?:\s+ALPHA\s+(\d+))?)"_q
+	};
+	if (pattern.indexIn(string) != -1)
+	{
+		const int code = pattern.cap(2).toInt();
+		ColorDefinition& definition = definitions[code];
+		definition = {}; // in case there's an existing definition
+		definition.name = pattern.cap(1);
+		definition.faceColor = pattern.cap(3);
+		definition.edgeColor = pattern.cap(4);
+		if (not pattern.cap(5).isEmpty())
+		{
+			const int alpha = pattern.cap(5).toInt();
+			definition.faceColor.setAlpha(alpha);
+		}
+	}
+}