From 57fd674ea20f28b03c3e143d296c60d550b2ebe8 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 31 Dec 2018 10:37:16 +0100
Subject: Add syntax highlighting to the editor.

---
 src/highlighter.cc | 145 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 src/highlighter.cc

(limited to 'src/highlighter.cc')

diff --git a/src/highlighter.cc b/src/highlighter.cc
new file mode 100644
index 0000000..37259f6
--- /dev/null
+++ b/src/highlighter.cc
@@ -0,0 +1,145 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "highlighter.h"
+
+Highlighter::Highlighter(QTextDocument *parent)
+	: QSyntaxHighlighter(parent)
+{
+	HighlightingRule rule;
+
+	keywordFormat.setForeground(Qt::darkBlue);
+	keywordFormat.setFontWeight(QFont::Bold);
+	QStringList keywordPatterns;
+
+	// Lua keywords
+	keywordPatterns << "\\band\\b" << "\\bbreak\\b" << "\\bdo\\b"
+	                << "\\belse\\b" << "\\belseif\\b"
+	                << "\\bend\\b" << "\\bfalse\\b" << "\\bfor\\b"
+	                << "\\bfunction\\b" << "\\bif\\b"
+	                << "\\bin\\b" << "\\blocal\\b" << "\\bnil\\b"
+	                << "\\bnot\\b" << "\\bor\\b"
+	                << "\\brepeat\\b"<< "\\breturn\\b" << "\\bthen\\b"
+	                << "\\btrue\\b" << "\\buntil\\b" << "\\bwhile\\b";
+	foreach(const QString &pattern, keywordPatterns)
+	{
+		rule.pattern = QRegularExpression(pattern);
+		rule.format = keywordFormat;
+		highlightingRules.append(rule);
+	}
+
+	classFormat.setFontWeight(QFont::Bold);
+	classFormat.setForeground(Qt::darkMagenta);
+	rule.pattern = QRegularExpression("\\bQ[A-Za-z]+\\b");
+	rule.format = classFormat;
+	highlightingRules.append(rule);
+
+	singleLineCommentFormat.setForeground(Qt::red);
+	rule.pattern = QRegularExpression("--[^\n]*");
+	rule.format = singleLineCommentFormat;
+	highlightingRules.append(rule);
+
+	multiLineCommentFormat.setForeground(Qt::red);
+
+	quotationFormat.setForeground(Qt::darkGreen);
+	rule.pattern = QRegularExpression("\".*\"");
+	rule.format = quotationFormat;
+	highlightingRules.append(rule);
+
+	functionFormat.setFontItalic(true);
+	functionFormat.setForeground(Qt::blue);
+	rule.pattern = QRegularExpression("\\b[A-Za-z0-9_]+(?=\\()");
+	rule.format = functionFormat;
+	highlightingRules.append(rule);
+
+	commentStartExpression = QRegularExpression("--\\[\\[");
+	commentEndExpression = QRegularExpression("--\\]\\]");
+}
+
+void Highlighter::highlightBlock(const QString &text)
+{
+	foreach (const HighlightingRule &rule, highlightingRules)
+	{
+		QRegularExpressionMatchIterator matchIterator =
+			rule.pattern.globalMatch(text);
+		while(matchIterator.hasNext())
+		{
+			QRegularExpressionMatch match = matchIterator.next();
+			setFormat(match.capturedStart(), match.capturedLength(), rule.format);
+		}
+	}
+	setCurrentBlockState(0);
+
+	int startIndex = 0;
+	if(previousBlockState() != 1)
+	{
+		startIndex = text.indexOf(commentStartExpression);
+	}
+
+	while(startIndex >= 0)
+	{
+		QRegularExpressionMatch match =
+			commentEndExpression.match(text, startIndex);
+		int endIndex = match.capturedStart();
+		int commentLength = 0;
+		if(endIndex == -1)
+		{
+			setCurrentBlockState(1);
+			commentLength = text.length() - startIndex;
+		}
+		else
+		{
+			commentLength = endIndex - startIndex
+				+ match.capturedLength();
+		}
+		setFormat(startIndex, commentLength, multiLineCommentFormat);
+		startIndex = text.indexOf(commentStartExpression,
+		                          startIndex + commentLength);
+	}
+}
-- 
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