Initial import

src/plugins/vcsbase/diffhighlighter.cpp

@@ -0,0 +1,119 @@
+/***************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact:  Qt Software Information (qt-info@nokia.com)
+**
+** 
+** Non-Open Source Usage  
+** 
+** Licensees may use this file in accordance with the Qt Beta Version
+** License Agreement, Agreement version 2.2 provided with the Software or,
+** alternatively, in accordance with the terms contained in a written
+** agreement between you and Nokia.  
+** 
+** GNU General Public License Usage 
+** 
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the packaging
+** of this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+**
+** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt GPL Exception version
+** 1.2, included in the file GPL_EXCEPTION.txt in this package.  
+** 
+***************************************************************************/
+#include "diffhighlighter.h"
+
+#include <QtCore/QDebug>
+#include <QtCore/QtAlgorithms>
+#include <QtCore/QRegExp>
+
+namespace VCSBase {
+
+// Formats used by DiffHighlighter
+enum DiffFormats {
+    DiffTextFormat,
+    DiffInFormat,
+    DiffOutFormat,
+    DiffFileFormat,
+    DiffLocationFormat,
+    NumDiffFormats
+};
+
+// --- DiffHighlighterPrivate
+struct DiffHighlighterPrivate {
+    DiffHighlighterPrivate(const QRegExp &filePattern);
+    inline DiffFormats analyzeLine(const QString &block) const;
+
+    const QRegExp m_filePattern;
+    const QString m_locationIndicator;
+    const QChar m_diffInIndicator;
+    const QChar m_diffOutIndicator;
+    QTextCharFormat m_formats[NumDiffFormats];
+};
+
+DiffHighlighterPrivate::DiffHighlighterPrivate(const QRegExp &filePattern) :
+    m_filePattern(filePattern),
+    m_locationIndicator(QLatin1String("@@")),
+    m_diffInIndicator(QLatin1Char('+')),
+    m_diffOutIndicator(QLatin1Char('-'))
+{
+    Q_ASSERT(filePattern.isValid());
+}
+
+DiffFormats DiffHighlighterPrivate::analyzeLine(const QString &text) const
+{
+    // Do not match on git "--- a/" as a deleted line, check
+    // file first
+    if (m_filePattern.exactMatch(text))
+        return DiffFileFormat;
+    if (text.startsWith(m_diffInIndicator))
+        return DiffInFormat;
+    if (text.startsWith(m_diffOutIndicator))
+        return DiffOutFormat;
+    if (text.startsWith(m_locationIndicator))
+        return DiffLocationFormat;
+    return DiffTextFormat;
+}
+
+// --- DiffHighlighter
+DiffHighlighter::DiffHighlighter(const QRegExp &filePattern,
+                                 QTextDocument *document) :
+    QSyntaxHighlighter(document),
+    m_d(new DiffHighlighterPrivate(filePattern))
+{
+}
+
+DiffHighlighter::~DiffHighlighter()
+{
+    delete m_d;
+}
+
+void DiffHighlighter::highlightBlock(const QString &text)
+{
+    if (text.isEmpty())
+        return;
+
+    const DiffFormats format = m_d->analyzeLine(text);
+    if (format != DiffTextFormat)
+        setFormat(0, text.length(), m_d->m_formats[format]);
+}
+
+void DiffHighlighter::setFormats(const QVector<QTextCharFormat> &s)
+{
+    if (s.size() == NumDiffFormats) {
+        qCopy(s.constBegin(), s.constEnd(), m_d->m_formats);
+    } else {
+        qWarning("%s: insufficient setting size: %d", Q_FUNC_INFO, s.size());
+    }
+}
+
+} // namespace VCSBase