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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "splitter.h"
#include <QRegularExpression>
FileDataList splitDiffToFiles(const QString &strData)
{
FileDataList ret;
QString splitExpression;
if (strData.contains(QLatin1String("==== ")) && strData.contains(QLatin1String(" ====\n"))) {
// Perforce diff
splitExpression = QLatin1String("==== ([^\\n\\r]+) - ([^\\n\\r]+) ====");
} else if (strData.contains(QLatin1String("--- ")) && strData.contains(QLatin1String("\n+++ "))) {
// Unified contextual diff
splitExpression = QLatin1String("\\-\\-\\- ([^\\n\\r]*)"
"\\n\\+\\+\\+ ([^\\n\\r]*)");
} else if (strData.contains(QLatin1String("*** ")) && strData.contains(QLatin1String("\n--- "))) {
// Copied contextual diff
splitExpression = QLatin1String("\\*\\*\\* ([^\\n\\r]*) [0-9\\-]* [0-9:\\.]*[^\\n\\r]*"
"\\n\\-\\-\\- ([^\\n\\r]*) [0-9\\-]* [0-9:\\.]*[^\\n\\r]*");
} else {
return FileDataList();
}
int splitIndex = 0, previousSplit = -1;
const QRegularExpression splitExpr(splitExpression);
QString filename;
// The algorithm works like this:
// On the first match we only get the filename of the first patch part
// On the second match (if any) we get the diff content, and the name of the next file patch
QRegularExpressionMatch match;
while ((match = splitExpr.match(strData, splitIndex)).hasMatch()) {
splitIndex = match.capturedStart();
if (!filename.isEmpty()) {
QString content = strData.mid(previousSplit, splitIndex - previousSplit);
ret.append(FileData(filename, content));
}
// If the first index in not at the beginning of the file, then we know there's content
// we're about to skip, which is common in commit diffs, so we get that content and give it
// a 'fake' filename.
if (previousSplit == -1 && splitIndex > 0 && filename.isEmpty()) {
QString content = strData.left(splitIndex);
ret.append(FileData(QLatin1String("<Header information>"), content));
}
filename = match.captured(1);
previousSplit = splitIndex;
++splitIndex;
}
// Append the last patch content
if (!filename.isEmpty()) {
const QString content = strData.mid(previousSplit);
ret.append(FileData(filename, content));
}
return ret;
}
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