Function parseHunks

kdevplatform/vcs/vcsdiff.cpp:224–288

* Parses a unified diff into a list of "diff hunks" (each hunk starts with a * line starting with @@ and represents a collection of localized changes). * * @param diff a diff in git's unified diff format * @returns a list of hunk structures * * The diff is assumed to be a collection of hunks, where each hunk has the * following structure: * * METADATA

     * generates them anyway for files with unresolved conflicts.
     */
    std::vector<DiffHunk> parseHunks(VcsDiff& diff)
    {
        std::vector<DiffHunk> ret;
        int lineNo = -1;
        QString curSrcFileName, curTgtFileName;
        QStringListIterator lines(diff.diff().split(QLatin1Char('\n')));
        while (lines.hasNext()) {
            lineNo++;
            auto curln = lines.next();
            auto m = DIFF_FILENAME_RE->match(curln);
            if (m.hasMatch()) {
                if (curln.startsWith(QLatin1Char('-')))
                    curSrcFileName = m.captured(1);
                else if (curln.startsWith(QLatin1Char('+')))
                    curTgtFileName = m.captured(1);
                continue;
            }
            m = HUNK_HEADER_RE->match(curln);
            if (!m.hasMatch())
                continue;
            const auto [oldStart, oldCount] = parseRange(m.capturedView(1));
            const auto [newStart, newCount] = parseRange(m.capturedView(2));
            auto heading = m.captured(3);
            uint firstLineIdx = lineNo;
            QStringList hunkLines;
            while (lines.hasNext()
                   && (CONFLICT_START_RE->match(lines.peekNext()).hasMatch()
                       || !META_LINE_RE->match(lines.peekNext()).hasMatch())) {
                // Consume the conflict
                if (CONFLICT_START_RE->match(lines.peekNext()).hasMatch()) {
                    lineNo++;
                    hunkLines << lines.next();
                    while (lines.hasNext() && !CONFLICT_END_RE->match(lines.peekNext()).hasMatch()) {
                        lineNo++;
                        hunkLines << lines.next();
                    }
                    if (!CONFLICT_END_RE->match(lines.peekNext()).hasMatch()) {
                        qCWarning(VCS) << "Invalid diff format, end of file reached before conflict finished";
                        qCDebug(VCS) << diff.diff();
                        break;
                    }
                }
                lineNo++;
                hunkLines << lines.next();
            }

            // The number of filenames present in the diff should match the number
            // of hunks
            ret.push_back({ oldStart, oldCount, newStart, newCount, firstLineIdx, curSrcFileName, curTgtFileName,
                            heading, hunkLines });
        }

        // If the diff ends with a newline, for the last hunk, when splitting into lines above
        // we will always get an empty string at the end, which we now remove
        if (diff.diff().endsWith(QLatin1Char('\n'))) {
            if (ret.size() > 0 && ret.back().lines.size() > 0) {
                ret.back().lines.pop_back();
            } else {