Method parseText

plugins/clang/codecompletion/includepathcompletioncontext.cpp:29–131

* Parse the last line of @p text and extract information about any existing include path from it. */

 * Parse the last line of @p text and extract information about any existing include path from it.
 */
IncludePathProperties IncludePathProperties::parseText(const QString& text, int rightBoundary)
{
    IncludePathProperties properties;

    int idx = text.lastIndexOf(QLatin1Char('\n'));
    if (idx == -1) {
        idx = 0;
    }
    if (rightBoundary == -1) {
        rightBoundary = text.length();
    }

    // what follows is a relatively simple parser for include lines that may contain comments, i.e.:
    // /*comment*/ #include /*comment*/ "path.h" /*comment*/
    enum FindState {
        FindBang,
        FindInclude,
        FindType,
        FindTypeEnd
    };
    FindState state = FindBang;
    QChar expectedEnd = QLatin1Char('>');
    for (; idx < text.size(); ++idx) {
        const auto c = text.at(idx);
        if (c.isSpace()) {
            continue;
        }
        if (c == QLatin1Char('/') && state != FindTypeEnd) {
            // skip comments
            if (idx >= text.length() - 1 || text.at(idx + 1) != QLatin1Char('*')) {
                properties.valid = false;
                return properties;
            }
            idx += 2;
            while (idx < text.length() - 1 && (text.at(idx) != QLatin1Char('*') || text.at(idx + 1) != QLatin1Char('/'))) {
                ++idx;
            }
            if (idx >= text.length() - 1 || text.at(idx) != QLatin1Char('*') || text.at(idx + 1) != QLatin1Char('/')) {
                properties.valid = false;
                return properties;
            }
            ++idx;
            continue;
        }
        switch (state) {
            case FindBang:
                if (c != QLatin1Char('#')) {
                    return properties;
                }
                state = FindInclude;
                break;
            case FindInclude: {
                constexpr QLatin1String includeString("include", 7);
                if (!matchesAtOffset(text, idx, includeString)) {
                    return properties;
                }
                idx += includeString.size() - 1;
                state = FindType;