Method splitElements

3rdparty/qtcsv/sources/reader.cpp:176–302

Split string to elements @input: - line - string with data - separator - string or character that separate elements - textDelimiter - string that is used as text delimiter @output: - QList - list of elements

// @output:
// - QList<QString> - list of elements
QList<QString> ReaderPrivate::splitElements(
    const QString& line,
    const QString& separator,
    const QString& textDelimiter,
    ElementInfo& elemInfo)
{
    // If separator is empty, return whole line. Can't work in this
    // conditions!
    if (separator.isEmpty()) {
        elemInfo.isEnded = true;
        return (QList<QString>() << line);
    }

    if (line.isEmpty()) {
        // If previous row was ended, then return empty QList<QString>.
        // Otherwise return list that contains one element - new line symbols
        return elemInfo.isEnded ? QList<QString>() : (QList<QString>() << LF);
    }

    QList<QString> result;
    qsizetype pos = 0;
    while (pos < line.size()) {
        if (elemInfo.isEnded) {
            // This line is a new line, not a continuation of the previous
            // line.
            // Check if element starts with the delimiter symbol
            const auto delimiterPos = line.indexOf(textDelimiter, pos);
            if (delimiterPos == pos) {
                pos = delimiterPos + textDelimiter.size();

                // Element starts with the delimiter symbol. It means that
                // this element could contain any number of double
                // delimiters and separator symbols. This element could:
                // 1. Be the first or the middle element. Then it should end
                // with delimiter and the seprator symbols standing next to each
                // other.
                const auto midElemEndPos = findMiddleElementPosition(
                    line, pos, separator, textDelimiter);
                if (midElemEndPos > 0) {
                    const auto length = midElemEndPos - pos;
                    result << line.mid(pos, length);
                    pos =
                        midElemEndPos + textDelimiter.size() + separator.size();
                    continue;
                }

                // 2. Be The last element on the line. Then it should end with
                // delimiter symbol.
                if (isElementLast(line, pos, separator, textDelimiter)) {
                    const auto length = line.size() - textDelimiter.size() - pos;
                    result << line.mid(pos, length);
                    break;
                }

                // 3. Not ends on this line
                const auto length = line.size() - pos;
                result << line.mid(pos, length);
                elemInfo.isEnded = false;