Method removeExtraSymbols

3rdparty/qtcsv/sources/reader.cpp:413–458

Remove extra symbols (spaces, text delimeters...) @input: - elements - list of row elements - textDelimiter - string that is used as text delimiter

// - elements - list of row elements
// - textDelimiter - string that is used as text delimiter
void ReaderPrivate::removeExtraSymbols(
    QList<QString>& elements, const QString& textDelimiter)
{
    if (elements.isEmpty()) { return; }

    const auto doubleTextDelim = textDelimiter + textDelimiter;
    for (auto i = 0; i < elements.size(); ++i) {
        const auto str = QStringView{elements.at(i)};
        if (str.isEmpty()) { continue; }

        qsizetype startPos = 0, endPos = str.size() - 1;

        // Find first non-space char
        for (; startPos < str.size() &&
               str.at(startPos).category() == QChar::Separator_Space;
             ++startPos);

        // Find last non-space char
        for (;
             endPos >= 0 && str.at(endPos).category() == QChar::Separator_Space;
             --endPos);

        if (!textDelimiter.isEmpty()) {
            // Skip text delimiter symbol if element starts with it
            const auto strStart = str.mid(startPos, textDelimiter.size());
            if (strStart == textDelimiter) {
                startPos += textDelimiter.size();
            }

            // Skip text delimiter symbol if element ends with it
            const auto strEnd = str.mid(
                endPos - textDelimiter.size() + 1, textDelimiter.size());
            if (strEnd == textDelimiter) {
                endPos -= textDelimiter.size();
            }
        }

        if ((0 < startPos || endPos < str.size() - 1) &&
            startPos <= endPos) {
            elements[i] = elements[i].mid(startPos, endPos - startPos + 1);
        }

        // Also replace double text delimiter with one text delimiter symbol
        elements[i].replace(doubleTextDelim, textDelimiter);
    }
}

// ReadToListProcessor - processor that saves rows of elements to list.
class ReadToListProcessor : public Reader::AbstractProcessor {