Function parser_isValidComplex

quest/src/core/parser.cpp:273–305

bool parser_isValidComplex(string str) {

    // reject str if it doesn't match complex regex
    if (!parser_isAnySizedComplex(str))
        return false;

    // we've so far gauranteed str has a valid form, but we must now check 
    // each included complex component (which we enumerate) is in range of a qreal
    sregex_iterator it(str.begin(), str.end(), regexes::real);
    sregex_iterator end;

    // valid coeffs contain 1 or 2 reals, never 0, which regex should have caught
    if (it == end)
        error_attemptedToParseComplexFromInvalidString();

    // for each of the 1 or 2 components...
    for (; it != end; it++) {

        // check component is in-range of qreal via duck-typing
        try {
            precisionAgnosticStringToFloat(it->str(0));
        } catch (const out_of_range&) {
            return false;

        // error if our regex permitted an unparsable component
        } catch (const invalid_argument&) {
            error_attemptedToParseComplexFromInvalidString();
        }
    }

    // report that each/all detected components of str can form a valid qcomp
    return true;
}


qcomp parser_parseComplex(string str) {