Function convertIntoString

extras/catch_amalgamated.cpp:2088–2124

    }

    std::string convertIntoString(StringRef string, bool escapeInvisibles) {
        std::string ret;
        // This is enough for the "don't escape invisibles" case, and a good
        // lower bound on the "escape invisibles" case.
        ret.reserve( string.size() + 2 );

        if ( !escapeInvisibles ) {
            ret += '"';
            ret += string;
            ret += '"';
            return ret;
        }

        size_t last_start = 0;
        auto write_to = [&]( size_t idx ) {
            if ( last_start < idx ) {
                ret += string.substr( last_start, idx - last_start );
            }
            last_start = idx + 1;
        };

        ret += '"';
        for ( size_t i = 0; i < string.size(); ++i ) {
            const char c = string[i];
            if ( c == '\r' || c == '\n' || c == '\t' || c == '\f' ) {
                write_to( i );
                if ( c == '\r' ) { ret.append( "\\r" ); }
                if ( c == '\n' ) { ret.append( "\\n" ); }
                if ( c == '\t' ) { ret.append( "\\t" ); }
                if ( c == '\f' ) { ret.append( "\\f" ); }
            }
        }
        write_to( string.size() );
        ret += '"';

        return ret;
    }

    std::string convertIntoString(StringRef string) {
        return convertIntoString(string, getCurrentContext().getConfig()->showInvisibles());