void ColorStartPatternConverter::parseColor()

in src/main/cpp/colorstartpatternconverter.cpp [224:277]
44 lines of code
10 McCabe index (conditional complexity)

void ColorStartPatternConverter::parseColor(const LogString& color, LogString* result){
	LogString lower = StringHelper::toLowerCase(color);
	Pool pool;

	// If the color we are trying to parse is blank, clear our result
	if(StringHelper::trim(color).empty() ||
			StringHelper::equalsIgnoreCase(color,
										   LOG4CXX_STR("NONE"),
										   LOG4CXX_STR("none"))){
		result->clear();
		return;
	}

	if( StringHelper::startsWith(lower, LOG4CXX_STR("\\x1b")) ){
		if( color[color.size() - 1] != 'm' ){
			// In order for this to be a valid ANSI escape sequence,
			// it must end with an 'm'.  If it does not, reject.
			return;
		}
		// We start with an escape sequence, copy the data over after the escape byte
		result->clear();
		result->append(LOG4CXX_STR("\x1b"));
		for( size_t x = 4; x < color.size(); x++ ){
			result->push_back(color[x]);
		}
	}else{
		// We do not start with an escape sequence: try to parse color
		// Escape sequence information:
		// https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
		// https://en.wikipedia.org/wiki/ANSI_escape_code
		result->clear();
		result->append(LOG4CXX_STR("\x1b["));
		LogString tmp;
		for( size_t x = 0; x < color.size(); x++ ){
			if(color[x] == '|' ){
				LogString toAppend = convertSingleSequence(tmp, pool);
				tmp.clear();
				if(!toAppend.empty()){
					result->push_back(';');
					result->append(toAppend);
				}
			}else{
				tmp.push_back(color[x]);
			}
		}
		LogString toAppend = convertSingleSequence(tmp, pool);
		tmp.clear();
		if(!toAppend.empty()){
			result->push_back(';');
			result->append(toAppend);
		}
		result->append(LOG4CXX_STR("m"));
	}
}