int CmdLineParser::parse()

in reInvent18_Developer_Workshop/filter2D/src/host/cmdlineparser.cpp [170:261]
67 lines of code
17 McCabe index (conditional complexity)

int CmdLineParser::parse(int argc, char* argv[]) {

	int i = 0;
	int ctOptions = 0;
	while(i < argc) {
		string key, val;
		bool iskey = false;
		string token = string(argv[i]);

		bool isNextTokenKey = false;
		if(i + 1 < argc) {
			 string peeknext = string(argv[i+1]);
			 if(starts_with(peeknext, "-") || starts_with(peeknext, "--")) {
				 string fullkey;
				 isNextTokenKey = token_to_fullkeyname(peeknext, fullkey);
			 }
		}




		//full-key
		if(starts_with(token, string("--"))) {
			if(m_mapKeySwitch.find(token) == m_mapKeySwitch.end()) {
				LogError("Unrecognized key passed %s", token.c_str());
				printHelp();
				return -1;
			}

			key = token;
			iskey = true;
		}
		//shortcut
		else if(starts_with(token, "-")) {
			if(m_mapShortcutKeys.find(token) == m_mapShortcutKeys.end()) {
				LogError("Unrecognized shortcut key passed %s", token.c_str());
				printHelp();
				return -1;
			}

			key = m_mapShortcutKeys[token];
			iskey = true;
		}
		//default key, the value for default key is the last argument
		else if(isNextTokenKey == false && m_strDefaultKey.length() > 0 && i == argc - 2) {
			if(m_mapKeySwitch.find(m_strDefaultKey) == m_mapKeySwitch.end()) {
				LogError("Unrecognized default key %s", m_strDefaultKey.c_str());
				printHelp();
				return -1;
			}

			LogInfo("Using default key: %s", m_strDefaultKey.c_str());
			key = m_strDefaultKey;
			iskey = true;
		}

		//if iskey and needs param then read it
		if(iskey) {
			ctOptions++;

			if(key == "--help") {
				printHelp();
				return 1;
			}

			//fetch value
			CmdSwitch* pcmd = m_mapKeySwitch[key];

			//read next
			if(pcmd->istoggle) {
				pcmd->value = string("true");
				pcmd->isvalid = true;
			}
			else {
				i++;
				pcmd->value = string(argv[i]);
				pcmd->isvalid = true;
			}

		}

		//next token
		i++;
	}

	//capture real app name
	if(argc > 0) {
		m_appname = string(argv[0]);
	}

	return ctOptions;
}