Simple Command Parser

CmdParser.cpp

#include <string>
#include <vector>
#include <unordered_map>

using namespace std;

/*
 * @ A simple parser can recognize shell command options in format
 *   "--<option> <args>" or "--<option>=<args>".
 * @ Note. It tolerate spaces in args.
 *  e.g.
 *  > CmdParser.exe --abc 123 456 --def=789 012
 *  param : abc, value : 123 456
 *  param : def, value : 789 012
 */
unordered_map<string, string> Parse(const vector<string>& cmds) {
	unordered_map<string, string> options;	// (name, value)
	for (int i = 0; i < cmds.size(); i++) {
		string name, value;
		if (cmds[i].substr(0, 2) == "--") {
			auto equal = cmds[i].find('=');
			if (equal != string::npos) {
				name = cmds[i].substr(2, equal - 2);		// "--" => 2
				value = cmds[i].substr(equal + 1) + " ";	// "=" => 1
			} else {
				name = cmds[i].substr(2);
				value = "";
			}

			while (i + 1 < cmds.size() && cmds[i + 1].substr(0, 2) != "--") {
				value += cmds[i + 1] + " ";
				i++;
			}

			if (!value.empty() && value.back() == ' ') value.pop_back();
			options[name] = value;
		}
	}
	return options;
}