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  • 'use strict';
    
    function hasKey(obj, keys) {
    	var o = obj;
    	keys.slice(0, -1).forEach(function (key) {
    		o = o[key] || {};
    	});
    
    	var key = keys[keys.length - 1];
    	return key in o;
    
    function isNumber(x) {
    	if (typeof x === 'number') { return true; }
    	if ((/^0x[0-9a-f]+$/i).test(x)) { return true; }
    	return (/^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/).test(x);
    
    function isConstructorOrProto(obj, key) {
    	return (key === 'constructor' && typeof obj[key] === 'function') || key === '__proto__';
    
    
    module.exports = function (args, opts) {
    	if (!opts) { opts = {}; }
    
    	var flags = {
    		bools: {},
    		strings: {},
    		unknownFn: null,
    	};
    
    	if (typeof opts.unknown === 'function') {
    		flags.unknownFn = opts.unknown;
    	}
    
    	if (typeof opts.boolean === 'boolean' && opts.boolean) {
    		flags.allBools = true;
    	} else {
    		[].concat(opts.boolean).filter(Boolean).forEach(function (key) {
    			flags.bools[key] = true;
    		});
    	}
    
    	var aliases = {};
    
    	function aliasIsBoolean(key) {
    		return aliases[key].some(function (x) {
    			return flags.bools[x];
    		});
    	}
    
    	Object.keys(opts.alias || {}).forEach(function (key) {
    		aliases[key] = [].concat(opts.alias[key]);
    		aliases[key].forEach(function (x) {
    			aliases[x] = [key].concat(aliases[key].filter(function (y) {
    				return x !== y;
    			}));
    		});
    	});
    
    	[].concat(opts.string).filter(Boolean).forEach(function (key) {
    		flags.strings[key] = true;
    		if (aliases[key]) {
    			[].concat(aliases[key]).forEach(function (k) {
    				flags.strings[k] = true;
    			});
    		}
    	});
    
    	var defaults = opts.default || {};
    
    	var argv = { _: [] };
    
    	function argDefined(key, arg) {
    		return (flags.allBools && (/^--[^=]+$/).test(arg))
    			|| flags.strings[key]
    			|| flags.bools[key]
    			|| aliases[key];
    	}
    
    	function setKey(obj, keys, value) {
    		var o = obj;
    		for (var i = 0; i < keys.length - 1; i++) {
    			var key = keys[i];
    			if (isConstructorOrProto(o, key)) { return; }
    			if (o[key] === undefined) { o[key] = {}; }
    			if (
    				o[key] === Object.prototype
    				|| o[key] === Number.prototype
    				|| o[key] === String.prototype
    			) {
    				o[key] = {};
    			}
    			if (o[key] === Array.prototype) { o[key] = []; }
    			o = o[key];
    		}
    
    		var lastKey = keys[keys.length - 1];
    		if (isConstructorOrProto(o, lastKey)) { return; }
    		if (
    			o === Object.prototype
    			|| o === Number.prototype
    			|| o === String.prototype
    		) {
    			o = {};
    		}
    		if (o === Array.prototype) { o = []; }
    		if (o[lastKey] === undefined || flags.bools[lastKey] || typeof o[lastKey] === 'boolean') {
    			o[lastKey] = value;
    		} else if (Array.isArray(o[lastKey])) {
    			o[lastKey].push(value);
    		} else {
    			o[lastKey] = [o[lastKey], value];
    		}
    	}
    
    	function setArg(key, val, arg) {
    		if (arg && flags.unknownFn && !argDefined(key, arg)) {
    			if (flags.unknownFn(arg) === false) { return; }
    		}
    
    		var value = !flags.strings[key] && isNumber(val)
    			? Number(val)
    			: val;
    		setKey(argv, key.split('.'), value);
    
    		(aliases[key] || []).forEach(function (x) {
    			setKey(argv, x.split('.'), value);
    		});
    	}
    
    	Object.keys(flags.bools).forEach(function (key) {
    		setArg(key, defaults[key] === undefined ? false : defaults[key]);
    	});
    
    	var notFlags = [];
    
    	if (args.indexOf('--') !== -1) {
    		notFlags = args.slice(args.indexOf('--') + 1);
    		args = args.slice(0, args.indexOf('--'));
    	}
    
    	for (var i = 0; i < args.length; i++) {
    		var arg = args[i];
    		var key;
    		var next;
    
    		if ((/^--.+=/).test(arg)) {
    			// Using [\s\S] instead of . because js doesn't support the
    			// 'dotall' regex modifier. See:
    			// http://stackoverflow.com/a/1068308/13216
    			var m = arg.match(/^--([^=]+)=([\s\S]*)$/);
    			key = m[1];
    			var value = m[2];
    			if (flags.bools[key]) {
    				value = value !== 'false';
    			}
    			setArg(key, value, arg);
    		} else if ((/^--no-.+/).test(arg)) {
    			key = arg.match(/^--no-(.+)/)[1];
    			setArg(key, false, arg);
    		} else if ((/^--.+/).test(arg)) {
    			key = arg.match(/^--(.+)/)[1];
    			next = args[i + 1];
    			if (
    				next !== undefined
    				&& !(/^(-|--)[^-]/).test(next)
    				&& !flags.bools[key]
    				&& !flags.allBools
    				&& (aliases[key] ? !aliasIsBoolean(key) : true)
    			) {
    				setArg(key, next, arg);
    				i += 1;
    			} else if ((/^(true|false)$/).test(next)) {
    				setArg(key, next === 'true', arg);
    				i += 1;
    			} else {
    				setArg(key, flags.strings[key] ? '' : true, arg);
    			}
    		} else if ((/^-[^-]+/).test(arg)) {
    			var letters = arg.slice(1, -1).split('');
    
    			var broken = false;
    			for (var j = 0; j < letters.length; j++) {
    				next = arg.slice(j + 2);
    
    				if (next === '-') {
    					setArg(letters[j], next, arg);
    					continue;
    				}
    
    				if ((/[A-Za-z]/).test(letters[j]) && next[0] === '=') {
    					setArg(letters[j], next.slice(1), arg);
    					broken = true;
    					break;
    				}
    
    				if (
    					(/[A-Za-z]/).test(letters[j])
    					&& (/-?\d+(\.\d*)?(e-?\d+)?$/).test(next)
    				) {
    					setArg(letters[j], next, arg);
    					broken = true;
    					break;
    				}
    
    				if (letters[j + 1] && letters[j + 1].match(/\W/)) {
    					setArg(letters[j], arg.slice(j + 2), arg);
    					broken = true;
    					break;
    				} else {
    					setArg(letters[j], flags.strings[letters[j]] ? '' : true, arg);
    				}
    			}
    
    			key = arg.slice(-1)[0];
    			if (!broken && key !== '-') {
    				if (
    					args[i + 1]
    					&& !(/^(-|--)[^-]/).test(args[i + 1])
    					&& !flags.bools[key]
    					&& (aliases[key] ? !aliasIsBoolean(key) : true)
    				) {
    					setArg(key, args[i + 1], arg);
    					i += 1;
    				} else if (args[i + 1] && (/^(true|false)$/).test(args[i + 1])) {
    					setArg(key, args[i + 1] === 'true', arg);
    					i += 1;
    				} else {
    					setArg(key, flags.strings[key] ? '' : true, arg);
    				}
    			}
    		} else {
    			if (!flags.unknownFn || flags.unknownFn(arg) !== false) {
    				argv._.push(flags.strings._ || !isNumber(arg) ? arg : Number(arg));
    			}
    			if (opts.stopEarly) {
    				argv._.push.apply(argv._, args.slice(i + 1));
    				break;
    			}
    		}
    	}
    
    	Object.keys(defaults).forEach(function (k) {
    		if (!hasKey(argv, k.split('.'))) {
    			setKey(argv, k.split('.'), defaults[k]);
    
    			(aliases[k] || []).forEach(function (x) {
    				setKey(argv, x.split('.'), defaults[k]);
    			});
    		}
    	});
    
    	if (opts['--']) {
    		argv['--'] = notFlags.slice();
    	} else {
    		notFlags.forEach(function (k) {
    			argv._.push(k);
    		});
    	}
    
    	return argv;
    };