can/util/string/deparam/deparam.js

MIT-licensed, client-side, JavaScript framework that makes building rich web applications easy.

steal('can/util', 'can/util/string', function (can) {
	// ## deparam.js  
	// `can.deparam`  
	// _Takes a string of name value pairs and returns a Object literal that represents those params._
	var digitTest = /^\d+$/,
		keyBreaker = /([^\[\]]+)|(\[\])/g,
		paramTest = /([^?#]*)(#.*)?$/,
		prep = function (str) {
			return decodeURIComponent(str.replace(/\+/g, ' '));
		};
	can.extend(can, {
		deparam: function (params) {
			var data = {}, pairs, lastPart;
			if (params && paramTest.test(params)) {
				pairs = params.split('&');
				can.each(pairs, function (pair) {
					var parts = pair.split('='),
						key = prep(parts.shift()),
						value = prep(parts.join('=')),
						current = data;
					if (key) {
						parts = key.match(keyBreaker);
						for (var j = 0, l = parts.length - 1; j < l; j++) {
							if (!current[parts[j]]) {
								// If what we are pointing to looks like an `array`
								current[parts[j]] = digitTest.test(parts[j + 1]) || parts[j + 1] === '[]' ? [] : {};
							}
							current = current[parts[j]];
						}
						lastPart = parts.pop();
						if (lastPart === '[]') {
							current.push(value);
						} else {
							current[lastPart] = value;
						}
					}
				});
			}
			return data;
		}
	});
	return can;
});