"use strict";

function decode(encoded) {
	var result = "";
	for (var i = 0; i < encoded.length; i++) {
		var c = encoded[i];
		if (c == "+") {
			result += " ";
		} else if (c == "%") {
			result += String.fromCharCode(parseInt(encoded.slice(i + 1, i + 3), 16));
			i += 2;
		} else {
			result += c;
		}
	}
	return result;
}

function decodeForm(encoded, initial) {
	var result = initial || {};
	if (encoded) {
		encoded = encoded.trim();
		var items = encoded.split('&');
		for (var i = 0; i < items.length; i++) {
			var item = items[i];
			var equals = item.indexOf('=');
			var key = decode(item.slice(0, equals));
			var value = decode(item.slice(equals + 1));
			result[key] = value;
		}
	}
	return result;
}

exports.decodeForm = decodeForm;