io-query.js

define(["./_base/lang"], function(lang){

	// module:
	//		dojo/io-query

	var backstop = {};

	return {
		// summary:
		//		This module defines query string processing functions.

		objectToQuery: function objectToQuery(/*Object*/ map){
			// summary:
			//		takes a name/value mapping object and returns a string representing
			//		a URL-encoded version of that object.
			// example:
			//		this object:
			//
			//	|	{
			//	|		blah: "blah",
			//	|		multi: [
			//	|			"thud",
			//	|			"thonk"
			//	|		]
			//	|	};
			//
			//		yields the following query string:
			//
			//	|	"blah=blah&multi=thud&multi=thonk"

			// FIXME: need to implement encodeAscii!!
			var enc = encodeURIComponent, pairs = [];
			for(var name in map){
				var value = map[name];
				if(value != backstop[name]){
					var assign = enc(name) + "=";
					if(lang.isArray(value)){
						for(var i = 0, l = value.length; i < l; ++i){
							pairs.push(assign + enc(value[i]));
						}
					}else{
						pairs.push(assign + enc(value));
					}
				}
			}
			return pairs.join("&"); // String
		},

		queryToObject: function queryToObject(/*String*/ str){
			// summary:
			//		Create an object representing a de-serialized query section of a
			//		URL. Query keys with multiple values are returned in an array.
			//
			// example:
			//		This string:
			//
			//	|		"foo=bar&foo=baz&thinger=%20spaces%20=blah&zonk=blarg&"
			//
			//		results in this object structure:
			//
			//	|		{
			//	|			foo: [ "bar", "baz" ],
			//	|			thinger: " spaces =blah",
			//	|			zonk: "blarg"
			//	|		}
			//
			//		Note that spaces and other urlencoded entities are correctly
			//		handled.

        	var dec = decodeURIComponent, qp = str.split("&"), ret = {}, name, val;
			for(var i = 0, l = qp.length, item; i < l; ++i){
				item = qp[i];
				if(item.length){
					var s = item.indexOf("=");
					if(s < 0){
						name = dec(item);
						val = "";
					}else{
						name = dec(item.slice(0, s));
						val = dec(item.slice(s + 1));
					}
					if(typeof ret[name] == "string"){ // inline'd type check
						ret[name] = [ret[name]];
					}

					if(lang.isArray(ret[name])){
						ret[name].push(val);
					}else{
						ret[name] = val;
					}
				}
			}
			return ret; // Object
		}
	};
});