tt-rss/lib/dojo/_base/json.js

/*
	Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
	Available via Academic Free License >= 2.1 OR the modified BSD license.
	see: http://dojotoolkit.org/license for details
*/


if(!dojo._hasResource["dojo._base.json"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo._base.json"] = true;
dojo.provide("dojo._base.json");


dojo.fromJson = function(/*String*/ json){
	// summary:
	// 		Parses a [JSON](http://json.org) string to return a JavaScript object.
	// description:
	// 		Throws for invalid JSON strings, but it does not use a strict JSON parser. It
	// 		delegates to eval().  The content passed to this method must therefore come
	//		from a trusted source.
	// json:
	//		a string literal of a JSON item, for instance:
	//			`'{ "foo": [ "bar", 1, { "baz": "thud" } ] }'`

	return eval("(" + json + ")"); // Object
};

dojo._escapeString = function(/*String*/str){
	//summary:
	//		Adds escape sequences for non-visual characters, double quote and
	//		backslash and surrounds with double quotes to form a valid string
	//		literal.
	return ('"' + str.replace(/(["\\])/g, '\\$1') + '"').
		replace(/[\f]/g, "\\f").replace(/[\b]/g, "\\b").replace(/[\n]/g, "\\n").
		replace(/[\t]/g, "\\t").replace(/[\r]/g, "\\r"); // string
};

dojo.toJsonIndentStr = "\t";
dojo.toJson = function(/*Object*/ it, /*Boolean?*/ prettyPrint, /*String?*/ _indentStr){
	//	summary:
	//		Returns a [JSON](http://json.org) serialization of an object.
	//	description:
	//		Returns a [JSON](http://json.org) serialization of an object.
	//		Note that this doesn't check for infinite recursion, so don't do that!
	//	it:
	//		an object to be serialized. Objects may define their own
	//		serialization via a special "__json__" or "json" function
	//		property. If a specialized serializer has been defined, it will
	//		be used as a fallback.
	//	prettyPrint:
	//		if true, we indent objects and arrays to make the output prettier.
	//		The variable `dojo.toJsonIndentStr` is used as the indent string --
	//		to use something other than the default (tab), change that variable
	//		before calling dojo.toJson().
	//	_indentStr:
	//		private variable for recursive calls when pretty printing, do not use.
	//	example:
	//		simple serialization of a trivial object
	//		|	var jsonStr = dojo.toJson({ howdy: "stranger!", isStrange: true });
	//		|	doh.is('{"howdy":"stranger!","isStrange":true}', jsonStr);
	//	example:
	//		a custom serializer for an objects of a particular class:
	//		|	dojo.declare("Furby", null, {
	//		|		furbies: "are strange",
	//		|		furbyCount: 10,
	//		|		__json__: function(){
	//		|		},
	//		|	});

	if(it === undefined){
		return "undefined";
	}
	var objtype = typeof it;
	if(objtype == "number" || objtype == "boolean"){
		return it + "";
	}
	if(it === null){
		return "null";
	}
	if(dojo.isString(it)){
		return dojo._escapeString(it);
	}
	// recurse
	var recurse = arguments.callee;
	// short-circuit for objects that support "json" serialization
	// if they return "self" then just pass-through...
	var newObj;
	_indentStr = _indentStr || "";
	var nextIndent = prettyPrint ? _indentStr + dojo.toJsonIndentStr : "";
	var tf = it.__json__||it.json;
	if(dojo.isFunction(tf)){
		newObj = tf.call(it);
		if(it !== newObj){
			return recurse(newObj, prettyPrint, nextIndent);
		}
	}
	if(it.nodeType && it.cloneNode){ // isNode
		// we can't seriailize DOM nodes as regular objects because they have cycles
		// DOM nodes could be serialized with something like outerHTML, but
		// that can be provided by users in the form of .json or .__json__ function.
		throw new Error("Can't serialize DOM nodes");
	}

	var sep = prettyPrint ? " " : "";
	var newLine = prettyPrint ? "\n" : "";

	// array
	if(dojo.isArray(it)){
		var res = dojo.map(it, function(obj){
			var val = recurse(obj, prettyPrint, nextIndent);
			if(typeof val != "string"){
				val = "undefined";
			}
			return newLine + nextIndent + val;
		});
		return "[" + res.join("," + sep) + newLine + _indentStr + "]";
	}
	/*
	// look in the registry
	try {
		window.o = it;
		newObj = dojo.json.jsonRegistry.match(it);
		return recurse(newObj, prettyPrint, nextIndent);
	}catch(e){
		// console.log(e);
	}
	// it's a function with no adapter, skip it
	*/
	if(objtype == "function"){
		return null; // null
	}
	// generic object code path
	var output = [], key;
	for(key in it){
		var keyStr, val;
		if(typeof key == "number"){
			keyStr = '"' + key + '"';
		}else if(typeof key == "string"){
			keyStr = dojo._escapeString(key);
		}else{
			// skip non-string or number keys
			continue;
		}
		val = recurse(it[key], prettyPrint, nextIndent);
		if(typeof val != "string"){
			// skip non-serializable values
			continue;
		}
		// FIXME: use += on Moz!!
		//	 MOW NOTE: using += is a pain because you have to account for the dangling comma...
		output.push(newLine + nextIndent + keyStr + ":" + sep + val);
	}
	return "{" + output.join("," + sep) + newLine + _indentStr + "}"; // String
};

}