emujs/js/assets/json2.js

A responsiveness testing tool on browsers

// @source https://github.com/douglascrockford/JSON-js/
var json2 = JSON || (function(){
	var ret = {};
	var rx_one = /^[\],:{}\s]*$/, rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, rx_four = /(?:^|:|,)(?:\s*\[)+/g, rx_escapable = /[\\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
	function f(n) {
		return n < 10 ? '0' + n : n;
	}
	if (typeof Date.prototype.toJSON !== 'function') {
		Date.prototype.toJSON = function() {
			return isFinite(this.valueOf()) ? this.getUTCFullYear() + '-' + f(this.getUTCMonth() + 1) + '-' + f(this.getUTCDate()) + 'T' + f(this.getUTCHours()) + ':' + f(this.getUTCMinutes()) + ':' + f(this.getUTCSeconds()) + 'Z' : null;
		};
		Boolean.prototype.toJSON = function(){
			return this.valueOf();
		};
		Number.prototype.toJSON = function(){
			return this.valueOf();
		};
		String.prototype.toJSON = function(){
			return this.valueOf();
		};
	}
	var gap, indent, meta, rep;
	function quote(string) {
		rx_escapable.lastIndex = 0;
		return rx_escapable.test(string) ? '"' + string.replace(rx_escapable, function(a) {
			var c = meta[a];
			return typeof c === 'string' ? c : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
		}) + '"' : '"' + string + '"';
	}
	function str(key, holder) {
		var i, k, v, length, mind = gap, partial, value = holder[key];
		if (value && typeof value === 'object' && typeof value.toJSON === 'function') {
			value = value.toJSON(key);
		}
		if (typeof rep === 'function') {
			value = rep.call(holder, key, value);
		}
		switch(typeof value) {
			case 'string':
				return quote(value);
			case 'number':
				return isFinite(value) ? String(value) : 'null';
			case 'boolean':
			case 'null':
				return String(value);
			case 'object':
				if (!value) {
					return 'null';
				}
				gap += indent;
				partial = [];
				if (Object.prototype.toString.apply(value) === '[object Array]') {
					length = value.length;
					for (i = 0;i < length;i += 1) {
						partial[i] = str(i, value) || 'null';
					}
					v = partial.length === 0 ? '[]' : gap ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' : '[' + partial.join(',') + ']';
					gap = mind;
					return v;
				}
				if (rep && typeof rep === 'object') {
					length = rep.length;
					for (i = 0;i < length;i += 1) {
						if (typeof rep[i] === 'string') {
							k = rep[i];
							v = str(k, value);
							if (v) {
								partial.push(quote(k) + (gap ? ': ' : ':') + v);
							}
						}
					}
				} else {
					for (k in value) {
						if (Object.prototype.hasOwnProperty.call(value, k)) {
							v = str(k, value);
							if (v) {
								partial.push(quote(k) + (gap ? ': ' : ':') + v);
							}
						}
					}
				}
				v = partial.length === 0 ? '{}' : gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' : '{' + partial.join(',') + '}';
				gap = mind;
				return v;
		}
	}
	meta = {'\b':'\\b', '\t':'\\t', '\n':'\\n', '\f':'\\f', '\r':'\\r', '"':'\\"', '\\':'\\\\'};
	ret.stringify = function(value, replacer, space) {
		var i;
		gap = '';
		indent = '';
		if (typeof space === 'number') {
			for (i = 0;i < space;i += 1) {
				indent += ' ';
			}
		} else {
			if (typeof space === 'string') {
				indent = space;
			}
		}
		rep = replacer;
		if (replacer && typeof replacer !== 'function' && (typeof replacer !== 'object' || typeof replacer.length !== 'number')) {
			throw new Error('JSON.stringify');
		}
		return str('', {'':value});
	};

	ret.parse = function(text, reviver) {
		var j;
		function walk(holder, key) {
			var k, v, value = holder[key];
			if (value && typeof value === 'object') {
				for (k in value) {
					if (Object.prototype.hasOwnProperty.call(value, k)) {
						v = walk(value, k);
						if (v !== undefined) {
							value[k] = v;
						} else {
							delete value[k];
						}
					}
				}
			}
			return reviver.call(holder, key, value);
		}
		text = String(text);
		rx_dangerous.lastIndex = 0;
		if (rx_dangerous.test(text)) {
			text = text.replace(rx_dangerous, function(a) {
				return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
			});
		}
		if (rx_one.test(text.replace(rx_two, '@').replace(rx_three, ']').replace(rx_four, ''))) {
			j = eval('(' + text + ')'); // jshint ignore:line
			return typeof reviver === 'function' ? walk({'':j}, '') : j;
		}
		throw new SyntaxError('JSON.parse');
	};
})();