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/* |
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json2.js |
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2013-05-26 |
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|
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Public Domain. |
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|
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NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK. |
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|
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See http://www.JSON.org/js.html |
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|
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|
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This code should be minified before deployment. |
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See http://javascript.crockford.com/jsmin.html |
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|
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USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO |
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NOT CONTROL. |
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|
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|
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This file creates a global JSON object containing two methods: stringify |
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and parse. |
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|
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JSON.stringify(value, replacer, space) |
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value any JavaScript value, usually an object or array. |
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|
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replacer an optional parameter that determines how object |
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values are stringified for objects. It can be a |
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function or an array of strings. |
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|
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space an optional parameter that specifies the indentation |
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of nested structures. If it is omitted, the text will |
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be packed without extra whitespace. If it is a number, |
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it will specify the number of spaces to indent at each |
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level. If it is a string (such as '\t' or ' '), |
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it contains the characters used to indent at each level. |
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|
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This method produces a JSON text from a JavaScript value. |
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|
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When an object value is found, if the object contains a toJSON |
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method, its toJSON method will be called and the result will be |
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stringified. A toJSON method does not serialize: it returns the |
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value represented by the name/value pair that should be serialized, |
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or undefined if nothing should be serialized. The toJSON method |
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will be passed the key associated with the value, and this will be |
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bound to the value |
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|
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For example, this would serialize Dates as ISO strings. |
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|
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Date.prototype.toJSON = function (key) { |
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function f(n) { |
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// Format integers to have at least two digits. |
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return n < 10 ? '0' + n : n; |
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} |
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|
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return this.getUTCFullYear() + '-' + |
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f(this.getUTCMonth() + 1) + '-' + |
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f(this.getUTCDate()) + 'T' + |
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f(this.getUTCHours()) + ':' + |
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f(this.getUTCMinutes()) + ':' + |
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f(this.getUTCSeconds()) + 'Z'; |
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}; |
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|
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You can provide an optional replacer method. It will be passed the |
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key and value of each member, with this bound to the containing |
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object. The value that is returned from your method will be |
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serialized. If your method returns undefined, then the member will |
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be excluded from the serialization. |
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|
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If the replacer parameter is an array of strings, then it will be |
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used to select the members to be serialized. It filters the results |
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such that only members with keys listed in the replacer array are |
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stringified. |
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|
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Values that do not have JSON representations, such as undefined or |
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functions, will not be serialized. Such values in objects will be |
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dropped; in arrays they will be replaced with null. You can use |
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a replacer function to replace those with JSON values. |
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JSON.stringify(undefined) returns undefined. |
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|
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The optional space parameter produces a stringification of the |
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value that is filled with line breaks and indentation to make it |
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easier to read. |
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|
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If the space parameter is a non-empty string, then that string will |
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be used for indentation. If the space parameter is a number, then |
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the indentation will be that many spaces. |
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|
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Example: |
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|
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text = JSON.stringify(['e', {pluribus: 'unum'}]); |
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// text is '["e",{"pluribus":"unum"}]' |
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|
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|
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text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); |
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// text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' |
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|
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text = JSON.stringify([new Date()], function (key, value) { |
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return this[key] instanceof Date ? |
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'Date(' + this[key] + ')' : value; |
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}); |
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// text is '["Date(---current time---)"]' |
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|
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|
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JSON.parse(text, reviver) |
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This method parses a JSON text to produce an object or array. |
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It can throw a SyntaxError exception. |
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|
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The optional reviver parameter is a function that can filter and |
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transform the results. It receives each of the keys and values, |
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and its return value is used instead of the original value. |
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If it returns what it received, then the structure is not modified. |
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If it returns undefined then the member is deleted. |
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|
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Example: |
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|
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// Parse the text. Values that look like ISO date strings will |
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// be converted to Date objects. |
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|
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myData = JSON.parse(text, function (key, value) { |
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var a; |
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if (typeof value === 'string') { |
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a = |
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/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); |
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if (a) { |
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return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], |
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+a[5], +a[6])); |
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} |
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} |
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return value; |
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}); |
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|
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myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { |
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var d; |
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if (typeof value === 'string' && |
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value.slice(0, 5) === 'Date(' && |
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value.slice(-1) === ')') { |
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d = new Date(value.slice(5, -1)); |
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if (d) { |
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return d; |
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} |
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} |
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return value; |
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}); |
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|
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|
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This is a reference implementation. You are free to copy, modify, or |
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redistribute. |
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*/ |
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|
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/*jslint evil: true, regexp: true */ |
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|
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/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, |
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call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, |
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getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, |
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lastIndex, length, parse, prototype, push, replace, slice, stringify, |
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test, toJSON, toString, valueOf |
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*/ |
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|
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|
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// Create a JSON object only if one does not already exist. We create the |
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// methods in a closure to avoid creating global variables. |
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|
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if (typeof JSON !== 'object') { |
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JSON = {}; |
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} |
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|
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(function () { |
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'use strict'; |
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|
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function f(n) { |
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// Format integers to have at least two digits. |
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return n < 10 ? '0' + n : n; |
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} |
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|
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if (typeof Date.prototype.toJSON !== 'function') { |
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|
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Date.prototype.toJSON = function () { |
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|
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return isFinite(this.valueOf()) |
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? this.getUTCFullYear() + '-' + |
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f(this.getUTCMonth() + 1) + '-' + |
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f(this.getUTCDate()) + 'T' + |
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f(this.getUTCHours()) + ':' + |
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f(this.getUTCMinutes()) + ':' + |
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f(this.getUTCSeconds()) + 'Z' |
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: null; |
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}; |
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|
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String.prototype.toJSON = |
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Number.prototype.toJSON = |
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Boolean.prototype.toJSON = function () { |
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return this.valueOf(); |
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}; |
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} |
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|
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var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, |
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escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, |
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gap, |
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indent, |
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meta = { // table of character substitutions |
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'\b': '\\b', |
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'\t': '\\t', |
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'\n': '\\n', |
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'\f': '\\f', |
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'\r': '\\r', |
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'"' : '\\"', |
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'\\': '\\\\' |
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}, |
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rep; |
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|
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|
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function quote(string) { |
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|
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// If the string contains no control characters, no quote characters, and no |
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// backslash characters, then we can safely slap some quotes around it. |
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// Otherwise we must also replace the offending characters with safe escape |
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// sequences. |
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|
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escapable.lastIndex = 0; |
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return escapable.test(string) ? '"' + string.replace(escapable, function (a) { |
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var c = meta[a]; |
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return typeof c === 'string' |
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? c |
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: '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
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}) + '"' : '"' + string + '"'; |
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} |
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|
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|
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function str(key, holder) { |
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|
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// Produce a string from holder[key]. |
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|
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var i, // The loop counter. |
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k, // The member key. |
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v, // The member value. |
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length, |
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mind = gap, |
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partial, |
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value = holder[key]; |
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|
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// If the value has a toJSON method, call it to obtain a replacement value. |
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|
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if (value && typeof value === 'object' && |
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typeof value.toJSON === 'function') { |
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value = value.toJSON(key); |
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} |
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|
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// If we were called with a replacer function, then call the replacer to |
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// obtain a replacement value. |
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|
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if (typeof rep === 'function') { |
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value = rep.call(holder, key, value); |
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} |
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|
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// What happens next depends on the value's type. |
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|
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switch (typeof value) { |
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case 'string': |
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return quote(value); |
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|
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case 'number': |
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|
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// JSON numbers must be finite. Encode non-finite numbers as null. |
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|
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return isFinite(value) ? String(value) : 'null'; |
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|
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case 'boolean': |
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case 'null': |
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|
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// If the value is a boolean or null, convert it to a string. Note: |
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// typeof null does not produce 'null'. The case is included here in |
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// the remote chance that this gets fixed someday. |
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|
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return String(value); |
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|
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// If the type is 'object', we might be dealing with an object or an array or |
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// null. |
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|
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case 'object': |
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|
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// Due to a specification blunder in ECMAScript, typeof null is 'object', |
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// so watch out for that case. |
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|
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if (!value) { |
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return 'null'; |
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} |
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|
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// Make an array to hold the partial results of stringifying this object value. |
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|
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gap += indent; |
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partial = []; |
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|
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// Is the value an array? |
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|
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if (Object.prototype.toString.apply(value) === '[object Array]') { |
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|
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// The value is an array. Stringify every element. Use null as a placeholder |
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// for non-JSON values. |
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|
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length = value.length; |
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for (i = 0; i < length; i += 1) { |
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partial[i] = str(i, value) || 'null'; |
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} |
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|
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// Join all of the elements together, separated with commas, and wrap them in |
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// brackets. |
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|
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v = partial.length === 0 |
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? '[]' |
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: gap |
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? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' |
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: '[' + partial.join(',') + ']'; |
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gap = mind; |
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return v; |
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} |
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|
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// If the replacer is an array, use it to select the members to be stringified. |
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|
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if (rep && typeof rep === 'object') { |
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length = rep.length; |
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for (i = 0; i < length; i += 1) { |
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if (typeof rep[i] === 'string') { |
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k = rep[i]; |
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v = str(k, value); |
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if (v) { |
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partial.push(quote(k) + (gap ? ': ' : ':') + v); |
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} |
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} |
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} |
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} else { |
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|
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// Otherwise, iterate through all of the keys in the object. |
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|
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for (k in value) { |
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if (Object.prototype.hasOwnProperty.call(value, k)) { |
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v = str(k, value); |
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if (v) { |
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partial.push(quote(k) + (gap ? ': ' : ':') + v); |
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} |
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} |
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} |
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} |
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|
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// Join all of the member texts together, separated with commas, |
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// and wrap them in braces. |
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|
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v = partial.length === 0 |
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? '{}' |
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: gap |
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? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' |
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: '{' + partial.join(',') + '}'; |
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gap = mind; |
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return v; |
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} |
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} |
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|
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// If the JSON object does not yet have a stringify method, give it one. |
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|
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if (typeof JSON.stringify !== 'function') { |
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JSON.stringify = function (value, replacer, space) { |
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|
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// The stringify method takes a value and an optional replacer, and an optional |
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// space parameter, and returns a JSON text. The replacer can be a function |
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// that can replace values, or an array of strings that will select the keys. |
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// A default replacer method can be provided. Use of the space parameter can |
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// produce text that is more easily readable. |
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|
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var i; |
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gap = ''; |
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indent = ''; |
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|
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// If the space parameter is a number, make an indent string containing that |
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// many spaces. |
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|
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if (typeof space === 'number') { |
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for (i = 0; i < space; i += 1) { |
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indent += ' '; |
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} |
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|
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// If the space parameter is a string, it will be used as the indent string. |
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|
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} else if (typeof space === 'string') { |
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indent = space; |
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} |
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|
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// If there is a replacer, it must be a function or an array. |
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// Otherwise, throw an error. |
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|
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rep = replacer; |
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if (replacer && typeof replacer !== 'function' && |
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(typeof replacer !== 'object' || |
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typeof replacer.length !== 'number')) { |
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throw new Error('JSON.stringify'); |
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} |
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|
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// Make a fake root object containing our value under the key of ''. |
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// Return the result of stringifying the value. |
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|
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return str('', {'': value}); |
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}; |
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} |
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|
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|
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// If the JSON object does not yet have a parse method, give it one. |
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|
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if (typeof JSON.parse !== 'function') { |
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JSON.parse = function (text, reviver) { |
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|
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// The parse method takes a text and an optional reviver function, and returns |
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// a JavaScript value if the text is a valid JSON text. |
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|
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var j; |
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|
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function walk(holder, key) { |
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|
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// The walk method is used to recursively walk the resulting structure so |
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// that modifications can be made. |
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|
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var k, v, value = holder[key]; |
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if (value && typeof value === 'object') { |
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for (k in value) { |
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if (Object.prototype.hasOwnProperty.call(value, k)) { |
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v = walk(value, k); |
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if (v !== undefined) { |
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value[k] = v; |
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} else { |
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delete value[k]; |
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} |
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} |
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} |
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} |
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return reviver.call(holder, key, value); |
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} |
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|
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|
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// Parsing happens in four stages. In the first stage, we replace certain |
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// Unicode characters with escape sequences. JavaScript handles many characters |
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// incorrectly, either silently deleting them, or treating them as line endings. |
| 438 |
|
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text = String(text); |
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cx.lastIndex = 0; |
| 441 |
if (cx.test(text)) { |
| 442 |
text = text.replace(cx, function (a) { |
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return '\\u' + |
| 444 |
('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
| 445 |
}); |
| 446 |
} |
| 447 |
|
| 448 |
// In the second stage, we run the text against regular expressions that look |
| 449 |
// for non-JSON patterns. We are especially concerned with '()' and 'new' |
| 450 |
// because they can cause invocation, and '=' because it can cause mutation. |
| 451 |
// But just to be safe, we want to reject all unexpected forms. |
| 452 |
|
| 453 |
// We split the second stage into 4 regexp operations in order to work around |
| 454 |
// crippling inefficiencies in IE's and Safari's regexp engines. First we |
| 455 |
// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we |
| 456 |
// replace all simple value tokens with ']' characters. Third, we delete all |
| 457 |
// open brackets that follow a colon or comma or that begin the text. Finally, |
| 458 |
// we look to see that the remaining characters are only whitespace or ']' or |
| 459 |
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. |
| 460 |
|
| 461 |
if (/^[\],:{}\s]*$/ |
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.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@') |
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.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']') |
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.replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { |
| 465 |
|
| 466 |
// In the third stage we use the eval function to compile the text into a |
| 467 |
// JavaScript structure. The '{' operator is subject to a syntactic ambiguity |
| 468 |
// in JavaScript: it can begin a block or an object literal. We wrap the text |
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// in parens to eliminate the ambiguity. |
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|
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j = eval('(' + text + ')'); |
| 472 |
|
| 473 |
// In the optional fourth stage, we recursively walk the new structure, passing |
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// each name/value pair to a reviver function for possible transformation. |
| 475 |
|
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return typeof reviver === 'function' |
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? walk({'': j}, '') |
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: j; |
| 479 |
} |
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|
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// If the text is not JSON parseable, then a SyntaxError is thrown. |
| 482 |
|
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throw new SyntaxError('JSON.parse'); |
| 484 |
}; |
| 485 |
} |
| 486 |
}()); |