[6382] | 1 | /* |
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| 2 | json2.js |
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| 3 | 2011-10-19 |
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| 4 | |
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| 5 | Public Domain. |
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| 6 | |
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| 7 | NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK. |
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| 8 | |
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| 9 | See http://www.JSON.org/js.html |
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| 10 | |
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| 11 | |
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| 12 | This code should be minified before deployment. |
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| 13 | See http://javascript.crockford.com/jsmin.html |
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| 14 | |
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| 15 | USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO |
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| 16 | NOT CONTROL. |
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| 17 | |
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| 18 | |
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| 19 | This file creates a global JSON object containing two methods: stringify |
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| 20 | and parse. |
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| 21 | |
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| 22 | JSON.stringify(value, replacer, space) |
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| 23 | value any JavaScript value, usually an object or array. |
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| 24 | |
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| 25 | replacer an optional parameter that determines how object |
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| 26 | values are stringified for objects. It can be a |
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| 27 | function or an array of strings. |
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| 28 | |
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| 29 | space an optional parameter that specifies the indentation |
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| 30 | of nested structures. If it is omitted, the text will |
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| 31 | be packed without extra whitespace. If it is a number, |
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| 32 | it will specify the number of spaces to indent at each |
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| 33 | level. If it is a string (such as '\t' or ' '), |
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| 34 | it contains the characters used to indent at each level. |
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| 35 | |
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| 36 | This method produces a JSON text from a JavaScript value. |
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| 37 | |
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| 38 | When an object value is found, if the object contains a toJSON |
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| 39 | method, its toJSON method will be called and the result will be |
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| 40 | stringified. A toJSON method does not serialize: it returns the |
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| 41 | value represented by the name/value pair that should be serialized, |
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| 42 | or undefined if nothing should be serialized. The toJSON method |
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| 43 | will be passed the key associated with the value, and this will be |
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| 44 | bound to the value |
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| 45 | |
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| 46 | For example, this would serialize Dates as ISO strings. |
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| 47 | |
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| 48 | Date.prototype.toJSON = function (key) { |
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| 49 | function f(n) { |
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| 50 | // Format integers to have at least two digits. |
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| 51 | return n < 10 ? '0' + n : n; |
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| 52 | } |
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| 53 | |
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| 54 | return this.getUTCFullYear() + '-' + |
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| 55 | f(this.getUTCMonth() + 1) + '-' + |
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| 56 | f(this.getUTCDate()) + 'T' + |
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| 57 | f(this.getUTCHours()) + ':' + |
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| 58 | f(this.getUTCMinutes()) + ':' + |
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| 59 | f(this.getUTCSeconds()) + 'Z'; |
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| 60 | }; |
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| 61 | |
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| 62 | You can provide an optional replacer method. It will be passed the |
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| 63 | key and value of each member, with this bound to the containing |
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| 64 | object. The value that is returned from your method will be |
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| 65 | serialized. If your method returns undefined, then the member will |
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| 66 | be excluded from the serialization. |
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| 67 | |
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| 68 | If the replacer parameter is an array of strings, then it will be |
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| 69 | used to select the members to be serialized. It filters the results |
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| 70 | such that only members with keys listed in the replacer array are |
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| 71 | stringified. |
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| 72 | |
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| 73 | Values that do not have JSON representations, such as undefined or |
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| 74 | functions, will not be serialized. Such values in objects will be |
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| 75 | dropped; in arrays they will be replaced with null. You can use |
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| 76 | a replacer function to replace those with JSON values. |
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| 77 | JSON.stringify(undefined) returns undefined. |
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| 78 | |
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| 79 | The optional space parameter produces a stringification of the |
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| 80 | value that is filled with line breaks and indentation to make it |
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| 81 | easier to read. |
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| 82 | |
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| 83 | If the space parameter is a non-empty string, then that string will |
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| 84 | be used for indentation. If the space parameter is a number, then |
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| 85 | the indentation will be that many spaces. |
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| 86 | |
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| 87 | Example: |
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| 88 | |
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| 89 | text = JSON.stringify(['e', {pluribus: 'unum'}]); |
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| 90 | // text is '["e",{"pluribus":"unum"}]' |
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| 91 | |
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| 92 | |
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| 93 | text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); |
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| 94 | // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' |
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| 95 | |
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| 96 | text = JSON.stringify([new Date()], function (key, value) { |
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| 97 | return this[key] instanceof Date ? |
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| 98 | 'Date(' + this[key] + ')' : value; |
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| 99 | }); |
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| 100 | // text is '["Date(---current time---)"]' |
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| 101 | |
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| 102 | |
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| 103 | JSON.parse(text, reviver) |
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| 104 | This method parses a JSON text to produce an object or array. |
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| 105 | It can throw a SyntaxError exception. |
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| 106 | |
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| 107 | The optional reviver parameter is a function that can filter and |
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| 108 | transform the results. It receives each of the keys and values, |
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| 109 | and its return value is used instead of the original value. |
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| 110 | If it returns what it received, then the structure is not modified. |
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| 111 | If it returns undefined then the member is deleted. |
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| 112 | |
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| 113 | Example: |
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| 114 | |
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| 115 | // Parse the text. Values that look like ISO date strings will |
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| 116 | // be converted to Date objects. |
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| 117 | |
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| 118 | myData = JSON.parse(text, function (key, value) { |
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| 119 | var a; |
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| 120 | if (typeof value === 'string') { |
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| 121 | a = |
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| 122 | /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); |
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| 123 | if (a) { |
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| 124 | return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], |
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| 125 | +a[5], +a[6])); |
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| 126 | } |
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| 127 | } |
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| 128 | return value; |
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| 129 | }); |
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| 130 | |
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| 131 | myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { |
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| 132 | var d; |
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| 133 | if (typeof value === 'string' && |
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| 134 | value.slice(0, 5) === 'Date(' && |
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| 135 | value.slice(-1) === ')') { |
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| 136 | d = new Date(value.slice(5, -1)); |
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| 137 | if (d) { |
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| 138 | return d; |
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| 139 | } |
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| 140 | } |
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| 141 | return value; |
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| 142 | }); |
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| 143 | |
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| 144 | |
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| 145 | This is a reference implementation. You are free to copy, modify, or |
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| 146 | redistribute. |
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| 147 | */ |
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| 148 | |
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| 149 | /*jslint evil: true, regexp: true */ |
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| 150 | |
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| 151 | /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, |
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| 152 | call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, |
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| 153 | getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, |
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| 154 | lastIndex, length, parse, prototype, push, replace, slice, stringify, |
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| 155 | test, toJSON, toString, valueOf |
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| 156 | */ |
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| 157 | |
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| 158 | |
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| 159 | // Create a JSON object only if one does not already exist. We create the |
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| 160 | // methods in a closure to avoid creating global variables. |
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| 161 | |
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| 162 | var JSON; |
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| 163 | if (!JSON) { |
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| 164 | JSON = {}; |
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| 165 | } |
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| 166 | |
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| 167 | (function () { |
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| 168 | 'use strict'; |
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| 169 | |
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| 170 | function f(n) { |
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| 171 | // Format integers to have at least two digits. |
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| 172 | return n < 10 ? '0' + n : n; |
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| 173 | } |
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| 174 | |
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| 175 | if (typeof Date.prototype.toJSON !== 'function') { |
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| 176 | |
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| 177 | Date.prototype.toJSON = function (key) { |
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| 178 | |
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| 179 | return isFinite(this.valueOf()) |
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| 180 | ? this.getUTCFullYear() + '-' + |
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| 181 | f(this.getUTCMonth() + 1) + '-' + |
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| 182 | f(this.getUTCDate()) + 'T' + |
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| 183 | f(this.getUTCHours()) + ':' + |
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| 184 | f(this.getUTCMinutes()) + ':' + |
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| 185 | f(this.getUTCSeconds()) + 'Z' |
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| 186 | : null; |
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| 187 | }; |
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| 188 | |
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| 189 | String.prototype.toJSON = |
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| 190 | Number.prototype.toJSON = |
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| 191 | Boolean.prototype.toJSON = function (key) { |
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| 192 | return this.valueOf(); |
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| 193 | }; |
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| 194 | } |
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| 195 | |
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| 196 | var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, |
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| 197 | 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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| 198 | gap, |
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| 199 | indent, |
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| 200 | meta = { // table of character substitutions |
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| 201 | '\b': '\\b', |
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| 202 | '\t': '\\t', |
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| 203 | '\n': '\\n', |
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| 204 | '\f': '\\f', |
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| 205 | '\r': '\\r', |
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| 206 | '"' : '\\"', |
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| 207 | '\\': '\\\\' |
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| 208 | }, |
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| 209 | rep; |
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| 210 | |
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| 211 | |
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| 212 | function quote(string) { |
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| 213 | |
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| 214 | // If the string contains no control characters, no quote characters, and no |
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| 215 | // backslash characters, then we can safely slap some quotes around it. |
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| 216 | // Otherwise we must also replace the offending characters with safe escape |
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| 217 | // sequences. |
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| 218 | |
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| 219 | escapable.lastIndex = 0; |
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| 220 | return escapable.test(string) ? '"' + string.replace(escapable, function (a) { |
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| 221 | var c = meta[a]; |
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| 222 | return typeof c === 'string' |
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| 223 | ? c |
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| 224 | : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
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| 225 | }) + '"' : '"' + string + '"'; |
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| 226 | } |
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| 227 | |
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| 228 | |
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| 229 | function str(key, holder) { |
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| 230 | |
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| 231 | // Produce a string from holder[key]. |
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| 232 | |
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| 233 | var i, // The loop counter. |
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| 234 | k, // The member key. |
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| 235 | v, // The member value. |
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| 236 | length, |
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| 237 | mind = gap, |
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| 238 | partial, |
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| 239 | value = holder[key]; |
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| 240 | |
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| 241 | // If the value has a toJSON method, call it to obtain a replacement value. |
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| 242 | |
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| 243 | if (value && typeof value === 'object' && |
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| 244 | typeof value.toJSON === 'function') { |
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| 245 | value = value.toJSON(key); |
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| 246 | } |
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| 247 | |
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| 248 | // If we were called with a replacer function, then call the replacer to |
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| 249 | // obtain a replacement value. |
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| 250 | |
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| 251 | if (typeof rep === 'function') { |
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| 252 | value = rep.call(holder, key, value); |
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| 253 | } |
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| 254 | |
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| 255 | // What happens next depends on the value's type. |
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| 256 | |
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| 257 | switch (typeof value) { |
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| 258 | case 'string': |
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| 259 | return quote(value); |
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| 260 | |
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| 261 | case 'number': |
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| 262 | |
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| 263 | // JSON numbers must be finite. Encode non-finite numbers as null. |
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| 264 | |
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| 265 | return isFinite(value) ? String(value) : 'null'; |
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| 266 | |
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| 267 | case 'boolean': |
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| 268 | case 'null': |
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| 269 | |
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| 270 | // If the value is a boolean or null, convert it to a string. Note: |
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| 271 | // typeof null does not produce 'null'. The case is included here in |
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| 272 | // the remote chance that this gets fixed someday. |
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| 273 | |
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| 274 | return String(value); |
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| 275 | |
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| 276 | // If the type is 'object', we might be dealing with an object or an array or |
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| 277 | // null. |
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| 278 | |
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| 279 | case 'object': |
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| 280 | |
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| 281 | // Due to a specification blunder in ECMAScript, typeof null is 'object', |
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| 282 | // so watch out for that case. |
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| 283 | |
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| 284 | if (!value) { |
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| 285 | return 'null'; |
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| 286 | } |
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| 287 | |
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| 288 | // Make an array to hold the partial results of stringifying this object value. |
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| 289 | |
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| 290 | gap += indent; |
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| 291 | partial = []; |
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| 292 | |
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| 293 | // Is the value an array? |
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| 294 | |
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| 295 | if (Object.prototype.toString.apply(value) === '[object Array]') { |
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| 296 | |
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| 297 | // The value is an array. Stringify every element. Use null as a placeholder |
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| 298 | // for non-JSON values. |
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| 299 | |
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| 300 | length = value.length; |
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| 301 | for (i = 0; i < length; i += 1) { |
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| 302 | partial[i] = str(i, value) || 'null'; |
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| 303 | } |
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| 304 | |
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| 305 | // Join all of the elements together, separated with commas, and wrap them in |
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| 306 | // brackets. |
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| 307 | |
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| 308 | v = partial.length === 0 |
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| 309 | ? '[]' |
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| 310 | : gap |
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| 311 | ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' |
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| 312 | : '[' + partial.join(',') + ']'; |
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| 313 | gap = mind; |
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| 314 | return v; |
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| 315 | } |
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| 316 | |
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| 317 | // If the replacer is an array, use it to select the members to be stringified. |
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| 318 | |
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| 319 | if (rep && typeof rep === 'object') { |
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| 320 | length = rep.length; |
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| 321 | for (i = 0; i < length; i += 1) { |
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| 322 | if (typeof rep[i] === 'string') { |
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| 323 | k = rep[i]; |
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| 324 | v = str(k, value); |
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| 325 | if (v) { |
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| 326 | partial.push(quote(k) + (gap ? ': ' : ':') + v); |
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| 327 | } |
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| 328 | } |
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| 329 | } |
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| 330 | } else { |
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| 331 | |
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| 332 | // Otherwise, iterate through all of the keys in the object. |
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| 333 | |
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| 334 | for (k in value) { |
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| 335 | if (Object.prototype.hasOwnProperty.call(value, k)) { |
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| 336 | v = str(k, value); |
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| 337 | if (v) { |
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| 338 | partial.push(quote(k) + (gap ? ': ' : ':') + v); |
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| 339 | } |
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| 340 | } |
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| 341 | } |
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| 342 | } |
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| 343 | |
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| 344 | // Join all of the member texts together, separated with commas, |
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| 345 | // and wrap them in braces. |
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| 346 | |
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| 347 | v = partial.length === 0 |
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| 348 | ? '{}' |
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| 349 | : gap |
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| 350 | ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' |
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| 351 | : '{' + partial.join(',') + '}'; |
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| 352 | gap = mind; |
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| 353 | return v; |
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| 354 | } |
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| 355 | } |
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| 356 | |
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| 357 | // If the JSON object does not yet have a stringify method, give it one. |
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| 358 | |
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| 359 | if (typeof JSON.stringify !== 'function') { |
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| 360 | JSON.stringify = function (value, replacer, space) { |
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| 361 | |
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| 362 | // The stringify method takes a value and an optional replacer, and an optional |
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| 363 | // space parameter, and returns a JSON text. The replacer can be a function |
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| 364 | // that can replace values, or an array of strings that will select the keys. |
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| 365 | // A default replacer method can be provided. Use of the space parameter can |
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| 366 | // produce text that is more easily readable. |
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| 367 | |
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| 368 | var i; |
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| 369 | gap = ''; |
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| 370 | indent = ''; |
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| 371 | |
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| 372 | // If the space parameter is a number, make an indent string containing that |
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| 373 | // many spaces. |
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| 374 | |
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| 375 | if (typeof space === 'number') { |
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| 376 | for (i = 0; i < space; i += 1) { |
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| 377 | indent += ' '; |
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| 378 | } |
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| 379 | |
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| 380 | // If the space parameter is a string, it will be used as the indent string. |
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| 381 | |
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| 382 | } else if (typeof space === 'string') { |
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| 383 | indent = space; |
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| 384 | } |
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| 385 | |
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| 386 | // If there is a replacer, it must be a function or an array. |
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| 387 | // Otherwise, throw an error. |
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| 388 | |
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| 389 | rep = replacer; |
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| 390 | if (replacer && typeof replacer !== 'function' && |
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| 391 | (typeof replacer !== 'object' || |
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| 392 | typeof replacer.length !== 'number')) { |
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| 393 | throw new Error('JSON.stringify'); |
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| 394 | } |
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| 395 | |
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| 396 | // Make a fake root object containing our value under the key of ''. |
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| 397 | // Return the result of stringifying the value. |
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| 398 | |
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| 399 | return str('', {'': value}); |
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| 400 | }; |
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| 401 | } |
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| 402 | |
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| 403 | |
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| 404 | // If the JSON object does not yet have a parse method, give it one. |
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| 405 | |
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| 406 | if (typeof JSON.parse !== 'function') { |
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| 407 | JSON.parse = function (text, reviver) { |
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| 408 | |
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| 409 | // The parse method takes a text and an optional reviver function, and returns |
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| 410 | // a JavaScript value if the text is a valid JSON text. |
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| 411 | |
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| 412 | var j; |
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| 413 | |
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| 414 | function walk(holder, key) { |
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| 415 | |
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| 416 | // The walk method is used to recursively walk the resulting structure so |
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| 417 | // that modifications can be made. |
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| 418 | |
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| 419 | var k, v, value = holder[key]; |
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| 420 | if (value && typeof value === 'object') { |
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| 421 | for (k in value) { |
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| 422 | if (Object.prototype.hasOwnProperty.call(value, k)) { |
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| 423 | v = walk(value, k); |
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| 424 | if (v !== undefined) { |
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| 425 | value[k] = v; |
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| 426 | } else { |
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| 427 | delete value[k]; |
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| 428 | } |
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| 429 | } |
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| 430 | } |
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| 431 | } |
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| 432 | return reviver.call(holder, key, value); |
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| 433 | } |
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| 434 | |
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| 435 | |
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| 436 | // Parsing happens in four stages. In the first stage, we replace certain |
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| 437 | // Unicode characters with escape sequences. JavaScript handles many characters |
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| 438 | // incorrectly, either silently deleting them, or treating them as line endings. |
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| 439 | |
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| 440 | text = String(text); |
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| 441 | cx.lastIndex = 0; |
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| 442 | if (cx.test(text)) { |
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| 443 | text = text.replace(cx, function (a) { |
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| 444 | return '\\u' + |
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| 445 | ('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
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| 446 | }); |
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| 447 | } |
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| 448 | |
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| 449 | // In the second stage, we run the text against regular expressions that look |
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| 450 | // for non-JSON patterns. We are especially concerned with '()' and 'new' |
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| 451 | // because they can cause invocation, and '=' because it can cause mutation. |
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| 452 | // But just to be safe, we want to reject all unexpected forms. |
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| 453 | |
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| 454 | // We split the second stage into 4 regexp operations in order to work around |
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| 455 | // crippling inefficiencies in IE's and Safari's regexp engines. First we |
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| 456 | // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we |
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| 457 | // replace all simple value tokens with ']' characters. Third, we delete all |
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| 458 | // open brackets that follow a colon or comma or that begin the text. Finally, |
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| 459 | // we look to see that the remaining characters are only whitespace or ']' or |
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| 460 | // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. |
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| 461 | |
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| 462 | if (/^[\],:{}\s]*$/ |
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| 463 | .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@') |
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| 464 | .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']') |
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| 465 | .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { |
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| 466 | |
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| 467 | // In the third stage we use the eval function to compile the text into a |
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| 468 | // JavaScript structure. The '{' operator is subject to a syntactic ambiguity |
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| 469 | // in JavaScript: it can begin a block or an object literal. We wrap the text |
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| 470 | // in parens to eliminate the ambiguity. |
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| 471 | |
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| 472 | j = eval('(' + text + ')'); |
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| 473 | |
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| 474 | // In the optional fourth stage, we recursively walk the new structure, passing |
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| 475 | // each name/value pair to a reviver function for possible transformation. |
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| 476 | |
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| 477 | return typeof reviver === 'function' |
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| 478 | ? walk({'': j}, '') |
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| 479 | : j; |
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| 480 | } |
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| 481 | |
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| 482 | // If the text is not JSON parseable, then a SyntaxError is thrown. |
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| 483 | |
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| 484 | throw new SyntaxError('JSON.parse'); |
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| 485 | }; |
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| 486 | } |
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| 487 | }()); |
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