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annotate js/json2.js @ 98:97fc889dbed4

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Added tag v2 for changeset d1f7c1d38abe
author Atul Varma <avarma@mozilla.com>
date Mon, 26 Apr 2010 22:16:32 -0700
parents 516e69809e06
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
85
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1 /*
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2 http://www.JSON.org/json2.js
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3 2010-03-20
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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 '&nbsp;'),
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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, strict: false */
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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 if (!this.JSON) {
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163 this.JSON = {};
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164 }
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165
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166 (function () {
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167
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168 function f(n) {
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169 // Format integers to have at least two digits.
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170 return n < 10 ? '0' + n : n;
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171 }
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172
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173 if (typeof Date.prototype.toJSON !== 'function') {
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174
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175 Date.prototype.toJSON = function (key) {
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176
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177 return isFinite(this.valueOf()) ?
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178 this.getUTCFullYear() + '-' +
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179 f(this.getUTCMonth() + 1) + '-' +
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180 f(this.getUTCDate()) + 'T' +
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181 f(this.getUTCHours()) + ':' +
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182 f(this.getUTCMinutes()) + ':' +
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183 f(this.getUTCSeconds()) + 'Z' : null;
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184 };
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185
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186 String.prototype.toJSON =
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187 Number.prototype.toJSON =
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188 Boolean.prototype.toJSON = function (key) {
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189 return this.valueOf();
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190 };
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191 }
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192
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193 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
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194 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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195 gap,
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196 indent,
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197 meta = { // table of character substitutions
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198 '\b': '\\b',
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199 '\t': '\\t',
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200 '\n': '\\n',
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201 '\f': '\\f',
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202 '\r': '\\r',
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203 '"' : '\\"',
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204 '\\': '\\\\'
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205 },
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206 rep;
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207
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208
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209 function quote(string) {
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210
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211 // If the string contains no control characters, no quote characters, and no
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212 // backslash characters, then we can safely slap some quotes around it.
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213 // Otherwise we must also replace the offending characters with safe escape
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214 // sequences.
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215
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216 escapable.lastIndex = 0;
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217 return escapable.test(string) ?
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218 '"' + string.replace(escapable, function (a) {
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219 var c = meta[a];
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220 return typeof c === 'string' ? c :
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221 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
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222 }) + '"' :
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223 '"' + string + '"';
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224 }
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225
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226
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227 function str(key, holder) {
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228
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229 // Produce a string from holder[key].
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230
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231 var i, // The loop counter.
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232 k, // The member key.
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233 v, // The member value.
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234 length,
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235 mind = gap,
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236 partial,
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237 value = holder[key];
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238
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239 // If the value has a toJSON method, call it to obtain a replacement value.
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240
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241 if (value && typeof value === 'object' &&
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242 typeof value.toJSON === 'function') {
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243 value = value.toJSON(key);
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244 }
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245
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246 // If we were called with a replacer function, then call the replacer to
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247 // obtain a replacement value.
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248
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249 if (typeof rep === 'function') {
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250 value = rep.call(holder, key, value);
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251 }
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252
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253 // What happens next depends on the value's type.
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254
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255 switch (typeof value) {
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256 case 'string':
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257 return quote(value);
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258
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259 case 'number':
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260
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261 // JSON numbers must be finite. Encode non-finite numbers as null.
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262
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263 return isFinite(value) ? String(value) : 'null';
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264
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265 case 'boolean':
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266 case 'null':
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267
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268 // If the value is a boolean or null, convert it to a string. Note:
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269 // typeof null does not produce 'null'. The case is included here in
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270 // the remote chance that this gets fixed someday.
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271
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272 return String(value);
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273
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274 // If the type is 'object', we might be dealing with an object or an array or
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275 // null.
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276
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277 case 'object':
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278
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279 // Due to a specification blunder in ECMAScript, typeof null is 'object',
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280 // so watch out for that case.
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281
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282 if (!value) {
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283 return 'null';
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284 }
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285
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286 // Make an array to hold the partial results of stringifying this object value.
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287
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288 gap += indent;
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289 partial = [];
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290
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291 // Is the value an array?
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292
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293 if (Object.prototype.toString.apply(value) === '[object Array]') {
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294
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295 // The value is an array. Stringify every element. Use null as a placeholder
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296 // for non-JSON values.
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297
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298 length = value.length;
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299 for (i = 0; i < length; i += 1) {
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300 partial[i] = str(i, value) || 'null';
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301 }
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302
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303 // Join all of the elements together, separated with commas, and wrap them in
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304 // brackets.
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305
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306 v = partial.length === 0 ? '[]' :
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307 gap ? '[\n' + gap +
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308 partial.join(',\n' + gap) + '\n' +
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309 mind + ']' :
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310 '[' + partial.join(',') + ']';
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311 gap = mind;
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312 return v;
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313 }
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314
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315 // If the replacer is an array, use it to select the members to be stringified.
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316
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317 if (rep && typeof rep === 'object') {
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318 length = rep.length;
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319 for (i = 0; i < length; i += 1) {
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320 k = rep[i];
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321 if (typeof k === 'string') {
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322 v = str(k, value);
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323 if (v) {
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324 partial.push(quote(k) + (gap ? ': ' : ':') + v);
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325 }
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326 }
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327 }
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328 } else {
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329
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330 // Otherwise, iterate through all of the keys in the object.
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331
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332 for (k in value) {
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333 if (Object.hasOwnProperty.call(value, k)) {
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334 v = str(k, value);
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335 if (v) {
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336 partial.push(quote(k) + (gap ? ': ' : ':') + v);
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337 }
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338 }
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339 }
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340 }
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341
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342 // Join all of the member texts together, separated with commas,
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343 // and wrap them in braces.
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344
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345 v = partial.length === 0 ? '{}' :
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346 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
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347 mind + '}' : '{' + partial.join(',') + '}';
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348 gap = mind;
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349 return v;
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350 }
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351 }
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352
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353 // If the JSON object does not yet have a stringify method, give it one.
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354
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355 if (typeof JSON.stringify !== 'function') {
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356 JSON.stringify = function (value, replacer, space) {
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357
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358 // The stringify method takes a value and an optional replacer, and an optional
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359 // space parameter, and returns a JSON text. The replacer can be a function
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360 // that can replace values, or an array of strings that will select the keys.
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361 // A default replacer method can be provided. Use of the space parameter can
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362 // produce text that is more easily readable.
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363
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364 var i;
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365 gap = '';
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366 indent = '';
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367
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368 // If the space parameter is a number, make an indent string containing that
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369 // many spaces.
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370
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371 if (typeof space === 'number') {
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372 for (i = 0; i < space; i += 1) {
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373 indent += ' ';
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374 }
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375
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376 // If the space parameter is a string, it will be used as the indent string.
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377
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378 } else if (typeof space === 'string') {
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379 indent = space;
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380 }
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381
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382 // If there is a replacer, it must be a function or an array.
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383 // Otherwise, throw an error.
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384
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385 rep = replacer;
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386 if (replacer && typeof replacer !== 'function' &&
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387 (typeof replacer !== 'object' ||
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388 typeof replacer.length !== 'number')) {
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389 throw new Error('JSON.stringify');
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diff changeset
390 }
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391
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392 // Make a fake root object containing our value under the key of ''.
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393 // Return the result of stringifying the value.
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394
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395 return str('', {'': value});
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diff changeset
396 };
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397 }
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398
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diff changeset
399
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400 // If the JSON object does not yet have a parse method, give it one.
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diff changeset
401
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402 if (typeof JSON.parse !== 'function') {
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diff changeset
403 JSON.parse = function (text, reviver) {
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diff changeset
404
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405 // The parse method takes a text and an optional reviver function, and returns
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diff changeset
406 // a JavaScript value if the text is a valid JSON text.
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diff changeset
407
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diff changeset
408 var j;
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diff changeset
409
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diff changeset
410 function walk(holder, key) {
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diff changeset
411
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diff changeset
412 // The walk method is used to recursively walk the resulting structure so
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parents:
diff changeset
413 // that modifications can be made.
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414
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415 var k, v, value = holder[key];
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diff changeset
416 if (value && typeof value === 'object') {
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diff changeset
417 for (k in value) {
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diff changeset
418 if (Object.hasOwnProperty.call(value, k)) {
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diff changeset
419 v = walk(value, k);
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diff changeset
420 if (v !== undefined) {
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diff changeset
421 value[k] = v;
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422 } else {
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diff changeset
423 delete value[k];
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parents:
diff changeset
424 }
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diff changeset
425 }
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426 }
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427 }
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428 return reviver.call(holder, key, value);
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diff changeset
429 }
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parents:
diff changeset
430
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diff changeset
431
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432 // Parsing happens in four stages. In the first stage, we replace certain
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433 // Unicode characters with escape sequences. JavaScript handles many characters
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434 // incorrectly, either silently deleting them, or treating them as line endings.
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435
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436 text = String(text);
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437 cx.lastIndex = 0;
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438 if (cx.test(text)) {
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439 text = text.replace(cx, function (a) {
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440 return '\\u' +
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441 ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
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442 });
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443 }
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444
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445 // In the second stage, we run the text against regular expressions that look
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446 // for non-JSON patterns. We are especially concerned with '()' and 'new'
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447 // because they can cause invocation, and '=' because it can cause mutation.
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448 // But just to be safe, we want to reject all unexpected forms.
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449
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450 // We split the second stage into 4 regexp operations in order to work around
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451 // crippling inefficiencies in IE's and Safari's regexp engines. First we
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452 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
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453 // replace all simple value tokens with ']' characters. Third, we delete all
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454 // open brackets that follow a colon or comma or that begin the text. Finally,
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455 // we look to see that the remaining characters are only whitespace or ']' or
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456 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
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457
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458 if (/^[\],:{}\s]*$/.
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459 test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
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460 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
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461 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
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462
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463 // In the third stage we use the eval function to compile the text into a
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464 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
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465 // in JavaScript: it can begin a block or an object literal. We wrap the text
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466 // in parens to eliminate the ambiguity.
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467
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468 j = eval('(' + text + ')');
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469
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470 // In the optional fourth stage, we recursively walk the new structure, passing
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471 // each name/value pair to a reviver function for possible transformation.
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472
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473 return typeof reviver === 'function' ?
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474 walk({'': j}, '') : j;
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475 }
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476
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477 // If the text is not JSON parseable, then a SyntaxError is thrown.
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478
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479 throw new SyntaxError('JSON.parse');
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480 };
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481 }
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482 }());