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1 /* |
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2 http://www.JSON.org/json2.js |
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3 2008-11-19 |
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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 This file creates a global JSON object containing two methods: stringify |
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12 and parse. |
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13 |
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14 JSON.stringify(value, replacer, space) |
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15 value any JavaScript value, usually an object or array. |
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16 |
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17 replacer an optional parameter that determines how object |
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18 values are stringified for objects. It can be a |
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19 function or an array of strings. |
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20 |
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21 space an optional parameter that specifies the indentation |
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22 of nested structures. If it is omitted, the text will |
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23 be packed without extra whitespace. If it is a number, |
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24 it will specify the number of spaces to indent at each |
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25 level. If it is a string (such as '\t' or ' '), |
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26 it contains the characters used to indent at each level. |
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27 |
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28 This method produces a JSON text from a JavaScript value. |
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29 |
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30 When an object value is found, if the object contains a toJSON |
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31 method, its toJSON method will be called and the result will be |
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32 stringified. A toJSON method does not serialize: it returns the |
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33 value represented by the name/value pair that should be serialized, |
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34 or undefined if nothing should be serialized. The toJSON method |
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35 will be passed the key associated with the value, and this will be |
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36 bound to the object holding the key. |
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37 |
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38 For example, this would serialize Dates as ISO strings. |
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39 |
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40 Date.prototype.toJSON = function (key) { |
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41 function f(n) { |
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42 // Format integers to have at least two digits. |
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43 return n < 10 ? '0' + n : n; |
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44 } |
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45 |
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46 return this.getUTCFullYear() + '-' + |
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47 f(this.getUTCMonth() + 1) + '-' + |
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48 f(this.getUTCDate()) + 'T' + |
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49 f(this.getUTCHours()) + ':' + |
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50 f(this.getUTCMinutes()) + ':' + |
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51 f(this.getUTCSeconds()) + 'Z'; |
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52 }; |
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53 |
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54 You can provide an optional replacer method. It will be passed the |
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55 key and value of each member, with this bound to the containing |
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56 object. The value that is returned from your method will be |
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57 serialized. If your method returns undefined, then the member will |
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58 be excluded from the serialization. |
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59 |
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60 If the replacer parameter is an array of strings, then it will be |
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61 used to select the members to be serialized. It filters the results |
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62 such that only members with keys listed in the replacer array are |
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63 stringified. |
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64 |
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65 Values that do not have JSON representations, such as undefined or |
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66 functions, will not be serialized. Such values in objects will be |
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67 dropped; in arrays they will be replaced with null. You can use |
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68 a replacer function to replace those with JSON values. |
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69 JSON.stringify(undefined) returns undefined. |
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70 |
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71 The optional space parameter produces a stringification of the |
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72 value that is filled with line breaks and indentation to make it |
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73 easier to read. |
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74 |
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75 If the space parameter is a non-empty string, then that string will |
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76 be used for indentation. If the space parameter is a number, then |
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77 the indentation will be that many spaces. |
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78 |
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79 Example: |
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80 |
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81 text = JSON.stringify(['e', {pluribus: 'unum'}]); |
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82 // text is '["e",{"pluribus":"unum"}]' |
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83 |
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84 |
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85 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); |
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86 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' |
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87 |
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88 text = JSON.stringify([new Date()], function (key, value) { |
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89 return this[key] instanceof Date ? |
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90 'Date(' + this[key] + ')' : value; |
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91 }); |
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92 // text is '["Date(---current time---)"]' |
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93 |
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94 |
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95 JSON.parse(text, reviver) |
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96 This method parses a JSON text to produce an object or array. |
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97 It can throw a SyntaxError exception. |
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98 |
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99 The optional reviver parameter is a function that can filter and |
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100 transform the results. It receives each of the keys and values, |
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101 and its return value is used instead of the original value. |
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102 If it returns what it received, then the structure is not modified. |
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103 If it returns undefined then the member is deleted. |
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104 |
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105 Example: |
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106 |
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107 // Parse the text. Values that look like ISO date strings will |
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108 // be converted to Date objects. |
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109 |
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110 myData = JSON.parse(text, function (key, value) { |
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111 var a; |
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112 if (typeof value === 'string') { |
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113 a = |
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114 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); |
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115 if (a) { |
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116 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], |
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117 +a[5], +a[6])); |
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118 } |
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119 } |
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120 return value; |
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121 }); |
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122 |
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123 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { |
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124 var d; |
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125 if (typeof value === 'string' && |
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126 value.slice(0, 5) === 'Date(' && |
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127 value.slice(-1) === ')') { |
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128 d = new Date(value.slice(5, -1)); |
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129 if (d) { |
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130 return d; |
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131 } |
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132 } |
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133 return value; |
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134 }); |
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135 |
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136 |
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137 This is a reference implementation. You are free to copy, modify, or |
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138 redistribute. |
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139 |
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140 This code should be minified before deployment. |
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141 See http://javascript.crockford.com/jsmin.html |
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142 |
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143 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO |
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144 NOT CONTROL. |
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145 */ |
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146 |
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147 /*jslint evil: true */ |
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148 |
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149 /*global JSON */ |
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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 // Create a JSON object only if one does not already exist. We create the |
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159 // methods in a closure to avoid creating global variables. |
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160 |
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161 if (!this.JSON) { |
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162 JSON = {}; |
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163 } |
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164 (function () { |
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165 |
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166 function f(n) { |
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167 // Format integers to have at least two digits. |
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168 return n < 10 ? '0' + n : n; |
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169 } |
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170 |
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171 if (typeof Date.prototype.toJSON !== 'function') { |
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172 |
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173 Date.prototype.toJSON = function (key) { |
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174 |
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175 return this.getUTCFullYear() + '-' + |
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176 f(this.getUTCMonth() + 1) + '-' + |
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177 f(this.getUTCDate()) + 'T' + |
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178 f(this.getUTCHours()) + ':' + |
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179 f(this.getUTCMinutes()) + ':' + |
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180 f(this.getUTCSeconds()) + 'Z'; |
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181 }; |
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182 |
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183 String.prototype.toJSON = |
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184 Number.prototype.toJSON = |
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185 Boolean.prototype.toJSON = function (key) { |
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186 return this.valueOf(); |
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187 }; |
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188 } |
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189 |
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190 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, |
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191 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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192 gap, |
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193 indent, |
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194 meta = { // table of character substitutions |
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195 '\b': '\\b', |
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196 '\t': '\\t', |
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197 '\n': '\\n', |
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198 '\f': '\\f', |
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199 '\r': '\\r', |
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200 '"' : '\\"', |
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201 '\\': '\\\\' |
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202 }, |
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203 rep; |
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204 |
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205 |
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206 function quote(string) { |
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207 |
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208 // If the string contains no control characters, no quote characters, and no |
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209 // backslash characters, then we can safely slap some quotes around it. |
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210 // Otherwise we must also replace the offending characters with safe escape |
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211 // sequences. |
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212 |
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213 escapable.lastIndex = 0; |
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214 return escapable.test(string) ? |
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215 '"' + string.replace(escapable, function (a) { |
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216 var c = meta[a]; |
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217 return typeof c === 'string' ? c : |
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218 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
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219 }) + '"' : |
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220 '"' + string + '"'; |
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221 } |
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222 |
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223 |
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224 function str(key, holder) { |
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225 |
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226 // Produce a string from holder[key]. |
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227 |
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228 var i, // The loop counter. |
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229 k, // The member key. |
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230 v, // The member value. |
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231 length, |
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232 mind = gap, |
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233 partial, |
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234 value = holder[key]; |
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235 |
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236 // If the value has a toJSON method, call it to obtain a replacement value. |
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237 |
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238 if (value && typeof value === 'object' && |
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239 typeof value.toJSON === 'function') { |
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240 value = value.toJSON(key); |
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241 } |
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242 |
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243 // If we were called with a replacer function, then call the replacer to |
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244 // obtain a replacement value. |
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245 |
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246 if (typeof rep === 'function') { |
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247 value = rep.call(holder, key, value); |
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248 } |
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249 |
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250 // What happens next depends on the value's type. |
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251 |
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252 switch (typeof value) { |
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253 case 'string': |
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254 return quote(value); |
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255 |
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256 case 'number': |
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257 |
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258 // JSON numbers must be finite. Encode non-finite numbers as null. |
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259 |
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260 return isFinite(value) ? String(value) : 'null'; |
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261 |
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262 case 'boolean': |
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263 case 'null': |
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264 |
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265 // If the value is a boolean or null, convert it to a string. Note: |
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266 // typeof null does not produce 'null'. The case is included here in |
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267 // the remote chance that this gets fixed someday. |
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268 |
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269 return String(value); |
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270 |
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271 // If the type is 'object', we might be dealing with an object or an array or |
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272 // null. |
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273 |
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274 case 'object': |
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275 |
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276 // Due to a specification blunder in ECMAScript, typeof null is 'object', |
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277 // so watch out for that case. |
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278 |
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279 if (!value) { |
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280 return 'null'; |
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281 } |
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282 |
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283 // Make an array to hold the partial results of stringifying this object value. |
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284 |
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285 gap += indent; |
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286 partial = []; |
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287 |
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288 // Is the value an array? |
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289 |
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290 if (Object.prototype.toString.apply(value) === '[object Array]') { |
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291 |
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292 // The value is an array. Stringify every element. Use null as a placeholder |
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293 // for non-JSON values. |
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294 |
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295 length = value.length; |
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296 for (i = 0; i < length; i += 1) { |
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297 partial[i] = str(i, value) || 'null'; |
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298 } |
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299 |
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300 // Join all of the elements together, separated with commas, and wrap them in |
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301 // brackets. |
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302 |
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303 v = partial.length === 0 ? '[]' : |
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304 gap ? '[\n' + gap + |
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305 partial.join(',\n' + gap) + '\n' + |
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306 mind + ']' : |
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307 '[' + partial.join(',') + ']'; |
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308 gap = mind; |
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309 return v; |
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310 } |
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311 |
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312 // If the replacer is an array, use it to select the members to be stringified. |
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313 |
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314 if (rep && typeof rep === 'object') { |
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315 length = rep.length; |
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316 for (i = 0; i < length; i += 1) { |
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317 k = rep[i]; |
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318 if (typeof k === 'string') { |
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319 v = str(k, value); |
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320 if (v) { |
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321 partial.push(quote(k) + (gap ? ': ' : ':') + v); |
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322 } |
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323 } |
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324 } |
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325 } else { |
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326 |
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327 // Otherwise, iterate through all of the keys in the object. |
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328 |
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329 for (k in value) { |
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330 if (Object.hasOwnProperty.call(value, k)) { |
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331 v = str(k, value); |
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332 if (v) { |
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333 partial.push(quote(k) + (gap ? ': ' : ':') + v); |
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334 } |
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335 } |
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336 } |
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337 } |
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338 |
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339 // Join all of the member texts together, separated with commas, |
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340 // and wrap them in braces. |
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341 |
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342 v = partial.length === 0 ? '{}' : |
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343 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + |
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344 mind + '}' : '{' + partial.join(',') + '}'; |
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345 gap = mind; |
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346 return v; |
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347 } |
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348 } |
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349 |
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350 // If the JSON object does not yet have a stringify method, give it one. |
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351 |
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352 if (typeof JSON.stringify !== 'function') { |
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353 JSON.stringify = function (value, replacer, space) { |
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354 |
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355 // The stringify method takes a value and an optional replacer, and an optional |
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356 // space parameter, and returns a JSON text. The replacer can be a function |
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357 // that can replace values, or an array of strings that will select the keys. |
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358 // A default replacer method can be provided. Use of the space parameter can |
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359 // produce text that is more easily readable. |
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360 |
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361 var i; |
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362 gap = ''; |
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363 indent = ''; |
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364 |
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365 // If the space parameter is a number, make an indent string containing that |
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366 // many spaces. |
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367 |
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368 if (typeof space === 'number') { |
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369 for (i = 0; i < space; i += 1) { |
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370 indent += ' '; |
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371 } |
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372 |
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373 // If the space parameter is a string, it will be used as the indent string. |
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374 |
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375 } else if (typeof space === 'string') { |
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376 indent = space; |
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377 } |
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378 |
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379 // If there is a replacer, it must be a function or an array. |
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380 // Otherwise, throw an error. |
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381 |
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382 rep = replacer; |
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383 if (replacer && typeof replacer !== 'function' && |
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384 (typeof replacer !== 'object' || |
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385 typeof replacer.length !== 'number')) { |
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386 throw new Error('JSON.stringify'); |
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387 } |
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388 |
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389 // Make a fake root object containing our value under the key of ''. |
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390 // Return the result of stringifying the value. |
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391 |
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392 return str('', {'': value}); |
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393 }; |
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394 } |
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395 |
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396 |
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397 // If the JSON object does not yet have a parse method, give it one. |
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398 |
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399 if (typeof JSON.parse !== 'function') { |
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400 JSON.parse = function (text, reviver) { |
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401 |
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402 // The parse method takes a text and an optional reviver function, and returns |
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403 // a JavaScript value if the text is a valid JSON text. |
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404 |
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405 var j; |
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406 |
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407 function walk(holder, key) { |
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408 |
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409 // The walk method is used to recursively walk the resulting structure so |
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410 // that modifications can be made. |
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411 |
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412 var k, v, value = holder[key]; |
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413 if (value && typeof value === 'object') { |
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414 for (k in value) { |
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415 if (Object.hasOwnProperty.call(value, k)) { |
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416 v = walk(value, k); |
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417 if (v !== undefined) { |
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418 value[k] = v; |
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419 } else { |
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420 delete value[k]; |
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421 } |
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422 } |
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423 } |
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424 } |
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425 return reviver.call(holder, key, value); |
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426 } |
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427 |
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428 |
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429 // Parsing happens in four stages. In the first stage, we replace certain |
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430 // Unicode characters with escape sequences. JavaScript handles many characters |
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431 // incorrectly, either silently deleting them, or treating them as line endings. |
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432 |
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433 cx.lastIndex = 0; |
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434 if (cx.test(text)) { |
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435 text = text.replace(cx, function (a) { |
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436 return '\\u' + |
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437 ('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
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438 }); |
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439 } |
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440 |
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441 // In the second stage, we run the text against regular expressions that look |
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442 // for non-JSON patterns. We are especially concerned with '()' and 'new' |
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443 // because they can cause invocation, and '=' because it can cause mutation. |
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444 // But just to be safe, we want to reject all unexpected forms. |
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445 |
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446 // We split the second stage into 4 regexp operations in order to work around |
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447 // crippling inefficiencies in IE's and Safari's regexp engines. First we |
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448 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we |
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449 // replace all simple value tokens with ']' characters. Third, we delete all |
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450 // open brackets that follow a colon or comma or that begin the text. Finally, |
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451 // we look to see that the remaining characters are only whitespace or ']' or |
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452 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. |
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453 |
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454 if (/^[\],:{}\s]*$/. |
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455 test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@'). |
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456 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']'). |
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457 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { |
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458 |
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459 // In the third stage we use the eval function to compile the text into a |
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460 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity |
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461 // in JavaScript: it can begin a block or an object literal. We wrap the text |
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462 // in parens to eliminate the ambiguity. |
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463 |
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464 j = eval('(' + text + ')'); |
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465 |
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466 // In the optional fourth stage, we recursively walk the new structure, passing |
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467 // each name/value pair to a reviver function for possible transformation. |
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468 |
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469 return typeof reviver === 'function' ? |
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470 walk({'': j}, '') : j; |
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471 } |
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472 |
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473 // If the text is not JSON parseable, then a SyntaxError is thrown. |
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474 |
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475 throw new SyntaxError('JSON.parse'); |
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476 }; |
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477 } |
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478 })(); |