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 ' '), |
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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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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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396 | }; |
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397 | } |
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398 | |
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399 | |
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400 | // If the JSON object does not yet have a parse method, give it one. |
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401 | |
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402 | if (typeof JSON.parse !== 'function') { |
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403 | JSON.parse = function (text, reviver) { |
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404 | |
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405 | // The parse method takes a text and an optional reviver function, and returns |
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406 | // a JavaScript value if the text is a valid JSON text. |
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407 | |
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408 | var j; |
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409 | |
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410 | function walk(holder, key) { |
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411 | |
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412 | // The walk method is used to recursively walk the resulting structure so |
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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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416 | if (value && typeof value === 'object') { |
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417 | for (k in value) { |
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418 | if (Object.hasOwnProperty.call(value, k)) { |
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419 | v = walk(value, k); |
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420 | if (v !== undefined) { |
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421 | value[k] = v; |
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422 | } else { |
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423 | delete value[k]; |
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424 | } |
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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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429 | } |
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430 | |
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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 | }()); |
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