1 | /*
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2 | json2.js
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3 | 2014-02-04
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4 |
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5 | Public Domain.
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6 |
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7 | NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
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8 |
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9 | See http://www.JSON.org/js.html
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10 |
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11 |
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12 | This code should be minified before deployment.
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13 | See http://javascript.crockford.com/jsmin.html
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14 |
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15 | USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
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16 | NOT CONTROL.
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17 |
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18 |
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19 | This file creates a global JSON object containing two methods: stringify
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20 | and parse.
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21 |
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22 | JSON.stringify(value, replacer, space)
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23 | value any JavaScript value, usually an object or array.
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24 |
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25 | replacer an optional parameter that determines how object
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26 | values are stringified for objects. It can be a
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27 | function or an array of strings.
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28 |
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29 | space an optional parameter that specifies the indentation
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30 | of nested structures. If it is omitted, the text will
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31 | be packed without extra whitespace. If it is a number,
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32 | it will specify the number of spaces to indent at each
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33 | level. If it is a string (such as '\t' or ' '),
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34 | it contains the characters used to indent at each level.
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35 |
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36 | This method produces a JSON text from a JavaScript value.
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37 |
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38 | When an object value is found, if the object contains a toJSON
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39 | method, its toJSON method will be called and the result will be
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40 | stringified. A toJSON method does not serialize: it returns the
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41 | value represented by the name/value pair that should be serialized,
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42 | or undefined if nothing should be serialized. The toJSON method
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43 | will be passed the key associated with the value, and this will be
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44 | bound to the value
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45 |
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46 | For example, this would serialize Dates as ISO strings.
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47 |
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48 | Date.prototype.toJSON = function (key) {
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49 | function f(n) {
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50 | // Format integers to have at least two digits.
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51 | return n < 10 ? '0' + n : n;
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52 | }
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53 |
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54 | return this.getUTCFullYear() + '-' +
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55 | f(this.getUTCMonth() + 1) + '-' +
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56 | f(this.getUTCDate()) + 'T' +
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57 | f(this.getUTCHours()) + ':' +
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58 | f(this.getUTCMinutes()) + ':' +
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59 | f(this.getUTCSeconds()) + 'Z';
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60 | };
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61 |
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62 | You can provide an optional replacer method. It will be passed the
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63 | key and value of each member, with this bound to the containing
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64 | object. The value that is returned from your method will be
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65 | serialized. If your method returns undefined, then the member will
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66 | be excluded from the serialization.
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67 |
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68 | If the replacer parameter is an array of strings, then it will be
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69 | used to select the members to be serialized. It filters the results
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70 | such that only members with keys listed in the replacer array are
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71 | stringified.
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72 |
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73 | Values that do not have JSON representations, such as undefined or
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74 | functions, will not be serialized. Such values in objects will be
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75 | dropped; in arrays they will be replaced with null. You can use
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76 | a replacer function to replace those with JSON values.
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77 | JSON.stringify(undefined) returns undefined.
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78 |
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79 | The optional space parameter produces a stringification of the
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80 | value that is filled with line breaks and indentation to make it
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81 | easier to read.
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82 |
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83 | If the space parameter is a non-empty string, then that string will
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84 | be used for indentation. If the space parameter is a number, then
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85 | the indentation will be that many spaces.
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86 |
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87 | Example:
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88 |
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89 | text = JSON.stringify(['e', {pluribus: 'unum'}]);
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90 | // text is '["e",{"pluribus":"unum"}]'
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91 |
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92 |
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93 | text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
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94 | // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
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95 |
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96 | text = JSON.stringify([new Date()], function (key, value) {
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97 | return this[key] instanceof Date ?
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98 | 'Date(' + this[key] + ')' : value;
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99 | });
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100 | // text is '["Date(---current time---)"]'
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101 |
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102 |
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103 | JSON.parse(text, reviver)
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104 | This method parses a JSON text to produce an object or array.
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105 | It can throw a SyntaxError exception.
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106 |
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107 | The optional reviver parameter is a function that can filter and
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108 | transform the results. It receives each of the keys and values,
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109 | and its return value is used instead of the original value.
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110 | If it returns what it received, then the structure is not modified.
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111 | If it returns undefined then the member is deleted.
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112 |
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113 | Example:
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114 |
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115 | // Parse the text. Values that look like ISO date strings will
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116 | // be converted to Date objects.
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117 |
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118 | myData = JSON.parse(text, function (key, value) {
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119 | var a;
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120 | if (typeof value === 'string') {
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121 | a =
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122 | /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
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123 | if (a) {
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124 | return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
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125 | +a[5], +a[6]));
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126 | }
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127 | }
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128 | return value;
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129 | });
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130 |
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131 | myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
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132 | var d;
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133 | if (typeof value === 'string' &&
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134 | value.slice(0, 5) === 'Date(' &&
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135 | value.slice(-1) === ')') {
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136 | d = new Date(value.slice(5, -1));
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137 | if (d) {
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138 | return d;
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139 | }
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140 | }
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141 | return value;
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142 | });
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143 |
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144 |
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145 | This is a reference implementation. You are free to copy, modify, or
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146 | redistribute.
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147 | */
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148 |
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149 | /*jslint evil: true, regexp: true */
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150 |
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151 | /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
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152 | call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
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153 | getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
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154 | lastIndex, length, parse, prototype, push, replace, slice, stringify,
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155 | test, toJSON, toString, valueOf
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156 | */
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157 |
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158 |
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159 | // Create a JSON object only if one does not already exist. We create the
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160 | // methods in a closure to avoid creating global variables.
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161 |
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162 | if (typeof JSON !== 'object') {
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163 | 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 |
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169 | function f(n) {
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170 | // Format integers to have at least two digits.
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171 | return n < 10 ? '0' + n : n;
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172 | }
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173 |
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174 | if (typeof Date.prototype.toJSON !== 'function') {
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175 |
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176 | Date.prototype.toJSON = function () {
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177 |
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178 | return isFinite(this.valueOf())
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179 | ? this.getUTCFullYear() + '-' +
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180 | f(this.getUTCMonth() + 1) + '-' +
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181 | f(this.getUTCDate()) + 'T' +
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182 | f(this.getUTCHours()) + ':' +
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183 | f(this.getUTCMinutes()) + ':' +
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184 | f(this.getUTCSeconds()) + 'Z'
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185 | : null;
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186 | };
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187 |
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188 | String.prototype.toJSON =
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189 | Number.prototype.toJSON =
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190 | Boolean.prototype.toJSON = function () {
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191 | return this.valueOf();
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192 | };
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193 | }
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194 |
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195 | var cx,
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196 | escapable,
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197 | gap,
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198 | indent,
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199 | meta,
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200 | rep;
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201 |
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202 |
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203 | function quote(string) {
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204 |
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205 | // If the string contains no control characters, no quote characters, and no
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206 | // backslash characters, then we can safely slap some quotes around it.
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207 | // Otherwise we must also replace the offending characters with safe escape
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208 | // sequences.
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209 |
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210 | escapable.lastIndex = 0;
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211 | return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
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212 | var c = meta[a];
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213 | return typeof c === 'string'
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214 | ? c
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215 | : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
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216 | }) + '"' : '"' + string + '"';
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217 | }
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218 |
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219 |
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220 | function str(key, holder) {
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221 |
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222 | // Produce a string from holder[key].
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223 |
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224 | var i, // The loop counter.
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225 | k, // The member key.
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226 | v, // The member value.
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227 | length,
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228 | mind = gap,
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229 | partial,
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230 | value = holder[key];
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231 |
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232 | // If the value has a toJSON method, call it to obtain a replacement value.
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233 |
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234 | if (value && typeof value === 'object' &&
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235 | typeof value.toJSON === 'function') {
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236 | value = value.toJSON(key);
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237 | }
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238 |
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239 | // If we were called with a replacer function, then call the replacer to
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240 | // obtain a replacement value.
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241 |
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242 | if (typeof rep === 'function') {
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243 | value = rep.call(holder, key, value);
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244 | }
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245 |
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246 | // What happens next depends on the value's type.
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247 |
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248 | switch (typeof value) {
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249 | case 'string':
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250 | return quote(value);
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251 |
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252 | case 'number':
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253 |
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254 | // JSON numbers must be finite. Encode non-finite numbers as null.
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255 |
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256 | return isFinite(value) ? String(value) : 'null';
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257 |
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258 | case 'boolean':
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259 | case 'null':
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260 |
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261 | // If the value is a boolean or null, convert it to a string. Note:
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262 | // typeof null does not produce 'null'. The case is included here in
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263 | // the remote chance that this gets fixed someday.
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264 |
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265 | return String(value);
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266 |
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267 | // If the type is 'object', we might be dealing with an object or an array or
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268 | // null.
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269 |
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270 | case 'object':
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271 |
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272 | // Due to a specification blunder in ECMAScript, typeof null is 'object',
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273 | // so watch out for that case.
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274 |
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275 | if (!value) {
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276 | return 'null';
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277 | }
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278 |
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279 | // Make an array to hold the partial results of stringifying this object value.
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280 |
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281 | gap += indent;
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282 | partial = [];
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283 |
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284 | // Is the value an array?
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285 |
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286 | if (Object.prototype.toString.apply(value) === '[object Array]') {
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287 |
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288 | // The value is an array. Stringify every element. Use null as a placeholder
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289 | // for non-JSON values.
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290 |
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291 | length = value.length;
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292 | for (i = 0; i < length; i += 1) {
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293 | partial[i] = str(i, value) || 'null';
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294 | }
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295 |
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296 | // Join all of the elements together, separated with commas, and wrap them in
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297 | // brackets.
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298 |
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299 | v = partial.length === 0
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300 | ? '[]'
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301 | : gap
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302 | ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']'
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303 | : '[' + partial.join(',') + ']';
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304 | gap = mind;
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305 | return v;
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306 | }
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307 |
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308 | // If the replacer is an array, use it to select the members to be stringified.
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309 |
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310 | if (rep && typeof rep === 'object') {
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311 | length = rep.length;
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312 | for (i = 0; i < length; i += 1) {
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313 | if (typeof rep[i] === 'string') {
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314 | k = rep[i];
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315 | v = str(k, value);
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316 | if (v) {
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317 | partial.push(quote(k) + (gap ? ': ' : ':') + v);
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318 | }
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319 | }
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320 | }
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321 | } else {
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322 |
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323 | // Otherwise, iterate through all of the keys in the object.
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324 |
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325 | for (k in value) {
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326 | if (Object.prototype.hasOwnProperty.call(value, k)) {
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327 | v = str(k, value);
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328 | if (v) {
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329 | partial.push(quote(k) + (gap ? ': ' : ':') + v);
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330 | }
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331 | }
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332 | }
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333 | }
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334 |
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335 | // Join all of the member texts together, separated with commas,
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336 | // and wrap them in braces.
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337 |
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338 | v = partial.length === 0
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339 | ? '{}'
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340 | : gap
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341 | ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}'
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342 | : '{' + partial.join(',') + '}';
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343 | gap = mind;
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344 | return v;
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345 | }
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346 | }
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347 |
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348 | // If the JSON object does not yet have a stringify method, give it one.
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349 |
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350 | if (typeof JSON.stringify !== 'function') {
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351 | 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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352 | meta = { // table of character substitutions
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353 | '\b': '\\b',
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354 | '\t': '\\t',
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355 | '\n': '\\n',
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356 | '\f': '\\f',
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357 | '\r': '\\r',
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358 | '"' : '\\"',
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359 | '\\': '\\\\'
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360 | };
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361 | JSON.stringify = function (value, replacer, space) {
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362 |
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363 | // The stringify method takes a value and an optional replacer, and an optional
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364 | // space parameter, and returns a JSON text. The replacer can be a function
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365 | // that can replace values, or an array of strings that will select the keys.
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366 | // A default replacer method can be provided. Use of the space parameter can
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367 | // produce text that is more easily readable.
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368 |
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369 | var i;
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370 | gap = '';
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371 | indent = '';
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372 |
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373 | // If the space parameter is a number, make an indent string containing that
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374 | // many spaces.
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375 |
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376 | if (typeof space === 'number') {
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377 | for (i = 0; i < space; i += 1) {
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378 | indent += ' ';
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379 | }
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380 |
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381 | // If the space parameter is a string, it will be used as the indent string.
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382 |
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383 | } else if (typeof space === 'string') {
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384 | indent = space;
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385 | }
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386 |
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387 | // If there is a replacer, it must be a function or an array.
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388 | // Otherwise, throw an error.
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389 |
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390 | rep = replacer;
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391 | if (replacer && typeof replacer !== 'function' &&
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392 | (typeof replacer !== 'object' ||
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393 | typeof replacer.length !== 'number')) {
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394 | throw new Error('JSON.stringify');
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395 | }
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396 |
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397 | // Make a fake root object containing our value under the key of ''.
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398 | // Return the result of stringifying the value.
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399 |
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400 | return str('', {'': value});
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401 | };
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402 | }
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403 |
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404 |
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405 | // If the JSON object does not yet have a parse method, give it one.
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406 |
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407 | if (typeof JSON.parse !== 'function') {
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408 | cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
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409 | JSON.parse = function (text, reviver) {
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410 |
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411 | // The parse method takes a text and an optional reviver function, and returns
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412 | // a JavaScript value if the text is a valid JSON text.
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413 |
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414 | var j;
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415 |
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416 | function walk(holder, key) {
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417 |
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418 | // The walk method is used to recursively walk the resulting structure so
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419 | // that modifications can be made.
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420 |
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421 | var k, v, value = holder[key];
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422 | if (value && typeof value === 'object') {
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423 | for (k in value) {
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424 | if (Object.prototype.hasOwnProperty.call(value, k)) {
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425 | v = walk(value, k);
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426 | if (v !== undefined) {
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427 | value[k] = v;
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428 | } else {
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429 | delete value[k];
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430 | }
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431 | }
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432 | }
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433 | }
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434 | return reviver.call(holder, key, value);
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435 | }
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436 |
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437 |
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438 | // Parsing happens in four stages. In the first stage, we replace certain
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439 | // Unicode characters with escape sequences. JavaScript handles many characters
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440 | // incorrectly, either silently deleting them, or treating them as line endings.
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441 |
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442 | text = String(text);
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443 | cx.lastIndex = 0;
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444 | if (cx.test(text)) {
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445 | text = text.replace(cx, function (a) {
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446 | return '\\u' +
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447 | ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
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448 | });
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449 | }
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450 |
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451 | // In the second stage, we run the text against regular expressions that look
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452 | // for non-JSON patterns. We are especially concerned with '()' and 'new'
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453 | // because they can cause invocation, and '=' because it can cause mutation.
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454 | // But just to be safe, we want to reject all unexpected forms.
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455 |
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456 | // We split the second stage into 4 regexp operations in order to work around
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457 | // crippling inefficiencies in IE's and Safari's regexp engines. First we
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458 | // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
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459 | // replace all simple value tokens with ']' characters. Third, we delete all
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460 | // open brackets that follow a colon or comma or that begin the text. Finally,
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461 | // we look to see that the remaining characters are only whitespace or ']' or
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462 | // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
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463 |
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464 | if (/^[\],:{}\s]*$/
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465 | .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
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466 | .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
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467 | .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
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468 |
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469 | // In the third stage we use the eval function to compile the text into a
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470 | // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
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471 | // in JavaScript: it can begin a block or an object literal. We wrap the text
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472 | // in parens to eliminate the ambiguity.
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473 |
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474 | j = eval('(' + text + ')');
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475 |
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476 | // In the optional fourth stage, we recursively walk the new structure, passing
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477 | // each name/value pair to a reviver function for possible transformation.
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478 |
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479 | return typeof reviver === 'function'
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480 | ? walk({'': j}, '')
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481 | : j;
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482 | }
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483 |
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484 | // If the text is not JSON parseable, then a SyntaxError is thrown.
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485 |
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486 | throw new SyntaxError('JSON.parse');
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487 | };
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488 | }
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489 | }());
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