mirror of
https://github.com/gnh1201/welsonjs.git
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531 lines
18 KiB
JavaScript
531 lines
18 KiB
JavaScript
// json2.js
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// 2017-06-12
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// Public Domain.
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// NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
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// USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
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// NOT CONTROL.
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// This file creates a global JSON object containing two methods: stringify
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// and parse. This file provides the ES5 JSON capability to ES3 systems.
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// If a project might run on IE8 or earlier, then this file should be included.
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// This file does nothing on ES5 systems.
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// JSON.stringify(value, replacer, space)
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// value any JavaScript value, usually an object or array.
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// replacer an optional parameter that determines how object
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// values are stringified for objects. It can be a
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// function or an array of strings.
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// space an optional parameter that specifies the indentation
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// of nested structures. If it is omitted, the text will
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// be packed without extra whitespace. If it is a number,
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// it will specify the number of spaces to indent at each
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// level. If it is a string (such as "\t" or " "),
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// it contains the characters used to indent at each level.
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// This method produces a JSON text from a JavaScript value.
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// When an object value is found, if the object contains a toJSON
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// method, its toJSON method will be called and the result will be
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// stringified. A toJSON method does not serialize: it returns the
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// value represented by the name/value pair that should be serialized,
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// or undefined if nothing should be serialized. The toJSON method
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// will be passed the key associated with the value, and this will be
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// bound to the value.
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// For example, this would serialize Dates as ISO strings.
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// Date.prototype.toJSON = function (key) {
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// function f(n) {
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// // Format integers to have at least two digits.
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// return (n < 10)
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// ? "0" + n
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// : n;
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// }
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// return this.getUTCFullYear() + "-" +
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// f(this.getUTCMonth() + 1) + "-" +
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// f(this.getUTCDate()) + "T" +
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// f(this.getUTCHours()) + ":" +
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// f(this.getUTCMinutes()) + ":" +
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// f(this.getUTCSeconds()) + "Z";
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// };
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// You can provide an optional replacer method. It will be passed the
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// key and value of each member, with this bound to the containing
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// object. The value that is returned from your method will be
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// serialized. If your method returns undefined, then the member will
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// be excluded from the serialization.
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// If the replacer parameter is an array of strings, then it will be
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// used to select the members to be serialized. It filters the results
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// such that only members with keys listed in the replacer array are
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// stringified.
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// Values that do not have JSON representations, such as undefined or
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// functions, will not be serialized. Such values in objects will be
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// dropped; in arrays they will be replaced with null. You can use
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// a replacer function to replace those with JSON values.
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// JSON.stringify(undefined) returns undefined.
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// The optional space parameter produces a stringification of the
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// value that is filled with line breaks and indentation to make it
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// easier to read.
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// If the space parameter is a non-empty string, then that string will
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// be used for indentation. If the space parameter is a number, then
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// the indentation will be that many spaces.
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// Example:
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// text = JSON.stringify(["e", {pluribus: "unum"}]);
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// // text is '["e",{"pluribus":"unum"}]'
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// text = JSON.stringify(["e", {pluribus: "unum"}], null, "\t");
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// // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
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// text = JSON.stringify([new Date()], function (key, value) {
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// return this[key] instanceof Date
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// ? "Date(" + this[key] + ")"
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// : value;
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// });
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// // text is '["Date(---current time---)"]'
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// JSON.parse(text, reviver)
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// This method parses a JSON text to produce an object or array.
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// It can throw a SyntaxError exception.
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// The optional reviver parameter is a function that can filter and
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// transform the results. It receives each of the keys and values,
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// and its return value is used instead of the original value.
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// If it returns what it received, then the structure is not modified.
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// If it returns undefined then the member is deleted.
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// Example:
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// // Parse the text. Values that look like ISO date strings will
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// // be converted to Date objects.
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// myData = JSON.parse(text, function (key, value) {
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// var a;
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// if (typeof value === "string") {
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// a =
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// /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
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// if (a) {
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// return new Date(Date.UTC(
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// +a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6]
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// ));
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// }
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// return value;
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// }
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// });
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// myData = JSON.parse(
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// "[\"Date(09/09/2001)\"]",
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// function (key, value) {
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// var d;
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// if (
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// typeof value === "string"
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// && value.slice(0, 5) === "Date("
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// && value.slice(-1) === ")"
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// ) {
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// d = new Date(value.slice(5, -1));
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// if (d) {
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// return d;
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// }
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// }
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// return value;
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// }
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// );
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// This is a reference implementation. You are free to copy, modify, or
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// redistribute.
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/*jslint
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eval, for, this
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*/
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/*property
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JSON, apply, call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
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getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
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lastIndex, length, parse, prototype, push, replace, slice, stringify,
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test, toJSON, toString, valueOf
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*/
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// Create a JSON object only if one does not already exist. We create the
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// methods in a closure to avoid creating global variables.
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if (typeof JSON !== "object") {
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JSON = {};
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}
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(function () {
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"use strict";
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var rx_one = /^[\],:{}\s]*$/;
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var rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
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var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
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var rx_four = /(?:^|:|,)(?:\s*\[)+/g;
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var rx_escapable = /[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
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var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
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function f(n) {
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// Format integers to have at least two digits.
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return (n < 10)
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? "0" + n
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: n;
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}
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function this_value() {
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return this.valueOf();
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}
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if (typeof Date.prototype.toJSON !== "function") {
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Date.prototype.toJSON = function () {
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return isFinite(this.valueOf())
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? (
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this.getUTCFullYear()
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+ "-"
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+ f(this.getUTCMonth() + 1)
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+ "-"
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+ f(this.getUTCDate())
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+ "T"
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+ f(this.getUTCHours())
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+ ":"
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+ f(this.getUTCMinutes())
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+ ":"
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+ f(this.getUTCSeconds())
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+ "Z"
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)
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: null;
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};
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Boolean.prototype.toJSON = this_value;
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Number.prototype.toJSON = this_value;
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String.prototype.toJSON = this_value;
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}
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var gap;
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var indent;
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var meta;
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var rep;
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function quote(string) {
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// If the string contains no control characters, no quote characters, and no
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// backslash characters, then we can safely slap some quotes around it.
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// Otherwise we must also replace the offending characters with safe escape
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// sequences.
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rx_escapable.lastIndex = 0;
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return rx_escapable.test(string)
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? "\"" + string.replace(rx_escapable, function (a) {
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var c = meta[a];
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return typeof c === "string"
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? c
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: "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
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}) + "\""
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: "\"" + string + "\"";
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}
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function str(key, holder) {
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// Produce a string from holder[key].
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var i; // The loop counter.
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var k; // The member key.
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var v; // The member value.
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var length;
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var mind = gap;
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var partial;
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var value = holder[key];
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// If the value has a toJSON method, call it to obtain a replacement value.
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if (
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value
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&& typeof value === "object"
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&& typeof value.toJSON === "function"
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) {
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value = value.toJSON(key);
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}
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// If we were called with a replacer function, then call the replacer to
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// obtain a replacement value.
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if (typeof rep === "function") {
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value = rep.call(holder, key, value);
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}
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// What happens next depends on the value's type.
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switch (typeof value) {
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case "string":
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return quote(value);
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case "number":
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// JSON numbers must be finite. Encode non-finite numbers as null.
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return (isFinite(value))
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? String(value)
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: "null";
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case "boolean":
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case "null":
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// If the value is a boolean or null, convert it to a string. Note:
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// typeof null does not produce "null". The case is included here in
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// the remote chance that this gets fixed someday.
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return String(value);
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// If the type is "object", we might be dealing with an object or an array or
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// null.
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case "object":
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// Due to a specification blunder in ECMAScript, typeof null is "object",
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// so watch out for that case.
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if (!value) {
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return "null";
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}
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// Make an array to hold the partial results of stringifying this object value.
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gap += indent;
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partial = [];
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// Is the value an array?
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if (Object.prototype.toString.apply(value) === "[object Array]") {
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// The value is an array. Stringify every element. Use null as a placeholder
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// for non-JSON values.
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length = value.length;
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for (i = 0; i < length; i += 1) {
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partial[i] = str(i, value) || "null";
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}
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// Join all of the elements together, separated with commas, and wrap them in
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// brackets.
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v = partial.length === 0
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? "[]"
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: gap
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? (
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"[\n"
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+ gap
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+ partial.join(",\n" + gap)
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+ "\n"
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+ mind
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+ "]"
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)
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: "[" + partial.join(",") + "]";
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gap = mind;
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return v;
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}
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// If the replacer is an array, use it to select the members to be stringified.
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if (rep && typeof rep === "object") {
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length = rep.length;
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for (i = 0; i < length; i += 1) {
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if (typeof rep[i] === "string") {
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k = rep[i];
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v = str(k, value);
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if (v) {
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partial.push(quote(k) + (
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(gap)
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? ": "
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: ":"
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) + v);
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}
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}
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}
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} else {
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// Otherwise, iterate through all of the keys in the object.
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for (k in value) {
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if (Object.prototype.hasOwnProperty.call(value, k)) {
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v = str(k, value);
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if (v) {
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partial.push(quote(k) + (
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(gap)
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? ": "
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: ":"
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) + v);
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}
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}
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}
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}
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// Join all of the member texts together, separated with commas,
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// and wrap them in braces.
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v = partial.length === 0
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? "{}"
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: gap
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? "{\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "}"
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: "{" + partial.join(",") + "}";
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gap = mind;
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return v;
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}
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}
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// If the JSON object does not yet have a stringify method, give it one.
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if (typeof JSON.stringify !== "function") {
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meta = { // table of character substitutions
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"\b": "\\b",
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"\t": "\\t",
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"\n": "\\n",
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"\f": "\\f",
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"\r": "\\r",
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"\"": "\\\"",
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"\\": "\\\\"
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};
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JSON.stringify = function (value, replacer, space) {
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// The stringify method takes a value and an optional replacer, and an optional
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// space parameter, and returns a JSON text. The replacer can be a function
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// that can replace values, or an array of strings that will select the keys.
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// A default replacer method can be provided. Use of the space parameter can
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// produce text that is more easily readable.
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var i;
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gap = "";
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indent = "";
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// If the space parameter is a number, make an indent string containing that
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// many spaces.
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if (typeof space === "number") {
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for (i = 0; i < space; i += 1) {
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indent += " ";
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}
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// If the space parameter is a string, it will be used as the indent string.
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} else if (typeof space === "string") {
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indent = space;
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}
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// If there is a replacer, it must be a function or an array.
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// Otherwise, throw an error.
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rep = replacer;
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if (replacer && typeof replacer !== "function" && (
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typeof replacer !== "object"
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|| typeof replacer.length !== "number"
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)) {
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throw new Error("JSON.stringify");
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}
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// Make a fake root object containing our value under the key of "".
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// Return the result of stringifying the value.
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return str("", {"": value});
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};
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}
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// If the JSON object does not yet have a parse method, give it one.
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if (typeof JSON.parse !== "function") {
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JSON.parse = function (text, reviver) {
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// The parse method takes a text and an optional reviver function, and returns
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// a JavaScript value if the text is a valid JSON text.
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var j;
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function walk(holder, key) {
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// The walk method is used to recursively walk the resulting structure so
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// that modifications can be made.
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var k;
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var v;
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var value = holder[key];
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if (value && typeof value === "object") {
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for (k in value) {
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if (Object.prototype.hasOwnProperty.call(value, k)) {
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v = walk(value, k);
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if (v !== undefined) {
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value[k] = v;
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} else {
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delete value[k];
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}
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}
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}
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}
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return reviver.call(holder, key, value);
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}
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// Parsing happens in four stages. In the first stage, we replace certain
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// Unicode characters with escape sequences. JavaScript handles many characters
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// incorrectly, either silently deleting them, or treating them as line endings.
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text = String(text);
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rx_dangerous.lastIndex = 0;
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if (rx_dangerous.test(text)) {
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text = text.replace(rx_dangerous, function (a) {
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return (
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"\\u"
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+ ("0000" + a.charCodeAt(0).toString(16)).slice(-4)
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);
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});
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}
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// In the second stage, we run the text against regular expressions that look
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// for non-JSON patterns. We are especially concerned with "()" and "new"
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// because they can cause invocation, and "=" because it can cause mutation.
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// But just to be safe, we want to reject all unexpected forms.
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// We split the second stage into 4 regexp operations in order to work around
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// crippling inefficiencies in IE's and Safari's regexp engines. First we
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// replace the JSON backslash pairs with "@" (a non-JSON character). Second, we
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// replace all simple value tokens with "]" characters. Third, we delete all
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// open brackets that follow a colon or comma or that begin the text. Finally,
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// we look to see that the remaining characters are only whitespace or "]" or
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// "," or ":" or "{" or "}". If that is so, then the text is safe for eval.
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if (
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rx_one.test(
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text
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.replace(rx_two, "@")
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.replace(rx_three, "]")
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.replace(rx_four, "")
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)
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) {
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// In the third stage we use the eval function to compile the text into a
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// JavaScript structure. The "{" operator is subject to a syntactic ambiguity
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// in JavaScript: it can begin a block or an object literal. We wrap the text
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// in parens to eliminate the ambiguity.
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j = eval("(" + text + ")");
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// In the optional fourth stage, we recursively walk the new structure, passing
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// each name/value pair to a reviver function for possible transformation.
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return (typeof reviver === "function")
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? walk({"": j}, "")
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: j;
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}
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// If the text is not JSON parseable, then a SyntaxError is thrown.
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throw new SyntaxError("JSON.parse");
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};
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}
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}());
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