592 lines
17 KiB
JavaScript
592 lines
17 KiB
JavaScript
/*
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json_parse.js
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2012-06-20
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Public Domain.
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NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
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This file creates a json_parse function.
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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(+a[1], +a[2] - 1, +a[3], +a[4],
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+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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This is a reference implementation. You are free to copy, modify, or
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redistribute.
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This code should be minified before deployment.
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See http://javascript.crockford.com/jsmin.html
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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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*/
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/*members "", "\"", "\/", "\\", at, b, call, charAt, f, fromCharCode,
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hasOwnProperty, message, n, name, prototype, push, r, t, text
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*/
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var BigNumber = require('./bignumber.js');
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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 ? '0' + n : n;
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}
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var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
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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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gap,
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indent,
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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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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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escapable.lastIndex = 0;
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return escapable.test(string) ? '"' + string.replace(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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}) + '"' : '"' + 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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k, // The member key.
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v, // The member value.
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length,
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mind = gap,
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partial,
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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 (value && typeof value === 'object' &&
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typeof value.toJSON === 'function') {
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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) ? String(value) : '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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// Handle big numbers.
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if (value instanceof BigNumber) {
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return value.toString();
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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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? '[\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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// 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) + (gap ? ': ' : ':') + 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) + (gap ? ': ' : ':') + 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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exports.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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throw new Error('bignumJSON.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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exports.parse = (function () {
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"use strict";
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// This is a function that can parse a JSON text, producing a JavaScript
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// data structure. It is a simple, recursive descent parser. It does not use
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// eval or regular expressions, so it can be used as a model for implementing
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// a JSON parser in other languages.
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// We are defining the function inside of another function to avoid creating
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// global variables.
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var at, // The index of the current character
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ch, // The current character
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escapee = {
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'"': '"',
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'\\': '\\',
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'/': '/',
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b: '\b',
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f: '\f',
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n: '\n',
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r: '\r',
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t: '\t'
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},
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text,
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// If true, duplicate properties are allowed and the last definition will be used
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// e.g. '{"hello": "world1", "hello": "world2"}' -> {"hello": "world2"}
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// If false, duplicate properties result in a SyntaxError.
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allowDuplicateProperties = true,
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error = function (m) {
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// Call error when something is wrong.
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throw {
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name: 'SyntaxError',
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message: m,
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at: at,
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text: text
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};
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},
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next = function (c) {
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// If a c parameter is provided, verify that it matches the current character.
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if (c && c !== ch) {
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error("Expected '" + c + "' instead of '" + ch + "'");
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}
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// Get the next character. When there are no more characters,
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// return the empty string.
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ch = text.charAt(at);
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at += 1;
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return ch;
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},
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number = function () {
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// Parse a number value.
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var number,
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string = '';
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if (ch === '-') {
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string = '-';
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next('-');
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}
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while (ch >= '0' && ch <= '9') {
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string += ch;
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next();
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}
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if (ch === '.') {
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string += '.';
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while (next() && ch >= '0' && ch <= '9') {
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string += ch;
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}
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}
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if (ch === 'e' || ch === 'E') {
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string += ch;
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next();
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if (ch === '-' || ch === '+') {
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string += ch;
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next();
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}
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while (ch >= '0' && ch <= '9') {
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string += ch;
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next();
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}
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}
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number = +string;
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if (!isFinite(number)) {
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error("Bad number");
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} else {
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// means JS rounded or truncated number, too big
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if (number.toString() !== string) {
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try {
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return new BigNumber(string);
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} catch (e) {
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// if fails, fallback to default behavior
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}
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}
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return number;
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}
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},
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string = function () {
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// Parse a string value.
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var hex,
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i,
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string = '',
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uffff;
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// When parsing for string values, we must look for " and \ characters.
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if (ch === '"') {
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while (next()) {
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if (ch === '"') {
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next();
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return string;
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}
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if (ch === '\\') {
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next();
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if (ch === 'u') {
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uffff = 0;
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for (i = 0; i < 4; i += 1) {
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hex = parseInt(next(), 16);
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if (!isFinite(hex)) {
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break;
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}
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uffff = uffff * 16 + hex;
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}
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string += String.fromCharCode(uffff);
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} else if (typeof escapee[ch] === 'string') {
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string += escapee[ch];
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} else {
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break;
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}
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} else {
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string += ch;
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}
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}
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}
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error("Bad string");
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},
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white = function () {
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// Skip whitespace.
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while (ch && ch <= ' ') {
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next();
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}
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},
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word = function () {
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// true, false, or null.
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switch (ch) {
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case 't':
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next('t');
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next('r');
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next('u');
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next('e');
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return true;
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case 'f':
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next('f');
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next('a');
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next('l');
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next('s');
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next('e');
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return false;
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case 'n':
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next('n');
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next('u');
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next('l');
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next('l');
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return null;
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}
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error("Unexpected '" + ch + "'");
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},
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value, // Place holder for the value function.
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array = function () {
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// Parse an array value.
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var array = [];
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if (ch === '[') {
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next('[');
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white();
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if (ch === ']') {
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next(']');
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return array; // empty array
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}
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while (ch) {
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array.push(value());
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white();
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if (ch === ']') {
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next(']');
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return array;
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}
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next(',');
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white();
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}
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}
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error("Bad array");
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},
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object = function () {
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// Parse an object value.
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var key,
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object = {};
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if (ch === '{') {
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next('{');
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white();
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if (ch === '}') {
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next('}');
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return object; // empty object
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}
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while (ch) {
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key = string();
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white();
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next(':');
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if (!allowDuplicateProperties &&
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Object.hasOwnProperty.call(object, key)) {
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error('Duplicate key "' + key + '"');
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}
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object[key] = value();
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white();
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if (ch === '}') {
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next('}');
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return object;
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}
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next(',');
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white();
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}
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}
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error("Bad object");
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};
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value = function () {
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// Parse a JSON value. It could be an object, an array, a string, a number,
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// or a word.
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white();
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switch (ch) {
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case '{':
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return object();
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case '[':
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return array();
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case '"':
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return string();
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case '-':
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return number();
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default:
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return ch >= '0' && ch <= '9' ? number() : word();
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}
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};
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// Return the json_parse function. It will have access to all of the above
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// functions and variables.
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return function (source, reviver, _allowDuplicateProperties) {
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var result;
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if (_allowDuplicateProperties !== undefined) {
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allowDuplicateProperties = _allowDuplicateProperties;
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}
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text = source;
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at = 0;
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ch = ' ';
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result = value();
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white();
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if (ch) {
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error("Syntax error");
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}
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// If there is a reviver function, we recursively walk the new structure,
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// passing each name/value pair to the reviver function for possible
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// transformation, starting with a temporary root object that holds the result
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// in an empty key. If there is not a reviver function, we simply return the
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// result.
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var ret = typeof reviver === 'function'
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? (function walk(holder, key) {
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var k, v, 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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}({'': result}, ''))
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: result;
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// Set text to null so we don't retain a reference to the original text
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// after this function returns.
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text = null;
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return ret;
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};
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}());
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