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+/*
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+ json_parse.js
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+ 2015-05-02
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+
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+ Public Domain.
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+
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+ NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
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+
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+ This file creates a json_parse function.
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+
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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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+
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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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+
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+ Example:
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+/*jslint for */
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+
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+/*property
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+ at, b, call, charAt, f, fromCharCode, hasOwnProperty, message, n, name,
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+ prototype, push, r, t, text
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+*/
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+
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+(function(exports) {
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+
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+ function BigNumber(number) {
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+ this.numberStr = number.toString();
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+
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+ // not a number
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+ if (isNaN(parseFloat(this.numberStr)) === true
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+ || isFinite(this.numberStr) === false) {
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+ throw new Error(number + ' is not a number');
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+ }
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+ }
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+
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+ BigNumber.prototype.toString = function() {
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+ return this.numberStr;
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+ }
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+
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+exports.JSONParseBigNum = (function () {
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+
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+
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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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+
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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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+
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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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+
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+ error = function (m) {
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+
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+// Call error when something is wrong.
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+
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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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+
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+ next = function (c) {
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+
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+// If a c parameter is provided, verify that it matches the current character.
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+
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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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+
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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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+
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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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+
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+ number = function () {
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+
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+// Parse a number value.
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+
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+ var number,
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+ string = '';
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+
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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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+
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+ string = function () {
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+
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+// Parse a string value.
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+
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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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+
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+// When parsing for string values, we must look for " and \ characters.
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+
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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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+
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+ white = function () {
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+
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+// Skip whitespace.
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+
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+ while (ch && ch <= ' ') {
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+ next();
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+ }
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+ },
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+
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+ word = function () {
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+
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+// true, false, or null.
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+
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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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+
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+ value, // Place holder for the value function.
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+
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+ array = function () {
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+
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+// Parse an array value.
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+
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+ var array = [];
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+
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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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+
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+ object = function () {
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+
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+// Parse an object value.
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+
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+ var key,
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+ object = {};
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+
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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 (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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+
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+ value = function () {
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+
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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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+
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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'
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+ ? number()
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+ : word();
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+ }
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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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+
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+ return function (source, reviver) {
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+ var result;
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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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+
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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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+
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+ return 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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+ };
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+}());
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+})(window);
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Haohui Mai