forked from lxm_front/jsonlint-mod
361 lines
9.1 KiB
JavaScript
361 lines
9.1 KiB
JavaScript
/*
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json_parse.js
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2016-05-02
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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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/*jslint for */
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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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var ___dougJSONParse = (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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var ch; // The current character
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var 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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var text;
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var 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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var 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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var number = function () {
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// Parse a number value.
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var value;
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var 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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value = +string;
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if (!isFinite(value)) {
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error("Bad number");
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} else {
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return value;
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}
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};
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var string = function () {
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// Parse a string value.
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var hex;
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var i;
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var value = "";
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var 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 value;
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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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value += String.fromCharCode(uffff);
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} else if (typeof escapee[ch] === "string") {
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value += 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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value += 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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var 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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var 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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var value; // Place holder for the value function.
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var array = function () {
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// Parse an array value.
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var arr = [];
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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 arr; // empty array
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}
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while (ch) {
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arr.push(value());
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white();
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if (ch === "]") {
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next("]");
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return arr;
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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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var object = function () {
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// Parse an object value.
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var key;
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var obj = {};
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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 obj; // 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(obj, key)) {
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error("Duplicate key '" + key + "'");
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}
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obj[key] = value();
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white();
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if (ch === "}") {
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next("}");
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return obj;
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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")
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? number()
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: 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) {
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var result;
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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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return (typeof reviver === "function")
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? (function walk(holder, key) {
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var k;
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var v;
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var val = holder[key];
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if (val && typeof val === "object") {
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for (k in val) {
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if (Object.prototype.hasOwnProperty.call(val, k)) {
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v = walk(val, k);
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if (v !== undefined) {
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val[k] = v;
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} else {
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delete val[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, val);
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}({"": result}, ""))
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: result;
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};
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}());
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if(typeof module === 'object' && module.exports) {
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module.exports = ___dougJSONParse;
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}
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