From: Joey Schulze Date: Wed, 20 Jan 2010 09:47:03 +0000 (+0100) Subject: Import JSON functions from http://www.json.org/json_parse.js X-Git-Tag: 2010-06-02_customer~273 X-Git-Url: https://git.infodrom.org/?p=misc%2Fkostenrechnung;a=commitdiff_plain;h=370b5a5838e2edd066a8900753fc0307a533129e Import JSON functions from json.org/json_parse.js --- diff --git a/lib/json_parse.js b/lib/json_parse.js new file mode 100644 index 0000000..48c1da9 --- /dev/null +++ b/lib/json_parse.js @@ -0,0 +1,347 @@ +/* + http://www.JSON.org/json_parse.js + 2009-04-18 + + Public Domain. + + NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK. + + This file creates a json_parse function. + + json_parse(text, reviver) + This method parses a JSON text to produce an object or array. + It can throw a SyntaxError exception. + + The optional reviver parameter is a function that can filter and + transform the results. It receives each of the keys and values, + and its return value is used instead of the original value. + If it returns what it received, then the structure is not modified. + If it returns undefined then the member is deleted. + + Example: + + // Parse the text. Values that look like ISO date strings will + // be converted to Date objects. + + myData = json_parse(text, function (key, value) { + var a; + if (typeof value === 'string') { + a = +/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); + if (a) { + return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], + +a[5], +a[6])); + } + } + return value; + }); + + This is a reference implementation. You are free to copy, modify, or + redistribute. + + This code should be minified before deployment. + See http://javascript.crockford.com/jsmin.html + + USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO + NOT CONTROL. +*/ + +/*members "", "\"", "\/", "\\", at, b, call, charAt, f, fromCharCode, + hasOwnProperty, message, n, name, push, r, t, text +*/ + +/*global json_parse */ + +json_parse = (function () { + +// This is a function that can parse a JSON text, producing a JavaScript +// data structure. It is a simple, recursive descent parser. It does not use +// eval or regular expressions, so it can be used as a model for implementing +// a JSON parser in other languages. + +// We are defining the function inside of another function to avoid creating +// global variables. + + var at, // The index of the current character + ch, // The current character + escapee = { + '"': '"', + '\\': '\\', + '/': '/', + b: '\b', + f: '\f', + n: '\n', + r: '\r', + t: '\t' + }, + text, + + error = function (m) { + +// Call error when something is wrong. + + throw { + name: 'SyntaxError', + message: m, + at: at, + text: text + }; + }, + + next = function (c) { + +// If a c parameter is provided, verify that it matches the current character. + + if (c && c !== ch) { + error("Expected '" + c + "' instead of '" + ch + "'"); + } + +// Get the next character. When there are no more characters, +// return the empty string. + + ch = text.charAt(at); + at += 1; + return ch; + }, + + number = function () { + +// Parse a number value. + + var number, + string = ''; + + if (ch === '-') { + string = '-'; + next('-'); + } + while (ch >= '0' && ch <= '9') { + string += ch; + next(); + } + if (ch === '.') { + string += '.'; + while (next() && ch >= '0' && ch <= '9') { + string += ch; + } + } + if (ch === 'e' || ch === 'E') { + string += ch; + next(); + if (ch === '-' || ch === '+') { + string += ch; + next(); + } + while (ch >= '0' && ch <= '9') { + string += ch; + next(); + } + } + number = +string; + if (isNaN(number)) { + error("Bad number"); + } else { + return number; + } + }, + + string = function () { + +// Parse a string value. + + var hex, + i, + string = '', + uffff; + +// When parsing for string values, we must look for " and \ characters. + + if (ch === '"') { + while (next()) { + if (ch === '"') { + next(); + return string; + } else if (ch === '\\') { + next(); + if (ch === 'u') { + uffff = 0; + for (i = 0; i < 4; i += 1) { + hex = parseInt(next(), 16); + if (!isFinite(hex)) { + break; + } + uffff = uffff * 16 + hex; + } + string += String.fromCharCode(uffff); + } else if (typeof escapee[ch] === 'string') { + string += escapee[ch]; + } else { + break; + } + } else { + string += ch; + } + } + } + error("Bad string"); + }, + + white = function () { + +// Skip whitespace. + + while (ch && ch <= ' ') { + next(); + } + }, + + word = function () { + +// true, false, or null. + + switch (ch) { + case 't': + next('t'); + next('r'); + next('u'); + next('e'); + return true; + case 'f': + next('f'); + next('a'); + next('l'); + next('s'); + next('e'); + return false; + case 'n': + next('n'); + next('u'); + next('l'); + next('l'); + return null; + } + error("Unexpected '" + ch + "'"); + }, + + value, // Place holder for the value function. + + array = function () { + +// Parse an array value. + + var array = []; + + if (ch === '[') { + next('['); + white(); + if (ch === ']') { + next(']'); + return array; // empty array + } + while (ch) { + array.push(value()); + white(); + if (ch === ']') { + next(']'); + return array; + } + next(','); + white(); + } + } + error("Bad array"); + }, + + object = function () { + +// Parse an object value. + + var key, + object = {}; + + if (ch === '{') { + next('{'); + white(); + if (ch === '}') { + next('}'); + return object; // empty object + } + while (ch) { + key = string(); + white(); + next(':'); + if (Object.hasOwnProperty.call(object, key)) { + error('Duplicate key "' + key + '"'); + } + object[key] = value(); + white(); + if (ch === '}') { + next('}'); + return object; + } + next(','); + white(); + } + } + error("Bad object"); + }; + + value = function () { + +// Parse a JSON value. It could be an object, an array, a string, a number, +// or a word. + + white(); + switch (ch) { + case '{': + return object(); + case '[': + return array(); + case '"': + return string(); + case '-': + return number(); + default: + return ch >= '0' && ch <= '9' ? number() : word(); + } + }; + +// Return the json_parse function. It will have access to all of the above +// functions and variables. + + return function (source, reviver) { + var result; + + text = source; + at = 0; + ch = ' '; + result = value(); + white(); + if (ch) { + error("Syntax error"); + } + +// If there is a reviver function, we recursively walk the new structure, +// passing each name/value pair to the reviver function for possible +// transformation, starting with a temporary root object that holds the result +// in an empty key. If there is not a reviver function, we simply return the +// result. + + return typeof reviver === 'function' ? (function walk(holder, key) { + var k, v, value = holder[key]; + if (value && typeof value === 'object') { + for (k in value) { + if (Object.hasOwnProperty.call(value, k)) { + v = walk(value, k); + if (v !== undefined) { + value[k] = v; + } else { + delete value[k]; + } + } + } + } + return reviver.call(holder, key, value); + }({'': result}, '')) : result; + }; +}()); \ No newline at end of file