plastic-hub-dev-node-saturn
156 lines
5.0 KiB
JavaScript
156 lines
5.0 KiB
JavaScript
/*global exports */
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/*jslint browser: true, devel: true */
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var Cereal;
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(function (window) {
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'use strict';
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var util, cereal;
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util = (function () {
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return {
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isPrimitive: function (obj) {
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return obj !== Object(obj);
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}
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};
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}());
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(function () {
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var undef = 0,
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nu = 1,
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prim = 2,
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object = 3,
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array = 4,
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ref = 5,
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jsonify, dejsonify, generateEncodeWork, generateDecodeWork;
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generateEncodeWork = function (obj, target) {
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var worklist = [], names = Object.keys(obj),
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i, name, item;
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for (i = 0; i < names.length; i += 1) {
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name = names[i];
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target[name] = [];
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worklist.push([target[name], obj[name]]);
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}
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return worklist;
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};
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jsonify = function (obj) {
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var root = [], seen = [], seenIdx = 0, worklist = [[root, obj]],
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item, target, refIdx;
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while (worklist.length > 0) {
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item = worklist.shift();
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target = item[0];
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obj = item[1];
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if (undefined === obj) {
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target[0] = undef;
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} else if (null === obj) {
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target[0] = nu;
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} else if (util.isPrimitive(obj)) {
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target[0] = prim;
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target[1] = obj;
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} else {
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refIdx = seen.lastIndexOf(obj);
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if (refIdx === -1) {
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refIdx = seenIdx;
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seenIdx += 1;
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seen[refIdx] = obj; // store orig obj, not result of obj.cerealise
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target[1] = refIdx;
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target[2] = {}; // always use an object to placate JSON itself
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if ('cerealise' in obj && typeof obj.cerealise === 'function') {
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obj = obj.cerealise();
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}
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if (Object.prototype.toString.apply(obj) === '[object Array]') {
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target[0] = array;
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} else {
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target[0] = object;
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}
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worklist = (generateEncodeWork(obj, target[2])).concat(worklist);
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} else {
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target[0] = ref;
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target[1] = refIdx;
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}
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}
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}
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return root;
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};
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generateDecodeWork = function (obj, target) {
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var worklist = [], names = Object.keys(obj),
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i, name;
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for (i = 0; i < names.length; i += 1) {
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name = names[i];
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obj[name].unshift(name);
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obj[name].unshift(target);
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worklist.push(obj[name]);
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}
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return worklist;
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};
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dejsonify = function (obj) {
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var root = {}, seen = [], worklist = [obj],
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item, target, field;
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obj.unshift('value');
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obj.unshift(root);
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while (worklist.length > 0) {
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item = worklist.shift();
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target = item[0];
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field = item[1];
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switch (item[2]) {
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case undef:
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target[field] = undefined;
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break;
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case nu:
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target[field] = null;
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break;
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case prim:
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target[field] = item[3];
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break;
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case object:
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target[field] = {};
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seen[item[3]] = target[field];
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worklist = (generateDecodeWork(item[4], target[field])).concat(worklist);
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break;
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case array:
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target[field] = [];
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seen[item[3]] = target[field];
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worklist = (generateDecodeWork(item[4], target[field])).concat(worklist);
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break;
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case ref:
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target[field] = seen[item[3]];
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if (target[field] === undefined) {
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throw "Decoding error";
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}
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break;
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default:
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throw "Decoding error";
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}
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}
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return root.value;
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};
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cereal = {
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stringify: function (obj) {
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return JSON.stringify(jsonify(obj));
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},
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parse: function (str) {
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return dejsonify(JSON.parse(str));
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}
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};
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}());
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if (typeof exports === "undefined") {
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Cereal = cereal;
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} else {
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exports.stringify = cereal.stringify;
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exports.parse = cereal.parse;
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}
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}(this));
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