use unified listmap
ansuz
7 years ago
parent
661db129b2
commit
56102d3689
@ -1,744 +0,0 @@
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require.config({ paths: { 'json.sortify': '/bower_components/json.sortify/dist/JSON.sortify' } });
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define([
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'/bower_components/chainpad-netflux/chainpad-netflux.js',
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'json.sortify',
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'/bower_components/chainpad/chainpad.dist.js'
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], function (Realtime, Sortify, ChainPad) {
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var api = {};
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// "Proxy" is undefined in Safari : we need to use an normal object and check if there are local
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// changes regurlarly.
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var isFakeProxy = typeof window.Proxy === "undefined";
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var DeepProxy = api.DeepProxy = (function () {
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var deepProxy = {};
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var isArray = deepProxy.isArray = Array.isArray || function (obj) {
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return Object.toString(obj) === '[object Array]';
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};
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/* Arrays and nulls both register as 'object' when using native typeof
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we need to distinguish them as their own types, so use this instead. */
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var type = deepProxy.type = function (dat) {
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return dat === null? 'null': isArray(dat)?'array': typeof(dat);
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};
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/* Check if an (sub-)element in an object or an array and should be a proxy.
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If the browser doesn't support Proxy, return false */
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var isProxyable = deepProxy.isProxyable = function (obj, forceCheck) {
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if (typeof forceCheck === "undefined" && isFakeProxy) { return false; }
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return ['object', 'array'].indexOf(type(obj)) !== -1;
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};
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/* Any time you set a value, check its type.
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If that type is proxyable, make a new proxy. */
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var setter = deepProxy.set = function (cb) {
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return function (obj, prop, value) {
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if (prop === 'on') {
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throw new Error("'on' is a reserved attribute name for realtime lists and maps");
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}
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if (isProxyable(value)) {
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obj[prop] = deepProxy.create(value, cb);
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} else {
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obj[prop] = value;
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}
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cb();
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return obj[prop] || true; // always return truthey or you have problems
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};
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};
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var pathMatches = deepProxy.pathMatches = function (path, pattern) {
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return !pattern.some(function (x, i) {
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return x !== path[i];
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});
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};
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var lengthDescending = function (a, b) { return b.pattern.length - a.pattern.length; };
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/* TODO implement 'off' as well.
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change 'setter' to warn users when they attempt to set 'off'
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*/
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var on = function(events) {
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return function (evt, pattern, f) {
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switch (evt) {
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case 'change':
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// pattern needs to be an array
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pattern = type(pattern) === 'array'? pattern: [pattern];
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events.change.push({
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cb: function (oldval, newval, path, root) {
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if (pathMatches(path, pattern)) {
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return f(oldval, newval, path, root);
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}
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},
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pattern: pattern,
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});
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// sort into descending order so we evaluate in order of specificity
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events.change.sort(lengthDescending);
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break;
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case 'remove':
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pattern = type(pattern) === 'array'? pattern: [pattern];
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events.remove.push({
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cb: function (oldval, path, root) {
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if (pathMatches(path, pattern)) { return f(oldval, path, root); }
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},
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pattern: pattern,
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});
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events.remove.sort(lengthDescending);
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break;
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case 'ready':
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events.ready.push({
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// on('ready' has a different signature than
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// change and delete, so use 'pattern', not 'f'
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cb: function (info) {
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pattern(info);
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}
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});
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break;
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case 'disconnect':
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events.disconnect.push({
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cb: function (info) {
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// as above
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pattern(info);
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}
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});
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break;
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case 'reconnect':
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events.reconnect.push({
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cb: function (info) {
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// as above
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pattern(info);
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}
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});
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break;
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case 'create':
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events.create.push({
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cb: function (info) {
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pattern(info);
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}
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});
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break;
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default:
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break;
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}
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return this;
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};
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};
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var getter = deepProxy.get = function (/* cb */) {
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var events = {
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disconnect: [],
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reconnect: [],
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change: [],
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ready: [],
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remove: [],
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create: [],
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};
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return function (obj, prop) {
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if (prop === 'on') {
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return on(events);
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} else if (prop === '_isProxy') {
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return true;
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} else if (prop === '_events') {
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return events;
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}
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return obj[prop];
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};
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};
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var deleter = deepProxy.delete = function (cb) {
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return function (obj, prop) {
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if (typeof(obj[prop]) === 'undefined') { return true; }
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delete obj[prop];
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cb();
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return true;
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};
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};
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var handlers = deepProxy.handlers = function (cb, isRoot) {
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if (!isRoot) {
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return {
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set: setter(cb),
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get: function (obj, prop) {
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if (prop === '_isProxy') {
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return true;
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}
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return obj[prop];
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},
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deleteProperty: deleter(cb),
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};
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}
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return {
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set: setter(cb),
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get: getter(cb),
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deleteProperty: deleter(cb),
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};
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};
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var remoteChangeFlag = deepProxy.remoteChangeFlag = false;
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var stringifyFakeProxy = deepProxy.stringifyFakeProxy = function (proxy) {
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var copy = JSON.parse(Sortify(proxy));
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delete copy._events;
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delete copy._isProxy;
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return Sortify(copy);
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};
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deepProxy.checkLocalChange = function (obj, cb) {
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if (!isFakeProxy) { return; }
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var oldObj = stringifyFakeProxy(obj);
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window.setInterval(function() {
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var newObj = stringifyFakeProxy(obj);
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if (newObj !== oldObj) {
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oldObj = newObj;
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if (remoteChangeFlag) {
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remoteChangeFlag = false;
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} else {
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cb();
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}
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}
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},300);
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};
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var create = deepProxy.create = function (obj, opt, isRoot) {
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/* recursively create proxies in case users do:
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`x.a = {b: {c: 5}};
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otherwise the inner object is not a proxy, which leads to incorrect
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behaviour on the client that initiated the object (but not for
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clients that receive the objects) */
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// if the user supplied a callback, use it to create handlers
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// this saves a bit of work in recursion
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var methods = type(opt) === 'function'? handlers(opt, isRoot) : opt;
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switch (type(obj)) {
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case 'object':
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var keys = Object.keys(obj);
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keys.forEach(function (k) {
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if (isProxyable(obj[k]) && !obj[k]._isProxy) {
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obj[k] = create(obj[k], opt);
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}
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});
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break;
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case 'array':
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obj.forEach(function (o, i) {
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if (isProxyable(o) && !o._isProxy) {
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obj[i] = create(obj[i], opt);
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}
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});
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break;
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default:
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// if it's not an array or object, you don't need to proxy it
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throw new Error('attempted to make a proxy of an unproxyable object');
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}
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if (!isFakeProxy) {
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if (obj._isProxy) {
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return obj;
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}
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return new window.Proxy(obj, methods);
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}
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var proxy = JSON.parse(JSON.stringify(obj));
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if (isRoot) {
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var events = {
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disconnect: [],
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reconnect: [],
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change: [],
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ready: [],
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remove: [],
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create: [],
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};
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proxy.on = on(events);
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proxy._events = events;
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}
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return proxy;
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};
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// onChange(path, key, root, oldval, newval)
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var onChange = function (path, key, root, oldval, newval) {
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var P = path.slice(0);
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P.push(key);
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/* returning false in your callback terminates 'bubbling up'
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we can accomplish this with Array.some because we've presorted
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listeners by the specificity of their path
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*/
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root._events.change.some(function (handler) {
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return handler.cb(oldval, newval, P, root) === false;
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});
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};
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var find = deepProxy.find = function (map, path) {
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/* safely search for nested values in an object via a path */
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return (map && path.reduce(function (p, n) {
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return typeof p[n] !== 'undefined' && p[n];
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}, map)) || undefined;
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};
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var onRemove = function (path, key, root, old, top) {
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var newpath = path.concat(key);
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var X = find(root, newpath);
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var t_X = type(X);
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/* TODO 'find' is correct but unnecessarily expensive.
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optimize it. */
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switch (t_X) {
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case 'array':
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if (top) {
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// the top of an onremove should emit an onchange instead
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onChange(path, key, root, old, undefined);// no newval since it's a deletion
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} else {
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root._events.remove.forEach(function (handler) {
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return handler.cb(X, newpath, root);
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});
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}
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// remove all of the array's children
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X.forEach(function (x, i) {
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onRemove(newpath, i, root);
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});
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break;
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case 'object':
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if (top) {
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onChange(path, key, root, old, undefined);// no newval since it's a deletion
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} else {
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root._events.remove.forEach(function (handler) {
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return handler.cb(X, newpath, root, old, false);
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});
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}
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// remove all of the object's children
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Object.keys(X).forEach(function (key) {
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onRemove(newpath, key, root, X[key], false);
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});
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break;
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default:
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root._events.remove.forEach(function (handler) {
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return handler.cb(X, newpath, root);
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});
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break;
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}
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};
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/* compare a new object 'B' against an existing proxy object 'A'
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provide a unary function 'f' for the purpose of constructing new
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deep proxies from regular objects and arrays.
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Supply the path as you recurse, for the purpose of emitting events
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attached to particular paths within the complete structure.
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Operates entirely via side effects on 'A'
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*/
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var objects = deepProxy.objects = function (A, B, f, path, root) {
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var Akeys = Object.keys(A);
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var Bkeys = Object.keys(B);
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/* iterating over the keys in B will tell you if a new key exists
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it will not tell you if a key has been removed.
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to accomplish that you will need to iterate over A's keys
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*/
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/* TODO return a truthy or falsey value (in 'objects' and 'arrays')
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so that we have some measure of whether an object or array changed
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(from the higher level in the tree, rather than doing everything
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at the leaf level).
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bonus points if you can defer events until the complete diff has
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finished (collect them into an array or something, and simplify
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the event if possible)
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*/
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Bkeys.forEach(function (b) {
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var t_b = type(B[b]);
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var old = A[b];
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if (Akeys.indexOf(b) === -1) {
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// there was an insertion
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// mind the fallthrough behaviour
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switch (t_b) {
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case 'undefined':
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// umm. this should never happen?
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throw new Error("undefined type has key. this shouldn't happen?");
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case 'array':
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case 'object':
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A[b] = f(B[b]);
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break;
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default:
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A[b] = B[b];
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}
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// insertions are a change
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// onChange(path, key, root, oldval, newval)
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onChange(path, b, root, old, B[b]);
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return;
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}
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// else the key already existed
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var t_a = type(A[b]);
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if (t_a !== t_b) {
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// its type changed!
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console.log("type changed from [%s] to [%s]", t_a, t_b);
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switch (t_b) {
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case 'undefined':
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throw new Error("first pass should never reveal undefined keys");
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case 'array':
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A[b] = f(B[b]);
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// make a new proxy
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break;
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case 'object':
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A[b] = f(B[b]);
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// make a new proxy
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break;
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default:
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// all other datatypes just require assignment.
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A[b] = B[b];
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break;
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}
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// type changes always mean a change happened
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onChange(path, b, root, old, B[b]);
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return;
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}
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// values might have changed, if not types
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if (['array', 'object'].indexOf(t_a) === -1) {
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// it's not an array or object, so we can do deep equality
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if (A[b] !== B[b]) {
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// not equal, so assign
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A[b] = B[b];
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onChange(path, b, root, old, B[b]);
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}
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return;
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}
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// else it's an array or object
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var nextPath = path.slice(0).concat(b);
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if (t_a === 'object') {
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// it's an object
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objects.call(root, A[b], B[b], f, nextPath, root);
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} else {
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// it's an array
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deepProxy.arrays.call(root, A[b], B[b], f, nextPath, root);
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}
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});
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Akeys.forEach(function (a) {
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var old = A[a];
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if (a === "on" || a === "_events") { return; }
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// the key was deleted
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if (Bkeys.indexOf(a) === -1 || type(B[a]) === 'undefined') {
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onRemove(path, a, root, old, true);
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delete A[a];
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}
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});
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return;
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};
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||||
var arrays = deepProxy.arrays = function (A, B, f, path, root) {
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var l_A = A.length;
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var l_B = B.length;
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if (l_A !== l_B) {
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// B is longer than Aj
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// there has been an insertion
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// OR
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// A is longer than B
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// there has been a deletion
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B.forEach(function (b, i) {
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var t_a = type(A[i]);
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var t_b = type(b);
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var old = A[i];
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||||
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||||
if (t_a !== t_b) {
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// type changes are always destructive
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// that's good news because destructive is easy
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switch (t_b) {
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case 'undefined':
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throw new Error('this should never happen');
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case 'object':
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A[i] = f(b);
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break;
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case 'array':
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A[i] = f(b);
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break;
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default:
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A[i] = b;
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break;
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||||
}
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// path, key, root object, oldvalue, newvalue
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onChange(path, i, root, old, b);
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} else {
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// same type
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var nextPath = path.slice(0).concat(i);
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switch (t_b) {
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case 'object':
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objects.call(root, A[i], b, f, nextPath, root);
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break;
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case 'array':
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if (arrays.call(root, A[i], b, f, nextPath, root)) {
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onChange(path, i, root, old, b);
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}
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break;
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||||
default:
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if (b !== A[i]) {
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A[i] = b;
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onChange(path, i, root, old, b);
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}
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||||
break;
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||||
}
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||||
}
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||||
});
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||||
if (l_A > l_B) {
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// A was longer than B, so there have been deletions
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var i = l_B;
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//var t_a;
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var old;
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||||
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for (; i <= l_B; i++) {
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// recursively delete
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old = A[i];
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onRemove(path, i, root, old, true);
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}
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// cool
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||||
}
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A.length = l_B;
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return;
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||||
}
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||||
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||||
// else they are the same length, iterate over their values
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||||
A.forEach(function (a, i) {
|
||||
var t_a = type(a);
|
||||
var t_b = type(B[i]);
|
||||
|
||||
var old = a;
|
||||
|
||||
// they have different types
|
||||
if (t_a !== t_b) {
|
||||
switch (t_b) {
|
||||
case 'undefined':
|
||||
onRemove(path, i, root, old, true);
|
||||
break;
|
||||
|
||||
// watch out for fallthrough behaviour
|
||||
// if it's an object or array, create a proxy
|
||||
case 'object':
|
||||
case 'array':
|
||||
A[i] = f(B[i]);
|
||||
break;
|
||||
default:
|
||||
A[i] = B[i];
|
||||
break;
|
||||
}
|
||||
|
||||
onChange(path, i, root, old, B[i]);
|
||||
return;
|
||||
}
|
||||
|
||||
// they are the same type, clone the paths array and push to it
|
||||
var nextPath = path.slice(0).concat(i);
|
||||
|
||||
// same type
|
||||
switch (t_b) {
|
||||
case 'undefined':
|
||||
throw new Error('existing key had type `undefined`. this should never happen');
|
||||
case 'object':
|
||||
if (objects.call(root, A[i], B[i], f, nextPath, root)) {
|
||||
onChange(path, i, root, old, B[i]);
|
||||
}
|
||||
break;
|
||||
case 'array':
|
||||
if (arrays.call(root, A[i], B[i], f, nextPath, root)) {
|
||||
onChange(path, i, root, old, B[i]);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
if (A[i] !== B[i]) {
|
||||
A[i] = B[i];
|
||||
onChange(path, i, root, old, B[i]);
|
||||
}
|
||||
break;
|
||||
}
|
||||
});
|
||||
return;
|
||||
};
|
||||
|
||||
deepProxy.update = function (A, B, cb) {
|
||||
var t_A = type(A);
|
||||
var t_B = type(B);
|
||||
|
||||
if (t_A !== t_B) {
|
||||
throw new Error("Proxy updates can't result in type changes");
|
||||
}
|
||||
|
||||
switch (t_B) {
|
||||
/* use .call so you can supply a different `this` value */
|
||||
case 'array':
|
||||
arrays.call(A, A, B, function (obj) {
|
||||
return create(obj, cb);
|
||||
}, [], A);
|
||||
break;
|
||||
case 'object':
|
||||
// arrays.call(this, A , B , f, path , root)
|
||||
objects.call(A, A, B, function (obj) {
|
||||
return create(obj, cb);
|
||||
}, [], A);
|
||||
break;
|
||||
default:
|
||||
throw new Error("unsupported realtime datatype:" + t_B);
|
||||
}
|
||||
};
|
||||
|
||||
return deepProxy;
|
||||
}());
|
||||
|
||||
api.create = function (cfg) {
|
||||
/* validate your inputs before proceeding */
|
||||
|
||||
if (!DeepProxy.isProxyable(cfg.data, true)) {
|
||||
throw new Error('unsupported datatype: '+ DeepProxy.type(cfg.data));
|
||||
}
|
||||
|
||||
var realtimeOptions = {
|
||||
userName: cfg.userName,
|
||||
initialState: Sortify(cfg.data),
|
||||
readOnly: cfg.readOnly,
|
||||
patchTransformer: ChainPad.SmartJSONTransformer,
|
||||
logLevel: typeof(cfg.logLevel) === 'undefined'? 0: cfg.logLevel,
|
||||
validateContent: function (content) {
|
||||
try {
|
||||
JSON.parse(content);
|
||||
return true;
|
||||
} catch (e) {
|
||||
console.error("Failed to parse, rejecting patch");
|
||||
return false;
|
||||
}
|
||||
},
|
||||
};
|
||||
|
||||
var initializing = true;
|
||||
|
||||
var setterCb = function () {
|
||||
if (!DeepProxy.remoteChangeFlag) { realtimeOptions.onLocal(); }
|
||||
};
|
||||
|
||||
var rt = {};
|
||||
var realtime;
|
||||
|
||||
var proxy;
|
||||
|
||||
realtimeOptions.onRemote = function () {
|
||||
if (initializing) { return; }
|
||||
// TODO maybe implement history support here
|
||||
|
||||
var userDoc = realtime.getUserDoc();
|
||||
var parsed = JSON.parse(userDoc);
|
||||
|
||||
DeepProxy.remoteChangeFlag = true;
|
||||
DeepProxy.update(proxy, parsed, setterCb);
|
||||
DeepProxy.remoteChangeFlag = false;
|
||||
};
|
||||
|
||||
var onLocal = realtimeOptions.onLocal = function () {
|
||||
if (initializing) { return; }
|
||||
var strung = isFakeProxy? DeepProxy.stringifyFakeProxy(proxy): Sortify(proxy);
|
||||
realtime.contentUpdate(strung);
|
||||
|
||||
// try harder
|
||||
if (realtime.getUserDoc() !== strung) { realtime.contentUpdate(strung); }
|
||||
|
||||
// onLocal
|
||||
if (cfg.onLocal) { cfg.onLocal(); }
|
||||
};
|
||||
|
||||
proxy = DeepProxy.create(cfg.data, setterCb, true);
|
||||
console.log(proxy);
|
||||
|
||||
realtimeOptions.onInit = function (info) {
|
||||
proxy._events.create.forEach(function (handler) {
|
||||
handler.cb(info);
|
||||
});
|
||||
};
|
||||
|
||||
var ready = false;
|
||||
realtimeOptions.onReady = function (info) {
|
||||
if (ready) { return; }
|
||||
if (realtime !== info.realtime) {
|
||||
realtime = rt.realtime = info.realtime;
|
||||
} else {
|
||||
console.error(realtime);
|
||||
}
|
||||
|
||||
var userDoc = realtime.getUserDoc();
|
||||
var parsed = JSON.parse(userDoc);
|
||||
|
||||
DeepProxy.update(proxy, parsed, setterCb);
|
||||
|
||||
proxy._events.ready.forEach(function (handler) {
|
||||
handler.cb(info);
|
||||
});
|
||||
|
||||
DeepProxy.checkLocalChange(proxy, onLocal);
|
||||
|
||||
initializing = false;
|
||||
ready = true;
|
||||
};
|
||||
|
||||
realtimeOptions.onAbort = function (info) {
|
||||
proxy._events.disconnect.forEach(function (handler) {
|
||||
handler.cb(info);
|
||||
});
|
||||
};
|
||||
|
||||
realtimeOptions.onConnectionChange = function (info) {
|
||||
if (info.state) { // reconnect
|
||||
initializing = true;
|
||||
proxy._events.reconnect.forEach(function (handler) {
|
||||
handler.cb(info);
|
||||
});
|
||||
return;
|
||||
}
|
||||
// disconnected
|
||||
proxy._events.disconnect.forEach(function (handler) {
|
||||
handler.cb(info);
|
||||
});
|
||||
};
|
||||
|
||||
realtimeOptions.onError = function (info) {
|
||||
proxy._events.disconnect.forEach(function (handler) {
|
||||
handler.cb(info);
|
||||
});
|
||||
};
|
||||
|
||||
realtime = rt.cpCnInner = cfg.common.startRealtime(realtimeOptions);
|
||||
rt.proxy = proxy;
|
||||
rt.realtime = realtime;
|
||||
|
||||
return rt;
|
||||
};
|
||||
|
||||
return api;
|
||||
});
|
||||
Loading…
Reference in New Issue