91 lines
2.9 KiB
JavaScript
91 lines
2.9 KiB
JavaScript
/*\
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title: $:/core/modules/pluginswitcher.js
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type: application/javascript
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module-type: global
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Manages switching plugins for themes and languages.
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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/*
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options:
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wiki: wiki store to be used
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pluginType: type of plugin to be switched
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controllerTitle: title of tiddler used to control switching of this resource
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defaultPlugins: array of default plugins to be used if nominated plugin isn't found
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*/
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function PluginSwitcher(options) {
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this.wiki = options.wiki;
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this.pluginType = options.pluginType;
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this.controllerTitle = options.controllerTitle;
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this.defaultPlugins = options.defaultPlugins || [];
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// Switch to the current plugin
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this.switchPlugins();
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// Listen for changes to the selected plugin
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var self = this;
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this.wiki.addEventListener("change",function(changes) {
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if($tw.utils.hop(changes,self.controllerTitle)) {
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self.switchPlugins();
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}
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});
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}
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PluginSwitcher.prototype.switchPlugins = function() {
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// Get the name of the current theme
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var selectedPluginTitle = this.wiki.getTiddlerText(this.controllerTitle);
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// If it doesn't exist, then fallback to one of the default themes
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var index = 0;
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while(!this.wiki.getTiddler(selectedPluginTitle) && index < this.defaultPlugins.length) {
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selectedPluginTitle = this.defaultPlugins[index++];
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}
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// Accumulate the titles of the plugins that we need to load
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var plugins = [],
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self = this,
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accumulatePlugin = function(title) {
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var tiddler = self.wiki.getTiddler(title);
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if(tiddler && tiddler.isPlugin() && plugins.indexOf(title) === -1) {
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plugins.push(title);
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var pluginInfo = JSON.parse(self.wiki.getTiddlerText(title)),
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dependents = $tw.utils.parseStringArray(tiddler.fields.dependents || "");
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$tw.utils.each(dependents,function(title) {
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accumulatePlugin(title);
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});
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}
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};
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accumulatePlugin(selectedPluginTitle);
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// Unregister any existing theme tiddlers
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var unregisteredTiddlers = $tw.wiki.unregisterPluginTiddlers(this.pluginType);
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// Accumulate the titles of shadow tiddlers that have changed as a result of this switch
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var changedTiddlers = {};
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this.wiki.eachShadow(function(tiddler,title) {
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var source = self.wiki.getShadowSource(title);
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if(unregisteredTiddlers.indexOf(source) !== -1) {
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changedTiddlers[title] = true; // isDeleted?
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}
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});
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// Register any new theme tiddlers
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var registeredTiddlers = $tw.wiki.registerPluginTiddlers(this.pluginType,plugins);
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// Unpack the current theme tiddlers
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$tw.wiki.unpackPluginTiddlers();
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// Accumulate the affected shadow tiddlers
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this.wiki.eachShadow(function(tiddler,title) {
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var source = self.wiki.getShadowSource(title);
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if(registeredTiddlers.indexOf(source) !== -1) {
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changedTiddlers[title] = false; // isDeleted?
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}
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});
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// Issue change events for the modified tiddlers
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$tw.utils.each(changedTiddlers,function(status,title) {
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self.wiki.enqueueTiddlerEvent(title,status);
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});
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};
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exports.PluginSwitcher = PluginSwitcher;
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})();
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