99 lines
2.3 KiB
JavaScript
99 lines
2.3 KiB
JavaScript
/*\
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title: $:/core/modules/indexers/tag-indexer.js
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type: application/javascript
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module-type: indexer
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Indexes the tiddlers with each tag
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global modules: false */
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"use strict";
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function TagIndexer(wiki) {
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this.wiki = wiki;
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}
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TagIndexer.prototype.init = function() {
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this.subIndexers = [
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new TagSubIndexer(this,"each"),
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new TagSubIndexer(this,"eachShadow"),
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new TagSubIndexer(this,"eachTiddlerPlusShadows"),
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new TagSubIndexer(this,"eachShadowPlusTiddlers")
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];
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$tw.utils.each(this.subIndexers,function(subIndexer) {
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subIndexer.addIndexMethod();
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});
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};
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TagIndexer.prototype.rebuild = function() {
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$tw.utils.each(this.subIndexers,function(subIndexer) {
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subIndexer.rebuild();
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});
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};
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TagIndexer.prototype.update = function(updateDescriptor) {
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$tw.utils.each(this.subIndexers,function(subIndexer) {
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subIndexer.update(updateDescriptor);
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});
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};
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function TagSubIndexer(indexer,iteratorMethod) {
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this.indexer = indexer;
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this.iteratorMethod = iteratorMethod;
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this.index = null; // Hashmap of tag title to {isSorted: bool, titles: [array]} or null if not yet initialised
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}
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TagSubIndexer.prototype.addIndexMethod = function() {
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var self = this;
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this.indexer.wiki[this.iteratorMethod].byTag = function(tag) {
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return self.lookup(tag).slice(0);
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};
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};
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TagSubIndexer.prototype.rebuild = function() {
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var self = this;
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// Hashmap by tag of array of {isSorted:, titles:[]}
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this.index = Object.create(null);
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// Add all the tags
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this.indexer.wiki[this.iteratorMethod](function(tiddler,title) {
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$tw.utils.each(tiddler.fields.tags,function(tag) {
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if(!self.index[tag]) {
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self.index[tag] = {isSorted: false, titles: [title]};
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} else {
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self.index[tag].titles.push(title);
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}
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});
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});
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};
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TagSubIndexer.prototype.update = function(updateDescriptor) {
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this.index = null;
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};
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TagSubIndexer.prototype.lookup = function(tag) {
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// Update the index if it has yet to be built
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if(this.index === null) {
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this.rebuild();
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}
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var indexRecord = this.index[tag];
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if(indexRecord) {
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if(!indexRecord.isSorted) {
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if(this.indexer.wiki.sortByList) {
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indexRecord.titles = this.indexer.wiki.sortByList(indexRecord.titles,tag);
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}
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indexRecord.isSorted = true;
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}
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return indexRecord.titles;
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} else {
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return [];
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}
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};
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exports.TagIndexer = TagIndexer;
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})();
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