87 lines
1.8 KiB
JavaScript
87 lines
1.8 KiB
JavaScript
/*\
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title: $:/core/modules/indexers/backlinks-indexer.js
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type: application/javascript
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module-type: indexer
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Indexes the tiddlers' backlinks
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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 BacklinksIndexer(wiki) {
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this.wiki = wiki;
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}
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BacklinksIndexer.prototype.init = function() {
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this.index = null;
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}
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BacklinksIndexer.prototype.rebuild = function() {
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this.index = null;
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}
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BacklinksIndexer.prototype._getLinks = function(tiddler) {
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var parser = this.wiki.parseText(tiddler.fields.type, tiddler.fields.text, {});
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if(parser) {
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return this.wiki.extractLinks(parser.tree);
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}
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return [];
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}
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BacklinksIndexer.prototype.update = function(updateDescriptor) {
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if(!this.index) {
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return;
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}
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var newLinks = [],
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oldLinks = [],
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self = this;
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if(updateDescriptor.old.exists) {
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oldLinks = this._getLinks(updateDescriptor.old.tiddler);
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}
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if(updateDescriptor.new.exists) {
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newLinks = this._getLinks(updateDescriptor.new.tiddler);
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}
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$tw.utils.each(oldLinks,function(link) {
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if(self.index[link]) {
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delete self.index[link][updateDescriptor.old.tiddler.fields.title];
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}
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});
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$tw.utils.each(newLinks,function(link) {
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if(!self.index[link]) {
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self.index[link] = Object.create(null);
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}
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self.index[link][updateDescriptor.new.tiddler.fields.title] = true;
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});
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}
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BacklinksIndexer.prototype.lookup = function(title) {
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if(!this.index) {
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this.index = Object.create(null);
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var self = this;
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this.wiki.forEachTiddler(function(title,tiddler) {
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var links = self._getLinks(tiddler);
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$tw.utils.each(links, function(link) {
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if(!self.index[link]) {
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self.index[link] = Object.create(null);
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}
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self.index[link][title] = true;
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});
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});
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}
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if(this.index[title]) {
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return Object.keys(this.index[title]);
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} else {
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return [];
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}
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}
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exports.BacklinksIndexer = BacklinksIndexer;
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})();
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