mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-10-30 22:56:17 +00:00
8d39ce95eb
* feat: use `isShadowTiddler` insteadof `allTitles` * fix: use `tiddlerExists` instead
144 lines
4.3 KiB
JavaScript
144 lines
4.3 KiB
JavaScript
/*\
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title: $:/core/modules/indexers/field-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 field value
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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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var DEFAULT_MAXIMUM_INDEXED_VALUE_LENGTH = 128;
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function FieldIndexer(wiki) {
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this.wiki = wiki;
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}
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FieldIndexer.prototype.init = function() {
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this.index = null;
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this.maxIndexedValueLength = DEFAULT_MAXIMUM_INDEXED_VALUE_LENGTH;
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this.addIndexMethods();
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}
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// Provided for testing
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FieldIndexer.prototype.setMaxIndexedValueLength = function(length) {
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this.index = null;
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this.maxIndexedValueLength = length;
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};
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FieldIndexer.prototype.addIndexMethods = function() {
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var self = this;
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// get all tiddlers, including those overwrite shadow tiddlers
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this.wiki.each.byField = function(name,value) {
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var lookup = self.lookup(name,value);
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return lookup && lookup.filter(function(title) {
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return self.wiki.tiddlerExists(title)
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});
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};
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// get shadow tiddlers, including shadow tiddlers that is overwritten
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this.wiki.eachShadow.byField = function(name,value) {
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var lookup = self.lookup(name,value);
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return lookup && lookup.filter(function(title) {
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return self.wiki.isShadowTiddler(title)
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});
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};
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this.wiki.eachTiddlerPlusShadows.byField = function(name,value) {
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var lookup = self.lookup(name,value);
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return lookup ? lookup.slice(0) : null;
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};
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this.wiki.eachShadowPlusTiddlers.byField = function(name,value) {
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var lookup = self.lookup(name,value);
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return lookup ? lookup.slice(0) : null;
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};
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};
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/*
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Tear down and then rebuild the index as if all tiddlers have changed
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*/
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FieldIndexer.prototype.rebuild = function() {
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// Invalidate the index so that it will be rebuilt when it is next used
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this.index = null;
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};
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/*
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Build the index for a particular field
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*/
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FieldIndexer.prototype.buildIndexForField = function(name) {
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var self = this;
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// Hashmap by field name of hashmap by field value of array of tiddler titles
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this.index = this.index || Object.create(null);
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this.index[name] = Object.create(null);
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var baseIndex = this.index[name];
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// Update the index for each tiddler
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this.wiki.eachTiddlerPlusShadows(function(tiddler,title) {
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if(name in tiddler.fields) {
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var value = tiddler.getFieldString(name);
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// Skip any values above the maximum length
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if(value.length < self.maxIndexedValueLength) {
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baseIndex[value] = baseIndex[value] || [];
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baseIndex[value].push(title);
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}
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}
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});
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};
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/*
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Update the index in the light of a tiddler value changing; note that the title must be identical. (Renames are handled as a separate delete and create)
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updateDescriptor: {old: {tiddler: <tiddler>, shadow: <boolean>, exists: <boolean>},new: {tiddler: <tiddler>, shadow: <boolean>, exists: <boolean>}}
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*/
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FieldIndexer.prototype.update = function(updateDescriptor) {
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var self = this;
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// Don't do anything if the index hasn't been built yet
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if(this.index === null) {
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return;
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}
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// Remove the old tiddler from the index
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if(updateDescriptor.old.tiddler) {
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$tw.utils.each(this.index,function(indexEntry,name) {
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if(name in updateDescriptor.old.tiddler.fields) {
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var value = updateDescriptor.old.tiddler.getFieldString(name),
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tiddlerList = indexEntry[value];
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if(tiddlerList) {
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var index = tiddlerList.indexOf(updateDescriptor.old.tiddler.fields.title);
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if(index !== -1) {
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tiddlerList.splice(index,1);
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}
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}
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}
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});
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}
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// Add the new tiddler to the index
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if(updateDescriptor["new"].tiddler) {
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$tw.utils.each(this.index,function(indexEntry,name) {
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if(name in updateDescriptor["new"].tiddler.fields) {
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var value = updateDescriptor["new"].tiddler.getFieldString(name);
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if(value.length < self.maxIndexedValueLength) {
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indexEntry[value] = indexEntry[value] || [];
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indexEntry[value].push(updateDescriptor["new"].tiddler.fields.title);
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}
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}
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});
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}
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};
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// Lookup the given field returning a list of tiddler titles
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FieldIndexer.prototype.lookup = function(name,value) {
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// Fail the lookup if the value is too long
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if(value.length >= this.maxIndexedValueLength) {
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return null;
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}
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// Update the index if it has yet to be built
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if(this.index === null || !this.index[name]) {
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this.buildIndexForField(name);
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}
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return this.index[name][value] || [];
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};
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exports.FieldIndexer = FieldIndexer;
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})();
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