80 lines
3.2 KiB
JavaScript
80 lines
3.2 KiB
JavaScript
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/**
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* export the module via AMD, CommonJS or as a browser global
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* Export code from https://github.com/umdjs/umd/blob/master/returnExports.js
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*/
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;(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define(factory)
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} else if (typeof exports === 'object') {
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/**
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* Node. Does not work with strict CommonJS, but
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* only CommonJS-like environments that support module.exports,
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* like Node.
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*/
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module.exports = factory()
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} else {
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// Browser globals (root is window)
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factory()(root.lunr);
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}
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}(this, function () {
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/**
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* Just return a value to define the module export.
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* This example returns an object, but the module
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* can return a function as the exported value.
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*/
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return function(lunr) {
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/* Set up the pipeline for indexing content in multiple languages. The
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corresponding lunr.{lang} files must be loaded before calling this
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function; English ('en') is built in.
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Returns: a lunr plugin for use in your indexer.
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Known drawback: every word will be stemmed with stemmers for every
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language. This could mean that sometimes words that have the same
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stemming root will not be stemmed as such.
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*/
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lunr.multiLanguage = function(/* lang1, lang2, ... */) {
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var languages = Array.prototype.slice.call(arguments);
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var nameSuffix = languages.join('-');
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var wordCharacters = "";
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var pipeline = [];
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var searchPipeline = [];
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for (var i = 0; i < languages.length; ++i) {
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if (languages[i] == 'en') {
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wordCharacters += '\\w';
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pipeline.unshift(lunr.stopWordFilter);
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pipeline.push(lunr.stemmer);
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searchPipeline.push(lunr.stemmer);
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} else {
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wordCharacters += lunr[languages[i]].wordCharacters;
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if (lunr[languages[i]].stopWordFilter) {
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pipeline.unshift(lunr[languages[i]].stopWordFilter);
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}
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if (lunr[languages[i]].stemmer) {
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pipeline.push(lunr[languages[i]].stemmer);
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searchPipeline.push(lunr[languages[i]].stemmer);
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}
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}
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};
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var multiTrimmer = lunr.trimmerSupport.generateTrimmer(wordCharacters);
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lunr.Pipeline.registerFunction(multiTrimmer, 'lunr-multi-trimmer-' + nameSuffix);
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pipeline.unshift(multiTrimmer);
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return function() {
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this.pipeline.reset();
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this.pipeline.add.apply(this.pipeline, pipeline);
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// for lunr version 2
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// this is necessary so that every searched word is also stemmed before
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// in lunr <= 1 this is not needed, as it is done using the normal pipeline
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if (this.searchPipeline) {
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this.searchPipeline.reset();
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this.searchPipeline.add.apply(this.searchPipeline, searchPipeline);
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}
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};
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}
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}
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}));
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