@botonic/plugin-contentful/lib/esm/nlp/stemmer.js

## What Does This Plugin Do?

import { SingletonMap } from '../util';
import * as locales from './locales';
import { languageFromLocale } from './locales';
// see https://github.com/axa-group/nlp.js/blob/HEAD/docs/language-support.md
// and https://stackoverflow.com/a/11210358/145289
// snowball algorithm inspired from https://github.com/MihaiValentin/lunr-languages, based on
// https://github.com/fortnightlabs/snowball-js/blob/master/stemmer/src/ext/SpanishStemmer.js based on
// java version at http://snowball.tartarus.org/download.html
const stemmers = new SingletonMap({
    [locales.CATALAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerCa = require('@nlpjs/lang-ca/src/stemmer-ca');
        return new StemmerCa();
    },
    [locales.ENGLISH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerEn = require('@nlpjs/lang-en-min/src/stemmer-en');
        return new StemmerEn();
    },
    [locales.SPANISH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerEs = require('@nlpjs/lang-es/src/stemmer-es');
        return new StemmerEs();
    },
    [locales.POLISH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerPl = require('@nlpjs/lang-pl/src/stemmer-pl');
        return new StemmerPl();
    },
    [locales.PORTUGUESE]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerPt = require('@nlpjs/lang-pt/src/stemmer-pt');
        return new StemmerPt();
    },
    [locales.RUSSIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerRu = require('@nlpjs/lang-ru/src/stemmer-ru');
        return new StemmerRu();
    },
    [locales.TURKISH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerTr = require('@nlpjs/lang-tr/src/stemmer-tr');
        return new StemmerTr();
    },
    [locales.ITALIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerIt = require('@nlpjs/lang-it/src/stemmer-it');
        return new StemmerIt();
    },
    [locales.FRENCH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerFr = require('@nlpjs/lang-fr/src/stemmer-fr');
        return new StemmerFr();
    },
    [locales.GERMAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerDe = require('@nlpjs/lang-de/src/stemmer-de');
        return new StemmerDe();
    },
    [locales.ROMANIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerRo = require('@nlpjs/lang-ro/src/stemmer-ro');
        return new StemmerRo();
    },
    [locales.GREEK]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerEl = require('@nlpjs/lang-el/src/stemmer-el');
        return new StemmerEl();
    },
    [locales.CZECH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerCs = require('@nlpjs/lang-cs/src/stemmer-cs');
        return new StemmerCs();
    },
    [locales.UKRAINIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires,node/no-missing-require
        const { StemmerUk } = require('./stemmers/stemmer-uk');
        return new StemmerUk();
    },
    [locales.CROATIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires,node/no-missing-require
        const { StemmerHr } = require('./stemmers/stemmer-hr');
        return new StemmerHr();
    },
    [locales.SLOVAK]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires,node/no-missing-require
        const { StemmerSk } = require('./stemmers/stemmer-sk');
        return new StemmerSk();
    },
    [locales.SLOVENIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerSl = require('@nlpjs/lang-sl/src/stemmer-sl');
        return new StemmerSl();
    },
    [locales.HUNGARIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerHu = require('@nlpjs/lang-hu/src/stemmer-hu');
        return new StemmerHu();
    },
    [locales.DUTCH]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const StemmerNl = require('@nlpjs/lang-nl/src/stemmer-nl');
        return new StemmerNl();
    },
    [locales.BULGARIAN]: () => {
        // eslint-disable-next-line @typescript-eslint/no-var-requires,node/no-missing-require
        const { StemmerBg } = require('./stemmers/stemmer-bg');
        return new StemmerBg();
    },
});
export function stemmerFor(locale) {
    const stem = stemmers.value(languageFromLocale(locale));
    if (!stem) {
        throw new Error(`No stemmer configured for locale '${locale}'`);
    }
    return stem;
}
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