@gouvfr/dsfr-roller/src/script/main/minisearch/filter-engine.js

Le module `dsfr-roller` permet de publier le site de documentation du Système de Design de l’État - DSFR

import MiniSearch from 'minisearch';
import { normalizeTerm } from '@gouvfr/dsfr-kit';

const ROOT_REGEX = /^(?<root>\/(?<version>v\d+\.\d+|[\w-]+)\/(?<locale>[a-zA-Z-]+))/;

class FilterEngine {
  async init (type) {
    const response = await fetch(this.getFilterIndex(type));
    this._documentJSON = await response.json();
    this._document = JSON.stringify(this._documentJSON);
    this._miniSearch = MiniSearch.loadJSON(this._document, {fields: this.getFields(), storeFields: this.getFields()});
  }

  getFilterIndex = (type) => {
    const { groups: { root, version, locale } } = window.location.pathname.match(ROOT_REGEX);
    return `${root}/${type}.json`;
  }

  getFields = () => {
    const fields = Object.keys(this._documentJSON.fieldIds || {});
    return fields;
  }

  getOptions = (filter = null) => {
    const options = {
      prefix: true,
      fuzzy: 0.1,
      processTerm: (term) => normalizeTerm(term.toLowerCase()),
      tokenize: (string) => string.split(/\s+/)
    };

    if (filter) {
      options.filter = (result) => {
        return Object.entries(filter).every(([key, value]) => result[key] === value);
      };
    }

    return options;
  }

  search (query, filter) {
    if (query === '' || query == null || query.trim().length === 0) {
      return Object.values(this._documentJSON.storedFields).filter(result => {
        return Object.entries(filter).every(([key, value]) => result[key] === value);
      });
    } else {
      const results = this._miniSearch.search(query, this.getOptions(filter));
      return results;
    }
  }
}

export { FilterEngine };