elizabeth-index.js

'use strict';

// import the file reader
const fs = require('fs');

class Index {
  // method to read the json file
  readJSONFromFile(filePath) {
    this.books = JSON.parse(fs.readFileSync(filePath));
  }

  createIndex() {
    this.indexArray = [];
    this.books.forEach((book, docIndex) => {
      var bookObjectString = JSON.stringify(book).toLowerCase().replace(/\W/g, ' ').replace(/\s+/g, ' ').trim();
      // console.log('++' + bookObjectString + '++');

      this.indexArray = this.indexArray.concat(bookObjectString.split(' ').map((word, wordIndex) => {
        return (word + ' : ' + docIndex + ' : ' + wordIndex);
      }));
    });
  }

  getIndex() {
    return this.indexArray;
  }

  searchIndex(term) {
    var results = this.indexArray.filter(wordStatistics => {
      const wordToSearch = new RegExp(term, 'gi');
      // if a true boolean is returned, wordStatistics is added to results array
      return wordToSearch.test(wordStatistics);
    });

    if (results.length === 0) {
      console.log('No match has been made');
      return;
    }

    return results;
  }
}

// var index = new Index();
// index.readJSONFromFile('book.json');
// index.createIndex();
// console.log(index.getIndex());
// console.log(index.getIndex().length);
// console.log(index.searchIndex('and'));

exports.module = Index;