@ifct2017/energies/index.js

Metabolizeable energy conversion factors.

const path = require('path');
const lunr = require('lunr');
const esql = require('sql-extra');

var corpus = null;
var index  = null;




function createIndex() {
  return lunr(function() {
    this.ref('component');
    this.field('component');
    for (var r of corpus.values())
      this.add(r);
  });
}

function load() {
  if (corpus) return corpus;
  corpus = require('./corpus');
  index  = createIndex();
  return corpus;
}

function csv() {
  return path.join(__dirname, 'index.csv');
}

function sql(tab='energies', opt={}) {
  return esql.setupTable(tab, {component: 'TEXT', kj: 'REAL', kcal: 'REAL'}, require('./corpus').values(),
    Object.assign({pk: 'component', index: true, tsvector: {component: 'A'}}, opt));
}


function energies(txt) {
  if (!corpus) load();
  var a  = [], txt = txt.replace(/\W/g, ' ');
  var ms = index.search(txt), max = 0;
  for (var m of ms)
    max = Math.max(max, Object.keys(m.matchData.metadata).length);
  for (var m of ms)
    if (Object.keys(m.matchData.metadata).length===max) a.push(corpus.get(m.ref));
  return a;
}
energies.load = load;
energies.csv  = csv;
energies.sql  = sql;
module.exports = energies;