"use strict"

window.Formats = (function () {
  async function csvParser (file, separator=",") {
    const txt = await file.text();
    const rows = txt.split("\n");
    const headers = rows.shift().split(separator).map(x => x.toLowerCase());
    const data =  rows.filter(a => a.trim()!=="").map(r=>r.split(separator));
    return {
      headers,
      data,
      iterator: function* (sortf){
        const dataset = sortf? this.data.sort(sortf):this.data;
        for (const d of dataset)
          yield Object.fromEntries(d.map((a, i) => [this.headers[i], a]));
      }};
  }
  return {csvParser};
})();