Function doHumanization

pwa/utils/con/humanize-duration.js:120–241

(ms, options)

  // doHumanization does the bulk of the work.
  function doHumanization(ms, options) {
    var i, len, piece;

    // Make sure we have a positive number.
    // Has the nice sideffect of turning Number objects into primitives.
    ms = Math.abs(ms);

    var dictionary = getDictionary(options);
    var pieces = [];

    // Start at the top and keep removing units, bit by bit.
    var unitName, unitMS, unitCount;
    for (i = 0, len = options.units.length; i < len; i++) {
      unitName = options.units[i];
      unitMS = options.unitMeasures[unitName];

      // What's the number of full units we can fit?
      if (i + 1 === len) {
        if (has(options, "maxDecimalPoints")) {
          // We need to use this expValue to avoid rounding functionality of toFixed call
          var expValue = Math.pow(10, options.maxDecimalPoints);
          var unitCountFloat = ms / unitMS;
          unitCount = parseFloat(
            (Math.floor(expValue * unitCountFloat) / expValue).toFixed(
              options.maxDecimalPoints
            )
          );
        } else {
          unitCount = ms / unitMS;
        }
      } else {
        unitCount = Math.floor(ms / unitMS);
      }

      // Add the string.
      pieces.push({
        unitCount: unitCount,
        unitName: unitName,
      });

      // Remove what we just figured out.
      ms -= unitCount * unitMS;
    }

    var firstOccupiedUnitIndex = 0;
    for (i = 0; i < pieces.length; i++) {
      if (pieces[i].unitCount) {
        firstOccupiedUnitIndex = i;
        break;
      }
    }

    if (options.round) {
      var ratioToLargerUnit, previousPiece;
      for (i = pieces.length - 1; i >= 0; i--) {
        piece = pieces[i];
        piece.unitCount = Math.round(piece.unitCount);