Function _parsePosition

esm/gsap-core.js:577–612

(animation, position, percentAnimation)

  totalDuration: _emptyFunc
},
    _parsePosition = function _parsePosition(animation, position, percentAnimation) {
  var labels = animation.labels,
      recent = animation._recent || _zeroPosition,
      clippedDuration = animation.duration() >= _bigNum ? recent.endTime(false) : animation._dur,
      //in case there's a child that infinitely repeats, users almost never intend for the insertion point of a new child to be based on a SUPER long value like that so we clip it and assume the most recently-added child's endTime should be used instead.
  i,
      offset,
      isPercent;

  if (_isString(position) && (isNaN(position) || position in labels)) {
    //if the string is a number like "1", check to see if there's a label with that name, otherwise interpret it as a number (absolute value).
    offset = position.charAt(0);
    isPercent = position.substr(-1) === "%";
    i = position.indexOf("=");

    if (offset === "<" || offset === ">") {
      i >= 0 && (position = position.replace(/=/, ""));
      return (offset === "<" ? recent._start : recent.endTime(recent._repeat >= 0)) + (parseFloat(position.substr(1)) || 0) * (isPercent ? (i < 0 ? recent : percentAnimation).totalDuration() / 100 : 1);
    }

    if (i < 0) {
      position in labels || (labels[position] = clippedDuration);
      return labels[position];
    }

    offset = parseFloat(position.charAt(i - 1) + position.substr(i + 1));

    if (isPercent && percentAnimation) {
      offset = offset / 100 * (_isArray(percentAnimation) ? percentAnimation[0] : percentAnimation).totalDuration();
    }

    return i > 1 ? _parsePosition(animation, position.substr(0, i - 1), percentAnimation) + offset : clippedDuration + offset;
  }

  return position == null ? clippedDuration : +position;
},
    _createTweenType = function _createTweenType(type, params, timeline) {
  var isLegacy = _isNumber(params[1]),
      varsIndex = (isLegacy ? 2 : 1) + (type < 2 ? 0 : 1),