Function _parseScrollModifiers

www/js/_hyperscript.js:6250–6282

(parser)

    }
  };
  function _parseScrollModifiers(parser) {
    parser.matchToken("the");
    var verticalPosition = parser.matchAnyToken("top", "middle", "bottom");
    var horizontalPosition = parser.matchAnyToken("left", "center", "right");
    if (verticalPosition || horizontalPosition) {
      parser.requireToken("of");
    }
    var target = parser.requireElement("unaryExpression");
    var plusOrMinus = parser.matchAnyOpToken("+", "-");
    var offset;
    if (plusOrMinus) {
      parser.pushFollow("px");
      try {
        offset = parser.requireElement("expression");
      } finally {
        parser.popFollow();
      }
    }
    parser.matchToken("px");
    var container;
    if (parser.matchToken("in")) {
      container = parser.requireElement("unaryExpression");
    }
    var smoothness = parser.matchAnyToken("smoothly", "instantly");
    var scrollOptions = { block: "start", inline: "nearest" };
    var blockMap = { top: "start", bottom: "end", middle: "center" };
    var inlineMap = { left: "start", center: "center", right: "end" };
    var behaviorMap = { smoothly: "smooth", instantly: "instant" };
    if (verticalPosition) scrollOptions.block = blockMap[verticalPosition.value];
    if (horizontalPosition) scrollOptions.inline = inlineMap[horizontalPosition.value];
    if (smoothness) scrollOptions.behavior = behaviorMap[smoothness.value];
    return { target, offset, plusOrMinus, scrollOptions, container };
  }
  function _parseSmoothness(parser) {
    var smoothness = parser.matchAnyToken("smoothly", "instantly");
    if (!smoothness) return void 0;