Function makeVList

static/katex/katex.mjs:5716–5810

(params, options)

const makeVList = function makeVList(params, options) {
  const _getVListChildrenAndD = getVListChildrenAndDepth(params),
        children = _getVListChildrenAndD.children,
        depth = _getVListChildrenAndD.depth; // Create a strut that is taller than any list item. The strut is added to
  // each item, where it will determine the item's baseline. Since it has
  // `overflow:hidden`, the strut's top edge will sit on the item's line box's
  // top edge and the strut's bottom edge will sit on the item's baseline,
  // with no additional line-height spacing. This allows the item baseline to
  // be positioned precisely without worrying about font ascent and
  // line-height.


  let pstrutSize = 0;

  for (let i = 0; i < children.length; i++) {
    const child = children[i];

    if (child.type === "elem") {
      const elem = child.elem;
      pstrutSize = Math.max(pstrutSize, elem.maxFontSize, elem.height);
    }
  }

  pstrutSize += 2;
  const pstrut = makeSpan(["pstrut"], []);
  pstrut.style.height = pstrutSize + "em"; // Create a new list of actual children at the correct offsets

  const realChildren = [];
  let minPos = depth;
  let maxPos = depth;
  let currPos = depth;

  for (let i = 0; i < children.length; i++) {
    const child = children[i];

    if (child.type === "kern") {
      currPos += child.size;
    } else {
      const elem = child.elem;
      const classes = child.wrapperClasses || [];
      const style = child.wrapperStyle || {};
      const childWrap = makeSpan(classes, [pstrut, elem], undefined, style);
      childWrap.style.top = -pstrutSize - currPos - elem.depth + "em";

      if (child.marginLeft) {
        childWrap.style.marginLeft = child.marginLeft;
      }

      if (child.marginRight) {
        childWrap.style.marginRight = child.marginRight;
      }

      realChildren.push(childWrap);
      currPos += elem.height + elem.depth;
    }

    minPos = Math.min(minPos, currPos);
    maxPos = Math.max(maxPos, currPos);