Function getVListChildrenAndDepth

static/katex/katex.mjs:5646–5707

(params)

// This helper function for makeVList makes it easier to enforce type safety by
// allowing early exits (returns) in the logic.
const getVListChildrenAndDepth = function getVListChildrenAndDepth(params) {
  if (params.positionType === "individualShift") {
    const oldChildren = params.children;
    const children = [oldChildren[0]]; // Add in kerns to the list of params.children to get each element to be
    // shifted to the correct specified shift

    const depth = -oldChildren[0].shift - oldChildren[0].elem.depth;
    let currPos = depth;

    for (let i = 1; i < oldChildren.length; i++) {
      const diff = -oldChildren[i].shift - currPos - oldChildren[i].elem.depth;
      const size = diff - (oldChildren[i - 1].elem.height + oldChildren[i - 1].elem.depth);
      currPos = currPos + diff;
      children.push({
        type: "kern",
        size
      });
      children.push(oldChildren[i]);
    }

    return {
      children,
      depth
    };
  }

  let depth;

  if (params.positionType === "top") {
    // We always start at the bottom, so calculate the bottom by adding up
    // all the sizes
    let bottom = params.positionData;

    for (let i = 0; i < params.children.length; i++) {
      const child = params.children[i];
      bottom -= child.type === "kern" ? child.size : child.elem.height + child.elem.depth;
    }

    depth = bottom;
  } else if (params.positionType === "bottom") {
    depth = -params.positionData;
  } else {
    const firstChild = params.children[0];

    if (firstChild.type !== "elem") {
      throw new Error('First child must have type "elem".');
    }

    if (params.positionType === "shift") {
      depth = -firstChild.elem.depth - params.positionData;
    } else if (params.positionType === "firstBaseline") {
      depth = -firstChild.elem.depth;
    } else {
      throw new Error(`Invalid positionType ${params.positionType}.`);
    }
  }

  return {