Function parseArray

katex/katex.js:10612–10773

* Parse the body of the environment, with rows delimited by \\ and * columns delimited by &, and create a nested list in row-major order * with one group per cell. If given an optional argument style * ("text", "display", etc.), then each cell is cast into that style.

(parser, _ref, style)

function parseArray(parser, _ref, style) {
  let {
    hskipBeforeAndAfter,
    addJot,
    cols,
    arraystretch,
    colSeparationType,
    autoTag,
    singleRow,
    emptySingleRow,
    maxNumCols,
    leqno
  } = _ref;
  parser.gullet.beginGroup();

  if (!singleRow) {
    // \cr is equivalent to \\ without the optional size argument (see below)
    // TODO: provide helpful error when \cr is used outside array environment
    parser.gullet.macros.set("\\cr", "\\\\\\relax");
  } // Get current arraystretch if it's not set by the environment


  if (!arraystretch) {
    const stretch = parser.gullet.expandMacroAsText("\\arraystretch");

    if (stretch == null) {
      // Default \arraystretch from lttab.dtx
      arraystretch = 1;
    } else {
      arraystretch = parseFloat(stretch);

      if (!arraystretch || arraystretch < 0) {
        throw new src_ParseError("Invalid \\arraystretch: " + stretch);
      }
    }
  } // Start group for first cell


  parser.gullet.beginGroup();
  let row = [];
  const body = [row];
  const rowGaps = [];
  const hLinesBeforeRow = [];
  const tags = autoTag != null ? [] : undefined; // amsmath uses \global\@eqnswtrue and \global\@eqnswfalse to represent
  // whether this row should have an equation number.  Simulate this with
  // a \@eqnsw macro set to 1 or 0.

  function beginRow() {
    if (autoTag) {
      parser.gullet.macros.set("\\@eqnsw", "1", true);
    }
  }

  function endRow() {
    if (tags) {
      if (parser.gullet.macros.get("\\df@tag")) {
        tags.push(parser.subparse([new Token("\\df@tag")]));
        parser.gullet.macros.set("\\df@tag", undefined, true);