Function parseArray

static/katex/katex.mjs:9205–9296

* 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 = _ref.hskipBeforeAndAfter,
      addJot = _ref.addJot,
      cols = _ref.cols,
      arraystretch = _ref.arraystretch;
  // Parse body of array with \\ temporarily mapped to \cr
  parser.gullet.beginGroup();
  parser.gullet.macros.set("\\\\", "\\cr"); // 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 ParseError(`Invalid \\arraystretch: ${stretch}`);
      }
    }
  }

  let row = [];
  const body = [row];
  const rowGaps = [];
  const hLinesBeforeRow = []; // Test for \hline at the top of the array.

  hLinesBeforeRow.push(getHLines(parser));

  while (true) {
    // eslint-disable-line no-constant-condition
    let cell = parser.parseExpression(false, "\\cr");
    cell = {
      type: "ordgroup",
      mode: parser.mode,
      body: cell
    };

    if (style) {
      cell = {
        type: "styling",
        mode: parser.mode,
        style,
        body: [cell]
      };
    }

    row.push(cell);
    const next = parser.nextToken.text;

    if (next === "&") {
      parser.consume();
    } else if (next === "\\end") {
      // Arrays terminate newlines with `\crcr` which consumes a `\cr` if
      // the last line is empty.
      // NOTE: Currently, `cell` is the last item added into `row`.