Function parseArray

src/environments/array.ts:89–266

* 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: Parser,
    {
        hskipBeforeAndAfter,
        addJot,
        cols,
        arraystretch,
        colSeparationType,
        autoTag,
        singleRow,
        emptySingleRow,
        maxNumCols,
        leqno,
    }: {
        hskipBeforeAndAfter?: boolean;
        addJot?: boolean;
        cols?: AlignSpec[];
        arraystretch?: number;
        colSeparationType?: ColSeparationType;
        autoTag?: boolean | null | undefined;
        singleRow?: boolean;
        emptySingleRow?: boolean;
        maxNumCols?: number;
        leqno?: boolean;
    },
    style: StyleStr,
)

 * ("text", "display", etc.), then each cell is cast into that style.
 */
function parseArray(
    parser: Parser,
    {
        hskipBeforeAndAfter,
        addJot,
        cols,
        arraystretch,
        colSeparationType,
        autoTag,
        singleRow,
        emptySingleRow,
        maxNumCols,
        leqno,
    }: {
        hskipBeforeAndAfter?: boolean;
        addJot?: boolean;
        cols?: AlignSpec[];
        arraystretch?: number;
        colSeparationType?: ColSeparationType;
        autoTag?: boolean | null | undefined;
        singleRow?: boolean;
        emptySingleRow?: boolean;
        maxNumCols?: number;
        leqno?: boolean;
    },
    style: StyleStr,
): ParseNode<"array"> {
    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 ParseError(`Invalid \\arraystretch: ${stretch}`);
            }
        }
    }

    // Start group for first cell
    parser.gullet.beginGroup();

    let row: AnyParseNode[] = [];
    const body: AnyParseNode[][] = [row];
    const rowGaps = [];
    const hLinesBeforeRow = [];
    const tags: Array<AnyParseNode[] | boolean> | undefined =
        (autoTag != null ? [] : undefined);