Mediäval-, Versal- und Tabellenziffern

// A row starting '=' is a total (header cells: a light rule above it), '+' heads a group.
const C = (content, align = 'left', extra = {}) => ({ content, align, ...extra });
function account(tsv) {
  const rows = tsv.replace(/^\n+|\n+$/g, '').split('\n').map((line) => {
    const total = line.startsWith('='), group = line.startsWith('+');
    const [item, dollar, amount, fraction, remark] = line.replace(/^[=+]/, '').split('\t');
    if (group) return [C(item, 'left', { colSpan: 5, isHeader: true }),
      ...[1, 2, 3, 4].map(() => C('', 'left', { hiddenBy: { row: -1, col: 0 } }))];
    const h = { isHeader: total };
    return [C(item, 'left', h), C(dollar ? '\\$' : '', 'right', h), // `$` alone opens maths
      C(amount ?? '', 'right', h), C(fraction ?? '', 'left', h), C(remark ?? '', 'left', h)];
  });
  rows.forEach((row, r) => row.forEach((cell) => cell.hiddenBy && (cell.hiddenBy.row = r)));
  return { rows, headerRowCount: 0, columnWidths: [34, 2.4, 8, 3.6, 35] };
}
const accounts = String.raw`=== house
Boards,	$	8.03	½	mostly shanty boards.
Refuse shingles for roof sides,		4.00
Laths,		1.25
Two second-hand windows with glass,		2.43
One thousand old brick,		4.00
Two casks of lime,		2.40		That was high.
Hair,		0.31		More than I needed.
Mantle-tree iron,		0.15
Nails,		3.90
Hinges and screws,		0.14
Latch,		0.10
Chalk,		0.01
Transportation,		1.40		I carried a good part on my back.
=In all,	$	28.12	½
=== farm
	$	23.44
Deducting the outgoes,		14.72	½
=There are left,	$	8.71	½
=== food
Rice,	$	1.73	½
Molasses,		1.73		Cheapest form of the saccharine.
Rye meal,		1.04	¾
Indian meal,		0.99	¾	Cheaper than rye.
Pork,		0.22
+All experiments which failed:
Flour,		0.88		Costs more than Indian meal, both money and trouble.
Sugar,		0.80
Lard,		0.65
Apples,		0.25
Dried apple,		0.22
Sweet potatoes,		0.10
One pumpkin,		0.06
One watermelon,		0.02
Salt,		0.03
=== outgoes
House,	$	28.12	½
Farm one year,		14.72	½
Food eight months,		8.74
Clothing, etc., eight months,		8.40	¾
Oil, &c., eight months,		2.00
=In all,	$	61.99	¾
=== income
	$	23.44
Earned by day-labor,		13.34
=In all,	$	36.78
`; // content.accounts.<lang>.md: one block per table
const tables = Object.fromEntries(accounts.split(/^=== /m).filter(Boolean)
  .map((block) => [block.slice(0, block.indexOf('\n')).trim(), block.slice(block.indexOf('\n'))]));

const at = (to, edge, y, x = 0) => ({ anchor: { to, edge }, offset: { x: mm(x), y: mm(y) } });
// 'below' starts a text at the left edge of what it hangs from: the texts take the measure
// and start half the difference to the left of the vignette, so they centre on the page.
const centred = (to, y) => ({ ...at(to, 'below', y, (VIGNETTE - MEASURE) / 2),
  size: { width: mm(MEASURE) } });
const opener = { enabled: true, minHeight: pt(19 * LEAD), slot: { elements: [
  { kind: 'image', id: 'cabin', resourceId: 'cabin',
    placement: { ...at('container', 'top', 0), size: { width: mm(VIGNETTE) } } },
  { kind: 'text', id: 'kicker', content: '{attr.kicker}', fontFamily: LABEL, fontWeight: 500,
    fontSize: pt(7.5), letterSpacing: pt(1.5), textTransform: 'uppercase', color: col('accent'),
    align: 'center', placement: centred('#cabin', 6) },
  { kind: 'text', id: 'title', content: '{titleText}', fontFamily: CAPS, fontSize: pt(30),
    letterSpacing: pt(1.2), lineHeight: 1, color: col('ink'), align: 'center',
    placement: { ...at('#kicker', 'below', 2.5), size: { width: mm(MEASURE) } } },
  // A design text names its own family, so it states its figures too.
  { kind: 'text', id: 'dates', content: '{attr.dates}', fontFamily: CAPS, fontSize: pt(11),
    letterSpacing: pt(0.8), color: col('accent'), align: 'center', figureStyle: 'lining',
    placement: { ...at('#title', 'below', 2.5), size: { width: mm(MEASURE) } } },
] } };

const head = (id, content, parity, edge, x, extra = {}) => ({
  kind: 'text', id, content, parity, pages: 'body', fontFamily: LABEL, fontSize: pt(7.5),
  fontWeight: 500, letterSpacing: pt(1.2), textTransform: 'uppercase', color: col('muted'),
  placement: { anchor: { to: 'page', edge }, offset: { x: mm(x), y: mm(13) } }, ...extra });
const folio = { fontFamily: TEXT, fontSize: pt(9.5), fontWeight: 400, letterSpacing: pt(0),
  color: col('ink') };
const header = { elements: [
  head('verso-folio', '{pageNumber}', 'even', 'top-left', OUTER, folio),
  head('verso-title', '{title}', 'even', 'top-left', OUTER + 8),
  head('recto-title', '{firstMark.h2}', 'odd', 'top-right', -(OUTER + 8)),
  head('recto-folio', '{pageNumber}', 'odd', 'top-right', -OUTER, folio),
] };
const footer = { elements: [head('drop-folio', '{pageNumber}', 'all', 'top', 0, {
  ...folio, pages: 'opener', placement: at('container', 'top', 8) })] };