Poemes Tang davant de la versió anglesa

// ═══ Postext Cookbook · Nº 083 · Tang poems facing their English verse ═══════════════
// https://postext.dev/en/cookbook/tang-poems-facing-english
// Code: MIT · Text: Tang poems, zh.wikisource; H. A. Giles, 1901, Project Gutenberg (PD)
// Fonts: Noto Serif TC, LXGW WenKai TC, Noto Sans TC, Source Serif 4 (OFL) · Needs postext ≥ 1.11.0
import { buildDocument, renderPageToCanvas, clearMeasurementCache } from 'https://esm.sh/postext';
import { renderToPdf, decompressWoff2 } from 'https://esm.sh/postext-pdf';

const LANG = 'es'; // @lang: the language of the sample document ('en' | 'es')
const RECIPE = 'tang-poems-facing-english';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
// Ink and seal red on a cream paper, and a pale moon for the title page.
const palette = {
  ink: '#1f1b18', // text: a warm near-black
  seal: '#ad3526', // the accent: vermilion seal paste, for the poets, the rules and the seal
  moon: '#eadcb4', // the title page's moon
  leaf: '#f2e8cf', // the recto's tint, under the Chinese
  muted: '#6d655c', // running heads and the colophon
  paper: '#faf6ed', // a cream paper
};
const col = (id) => ({ hex: palette[id], model: 'hex', paletteId: id });
const colorPalette = [
  ...Object.entries(palette).map(([id, hex]) => ({ id, name: id, value: { hex, model: 'hex' } })),
  { id: 'main-color', name: 'seal (defaults)', value: { hex: palette.seal, model: 'hex' } },
];
const SERIF = 'Noto Serif TC'; // 明: the Chinese titles and the notes
const KAI = 'LXGW WenKai TC'; // 楷: the poems
const HEI = 'Noto Sans TC'; // 黑: the poet lines and the recto's running head
const ROMAN = 'Source Serif 4'; // the English: the Latin that Noto Serif TC is built on
const LABEL = 'Source Sans 3'; // English labels and folios
const [BODY, LEAD, SHI] = [10.5, 16, 16]; // pt: 五号 on a 16 pt pitch; the poems' size
const [CHARS, LINES] = [28, 30]; // the character grid: 28 ems by 30 lines
const TRIM = { width: 148, height: 210 }; // mm: 25開, a Taiwan trade trim
const [INNER, OUTER] = [18, 21]; // mm: minimum sides; the grid centres its measure between them
const MEASURE = (CHARS * BODY * 25.4) / 72; // 103.7 mm: 28 ems of 五号
const EDGE = OUTER + (TRIM.width - INNER - OUTER - MEASURE) / 2; // 23.6 mm: the outer text edge

// #region answer: the English opens the next verso, the Chinese the recto that faces it
const SINK = 6; // lines of LEAD under both titles, so the two poems start on the same line
const at = (y) => ({ anchor: { to: 'container', edge: 'top' }, offset: { y: mm(y) } });
// A title whose foot is 23 mm down at any size, and the poet's line under it at 24 mm.
const titled = (size, title, poet, under = []) => ({
  enabled: true, minHeight: pt(SINK * LEAD),
  slot: { elements: [...under,
    { kind: 'text', id: 'title', content: '{titleText}', fontSize: pt(size), lineHeight: 1.2,
      align: 'center', overflow: 'wrap', color: col('ink'),
      placement: at(23 - (size * 1.2 * 25.4) / 72), ...title },
    { kind: 'text', id: 'poet', align: 'center', overflow: 'wrap', color: col('seal'),
      placement: at(24), ...poet },
  ] },
});
// Each style breaks to its own side of the spread (gotcha: style-inherits-break).
const english = { id: 'en', breakBefore: { enabled: true, parity: 'even' }, // a verso
  advancedDesign: titled(19, { fontFamily: ROMAN, italic: true },
    { content: '{attr.kicker}', fontFamily: LABEL, fontSize: pt(7.5), fontWeight: 600,
      letterSpacing: pt(1.5), textTransform: 'uppercase' }) };
// The original on a tinted leaf: span 'page' lets the tint reach past the text column.
const chinese = { id: 'zh', span: 'page', breakBefore: { enabled: true, parity: 'odd' },
  advancedDesign: titled(28, { fontFamily: SERIF, fontWeight: 700, letterSpacing: pt(7) },
    { content: '{attr.poet}', fontFamily: HEI, fontSize: pt(9), letterSpacing: pt(1.5) },
    [{ kind: 'box', id: 'leaf', reserve: false, style: { backgroundColor: col('leaf') },
      placement: { anchor: { to: 'page', edge: 'top-left' },
        size: { width: 'fill', height: 'fill' } } }]) };
// #endregion

// #region verse: a Chinese row faces two lines of English on the grid both pages share
// Each indent centres the longest line of the poems that use it on the 103.7 mm measure:
// 97.8 mm in the moonlight poem, 91–93 mm in two quatrains, 66 mm in Wang Wei's.
const verses = [['verse-long', 3], ['verse', 6], ['verse-short', 19]].map(([id, indent]) => ({
  id, fontFamily: ROMAN, fontSize: pt(BODY), lineHeight: pt(LEAD), textAlign: 'left',
  firstLineIndent: pt(0), indent: mm(indent) }));
const shi = { id: 'shi', fontFamily: KAI, fontSize: pt(SHI), lineHeight: pt(2 * LEAD),
  textAlign: 'left', firstLineIndent: pt(0), // two lines of verse to a row: 2 × LEAD
  // Five characters and a full-width mark, twice: 12 ems, centred in the 28 of the grid.
  // A fixed left edge, and the note numbers after each row's 。: every character keeps its column.
  indent: pt((CHARS * BODY - 12 * SHI) / 2) };
// A paragraph drops its leading spaces (gap: hard-line-breaks): the two spaces Giles indents
// his rhyming lines by become two em spaces behind a word joiner, which nothing trims.
const indentVerse = (md) => md.replace(/^ {2}(?=\S)/gm, '\u2060\u2003\u2003');
// #endregion

// #region notes: glosses at the foot of the recto, in the edition's language
const footnotes = { placement: 'column', numbering: 'page', // the page foot; ① again on each page
  numberFormat: 'circled-decimal', markerSize: em(0.6), fontSize: pt(8), lineHeight: pt(11),
  color: col('ink'), textAlign: 'left', spaceAbove: pt(LEAD), spaceBelowRule: pt(5),
  spaceBetween: pt(3), separator: { width: 0.12, lineWidth: pt(0.6), color: col('seal') } };
// #endregion

// #region title: 唐詩 on a pale moon, with a seal
const onPage = (y, size) => ({ anchor: { to: 'page', edge: 'top' }, offset: { y: mm(y) },
  ...(size ? { size: { width: mm(size), height: mm(size) } } : {}) });
const [MOON_Y, MOON, HAN] = [36, 78, 60]; // mm: the moon's top and width; pt: the title
const UNDER = MOON_Y + MOON; // mm: the English lines start under the moon
const line = (id, content, y, style) => ({ kind: 'text', id, content, align: 'center',
  overflow: 'wrap', color: col('ink'), placement: onPage(y), ...style });
const titlePage = {
  id: 'title', span: 'page', runningChapter: false,
  header: { elements: [] }, footer: { elements: [] },
  advancedDesign: { enabled: true, slot: { elements: [
    { kind: 'box', id: 'moon', placement: onPage(MOON_Y, MOON),
      style: { backgroundColor: col('moon'), borderRadius: mm(MOON / 2) } },
    line('han', '{titleText}', MOON_Y + MOON / 2 - (HAN * 25.4) / 144, { fontFamily: SERIF,
      fontWeight: 900, fontSize: pt(HAN), letterSpacing: pt(HAN / 4), lineHeight: 1 }),
    line('en', '{attr.en}', UNDER + 10, { fontFamily: LABEL, fontSize: pt(10), fontWeight: 600,
      letterSpacing: pt(3), textTransform: 'uppercase', color: col('seal') }),
    line('poets', '{attr.poets}', UNDER + 19, { fontFamily: ROMAN, fontSize: pt(12) }),
    line('giles', '{attr.english}', UNDER + 26, { fontFamily: ROMAN, fontSize: pt(11),
      italic: true }),
    // A seal reading 明月, the bright moon of three of the four poems, set down its square.
    { kind: 'box', id: 'seal', placement: onPage(170, 13),
      style: { backgroundColor: col('seal'), borderRadius: mm(1) } },
    line('seal-text', '明月', 170, { placement: onPage(170, 13), writingMode: 'vertical-rl',
      fontFamily: KAI, fontSize: pt(14), lineHeight: 1, color: col('paper'),
      verticalAlign: 'middle' }),
  ] } },
};
// #endregion

// #region heads: the book in English over the verso, the poet in Chinese over the recto
const head = (id, content, parity, edge, x, style) => ({ kind: 'text', id, content, parity,
  pages: 'opener', // every poem page opens with its title; a blank page stays bare
  fontFamily: LABEL, fontSize: pt(7.5), fontWeight: 600, color: col('muted'),
  placement: { anchor: { to: 'page', edge }, offset: { x: mm(x), y: mm(12) } }, ...style });
const header = { elements: [
  head('verso-folio', '{pageNumber}', 'even', 'top-left', EDGE, { color: col('ink') }),
  head('verso-book', '{subtitle}', 'even', 'top-left', EDGE + 8,
    { letterSpacing: pt(1.2), textTransform: 'uppercase' }),
  head('recto-poet', '{attr.name}', 'odd', 'top-right', -(EDGE + 8),
    { fontFamily: HEI, fontWeight: 400, fontSize: pt(8), letterSpacing: pt(3) }),
  head('recto-folio', '{pageNumber}', 'odd', 'top-right', -EDGE, { color: col('ink') }),
] };
// #endregion

const paragraphStyles = [shi, ...verses,
  // Justified like the body, and divided by the patterns of the edition's language (bodyText).
  { id: 'prose', fontFamily: ROMAN, fontSize: pt(10), lineHeight: pt(LEAD),
    firstLineIndent: mm(4) },
  { id: 'colophon', fontFamily: LABEL, fontSize: pt(7), lineHeight: pt(10), color: col('muted'),
    italicColor: col('muted'), textAlign: 'left', firstLineIndent: pt(0), marginTop: pt(LEAD) },
];

const config = () => ({ // a factory: the engine caches resolved configs per object
  locale: 'zh-Hant', // the Chinese sets the rules; written out, never LANG (gotcha: cjk-locale-tag)
  colorPalette,
  page: {
    width: mm(TRIM.width), height: mm(TRIM.height), dpi: 150, backgroundColor: col('paper'),
    // 23 + 17.5 mm leave 169.5 mm for 30 lines of 16 pt (169.3 mm): a head deeper than the foot.
    margins: { top: mm(23), bottom: mm(17.5), left: mm(INNER), right: mm(OUTER), mirror: true },
  },
  layout: { layoutType: 'single' },
  cjk: { grid: { enabled: true, charsPerLine: CHARS, linesPerPage: LINES } },
  bodyText: { fontFamily: SERIF, fontSize: pt(BODY), lineHeight: pt(LEAD), color: col('ink'),
    boldColor: col('ink'), italicColor: col('ink'), referenceColor: col('ink'),
    textAlign: 'justify', firstLineIndent: em(2), indentAfterHeading: false,
    hyphenation: { enabled: true, locale: LANG } }, // no Chinese patterns: the Latin's language
  // The designs paint the titles; weight 400 keeps the heading blocks in a loaded face.
  // Restated: any headings object drops the H1 break (gotcha: headings-drop-h1-break).
  headings: { fontFamily: SERIF, fontWeight: 400, levels: [{ level: 1, marginTop: pt(0),
    marginBottom: pt(0), breakBefore: { enabled: true, parity: 'any' } }] },
  headingStyles: [titlePage, english, chinese],
  paragraphStyles, footnotes, header, footer: { elements: [] },
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
Mostra en Markdown · 153 línies · content.es.md
title: "唐詩"
subtitle: "Poemas Tang"
---

# 唐詩 {style="title" en="Poemas Tang" poets="Li Bai · Du Fu · Wang Wei" english="con la versión inglesa en verso de Herbert A. Giles"}

# Night Thoughts {style="en" kicker="Li Bai · 701–762"}

:::paragraphs{style="verse"}
I wake, and moonbeams play around my bed,

  Glittering like hoar-frost to my wondering eyes;

Up towards the glorious moon I raise my head,

  Then lay me down,—and thoughts of home arise.
:::

# 靜夜思 {style="zh" poet="〔唐〕李白" name="李白"}

:::paragraphs{style="shi"}
牀前明月光，疑是地上霜。[^bed]

舉頭望明月，低頭思故鄉。[^moon]
:::

[^bed]: **牀** chuáng, hoy escrito 床: la cama. Algunos comentaristas leen aquí el brocal de un pozo, y otros un asiento plegable sacado al patio; Giles se queda con la cama.

[^moon]: **明月** míngyuè, la luna clara. Las obras reunidas de Li Bai dicen 看月光 en el primer verso y aquí 山月, la luna sobre los montes; la edición de 1705 de toda la poesía Tang dice también 山月, pero conserva 明月光. Esta página sigue la antología de 1763, el texto que los niños chinos aprenden de memoria. **鄉** xiāng rima con 光 guāng y 霜 shuāng, al final de los dos primeros versos; Giles rima su cuarteta en versos alternos.

# Drinking Alone under the Moon {style="en" kicker="Li Bai · 701–762"}

:::paragraphs{style="verse-long"}
An arbour of flowers and a kettle of wine:

Alas! in the bowers no companion is mine.

Then the moon sheds her rays on my goblet and me,

And my shadow betrays we’re a party of three.

:::space{lines=1}

Though the moon cannot swallow her share of the grog,

And my shadow must follow wherever I jog,—

Yet their friendship I’ll borrow and gaily carouse,

And laugh away sorrow while spring-time allows.

:::space{lines=1}

See the moon,—how she glances response to my song;

See my shadow,—it dances so lightly along!

While sober I feel you are both my good friends;

When drunken I reel, our companionship ends.

But we’ll soon have a greeting without a good-bye,

At our next merry meeting away in the sky.
:::

# 月下獨酌 {style="zh" poet="〔唐〕李白" name="李白"}

:::paragraphs{style="shi"}
花間一壺酒，獨酌無相親。

舉杯邀明月，對影成三人。[^three]

:::space{lines=1}

月既不解飲，影徒隨我身。

暫伴月將影，行樂須及春。[^jiang]

:::space{lines=1}

我歌月徘徊，我舞影零亂。

醒時同交歡，醉後各分散。

永結無情遊，相期邈雲漢。[^wuqing]
:::

[^three]: **三人** sān rén, tres personas: el poeta, la luna y su sombra.

[^jiang]: **將** jiāng: aquí une 月 y 影, la luna y la sombra.

[^wuqing]: **無情遊** wúqíng yóu: una amistad con compañeros que no sienten nada, la luna y la sombra; el poeta se ata a ella para siempre. **雲漢** yúnhàn: la Vía Láctea, donde los tres volverán a encontrarse, el «away in the sky» de Giles. La rima cambia en el noveno verso, donde empieza la tercera estrofa de Giles.

# Stop-short {style="en" kicker="Du Fu · 712–770"}

:::paragraphs{style="verse"}
White gleam the gulls across the darkling tide,

  On the green hills the red flowers seem to burn;

Alas! I see another spring has died….

  When will it come—the day of my return?
:::

# 絕句 {style="zh" poet="〔唐〕杜甫" name="杜甫"}

:::paragraphs{style="shi"}
江碧鳥逾白，山青花欲燃。[^yu]

今春看又過，何日是歸年。[^guinian]
:::

[^yu]: **逾** yú, todavía más: contra el verde del río, los pájaros parecen aún más blancos. **欲燃** yù rán, a punto de arder: el rojo de las flores. En Giles, «seem to burn».

[^guinian]: **歸年** guī nián, el año del regreso. Du Fu escribió esta cuarteta, la segunda de una pareja, en la primavera de 764 en Chengdu, adonde lo había llevado la guerra del norte.

# The Bamboo Lodge {style="en" kicker="Wang Wei · 701–761"}

:::paragraphs{style="verse-short"}
Beneath the bamboo grove, alone,

  I seize my lute and sit and croon;

No ear to hear me, save mine own:

  No eye to see me—save the moon.
:::

# 竹里館 {style="zh" poet="〔唐〕王維" name="王維"}

:::paragraphs{style="shi"}
獨坐幽篁裏，彈琴復長嘯。[^huang]

深林人不知，明月來相照。
:::

[^huang]: **幽篁** yōuhuáng: un bambudal hondo y oscuro. **長嘯** cháng xiào: un silbido largo con los labios fruncidos, arte de ermitaños; el poeta de Giles canturrea («croon»). El Pabellón de los Bambúes era uno de los veinte lugares de la finca de Wang Wei en Wangchuan, al sudeste de la capital Tang, y el poeta dedicó a cada uno una cuarteta de 輞川集, la colección de Wangchuan.

# Nota sobre el texto {style="en" kicker="Sobre esta edición"}

:::paragraphs{style="prose"}
Los poemas chinos siguen los *Trescientos poemas Tang*, la antología que Sun Zhu reunió en 1763 con el nombre de Hengtang Tuishi, salvo la cuarteta de Du Fu, que no figura en ella y se da como la imprime el *Quan Tang shi* de 1705. Los cuatro proceden de Wikisource, en caracteres tradicionales y con las formas antiguas que conservan allí algunos caracteres.

Los versos ingleses son de Herbert A. Giles, tal como los publicó en *A History of Chinese Literature* (1901), donde los poemas no llevan título; los títulos ingleses son de esta edición. Giles escribía Li Po y Tu Fu donde hoy se escribe Li Bai y Du Fu, y llamaba *stop-short* al *jueju*, la cuarteta, de ahí el título inglés del poema de Du Fu. Se respetan sus rimas, sus sangrías y su puntuación; el poema de la luna, que su libro imprimió en hemistiquios, va aquí en versos enteros.

Cada poema chino va a dos versos por renglón, de modo que cada renglón queda frente a los dos versos ingleses que lo traducen. El blanco entre las estrofas del poema de la luna es del editor y está en las dos páginas.
:::

:::paragraphs{style="colophon"}
Compuesto en Noto Serif TC, LXGW WenKai TC y Noto Sans TC para el chino, y en Source Serif 4 y Source Sans 3 para el inglés, todas con la licencia SIL Open Font License · Texto chino: Wikisource · Versos ingleses: H. A. Giles, *A History of Chinese Literature*, 1901, libro electrónico 43711 del Proyecto Gutenberg
:::
`; // content.<lang>.md, inlined by the Cookbook

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = { // every face the pages use, loaded before the build (gotcha: fonts-first)
  'Noto Serif TC': ['400', '700', '900'], // SERIF: the notes; the titles; 唐詩
  'LXGW WenKai TC': ['400'], // KAI: the poems and the seal
  'Noto Sans TC': ['400'], // HEI: the poet lines, the recto's head
  'Source Serif 4': ['400', '400i'], // ROMAN: the verse, the titles, the note on the text
  'Source Sans 3': ['400', '400i', '600'], // LABEL: kickers, the verso's head, folios, colophon
};

// ─── 4 · Build & show ───────────────────────────────────────────────────────
// #region voices: each Chinese face loads the files of the characters it sets
const grab = (re) => (markdown.match(re) ?? []).join('');
const poems = grab(/:::paragraphs\{style="shi"\}[\s\S]*?\n:::/g) + '①②③④⑤⑥⑦⑧⑨⑩'; // and note numbers
await loadFonts(FONTS, markdown);
await Promise.all([
  loadCjkFonts({ [SERIF]: ['400'] }, markdown + poems), // the notes and their ①, the heading blocks
  loadCjkFonts({ [SERIF]: ['700'] }, grab(/^# \S+(?= \{style="zh")|\*\*[^*]+\*\*/gm)),
  loadCjkFonts({ [SERIF]: ['900'] }, grab(/^# \S+(?= \{style="title")/gm)),
  loadCjkFonts({ [KAI]: ['400'] }, `${poems}明月`),
  loadCjkFonts({ [HEI]: ['400'] }, grab(/(?<=(?:poet|name)=")[^"]*/g)),
]);
// #endregion
const doc = await buildWithFonts(
  () => buildDocument({ markdown: indentVerse(markdown) }, config()), markdown);
showPages(doc, { title: t({ en: 'Tang poems facing their English verse',
  es: 'Poemas Tang frente a su versión inglesa' }) });
offerPdf(() => renderToPdf(doc, { fontProvider: cjkPdfProvider }), `${RECIPE}.pdf`);

Kit · core, fonts, viewer, pdf, cjk: igual a totes les receptes · 422 línies
// ─── Kit ── helpers shared by every Cookbook recipe · postext.dev/cookbook ─────

// ─── Kit · core v1 ── the same in every recipe · postext.dev/cookbook ─────────
function mm(value) { return { value, unit: 'mm' }; }
function pt(value) { return { value, unit: 'pt' }; }
function em(value) { return { value, unit: 'em' }; }
/** The sample language's string: t({ en: 'Figure', es: 'Figura' }). */
function t(strings) { return strings[LANG] ?? Object.values(strings)[0]; }
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function asset(file) { return `https://cdn.jsdelivr.net/gh/drnachio/postext@main/cookbook/${RECIPE}/assets/${file}`; }

// ─── Kit · fonts v1 ── the same in every recipe · postext.dev/cookbook ────────
// Postext measures text with the faces the browser has loaded, and caches the
// widths, so every face must be ready before the first build. Faces come from
// Fontsource: the same static files the PDF embeds, so screen and PDF agree.

/** faces = { 'Family Name': ['400', '400i', '700'] }. `text` is the sample:
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/** Runs `build` (a buildDocument or buildBundle call) and checks the faces
 *  the pages use. A regular face missing from FONTS is loaded with a warning;
 *  bold and italic variants are loaded when the family ships them. Then the
 *  measurement caches are cleared and the build runs again. */
async function buildWithFonts(build, text = '') {
  const tried = new Set();
  for (let round = 0; round < 3; round++) {
    kitStatus('Laying out…');
    await new Promise(requestAnimationFrame);          // let the status paint first
    const result = await Promise.resolve().then(build).catch((error) => { kitFail(error); throw error; });
    const wanted = { base: {}, variants: {} };
    for (const { font, base } of [result].flat().flatMap(fontStringsOf)) {
      const { family, weight, style } = parseFont(font);
      const key = `${family}|${weight}|${style}`;
      if (tried.has(key) || hasFace(family, weight, style)) continue;
      tried.add(key);
      (wanted[base ? 'base' : 'variants'][family] ??= []).push(`${weight}${style === 'italic' ? 'i' : ''}`);
    }
    if (Object.keys(wanted.base).length) {
      console.warn(`[cookbook] FONTS does not list ${JSON.stringify(wanted.base)}: loading them.`);
    }
    const added = await loadFonts(wanted.base, text) + await loadFonts(wanted.variants, text, { optional: true });
    if (added === 0) return result;
    clearMeasurementCache();
  }
  throw new Error('The fonts did not settle after three builds.');
}

/** Every font string of the layout. `base` marks a block's own face; its
 *  bold, italic and bold-italic variants are listed whether or not used. */
function fontStringsOf(doc) {
  const found = new Map();
  const walk = (node) => {
    if (!node || typeof node !== 'object') return;
    if (Array.isArray(node)) { node.forEach(walk); return; }
    for (const [key, value] of Object.entries(node)) {
      if (typeof value === 'string' && /fontString$/i.test(key)) {
        found.set(value, found.get(value) || key === 'fontString');
      } else if (value && typeof value === 'object') walk(value);
    }
  };
  walk(doc.pages);
  walk(doc.blocks);
  return [...found].map(([font, base]) => ({ font, base }));
}

/** '700 37.5px Open Sans' / 'italic 400 13px "Source Serif 4"' → { family, weight, style }.
 *  A string with no weight ('95.8px Young Serif', from a design text) is 400. */
function parseFont(font) {
  const m = /^(?:(italic|oblique)\s+)?(?:small-caps\s+)?(?:(\d+|bold|normal)\s+)?[\d.]+px\s+(.+)$/.exec(font.trim());
  if (!m) throw new Error(`Unexpected font string: ${font}`);
  const weight = m[2] === 'bold' ? 700 : !m[2] || m[2] === 'normal' ? 400 : Number(m[2]);
  return { family: m[3].replace(/^["']|["']$/g, ''), weight, style: m[1] ? 'italic' : 'normal' };
}

/** True when a loaded FontFace covers exactly this family, weight and style
 *  (document.fonts.check() is also true for families nobody declared). */
function hasFace(family, weight, style) {
  for (const face of document.fonts) {
    if (face.status !== 'loaded' || face.style !== style) continue;
    if (face.family.replace(/^["']|["']$/g, '') !== family) continue;
    const [low, high = low] = face.weight.split(' ').map(Number);
    if (weight >= low && weight <= high) return true;
  }
  return false;
}

/** Fontsource's id for a family: 'Source Serif 4' → 'source-serif-4'. */
function fontsourceId(family) { return family.toLowerCase().replace(/\s+/g, '-'); }

/** The weights and styles a family ships ({ weights: [400, 700], styles: ['normal', 'italic'] }), or null. */
function fontsourceMeta(family) {
  fontsourceMeta.cache ??= new Map();
  const id = fontsourceId(family);
  if (!fontsourceMeta.cache.has(id)) {
    fontsourceMeta.cache.set(id, fetch(`https://api.fontsource.org/v1/fonts/${id}`)
      .then((res) => (res.ok ? res.json() : null), () => null));
  }
  return fontsourceMeta.cache.get(id);
}

// ─── Kit · viewer v1 ── the same in every recipe · postext.dev/cookbook ───────
/** Shows the pages as facing spreads on a dark desk: the first page is a
 *  recto on its own, then verso | recto pairs, as in a bound book. Pages
 *  are painted when they scroll near the screen. */
function showPages(docs, { title, width = 460 } = {}) {
  const root = viewer(title);
  const pages = [docs].flat().flatMap((doc) =>
    doc.pages.map((page) => ({ doc, page, n: (doc.pageIndexOffset ?? 0) + page.index })));
  const spreads = [];
  let verso = null;
  for (const p of pages) {
    if (p.n % 2 === 1) { if (verso) spreads.push([verso, null]); verso = p; }
    else { spreads.push([verso, p]); verso = null; }
  }
  if (verso) spreads.push([verso, null]);
  const density = Math.min(window.devicePixelRatio || 1, 2);
  showPages.painter?.disconnect();
  const painter = new IntersectionObserver((entries) => {
    for (const { isIntersecting, target } of entries) {
      if (!isIntersecting) continue;
      painter.unobserve(target);
      const { doc, page } = target.postext;
      renderPageToCanvas(page, doc, target, { scale: (width * density) / page.width });
    }
  }, { rootMargin: '800px' });
  showPages.painter = painter;
  root.replaceChildren(...spreads.map((pair) => {
    const spread = document.createElement('div');
    spread.className = 'pt-spread';
    for (const p of pair) {
      const figure = document.createElement('figure');
      if (p) {
        const label = p.page.pageLabel || String(p.n + 1);
        const canvas = document.createElement('canvas');
        canvas.postext = p;
        canvas.style.aspectRatio = `${p.page.width} / ${p.page.height}`;
        canvas.setAttribute('role', 'img');
        canvas.setAttribute('aria-label', `Page ${label}`);
        const folio = document.createElement('figcaption');
        folio.textContent = label;
        figure.append(canvas, folio);
        painter.observe(canvas);
      } else figure.className = 'pt-blank';
      spread.append(figure);
    }
    return spread;
  }));
  kitStatus(`${pages.length} ${pages.length === 1 ? 'page' : 'pages'}`);
  document.documentElement.dataset.postext = 'ready';
  return pages.length;
}

/** The desk, the bar and the error reporting, created once. */
function viewer(title) {
  if (!document.getElementById('pt-kit')) {
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit">
      :root { color-scheme: dark; }
      body { margin: 0; background: #0e1014; color: #b9bcc4; font: 13px/1.45 system-ui, sans-serif; }
      #pt-bar { position: sticky; top: 0; z-index: 1; display: flex; flex-wrap: wrap; align-items: center;
        gap: 6px 16px; padding: 10px 16px; background: rgb(14 16 20 / .92); backdrop-filter: blur(6px);
        border-bottom: 1px solid #23262d; }
      #pt-bar strong { color: #f4f1ea; font-weight: 600; }
      #pt-actions { display: flex; gap: 12px; margin-left: auto; }
      #pt-actions a, #pt-actions button { color: #d8a21a; font: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
      #pages { display: grid; justify-items: center; gap: 48px; padding: 32px 16px 72px; }
      .pt-spread { display: flex; }
      .pt-spread figure { margin: 0; width: min(460px, 44vw); }
      .pt-spread canvas { display: block; width: 100%; background: #fff;
        box-shadow: 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figure:first-child canvas { box-shadow: inset -14px 0 14px -14px rgb(0 0 0 / .18), 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figcaption { margin-top: 10px; text-align: center; font: 600 10px/1 system-ui, sans-serif;
        letter-spacing: .18em; text-transform: uppercase; color: #6c7079; }
      .pt-blank { visibility: hidden; }
      @media (max-width: 760px) {
        .pt-spread { flex-direction: column; gap: 32px; }
        .pt-spread figure { width: min(460px, 92vw); }
        .pt-blank { display: none; }
      }
    </style>`);
    document.body.insertAdjacentHTML('afterbegin',
      '<header id="pt-bar"><strong id="pt-title"></strong><span id="pt-status" role="status"></span><span id="pt-actions"></span></header>');
    document.getElementById('pt-title').textContent = document.title || 'Postext';
    addEventListener('error', (event) => kitFail(event.error ?? event.message));
    addEventListener('unhandledrejection', (event) => kitFail(event.reason));
  }
  if (title) document.getElementById('pt-title').textContent = title;
  return document.getElementById('pages')
    ?? document.body.appendChild(Object.assign(document.createElement('main'), { id: 'pages' }));
}

function kitStatus(text) {
  viewer();
  document.getElementById('pt-status').textContent = text;
}

function kitFail(error) {
  document.documentElement.dataset.postext = 'error';
  kitStatus(`Error: ${error?.message ?? error}`);
}

// ─── Kit · pdf v1 ── the same in every recipe that exports a PDF ──────────────
/** postext-pdf embeds TrueType bytes. Fetch the Fontsource file the screen
 *  used, snapping to a weight the family ships and falling back to upright
 *  when it has no italic: the PDF asks for every face a block could use. */
async function fontsourceProvider(family, weight, style) {
  const id = fontsourceId(family);
  const meta = await fontsourceMeta(family);
  const weights = meta?.weights?.length ? meta.weights : [400, 700];
  const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
  const s = style === 'italic' && meta && !meta.styles.includes('italic') ? 'normal' : style;
  const res = await fetch(`https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-latin-${w}-${s}.woff2`);
  if (!res.ok) throw new Error(`Fontsource has no ${family} ${w} ${s} (${res.status})`);
  return decompressWoff2(new Uint8Array(await res.arrayBuffer()));
}

/** A "Build the PDF" button in the bar. Once built: "Open the PDF" (a new
 *  tab, since CodePen's preview frame cannot show PDFs) and a download link. */
function offerPdf(makePdf, filename) {
  viewer();
  const button = Object.assign(document.createElement('button'), { type: 'button', textContent: 'Build the PDF' });
  button.dataset.postextPdf = filename;
  button.addEventListener('click', async () => {
    button.disabled = true;
    button.textContent = 'Building the PDF…';
    try {
      const bytes = await makePdf();
      const url = URL.createObjectURL(new Blob([bytes], { type: 'application/pdf' }));
      const size = `${Math.max(1, Math.round(bytes.length / 1024))} KB`;
      button.replaceWith(
        Object.assign(document.createElement('a'), { href: url, target: '_blank', rel: 'noopener', textContent: 'Open the PDF ↗' }),
        Object.assign(document.createElement('a'), { href: url, download: filename, textContent: `Download ${filename} · ${size}` }));
    } catch (error) {
      button.disabled = false;
      button.textContent = 'Build the PDF';
      kitFail(error);
    }
  });
  document.getElementById('pt-actions').append(button);
}

// ─── Kit · cjk v1 ── Chinese, Japanese and Korean books · postext.dev/cookbook ─
// Fontsource ships a CJK family as about a hundred files per weight, each
// declared in its stylesheet with the unicode-range it covers. The screen
// loads the files the sample touches; the PDF gets the same files for the
// characters its pages set in each face, and embeds each as a subset.
// A book bound on the right (vertical text) is shown with its spreads
// mirrored: page 1 alone on the left of the spine, then [3 | 2].

/** The files of a Fontsource face, read from its stylesheet: { url, range,
 *  ranges }, the last declared first (the order the browser tries them in). */
function cjkSlices(family, weight, style) {
  cjkSlices.cache ??= new Map();
  const id = fontsourceId(family);
  const css = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/${weight}${style === 'italic' ? '-italic' : ''}.css`;
  if (!cjkSlices.cache.has(css)) {
    cjkSlices.cache.set(css, fetch(css)
      .then((res) => {
        if (!res.ok) throw new Error(`Fontsource has no ${family} ${weight} ${style} (${res.status})`);
        return res.text();
      })
      .then((text) => [...text.matchAll(/@font-face\s*{([^}]*)}/g)].map(([, rule]) => {
        const range = /unicode-range:\s*([^;]+);/.exec(rule)?.[1].trim() ?? 'U+0-10FFFF';
        const ranges = range.split(',').map((part) => {
          const [lo, hi = lo] = part.trim().slice(2).split('-');
          return [parseInt(lo, 16), parseInt(hi, 16)];
        });
        return { url: new URL(/url\(([^)]+?\.woff2)\)/.exec(rule)[1], css).href, range, ranges };
      }).reverse()));
  }
  return cjkSlices.cache.get(css);
}

/** The file of `slices` that holds code point `cp`, if any. */
function cjkSliceFor(slices, cp) {
  return slices.find((slice) => slice.ranges.some(([lo, hi]) => cp >= lo && cp <= hi));
}

/** Whether Fontsource serves `family` as a Chinese, Japanese or Korean
 *  family (its subsets name the script). Fails when the API does not
 *  answer: a CJK face taken for a Latin one would paint in a system face. */
async function isCjkFamily(family) {
  const meta = await fontsourceMeta(family);
  if (!meta) throw new Error(`api.fontsource.org did not describe ${family}: reload to try again`);
  return !!meta.subsets?.some((subset) => /^(chinese|japanese|korean)/.test(subset));
}

/** faces = { 'Noto Serif TC': ['400', '700'] }, as for loadFonts: the
 *  whole FONTS object may be passed, its other families are left to
 *  loadFonts. Adds one FontFace per file of each CJK face with its
 *  unicodeRange, then loads the files `text` touches. `text` is what the
 *  faces set: the sample for the text face; a book in several voices calls
 *  it once per voice (loadCjkFonts({ 'LXGW WenKai TC': ['400'] }, quotes)),
 *  so the heading and quotation faces fetch and check only their own
 *  characters. Fails when a character of `text` is in no file of a face.
 *  List every weight the pages use: a weight left to buildWithFonts gets
 *  the latin file only. With { vertical: true } it also loads each
 *  family's vertical forms (brackets, quotes, pause marks) for the canvas,
 *  which needs loadVerticalAlternates imported from postext. Resolves to
 *  the number of files loaded. */
async function loadCjkFonts(faces, text, { vertical = false } = {}) {
  kitStatus('Loading fonts…');
  let loaded = 0;
  try {
    if (vertical && typeof loadVerticalAlternates !== 'function') {
      throw new Error('loadCjkFonts(…, { vertical: true }) needs loadVerticalAlternates imported from postext');
    }
    for (const [family, specs] of Object.entries(faces)) {
      if (!(await isCjkFamily(family))) continue;
      const twin = [];
      for (const spec of new Set(specs)) {
        const weight = parseInt(spec, 10);
        const style = spec.endsWith('i') ? 'italic' : 'normal';
        const slices = await cjkSlices(family, weight, style);
        const missing = [...new Set(text)].filter((ch) => /\S/.test(ch) && !cjkSliceFor(slices, ch.codePointAt(0)));
        if (missing.length) {
          throw new Error(`${family} ${spec} has no file for ${missing.slice(0, 12).join(' ')}: `
            + `give each face the text it sets (loadCjkFonts({ '${family}': ['${spec}'] }, text))`);
        }
        for (const slice of slices) {
          document.fonts.add(new FontFace(family, `url(${slice.url}) format('woff2')`,
            { weight: String(weight), style, unicodeRange: slice.range }));
          twin.push({ source: slice.url, weight: String(weight), style, unicodeRange: slice.range });
        }
        const font = `${style === 'italic' ? 'italic ' : ''}${weight} 16px "${family}"`;
        loaded += (await document.fonts.load(font, text)).length;
        if (!document.fonts.check(font, text)) throw new Error(`${family} ${spec} did not load for the sample`);
      }
      // The same files under a twin name with the `vert` feature on: the
      // canvas paints the punctuation of vertical lines with it.
      if (vertical && twin.length) await loadVerticalAlternates(family, twin);
    }
  } catch (error) {
    kitFail(error);
    throw error;
  }
  return loaded;
}

/** The PDF font provider for recipes with CJK faces: a family whose
 *  Fontsource subsets are Chinese, Japanese or Korean gets the files that
 *  hold the characters its pages set (`request.codePoints`); any other
 *  family goes to fontsourceProvider (the "pdf" block). */
async function cjkPdfProvider(family, weight, style, request) {
  if (!(await isCjkFamily(family))) return fontsourceProvider(family, weight, style);
  const meta = await fontsourceMeta(family);
  const weights = meta.weights?.length ? meta.weights : [400, 700];
  const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
  const s = style === 'italic' && !meta.styles.includes('italic') ? 'normal' : style;
  const slices = await cjkSlices(family, w, s);
  const picked = new Set();
  for (const cp of request?.codePoints ?? []) {
    const slice = cjkSliceFor(slices, cp);
    if (slice) picked.add(slice);
  }
  if (!picked.size) picked.add(slices[0]);
  return Promise.all(slices.filter((slice) => picked.has(slice)).map(async (slice) => {
    const res = await fetch(slice.url);
    if (!res.ok) throw new Error(`Fontsource file ${slice.url} (${res.status})`);
    return decompressWoff2(new Uint8Array(await res.arrayBuffer()));
  }));
}

/** showPages for a book bound on either edge. A right-bound book (the
 *  document says so: doc.binding is 'right' for page.binding 'right' and
 *  for vertical text) lies on the desk as it opens: page 1 alone on the
 *  left of the spine, then [3 | 2], the spine shade on each page's inner
 *  edge. `binding` ('left' | 'right') overrides the document's. */
function showBook(docs, { binding, ...options } = {}) {
  const count = showPages(docs, options);
  const right = (binding ?? [docs].flat()[0]?.binding) === 'right';
  if (!document.getElementById('pt-kit-cjk')) {
    // The pages keep direction ltr: a canvas draws text in the direction its
    // element inherits, and under rtl each run would end where the engine
    // starts it, its brackets mirrored.
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit-cjk">
      .pt-spread[dir="rtl"] canvas { direction: ltr; }
      .pt-spread[dir="rtl"] figure:first-child canvas { box-shadow: inset 14px 0 14px -14px rgb(0 0 0 / .18),
        0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
    </style>`);
  }
  // Each pair stays [verso, recto] in the page; right to left, the verso
  // sits on the right. Phones stack the pages in reading order either way.
  for (const spread of document.querySelectorAll('#pages > .pt-spread')) spread.dir = right ? 'rtl' : 'ltr';
  document.getElementById('pages').dataset.binding = right ? 'right' : 'left';
  return count;
}

// ─── /Kit ───────────────────────────────────────────────────────────────────────