Une page de dictionnaire chinois avec mots-repères

// ═══ Postext Cookbook · Nº 086 · A Chinese dictionary page with guide words ═════════
// https://postext.dev/en/cookbook/chinese-dictionary-page
// Code: MIT · Text: 康熙字典 (1716), Wikisource transcription, CC BY-SA 4.0 · Pinyin: CC BY 4.0
// Fonts: Noto Serif TC, Noto Sans TC, LXGW WenKai TC (SIL OFL 1.1) · Needs postext ≥ 1.25.0
import { buildDocument, withLoadedFonts, renderPageToCanvas } from 'https://esm.sh/postext';
import { renderToPdf, decompressWoff2 } from 'https://esm.sh/postext-pdf';

const LANG = 'en'; // @lang: the language of the sample document ('en' | 'es')
const RECIPE = 'chinese-dictionary-page';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
// #region palette: black and one cinnabar, the second ink of a two-colour dictionary
const palette = {
  ink: '#1f1b17', // text, guide words
  cinnabar: '#a52f28', // headwords, their readings, sense numbers, the thumb tab
  rule: '#bab2a4', // the column rule
  muted: '#5c554d', // folios, colophon
  paper: '#fbf8f2', // the page, and the letter reversed out of the tab
};
const col = (id) => ({ hex: palette[id], model: 'hex', paletteId: id });
// The engine's defaults link to 'main-color': point it at the cinnabar.
const colorPalette = Object.entries({ ...palette, 'main-color': palette.cinnabar })
  .map(([id, hex]) => ({ id, name: id, value: { hex, model: 'hex' } }));
// #endregion
const [SONG, HEI, KAI] = ['Noto Serif TC', 'Noto Sans TC', 'LXGW WenKai TC'];
const PT = 25.4 / 72; // mm in a point
const [BODY, LEAD] = [9, 15]; // pt: 小五 on a 15 pt line, the grid both columns share
const [CHARS, LINES] = [17, 31]; // characters to a column's line, lines to a column
const TRIM = { width: 140, height: 203 }; // mm: 大32开
const MIN = { top: 20, bottom: 16, side: 12 }; // mm: minimums the grid grows to centre the area
// The type area the grid sets (two columns and a 2-em gutter) and the margins it leaves.
const AREA = { width: (2 * CHARS + 2) * BODY * PT, height: LINES * LEAD * PT }; // 114.3 × 164
const SIDE = (TRIM.width - AREA.width) / 2; // 12.85 mm
const TOP = MIN.top + (TRIM.height - MIN.top - MIN.bottom - AREA.height) / 2; // 21.5 mm

// #region answer: the first and the last headword of each page in its running head
// Each headword is a level-2 heading, '## {天|tiān}'. {firstMark.h2} prints the text of the
// first one that starts on the page, without its reading, and {lastMark.h2} the last; a
// page on which none starts repeats the one in force. They stand at the outer corner, the
// folio outside them, over a hairline as wide as the type area.
const HEAD_Y = 11; // mm from the top edge to the top of the guide words
const [GUIDE, FOLIO] = [10.5, 8]; // pt
const head = (id, content, parity, x, size, extra) => ({ kind: 'text', id, content, parity,
  fontFamily: HEI, fontWeight: 700, fontSize: pt(size), lineHeight: 1, color: col('ink'),
  // A design line puts its baseline 0.8 of its height down: the folio drops to share it.
  placement: { anchor: { to: 'page', edge: parity === 'even' ? 'top-left' : 'top-right' },
    offset: { x: mm(parity === 'even' ? x : -x), y: mm(HEAD_Y + 0.8 * (GUIDE - size) * PT) } },
  ...extra });
const folio = { color: col('muted') };
const guideWords = [
  head('verso-folio', '{pageNumber}', 'even', SIDE, FOLIO, folio),
  head('verso-guide', '{firstMark.h2}—{lastMark.h2}', 'even', SIDE + 8, GUIDE),
  head('recto-guide', '{firstMark.h2}—{lastMark.h2}', 'odd', SIDE + 8, GUIDE),
  head('recto-folio', '{pageNumber}', 'odd', SIDE, FOLIO, folio),
  { kind: 'rule', id: 'hairline', direction: 'horizontal', thickness: pt(0.5), color: col('ink'),
    placement: { anchor: { to: 'page', edge: 'top-left' },
      offset: { x: mm(SIDE), y: mm(HEAD_Y + 5.5) }, size: { width: mm(AREA.width) } } },
];
// #endregion

// #region tab: the initial T on the fore-edge, 19th of the 23 that start a pinyin syllable
const INITIALS = 'ABCDEFGHJKLMNOPQRSTWXYZ'; // no pinyin syllable starts with I, U or V
const STEP = AREA.height / INITIALS.length; // mm: 7.13, the 23 tabs fill the type area's height
const tab = (parity) => {
  const edge = parity === 'odd' ? 'top-right' : 'top-left'; // the fore-edge
  const at = (x, width) => ({ anchor: { to: 'page', edge },
    offset: { x: mm(parity === 'odd' ? x : -x), y: mm(TOP + INITIALS.indexOf('T') * STEP + 0.3) },
    size: { width: mm(width), height: mm(STEP - 0.6) } });
  // 6 mm inside the trim and 3 mm past it: the page cuts the tab square at the fore-edge
  // (a print file with cutLines prints the 3 mm in its bleed); the letter on the 6 mm.
  return [
    { kind: 'box', id: `tab-${parity}`, parity, placement: at(3, 9),
      style: { backgroundColor: col('cinnabar'), borderRadius: mm(1.2) } },
    { kind: 'text', id: `tab-letter-${parity}`, parity, content: 'T', fontFamily: HEI,
      fontWeight: 700, fontSize: pt(9), lineHeight: 1, color: col('paper'), align: 'center',
      verticalAlign: 'middle', placement: at(0, 6) },
  ];
};
// #endregion

// #region headwords: 15 pt Song Black in cinnabar, the pinyin over it in the line gap
// A heading with no design of its own keeps its reading: '## {天|tiān}' sets tiān over 天.
// Two grid lines hold the headword and a 7.5 pt reading, so every entry stays on the grid.
// A Latin reading stands clear of its base by its descenders: the g of tīng stays off 汀.
const cjk = {
  grid: { enabled: true, charsPerLine: CHARS, linesPerPage: LINES },
  // The regular Song, not the heading's Black: a reading takes the face of its base.
  ruby: { fontFamily: SONG, fontSize: em(0.5), color: col('cinnabar') },
};
const headword = { level: 2, fontSize: pt(15), lineHeight: pt(2 * LEAD), marginTop: pt(0),
  marginBottom: pt(0) };
// #endregion

// #region senses: one paragraph to an entry, the sense numbers ① ② in cinnabar
// As the Kangxi Dictionary sets an entry: the rhyme-book readings (反切), then the senses
// run in, each after its number. '**②**' marks a number, and the text prints its bold in
// cinnabar: the only bold on these pages. A circled number is a Chinese character to the
// composer: no line ends on one, away from the sense it opens, and no space follows it.
const bodyText = { fontFamily: SONG, fontSize: pt(BODY), lineHeight: pt(LEAD), color: col('ink'),
  boldColor: col('cinnabar'), italicColor: col('ink'), referenceColor: col('ink'),
  textAlign: 'justify', firstLineIndent: pt(0) }; // no indent: the headword opens the entry
// #endregion
// The colophon: a sentence of Chinese in the Kai, then the credits in the Song's Latin letters.
const colophon = { fontSize: pt(7.5), lineHeight: pt(11), color: col('muted'),
  firstLineIndent: pt(0), textAlign: 'left' };
const paragraphStyles = [
  { id: 'colophon-zh', ...colophon, fontFamily: KAI, marginTop: pt(LEAD) },
  { id: 'colophon', ...colophon, fontFamily: SONG, marginTop: pt(3) },
];

const config = () => ({
  // Taiwan's rules: full-width punctuation, centred in Noto Serif TC, and the basic
  // line breaking. Written out, never LANG (gotcha: cjk-locale-tag).
  locale: 'zh-Hant',
  colorPalette,
  page: { width: mm(TRIM.width), height: mm(TRIM.height), dpi: 150,
    backgroundColor: col('paper'),
    margins: { top: mm(MIN.top), bottom: mm(MIN.bottom), left: mm(MIN.side),
      right: mm(MIN.side), mirror: true } },
  layout: { layoutType: 'double', gutterWidth: pt(2 * BODY),
    columnRule: { enabled: true, color: col('rule'), lineWidth: pt(0.4) } },
  cjk,
  bodyText,
  headings: { fontFamily: SONG, fontWeight: 900, color: col('cinnabar'), textAlign: 'left',
    // Every entry follows the one before with no line between them. Column balancing would
    // open lines above some headwords to bring a short column down to the foot; off, a column
    // that cannot take the next headword and two lines of its text ends short instead.
    balancing: { enabled: false },
    levels: [
      // No letter opens in these pages; one that did would start the next page, on either side.
      { level: 1, breakBefore: { enabled: true, parity: 'any' } },
      headword,
    ] },
  paragraphStyles,
  header: { elements: [...guideWords, ...tab('even'), ...tab('odd')] },
  footer: { elements: [] },
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
Exemple Markdown · 132 lignes · content.en.md
title: "康熙字典選讀"
---

## {天|tiān}

《唐韻》《正韻》他前切，《集韻》《韻會》他年切。**①**《說文》顛也。至高在上，从一大也。《易·說卦》乾為天。**②**星名。《爾雅·釋天》天根，氐也。**③**地名。《蜀地志》蜀邛僰山後四野，無晴日，曰漏天。《杜甫詩》地近漏天終歲雨。**④**姓。漢長社令天高，見《姓苑》。

## {添|tiān}

《唐韻》《集韻》《韻會》《正韻》並他兼切，音沾。**①**《玉篇》益也。**②**《集韻》他念切，味益也。**③**《李翊俗名小錄》呼下酒具為添。

## {田|tián}

《唐韻》待年切，《集韻》《韻會》《正韻》亭年切，並音闐。**①**《說文》陳也。樹穀曰田，象四口。十，阡陌之制也。《正韻》土已耕曰田。《易·乾卦》見龍在田。**②**獵也，與畋、佃通。《易·恆卦》田无禽。《詩·鄭風》叔于田。**③**姓。《五音集韻》出北平，敬仲自陳適齊，後改田氏。《史記·田敬仲完世家註》敬仲奔齊，以陳田二字聲相近，遂為田氏。**④**鼓名。《詩·周頌》應田縣鼓。《傳》田，大鼓也。**⑤**蓮葉貌。《江南曲》江南可採蓮，蓮葉何田田。

## {恬|tián}

《唐韻》《集韻》《韻會》《正韻》並徒兼切，音甜。**①**《說文》安也。从心，甜省聲。《書·梓材》引養引恬。**②**靜也。《莊子·繕性篇》以恬養志。

## {填|tián}

《廣韻》徒年切，《集韻》《韻會》《正韻》亭年切，並音田。**①**《說文》塞也。《博物志》炎帝女溺死東海中，化為鳥，曰精衛，常取西山之木石，以填東海。**②**鼓聲。《孟子》填然鼓之。

## {闐|tián}

《唐韻》待年切，《集韻》《韻會》《正韻》亭年切，並音田。**①**《說文》盛也。**②**《博雅》闐闐，聲也。《詩·小雅》振旅闐闐。《左思·蜀都賦》車馬雷駭，轟轟闐闐。**③**《增韻》滿也。《史記·汲鄭傳》始翟公為廷尉，賓客闐門。

## {忝|tiǎn}

《唐韻》《集韻》《韻會》《正韻》並他點切。**①**《說文》辱也。《詩·小雅》無忝爾所生。

## {殄|tiǎn}

《唐韻》《集韻》《韻會》《正韻》並徒典切，填上聲。**①**《說文》盡也。一曰絕也。《書·畢命》商俗靡靡，餘風未殄。**②**與腆同。《儀禮·燕禮》寡君有不腆之酒。《鄭註》古文腆皆作殄。

## {腆|tiǎn}

《唐韻》《集韻》《韻會》《正韻》並他典切。**①**《說文》設膳腆腆多也。《玉篇》厚也。《書·酒誥》自洗腆致用酒。《註》洗以致其潔，腆以致其厚。**②**《廣韻》善也。《禮·郊特牲》幣必誠，辭無不腆。

## {佻|tiāo}

《廣韻》徒聊切，《集韻》《韻會》《正韻》田聊切，並音條。**①**《爾雅·釋言》佻，偷也。《屈原·離騷》余猶惡其佻巧。**②**行不耐勞苦貌。《詩·小雅》佻佻公子，行彼周行。**③**竊取名。《周語》佻天以為己力。

## {挑|tiāo}

《唐韻》吐彫切，《集韻》《韻會》《正韻》他彫切，並音祧。**①**《說文》撓也。**②**《增韻》杖荷也。俗謂肩荷曰挑。**③**取也。今揀選人物亦謂之挑。

## {迢|tiáo}

《唐韻》徒聊切，《集韻》《韻會》《正韻》田聊切，並音條。**①**《說文》迢遰也。《正字通》遠不相通也。**②**《集韻》迢迢，高貌。

## {條|tiáo}

《廣韻》徒聊切，《集韻》《韻會》田聊切，並音迢。**①**《說文》小枝也。《詩·周南》伐其條枚。《傳》枝曰條，榦曰枚。**②**條理也。《書·盤庚》若網在綱，有條而不紊。**③**條例。顏師古曰：凡言條者，一一而疏舉之，若木條焉。**④**八風之一。《易緯通卦驗》東北曰條風。

## {蜩|tiáo}

《唐韻》徒聊切，《集韻》《韻會》《正韻》田聊切，並音迢。**①**《玉篇》蟬也。《詩·豳風》五月鳴蜩。《傳》蜩，蟬也。螗，蝘也。**②**蜩甲，蟬蛻也。《莊子·寓言篇》予蜩甲也。

## {調|tiáo}

《唐韻》徒遼切，《集韻》《韻會》《正韻》田聊切，並音迢。**①**《說文》和也。《詩·小雅》弓矢既調。《禮·月令》仲夏調竽笙竾簧。**②**《韻會》揉伏也。《史記·秦本紀》大費佐舜調馴鳥獸。**③**《正字通》嘲笑也。《世說》王丞相每調之。

## {髫|tiáo}

《唐韻》徒聊切，《集韻》《韻會》《正韻》田聊切，並音迢。**①**《說文》小兒垂結也。《後漢·伏湛傳》髫髮厲志。《註》髫髮謂童子垂髮也。《干祿字書》俗作齠。

## {挑|tiǎo}

《唐韻》《集韻》《韻會》並徒了切，音窕。**①**引也，撥也。《史記·項羽紀》願與漢王挑戰，決雌雄。《前漢·司馬相如傳》相如以琴心挑之。《註》寄心於琴聲，以挑動之也。**②**亦與誂通。誘也，戲也。

## {窕|tiǎo}

《唐韻》《韻會》《正韻》並徒了切，掉上聲。**①**深極也，閒也。《詩·周南》窈窕淑女。《傳》窈窕，幽閒也。**②**山水深亦曰窈窕。《杜甫詩》煙生窈窕溪。**③**細也。《左傳·昭二十一年》小者不窕。

## {眺|tiào}

《唐韻》《集韻》《韻會》《正韻》並他弔切，音糶。**①**《說文》目不正也。《潘岳·射雉賦》邪眺旁剔。《註》視瞻不正，常驚惕也。**②**《玉篇》眺望也。《類篇》遠視也。《禮·月令》可以遠眺望。

## {跳|tiào}

《廣韻》徒聊切，《集韻》《韻會》《正韻》田聊切，並音迢。**①**《說文》蹶也。一曰躍也。《莊子·逍遙遊》東西跳梁。《史記·司馬相如傳》馳波跳沫。**②**《集韻》徒刀切，音陶。與逃通。《前漢·高帝紀》漢王跳。《註》謂走也。

## {糶|tiào}

《廣韻》《集韻》《韻會》《正韻》並他弔切，音眺。**①**《說文》出穀也。《史記·貨殖傳》糶二十病農，九十病末。**②**《集韻》徒弔切，音調。姓也。晉有糶裁。

## {帖|tiē}

《唐韻》他叶切，《集韻》《韻會》託協切，《正韻》他協切，並音貼。**①**《廣雅》服也。**②**《增韻》妥帖，定也。《王逸·楚辭序》義多乖異，事不妥帖。《陸機·文賦》或妥帖而易施。

## {貼|tiē}

《廣韻》《正韻》他協切，《集韻》《韻會》托協切，並音帖。**①**《說文》以物為質也。**②**《增韻》裨也，依附也，黏置也。

## {鐵|tiě}

〔古文〕銕《唐韻》天結切，《集韻》《韻會》《正韻》他結切，並天入聲。**①**《說文》黑金也。《書·禹貢》厥貢璆鐵銀鏤砮磬。《史記·貨殖傳》邯鄲郭縱以冶鐵成業。**②**《禮·月令》孟冬駕鐵驪。《註》鐵驪，色如鐵。**③**姓。《正字通》宋鐵南仲，明鐵鉉。

## {餮|tiè}

《廣韻》《集韻》《韻會》《正韻》並他結切，音鐵。**①**《玉篇》貪食也。《左傳·文十八年》縉雲氏有不才子，貪於飲食，冒於貨賄，天下謂之饕餮。《註》貪財為饕，貪食為餮。

## {汀|tīng}

《唐韻》他丁切，《集韻》《韻會》湯丁切，《正韻》他經切。**①**《說文》平也。謂水際平地。《謝靈運詩》汀曲舟已隱。**②**洲渚。《楚辭·九歌》搴汀洲兮杜若。

## {聽|tīng}

《廣韻》《集韻》《韻會》《正韻》並他定切，音侹。**①**《說文》聆也。《書·太甲》聽德惟聰。**②**《廣韻》待也。**③**從也。《左傳·昭二十六年》姑慈婦聽。**④**斷也。《禮·王制》司寇正刑明辟，以聽獄訟。

## {廳|tīng}

《廣韻》他丁切，《集韻》湯丁切，《正韻》他經切，並音汀。**①**《廣韻》屋也。**②**《集韻》古者治官處，謂之聽事。《增韻》漢晉皆作聽，六朝以來，乃始加广。

## {亭|tíng}

《唐韻》特丁切，《集韻》《韻會》《正韻》唐丁切，並音庭。**①**《說文》民所安定也。《釋名》停也。道路所舍，人停集也。**②**亭長。《後漢·百官志》十里一亭，十亭一鄉。**③**平也，均也。《前漢·酷吏傳》張湯平亭疑法。**④**亭亭，聳立貌。《黃庭經》九原之山何亭亭。

## {庭|tíng}

《唐韻》特丁切，《集韻》《韻會》《正韻》唐丁切，並音亭。**①**《說文》宮中也。《玉篇》堂階前也。《易·節卦》不出戶庭，无咎。**②**《爾雅·釋詁》直也。《詩·小雅》播厥百穀，既庭且碩。**③**洞庭，湖名。《楚辭·九歌》洞庭波兮木葉下。

:::space{lines=4}

:::paragraphs{style="colophon-zh"}
據維基文庫本《康熙字典》選錄三十條，依漢語拼音排序，拼音與義項編號為編者所加。
:::

:::paragraphs{style="colophon"}
Entries from the Kangxi Dictionary (1716) in the Wikisource transcription (CC BY-SA 4.0); pinyin readings and sense numbers added by the editors. Set in Noto Serif TC, Noto Sans TC and LXGW WenKai TC (SIL OFL).
:::
`; // content.<lang>.md, inlined by the Cookbook

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = { // every face the pages use, loaded before the build
  'Noto Serif TC': ['400', '700', '900'], // SONG: the entries, readings, credits; the headwords
  'Noto Sans TC': ['700'], // HEI: guide words, folios, the tab
  'LXGW WenKai TC': ['400'], // KAI: the colophon's sentence of Chinese
};

// ─── 4 · Build & show ───────────────────────────────────────────────────────
// #region voices: each face loads the files of the characters it sets
// Fontsource cuts a Chinese face into about a hundred files (gotcha: cjk-fonts-slices).
// The regular Song sets the whole sample; each other voice gets only its own text.
const all = (re) => [...markdown.matchAll(re)].map((m) => m[1]).join('');
const heads = all(/^## \{(.+?)\|/gm);
await loadFonts(FONTS, markdown);
await loadCjkFonts({ [SONG]: ['400'] }, markdown);
await loadCjkFonts({ [SONG]: ['700'] }, all(/\*\*(.+?)\*\*/g));
await loadCjkFonts({ [SONG]: ['900'] }, heads);
await loadCjkFonts({ [HEI]: ['700'] }, `${heads}—0123456789T`);
await loadCjkFonts({ [KAI]: ['400'] }, all(/style="colophon-zh"\}\n(.+)\n/g));
// #endregion
// Pages 634 to 637 of the dictionary: page 1 is a verso, so the four lie as two spreads.
const continuation = { pageIndexOffset: 633, pageNumbering: { startAt: 634 } };
const doc = await withLoadedFonts(
  () => buildDocument({ markdown, continuation }, config()),
  { ...kitFonts(FONTS), text: markdown });
showPages(doc, { title: t({ en: 'A Chinese dictionary page',
  es: 'Una página de diccionario chino' }) });
offerPdf(() => renderToPdf(doc, { fontProvider: cjkPdfProvider }), `${RECIPE}.pdf`);

Kit · core, fonts, viewer, pdf, cjk : identique dans toutes les recettes · 458 lignes
// ─── 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]; }
/** A file in this recipe's assets folder, served from the Postext repo by jsDelivr. */
function asset(file) { return `https://cdn.jsdelivr.net/gh/drnachio/postext@main/cookbook/${RECIPE}/assets/${file}`; }

// ─── Kit · fonts v3 ── the same in every recipe · postext.dev/cookbook
// Postext loads the faces a config asks for before layout (prepareFonts,
// buildDocumentWithFonts) and asks the kit for the files: Fontsource's, the
// files the PDF embeds too.

/** The options of buildDocumentWithFonts / prepareFonts / withLoadedFonts:
 *  the Fontsource resolver, and the faces of FONTS loaded with the ones the
 *  config names. FONTS = { 'Family Name': ['400', '400i', '700'] }. */
function kitFonts(FONTS = {}) {
  const faces = Object.entries(FONTS).flatMap(([family, specs]) => specs.map((spec) =>
    ({ family, weight: parseInt(spec, 10), style: spec.endsWith('i') ? 'italic' : 'normal' })));
  return { resolve: fontsourceResolver, faces };
}

/** A face's Fontsource files, in a fixed order: latin, then latin-ext and greek
 *  when `text` needs them and the family ships them (kitSubsetsFor), each with
 *  its unicode-range. Null for a weight or slant Fontsource does not ship. */
async function fontsourceResolver(family, weight, style, { text = '' } = {}) {
  const id = fontsourceId(family);
  const meta = await fontsourceMeta(family);
  if (meta && !(meta.weights.includes(weight) && meta.styles.includes(style))) return null;
  kitStatus('Loading fonts…');
  const at = await fontsourceAt(id);
  return ['latin', ...kitSubsetsFor(text, meta)].map((subset) => ({
    source: `${at}files/${id}-${subset}-${weight}-${style}.woff2`,
    unicodeRange: kitRanges()[subset],
  }));
}

/** The unicode-range of each Fontsource file the kit loads (a function: the
 *  kit is inlined after the pen's code, which runs before a const would be set). */
function kitRanges() {
  return {
    latin: 'U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,'
      + 'U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD',
    'latin-ext': 'U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,'
      + 'U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF',
    greek: 'U+0370-03FF',
  };
}

/** For the cjk, arabic and comics blocks, which add their own files: the
 *  faces of `faces` = { 'Family Name': ['400', '400i', '700'] }. `text` is the sample:
 *  č ł † α χ also load latin-ext and greek files (kitSubsetsFor). With
 *  `optional`, a face Fontsource does not ship is skipped instead of failing.
 *  The files are added once all have loaded, in the order asked (latin, then
 *  latin-ext, then greek), whatever order they arrive in: the last one added
 *  wins a character two files hold. Resolves to the number of faces added. */
async function loadFonts(faces, text = '', { optional = false } = {}) {
  kitStatus('Loading fonts…');
  const ranges = kitRanges();
  const jobs = [];
  for (const [family, specs] of Object.entries(faces)) {
    const id = fontsourceId(family);
    const todo = [...new Set(specs)].map((spec) => [parseInt(spec, 10), spec.endsWith('i') ? 'italic' : 'normal'])
      .filter(([weight, style]) => !hasFace(family, weight, style)); // before any await
    const at = fontsourceAt(id);
    const meta = optional || /[^\0-ÿ]/u.test(text) ? await fontsourceMeta(family) : null;
    const subsets = ['latin', ...kitSubsetsFor(text, meta)];
    for (const [weight, style] of todo) {
      if (optional && !(meta?.weights.includes(weight) && meta.styles.includes(style))) continue;
      for (const subset of subsets) {
        const url = `${await at}files/${id}-${subset}-${weight}-${style}.woff2`;
        const face = new FontFace(family, `url(${url}) format('woff2')`,
          { weight: String(weight), style, unicodeRange: ranges[subset] });
        jobs.push(face.load().catch(() => {
          if (subset === 'latin' && !optional) throw new Error(`Fontsource has no ${family} ${weight} ${style}`);
        }));
      }
    }
  }
  const ready = await Promise.all(jobs).catch((error) => { kitFail(error); throw error; });
  return ready.filter((face) => face && document.fonts.add(face)).length;
}

/** A loaded FontFace covers this family, weight and style (fonts.check() would
 *  also say yes 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;
}

/** The files beyond latin `text` needs that `meta`'s family ships. */
function kitSubsetsFor(text, meta) {
  return [[/[Ā-˿ᴀ-ᶿḀ-ỿ†ℓⱠ-Ɀ꜠-ꟿ]/u, 'latin-ext'], [/[Ͱ-Ͽ]/u, 'greek']]
    .filter(([re, x]) => re.test(text) && meta?.subsets?.includes(x)).map(([, x]) => x);
}

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

/** A package's folder at the one version @5 names now (#766). */
function fontsourceAt(id, u = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@`) {
  return (fontsourceAt.c ??= {})[id] ??= fetch(u + '5/package.json').then((r) => r.json())
    .then((p) => p.version || 5, () => 5).then((v) => `${u}${v}/`);
}

/** The family's Fontsource metadata (weights, styles, subsets), 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 v2 ── the same in every recipe · postext.dev/cookbook
/** The pages as spreads on a dark desk, page 1 alone, then verso | recto,
 *  each painted when it scrolls near. Other options go to renderPageToCanvas. */
function showPages(docs, { title, width = 460, ...render } = {}) {
  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, { ...render, 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 v3 ── the same in every recipe that exports a PDF
/** The Fontsource files the screen used, as TrueType, with their range and
 *  place: the nearest weight the family ships, upright with no italic;
 *  latin, then what its letters need (kitSubsetsFor). */
async function fontsourceProvider(family, weight, style, request) {
  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 text = String.fromCodePoint(...(request?.codePoints ?? []));
  const files = await Promise.all(['latin', ...kitSubsetsFor(text, meta)].map(async (subset, order) => {
    const res = await fetch(`${await fontsourceAt(id)}files/${id}-${subset}-${w}-${s}.woff2`);
    if (!res.ok) throw new Error(`Fontsource has no ${family} ${w} ${s} ${subset}`);
    return Object.assign(await decompressWoff2(new Uint8Array(await res.arrayBuffer())),
      { unicodeRange: kitRanges()[subset], order });
  }));
  return files.length === 1 ? files[0] : files;
}

/** A "Build the PDF" button; then "Open the PDF" (a new tab: CodePen's frame
 *  shows no 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 v2 ── 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 = `${id}/${weight}${style === 'italic' ? '-italic' : ''}.css`;
  if (!cjkSlices.cache.has(css)) {
    let at;
    cjkSlices.cache.set(css, fontsourceAt(id).then((a) => fetch(at = a + css.slice(id.length + 1)))
      .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], at).href, range, ranges };
      }).reverse()));
  }
  return cjkSlices.cache.get(css);
}

/** The file of `slices` the screen sets code point `cp` in, if any: the
 *  last one loadCjkFonts adds whose range holds it. A numbered file that
 *  repeats a letter of latin is added after latin, and wins it. */
function cjkSliceFor(slices, cp) {
  const holds = (slice) => slice.ranges.some(([lo, hi]) => cp >= lo && cp <= hi);
  return slices.reduce((last, slice) => (holds(slice) ? slice : last), undefined);
}

/** 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 the engine's later round
 *  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 the
 *  screen set its pages' characters in (`request.codePoints`), each marked
 *  with its unicode-range and its place in the order loadCjkFonts added
 *  them: postext-pdf sets a character two files hold in the one added
 *  last, as the browser does. Any other family gets the latin file
 *  fontsourceProvider fetches (the "pdf" block) and, when the face sets
 *  letters only latin-ext has, that file too. */
async function cjkPdfProvider(family, weight, style, request) {
  if (!(await isCjkFamily(family))) return cjkLatinPdfFiles(family, weight, style, request);
  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.map(async (slice, order) => {
    if (!picked.has(slice)) return null;
    const res = await fetch(slice.url);
    if (!res.ok) throw new Error(`Fontsource file ${slice.url} (${res.status})`);
    const bytes = await decompressWoff2(new Uint8Array(await res.arrayBuffer()));
    return Object.assign(bytes, { unicodeRange: slice.range, order });
  })).then((files) => files.filter(Boolean));
}

/** A Latin family set next to the CJK faces: its latin file, then its
 *  latin-ext file when the face sets letters only latin-ext has (ō ū in
 *  Hepburn rōmaji, ǎ in pinyin), the file loadFonts adds on screen for
 *  them, each marked with its unicode-range and its place in that order:
 *  the PDF sets a character in the file the browser took it from. A face
 *  Fontsource ships without latin-ext, or whose file does not come, gets
 *  latin alone, and the PDF names the letters it lacks. */
async function cjkLatinPdfFiles(family, weight, style, request) {
  const meta = await fontsourceMeta(family);
  const beyond = [...(request?.codePoints ?? [])].some(cjkLatinExtOnly);
  if (!beyond || !meta?.subsets?.includes('latin-ext')) return fontsourceProvider(family, weight, style);
  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 id = fontsourceId(family);
  const url = `${await fontsourceAt(id)}files/${id}-latin-ext-${w}-${s}.woff2`;
  const [latin, ext] = await Promise.all([fontsourceProvider(family, weight, style), fetch(url)
    .then(async (res) => (res.ok ? decompressWoff2(new Uint8Array(await res.arrayBuffer())) : null), () => null)]);
  const ranges = kitRanges();
  return ext ? [Object.assign(latin, { unicodeRange: ranges.latin, order: 0 }),
    Object.assign(ext, { unicodeRange: ranges['latin-ext'], order: 1 })] : latin;
}

/** Whether code point `cp` is in Fontsource's latin-ext file and not in
 *  its latin file: Latin Extended-A and -B, IPA, the spacing modifiers and
 *  Latin Extended Additional (loadFonts's test for latin-ext), less the
 *  few latin holds too (ı Œ œ ʻ ʼ ˆ ˚ ˜). */
function cjkLatinExtOnly(cp) {
  if (!((cp >= 0x100 && cp <= 0x2ff) || (cp >= 0x1e00 && cp <= 0x1eff))) return false;
  return ![0x131, 0x152, 0x153, 0x2bb, 0x2bc, 0x2c6, 0x2da, 0x2dc].includes(cp);
}

/** 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;
}

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