28 × 28字格上的中文小说页

// ═══ Postext Cookbook · Nº 074 · A Chinese novel page on a 28 × 28 grid ════════════
// https://postext.dev/en/cookbook/chinese-novel-horizontal
// Code: MIT · Text: Lu Xun, 故乡 (1921), public domain, zh.wikisource · Plate: drawn in code
// Fonts: Noto Serif SC, Noto Sans SC, Ma Shan Zheng (SIL OFL 1.1) · Needs postext ≥ 1.9.0
import {
  buildDocument, renderPageToCanvas, clearMeasurementCache, registerResourceImage,
} 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-novel-horizontal';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
// The night of the story's memory, and ink on a cream paper.
const palette = {
  ink: '#1f1c19', // text: a warm near-black
  night: '#1d3150', // the accent: the deep blue sky of the plate, the opener's rule
  moon: '#dcaa45', // the golden moon, on the plate only
  melon: '#3c6a3b', // the green melons
  sand: '#e4d5b0', // the sand by the sea
  rule: '#c9c1b2', // the hairline under the running heads
  muted: '#6a645b', // running heads, folios, the colophon
  paper: '#fbf8f1', // a cream book 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: 'night (defaults)', value: { hex: palette.night, model: 'hex' } },
];
const SONG = 'Noto Serif SC'; // 宋: the text, and the title in its black weight
const HEI = 'Noto Sans SC'; // 黑: running heads, folios, the author, the colophon
const KAI = 'Ma Shan Zheng'; // 楷: a brush regular script for the plate's quotation
const [BODY, LEAD] = [10.5, 16.5]; // pt: 五号 on a 6 pt line gap, the grid's pitch
const [CHARS, LINES] = [28, 28];
const TRIM = { width: 140, height: 203 }; // mm: 大32开
const MEASURE = (CHARS * BODY * 25.4) / 72; // 103.7 mm: 28 ems of 五号
const SIDE = (TRIM.width - MEASURE) / 2; // 18.1 mm: the grid centres the measure

// #region answer: 28 characters × 28 lines of 五号, mainland line breaks and Kaiming marks
const cjk = {
  // The type area in characters: 28 ems wide, 28 lines of LEAD tall. page.margins become
  // minimums, and the grid centres the type area in the room they leave.
  grid: { enabled: true, charsPerLine: CHARS, linesPerPage: LINES },
  // What 'zh-Hans' gives by itself, written out so a reader can compare regions and styles.
  region: 'mainland',
  lineBreak: 'gb', // no 。，、”》 opens a line, no “《（ ends one, and no / at either end
  punctuationWidth: 'kaiming', // ，、：； quotes, brackets ½ em; 。？！ one em, ½ at a line end
  compressAdjacent: true, // idle under Kaiming (no pair tops 1.5 em); 'fullwidth' needs it
  latinSpacing: em(0.25), // 1921年, 用Noto Serif SC五号: a quarter em, none of it typed
};
const bodyText = {
  fontFamily: SONG, fontSize: pt(BODY), lineHeight: pt(LEAD), color: col('ink'),
  boldColor: col('ink'), italicColor: col('ink'), referenceColor: col('ink'),
  textAlign: 'justify', // spread between the characters, never between words
  firstLineIndent: em(2), indentAfterHeading: true, // two characters, every paragraph
};
// #endregion

// #region page: 大32开 with a head margin larger than the foot
const page = {
  width: mm(TRIM.width), height: mm(TRIM.height), dpi: 150, backgroundColor: col('paper'),
  // 22 + 18 mm leave 163 mm, exactly 28 lines of 16.5 pt; 18 mm a side leave the 103.7 mm
  // measure 0.3 mm to share. A grid that no longer fits is cut down (cjkGridClamped).
  margins: { top: mm(22), bottom: mm(18), left: mm(18), right: mm(18), mirror: true },
};
// #endregion

// #region opener: the title in the Song face's black weight, sunk 8 lines
const SINK = 8; // lines of LEAD: a whole number, so the text under it keeps to the grid
const centred = (y) => ({ anchor: { to: 'container', edge: 'top' }, offset: { y: mm(y) } });
const opener = {
  enabled: true,
  minHeight: pt(SINK * LEAD),
  slot: { elements: [
    // The spacing after the last character is advance, not ink: the title stays centred.
    { kind: 'text', id: 'title', content: '{titleText}', fontFamily: SONG, fontWeight: 900,
      fontSize: pt(46), letterSpacing: pt(23), lineHeight: 1.1, color: col('ink'),
      align: 'center', placement: centred(6) },
    { kind: 'rule', id: 'rule', direction: 'horizontal', thickness: pt(1.2),
      color: col('night'), placement: { ...centred(30), size: { width: mm(8) } } },
    { kind: 'text', id: 'author', content: '{author}', fontFamily: HEI, fontSize: pt(10.5),
      letterSpacing: pt(5), color: col('ink'), align: 'center', placement: centred(34) },
  ] },
};
// Restated: any headings object drops the H1 break (gotcha: headings-drop-h1-break).
const chapter = { level: 1, breakBefore: { enabled: true, parity: 'any' },
  marginTop: pt(0), marginBottom: pt(0), advancedDesign: opener };
// #endregion

// #region heads: the book on the verso, the story on the recto, a hairline under both
const HEAD_Y = 11; // mm from the top edge to the heads; the hairline 5 mm lower
const label = { fontFamily: HEI, fontSize: pt(8), color: col('muted'), pages: 'body' };
const at = (edge, x, y = HEAD_Y) => ({ anchor: { to: 'page', edge },
  offset: { x: mm(x), y: mm(y) } });
const header = { elements: [
  { kind: 'text', id: 'verso-folio', content: '{pageNumber}', parity: 'even', ...label,
    placement: at('top-left', SIDE) },
  { kind: 'text', id: 'verso-book', content: '{title}', parity: 'even', ...label,
    letterSpacing: pt(4), placement: at('top', 0) },
  { kind: 'text', id: 'recto-story', content: '{chapterTitle}', parity: 'odd', ...label,
    letterSpacing: pt(4), placement: at('top', 0) },
  { kind: 'text', id: 'recto-folio', content: '{pageNumber}', parity: 'odd', ...label,
    placement: at('top-right', -SIDE) },
  { kind: 'rule', id: 'hairline', direction: 'horizontal', thickness: pt(0.5), color: col('rule'),
    pages: 'body', placement: { ...at('top-left', SIDE, HEAD_Y + 5), size: { width: mm(MEASURE) } },
  },
] };
// The opener has no head: its folio drops to the foot, centred under the text.
const footer = { elements: [{ kind: 'text', id: 'drop-folio', content: '{pageNumber}',
  ...label, pages: 'opener', align: 'center', placement: at('bottom', 0, -10) }] };
// #endregion

// #region plate: the moonlit melon field faces the opener, the quotation set in Kai
const resources = [{
  id: 'moon', typeId: 'figure', kind: 'svg', createdAt: 0, updatedAt: 0,
  svg: { fileId: 'moon.svg', width: TRIM.width, height: TRIM.height }, // the trim's ratio
  altText: t({
    en: 'A golden full moon in a deep blue sky over a strip of sea. On the sand below, among '
      + 'rows of striped watermelons, a boy with a silver collar stabs a steel fork at the '
      + 'sand ahead of him, and the small animal he aimed at runs off between his legs.',
    es: 'Una luna llena dorada en un cielo azul oscuro sobre una franja de mar. En la arena, '
      + 'entre hileras de sandías rayadas, un muchacho con un aro de plata al cuello clava una '
      + 'horquilla de acero en la arena, delante de él, y el animalillo al que apuntaba huye '
      + 'entre sus piernas.',
  }),
}];
const quote = { fontFamily: KAI, fontSize: pt(14), lineHeight: 1.5, color: col('paper') };
// # 月下的瓜地 {style="plate" line1="…" line2="…" line3="…"}: a page with no head or folio.
// 'page' spans the design over the sheet: a heading's design in the column is cut at its foot.
const plate = {
  id: 'plate', span: 'page', runningChapter: false, toc: false, // out of the PDF outline
  breakBefore: { enabled: true, parity: 'any' }, // (gotcha: style-inherits-break)
  header: { elements: [] }, footer: { elements: [] },
  advancedDesign: { enabled: true, slot: { elements: [
    { kind: 'image', id: 'picture', resourceId: 'moon', placement: { // the whole trim
      anchor: { to: 'bleed', edge: 'top-left' },
      size: { width: mm(TRIM.width), height: mm(TRIM.height) } } },
    { kind: 'text', id: 'line1', content: '{attr.line1}', ...quote, align: 'left',
      placement: { anchor: { to: 'container', edge: 'top-left' }, offset: { y: mm(2) } } },
    { kind: 'text', id: 'line2', content: '{attr.line2}', ...quote, align: 'left',
      placement: { anchor: { to: '#line1', edge: 'below' } } },
    { kind: 'text', id: 'line3', content: '{attr.line3}', ...quote, align: 'left',
      placement: { anchor: { to: '#line2', edge: 'below' } } },
  ] } },
};
// #endregion

// #region styles: the editor's note in 小五 Song, the colophon in Hei
const paragraphStyles = [
  // 小五 (9 pt) nudged to 9.1875 pt: 32 of its characters fill the 28-em measure exactly.
  { id: 'note', fontSize: pt((CHARS * BODY) / 32), lineHeight: pt(LEAD), color: col('ink'),
    firstLineIndent: em(2), marginTop: pt(LEAD) }, // on the grid, a line below the text
  { id: 'colophon', fontFamily: HEI, fontSize: pt(7), lineHeight: pt(11), color: col('muted'),
    textAlign: 'left', firstLineIndent: pt(0), marginTop: pt(LEAD / 2) },
];
// #endregion

const config = () => ({ // a factory: the engine caches resolved configs per object
  locale: 'zh-Hans', // written out, never LANG (gotcha: cjk-locale-tag)
  colorPalette, page, layout: { layoutType: 'single' }, cjk, bodyText,
  // The designs paint the titles; weight 400 keeps the heading blocks in the loaded face.
  headings: { fontFamily: SONG, fontWeight: 400, levels: [chapter] },
  headingStyles: [plate], paragraphStyles, header, footer,
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
Markdown样例 · 141行 · content.en.md
title: "呐喊"
author: "鲁迅"
---

# 月下的瓜地 {style="plate" line1="深蓝的天空中挂着一轮金黄的圆月" line2="下面是海边的沙地" line3="都种着一望无际的碧绿的西瓜"}

# 故乡

我冒了严寒，回到相隔二千余里，别了二十余年的故乡去。

时候既然是深冬；渐近故乡时，天气又阴晦了，冷风吹进船舱中，呜呜的响，从篷隙向外一望，苍黄的天底下，远近横着几个萧索的荒村，没有一些活气。我的心禁不住悲凉起来了。

阿！这不是我二十年来时时记得的故乡？

我所记得的故乡全不如此。我的故乡好得多了。但要我记起他的美丽，说出他的佳处来，却又没有影像，没有言辞了。仿佛也就如此。于是我自己解释说：故乡本也如此，——虽然没有进步，也未必有如我所感的悲凉，这只是我自己心情的改变罢了，因为我这次回乡，本没有什么好心绪。

我这次是专为了别他而来的。我们多年聚族而居的老屋，已经公同卖给别姓了，交屋的期限，只在本年，所以必须赶在正月初一以前，永别了熟识的老屋，而且远离了熟识的故乡，搬家到我在谋食的异地去。

第二日清早晨我到了我家的门口了。瓦楞上许多枯草的断茎当风抖着，正在说明这老屋难免易主的原因。几房的本家大约已经搬走了，所以很寂静。我到了自家的房外，我的母亲早已迎着出来了，接着便飞出了八岁的侄儿宏儿。

我的母亲很高兴，但也藏着许多凄凉的神情，教我坐下，歇息，喝茶，且不谈搬家的事。宏儿没有见过我，远远的对面站着只是看。

但我们终于谈到搬家的事。我说外间的寓所已经租定了，又买了几件家具，此外须将家里所有的木器卖去，再去增添。母亲也说好，而且行李也略已齐集，木器不便搬运的，也小半卖去了，只是收不起钱来。

“你休息一两天，去拜望亲戚本家一回，我们便可以走了。”母亲说。

“是的。”

“还有闰土，他每到我家来时，总问起你，很想见你一回面。我已经将你到家的大约日期通知他，他也许就要来了。”

这时候，我的脑里忽然闪出一幅神异的图画来：深蓝的天空中挂着一轮金黄的圆月，下面是海边的沙地，都种着一望无际的碧绿的西瓜，其间有一个十一二岁的少年，项带银圈，手捏一柄钢叉，向一匹猹尽力的刺去，那猹却将身一扭，反从他的胯下逃走了。

这少年便是闰土。我认识他时，也不过十多岁，离现在将有三十年了；那时我的父亲还在世，家景也好，我正是一个少爷。那一年，我家是一件大祭祀的值年。这祭祀，说是三十多年才能轮到一回，所以很郑重；正月里供祖像，供品很多，祭器很讲究，拜的人也很多，祭器也很要防偷去。我家只有一个忙月（我们这里给人做工的分三种：整年给一定人家做工的叫长年；按日给人做工的叫短工；自己也种地，只在过年过节以及收租时候来给一定的人家做工的称忙月），忙不过来，他便对父亲说，可以叫他的儿子闰土来管祭器的。

我的父亲允许了；我也很高兴，因为我早听到闰土这名字，而且知道他和我仿佛年纪，闰月生的，五行缺土，所以他的父亲叫他闰土。他是能装弶捉小鸟雀的。

我于是日日盼望新年，新年到，闰土也就到了。好容易到了年末，有一日，母亲告诉我，闰土来了，我便飞跑的去看。他正在厨房里，紫色的圆脸，头戴一顶小毡帽，颈上套一个明晃晃的银项圈，这可见他的父亲十分爱他，怕他死去，所以在神佛面前许下愿心，用圈子将他套住了。他见人很怕羞，只是不怕我，没有旁人的时候，便和我说话，于是不到半日，我们便熟识了。

我们那时候不知道谈些什么，只记得闰土很高兴，说是上城之后，见了许多没有见过的东西。

第二日，我便要他捕鸟。他说：

“这不能。须大雪下了才好。我们沙地上，下了雪，我扫出一块空地来，用短棒支起一个大竹匾，撒下秕谷，看鸟雀来吃时，我远远地将缚在棒上的绳子只一拉，那鸟雀就罩在竹匾下了。什么都有：稻鸡、角鸡、鹁鸪、蓝背……”

我于是又很盼望下雪。

闰土又对我说：

“现在太冷，你夏天到我们这里来。我们日里到海边检贝壳去，红的绿的都有，鬼见怕也有，观音手也有，晚上我和爹管西瓜去，你也去。”

“管贼么？”

“不是。走路的人口渴了摘一个瓜吃，我们这里是不算偷的。要管的是獾猪、刺猬、猹。月亮地下，你听，啦啦的响了，猹在咬瓜了。你便捏了胡叉，轻轻地走去……”

我那时并不知道这所谓猹的是怎么一件东西——便是现在也没有知道——只是无端的觉得状如小狗而很凶猛。

“他不咬人么？”

“有胡叉呢。走到了，看见猹了，你便刺。这畜生很伶俐，倒向你奔来，反从胯下窜了。他的皮毛是油一般的滑。……”

我素不知道天下有这许多新鲜事：海边有如许五色的贝壳；西瓜有这样危险的经历，我先前单知道他在水果店里出卖罢了。

“我们沙地里，潮汛要来的时候，就有许多跳鱼儿只是跳，都有青蛙似的两个脚。……”

阿！闰土的心里有无穷无尽的希奇的事，都是我往常的朋友所不知道的。他们不知道一些事，闰土在海边时，他们都和我一样只看见院子里高墙上的四角的天空。

可惜正月过去了，闰土须回家里去，我急得大哭，他也躲到厨房里，哭着不肯出门，但终于被他父亲带走了。他后来还托他的父亲带给我一包贝壳和几枝很好看的鸟毛，我也曾送他一两次东西，但从此没有再见面。

现在我的母亲提起了他，我这儿时的记忆，忽而全都闪电似的苏生过来，似乎看到了我的美丽的故乡了。我应声说：

“这好极！他，——怎样？……”

“他？……他景况也很不如意……”母亲说着，便向房外看，“这些人又来了。说是买木器，顺手也就随便拿走的，我得去看看。”

母亲站起身，出去了。门外有几个女人的声音，我便招宏儿走近面前，和他闲话：问他可会写字，可愿意出门。

“我们坐火车去么？”

“我们坐火车去。”

“船呢？”

“先坐船，……”

“哈！这模样了！胡子这么长了！”一种尖利的怪声突然大叫起来。

我吃了一吓，赶忙抬起头，却见一个凸颧骨，薄嘴唇，五十岁上下的女人站在我面前，两手搭在髀间，没有系裙，张着两脚，正像一个画图仪器里细脚伶仃的圆规。

我愕然了。

“不认识了么？我还抱你咧！”

我愈加愕然了。幸而我的母亲也就进来，从旁说：

“他多年出门，统忘却了。你该记得罢，”便向着我说，“这是斜对门的杨二嫂，……开豆腐店的。”

哦，我记得了。我孩子时候，在斜对门的豆腐店里确乎终日坐着一个杨二嫂，人都叫伊“豆腐西施”。但是擦着白粉，颧骨没有这么高，嘴唇也没有这么薄。而且终日坐着，我也从没有见过这圆规式的姿势。那时人说：因为伊，这豆腐店的买卖非常好。但这大约因为年龄的关系，我却并未蒙着一毫感化，所以竟完全忘却了。然而圆规很不平，显出鄙夷的神色，仿佛嗤笑法国人不知道拿破仑，美国人不知道华盛顿似的，冷笑说：

“忘了？这真是贵人眼高。……”

“那有这事……我……”我惶恐着，站起来说。

“那么，我对你说。迅哥儿，你阔了，搬动又笨重，你还要什么这些破烂木器，让我拿去罢。我们小户人家，用得着。”

“我并没有阔哩。我须卖了这些，再去……”

“阿呀呀，你放了道台了，还说不阔？你现在有三房姨太太；出门便是八抬的大轿，还说不阔？吓，什么都瞒不过我。”

我知道无话可说了，便闭了口，默默的站着。

“阿呀阿呀，真是愈有钱，便愈是一毫不肯放松，愈是一毫不肯放松，便愈有钱……”圆规一面愤愤的回转身，一面絮絮的说，慢慢向外走，顺便将我母亲的一副手套塞在裤腰里，出去了。

此后又有近处的本家和亲戚来访问我。我一面应酬，偷空便收拾些行李，这样的过了三四天。

一日是天气很冷的午后，我吃过午饭，坐着喝茶，觉得外面有人进来了，便回头去看。我看时，不由的非常出惊，慌忙站起身，迎着走去。

这来的便是闰土。虽然我一见便知道是闰土，但又不是我这记忆上的闰土了。他身材增加了一倍；先前的紫色的圆脸，已经变作灰黄，而且加上了很深的皱纹；眼睛也像他父亲一样，周围都肿得通红，这我知道，在海边种地的人，终日吹着海风，大抵是这样的。他头上是一顶破毡帽，身上只一件极薄的棉衣，浑身瑟索着；手里提着一个纸包和一枝长烟管，那手也不是我所记得的红活圆实的手，却又粗又笨而且开裂，像是松树皮了。

我这时很兴奋，但不知道怎么说才好，只是说：

“阿！闰土哥，——你来了？……”

我接着便有许多话，想要连珠一般涌出：角鸡、跳鱼儿、贝壳、猹，……但又总觉得被什么挡着似的。单在脑里面回旋，吐不出口外去。

他站住了，脸上现出欢喜和凄凉的神情；动着嘴唇，却没有作声。他的态度终于恭敬起来了，分明的叫道：

“老爷！……”

我似乎打了一个寒噤；我就知道，我们之间已经隔了一层可悲的厚障壁了。我也说不出话。

:::paragraphs{style="note"}
（本篇作于1921年1月，同年5月1日发表于《新青年》第9卷第1号，1923年8月收入小说集《呐喊》。这里节选前半篇，至闰土来访为止。文字据1948年版《鲁迅全集》第一卷，改排为简体横排：引号『』改作“”，“馀”“偸”改作“余”“偷”。）
:::

:::paragraphs{style="colophon"}
本书正文用Noto Serif SC五号字排，每行28字，每面28行；书眉、页码和版本说明用Noto Sans SC，篇首题句用Ma Shan Zheng，均为SIL OFL字体。篇首插图由程序绘制。
:::

:::paragraphs{style="colophon"}
Lu Xun, 故乡 (My Old Home), 1921: the first half of the story · Text: public domain, from zh.wikisource · Plate: drawn in code.
:::
`; // content.<lang>.md, inlined by the Cookbook

// #region art: the boy, the moon and the melon field, drawn in millimetres at the trim size
function mulberry32(seed) { // a seeded PRNG: the same field on every run
  return () => {
    seed = (seed + 0x6d2b79f5) | 0;
    let r = Math.imul(seed ^ (seed >>> 15), 1 | seed);
    r = (r + Math.imul(r ^ (r >>> 7), 61 | r)) ^ r;
    return ((r ^ (r >>> 14)) >>> 0) / 4294967296;
  };
}
const mix = (hex, other, k) => `#${[1, 3, 5].map((i) => Math.round(
  parseInt(hex.slice(i, i + 2), 16) * (1 - k) + parseInt(other.slice(i, i + 2), 16) * k)
  .toString(16).padStart(2, '0')).join('')}`;
const n2 = (v) => +v.toFixed(2);
function drawPlate(W, H) {
  const rnd = mulberry32(1921);
  const P = palette;
  const out = [];
  const rect = (y0, y1, fill) => out.push(`<rect x="0" y="${n2(y0)}" width="${W}" `
    + `height="${n2(y1 - y0)}" fill="${fill}"/>`);
  const circle = (cx, cy, r, fill, extra = '') => out.push(`<circle cx="${n2(cx)}" `
    + `cy="${n2(cy)}" r="${n2(r)}" fill="${fill}"${extra}/>`);
  const line = (pts, color, w) => out.push(`<path d="M${pts.map(([x, y]) => `${n2(x)} ${n2(y)}`)
    .join('L')}" fill="none" stroke="${color}" stroke-width="${n2(w)}" `
    + 'stroke-linecap="round" stroke-linejoin="round"/>');
  const HORIZON = 112; // mm: the line of the sea
  const SHORE = 120; // mm: where the sand begins
  // The sky in four flat steps, darkest at the top; the moon in three rings of light.
  [[0, 0], [56, 0.06], [84, 0.12], [100, 0.19]].forEach(([y, k]) => rect(y, HORIZON,
    mix(P.night, '#6f8fb8', k)));
  const [MX, MY] = [98, 66];
  [[30, 0.1], [23, 0.15], [17.5, 0.22]].forEach(([r, k]) => circle(MX, MY, r,
    mix(P.night, '#9fb6d4', k)));
  circle(MX, MY, 13, P.moon);
  circle(MX - 3.8, MY - 2.6, 2.4, mix(P.moon, '#ffffff', 0.22));
  circle(MX + 4.4, MY + 3.6, 1.6, mix(P.moon, P.night, 0.1));
  // The sea: a dark strip, the moon's path broken on the swell.
  rect(HORIZON, SHORE, mix(P.night, '#0f2a33', 0.55));
  for (let i = 0; i < 9; i++) {
    const w = 1.5 + rnd() * (4 + i * 0.8);
    out.push(`<rect x="${n2(MX - w / 2 + (rnd() - 0.5) * 5)}" y="${n2(HORIZON + 0.8 + i * 0.8)}" `
      + `width="${n2(w)}" height="0.35" fill="${mix(P.moon, P.night, 0.1 + i * 0.06)}"/>`);
  }
  // The sand, in two tones.
  rect(SHORE, H, P.sand);
  out.push(`<path d="M0 ${SHORE + 12}C35 ${SHORE + 6} 80 ${SHORE + 16} ${W} ${SHORE + 8}`
    + `L${W} ${H}L0 ${H}Z" fill="${mix(P.sand, P.melon, 0.07)}"/>`);
  // Rows of melons to the sea: each nearer row lower, larger and sparser.
  const [leaf, stripe] = [mix(P.melon, P.ink, 0.25), mix(P.melon, P.ink, 0.5)];
  const melon = (x, y, s) => {
    out.push(`<ellipse cx="${n2(x)}" cy="${n2(y)}" rx="${n2(s)}" ry="${n2(s * 0.66)}" `
      + `fill="${P.melon}"/>`);
    for (const k of [-0.62, -0.2, 0.2, 0.62]) { // stripes follow the melon's curve
      out.push(`<path d="M${n2(x - s * 0.96)} ${n2(y)}Q${n2(x)} ${n2(y + k * s * 1.3)} `
        + `${n2(x + s * 0.96)} ${n2(y)}" fill="none" stroke="${stripe}" `
        + `stroke-width="${n2(s * 0.11)}" stroke-linecap="round"/>`);
    }
    out.push(`<ellipse cx="${n2(x - s * 0.38)}" cy="${n2(y - s * 0.34)}" rx="${n2(s * 0.3)}" `
      + `ry="${n2(s * 0.1)}" fill="${mix(P.melon, '#ffffff', 0.35)}"/>`);
  };
  const leafAt = (x, y, s, a) => out.push(`<path d="M0 0C${n2(s * 0.3)} ${n2(-s * 0.9)} `
    + `${n2(s * 1.4)} ${n2(-s * 0.8)} ${n2(s * 1.6)} 0C${n2(s * 1.4)} ${n2(s * 0.7)} `
    + `${n2(s * 0.3)} ${n2(s * 0.8)} 0 0Z" fill="${leaf}" `
    + `transform="translate(${n2(x)} ${n2(y)}) rotate(${n2(a)})"/>`);
  const rows = 8;
  const rowY = (row) => SHORE + 3 + (H - SHORE + 8) * ((row + 1) / rows) ** 1.8;
  const field = [];
  for (let row = 0; row < rows; row++) {
    const depth = (row + 1) / rows; // 0 far, 1 near
    const y = rowY(row);
    const s = 0.8 + 6.4 * depth ** 1.7; // a melon's half-length, mm
    const wave = (x) => y + Math.sin(x / 11 + row * 1.7) * (0.3 + depth * 1.2);
    const vine = [];
    for (let x = -3; x <= W + 3; x += 3) vine.push([x, wave(x)]);
    line(vine, leaf, 0.15 + depth * 0.45);
    for (let x = rnd() * s * 4; x < W + s; x += s * (3.2 + rnd() * 3.4)) {
      field.push({ row, x, y: wave(x) - s * 0.5, s, depth });
    }
  }
  // The boy with the silver collar stabs at the badger-like zha, which slips between his legs.
  const boy = { x: 47, y: rowY(4) + 2, h: 31 }; // feet on the fifth row
  for (const m of field) {
    if (m.row === 4 && m.x > boy.x - 14 && m.x < boy.x + 32) continue; // his patch, the fork's
    leafAt(m.x - m.s * 0.6, m.y + m.s * 0.4, m.s * 0.9, 190 + rnd() * 40);
    leafAt(m.x + m.s * 0.5, m.y + m.s * 0.45, m.s * 0.8, -20 + rnd() * 40);
    melon(m.x, m.y, m.s);
  }
  const figure = mix(P.night, P.ink, 0.35);
  const u = boy.h / 30; // the figure is drawn on a 30-unit height
  const at = (x, y) => [boy.x + x * u, boy.y - y * u];
  const xy = (x, y) => at(x, y).map(n2).join(' ');
  const steel = mix(P.sand, '#ffffff', 0.4);
  line([at(-1, 12), at(-5.5, 0.4)], figure, 2 * u); // the back leg
  line([at(1.2, 12), at(6, 5.5), at(7.5, 0.4)], figure, 2 * u); // the front knee bent
  out.push(`<path d="M${xy(-3.2, 22.6)}L${xy(3.4, 22.6)}L${xy(4.2, 11)}L${xy(-3.8, 11)}Z" `
    + `fill="${figure}"/>`); // the tunic
  // The silver collar round the neck: its back arc behind the neck, its front arc over it.
  const collar = (sweep) => out.push(`<path d="M${xy(-1.2, 23.1)}A${n2(1.6 * u)} `
    + `${n2(0.55 * u)} 0 0 ${sweep} ${xy(2, 23.1)}" fill="none" stroke="${steel}" `
    + `stroke-width="${n2(0.55 * u)}"/>`);
  collar(1);
  line([at(0.4, 22.2), at(0.4, 24.4)], figure, 2 * u); // the neck
  circle(...at(0.4, 26.4), 2.9 * u, figure); // the head
  collar(0);
  line([at(2.6, 21.5), at(8.2, 11.8)], figure, 1.5 * u); // both hands on the shaft
  line([at(-2.4, 21), at(4.4, 14.3)], figure, 1.5 * u);
  // The steel fork stabs down at the sand: a shaft, a crossbar and three parallel tines.
  const [butt, head] = [[-3, 19.4], [19, 4.4]];
  const len = Math.hypot(head[0] - butt[0], head[1] - butt[1]);
  const [dx, dy] = [(head[0] - butt[0]) / len, (head[1] - butt[1]) / len];
  const across = (k) => [head[0] - k * 1.3 * dy, head[1] + k * 1.3 * dx];
  line([at(...butt), at(...head)], steel, 0.55 * u);
  line([at(...across(-1)), at(...across(1))], steel, 0.45 * u);
  for (const k of [-1, 0, 1]) {
    const [x0, y0] = across(k);
    line([at(x0, y0), at(x0 + 3.8 * dx, y0 + 3.8 * dy)], steel, 0.45 * u);
  }
  // The zha he aimed at has slipped between his legs and runs off to the left, tail up.
  const fur = mix(P.sand, P.ink, 0.62);
  const [zx, zy] = at(0.6, 1.6);
  out.push(`<path d="M${n2(zx - 4.6 * u)} ${n2(zy - 0.2 * u)}L${n2(zx - 2.6 * u)} `
    + `${n2(zy - 1.6 * u)}C${n2(zx)} ${n2(zy - 2.4 * u)} ${n2(zx + 3 * u)} ${n2(zy - 1.8 * u)} `
    + `${n2(zx + 3.4 * u)} ${n2(zy - 0.2 * u)}C${n2(zx + 2 * u)} ${n2(zy + 1 * u)} `
    + `${n2(zx - 2 * u)} ${n2(zy + 1 * u)} ${n2(zx - 4.6 * u)} ${n2(zy - 0.2 * u)}Z" `
    + `fill="${fur}"/>`); // a pointed snout, a round back
  line([[zx + 3 * u, zy - 1 * u], [zx + 4.8 * u, zy - 2.8 * u]], fur, 0.7 * u); // tail
  [[-2, 1.8], [-0.8, 2.2], [1.4, 2], [2.6, 1.6]].forEach(([ddx, ddy], i) => line(
    [[zx + ddx * u, zy + 0.4 * u], [zx + (ddx + (i % 2 ? 1 : -1)) * u, zy + ddy * u]],
    fur, 0.45 * u)); // legs mid-stride
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${W}mm" height="${H}mm" `
    + `viewBox="0 0 ${W} ${H}">${out.join('')}</svg>`;
}
// #endregion

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = { // every face the pages use, loaded before the build (gotcha: fonts-first)
  'Noto Serif SC': ['400', '900'], // SONG: the text; the title
  'Noto Sans SC': ['400'], // HEI: running heads, folios, the author, the colophon
  'Ma Shan Zheng': ['400'], // KAI: the plate's quotation
};

// ─── 4 · Build & show ───────────────────────────────────────────────────────
// Each voice loads the files of the characters it sets (gotcha: cjk-fonts-slices).
const part = (re) => markdown.match(re)?.[0] ?? '';
const colophon = part(/:::paragraphs\{style="colophon"\}[\s\S]*$/);
await loadFonts(FONTS, markdown);
await loadCjkFonts({ [SONG]: ['400'] }, markdown);
await loadCjkFonts({ [SONG]: ['900'] }, '故乡');
await loadCjkFonts({ [HEI]: ['400'] }, `呐喊故乡鲁迅0123456789${colophon}`);
await loadCjkFonts({ [KAI]: ['400'] }, part(/^# .*style="plate".*$/m));
await loadSvg('moon.svg', drawPlate(TRIM.width, TRIM.height));
// The plate is page 70 of the book, a verso: folios and parity follow the book.
const continuation = { pageIndexOffset: 69, pageNumbering: { startAt: 70 } };
const doc = await buildWithFonts(
  () => buildDocument({ markdown, resources, continuation }, config()), markdown);
showPages(doc, { title: t({ en: 'A Chinese novel page on a 28 × 28 grid',
  es: 'Una página de novela china en una retícula de 28 × 28' }) });
offerPdf(() => renderToPdf(doc, { fontProvider: cjkPdfProvider, resourceBytes: imageBytes }),
  `${RECIPE}.pdf`);

工具包 · core, fonts, viewer, pdf, images, cjk：每道食谱都相同 · 457行
// ─── 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 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:
 *  letters beyond Latin-1 (č, ł, ő…) also load the latin-ext files. With
 *  `optional`, a face Fontsource does not ship is skipped instead of failing.
 *  Resolves to the number of faces added. */
async function loadFonts(faces, text = '', { optional = false } = {}) {
  kitStatus('Loading fonts…');
  const ranges = {
    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',
  };
  const subsets = /[Ā-˿Ḁ-ỿ]/.test(text) ? ['latin', 'latin-ext'] : ['latin'];
  const jobs = [];
  let added = 0;
  for (const [family, specs] of Object.entries(faces)) {
    const id = fontsourceId(family);
    const meta = optional ? await fontsourceMeta(family) : null;
    for (const spec of new Set(specs)) {
      const weight = parseInt(spec, 10);
      const style = spec.endsWith('i') ? 'italic' : 'normal';
      if (hasFace(family, weight, style)) continue;
      if (optional && !(meta?.weights.includes(weight) && meta.styles.includes(style))) continue;
      for (const subset of subsets) {
        const url = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${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().then((ready) => { document.fonts.add(ready); added++; }, () => {
          if (subset === 'latin' && !optional) throw new Error(`Fontsource has no ${family} ${weight} ${style}`);
        }));
      }
    }
  }
  await Promise.all(jobs).catch((error) => { kitFail(error); throw error; });
  return added;
}

/** 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 · images v1 ── recipes with pictures · postext.dev/cookbook ──────────
/** Registers a photo or PNG for the canvas and keeps its bytes for the PDF.
 *  fetch → ImageBitmap never taints the canvas (a plain cross-origin <img> would). */
async function loadImage(fileId, url) {
  const res = await fetch(url);
  if (!res.ok) throw new Error(`Image not found (${res.status}): ${url}`);
  const bytes = new Uint8Array(await res.arrayBuffer());
  registerResourceImage(fileId, await createImageBitmap(new Blob([bytes])));
  (loadImage.bytes ??= new Map()).set(fileId, bytes);
}

/** Registers SVG markup (drawn in code, or fetched) as a vector image. */
async function loadSvg(fileId, svg) {
  const img = new Image();
  img.src = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svg)}`;
  await img.decode();
  registerResourceImage(fileId, img);
  (loadImage.bytes ??= new Map()).set(fileId, new TextEncoder().encode(svg));
}

/** renderToPdf({ resourceBytes: imageBytes }) */
function imageBytes(fileId) { return loadImage.bytes?.get(fileId); }

/** renderToHtml({ resourceImageUrl: imageUrl }) */
function imageUrl(fileId) {
  const bytes = imageBytes(fileId);
  if (!bytes) return undefined;
  imageUrl.urls ??= new Map();
  if (!imageUrl.urls.has(fileId)) {
    const type = /\.svg$/i.test(fileId) ? 'image/svg+xml' : /\.png$/i.test(fileId) ? 'image/png' : 'image/jpeg';
    imageUrl.urls.set(fileId, URL.createObjectURL(new Blob([bytes], { type })));
  }
  return imageUrl.urls.get(fileId);
}

// ─── 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 ───────────────────────────────────────────────────────────────────────