# 竖排日文的跨页旁注

> 一叶《たけくらべ》第一章带七条傍注：（1）标在行的右侧，一个跨页两页的注都排在左页的切口一侧。

- HTML版本: https://postext.dev/zh/cookbook/vertical-notes-and-sidenotes
- 食谱 No. 121 · 框与注释 · 难度 2 (中级) · 输出: Canvas, PDF
- 体裁: 小说、戏剧与文学散文
- 需要 postext ≥ 1.16.1, postext-pdf ≥ 1.16.1 · 已用 1.16.1, postext-pdf 1.16.1 测试，日期 2026-10-05
- 页面: [一](https://postext.dev/cookbook/vertical-notes-and-sidenotes/en/p01.webp?v=b6e7e24f), [二](https://postext.dev/cookbook/vertical-notes-and-sidenotes/en/p02.webp?v=b6e7e24f), [三](https://postext.dev/cookbook/vertical-notes-and-sidenotes/en/p03.webp?v=b6e7e24f), [四](https://postext.dev/cookbook/vertical-notes-and-sidenotes/en/p04.webp?v=b6e7e24f)
- PDF: https://postext.dev/cookbook/vertical-notes-and-sidenotes/en/vertical-notes-and-sidenotes.pdf?v=b6e7e24f
- 在沙盒中打开: https://postext.dev/zh/sandbox#recipe=vertical-notes-and-sidenotes&lang=en (.postext: https://postext.dev/cookbook/vertical-notes-and-sidenotes/en/vertical-notes-and-sidenotes.postext)
- 最后更新: 2026-10-05
- 其他语言: [en](https://postext.dev/en/cookbook/vertical-notes-and-sidenotes.md), [es](https://postext.dev/es/cookbook/vertical-notes-and-sidenotes.md), [ca](https://postext.dev/ca/cookbook/vertical-notes-and-sidenotes.md), [ja](https://postext.dev/ja/cookbook/vertical-notes-and-sidenotes.md), [ar](https://postext.dev/ar/cookbook/vertical-notes-and-sidenotes.md)

## 简单来说

一篇日本古典小说，附有对旧地名的简短解释。小号编号标在正文旁边，打开的两页上的解释都集中在左页的外侧边缘。

## 成品一览

四六判樋口一葉《たけくらべ》（1895–96）的四页，第一章，附七条注释，讲它所写的旧吉原一带。这些注释是傍注（bōchū），日本古典文库本的旁注：小号的（1）标在所释词语之后、行的右侧，一个跨页两页上引出的注释都排在左页的切口一侧，上面一条长为行长三分之一的线，字号小五分之一。读者不必翻页就能找到每一条注。正文每行42字、共17行，用9.25 pt的Shippori Mincho，保留一葉那一整个长段落和ぎつちよんちよん上的芝麻点。欧洲小说的栏脚注见[Nº 071](https://postext.dev/zh/cookbook/novel-footnotes-column-foot.md)。

**这份食谱回答的问题:**

- 怎样把竖排日文书的注释排在正文旁边，按跨页集中？
- 脚注怎么做？
- 日文不用斜体时，怎样加芝麻着重号或旁线？

## 简短回答

```js
// script.js, 行 32–48
// placement 'spread' gathers the notes cited on the two pages of a spread at the end of the
// left-hand page's text, the fore-edge in a book bound on the right, under a rule a third of
// the line long, and numbers them per spread. The marker （1） stands small at the right of
// the line, its digits upright, and the note opens with its number and a full note-em.
const footnotes = {
  placement: 'spread', // 傍注; 'chapterEnd' sets 後注 after the chapter instead
  numbering: 'spread',
  markerPosition: 'right', markerTemplate: '（{n}）', // written out: 'ja' sets them so
  numberGap: 'em', hangingIndent: em(2), // turnovers clear the number
  fontSize: em(0.8), lineHeight: em(1.5),
  separator: { width: 1 / 3, lineWidth: pt(0.5), color: col('plum') },
};
// Ichiyō's sesame marks (傍点) over ぎつちよんちよん: the mark Japan uses, right of the line.
const cjk = {
  grid: { enabled: true, charsPerLine: CHARS, linesPerPage: LINES },
  emphasisMark: { style: 'sesame', position: 'over' },
};
```

## 用料

**讲解**

- [日文书的注释](https://postext.dev/zh/docs/japanese-layout.md#注释): 按日文书的方式排注释。竖排时注号为（1），数字直立，排在行的右侧，注文集中在章末（後注）；横排时注文在页脚，每页重新编号，上面有占版心宽度三分之一的线。footnotes.placement: 'spread'把旁注（傍注）排在每个跨页左页的切口一侧，footnotes.markerPosition: 'side'把小号注号排在词旁的行间（合印）。
- [脚注](https://postext.dev/zh/docs/document-format.md#脚注): 用[^id]引用的注释，排在引用它的那一栏底部，或排在章末，按章或全书连续编号。
- [日文着重号（傍点）](https://postext.dev/zh/docs/japanese-layout.md#傍点): 日文用字旁的标记表示强调，不用斜体：在标记为ja的文档中，*…*或:dots[…]会在横排文字上方、竖排文字右侧加芝麻点﹅。cjk.emphasisMark可以改变形状（芝麻点、圆点、圆圈、三角……）、实心或空心，以及所在的一侧。

**还用到**

- [竖排](https://postext.dev/zh/docs/configuration.md#竖排)
- [右翻书](https://postext.dev/zh/docs/configuration.md#装订)
- [振假名：汉字上的假名注音](https://postext.dev/zh/docs/japanese-layout.md#振假名)
- [竖排中的横排数字](https://postext.dev/zh/docs/configuration.md#竖排中的数字)
- [日文数字与假名序号](https://postext.dev/zh/docs/japanese-layout.md#数字与编号)
- [占行标题（行取り）](https://postext.dev/zh/docs/japanese-layout.md#标题与文字块)
- [字符网格](https://postext.dev/zh/docs/configuration.md#字格)
- [日文禁则处理](https://postext.dev/zh/docs/japanese-layout.md#断行禁则)
- [导入青空文库文本](https://postext.dev/zh/docs/japanese-layout.md#青空文库源文本)
- [中日韩字体](https://postext.dev/zh/docs/configuration.md#中文日文和韩文字体)
- [书眉与页码](https://postext.dev/zh/docs/configuration.md#页眉与页脚)
- [按页面角色显示书眉](https://postext.dev/zh/docs/configuration.md#文本元素)
- [标题样式](https://postext.dev/zh/docs/configuration.md#标题样式)
- [设计过的章首页](https://postext.dev/zh/docs/configuration.md#通栏与高级设计)
- [对称页边距](https://postext.dev/zh/docs/configuration.md#镜像页边距)
- [语义调色板](https://postext.dev/zh/docs/configuration.md#调色板)
- [导出PDF](https://postext.dev/zh/docs/configuration.md#生成pdf)
- [中文断行](https://postext.dev/zh/docs/configuration.md#东亚排版)
- [着重号、专名号与书名号](https://postext.dev/zh/docs/document-format.md#中文标记注音和双行夹注)
- [标题属性](https://postext.dev/zh/docs/document-format.md#标题属性)
- [纸张颜色](https://postext.dev/zh/docs/configuration.md#页面)
- [嵌入PDF的字体](https://postext.dev/zh/docs/configuration.md#为什么需要字体提供函数)
- [罗马数字页码的前置部分](https://postext.dev/zh/docs/document-format.md#numbering)
- [注音：拼音与注音符号](https://postext.dev/zh/docs/document-format.md#中文标记注音和双行夹注)

**配置一览**

- [`bodyText`](https://postext.dev/zh/docs/configuration.md#正文), [`cjk`](https://postext.dev/zh/docs/configuration.md#东亚排版), [`colorPalette`](https://postext.dev/zh/docs/configuration.md#调色板), [`footer`](https://postext.dev/zh/docs/configuration.md#页眉与页脚), `footnotes`, [`header`](https://postext.dev/zh/docs/configuration.md#页眉与页脚), [`headings`](https://postext.dev/zh/docs/configuration.md#标题), [`layout`](https://postext.dev/zh/docs/configuration.md#版式), [`locale`](https://postext.dev/zh/docs/configuration.md#断词), [`page`](https://postext.dev/zh/docs/configuration.md#页面)

**API**

- [`buildDocument`](https://postext.dev/zh/docs/configuration.md#构建文档), [`clearMeasurementCache`](https://postext.dev/zh/docs/configuration.md#测量缓存), [`decompressWoff2`](https://postext.dev/zh/docs/configuration.md#浏览器字体提供函数fontsource--woff2), `loadVerticalAlternates`, [`renderPageToCanvas`](https://postext.dev/zh/docs/configuration.md#把页面渲染为位图), [`renderToPdf`](https://postext.dev/zh/docs/configuration.md#生成pdf)

**字体**

- Shippori Mincho (OFL-1.1), Noto Sans JP (OFL-1.1)

## 做法

### 1 · 把跨页的注释集中在左页切口

代码见上文的[简短回答](#简短回答)。`footnotes.placement: 'spread'`把第2、3页上引出的注释排在第3页正文的末尾，在右侧装订的书中就是它的切口一侧；`numbering: 'spread'`让每个跨页的注释从（1）开始编号（[脚注](/zh/docs/configuration#脚注)）。在右页引出的注释要等到左页才排；如果注释让左页剩下不到一行正文，其余的注释就留在右页的脚部，JLReq允许这样做。标为`ja`的文档已经把竖排书的注释编号排成`（{n}）`，放在行的右侧，0.7 em，数字直立：这里写出的两行只是展示这一点。`numberGap: 'em'`在编号后放一个注释字号的全角空格，`hangingIndent: em(2)`让转行与编号之后的文字对齐。

### 2 · 把编号放在日文放它的位置

Markdown在所释词语之后写`見返り柳[^1]`，把注释写成章末的`[^1]: …`段落。编号跟在所释词语之后；结束一句的编号放在。之前（`…先生[^1]。`），引擎不让。或编号出现在行首。七条注释是为本食谱写的，用平实的现代日文说明見返り柳和お齒ぐろ溝是什么，大音寺前在哪里，酉の市上卖什么。

### 3 · 保留原文的芝麻点

`cjk.emphasisMark`决定本书中`*…*`和`:dots[…]`印出什么：芝麻点，位于竖排行的右侧。`ja`文档本来就用它；写出来之后，用料列表里会出现着重号这一项。青空文库的文本给ぎつちよんちよん加了傍点，`aozora.py`把它写成`:dots[ぎつちよんちよん]{style=sesame}`；中文书则把点放在行的下方（[着重号、注音与夹注](/zh/docs/configuration#着重号注音与夹注)）。

### 4 · 从一个跨页开始

```js
// script.js, 行 52–71
// Page-anchored design on a vertical page: x runs down the page from its top edge, y across
// it leftwards from its right edge. The title stands on the page's axis, the author lower.
const PT = 25.4 / 72; // mm in a point
const page = (down, across) => ({ anchor: { to: 'page', edge: 'top-left' },
  offset: { x: mm(down), y: mm(across) } });
const TITLE = 26; // pt
// gotcha: headings-drop-h1-break
const story = { level: 1, breakBefore: { enabled: true, parity: 'any' },
  advancedDesign: { enabled: true, minHeight: lines(LINES), slot: { elements: [
    { kind: 'text', id: 'title', content: '{titleText}', fontFamily: MINCHO, fontWeight: 700,
      fontSize: pt(TITLE), lineHeight: 1, letterSpacing: pt(TITLE / 2), color: col('ink'),
      placement: page(42, 127 / 2 - (TITLE * PT) / 2) },
    { kind: 'rule', id: 'rule', direction: 'horizontal', thickness: pt(0.6), color: col('plum'),
      placement: { ...page(42, 127 / 2 + (TITLE * PT) / 2 + 5), size: { width: mm(24) } } },
    { kind: 'text', id: 'author', content: '{author}', fontFamily: MINCHO, fontSize: pt(12),
      letterSpacing: pt(4), color: col('ink'),
      placement: page(118, 127 / 2 + (TITLE * PT) / 2 + 3) },
  ] } } };
const section = { level: 2, fontFamily: MINCHO, fontWeight: 700, fontSize: pt(11),
  lineSpan: 3, indent: em(7) }; // 3行取り, seven characters down, as the Aozora text marks it
```

本章的第一句在头三行里就引出四条注释。如果在第1页的标题下排正文，这些注释只给正文留下三行的地方：左页只放自己的注释，不放别页的。把书名页单独放在第1页，本章就移到第2页，一个右页，于是第一个跨页同时容纳正文和它的全部注释。书名页是一个一级标题，它的设计占满整页，锚定在成品页面上，所以书名立在页面的中轴上。

### 5 · 柱和页码排在切口

```js
// script.js, 行 75–89
const foreEdge = (id, content, parity, edge, y, pages) => ({
  kind: 'text', id, content, parity, pages, writingMode: 'vertical-rl',
  fontFamily: GOTHIC, fontSize: pt(7), letterSpacing: pt(1), color: col('muted'),
  overflow: 'clip', placement: { anchor: { to: 'outer', edge }, offset: { y: em(y) } },
});
const header = { elements: [
  foreEdge('hashira', '{title}', 'odd', 'top', 2, 'body'),
  foreEdge('folio', '{pageNumber}', 'all', 'bottom', -2, 'body'),
] };
// The title page carries the colophon across the foot, in the edition's language.
const footer = { elements: [{ kind: 'text', id: 'colophon', content: '{attr.colophon}',
  pages: 'opener', fontFamily: GOTHIC, fontSize: pt(5.5), lineHeight: 1.45,
  color: col('muted'), overflow: 'wrap', align: 'center',
  placement: { anchor: { to: 'page', edge: 'bottom' }, offset: { y: mm(-6) },
    size: { width: mm(100) } } }] };
```

书名沿左页的外页边距竖排，在注释之外；除书名页外，每一页的底部都有汉字页码。

## 完整食谱

一个文件，由食谱文件夹合成，示例文本和排版食谱的公共工具包都已内联；它自己排出页面。要运行它，把它放进空白页面的`<script type="module">`，或粘贴到新建CodePen的JS面板里（设为模块）。它从esm.sh导入postext，不需要安装或构建。

- 食谱文件夹: https://github.com/drnachio/postext/tree/main/cookbook/vertical-notes-and-sidenotes

### script.js

```js
// ═══ Postext Cookbook · Nº 121 · Notes beside a vertical Japanese text, across the spread ══
// https://postext.dev/en/cookbook/vertical-notes-and-sidenotes
// Code: MIT · Text: 樋口一葉『たけくらべ』, Aozora Bunko 389 (PD); notes CC BY 4.0 · Pictures: none
// Fonts: Shippori Mincho, Noto Sans JP (SIL OFL 1.1) · Needs postext ≥ 1.16.1
import {
  buildDocument, renderPageToCanvas, clearMeasurementCache, loadVerticalAlternates,
} from 'https://esm.sh/postext';
import { renderToPdf, decompressWoff2 } from 'https://esm.sh/postext-pdf';

const LANG = 'en'; // @lang: the language of the colophon; the story is Japanese in both
const RECIPE = 'vertical-notes-and-sidenotes';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
// #region palette: ink, a muted plum for the note numbers' rule, cream paper
const palette = {
  ink: '#211d1b', // the text and the notes
  plum: '#6b3a55', // 紫: the rule over the notes, the engine's defaults
  muted: '#6b645d', // the hashira and the folios
  paper: '#fbf7ef',
};
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: 'defaults', value: { hex: palette.plum, model: 'hex' } },
];
// #endregion
const [MINCHO, GOTHIC] = ['Shippori Mincho', 'Noto Sans JP'];
const [BODY, LEAD, CHARS, LINES] = [9.25, 16.25, 42, 17]; // pt, pt: 四六判 42字 × 17行
const lines = (n) => pt(n * LEAD);

// #region answer: 傍注, the notes of both pages of a spread at the fore-edge of the left one
// placement 'spread' gathers the notes cited on the two pages of a spread at the end of the
// left-hand page's text, the fore-edge in a book bound on the right, under a rule a third of
// the line long, and numbers them per spread. The marker （1） stands small at the right of
// the line, its digits upright, and the note opens with its number and a full note-em.
const footnotes = {
  placement: 'spread', // 傍注; 'chapterEnd' sets 後注 after the chapter instead
  numbering: 'spread',
  markerPosition: 'right', markerTemplate: '（{n}）', // written out: 'ja' sets them so
  numberGap: 'em', hangingIndent: em(2), // turnovers clear the number
  fontSize: em(0.8), lineHeight: em(1.5),
  separator: { width: 1 / 3, lineWidth: pt(0.5), color: col('plum') },
};
// Ichiyō's sesame marks (傍点) over ぎつちよんちよん: the mark Japan uses, right of the line.
const cjk = {
  grid: { enabled: true, charsPerLine: CHARS, linesPerPage: LINES },
  emphasisMark: { style: 'sesame', position: 'over' },
};
// #endregion

// #region opener: a title page (扉) on its own, so the story opens on a spread
// Page-anchored design on a vertical page: x runs down the page from its top edge, y across
// it leftwards from its right edge. The title stands on the page's axis, the author lower.
const PT = 25.4 / 72; // mm in a point
const page = (down, across) => ({ anchor: { to: 'page', edge: 'top-left' },
  offset: { x: mm(down), y: mm(across) } });
const TITLE = 26; // pt
// gotcha: headings-drop-h1-break
const story = { level: 1, breakBefore: { enabled: true, parity: 'any' },
  advancedDesign: { enabled: true, minHeight: lines(LINES), slot: { elements: [
    { kind: 'text', id: 'title', content: '{titleText}', fontFamily: MINCHO, fontWeight: 700,
      fontSize: pt(TITLE), lineHeight: 1, letterSpacing: pt(TITLE / 2), color: col('ink'),
      placement: page(42, 127 / 2 - (TITLE * PT) / 2) },
    { kind: 'rule', id: 'rule', direction: 'horizontal', thickness: pt(0.6), color: col('plum'),
      placement: { ...page(42, 127 / 2 + (TITLE * PT) / 2 + 5), size: { width: mm(24) } } },
    { kind: 'text', id: 'author', content: '{author}', fontFamily: MINCHO, fontSize: pt(12),
      letterSpacing: pt(4), color: col('ink'),
      placement: page(118, 127 / 2 + (TITLE * PT) / 2 + 3) },
  ] } } };
const section = { level: 2, fontFamily: MINCHO, fontWeight: 700, fontSize: pt(11),
  lineSpan: 3, indent: em(7) }; // 3行取り, seven characters down, as the Aozora text marks it
// #endregion

// #region furniture: the hashira and kanji folios down the fore-edge
const foreEdge = (id, content, parity, edge, y, pages) => ({
  kind: 'text', id, content, parity, pages, writingMode: 'vertical-rl',
  fontFamily: GOTHIC, fontSize: pt(7), letterSpacing: pt(1), color: col('muted'),
  overflow: 'clip', placement: { anchor: { to: 'outer', edge }, offset: { y: em(y) } },
});
const header = { elements: [
  foreEdge('hashira', '{title}', 'odd', 'top', 2, 'body'),
  foreEdge('folio', '{pageNumber}', 'all', 'bottom', -2, 'body'),
] };
// The title page carries the colophon across the foot, in the edition's language.
const footer = { elements: [{ kind: 'text', id: 'colophon', content: '{attr.colophon}',
  pages: 'opener', fontFamily: GOTHIC, fontSize: pt(5.5), lineHeight: 1.45,
  color: col('muted'), overflow: 'wrap', align: 'center',
  placement: { anchor: { to: 'page', edge: 'bottom' }, offset: { y: mm(-6) },
    size: { width: mm(100) } } }] };
// #endregion

const config = () => ({ // a factory: the engine caches resolved configs per object
  locale: 'ja', // written out, never LANG (gotcha: ja-locale-tag)
  colorPalette,
  page: {
    sizePreset: 'custom', width: mm(127), height: mm(188), dpi: 150, // 四六判
    backgroundColor: col('paper'),
    margins: { top: mm(27), bottom: mm(21), left: mm(13), right: mm(16), mirror: true },
    pageNumbering: { format: 'japanese-informal' },
  },
  layout: { layoutType: 'single', writingMode: 'vertical-rl' },
  cjk,
  footnotes,
  bodyText: {
    fontFamily: MINCHO, fontSize: pt(BODY), lineHeight: pt(LEAD), color: col('ink'),
    boldColor: col('ink'), italicColor: col('ink'), referenceColor: col('ink'),
    textAlign: 'justify', firstLineIndent: em(1), indentAfterHeading: true,
  },
  headings: { fontFamily: MINCHO, color: col('ink'), levels: [story, section] },
  header,
  footer,
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
title: "たけくらべ"
author: "樋口一葉"
---

# たけくらべ {colophon="Higuchi Ichiyō, たけくらべ (Child’s Play, 1895–96), chapter one; the notes are this recipe’s. Text: Aozora Bunko 389, public domain. Set in Shippori Mincho and Noto Sans JP (SIL OFL)."}

## 一

廻れば大門の見返り柳[^1]いと長けれど、お齒ぐろ溝[^2]に{燈火|ともしび}うつる三階[^3]の騷ぎも手に取る如く、明けくれなしの車の{行來|ゆきゝ}にはかり知られぬ全盛をうらなひて、{大音寺前|だいおんじまへ}[^4]と名は佛くさけれど、さりとは陽氣の町と住みたる人の申き、{三嶋神社|みしまさま}の角をまがりてより是れぞと見ゆる{大厦|いへ}もなく、かたぶく軒端の十軒長屋二十軒長や、商ひはかつふつ利かぬ處とて半さしたる雨戸の外に、あやしき{形|なり}に紙を切りなして、胡粉ぬりくり彩色のある{田樂|でんがく}みるやう、裏にはりたる串のさまもをかし、一軒ならず二軒ならず、朝日に干して夕日に仕舞ふ手當こと〴〵しく、一家内これにかゝりて夫れは何ぞと問ふに、知らずや霜月{酉|とり}の日[^5]例の神社に欲深樣のかつぎ給ふ是れぞ熊手の下ごしらへといふ、正月門松とりすつるよりかゝりて、一年うち通しの夫れは誠の商賣人、片手わざにも夏より手足を色どりて、{新年着|はるぎ}の支度もこれをば當てぞかし、南無や大鳥大明神、買ふ人にさへ大福をあたへ給へば製造もとの我等萬倍の利益をと人ごとに言ふめれど、さりとは思ひのほかなるもの、此あたりに大長者のうわさも聞かざりき、住む人の多くは{廓者|くるわもの}にて良人は小格子[^6]の何とやら、下足札そろへてがらんがらんの音もいそがしや夕暮より羽織引かけて立出れば、うしろに切火打かくる女房の顏もこれが見納めか十人ぎりの側杖無理{情死|しんぢう}のしそこね、恨みはかゝる身のはて危ふく、すはと言はゞ命がけの勤めに{遊山|ゆさん}らしく見ゆるもをかし、娘は{大籬|おほまがき}の{下新造|したしんぞ}とやら、七軒の何屋が客廻しとやら、{提燈|かんばん}さげてちよこちよこ走りの修業、卒業して何にかなる、とかくは檜舞臺と見たつるもをかしからずや、垢ぬけのせし三十あまりの年増、小ざつぱりとせし唐棧ぞろひに紺足袋はきて、雪駄ちやら〳〵忙がしげに横抱きの小包はとはでもしるし、茶屋が棧橋とんと沙汰して、廻り遠や此處からあげまする、誂へ物の仕事やさんと此あたりには言ふぞかし、一體の風俗よそと變りて、{女子|おなご}の後帶きちんとせし人少なく、がらを好みて巾廣の卷帶、年増はまだよし、十五六の小癪なるが{酸漿|ほゝづき}ふくんで此{姿|なり}はと目をふさぐ人もあるべし、所がら是非もなや、昨日河岸店に何紫の源氏名耳に殘れど、けふは地廻りの吉と手馴れぬ燒鳥の夜店を出して、身代たゝき骨になれば再び古巣への{内儀|かみさま}姿、どこやら素人よりは見よげに覺えて、これに染まらぬ子供もなし、秋は九月{仁和賀|にわか}[^7]の頃の大路を見給へ、さりとは宜くも學びし{露八|ろはち}が物眞似、{榮喜|えいき}が{處|しよ}作、孟子の母やおどろかん上達の速やかさ、うまいと褒められて今宵も一廻りと生意氣は七つ八つよりつのりて、やがては肩に置手ぬぐひ、鼻歌のそゝり節、十五の少年がませかた恐ろし、學校の唱歌にも:dots[ぎつちよんちよん]{style=sesame}と拍子を取りて、運動會に木やり音頭もなしかねまじき風情、さらでも教育はむづかしきに教師の苦心さこそと思はるゝ{入谷|いりや}ぢかくに育英舍とて、私立なれども生徒の數は千人近く、狹き校舍に目白押の窮屈さも教師が人望いよ〳〵あらはれて、唯學校と一ト口にて此あたりには呑込みのつくほど成るがあり、通ふ子供の數々に或は火消鳶人足、おとつさんは{刎橋|はねばし}の番屋に居るよと習はずして知る其道のかしこさ、梯子のりのまねびにアレ忍びがへしを折りましたと訴へのつべこべ、三百といふ代言の子もあるべし、お前の父さんは馬だねへと言はれて、名のりや{愁|つ}らき子心にも顏あからめるしほらしさ、出入りの{貸座敷|いへ}の祕藏息子寮住居に華族さまを氣取りて、ふさ付き帽子面もちゆたかに洋服かる〴〵と花々敷を、坊ちやん坊ちやんとて此子の追從するもをかし、多くの中に{龍華|りうげ}寺の{信如|しんによ}とて、{千筋|ちすぢ}となづる黒髮も今いく{歳|とせ}のさかりにか、やがては墨染にかへぬべき袖の色、{發心|ほつしん}は腹からか、坊は親ゆづりの勉強ものあり、性來をとなしきを友達いぶせく思ひて、さま〴〵の惡戲をしかけ、猫の死骸を繩にくゝりてお役目なれば{引導|いんだう}をたのみますと投げつけし事も有りしが、それは昔、今は校内一の人とて假にも{侮|あなど}りての處業はなかりき、歳は十五、{並背|なみぜい}にていが栗の{頭髮|つむり}も思ひなしか俗とは變りて、{藤本信如|ふぢもとのぶゆき}と{訓|よみ}にてすませど、何處やら{釋|しやく}といひたげの素振なり。

[^1]: 吉原遊廓の入口、大門へ下る衣紋坂の上の日本堤に立っていた柳。帰りの客がここで名残を惜しんで振り返ったという。

[^2]: 遊廓のまわりをめぐる堀。遊女が逃げ出さないように掘られたもので、水が黒く濁っていたのでこう呼ばれた。

[^3]: 廓の中に建ち並ぶ三階建ての大きな妓楼。

[^4]: 吉原の裏手、下谷龍泉寺町のあたりの通称。大音寺の門前にあたる。

[^5]: 十一月の酉の日に鷲（おおとり）神社で開かれる酉の市。縁起物の熊手が売られる。

[^6]: 格の低い、小さな遊女屋。

[^7]: 吉原で秋に催された俄（にわか）。芸者や幇間が茶番や踊りを見せて廓の中を練り歩いた。
`; // content.<lang>.md: the same Japanese text in both

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = {
  'Shippori Mincho': ['400', '700'], // the text and the notes; the title and 一
  'Noto Sans JP': ['400'], // the hashira, the folios and the colophon
};

// ─── 4 · Build & show ───────────────────────────────────────────────────────
const title = markdown.match(/^title: "(.*)"$/m)[1];
const author = markdown.match(/^author: "(.*)"$/m)[1];
await loadFonts(FONTS, markdown); // the Latin files: the colophon
// The notes' （1） and their upright digits come from the text face too.
await loadCjkFonts({ [MINCHO]: ['400'] }, `${markdown}（）0123456789`, { vertical: true });
await loadCjkFonts({ [MINCHO]: ['700'] }, `${title}${author}一`);
await loadCjkFonts({ [GOTHIC]: ['400'] },
  `${title}${markdown.match(/colophon="([^"]*)"/)[1]}一二三四五六七八九十`, { vertical: true });
const doc = await buildWithFonts(() => buildDocument({ markdown }, config()), markdown);
showBook(doc, { title: t({ en: 'Notes beside a vertical Japanese text, across the spread',
  es: 'Notas junto a un texto japonés vertical, en la doble página' }) });
offerPdf(() => renderToPdf(doc, { fontProvider: cjkPdfProvider }), `${RECIPE}.pdf`);

// ─── 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 · 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 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.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()));
  }));
}

/** 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. Latin comes first: postext-pdf draws a character from the first
 *  file that has it, as the browser takes a character both files hold from
 *  latin. 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 = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${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)]);
  return ext ? [latin, ext] : 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;
}

// ─── /Kit ───────────────────────────────────────────────────────────────────────
```

## 变化

### 把注释集中在章末

不设`placement`时，竖排的`ja`书把注释排成后注（後注，kōchū）：放在本章正文之后，上面是同样的线，全章连续编号。在这里它们占满第4页的左半。

```diff
-  placement: 'spread', // 傍注; 'chapterEnd' sets 後注 after the chapter instead
-  numbering: 'spread',
+  placement: 'chapterEnd', // 後注, the default for a vertical ja book
+  numbering: 'chapter',
```

### 把编号放在词语旁边

`markerPosition: 'side'`把一个更小的编号放在行旁的空隙里，就像行间注音那样，所以它在行内不占任何位置。

```diff
-  markerPosition: 'right', markerTemplate: '（{n}）', // written out: 'ja' sets them so
+  markerPosition: 'side', markerTemplate: '{n}',
```

## 常见问题

- **日文文本标记为'ja'，不要用zh-Hans或LANG.** 食谱的版本是en和es，但日文示例在两个版本里都是日文：`locale: LANG`会把它标记为英文或西班牙文，中文标记则会按中文规则排它（开明式标点、小假名可以出现在行首、图代替図、PDF中用中文字形）。写'ja'：它选用日本地区（JLReq断行和标点、芝麻着重号、振假名的分布、図和表标签），并关闭断词。lint会让带假名却标记为zh或ko的文本失败。
- **传入任何headings对象都会关掉H1换页.** 默认情况下，H1换页到右页（always-odd），但只要传入headings对象，这个默认值就会被重置，于是各章接排，span: 'page'也不起作用。在每份配置中重新写明headings.levels[0].breakBefore: { enabled: true, parity }。
- **中文字体通过cjk块分片加载.** Fontsource把一个中文、日文或韩文字体家族按每个字重约一百个文件提供，每个文件覆盖一段字符范围。loadFonts只获取latin文件，所以屏幕上的汉字来自系统字体，测量不准；fontsourceProvider交给PDF的也是这个latin文件，汉字印出来是空框。列出kit中的cjk块，在loadFonts之后调用loadCjkFonts(FONTS, markdown)（书中用到几种CJK字体时，每种字体调用一次，并传入它所排的文字），并给renderToPdf传fontProvider: cjkPdfProvider：两者都会取用包含文中字符的那些文件。
- **右装订的书用showBook显示跨页.** 在右装订的书中（阿拉伯文、希伯来文或波斯文，竖排中文，或page.binding 'right'），第1页仍是奇数页（recto），但它位于书脊左侧，跨页读作[3 | 2]。showPages把所有书都按左装订排列；book块中的showBook（cjk块中也有同一个函数）读取doc.binding，把跨页左右镜像。capture.hero仍按阅读顺序[偶数页, 奇数页]指定跨页：[2, 3]。

## 致谢

- 食谱: Ignacio Ferro ([@drnachio](https://github.com/drnachio))
- 文字: 樋口一葉「たけくらべ」 (Child’s Play, 1895–96), chapter one; Aozora Bunko card 389, from 「日本現代文學全集10　樋口一葉集」 (Kōdansha, 1962), input 青空文庫, proofreading 米田進 and 小林繁雄, converted with aozora.py; the seven notes were written for this recipe (CC BY 4.0): Higuchi Ichiyō; Aozora Bunko volunteers ([来源](https://www.aozora.gr.jp/cards/000064/card389.html)), 公有领域
- 字体: Shippori Mincho (OFL-1.1), Noto Sans JP (OFL-1.1)
- 代码: MIT · 示例内容: CC-BY-4.0

## 相关食谱

- [No. 071 · 脚注排在引用它的那一栏底部](https://postext.dev/zh/cookbook/novel-footnotes-column-foot.md): Markdown的[^id]标记变成编号注释，排在引用它的那一栏底部；另有开关可切换为单栏、章末注和连续编号。 · 难度 2 (中级) · 小说、戏剧与文学散文
- [No. 091 · 竖排中文：引文排成行内夹注](https://postext.dev/zh/cookbook/vertical-book-with-jiazhu-citations.md): 一章繁体竖排、右翻的书稿，按GB/T 7714注释体引用的文献排成正文行内的双行夹注。 · 难度 3 (高级) · 任意类型
- [No. 020 · 单独成页的双栏尾注](https://postext.dev/zh/cookbook/endnotes-instead-of-footnotes.md): 一个简短的预处理程序给[^1]注释编号，把它们集中到Notes标题下，标题样式让它们单独成页、分两栏排。 · 难度 2 (中级) · 论文与学术出版物