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1639 lines (1509 loc) · 71.3 KB
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// Phase 3 of tbdocs: render each page's markdown / HTML body to an HTML
// fragment stored on page.renderedContent. See builder/PLAN-3.md for the
// full spec.
//
// What this phase does NOT do (per PLAN-3 §3):
// - wrap in <html> / layout / sidebar / footer / scripts (Phase 4)
// - inject <a class="anchor-heading"> next to <hN id> (Phase 4 -- has
// to see auto-generated heading IDs)
// - compress whitespace (Phase 4)
// - generate the per-page nav-activation <style> block (Phase 4)
// - concatenate chapter bodies for the PDF book (Phase 8)
import MarkdownIt from "markdown-it";
import attrs from "markdown-it-attrs";
import deflist from "markdown-it-deflist";
import footnote from "markdown-it-footnote";
import { initHighlighter } from "./highlight.mjs";
export async function renderPhase(pages, site, staticFiles = []) {
// Allow the orchestrator to pre-build the markdown-it instance (so
// Phase 2's seo.mjs can share the same renderer). Idempotent: if
// site.markdown is already set, use it; otherwise build it here.
let md = site.markdown;
if (!md) {
const highlighter = await initHighlighter();
const linkTables = buildLinkTables(pages);
const baseurl = String(site.config.baseurl || "");
const staticFileSet = new Set(staticFiles.map((s) => s.srcRel));
md = createMarkdownIt({ highlighter, linkTables, baseurl, staticFiles: staticFileSet });
site.markdown = md;
}
await Promise.all(pages.map(async (page) => {
page.renderedContent = renderPage(page, md);
}));
}
function renderPage(page, md) {
if (page.ext === ".html") {
// 404.html passes through Phase 4's default-layout wrap; book.html is
// consumed by Phase 8. Either way, no markdown rendering happens here.
return page.rawContent;
}
// CommonMark normalises CRLF/CR to LF before block parsing. The
// pre-render rewrites below all rely on LF-only input -- do the
// normalisation up front so they see consistent line shapes.
let source = page.rawContent.replace(/\r\n?/g, "\n");
source = stripLiquidRawTags(source);
source = rewriteTripleAsteriskEmphasis(source);
source = encodeSpacesInMediaUrls(source);
source = rewriteListItemSetextHeadings(source);
source = absorbTrailingHtmlComments(source);
source = rewriteAdmonitions(source);
let html = md.render(source, { page });
html = normaliseVoidTags(html);
html = padEmptyCells(html);
return html;
}
// kramdown emits a single space inside otherwise-empty `<td>` / `<th>`
// cells (`<td> </td>`); markdown-it leaves them collapsed (`<td></td>`).
function padEmptyCells(html) {
// kramdown emits `<td>\xa0</td>` (nbsp) for empty cells; we mirror
// it so the rendered HTML byte-matches. Regular space here would
// visually look the same, but Phase 4's compress would later
// collapse it differently than kramdown's empty-cell content.
return html.replace(/<(t[dh])([^>]*)><\/\1>/g, "<$1$2> </$1>");
}
// Jekyll's Liquid renderer strips `{% raw %}` / `{% endraw %}` tags
// before kramdown sees the source; markdown-it does not understand
// Liquid, so the tags survive into the rendered HTML. Strip them so
// the same content reaches the markdown parser as kramdown sees.
const LIQUID_RAW_RE = /\{%\s*(?:end)?raw\s*%\}/g;
function stripLiquidRawTags(src) {
return src.replace(LIQUID_RAW_RE, "");
}
// kramdown accepts unescaped spaces inside `` and `[text](url)`
// URLs; CommonMark / markdown-it does NOT and leaves the source text
// unparsed. URL-encode spaces inside image and link URL components so
// markdown-it can parse them the way kramdown would.
//
// Only the simple case is handled: a URL that's a plain file path with
// spaces and NO embedded quotes or parens. Anything trickier (titles,
// nested parens) gets left alone -- the regex is too coarse to safely
// rewrite those.
const MEDIA_URL_SPACES_RE = /(!?\[(?:[^\]\n]*)\])\(([^)"'\n]+)\)/g;
function encodeSpacesInMediaUrls(src) {
return src.replace(MEDIA_URL_SPACES_RE, (whole, prefix, url) => {
if (!/ /.test(url)) return whole;
return `${prefix}(${url.replace(/ /g, "%20")})`;
});
}
// kramdown emits `***text***` as `<strong><em>text</em></strong>`;
// markdown-it emits the same source as `<em><strong>text</strong></em>`.
// Pre-rewriting the source to `**_text_**` makes both renderers emit
// the strong-outside form. Leave existing `**_..._**` and `_**...**_`
// patterns alone so their em/strong order matches the source intent.
const TRIPLE_STAR_RE = /\*\*\*([^*\n][^*\n]*?)\*\*\*/g;
function rewriteTripleAsteriskEmphasis(src) {
return src.replace(TRIPLE_STAR_RE, "**_$1_**");
}
// kramdown attaches a standalone HTML-comment line to the preceding
// paragraph (the comment line ends up inside the paragraph's AST). In
// CommonMark / markdown-it, a comment that occupies a whole line is
// detected as a block-level HTML element and the preceding paragraph is
// closed before it. Pre-rewrite the source so a comment line that
// immediately follows a non-blank "regular text" line and is itself
// followed by a blank line is JOINED to the preceding line. markdown-it
// then treats the `<!-- ... -->` as inline raw HTML inside the same
// paragraph, matching kramdown.
//
// Conservative: skip if the previous line is a fence, heading, list
// marker, blockquote marker, or HTML-block opener -- those don't form
// the kind of paragraph kramdown would absorb the comment into.
const HTML_COMMENT_LINE_RE = /^[ \t]*<!--[^\n]*-->[ \t]*$/;
const PARAGRAPH_CONTINUATION_RE = /^[ \t]*[^\s#>*+\-`~|<\[].*$/;
function absorbTrailingHtmlComments(src) {
const lines = src.split("\n");
const out = [];
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
if (
i > 0
&& HTML_COMMENT_LINE_RE.test(line)
&& PARAGRAPH_CONTINUATION_RE.test(lines[i - 1])
&& (i + 1 >= lines.length || lines[i + 1].trim() === "")
) {
// Append to the previous emitted line with a single space.
out[out.length - 1] = `${out[out.length - 1]} ${line.trim()}`;
} else {
out.push(line);
}
}
return out.join("\n");
}
// kramdown quirk: when `---` appears on a line directly after a list item,
// it treats the previous list item's content as a setext H2 INSIDE the
// <li>, and the `---` does NOT terminate the list. markdown-it instead
// reads `---` as <hr> after the list. Rewrite the source to make the
// promoted item explicit: `- text\n---\n` becomes `- ## text\n` so
// markdown-it emits an <li><h2>text</h2></li> at that position.
const LIST_ITEM_SETEXT_RE = /^([ \t]*[*+\-][ \t]+)([^\n]*?)\n[ \t]*---[ \t]*$/gm;
function rewriteListItemSetextHeadings(src) {
return src.replace(LIST_ITEM_SETEXT_RE, (_, marker, text) => `${marker}## ${text}`);
}
// markdown-it inline newline rule, modified to keep all-but-the-final-
// two trailing spaces in the pending text. Matches kramdown's behaviour
// (the line-break regex `( )(?=\n)` consumes exactly the final two
// spaces). Otherwise identical to the upstream rule.
function kramdownHardBreakNewline(state, silent) {
let pos = state.pos;
if (state.src.charCodeAt(pos) !== 0x0A) return false;
const pmax = state.pending.length - 1;
const max = state.posMax;
if (!silent) {
if (pmax >= 0 && state.pending.charCodeAt(pmax) === 0x20) {
if (pmax >= 1 && state.pending.charCodeAt(pmax - 1) === 0x20) {
// Two-or-more trailing spaces -> hardbreak. Strip only the final
// two; preserve any additional trailing spaces in the text.
state.pending = state.pending.slice(0, pmax - 1);
state.push("hardbreak", "br", 0);
} else {
state.pending = state.pending.slice(0, -1);
state.push("softbreak", "br", 0);
}
} else {
state.push("softbreak", "br", 0);
}
}
pos++;
while (pos < max && state.src.charCodeAt(pos) === 0x20) pos++;
while (pos < max && state.src.charCodeAt(pos) === 0x09) pos++;
state.pos = pos;
return true;
}
// kramdown normalises HTML void elements to the XHTML self-closing form
// (`<br />`, `<hr />`, `<img ... />`) regardless of the input shape.
// markdown-it with `xhtmlOut: true` emits the same form for tokens it
// generates, but raw block / inline HTML (like author-written `<br>`)
// passes through verbatim. Rewrite those to match.
const VOID_TAGS_RE = /<(br|hr|img|input|link|meta|area|base|col|embed|source|track|wbr)((?:\s+[^>/]+(?:="[^"]*"|='[^']*')?)*)\s*\/?>/gi;
function normaliseVoidTags(html) {
return html.replace(VOID_TAGS_RE, (_, tag, attrs) => `<${tag.toLowerCase()}${attrs} />`);
}
// ---------- markdown-it configuration ---------------------------------------
export { initHighlighter };
export function createMarkdownIt(ctx) {
const md = new MarkdownIt({
// kramdown parse_block_html + parse_span_html; recursion handled by
// blockHtmlRecursionPlugin (PLAN-3 §5.12).
html: true,
// kramdown emits self-closing <br /> / <hr /> (XHTML form); CommonMark
// default is HTML5 <br>. Match kramdown.
xhtmlOut: true,
// kramdown hard_wrap is OFF on this site -- single newlines are not
// <br>. Two-space line breaks still produce <br> via CommonMark.
breaks: false,
// Site content uses explicit [text](url) form; no bare URLs in body
// prose. Off matches current rendered output.
linkify: false,
// -- -> en-dash, --- -> em-dash, ASCII quotes -> curly. Matches
// kramdown smart_quotes; see PLAN-3 §5.9 for divergences.
typographer: true,
quotes: "“”‘’",
highlight: ctx.highlighter ? (code, lang) => ctx.highlighter.render(code, lang) : undefined,
});
// Override the fence renderer so our highlight callback's wrapper HTML
// (which starts with <div, not <pre>) is used verbatim. Without this,
// markdown-it's default fence rule wraps it in another <pre><code>.
//
// When the fence is nested (inside a list item, admonition, or other
// block container), kramdown inserts a newline between the inner
// `</div>` and the outer `</div>` of the wrapper as part of its
// indented-block pretty-printing -- the html-compress pass then
// renders that as a single space. Mirror by splicing a `\n` between
// the close tags when level > 0.
md.renderer.rules.fence = (tokens, idx, options) => {
const tok = tokens[idx];
const lang = tok.info ? tok.info.trim().split(/\s+/)[0] : "";
const html = options.highlight(tok.content, lang);
if (tok.level > 0 || tok.meta?.nestedInBlock) {
return html.replace(/<\/div><\/div>$/, "</div>\n</div>") + "\n";
}
return html + "\n";
};
// Indented (4-space) code blocks have no language info. kramdown wraps
// them in the same Rouge wrapper shape used for fences with a
// `language-plaintext` class. markdown-it's default emits a bare
// `<pre><code>` -- override to match.
md.renderer.rules.code_block = (tokens, idx, _opts, _env, _slf) => {
const tok = tokens[idx];
const body = escapeHtmlMinimal(tok.content);
return `<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>${body}</code></pre></div></div>\n`;
};
// kramdown/just-the-docs tag inline `code` spans with the Rouge wrapper
// class so the same CSS rules style both block-level highlights and
// inline ones. Match that, and escape only `& < >` (matching kramdown's
// code-span escape) -- leaving `"` and `'` literal so embedded HTML
// attribute syntax stays readable.
md.renderer.rules.code_inline = (tokens, idx, _opts, _env, slf) => {
const tok = tokens[idx];
return `<code class="language-plaintext highlighter-rouge"${slf.renderAttrs(tok)}>${escapeHtmlMinimal(tok.content)}</code>`;
};
// just-the-docs wraps every <table> in <div class="table-wrapper"> via
// its `_includes/table_wrappers.html` Liquid pass. Mirror that here so
// CSS rules keyed on `.table-wrapper > table` keep working. Use the
// default renderToken first so markdown-it's per-token block-prefix
// whitespace handling still produces the leading newline when the
// table sits at the start of a list-item / dd / blockquote child.
md.renderer.rules.table_open = (tokens, idx, opts, _env, slf) =>
slf.renderToken(tokens, idx, opts).replace(/<table>/, `<div class="table-wrapper"><table>`);
md.renderer.rules.table_close = (tokens, idx, opts, _env, slf) =>
`</table></div>` + slf.renderToken(tokens, idx, opts).replace(/<\/table>/, "");
// kramdown emits `style="text-align: left"` with a space after the
// colon; markdown-it emits the compact form. Override the th/td
// renderers to widen the gap.
const styleSpace = (defaultRule) => (tokens, idx, opts, env, slf) => {
const tok = tokens[idx];
const styleIdx = tok.attrIndex("style");
if (styleIdx >= 0) {
tok.attrs[styleIdx][1] = tok.attrs[styleIdx][1].replace(/:/g, ": ");
}
return slf.renderToken(tokens, idx, opts);
};
md.renderer.rules.th_open = styleSpace();
md.renderer.rules.td_open = styleSpace();
// kramdown renders ordered lists with no `start` attribute even when
// the source numbers don't begin at 1 (it ignores the source
// numbering entirely). markdown-it preserves it; strip to match.
md.renderer.rules.ordered_list_open = (tokens, idx, _opts, _env, slf) => {
const tok = tokens[idx];
const startIdx = tok.attrIndex("start");
if (startIdx >= 0) tok.attrs.splice(startIdx, 1);
return slf.renderToken(tokens, idx, slf.options);
};
// Override the inline newline rule to match kramdown's hard-break
// semantics. kramdown's regex `( )(?=\n)` consumes EXACTLY the two
// spaces immediately before the newline -- any additional trailing
// spaces are preserved in the text. markdown-it's default rule strips
// ALL trailing spaces before emitting the hardbreak. For 2-space hard
// breaks (the common case) both behaviours are identical; the
// divergence shows up with 3+ trailing spaces, where Jekyll renders
// `text <br />` (one trailing space) and we render `text<br />`.
md.inline.ruler.at("newline", kramdownHardBreakNewline);
// kramdown's `{: ... }` attribute syntax. Default plugin delimiters
// are `{` / `}`; we override both to require the colon.
md.use(attrs, {
leftDelimiter: "{:",
rightDelimiter: "}",
});
md.use(standaloneIalForwardPlugin);
md.use(tightLooseListPlugin);
md.use(deflist);
md.use(looseDeflistPlugin);
md.use(footnote);
configureFootnotes(md);
md.use(headerIdPlugin);
md.use(tocPlugin);
md.use(relativeLinksPlugin, ctx);
md.use(blockHtmlRecursionPlugin);
md.use(kramdownDashesPlugin);
md.use(kramdownEllipsisPlugin);
md.use(flattenAdjacentStrongPlugin);
md.use(svgInlinePlugin, ctx);
return md;
}
// kramdown pairs adjacent `**` markers left-to-right (1st with 2nd,
// 3rd with 4th, ...). markdown-it follows CommonMark's emphasis rule,
// which prefers nesting when intermediate `**` markers can both open
// and close (e.g. `**X"**Y**"Z**` -> outer strong wrapping an inner
// strong). Detect the depth-2 nested-strong-with-text shape and
// flatten it back to two sibling strongs with the inner content as
// plain text between them.
function flattenAdjacentStrongPlugin(md) {
md.core.ruler.after("inline", "flatten-adjacent-strong", (state) => {
walkInlineChildren(state.tokens, (children) => {
let i = 0;
while (i < children.length) {
// Pattern (level L):
// [i ] strong_open (level L)
// [i+1] text (level L+1) -- non-empty, "outer-left"
// [i+2] strong_open (level L+1)
// [i+3] text (level L+2) -- "inner"
// [i+4] strong_close (level L+1)
// [i+5] text (level L+1) -- non-empty, "outer-right"
// [i+6] strong_close (level L)
const t0 = children[i];
if (t0 && t0.type === "strong_open"
&& children[i + 1]?.type === "text"
&& children[i + 2]?.type === "strong_open"
&& children[i + 3]?.type === "text"
&& children[i + 4]?.type === "strong_close"
&& children[i + 5]?.type === "text"
&& children[i + 6]?.type === "strong_close"
&& children[i + 2].markup === t0.markup
&& children[i + 4].markup === t0.markup
&& children[i + 6].markup === t0.markup) {
// Repair the nesting:
// inner strong_open -> outer strong_close
// inner strong_close -> outer strong_open
// Level of each remaining content drops by one (was inside
// the outer-then-inner stack, now only one deep at most).
const innerOpen = children[i + 2];
const innerClose = children[i + 4];
const baseLevel = t0.level;
innerOpen.type = "strong_close";
innerOpen.tag = "strong";
innerOpen.nesting = -1;
innerOpen.level = baseLevel;
innerClose.type = "strong_open";
innerClose.tag = "strong";
innerClose.nesting = 1;
innerClose.level = baseLevel;
// Plain-text middle is now at level baseLevel.
children[i + 3].level = baseLevel;
// Outer-left / outer-right texts retain their levels (still
// inside a strong each).
// No re-numbering of subsequent tokens needed -- levels are
// only used by the renderer for indentation and our other
// post-passes; the outer strong_close at i+6 is already at
// baseLevel.
i += 7;
continue;
}
i++;
}
});
});
}
// markdown-it's `replacements` core rule collapses every run of 2+ dots
// (`.{2,}`) to a single ellipsis `…`. kramdown is stricter: it converts
// exactly THREE consecutive dots to `…` and leaves any extra dots as
// plain dots. The two behaviours diverge on `....`, `.....`, etc.:
// kramdown writes `….`, `…..`, ...; markdown-it writes `…`, `…`, ....
// Walk text tokens after typographer has run; for each contiguous run of
// `…` immediately following a word/punctuation char (i.e. not in
// `?…` / `!…` patterns the upstream regex already special-cases),
// recover the missing dots if the source had >3 dots in a row.
function kramdownEllipsisPlugin(md) {
md.core.ruler.after("replacements", "kramdown-ellipsis", (state) => {
// The replacements rule has already collapsed `.{2,}` -> `…` (with
// `?…` / `!…` -> `?..` / `!..` exceptions). We can't recover the
// pre-collapse count from the token alone -- examine the inline
// token's source content, count consecutive dots in the source, and
// pad the rendered `…` with N-3 trailing dots when N > 3.
for (const blk of state.tokens) {
if (blk.type !== "inline" || !blk.children) continue;
const src = blk.content;
if (!/\.{4,}/.test(src)) continue;
// Walk text children left-to-right tracking source position by
// counting characters consumed. For each `…` we encounter in the
// text content, peek the source string to count how many dots
// were originally there.
let srcPos = 0;
for (const t of blk.children) {
if (t.type !== "text" || !t.content) continue;
let out = "";
for (let i = 0; i < t.content.length; i++) {
const ch = t.content[i];
if (ch === "…") {
// Find the matching dot run starting at or near srcPos.
const m = src.slice(srcPos).match(/^[^.…]*\.{3,}/);
const dotCount = m ? m[0].match(/\.+$/)[0].length : 3;
out += "…";
for (let k = 3; k < dotCount; k++) out += ".";
srcPos += (m ? m[0].length : 3);
} else if (ch === "—" || ch === "–") {
out += ch;
// skip 2-3 source chars for en/em-dash conversions
const skip = src.startsWith("---", srcPos) ? 3 : (src.startsWith("--", srcPos) ? 2 : 1);
srcPos += skip;
} else {
out += ch;
srcPos++;
}
}
t.content = out;
}
}
});
}
// ---------- kramdown-style smart dashes -------------------------------------
//
// markdown-it's typographer converts `--` -> en-dash only when neither
// side is whitespace ("word--word"). kramdown converts unconditionally:
// `word-- word` -> `word– word`. Run a small pass over inline text
// tokens after markdown-it's typographer has finished, replacing the
// remaining `---` with em-dash and `--` with en-dash. text tokens
// inside code spans and code blocks are separate token types
// (code_inline / code_block / fence), so they're untouched.
function kramdownDashesPlugin(md) {
md.core.ruler.after("replacements", "kramdown-dashes", (state) => {
walkTokens(state.tokens, (t) => {
if (t.type !== "text") return;
if (t.content.includes("--")) {
t.content = t.content.replace(/---/g, "—").replace(/--/g, "–");
}
// kramdown's smart_quotes also converts `<<` and `>>` to
// left/right guillemets (« / »). markdown-it's typographer
// doesn't, so do it here. Same `text`-token-only restriction
// keeps code spans and code blocks untouched.
if (t.content.includes("<<")) t.content = t.content.replace(/<<(?!=)/g, "«").replace(/<<=/g, "«=");
if (t.content.includes(">>")) t.content = t.content.replace(/>>(?!=)/g, "»").replace(/>>=/g, "»=");
});
});
// kramdown converts a straight ASCII `'` to a right-curly `’` whenever
// it follows non-whitespace and precedes a word character -- so
// `C/C++'s typedef` becomes `C/C++’s typedef`. markdown-it's
// smartquotes rule is stricter (requires word-char on both sides), so
// possessive apostrophes after punctuation stay straight. Run a
// post-smartquotes sweep on text tokens to fix the gap.
md.core.ruler.after("smartquotes", "kramdown-possessive", (state) => {
walkTokens(state.tokens, (t) => {
if (t.type !== "text") return;
if (!t.content.includes("'")) return;
t.content = t.content.replace(/(\S)'(?=\w)/g, "$1’");
});
});
// Kramdown's smart_quotes parser operates on the raw source string,
// so quotes adjacent to emphasis markers (`**"foo"**`) end up curled
// via rules that markdown-it's typographer (which operates on parsed
// text tokens, blind to siblings) can't reach. The result: Jekyll
// renders `<strong>"foo"</strong>` while we emit `<strong>"foo"</strong>`.
//
// Translate kramdown's two relevant patterns into token-stream rules:
//
// * Text ending with `"` / `'` followed by strong_close or em_close
// (`**...X"**`). Source scanner is positioned at X (the char before
// the quote, in the same text); rule 6 `(SQ_CLOSE)(quote)` fires
// when X is in SQ_CLOSE = `[^ \\\t\r\n\[{(-]`, otherwise rule 9
// catchall renders it as the opening curly form. Mirror: rdquo /
// rsquo if X is a "closing-friendly" char, ldquo / lsquo otherwise.
//
// * Text starting with `"` / `'` preceded by strong_open or em_open
// (`**"X...**`). Source scanner is positioned at the quote (the
// `**` was already consumed). Rules in order:
// - rule 1 (rquote1, SQ_PUNCT lookahead) -> rdquo if next char
// in same text is one of [!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~].
// - rule 7 (rquote1, \s|s\b|$ lookahead) -> rdquo if next char
// is whitespace, `s` at word boundary, or end of content.
// - else falls through to rule 9 catchall -> ldquo.
md.core.ruler.after("smartquotes", "kramdown-quote-near-emphasis", (state) => {
walkInlineChildren(state.tokens, (children) => {
for (let i = 0; i < children.length; i++) {
const t = children[i];
if (t.type !== "text" || !t.content) continue;
const last = t.content[t.content.length - 1];
if ((last === '"' || last === "'") && isEmphasisClose(children[i + 1])) {
// Char before the quote, in the same text token.
const charBefore = t.content.length >= 2 ? t.content[t.content.length - 2] : "";
const closing = !SQ_CLOSE_EXCLUDED.has(charBefore) && charBefore !== "";
if (closing) {
t.content = t.content.slice(0, -1) + (last === '"' ? "”" : "’");
} else {
t.content = t.content.slice(0, -1) + (last === '"' ? "“" : "‘");
}
}
const first = t.content[0];
if ((first === '"' || first === "'") && isEmphasisOpen(children[i - 1])) {
const charAfter = t.content.length >= 2 ? t.content[1] : "";
let closing = false;
if (charAfter === "") closing = true; // rule 7 EOL branch
else if (SQ_PUNCT_RE.test(charAfter)) closing = true; // rule 1
else if (/\s/.test(charAfter)) closing = true; // rule 7 \s branch
if (closing) {
t.content = (first === '"' ? "”" : "’") + t.content.slice(1);
} else {
t.content = (first === '"' ? "“" : "‘") + t.content.slice(1);
}
}
// Text starting with a quote whose previous sibling is an
// emphasis CLOSE (e.g. `*foo*'th` or `**foo**'s`). markdown-it
// already curls this as `’` / `”` (closing). kramdown's
// scanner at this position runs the same rule cascade as text
// after emphasis_open above:
// - rule 1 (next char SQ_PUNCT) -> closing
// - rule 7 EOL / `\s` / `s\b` lookahead -> closing
// - else (word char follows, not `s\b`) -> rule 9 -> opening
// The `s\b` branch of rule 7 fires for the apostrophe-s
// possessive (`*foo*'s`), keeping it closing. Other word
// characters fall through to rule 9 and flip to opening.
if ((first === "’" || first === "”") && isEmphasisClose(children[i - 1])) {
const charAfter = t.content.length >= 2 ? t.content[1] : "";
const charAfter2 = t.content.length >= 3 ? t.content[2] : "";
let closing = false;
if (charAfter === "") closing = true;
else if (SQ_PUNCT_RE.test(charAfter)) closing = true;
else if (/\s/.test(charAfter)) closing = true;
else if (first === "’" && charAfter === "s" && !/\w/.test(charAfter2)) closing = true;
if (!closing) {
t.content = (first === "’" ? "‘" : "“") + t.content.slice(1);
}
}
}
});
});
}
// kramdown's SQ_CLOSE = `[^ \\\t\r\n\[{(-]`: characters that, when they
// appear just before a quote, mark that quote as "closing" via rule 6.
// Encode the EXCLUDED set so a positive lookup gives us the inverse.
const SQ_CLOSE_EXCLUDED = new Set([" ", "\\", "\t", "\r", "\n", "[", "{", "(", "-"]);
// kramdown's SQ_PUNCT character class.
const SQ_PUNCT_RE = /[!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~]/;
// Any straight or curly quote character.
const QUOTE_ANY_RE = /["'“”‘’]/;
// Apply kramdown-style smart-quote conversion to a raw HTML body --
// used for content inside `<summary markdown=span>...</summary>` and
// similar inline elements where kramdown's HTML parser descends and
// applies inline conversions. Implements the same SQ_RULES cascade
// (rules 1, 6, 7, 9) on the raw text outside of nested tags:
// - `<context-char>"` -> rdquo (rule 6: SQ_CLOSE before quote)
// - `"<word-like>` -> rdquo via rule 7 (s\b) or fall to ldquo
// Conservative scan -- only converts straight `'` / `"` that look like
// English text quotes; leaves HTML attribute quotes alone by skipping
// content inside `<...>` brackets.
function applyKramdownSmartQuotes(body) {
if (!/['"]/.test(body)) return body;
// Walk char-by-char, skipping anything between `<` and `>` (inline
// tags) and any HTML entity. Track "previous visible char" so we can
// decide whether each `'` / `"` is opening or closing.
let out = "";
let i = 0;
let prev = ""; // last non-tag char emitted (or "" at start)
while (i < body.length) {
const ch = body[i];
if (ch === "<") {
const end = body.indexOf(">", i);
if (end < 0) { out += body.slice(i); break; }
out += body.slice(i, end + 1);
i = end + 1;
prev = ">";
continue;
}
if (ch === "'" || ch === '"') {
const next = body[i + 1] || "";
const isDouble = ch === '"';
// Rule 1 (kramdown SQ rule 126): quote followed by SQ_PUNCT -> rquote.
// Rule 7 (rule 139): quote followed by whitespace / `s\b` / EOL -> rquote.
// Rule 6 (rule 137): SQ_CLOSE before quote -> rquote.
// Default fall-through: ldquo.
const closingByPunct = SQ_PUNCT_RE.test(next);
const closingByWS = /\s/.test(next) || next === "";
const closingByS = !isDouble && next === "s" && !/\w/.test(body[i + 2] || "");
const closingByPrev = prev !== "" && !SQ_CLOSE_EXCLUDED.has(prev);
const closing = closingByPunct || closingByWS || closingByS || closingByPrev;
out += closing ? (isDouble ? "”" : "’") : (isDouble ? "“" : "‘");
prev = ch;
i++;
continue;
}
out += ch;
prev = ch;
i++;
}
return out;
}
function isEmphasisOpen(tok) {
return tok && (tok.type === "strong_open" || tok.type === "em_open");
}
function isEmphasisClose(tok) {
// Treat `code_inline` like an emphasis_close for smart-quote purposes:
// kramdown's source-position scanner sees `\`...\`'word` the same as
// `*...*'word` -- the backtick is consumed first, scanner lands AT
// the quote, and the same rule cascade fires.
return tok && (tok.type === "strong_close" || tok.type === "em_close" || tok.type === "code_inline");
}
// Walk inline-token children arrays so a visitor can examine adjacent
// siblings. The plain walkTokens helper recurses but only sees one token
// at a time -- this variant invokes the visitor once per inline token's
// children array (the level at which siblings live).
function walkInlineChildren(tokens, visit) {
for (const t of tokens) {
if (t.type === "inline" && Array.isArray(t.children)) {
visit(t.children);
}
}
}
// ---------- standalone IAL forward attachment -------------------------------
//
// kramdown rule: a standalone block IAL (an IAL that takes up an entire
// paragraph) attaches to the FOLLOWING block, not the preceding one.
// markdown-it-attrs attaches them to the paragraph itself, leaving the
// paragraph's inline children empty. Detect that, move the attrs to the
// next block-level token, and splice out the now-empty paragraph triplet.
function standaloneIalForwardPlugin(md) {
// kramdown's standalone-IAL attachment is direction-sensitive:
// - IAL adjacent to the previous block (no blank line between)
// attaches BACKWARD to that block.
// - IAL separated by a blank line attaches FORWARD to the next
// block.
// markdown-it-attrs always parses the IAL as its own paragraph and
// sets the attrs on it -- losing both behaviours. Detect the
// standalone shape (paragraph whose inline content was entirely
// consumed as attrs) and re-target the attrs onto the right
// neighbour using token.map to look up the source-line gap.
md.core.ruler.after("curly_attributes", "standalone-ial-attach", (state) => {
const srcLines = state.src.split("\n");
const toks = state.tokens;
// Lines previously occupied by a now-removed standalone IAL --
// counts as "non-blank" when checking adjacency for a following
// IAL (so multiple consecutive IALs all attach to the same
// preceding block, as kramdown does).
const consumedLines = new Set();
for (let i = 0; i < toks.length; i++) {
const open = toks[i];
if (open.type !== "paragraph_open") continue;
if (!open.attrs || open.attrs.length === 0) continue;
const inline = toks[i + 1];
if (inline?.type !== "inline") continue;
const hasVisibleContent = (inline.children || []).some(
(c) => c.type !== "text" || c.content !== "",
);
if (hasVisibleContent) continue;
const close = toks[i + 2];
if (close?.type !== "paragraph_close") continue;
const prev = toks[i - 1];
const next = toks[i + 3];
let target = null;
if (prev && isHeadingOrParagraphClose(prev)) {
const prevOpen = findBlockOpenFor(toks, i - 1);
if (prevOpen && ialAdjacentToPrev(prevOpen, open, consumedLines)) {
target = prevOpen;
}
}
if (!target && next) target = next;
if (!target) continue;
// markdown-it-attrs collapses consecutive standalone IALs into the
// attrs of the first paragraph but emits them in REVERSE source
// order. Detect the multi-line IAL paragraph (map spans 2+ lines)
// and reverse to match kramdown's source-order output.
const attrsList = open.map && open.map[1] - open.map[0] > 1
? [...open.attrs].reverse()
: open.attrs;
mergeAttrs(target, attrsList);
// Record the IAL's source line range so a following IAL one
// line away still counts as adjacent to the heading.
if (open.map) {
for (let ln = open.map[0]; ln < open.map[1]; ln++) consumedLines.add(ln);
}
toks.splice(i, 3);
i--;
}
});
}
// True when the IAL paragraph's first source line is the line right
// after the previous block's last source line (no blank line gap).
// Consumed lines (occupied by removed earlier IALs) count as belonging
// to the previous block so that consecutive `{: ... }` IALs all attach
// to the same heading.
function ialAdjacentToPrev(prevOpen, ialOpen, consumedLines) {
if (!prevOpen.map || !ialOpen.map) return false;
let line = prevOpen.map[1];
while (line < ialOpen.map[0]) {
if (!consumedLines.has(line)) return false;
line++;
}
return true;
}
function isHeadingOrParagraphClose(t) {
return t.type === "heading_close" || t.type === "paragraph_close";
}
// Walk back from a close token to its matching open token at the same
// nesting level. Tag matches (h1 close -> h1 open, p close -> p open).
function findBlockOpenFor(toks, closeIdx) {
const close = toks[closeIdx];
const openType = close.type.replace("_close", "_open");
let depth = 0;
for (let k = closeIdx; k >= 0; k--) {
const t = toks[k];
if (t.type === close.type && t.tag === close.tag) depth++;
else if (t.type === openType && t.tag === close.tag) {
depth--;
if (depth === 0) return t;
}
}
return null;
}
// ---------- loose-deflist <p> rewrap ----------------------------------------
//
// markdown-it-deflist emits paragraph_open / paragraph_close around every
// <dd> body but marks them `hidden=true` when the list parses as "tight".
// kramdown's rule is per-item: a definition that's separated from its
// term by a blank line wraps in <p>. Detect that gap by comparing the dt
// term's end line to the inner paragraph_open's start line and unhide
// the wrapper pair when the gap is >1.
// ---------- list-item paragraph unwrap (kramdown tightness) -----------------
//
// markdown-it determines tightness at the LIST level: any blank line
// between top-level items makes the entire list loose, which adds
// `<p>...</p>` around every item's inline content. kramdown's rule is
// per-item: an item gets `<p>` wrap only when it actually contains
// multiple paragraph blocks (e.g. inline + blank + more inline). An
// item that's just "inline + nested list" stays unwrapped.
//
// We post-process after block parsing: for each list_item_open, count
// the top-level paragraph_open tokens. If there's exactly one (the
// initial inline content), hide its paragraph_open / paragraph_close
// to match kramdown's tight emit.
function tightLooseListPlugin(md) {
md.core.ruler.after("block", "tight-loose-list", (state) => {
const srcLines = state.src.split("\n");
const toks = state.tokens;
// Records per-item tightness decisions so the post-pass can apply
// kramdown's "last item is loose unless an earlier sibling is
// tight" rule (see kramdown/parser/kramdown/list.rb#132-139).
// Keyed by list_item_open token index; value = { wouldBeTight,
// listListOpenIdx, paraOpenIdx, paraCloseIdx }.
const decisions = new Map();
// Map of list_open index -> array of contained item indices.
const listItems = new Map();
for (let i = 0; i < toks.length; i++) {
if (toks[i].type !== "list_item_open") continue;
const itemLevel = toks[i].level;
const itemMap = toks[i].map;
let firstParaOpenIdx = -1;
let extraParagraphs = false;
let nextBlockAfterParaMap = null;
let close = -1;
for (let j = i + 1; j < toks.length; j++) {
const t = toks[j];
if (t.level === itemLevel && t.type === "list_item_close") { close = j; break; }
if (t.type === "paragraph_open" && t.level === itemLevel + 1) {
if (firstParaOpenIdx < 0) firstParaOpenIdx = j;
else extraParagraphs = true;
}
// First level-+1 block AFTER the first paragraph (nested list,
// code block, etc.). Captures the start line so we can tell
// whether the paragraph and that block are blank-separated.
if (firstParaOpenIdx >= 0 && nextBlockAfterParaMap === null &&
t.level === itemLevel + 1 &&
j > firstParaOpenIdx &&
t.type !== "inline" && t.type !== "paragraph_close" &&
t.type !== "paragraph_open") {
nextBlockAfterParaMap = t.map;
}
}
if (close < 0 || firstParaOpenIdx < 0 || extraParagraphs) continue;
const pOpen = toks[firstParaOpenIdx];
const hasNested = nextBlockAfterParaMap !== null;
const internalBlank = paragraphHasTrailingBlank(srcLines, pOpen.map, nextBlockAfterParaMap);
const siblingBlank = !hasNested && hasSiblingBlank(srcLines, toks, i, close, itemMap);
// Find the enclosing list_open by walking back to a token of
// level itemLevel - 1 with type list_open / bullet_list_open /
// ordered_list_open.
let listOpenIdx = -1;
for (let k = i - 1; k >= 0; k--) {
const t = toks[k];
if (t.level === itemLevel - 1 &&
(t.type === "bullet_list_open" || t.type === "ordered_list_open")) {
listOpenIdx = k;
break;
}
}
if (!listItems.has(listOpenIdx)) listItems.set(listOpenIdx, []);
listItems.get(listOpenIdx).push(i);
// Find this item's paragraph_close.
let paraCloseIdx = -1;
for (let j = firstParaOpenIdx + 1; j < close; j++) {
if (toks[j].type === "paragraph_close" && toks[j].level === pOpen.level) {
paraCloseIdx = j;
break;
}
}
const wouldBeTight = !internalBlank && !siblingBlank && paraCloseIdx >= 0;
decisions.set(i, { wouldBeTight, paraOpenIdx: firstParaOpenIdx, paraCloseIdx, listOpenIdx });
}
// Apply kramdown's last-item rule: if the LAST item in a list would
// be tight, but NO earlier item is tight, leave it loose. This
// matches the condition 3 third sub-branch in kramdown's source:
// tight only if some earlier sibling has already been marked
// transparent (or has a non-paragraph first child).
for (const [, items] of listItems) {
if (items.length < 2) continue;
const lastIdx = items[items.length - 1];
const lastDecision = decisions.get(lastIdx);
if (!lastDecision || !lastDecision.wouldBeTight) continue;
let anyEarlierTight = false;
for (let k = 0; k < items.length - 1; k++) {
const d = decisions.get(items[k]);
if (d && d.wouldBeTight) { anyEarlierTight = true; break; }
}
if (!anyEarlierTight) {
lastDecision.wouldBeTight = false;
}
}
// Apply decisions: hide the paragraph open/close for tight items.
for (const d of decisions.values()) {
if (d.wouldBeTight) {
toks[d.paraOpenIdx].hidden = true;
toks[d.paraCloseIdx].hidden = true;
}
}
});
}
function paragraphHasTrailingBlank(srcLines, paraMap, nextBlockMap) {
// Returns true only when there's a following block within the item
// AND a blank line separates the paragraph from it. The trailing
// blank line that just marks the item's end (no following sibling
// block inside the item) is the LIST's separator, not internal.
if (!paraMap || !nextBlockMap) return false;
if (nextBlockMap[0] <= paraMap[1]) return false;
return (srcLines[paraMap[1]] ?? "").trim() === "";
}
function hasSiblingBlank(srcLines, toks, openIdx, closeIdx, itemMap) {
if (!itemMap) return false;
const lastIdx = itemMap[1] - 1;
if (lastIdx >= itemMap[0] && (srcLines[lastIdx] ?? "").trim() === "" &&
toks[closeIdx + 1]?.type === "list_item_open") {
return true;
}
const prevClose = toks[openIdx - 1];
if (prevClose?.type === "list_item_close" && prevClose.level === toks[openIdx].level) {
let depth = 0;
for (let k = openIdx - 1; k >= 0; k--) {
const t = toks[k];
if (t.type === "list_item_close" && t.level === toks[openIdx].level) depth++;
else if (t.type === "list_item_open" && t.level === toks[openIdx].level) {
depth--;
if (depth === 0) {
const prevMap = t.map;
if (prevMap) {
const prevLast = prevMap[1] - 1;
if (prevLast >= prevMap[0] && (srcLines[prevLast] ?? "").trim() === "") {
return true;
}
}
break;
}
}
}
}
return false;
}
function looseDeflistPlugin(md) {
// Per-dd looseness, equivalent to the per-item rule we apply on
// bullet/ordered lists:
// - The first <p> inside a <dd> is wrapped IFF the source has a
// blank line between the term and the definition (loose form).
// - Otherwise the <p> is suppressed.
// markdown-it-deflist tracks looseness at the LIST level, so any
// multi-block <dd> in the list flips every other <dd>'s paragraph
// to visible. Override both directions: hide when tight, unhide
// when loose.
md.core.ruler.after("block", "deflist-tightness", (state) => {
const srcLines = state.src.split("\n");
const toks = state.tokens;
let dtEndLine = -1;
for (let i = 0; i < toks.length; i++) {
const t = toks[i];
if (t.type === "dt_open") {
dtEndLine = -1;
} else if (t.type === "dt_close") {
const inline = toks[i - 1];
dtEndLine = inline?.map?.[1] ?? -1;
} else if (t.type === "dd_open") {
const inner = toks[i + 1];
if (inner?.type !== "paragraph_open") continue;
const ddLevel = t.level;
let ddClose = -1;
let nextBlockAfterParaMap = null;
for (let j = i + 1; j < toks.length; j++) {
const u = toks[j];
if (u.level === ddLevel && u.type === "dd_close") { ddClose = j; break; }
if (j > i + 1 && u.level === ddLevel + 1 &&
u.type !== "paragraph_close" && u.type !== "inline" &&
u.type !== "paragraph_open" && nextBlockAfterParaMap === null) {
nextBlockAfterParaMap = u.map;
}
}
if (ddClose < 0) continue;
// kramdown's deflist looseness, observed empirically: ONLY the
// dt -> dd blank line counts. An internal blank between the
// definition's first paragraph and a nested list inside the
// same dd does NOT make the dd loose (unlike bullet/ordered
// list items, where it does). Keep the rule narrow.
const wantsLoose = dtEndLine >= 0 && inner.map && inner.map[0] > dtEndLine + 1;
if (inner.hidden === !wantsLoose) continue;
inner.hidden = !wantsLoose;
for (let j = i + 2; j < ddClose; j++) {
if (toks[j].type === "paragraph_close" && toks[j].level === inner.level) {
toks[j].hidden = inner.hidden;
break;
}
}
}
}
});
}
function mergeAttrs(token, addAttrs) {
for (const [key, value] of addAttrs) {
if (key === "class") {
const cur = token.attrGet("class");
token.attrSet("class", cur ? `${cur} ${value}` : value);
} else {
token.attrSet(key, value);
}
}
}
// ---------- §5.5 footnote rendering overrides -------------------------------
//
// markdown-it-footnote emits `fnref-N` (hyphen) + `footnote-backref` /
// `<section class="footnotes">` shapes. kramdown emits `fnref:N` (colon) +
// `reversefootnote` / `<div class="footnotes">`. Five render-rule
// overrides line up with the kramdown shapes verified against
// docs/_site/Features/index.html.