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Fix misplaced anchors for remark and proof-like divs #73

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Merged
d-morrison merged 1 commit into from
Oct 7, 2026
Merged

Fix misplaced anchors for remark and proof-like divs #73

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35 changes: 33 additions & 2 deletions _extensions/div-anchors/div-anchors.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,15 +17,30 @@ const theoremLikeClasses = new Set([
"exr",
"exercise",
"proof",
"rem",
"remark",
"sol",
"solution"
]);
const theoremLikePrefixes = [
"thm-",
"lem-",
"cor-",
"prp-",
"cnj-",
"def-",
"exm-",
"exr-",
"rem-",
"sol-"
];
const inlineAnchorSeparator = "\u00A0";
const maxAnchorRetryAttempts = 5;
const anchorRetryDelayMs = 50;

const isTheoremLikeDiv = (div) =>
Array.from(div.classList).some((className) => theoremLikeClasses.has(className));
Array.from(div.classList).some((className) => theoremLikeClasses.has(className)) ||
(div.id && theoremLikePrefixes.some((prefix) => div.id.startsWith(prefix)));

const addTheoremLikeDivAnchors = () => {
for (const theoremDiv of window.document.querySelectorAll("div[id]")) {
Expand Down Expand Up @@ -85,7 +100,7 @@ const moveTheoremDivAnchorsInline = () => {
continue;
}

const theoremTitle = theoremDiv.querySelector(".theorem-title");
const theoremTitle = theoremDiv.querySelector(".theorem-title, .proof-title");
if (!theoremTitle) {
continue;
}
Expand All @@ -107,6 +122,22 @@ const moveTheoremDivAnchorsInline = () => {
}

anchorLink.classList.remove("external");

// If the title ends with whitespace (e.g. Quarto's proof-title ending in ". "),
// trim the trailing whitespace so the non-breaking separator and anchor stay attached
// to the title text, and ensure a trailing space separates the anchor from following content.
let lastTextNode = theoremTitle.lastChild;
while (lastTextNode && lastTextNode.nodeType !== Node.TEXT_NODE && lastTextNode.lastChild) {
lastTextNode = lastTextNode.lastChild;
}
if (lastTextNode && lastTextNode.nodeType === Node.TEXT_NODE && /\s+$/.test(lastTextNode.textContent)) {
lastTextNode.textContent = lastTextNode.textContent.replace(/\s+$/, "");
if (theoremTitle.nextSibling &&
!(theoremTitle.nextSibling.nodeType === Node.TEXT_NODE && /^\s/.test(theoremTitle.nextSibling.textContent))) {
theoremTitle.after(" ");
}
}

theoremTitle.append(inlineAnchorSeparator);
theoremTitle.append(anchorLink);
}
Expand Down
33 changes: 33 additions & 0 deletions _extensions/div-anchors/div-anchors.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -16,10 +16,39 @@ local theorem_div_classes = {
"exr",
"exercise",
"proof",
"rem",
"remark",
"sol",
"solution"
}

local theorem_id_prefixes = {
"thm-",
"lem-",
"cor-",
"prp-",
"cnj-",
"def-",
"exm-",
"exr-",
"rem-",
"sol-"
}

local function id_is_theorem_like(id)
if not id then
return false
end

for _, prefix in ipairs(theorem_id_prefixes) do
if id:sub(1, #prefix) == prefix then
return true
end
end

return false
end

local function class_is_theorem_like(class)
for _, theorem_class in ipairs(theorem_div_classes) do
if class == theorem_class then
Expand All @@ -31,6 +60,10 @@ local function class_is_theorem_like(class)
end

local function is_theorem_div(div)
if id_is_theorem_like(div.identifier) then
return true
end

for _, class in ipairs(div.classes) do
if class_is_theorem_like(class) then
return true
Expand Down
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