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Update MD051/link-fragments to handle links and images in headings (fixes #945).

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This commit is contained in:
David Anson 2023-09-04 12:26:38 -07:00
parent 6a2b86753b
commit a736588958
5 changed files with 133 additions and 47 deletions
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35
lib/md051.js
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@ -3,13 +3,18 @@
"use strict";
const { addError, addErrorDetailIf } = require("../helpers");
const { filterByTypes, getHtmlTagInfo } = require("../helpers/micromark.cjs");
const { filterByPredicate, filterByTypes, getHtmlTagInfo } =
require("../helpers/micromark.cjs");
// Regular expression for identifying HTML anchor names
const idRe = /\sid\s*=\s*['"]?([^'"\s>]+)/iu;
const nameRe = /\sname\s*=\s*['"]?([^'"\s>]+)/iu;
const anchorRe = /\{(#[a-z\d]+(?:[-_][a-z\d]+)*)\}/gu;
// Sets for filtering heading tokens during conversion
const childrenExclude = new Set([ "image", "reference", "resource" ]);
const tokensInclude = new Set([ "codeTextData", "data" ]);
/**
* Converts a Markdown heading into an HTML fragment according to the rules
* used by GitHub.
@ -19,7 +24,11 @@ const anchorRe = /\{(#[a-z\d]+(?:[-_][a-z\d]+)*)\}/gu;
*/
function convertHeadingToHTMLFragment(headingText) {
const inlineText =
filterByTypes(headingText.children, [ "codeTextData", "data" ])
filterByPredicate(
headingText.children,
(token) => tokensInclude.has(token.type),
(token) => (childrenExclude.has(token.type) ? [] : token.children)
)
.map((token) => token.text)
.join("");
return "#" + encodeURIComponent(
@ -52,16 +61,18 @@ module.exports = {
);
for (const headingText of headingTexts) {
const fragment = convertHeadingToHTMLFragment(headingText);
const count = fragments.get(fragment) || 0;
if (count) {
fragments.set(`${fragment}-${count}`, 0);
}
fragments.set(fragment, count + 1);
let match = null;
while ((match = anchorRe.exec(headingText.text)) !== null) {
const [ , anchor ] = match;
if (!fragments.has(anchor)) {
fragments.set(anchor, 1);
if (fragment !== "#") {
const count = fragments.get(fragment) || 0;
if (count) {
fragments.set(`${fragment}-${count}`, 0);
}
fragments.set(fragment, count + 1);
let match = null;
while ((match = anchorRe.exec(headingText.text)) !== null) {
const [ , anchor ] = match;
if (!fragments.has(anchor)) {
fragments.set(anchor, 1);
}
}
}
}