59 lines
1.6 KiB
TypeScript
59 lines
1.6 KiB
TypeScript
import Slugger from 'github-slugger';
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import { visit } from 'unist-util-visit';
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import type { MarkdownHeading, MarkdownVFile, RehypePlugin } from './types.js';
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const rawNodeTypes = new Set(['text', 'raw', 'mdxTextExpression']);
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const codeTagNames = new Set(['code', 'pre']);
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export function rehypeHeadingIds(): ReturnType<RehypePlugin> {
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return function (tree, file: MarkdownVFile) {
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const headings: MarkdownHeading[] = [];
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const slugger = new Slugger();
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const isMDX = isMDXFile(file);
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visit(tree, (node) => {
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if (node.type !== 'element') return;
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const { tagName } = node;
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if (tagName[0] !== 'h') return;
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const [_, level] = tagName.match(/h([0-6])/) ?? [];
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if (!level) return;
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const depth = Number.parseInt(level);
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let text = '';
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visit(node, (child, __, parent) => {
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if (child.type === 'element' || parent == null) {
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return;
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}
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if (child.type === 'raw') {
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if (child.value.match(/^\n?<.*>\n?$/)) {
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return;
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}
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}
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if (rawNodeTypes.has(child.type)) {
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if (isMDX || codeTagNames.has(parent.tagName)) {
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text += child.value;
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} else {
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text += child.value.replace(/\{/g, '${');
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}
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}
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});
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node.properties = node.properties || {};
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if (typeof node.properties.id !== 'string') {
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let slug = slugger.slug(text);
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if (slug.endsWith('-')) slug = slug.slice(0, -1);
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node.properties.id = slug;
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}
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headings.push({ depth, slug: node.properties.id, text });
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});
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file.data.__astroHeadings = headings;
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};
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}
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function isMDXFile(file: MarkdownVFile) {
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return Boolean(file.history[0]?.endsWith('.mdx'));
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}
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