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import { unistUtilVisit } from 'dumi';
import type { UnifiedTransformer } from 'dumi';
let toSlug: typeof import('github-slugger').slug;
// workaround to import pure esm module
(async () => {
({ slug: toSlug } = await import('github-slugger'));
})();
const isNil = (value: any) => value == null;
const toArr = <T>(value: T | T[]) => {
if (isNil(value)) {
return [];
}
return Array.isArray(value) ? value : [value];
};
const patch = (context: Record<string, any>, key: string, value: any) => {
if (!context[key]) {
context[key] = value;
}
return context[key];
};
interface Options {
level?: number;
}
const remarkAnchor = (opt: Options = {}): UnifiedTransformer<any> => {
// https://regex101.com/r/WDjkK0/1
const RE = /\s*\{#([^}]+)\}$/;
const realOpt = {
level: [1, 2, 3, 4, 5, 6],
...opt,
};
return function transformer(tree) {
const ids = new Set();
unistUtilVisit.visit(tree, 'heading', (node) => {
if (toArr(realOpt.level).indexOf(node.depth) === -1) {
return unistUtilVisit.CONTINUE;
}
const lastIndex = node.children.length - 1;
const lastChild = node.children[lastIndex];
if (lastChild?.type === 'text') {
const text = lastChild.value;
const match = text.match(RE);
if (match) {
const id = match[1];
if (id !== toSlug(id)) {
throw new Error(
`Expected header ID to be a valid slug. You specified: {#${id}}. Replace it with: {#${toSlug(id)}}`,
);
}
node.data ??= {};
node.data.hProperties = { ...node.data.hProperties, id };
lastChild.value = text.replace(RE, '');
if (lastChild.value === '') {
node.children.pop();
}
if (ids.has(id)) {
throw new Error(`Cannot have a duplicate header with id "${id}" on the page.
Rename the section or give it an explicit unique ID. For example: #### Arguments {#setstate-arguments}`);
}
ids.add(id);
const data = patch(node, 'data', {});
patch(data, 'id', id);
patch(data, 'htmlAttributes', {});
patch(data, 'hProperties', {});
patch(data.htmlAttributes, 'id', id);
patch(data.hProperties, 'id', id);
}
}
});
};
};
export default remarkAnchor;
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