angular-cn/aio/tools/transforms/angular-base-package/post-processors/autolink-headings.js

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const has = require('hast-util-has-property');
const is = require('hast-util-is-element');
const slug = require('rehype-slug');
const visit = require('unist-util-visit');
/**
* Get remark to add IDs to headings and inject anchors into them.
* This is a stripped-down equivalent of [rehype-autolink-headings](https://github.com/wooorm/rehype-autolink-headings)
* that supports ignoring headings with the `no-anchor` class.
*/
const HEADINGS = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];
const NO_ANCHOR_CLASS = 'no-anchor';
const clone = obj => JSON.parse(JSON.stringify(obj));
const hasClass = (node, cls) => {
const className = node.properties.className;
return className && className.includes(cls);
};
const link = options =>
tree => visit(tree, node => {
if (is(node, HEADINGS) && has(node, 'id') && !hasClass(node, NO_ANCHOR_CLASS)) {
node.children.unshift({
type: 'element',
tagName: 'a',
properties: Object.assign(clone(options.properties), {href: `#${node.properties.id}`}),
children: clone(options.content)
});
}
});
module.exports = [
slug,
[link, {
properties: {
title: 'Link to this heading',
className: ['header-link'],
'aria-hidden': 'true'
},
content: [
{
type: 'element',
tagName: 'i',
properties: {className: ['material-icons']},
children: [{ type: 'text', value: 'link' }]
}
]
}]
];