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73 lines
2.2 KiB
73 lines
2.2 KiB
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*/
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/*!
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* Based on 'gatsby-remark-autolink-headers'
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* Original Author: Kyle Mathews <mathews.kyle@gmail.com>
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* Copyright (c) 2015 Gatsbyjs
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*/
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const toString = require('mdast-util-to-string');
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const visit = require('unist-util-visit');
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const slugs = require('github-slugger')();
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function patch(context, key, value) {
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if (!context[key]) {
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context[key] = value;
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}
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return context[key];
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}
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const svgIcon = `<svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>`;
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module.exports = (
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{markdownAST},
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{icon = svgIcon, className = `anchor`, maintainCase = false},
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) => {
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slugs.reset();
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visit(markdownAST, 'heading', node => {
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// Support custom-id syntax.
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const rawHeader = toString(node);
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const match = /^.+(\s*\{#([a-z0-9\-_]+?)\}\s*)$/.exec(rawHeader);
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const id = match ? match[2] : slugs.slug(rawHeader, maintainCase);
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if (match) {
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// Remove the custom ID part from the text node.
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const lastNode = node.children[node.children.length - 1];
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lastNode.value = lastNode.value.replace(match[1], '');
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}
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const data = patch(node, 'data', {});
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patch(data, 'id', id);
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patch(data, 'htmlAttributes', {});
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patch(data, 'hProperties', {});
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patch(data.htmlAttributes, 'id', id);
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patch(data.hProperties, 'id', id);
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if (icon !== false) {
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node.children.unshift({
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type: 'link',
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url: `#${id}`,
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title: null,
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data: {
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hProperties: {
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'aria-hidden': true,
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class: className,
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},
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hChildren: [
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{
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type: 'raw',
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// The Octicon link icon is the default. But users can set their own icon via the "icon" option.
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value: icon,
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},
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],
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},
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});
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}
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});
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return markdownAST;
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};
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