/** * Copyright (c) Facebook, Inc. and its affiliates. */ /*! * Based on 'gatsby-remark-autolink-headers' * Original Author: Kyle Mathews <mathews.kyle@gmail.com> * Copyright (c) 2015 Gatsbyjs */ const toString = require('mdast-util-to-string'); const visit = require('unist-util-visit'); const slugs = require('github-slugger')(); function patch(context, key, value) { if (!context[key]) { context[key] = value; } return context[key]; } 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>`; module.exports = ( {markdownAST}, {icon = svgIcon, className = `anchor`, maintainCase = false}, ) => { slugs.reset(); visit(markdownAST, 'heading', node => { // Support custom-id syntax. const rawHeader = toString(node); const match = /^.+(\s*\{#([a-z0-9\-_]+?)\}\s*)$/.exec(rawHeader); const id = match ? match[2] : slugs.slug(rawHeader, maintainCase); if (match) { // Remove the custom ID part from the text node. const lastNode = node.children[node.children.length - 1]; lastNode.value = lastNode.value.replace(match[1], ''); } const data = patch(node, 'data', {}); patch(data, 'id', id); patch(data, 'htmlAttributes', {}); patch(data, 'hProperties', {}); patch(data.htmlAttributes, 'id', id); patch(data.hProperties, 'id', id); if (icon !== false) { node.children.unshift({ type: 'link', url: `#${id}`, title: null, data: { hProperties: { 'aria-hidden': true, class: className, }, hChildren: [ { type: 'raw', // The Octicon link icon is the default. But users can set their own icon via the "icon" option. value: icon, }, ], }, }); } }); return markdownAST; };