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76 lines
2.5 KiB
76 lines
2.5 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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* Updated by Jared Palmer;
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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 toSlug = require('github-slugger').slug;
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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 = ({icon = svgIcon, className = `anchor`} = {}) => {
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return function transformer(tree) {
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const ids = new Set();
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visit(tree, 'heading', (node) => {
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let children = [...node.children];
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let id;
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if (children[children.length - 1].type === 'mdxTextExpression') {
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// # My header {/*my-header*/}
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id = children.pop().value;
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const isValidCustomId = id.startsWith('/*') && id.endsWith('*/');
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if (!isValidCustomId) {
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throw Error(
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'Expected header ID to be like: {/*some-header*/}. ' +
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'Instead, received: ' +
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id
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);
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}
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id = id.slice(2, id.length - 2);
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if (id !== toSlug(id)) {
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throw Error(
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'Expected header ID to be a valid slug. You specified: {/*' +
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id +
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'*/}. Replace it with: {/*' +
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toSlug(id) +
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'*/}'
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);
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}
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} else {
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// # My header
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id = toSlug(toString(node));
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}
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if (ids.has(id)) {
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throw Error(
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'Cannot have a duplicate header with id "' +
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id +
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'" on the page. ' +
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'Rename the section or give it an explicit unique ID. ' +
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'For example: #### Arguments {/*setstate-arguments*/}'
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);
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}
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ids.add(id);
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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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});
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};
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};
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