65 lines
2.3 KiB
JavaScript
65 lines
2.3 KiB
JavaScript
// modified from https://github.com/mapbox/rehype-prism/blob/fb4174fce30a1cde8d784fa94e7c04d8a7fa6d28/index.js
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// MIT License
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// Copyright (c) 2017 Mapbox
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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'use strict';
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const visit = require('unist-util-visit');
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const nodeToString = require('hast-util-to-string');
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const refractor = require('refractor');
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module.exports = (options) => {
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options = options || {};
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if (options.alias) {
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refractor.alias(options.alias);
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}
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return (tree) => {
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visit(tree, 'element', (node, index, parent) => {
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if (typeof parent === 'undefined' ||
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parent.tagName !== 'pre' ||
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node.tagName !== 'code'
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) {
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return;
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}
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const languagePrefix = 'language-';
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const langClass = ((node.properties.className || []).find(item => item.startsWith(languagePrefix)) || '').toLowerCase();
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if (langClass.length === 0) {
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return;
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}
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const lang = langClass.substr(languagePrefix.length);
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try {
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parent.properties.className = (parent.properties.className || []).concat(langClass);
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const result = refractor.highlight(nodeToString(node), lang);
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node.children = result;
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} catch (err) {
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if (options.ignoreMissing && /Unknown language/.test(err.message)) {
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return;
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}
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throw err;
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}
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});
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};
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};
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