72 lines
2.4 KiB
JavaScript
72 lines
2.4 KiB
JavaScript
/* jshint node:true, browser:true, -W044 */
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// Adds highlight syntax as per RedCarpet:
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//
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// https://github.com/vmg/redcarpet
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//
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// This is ==highlighted==. It looks like this: <mark>highlighted</mark>
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(function () {
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var highlight = function () {
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return [
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{
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type: 'html',
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filter: function (text) {
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var highlightRegex = /(=){2}([\s\S]+?)(=){2}/gim,
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preExtractions = {},
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codeExtractions = {},
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hashID = 0;
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function hashId() {
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return hashID += 1;
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}
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// Extract pre blocks
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text = text.replace(/<pre>[\s\S]*?<\/pre>/gim, function (x) {
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var hash = hashId();
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preExtractions[hash] = x;
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return '{gfm-js-extract-pre-' + hash + '}';
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}, 'm');
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// Extract code blocks
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text = text.replace(/<code>[\s\S]*?<\/code>/gim, function (x) {
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var hash = hashId();
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codeExtractions[hash] = x;
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return '{gfm-js-extract-code-' + hash + '}';
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}, 'm');
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text = text.replace(highlightRegex, function (match, n, content) {
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// Check the content isn't just an `=`
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if (!/^=+$/.test(content)) {
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return '<mark>' + content + '</mark>';
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}
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return match;
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});
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// replace pre extractions
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text = text.replace(/\{gfm-js-extract-pre-([0-9]+)\}/gm, function (x, y) {
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return preExtractions[y];
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});
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// replace code extractions
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text = text.replace(/\{gfm-js-extract-code-([0-9]+)\}/gm, function (x, y) {
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return codeExtractions[y];
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});
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return text;
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}
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}
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];
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};
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// Client-side export
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if (typeof window !== 'undefined' && window.Showdown && window.Showdown.extensions) {
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window.Showdown.extensions.highlight = highlight;
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}
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// Server-side export
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if (typeof module !== 'undefined') {
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module.exports = highlight;
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}
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}());
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