mirror of
https://github.com/laurent22/joplin.git
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70 lines
2.2 KiB
TypeScript
70 lines
2.2 KiB
TypeScript
/* eslint prefer-const: 0*/
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// Note: this is copied from https://github.com/markdown-it/markdown-it/blob/master/lib/renderer.js
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// Markdown-it assigns a special meaning to code returned from highlight() when it starts with PRE or not.
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// If it starts with PRE, the highlited code is returned as-is. If it does not, it is wrapped in <PRE><CODE>
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// This is a bit of a hack and magic behaviour, and it prevents us from returning a DIV from the highlight
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// function.
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// So we modify the code below to allow highlight() to return an object that tells how to render
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// the code.
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function plugin(markdownIt: any) {
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// @ts-ignore: Keep the function signature as-is despite unusued arguments
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markdownIt.renderer.rules.fence = function(tokens: any[], idx: number, options: any, env: any, slf: any) {
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let token = tokens[idx],
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info = token.info ? markdownIt.utils.unescapeAll(token.info).trim() : '',
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langName = '',
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highlighted, i, tmpAttrs, tmpToken;
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if (info) {
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langName = info.split(/\s+/g)[0];
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}
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if (options.highlight) {
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highlighted = options.highlight(token.content, langName) || markdownIt.utils.escapeHtml(token.content);
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} else {
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highlighted = markdownIt.utils.escapeHtml(token.content);
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}
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const wrapCode = highlighted && highlighted.wrapCode !== false;
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highlighted = typeof highlighted !== 'string' ? highlighted.html : highlighted;
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if (highlighted.indexOf('<pre') === 0 || !wrapCode) {
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return `${highlighted}\n`;
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}
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// If language exists, inject class gently, without modifying original token.
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// May be, one day we will add .clone() for token and simplify this part, but
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// now we prefer to keep things local.
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if (info) {
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i = token.attrIndex('class');
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tmpAttrs = token.attrs ? token.attrs.slice() : [];
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if (i < 0) {
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tmpAttrs.push(['class', options.langPrefix + langName]);
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} else {
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tmpAttrs[i][1] += ` ${options.langPrefix}${langName}`;
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}
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// Fake token just to render attributes
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tmpToken = {
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attrs: tmpAttrs,
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};
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return `<pre><code${slf.renderAttrs(tmpToken)}>${
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highlighted
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}</code></pre>\n`;
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}
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return `<pre><code${slf.renderAttrs(token)}>${
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highlighted
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}</code></pre>\n`;
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};
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}
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export default {
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plugin,
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};
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