mirror of
https://github.com/laurent22/joplin.git
synced 2024-11-30 08:26:59 +02:00
67 lines
2.2 KiB
JavaScript
67 lines
2.2 KiB
JavaScript
const { shim } = require('lib/shim');
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const katex = require('katex');
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const katexCss = require('lib/csstojs/katex.css.js');
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const Setting = require('lib/models/Setting');
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class MdToHtml_Katex {
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constructor() {
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this.cache_ = {};
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this.assetsLoaded_ = false;
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}
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name() {
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return 'katex';
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}
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processContent(renderedTokens, content, tagType) {
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try {
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const cacheKey = tagType + '_' + content;
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let renderered = null;
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if (this.cache_[cacheKey]) {
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renderered = this.cache_[cacheKey];
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} else {
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renderered = katex.renderToString(content, {
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displayMode: tagType === 'block',
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});
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this.cache_[cacheKey] = renderered;
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}
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if (tagType === 'block') renderered = '<p>' + renderered + '</p>';
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renderedTokens.push(renderered);
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} catch (error) {
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renderedTokens.push('Cannot render Katex content: ' + error.message);
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}
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return renderedTokens;
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}
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extraCss() {
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return katexCss;
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}
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async loadAssets() {
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if (this.assetsLoaded_) return;
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// In node, the fonts are simply copied using copycss to where Katex expects to find them, which is under app/gui/note-viewer/fonts
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// In React Native, it's more complicated and we need to download and copy them to the right directory. Ideally, we should embed
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// them as an asset and copy them from there (or load them from there by modifying Katex CSS), but for now that will do.
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if (shim.isReactNative()) {
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// Fonts must go under the resourceDir directory because this is the baseUrl of NoteBodyViewer
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const baseDir = Setting.value('resourceDir');
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await shim.fsDriver().mkdir(baseDir + '/fonts');
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await shim.fetchBlob('https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0-beta1/fonts/KaTeX_Main-Regular.woff2', { overwrite: false, path: baseDir + '/fonts/KaTeX_Main-Regular.woff2' });
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await shim.fetchBlob('https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0-beta1/fonts/KaTeX_Math-Italic.woff2', { overwrite: false, path: baseDir + '/fonts/KaTeX_Math-Italic.woff2' });
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await shim.fetchBlob('https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0-beta1/fonts/KaTeX_Size1-Regular.woff2', { overwrite: false, path: baseDir + '/fonts/KaTeX_Size1-Regular.woff2' });
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}
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this.assetsLoaded_ = true;
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}
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}
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module.exports = MdToHtml_Katex; |