117 lines
2.3 KiB
Vue
117 lines
2.3 KiB
Vue
<script>
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/* global katex */
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import marked from 'marked';
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import sanitize from 'sanitize-html';
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import Prompt from './prompt.vue';
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const renderer = new marked.Renderer();
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/*
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Regex to match KaTex blocks.
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Supports the following:
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\begin{equation}<math>\end{equation}
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$$<math>$$
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inline $<math>$
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The matched text then goes through the KaTex renderer & then outputs the HTML
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*/
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const katexRegexString = `(
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^\\\\begin{[a-zA-Z]+}\\s
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^\\$\\$
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\\s\\$(?!\\$)
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)
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((.|\\n)+?)
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(
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\\s\\\\end{[a-zA-Z]+}$
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\\$\\$$
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\\$
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)
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`
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.replace(/\s/g, '')
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.trim();
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renderer.paragraph = t => {
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let text = t;
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let inline = false;
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if (typeof katex !== 'undefined') {
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const katexString = text
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.replace(/&/g, '&')
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.replace(/&=&/g, '\\space=\\space')
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.replace(/<(\/?)em>/g, '_');
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const regex = new RegExp(katexRegexString, 'gi');
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const matchLocation = katexString.search(regex);
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const numberOfMatches = katexString.match(regex);
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if (numberOfMatches && numberOfMatches.length !== 0) {
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if (matchLocation > 0) {
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let matches = regex.exec(katexString);
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inline = true;
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while (matches !== null) {
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const renderedKatex = katex.renderToString(matches[0].replace(/\$/g, ''));
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text = `${text.replace(matches[0], ` ${renderedKatex}`)}`;
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matches = regex.exec(katexString);
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}
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} else {
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const matches = regex.exec(katexString);
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text = katex.renderToString(matches[2]);
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}
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}
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}
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return `<p class="${inline ? 'inline-katex' : ''}">${text}</p>`;
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};
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marked.setOptions({
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sanitize: true,
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renderer,
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});
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export default {
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components: {
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prompt: Prompt,
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},
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props: {
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cell: {
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type: Object,
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required: true,
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},
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},
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computed: {
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markdown() {
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return sanitize(marked(this.cell.source.join('').replace(/\\/g, '\\\\')), {
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allowedTags: false,
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allowedAttributes: {
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'*': ['class'],
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},
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});
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},
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},
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};
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</script>
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<template>
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<div class="cell text-cell">
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<prompt />
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<div class="markdown" v-html="markdown"></div>
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</div>
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</template>
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<style>
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.markdown .katex {
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display: block;
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text-align: center;
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}
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.markdown .inline-katex .katex {
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display: inline;
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text-align: initial;
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}
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</style>
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