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<script>
/* eslint-disable vue/no-v-html */
import marked from 'marked';
import { sanitize } from 'dompurify';
import katex from 'katex';
import Prompt from './prompt.vue';
const renderer = new marked.Renderer();
/*
Regex to match KaTex blocks.
Supports the following:
\begin{equation}<math>\end{equation}
$$<math>$$
inline $<math>$
The matched text then goes through the KaTex renderer & then outputs the HTML
*/
const katexRegexString = `(
^\\\\begin{[a-zA-Z]+}\\s
|
^\\$\\$
|
\\s\\$(?!\\$)
)
((.|\\n)+?)
(
\\s\\\\end{[a-zA-Z]+}$
|
\\$\\$$
|
\\$
)
`
.replace(/\s/g, '')
.trim();
function renderKatex(t) {
let text = t;
let numInline = 0; // number of successfull converted math formulas
if (typeof katex !== 'undefined') {
const katexString = text
.replace(/&/g, '&')
.replace(/&=&/g, '\\space=\\space') // eslint-disable-line @gitlab/require-i18n-strings
.replace(/<(\/?)em>/g, '_');
const regex = new RegExp(katexRegexString, 'gi');
const matchLocation = katexString.search(regex);
const numberOfMatches = katexString.match(regex);
if (numberOfMatches && numberOfMatches.length !== 0) {
let matches = regex.exec(katexString);
if (matchLocation > 0) {
numInline += 1;
while (matches !== null) {
try {
const renderedKatex = katex.renderToString(
matches[0].replace(/\$/g, '').replace(/'/g, "'"),
); // get the tick ' back again from HTMLified string
text = `${text.replace(matches[0], ` ${renderedKatex}`)}`;
} catch {
numInline -= 1;
}
matches = regex.exec(katexString);
}
} else {
try {
text = katex.renderToString(matches[2].replace(/'/g, "'"));
} catch (error) {
numInline -= 1;
}
}
}
}
return [text, numInline > 0];
}
renderer.paragraph = t => {
const [text, inline] = renderKatex(t);
return `<p class="${inline ? 'inline-katex' : ''}">${text}</p>`;
};
renderer.listitem = t => {
const [text, inline] = renderKatex(t);
return `<li class="${inline ? 'inline-katex' : ''}">${text}</li>`;
};
marked.setOptions({
renderer,
});
export default {
components: {
prompt: Prompt,
},
props: {
cell: {
type: Object,
required: true,
},
},
computed: {
markdown() {
return sanitize(marked(this.cell.source.join('').replace(/\\/g, '\\\\')), {
// allowedTags from GitLab's inline HTML guidelines
// https://docs.gitlab.com/ee/user/markdown.html#inline-html
ALLOWED_TAGS: [
'a',
'abbr',
'b',
'blockquote',
'br',
'code',
'dd',
'del',
'div',
'dl',
'dt',
'em',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'hr',
'i',
'img',
'ins',
'kbd',
'li',
'ol',
'p',
'pre',
'q',
'rp',
'rt',
'ruby',
's',
'samp',
'span',
'strike',
'strong',
'sub',
'summary',
'sup',
'table',
'tbody',
'td',
'tfoot',
'th',
'thead',
'tr',
'tt',
'ul',
'var',
],
ALLOWED_ATTR: ['class', 'style', 'href', 'src'],
});
},
},
};
</script>
<template>
<div class="cell text-cell">
<prompt />
<div class="markdown" v-html="markdown"></div>
</div>
</template>
<style>
/*
Importing the necessary katex stylesheet from the node_module folder rather
than copying the stylesheet into `app/assets/stylesheets/vendors` for
automatic importing via `app/assets/stylesheets/application.scss`. The reason
is that the katex stylesheet depends on many fonts that are in node_module
subfolders - moving all these fonts would make updating katex difficult.
*/
@import '~katex/dist/katex.min.css';
.markdown .katex {
display: block;
text-align: center;
}
.markdown .inline-katex .katex {
display: inline;
text-align: initial;
}
</style>
|
