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84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
// took from: https://github.com/sxyazi/marked-extended-latex
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// this has a peer dependency bug
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const CLASS_NAME = 'latex-b172fea480b'
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const extBlock = options => ({
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name: 'latex-block',
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level: 'block',
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start(src) {
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return src.match(/\$\$[^\$]/)?.index ?? -1
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},
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tokenizer(src, tokens) {
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const match = /^\$\$([^\$]+)\$\$/.exec(src)
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return match ? { type: 'latex-block', raw: match[0], formula: match[1] } : undefined
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},
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renderer(token) {
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if (!options.lazy) return options.render(token.formula, true)
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return `<span class="${CLASS_NAME}" block>${token.formula}</span>`
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},
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})
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const extInline = options => ({
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name: 'latex',
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level: 'inline',
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start(src) {
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return src.match(/\$[^\$]/)?.index ?? -1
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},
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tokenizer(src, tokens) {
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const match = /^\$([^\$]+)\$/.exec(src)
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return match ? { type: 'latex', raw: match[0], formula: match[1] } : undefined
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},
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renderer(token) {
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if (!options.lazy) return options.render(token.formula, false)
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return `<span class="${CLASS_NAME}">${token.formula}</span>`
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},
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})
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let observer
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/* istanbul ignore next */
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export default (options = {}) => {
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/* istanbul ignore next */
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if (options.lazy && options.env !== 'test') {
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observer = new IntersectionObserver(
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(entries, self) => {
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for (const entry of entries) {
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if (!entry.isIntersecting) {
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continue
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}
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const span = entry.target
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self.unobserve(span)
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Promise.resolve(options.render(span.innerText, span.hasAttribute('block'))).then(html => {
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span.innerHTML = html
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})
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span.classList.add('latex-rendered')
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}
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},
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{ threshold: 1.0 },
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)
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}
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return {
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extensions: [extBlock(options), extInline(options)],
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}
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}
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/* istanbul ignore next */
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export const observe = () => {
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if (!observer) {
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return
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}
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observer.disconnect()
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document.querySelectorAll(`span.${CLASS_NAME}:not(.latex-rendered)`).forEach(span => {
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observer.observe(span)
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})
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}
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/* istanbul ignore next */
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export const disconnect = () => {
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observer?.disconnect()
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}
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