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@tajpure
Created August 14, 2016 10:44
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Save tajpure/47c65cf72c44cb16f3a5df0ebc045f2f to your computer and use it in GitHub Desktop.
Support katex for marked.
const renderer = new marked.Renderer()
let originParagraph = renderer.paragraph.bind(renderer)
renderer.paragraph = (text) => {
const blockRegex = /\$\$[^\$]*\$\$/g
const inlineRegex = /\$[^\$]*\$/g
let blockExprArray = text.match(blockRegex)
let inlineExprArray = text.match(inlineRegex)
for (let i in blockExprArray) {
const expr = blockExprArray[i]
const result = renderMathsExpression(expr)
text = text.replace(expr, result)
}
for (let i in inlineExprArray) {
const expr = inlineExprArray[i]
const result = renderMathsExpression(expr)
text = text.replace(expr, result)
}
return originParagraph(text)
}
function renderMathsExpression (expr) {
if (expr[0] === '$' && expr[expr.length - 1] === '$') {
let displayStyle = false
expr = expr.substr(1, expr.length - 2)
if (expr[0] === '$' && expr[expr.length - 1] === '$') {
displayStyle = true
expr = expr.substr(1, expr.length - 2)
}
let html = null
try {
html = katex.renderToString(expr)
} catch (e) {
console.err(e)
}
if (displayStyle && html) {
html = html.replace(/class="katex"/g, 'class="katex katex-block" style="display: block;"')
}
return html
} else {
return null
}
}
marked.setOptions({renderer: renderer})
@olivren
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olivren commented Mar 5, 2022

Hi!

This bridge code is working well, thanks a lot.
I'd like to use the code in this gist in a project. Could you apply a license on it please? Just commenting "this is MIT" or whatever is enough.
Thanks again.

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