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import katex from 'katex';
const inlineRule = /^(\${1,2})(?!\$)((?:\\.|[^\\\n])*?(?:\\.|[^\\\n\$]))\1(?=[\s?!\.,:？！。，：]|$)/;
const inlineRuleNonStandard = /^(\${1,2})(?!\$)((?:\\.|[^\\\n])*?(?:\\.|[^\\\n\$]))\1/; // Non-standard, even if there are no spaces before and after $ or $$, try to parse
const blockRule = /^(\${1,2})\n((?:\\[^]|[^\\])+?)\n\1(?:\n|$)/;
export default function(options = {}) {
return {
extensions: [
inlineKatex(options, createRenderer(options, false)),
blockKatex(options, createRenderer(options, true)),
],
};
}
function createRenderer(options, newlineAfter) {
return (token) => katex.renderToString(token.text, { ...options, displayMode: token.displayMode }) + (newlineAfter ? '\n' : '');
}
function inlineKatex(options, renderer) {
const nonStandard = options && options.nonStandard;
const ruleReg = nonStandard ? inlineRuleNonStandard : inlineRule;
return {
name: 'inlineKatex',
level: 'inline',
start(src) {
let index;
let indexSrc = src;
while (indexSrc) {
index = indexSrc.indexOf('$');
if (index === -1) {
return;
}
const f = nonStandard ? index > -1 : index === 0 || indexSrc.charAt(index - 1) === ' ';
if (f) {
const possibleKatex = indexSrc.substring(index);
if (possibleKatex.match(ruleReg)) {
return index;
}
}
indexSrc = indexSrc.substring(index + 1).replace(/^\$+/, '');
}
},
tokenizer(src, tokens) {
const match = src.match(ruleReg);
if (match) {
return {
type: 'inlineKatex',
raw: match[0],
text: match[2].trim(),
displayMode: match[1].length === 2,
};
}
},
renderer,
};
}
function blockKatex(options, renderer) {
return {
name: 'blockKatex',
level: 'block',
tokenizer(src, tokens) {
const match = src.match(blockRule);
if (match) {
return {
type: 'blockKatex',
raw: match[0],
text: match[2].trim(),
displayMode: match[1].length === 2,
};
}
},
renderer,
};
} |