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import katex from 'katex';
const DELIMITER_LIST = [
{ left: '$$', right: '$$', display: false },
{ left: '$', right: '$', display: false },
{ left: '\\pu{', right: '}', display: false },
{ left: '\\ce{', right: '}', display: false },
{ left: '\\(', right: '\\)', display: false },
{ left: '( ', right: ' )', display: false },
{ left: '\\[', right: '\\]', display: true },
{ left: '[ ', right: ' ]', display: true }
];
// const DELIMITER_LIST = [
// { left: '$$', right: '$$', display: false },
// { left: '$', right: '$', display: false },
// ];
// const inlineRule = /^(\${1,2})(?!\$)((?:\\.|[^\\\n])*?(?:\\.|[^\\\n\$]))\1(?=[\s?!\.,:？！。，：]|$)/;
// const blockRule = /^(\${1,2})\n((?:\\[^]|[^\\])+?)\n\1(?:\n|$)/;
let inlinePatterns = [];
let blockPatterns = [];
function escapeRegex(string) {
return string.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
}
function generateRegexRules(delimiters) {
delimiters.forEach((delimiter) => {
const { left, right } = delimiter;
// Ensure regex-safe delimiters
const escapedLeft = escapeRegex(left);
const escapedRight = escapeRegex(right);
// Inline pattern - Capture group $1, token content, followed by end delimiter and normal punctuation marks.
// Example: $text$
inlinePatterns.push(
`${escapedLeft}((?:\\\\.|[^\\\\\\n])*?(?:\\\\.|[^\\\\\\n${escapedRight}]))${escapedRight}`
);
// Block pattern - Starts and ends with the delimiter on new lines. Example:
// $$\ncontent here\n$$
blockPatterns.push(`${escapedLeft}\n((?:\\\\[^]|[^\\\\])+?)\n${escapedRight}`);
});
const inlineRule = new RegExp(`^(${inlinePatterns.join('|')})(?=[\\s?!.,:？！。，：]|$)`, 'u');
const blockRule = new RegExp(`^(${blockPatterns.join('|')})(?:\n|$)`, 'u');
return { inlineRule, blockRule };
}
const { inlineRule, blockRule } = generateRegexRules(DELIMITER_LIST);
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 ruleReg = inlineRule;
return {
name: 'inlineKatex',
level: 'inline',
start(src) {
let index;
let indexSrc = src;
while (indexSrc) {
index = indexSrc.indexOf('$');
if (index === -1) {
return;
}
const f = 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) {
const text = match
.slice(2)
.filter((item) => item)
.find((item) => item.trim());
return {
type: 'inlineKatex',
raw: match[0],
text: text
};
}
},
renderer
};
}
function blockKatex(options, renderer) {
return {
name: 'blockKatex',
level: 'block',
tokenizer(src, tokens) {
const match = src.match(blockRule);
if (match) {
const text = match
.slice(2)
.filter((item) => item)
.find((item) => item.trim());
return {
type: 'blockKatex',
raw: match[0],
text: text
};
}
},
renderer
};
}
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