ds-markdown/es/utils/remarkMathBracket.js

> 🚀 React Markdown 打字动画组件，提供现代聊天界面效果

import { visit } from 'unist-util-visit';
/**
 * remark plugin: Convert \[...\] to $$...$$, \(...\) to $...$, so that remark-math can recognize them.
 */
const remarkMathBracket = () => (tree, file) => {
    visit(tree, 'text', (node) => {
        const value = node.value;
        if (typeof value === 'string') {
            node.value = replaceMathBracket(value);
        }
    });
};
/**
 * Convert bracket-formatted math formulas to dollar sign format
 * Supports the following conversions:
 * - \(...\) → $...$ (inline formula)
 * - \[...\] → $$...$$ (block formula)
 *
 * Special handling:
 * - If text contains Markdown links, skip conversion to avoid misprocessing
 * - Use placeholder mechanism to protect brackets inside block formulas from being mis-converted
 *
 * @param value String to convert
 * @returns Converted string
 */
export const replaceMathBracket = (value) => {
    // 1. Extract all block formula content, temporarily replace with placeholder, [...]
    const blockMatches = [];
    let replaced = value.replace(/\\+\[([\s\S]+?)\\+\]/g, (_m, p1) => {
        blockMatches.push(p1);
        return `__BLOCK_MATH_${blockMatches.length - 1}__`;
    });
    // Also need to support $$ xxxx $$ format
    replaced = replaced.replace(/\$\$([\s\S]+?)\$\$/g, (_m, p1) => {
        blockMatches.push(p1);
        return `__BLOCK_MATH_${blockMatches.length - 1}__`;
    });
    // 2. Replace ( ... ) outside block formulas with $...$
    replaced = replaced.replace(/\\+\(([^)]+?)\\+\)/g, (_m, p1) => {
        return '$' + p1 + '$';
    });
    // 3. Restore block formula content, keep internal parentheses unchanged
    replaced = replaced.replace(/__BLOCK_MATH_(\d+)__/g, (_m, idx) => {
        return '$$' + blockMatches[Number(idx)] + '$$';
    });
    return replaced;
};
export default remarkMathBracket;
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