${escapeHtml(source)}`;
}
katexCache.set(cacheKey, html);
if (katexCache.size > KATEX_CACHE_LIMIT) {
katexCache.delete(
katexCache.keys().next().value,
);
}
return html;
}
markdownRenderer.use(markdownItMath);
function markdownItMath(md) {
getKatexEngine();
const addToken = (
state,
content,
displayMode,
) => {
const token = state.push(
displayMode
? 'math_block'
: 'math_inline',
'math',
0,
);
token.content = content;
token.meta = { displayMode };
};
md.inline.ruler.before(
'escape',
'math_inline',
(state, silent) => {
const start = state.pos;
const source = state.src.slice(start);
let match = source.match(
/^\\\(([\s\S]+?)\\\)/,
);
if (!match) {
match = source.match(
/^\$([^$\n]+?)\$/,
);
}
if (!match) return false;
if (!silent) {
addToken(
state,
match[1],
false,
);
}
state.pos += match[0].length;
return true;
},
);
md.block.ruler.before(
'fence',
'math_block',
(state, startLine, endLine, silent) => {
const firstLine = state.getLines(
startLine,
startLine + 1,
state.tShift[startLine],
true,
).trim();
const opening =
firstLine === '\\['
? '\\]'
: firstLine === '$$'
? '$$'
: '';
if (!opening) return false;
let nextLine = startLine + 1;
const lines = [];
while (nextLine < endLine) {
const line = state.getLines(
nextLine,
nextLine + 1,
state.tShift[nextLine],
true,
);
if (line.trim() === opening) {
break;
}
lines.push(line);
nextLine += 1;
}
if (
nextLine >= endLine ||
state.getLines(
nextLine,
nextLine + 1,
state.tShift[nextLine],
true,
).trim() !== opening
) {
return false;
}
if (silent) return true;
addToken(
state,
lines.join(''),
true,
);
state.line = nextLine + 1;
return true;
},
);
md.renderer.rules.math_inline =
(tokens, index) =>
renderMathCached(
tokens[index].content,
false,
);
md.renderer.rules.math_block =
(tokens, index) =>
`${renderMathCached(
tokens[index].content,
true,
)}\n`;
}
if (typeof markdownitTaskLists === 'function') {
markdownRenderer.use(
markdownitTaskLists,
{ enabled: true },
);
}
if (typeof markdownitFootnote === 'function') {
markdownRenderer.use(markdownitFootnote);
}
const MERMAID_LIMITS = {
maxSourceLength: 8000,
maxLines: 200,
maxPerMessage: 20,
cacheSize: 30,
};
markdownRenderer.renderer.rules.fence =
(tokens, index, options, env = {}) => {
const token = tokens[index];
const language = token.info.trim().split(/\s+/)[0].toLowerCase();
if (language === 'mermaid') {
env.mermaidCount =
(env.mermaidCount || 0) + 1;
const lineCount = token.content
.split('\n')
.length;
const tooLarge =
token.content.length > MERMAID_LIMITS.maxSourceLength ||
lineCount > MERMAID_LIMITS.maxLines;
const tooMany =
env.mermaidCount > MERMAID_LIMITS.maxPerMessage;
const interactive =
env.mermaidEnabled !== false &&
!tooLarge &&
!tooMany;
const status = tooLarge
? '图表规模过大，已禁用渲染'
: tooMany
? '本条消息图表过多，已禁用渲染'
: env.mermaidEnabled === false
? '回答生成中，完成后可渲染'
: '点击渲染';
return `
${escapeHtml(token.content)}