256 lines
10 KiB
TypeScript
256 lines
10 KiB
TypeScript
import { ReactNode, useCallback, useEffect, useRef } from 'react'
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import { Message } from '@/api/lightrag'
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import useTheme from '@/hooks/useTheme'
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import Button from '@/components/ui/Button'
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import { cn } from '@/lib/utils'
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import ReactMarkdown from 'react-markdown'
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import remarkGfm from 'remark-gfm'
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import rehypeReact from 'rehype-react'
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import remarkMath from 'remark-math'
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import mermaid from 'mermaid'
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import type { Element } from 'hast'
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import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter'
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import { oneLight, oneDark } from 'react-syntax-highlighter/dist/cjs/styles/prism'
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import { LoaderIcon, CopyIcon } from 'lucide-react'
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import { useTranslation } from 'react-i18next'
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export type MessageWithError = Message & {
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isError?: boolean
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}
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export const ChatMessage = ({ message }: { message: MessageWithError }) => {
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const { t } = useTranslation()
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// Remove extra spaces around bold text
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message.content = message.content.replace(/\* {3}/g, '').replace(/ {4}\*\*/g, '**')
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const handleCopyMarkdown = useCallback(async () => {
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if (message.content) {
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try {
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await navigator.clipboard.writeText(message.content)
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} catch (err) {
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console.error(t('chat.copyError'), err)
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}
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}
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}, [message, t]) // Added t to dependency array
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return (
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<div
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className={`max-w-[80%] rounded-lg px-4 py-2 ${
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message.role === 'user'
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? 'bg-primary text-primary-foreground'
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: message.isError
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? 'bg-red-100 text-red-600 dark:bg-red-950 dark:text-red-400'
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: 'bg-muted'
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}`}
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>
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<pre className="relative break-words whitespace-pre-wrap">
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<ReactMarkdown
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className="dark:prose-invert max-w-none text-base text-sm"
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remarkPlugins={[remarkGfm, remarkMath]}
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rehypePlugins={[rehypeReact]}
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skipHtml={false}
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components={{
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code: CodeHighlight
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}}
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>
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{message.content}
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</ReactMarkdown>
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{message.role === 'assistant' && message.content && message.content.length > 0 && ( // Added check for message.content existence
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<Button
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onClick={handleCopyMarkdown}
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className="absolute right-0 bottom-0 size-6 rounded-md opacity-20 transition-opacity hover:opacity-100"
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tooltip={t('retrievePanel.chatMessage.copyTooltip')}
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variant="default"
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size="icon"
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>
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<CopyIcon className="size-4" /> {/* Explicit size */}
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</Button>
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)}
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</pre>
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{message.content === '' && <LoaderIcon className="animate-spin duration-2000" />} {/* Check for empty string specifically */}
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</div>
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)
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}
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interface CodeHighlightProps {
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inline?: boolean
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className?: string
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children?: ReactNode
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node?: Element // Keep node for inline check
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}
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// Helper function remains the same
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const isInlineCode = (node?: Element): boolean => {
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if (!node || !node.children) return false;
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const textContent = node.children
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.filter((child) => child.type === 'text')
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.map((child) => (child as any).value)
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.join('');
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// Consider inline if it doesn't contain newline or is very short
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return !textContent.includes('\n') || textContent.length < 40;
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};
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const CodeHighlight = ({ className, children, node, ...props }: CodeHighlightProps) => {
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const { theme } = useTheme();
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const match = className?.match(/language-(\w+)/);
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const language = match ? match[1] : undefined;
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const inline = isInlineCode(node); // Use the helper function
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const mermaidRef = useRef<HTMLDivElement>(null);
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const debounceTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null); // Use ReturnType for better typing
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// Handle Mermaid rendering with debounce
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useEffect(() => {
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// Clear any existing timer when dependencies change
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if (debounceTimerRef.current) {
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clearTimeout(debounceTimerRef.current);
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}
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if (language === 'mermaid' && mermaidRef.current) {
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const container = mermaidRef.current; // Capture ref value for use inside timeout/callbacks
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// Set a new timer to render after a short delay
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debounceTimerRef.current = setTimeout(() => {
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// Ensure container still exists when timer fires
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if (!container) return;
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try {
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// Initialize mermaid config (safe to call multiple times)
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mermaid.initialize({
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startOnLoad: false,
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theme: theme === 'dark' ? 'dark' : 'default',
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securityLevel: 'loose',
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});
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// Show loading indicator while processing
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container.innerHTML = '<div class="flex justify-center items-center p-4"><svg class="animate-spin h-5 w-5 text-primary" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path></svg></div>';
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// Preprocess mermaid content
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const rawContent = String(children).replace(/\n$/, '').trim(); // Trim whitespace as well
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// Heuristic check for potentially complete graph definition
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// Looks for graph type declaration and some content beyond it.
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const looksPotentiallyComplete = rawContent.length > 10 && (
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rawContent.startsWith('graph') ||
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rawContent.startsWith('sequenceDiagram') ||
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rawContent.startsWith('classDiagram') ||
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rawContent.startsWith('stateDiagram') ||
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rawContent.startsWith('gantt') ||
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rawContent.startsWith('pie') ||
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rawContent.startsWith('flowchart') ||
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rawContent.startsWith('erDiagram')
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);
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if (!looksPotentiallyComplete) {
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console.log('Mermaid content might be incomplete, skipping render attempt:', rawContent);
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// Keep loading indicator or show a message
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// container.innerHTML = '<p class="text-sm text-muted-foreground">Waiting for complete diagram...</p>';
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return; // Don't attempt to render potentially incomplete content
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}
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const processedContent = rawContent
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.split('\n')
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.map(line => {
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const trimmedLine = line.trim();
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// Keep subgraph processing
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if (trimmedLine.startsWith('subgraph')) {
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const parts = trimmedLine.split(' ');
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if (parts.length > 1) {
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const title = parts.slice(1).join(' ').replace(/["']/g, '');
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return `subgraph "${title}"`;
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}
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}
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return trimmedLine;
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})
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.filter(line => !line.trim().startsWith('linkStyle')) // Keep filtering linkStyle
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.join('\n');
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const mermaidId = `mermaid-${Date.now()}`;
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mermaid.render(mermaidId, processedContent)
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.then(({ svg, bindFunctions }) => {
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// Check ref again inside async callback
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// Ensure the container is still the one we intended to update
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if (mermaidRef.current === container) {
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container.innerHTML = svg;
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if (bindFunctions) {
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try { // Add try-catch around bindFunctions as it can also throw
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bindFunctions(container);
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} catch (bindError) {
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console.error('Mermaid bindFunctions error:', bindError);
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// Optionally display a message in the container
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container.innerHTML += '<p class="text-orange-500 text-xs">Diagram interactions might be limited.</p>';
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}
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}
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} else {
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console.log('Mermaid container changed before rendering completed.');
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}
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})
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.catch(error => {
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console.error('Mermaid rendering promise error (debounced):', error);
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console.error('Failed content (debounced):', processedContent);
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if (mermaidRef.current === container) {
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const errorMessage = error instanceof Error ? error.message : String(error);
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// Make error display more robust
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const errorPre = document.createElement('pre');
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errorPre.className = 'text-red-500 text-xs whitespace-pre-wrap break-words';
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errorPre.textContent = `Mermaid diagram error: ${errorMessage}\n\nContent:\n${processedContent}`;
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container.innerHTML = ''; // Clear previous content
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container.appendChild(errorPre);
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}
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});
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} catch (error) {
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console.error('Mermaid synchronous error (debounced):', error);
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console.error('Failed content (debounced):', String(children));
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if (mermaidRef.current === container) {
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const errorMessage = error instanceof Error ? error.message : String(error);
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const errorPre = document.createElement('pre');
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errorPre.className = 'text-red-500 text-xs whitespace-pre-wrap break-words';
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errorPre.textContent = `Mermaid diagram setup error: ${errorMessage}`;
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container.innerHTML = ''; // Clear previous content
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container.appendChild(errorPre);
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}
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}
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}, 300); // 300ms debounce delay
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}
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// Cleanup function to clear the timer
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return () => {
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if (debounceTimerRef.current) {
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clearTimeout(debounceTimerRef.current);
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}
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};
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}, [language, children, theme]); // Dependencies
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// Render based on language type
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if (language === 'mermaid') {
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// Container for Mermaid diagram
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return <div className="mermaid-diagram-container my-4 overflow-x-auto" ref={mermaidRef}></div>;
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}
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// Handle non-Mermaid code blocks
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return !inline ? (
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<SyntaxHighlighter
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style={theme === 'dark' ? oneDark : oneLight}
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PreTag="div" // Use div for block code
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language={language}
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{...props}
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>
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{String(children).replace(/\n$/, '')}
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</SyntaxHighlighter>
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) : (
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// Handle inline code
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<code
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className={cn(className, 'mx-1 rounded-sm bg-muted px-1 py-0.5 text-sm')} // Adjusted styling for inline code
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{...props}
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>
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{children}
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</code>
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);
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};
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