feat(chat): render streaming code blocks

static/src/composables/useMarkdownRenderer.ts

@@ -11,6 +11,7 @@ import rehypeStringify from 'rehype-stringify';
 import { visit } from 'unist-util-visit';
 
 let latexRenderTimer: number | null = null;
+let streamingCodeHighlightTimer: number | null = null;
 const markdownCache = new Map<string, string>();
 let showHtmlDebugCount = 0;
 const SHOW_HTML_DEBUG_MAX = 500;
@@ -395,17 +396,14 @@ function buildCacheKey(text: string): string {
 }
 
 function wrapCodeBlocks(html: string, isStreaming = false) {
-  if (isStreaming) {
-    return html;
-  }
-
   let counter = 0;
   return html.replace(
     /<pre><code([^>]*)>([\s\S]*?)<\/code><\/pre>/g,
     (match, attributes, content) => {
-      const langMatch = attributes.match(/class="[^"]*language-(\w+)/);
+      const langMatch = attributes.match(/class="[^"]*language-([\w-]+)/);
       const language = langMatch ? langMatch[1] : 'text';
-      const blockId = `code-${stableHash(`${attributes}|${content}|${counter++}`)}`;
+      const blockId = `code-${stableHash(`${attributes}|${counter++}`)}`;
+      const streamingAttr = isStreaming ? ' data-streaming="1"' : '';
       const escapedContent = content
         .replace(/&/g, '&amp;')
         .replace(/</g, '&lt;')
@@ -413,7 +411,7 @@ function wrapCodeBlocks(html: string, isStreaming = false) {
         .replace(/"/g, '&quot;');
 
       return `
-            <div class="code-block-wrapper">
+            <div class="code-block-wrapper"${streamingAttr} data-md-code-block="1">
                 <div class="code-block-header">
                     <span class="code-language">${language}</span>
                     <button class="copy-code-btn" data-code="${blockId}" title="复制代码" aria-label="复制代码"></button>
@@ -424,6 +422,26 @@ function wrapCodeBlocks(html: string, isStreaming = false) {
   );
 }
 
+function scheduleStreamingCodeHighlight() {
+  if (typeof window === 'undefined') return;
+  if (streamingCodeHighlightTimer !== null) return;
+
+  streamingCodeHighlightTimer = window.setTimeout(() => {
+    streamingCodeHighlightTimer = null;
+
+    if (typeof Prism === 'undefined') return;
+
+    const codeBlocks = document.querySelectorAll('.code-block-wrapper[data-streaming="1"] pre code');
+    codeBlocks.forEach((block) => {
+      try {
+        Prism.highlightElement(block as HTMLElement);
+      } catch (error) {
+        console.warn('流式代码高亮失败:', error);
+      }
+    });
+  }, 120);
+}
+
 function renderMarkdownToHtml(text: string): string {
   const file = markdownProcessor.processSync(text);
   return String(file);
@@ -460,6 +478,10 @@ export function renderMarkdown(text: string, isStreaming = false) {
   }
   html = wrapCodeBlocks(html, isStreaming);
 
+  if (isStreaming) {
+    scheduleStreamingCodeHighlight();
+  }
+
   if (!isStreaming && text.length < 10000) {
     const cacheKey = buildCacheKey(text);
     markdownCache.set(cacheKey, html);

static/src/styles/components/chat/_chat-area.scss

@@ -1371,6 +1371,10 @@ show-html:not([data-rendered='1'])[ratio='3:4'] {
   box-shadow: none;
 }
 
+.code-block-wrapper[data-streaming='1'] {
+  min-height: 92px;
+}
+
 .code-block-header {
   min-height: 44px;
   background: var(--theme-surface-strong);
@@ -1448,6 +1452,10 @@ show-html:not([data-rendered='1'])[ratio='3:4'] {
   box-sizing: border-box;
 }
 
+.code-block-wrapper[data-streaming='1'] pre {
+  min-height: 40px;
+}
+
 .code-block-wrapper pre code {
   background: transparent !important;
   padding: 0 !important;