@lobehub/ui/es/Markdown/SyntaxMarkdown/StreamdownRender.mjs.map

Lobe UI is an open-source UI component library for building AIGC web apps

{"version":3,"file":"StreamdownRender.mjs","names":[],"sources":["../../../src/Markdown/SyntaxMarkdown/StreamdownRender.tsx"],"sourcesContent":["'use client';\n\nimport { marked } from 'marked';\nimport {\n  memo,\n  Profiler,\n  type ProfilerOnRenderCallback,\n  useCallback,\n  useEffect,\n  useId,\n  useMemo,\n  useRef,\n} from 'react';\nimport Markdown, { type Options } from 'react-markdown';\nimport remend from 'remend';\nimport type { Pluggable, PluggableList } from 'unified';\n\nimport {\n  useMarkdownComponents,\n  useMarkdownContent,\n  useMarkdownRehypePlugins,\n  useMarkdownRemarkPlugins,\n} from '@/hooks/useMarkdown';\nimport { useMarkdownContext } from '@/Markdown/components/MarkdownProvider';\nimport { rehypeStreamAnimated } from '@/Markdown/plugins/rehypeStreamAnimated';\nimport { useStreamdownProfiler } from '@/Markdown/streamProfiler';\n\nimport { resolveBlockAnimationMeta } from './streamAnimationMeta';\nimport { styles } from './style';\nimport { useSmoothStreamContent } from './useSmoothStreamContent';\nimport { type BlockInfo, useStreamQueue } from './useStreamQueue';\n\nconst STREAM_FADE_DURATION = 280;\nconst REVEALED_STREAM_PLUGIN: Pluggable = [rehypeStreamAnimated, { revealed: true }];\n\nfunction countChars(text: string): number {\n  return [...text].length;\n}\n\nfunction getNow(): number {\n  return typeof performance === 'undefined' ? Date.now() : performance.now();\n}\n\nconst isRecord = (value: unknown): value is Record<string, unknown> =>\n  typeof value === 'object' && value !== null;\n\nconst isDeepEqualValue = (a: unknown, b: unknown): boolean => {\n  if (a === b) return true;\n\n  if (Array.isArray(a) || Array.isArray(b)) {\n    if (!Array.isArray(a) || !Array.isArray(b)) return false;\n    if (a.length !== b.length) return false;\n    for (let i = 0; i < a.length; i++) {\n      if (!isDeepEqualValue(a[i], b[i])) return false;\n    }\n    return true;\n  }\n\n  if (!isRecord(a) || !isRecord(b)) return false;\n\n  const keysA = Object.keys(a);\n  const keysB = Object.keys(b);\n  if (keysA.length !== keysB.length) return false;\n\n  for (const key of keysA) {\n    if (!isDeepEqualValue(a[key], b[key])) return false;\n  }\n\n  return true;\n};\n\nconst isSamePlugin = (prevPlugin: Pluggable, nextPlugin: Pluggable): boolean => {\n  const prevTuple = Array.isArray(prevPlugin) ? prevPlugin : [prevPlugin];\n  const nextTuple = Array.isArray(nextPlugin) ? nextPlugin : [nextPlugin];\n\n  if (prevTuple.length !== nextTuple.length) return false;\n  if (prevTuple[0] !== nextTuple[0]) return false;\n\n  return isDeepEqualValue(prevTuple.slice(1), nextTuple.slice(1));\n};\n\nconst isSamePlugins = (\n  prevPlugins?: PluggableList | null,\n  nextPlugins?: PluggableList | null,\n): boolean => {\n  if (prevPlugins === nextPlugins) return true;\n  if (!prevPlugins || !nextPlugins) return !prevPlugins && !nextPlugins;\n  if (prevPlugins.length !== nextPlugins.length) return false;\n\n  for (let i = 0; i < prevPlugins.length; i++) {\n    if (!isSamePlugin(prevPlugins[i], nextPlugins[i])) return false;\n  }\n\n  return true;\n};\n\nconst useStablePlugins = (plugins: PluggableList): PluggableList => {\n  const stableRef = useRef<PluggableList>(plugins);\n\n  if (!isSamePlugins(stableRef.current, plugins)) {\n    stableRef.current = plugins;\n  }\n\n  return stableRef.current;\n};\n\nconst StreamdownBlock = memo<Options>(\n  ({ children, ...rest }) => {\n    return <Markdown {...rest}>{children}</Markdown>;\n  },\n  (prevProps, nextProps) =>\n    prevProps.children === nextProps.children &&\n    prevProps.components === nextProps.components &&\n    isSamePlugins(prevProps.rehypePlugins, nextProps.rehypePlugins) &&\n    isSamePlugins(prevProps.remarkPlugins, nextProps.remarkPlugins),\n);\n\nStreamdownBlock.displayName = 'StreamdownBlock';\n\nexport const StreamdownRender = memo<Options>(({ children, ...rest }) => {\n  const { streamSmoothingPreset = 'balanced' } = useMarkdownContext();\n  const profiler = useStreamdownProfiler();\n  const escapedContent = useMarkdownContent(children || '');\n  const components = useMarkdownComponents();\n  const baseRehypePlugins = useStablePlugins(useMarkdownRehypePlugins());\n  const remarkPlugins = useStablePlugins(useMarkdownRemarkPlugins());\n  const generatedId = useId();\n  const smoothedContent = useSmoothStreamContent(\n    typeof escapedContent === 'string' ? escapedContent : '',\n    { preset: streamSmoothingPreset },\n  );\n\n  const processedContentResult = useMemo(() => {\n    const start = profiler ? getNow() : 0;\n    const value = remend(smoothedContent);\n\n    return {\n      durationMs: profiler ? getNow() - start : 0,\n      value,\n    };\n  }, [profiler, smoothedContent]);\n  const processedContent = processedContentResult.value;\n\n  const blocksResult = useMemo(() => {\n    const start = profiler ? getNow() : 0;\n    const tokens = marked.lexer(processedContent);\n    let offset = 0;\n\n    const value = tokens.map((token) => {\n      const block = { content: token.raw, startOffset: offset };\n      offset += token.raw.length;\n      return block;\n    });\n\n    return {\n      durationMs: profiler ? getNow() - start : 0,\n      value,\n    };\n  }, [processedContent, profiler]);\n  const blocks: BlockInfo[] = blocksResult.value;\n\n  const { getBlockState, charDelay } = useStreamQueue(blocks);\n  const blockCharDelayRef = useRef<Map<number, number>>(new Map());\n  const blockBirthsRef = useRef<Map<number, number[]>>(new Map());\n\n  const renderNow = getNow();\n\n  const birthsResult = useMemo(() => {\n    const start = profiler ? getNow() : 0;\n    const nextBirths = new Map<number, number[]>();\n    const prevBirths = blockBirthsRef.current;\n\n    for (const [index, block] of blocks.entries()) {\n      const state = getBlockState(index);\n      // Queued blocks are not rendered. Defer birth assignment so that\n      // when the block later transitions to animating/streaming, its\n      // chars start fading from that moment instead of having already\n      // \"aged out\" of the fade window.\n      if (state === 'queued') continue;\n\n      const blockCharCount = countChars(block.content);\n      const prev = prevBirths.get(block.startOffset);\n      let arr: number[];\n\n      if (prev && prev.length === blockCharCount) {\n        arr = prev;\n      } else if (prev && prev.length > blockCharCount) {\n        // Block content shrunk (stream restart or upstream rewrite).\n        arr = prev.slice(0, blockCharCount);\n      } else {\n        arr = prev ? prev.slice() : [];\n        const startIdx = arr.length;\n        // Chain each new char monotonically after the previous one so fades\n        // never race out of order. Cap how far the fade queue can run ahead\n        // of renderNow to prevent stream-faster-than-fade producing seconds\n        // of invisible backlog at the tail.\n        const cap = renderNow + STREAM_FADE_DURATION;\n        for (let i = startIdx; i < blockCharCount; i++) {\n          const prevBirth = i > 0 ? (arr[i - 1] as number) : renderNow - charDelay;\n          const chained = prevBirth + charDelay;\n          arr.push(Math.min(cap, Math.max(chained, renderNow)));\n        }\n      }\n\n      nextBirths.set(block.startOffset, arr);\n    }\n\n    return {\n      durationMs: profiler ? getNow() - start : 0,\n      value: nextBirths,\n    };\n  }, [blocks, charDelay, getBlockState, profiler, renderNow]);\n  const birthsForRender = birthsResult.value;\n\n  useEffect(() => {\n    if (!profiler) return;\n\n    profiler.recordCalculation({\n      durationMs: processedContentResult.durationMs,\n      name: 'content-normalize',\n      textLength: processedContent.length,\n    });\n  }, [processedContent.length, processedContentResult.durationMs, profiler]);\n\n  useEffect(() => {\n    if (!profiler) return;\n\n    profiler.recordCalculation({\n      durationMs: blocksResult.durationMs,\n      itemCount: blocks.length,\n      name: 'block-lex',\n      textLength: processedContent.length,\n    });\n  }, [blocks.length, blocksResult.durationMs, processedContent.length, profiler]);\n\n  useEffect(() => {\n    if (!profiler) return;\n\n    profiler.recordCalculation({\n      durationMs: birthsResult.durationMs,\n      itemCount: blocks.length,\n      name: 'block-births',\n      textLength: processedContent.length,\n    });\n  }, [birthsResult.durationMs, blocks.length, processedContent.length, profiler]);\n\n  const blockAnimationMetaResult = useMemo(() => {\n    const nextBlockCharDelay = new Map<number, number>();\n    const blockAnimationMeta = new Map<number, ReturnType<typeof resolveBlockAnimationMeta>>();\n\n    for (const [index, block] of blocks.entries()) {\n      const state = getBlockState(index);\n      const births = birthsForRender.get(block.startOffset);\n      const lastBirthTs = births && births.length > 0 ? (births.at(-1) ?? renderNow) : renderNow;\n      const lastElapsedMs = renderNow - lastBirthTs;\n      const animationMeta = resolveBlockAnimationMeta({\n        currentCharDelay: charDelay,\n        fadeDuration: STREAM_FADE_DURATION,\n        lastElapsedMs,\n        previousCharDelay: blockCharDelayRef.current.get(block.startOffset),\n        state,\n      });\n\n      nextBlockCharDelay.set(block.startOffset, animationMeta.charDelay);\n      blockAnimationMeta.set(block.startOffset, animationMeta);\n    }\n\n    return {\n      blockAnimationMeta,\n      blockCharDelay: nextBlockCharDelay,\n    };\n  }, [birthsForRender, blocks, charDelay, getBlockState, renderNow]);\n\n  useEffect(() => {\n    blockCharDelayRef.current = blockAnimationMetaResult.blockCharDelay;\n    blockBirthsRef.current = birthsForRender;\n  }, [birthsForRender, blockAnimationMetaResult.blockCharDelay]);\n\n  const handleRootRender = useCallback<ProfilerOnRenderCallback>(\n    (_, phase, actualDuration, baseDuration) => {\n      profiler?.recordRootCommit({\n        actualDuration,\n        baseDuration,\n        blockCount: blocks.length,\n        phase,\n        textLength: processedContent.length,\n      });\n    },\n    [blocks.length, processedContent.length, profiler],\n  );\n\n  const handleBlockRender = useCallback<ProfilerOnRenderCallback>(\n    (id, phase, actualDuration, baseDuration) => {\n      if (!profiler) return;\n\n      const [, indexText, offsetText] = id.split(':');\n      const blockIndex = Number(indexText);\n\n      if (!Number.isFinite(blockIndex)) return;\n\n      const block = blocks[blockIndex];\n      if (!block) return;\n\n      profiler.recordBlockCommit({\n        actualDuration,\n        baseDuration,\n        blockChars: countChars(block.content),\n        blockIndex,\n        blockKey: offsetText ?? String(block.startOffset),\n        phase,\n        state: getBlockState(blockIndex),\n      });\n    },\n    [blocks, getBlockState, profiler],\n  );\n\n  const content = (\n    <div className={styles.animated}>\n      {blocks.map((block, index) => {\n        const state = getBlockState(index);\n        if (state === 'queued') return null;\n        const animationMeta = blockAnimationMetaResult.blockAnimationMeta.get(block.startOffset);\n        if (!animationMeta) return null;\n\n        const births = birthsForRender.get(block.startOffset);\n        const plugins: Pluggable[] = animationMeta.settled\n          ? [...baseRehypePlugins, REVEALED_STREAM_PLUGIN]\n          : [\n              ...baseRehypePlugins,\n              [\n                rehypeStreamAnimated,\n                {\n                  births,\n                  fadeDuration: STREAM_FADE_DURATION,\n                  nowMs: renderNow,\n                },\n              ],\n            ];\n\n        const key = `${generatedId}-${block.startOffset}`;\n        const blockNode = (\n          <StreamdownBlock\n            {...rest}\n            components={components}\n            rehypePlugins={plugins}\n            remarkPlugins={remarkPlugins}\n          >\n            {block.content}\n          </StreamdownBlock>\n        );\n\n        if (!profiler) {\n          return (\n            <StreamdownBlock\n              {...rest}\n              components={components}\n              key={key}\n              rehypePlugins={plugins}\n              remarkPlugins={remarkPlugins}\n            >\n              {block.content}\n            </StreamdownBlock>\n          );\n        }\n\n        return (\n          <Profiler\n            id={`streamdown-block:${index}:${block.startOffset}`}\n            key={key}\n            onRender={handleBlockRender}\n          >\n            {blockNode}\n          </Profiler>\n        );\n      })}\n    </div>\n  );\n\n  if (!profiler) return content;\n\n  return (\n    <Profiler id={'streamdown-root'} onRender={handleRootRender}>\n      {content}\n    </Profiler>\n  );\n});\n\nStreamdownRender.displayName = 'StreamdownRender';\n\nexport default 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