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21ad36a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | import { CodeToTokenTransformStream, type RecallToken } from '@shikijs/stream';
import { ShikiStreamRenderer } from '@shikijs/stream/react';
import type { ThemedToken } from 'shiki/core';
import { useEffect, useRef, useState } from 'react';
import {
codeThemeName,
getCodeHighlighter,
normalizeCodeLanguage,
type CodeTheme,
} from '../../lib/code-highlighter';
interface StreamingCodeBlockProps {
code: string;
language: string;
theme: CodeTheme;
complete: boolean;
}
export function StreamingCodeBlock({
code,
language,
theme,
complete,
}: StreamingCodeBlockProps) {
const normalizedLanguage = normalizeCodeLanguage(language);
const [revision, setRevision] = useState(0);
const [tokenStream, setTokenStream] = useState<ReadableStream<ThemedToken | RecallToken> | null>(null);
const [highlightFailed, setHighlightFailed] = useState(false);
const writerRef = useRef<WritableStreamDefaultWriter<string> | null>(null);
const writtenRef = useRef('');
const closedRef = useRef(false);
const codeRef = useRef(code);
const completeRef = useRef(complete);
const queueRef = useRef<Promise<void>>(Promise.resolve());
codeRef.current = code;
completeRef.current = complete;
const queueWrite = (
writer: WritableStreamDefaultWriter<string>,
chunk: string,
closeAfter: boolean,
) => {
queueRef.current = queueRef.current
.then(async () => {
if (chunk) await writer.write(chunk);
if (closeAfter && !closedRef.current) {
closedRef.current = true;
await writer.close();
}
})
.catch(() => {
if (writerRef.current === writer) {
writerRef.current = null;
setHighlightFailed(true);
}
});
};
useEffect(() => {
let disposed = false;
let writer: WritableStreamDefaultWriter<string> | null = null;
setTokenStream(null);
setHighlightFailed(false);
writtenRef.current = '';
closedRef.current = false;
queueRef.current = Promise.resolve();
void getCodeHighlighter(normalizedLanguage)
.then((highlighter) => {
if (disposed) return;
const transform = new CodeToTokenTransformStream({
highlighter,
lang: normalizedLanguage,
theme: codeThemeName(theme),
allowRecalls: true,
});
writer = transform.writable.getWriter();
writerRef.current = writer;
const currentCode = codeRef.current;
writtenRef.current = currentCode;
setTokenStream(transform.readable);
queueWrite(writer, currentCode, completeRef.current);
})
.catch(() => {
if (!disposed) setHighlightFailed(true);
});
return () => {
disposed = true;
if (writer && writerRef.current === writer) writerRef.current = null;
if (writer && !closedRef.current) {
closedRef.current = true;
void writer.close().catch(() => undefined);
}
};
}, [normalizedLanguage, revision, theme]);
useEffect(() => {
const writer = writerRef.current;
if (!writer || closedRef.current) return;
const written = writtenRef.current;
if (!code.startsWith(written)) {
writerRef.current = null;
closedRef.current = true;
void writer.close().catch(() => undefined);
setRevision((current) => current + 1);
return;
}
const delta = code.slice(written.length);
writtenRef.current = code;
if (delta || complete) queueWrite(writer, delta, complete);
}, [code, complete]);
const label = language.trim() || 'plain text';
const useFallback = !tokenStream || highlightFailed;
return (
<figure
className="code-block"
data-language={normalizedLanguage}
data-code-complete={complete ? 'true' : 'false'}
>
<figcaption>
<span>{label}</span>
{!complete && <span className="code-stream-state"><i /> streaming</span>}
</figcaption>
{useFallback
? <pre className="code-fallback"><code>{code}</code></pre>
: <ShikiStreamRenderer stream={tokenStream} />}
</figure>
);
}
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