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source dump of claude code
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2.4 kB · 96 lines
TypeScript
at main
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type CachedFileData = { content: string encoding: BufferEncoding mtime: number}
/** * A simple in-memory cache for file contents with automatic invalidation based on modification time. * This eliminates redundant file reads in FileEditTool operations. */class FileReadCache { private cache = new Map<string, CachedFileData>() private readonly maxCacheSize = 1000
/** * Reads a file with caching. Returns both content and encoding. * Cache key includes file path and modification time for automatic invalidation. */ readFile(filePath: string): { content: string; encoding: BufferEncoding } { const fs = getFsImplementation()
// Get file stats for cache invalidation let stats try { stats = fs.statSync(filePath) } catch (error) { // File was deleted, remove from cache and re-throw this.cache.delete(filePath) throw error }
const cacheKey = filePath const cachedData = this.cache.get(cacheKey)
// Check if we have valid cached data if (cachedData && cachedData.mtime === stats.mtimeMs) { return { content: cachedData.content, encoding: cachedData.encoding, } }
// Cache miss or stale data - read the file const encoding = detectFileEncoding(filePath) const content = fs .readFileSync(filePath, { encoding }) .replaceAll('\r\n', '\n')
// Update cache this.cache.set(cacheKey, { content, encoding, mtime: stats.mtimeMs, })
// Evict oldest entries if cache is too large if (this.cache.size > this.maxCacheSize) { const firstKey = this.cache.keys().next().value if (firstKey) { this.cache.delete(firstKey) } }
return { content, encoding } }
/** * Clears the entire cache. Useful for testing or memory management. */ clear(): void { this.cache.clear() }
/** * Removes a specific file from the cache. */ invalidate(filePath: string): void { this.cache.delete(filePath) }
/** * Gets cache statistics for debugging/monitoring. */ getStats(): { size: number; entries: string[] } { return { size: this.cache.size, entries: Array.from(this.cache.keys()), } }}
// Export a singleton instanceexport const fileReadCache = new FileReadCache()