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<h1><a href="../../../index.html">All files</a> / <a href="index.html">src/artifacts/scanner</a> project_scanner.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Project Scanner
*
* Multi-file scanning infrastructure with parallel parsing and intelligent caching.
*
* Performance targets:
* - 500 files in <5s (with parallel parsing)
* - Memory usage <100MB
* - 100% file discovery recall
*
* Architecture:
* - Serial mode: Single-threaded parsing (fallback)
* - Parallel mode: Worker thread pool (8 workers on 8-core CPU)
* - Incremental mode: Cache-aware parsing (skip unchanged files)
*
* @module scanner/project_scanner
*/
import { Worker } from 'worker_threads';
import { readdirSync, statSync } from 'fs';
import { join, resolve, extname, dirname } from 'path';
import { cpus } from 'os';
import { EventEmitter } from 'events';
import { TreeSitterBridge } from '../parsers/tree_sitter_bridge.js';
import { GraphCacheManager } from './cache_manager.js';
import type {
ASTForest,
ASTWithMetadata,
ScanMode,
ScanStats,
WorkerPayload,
WorkerResult,
} from './types.js';
/**
* Scans Godot projects for GDScript files and parses ASTs in parallel.
*
* @fires project:scan_started - Emitted when scanning begins
* @fires project:scan_completed - Emitted when scanning completes successfully
* @fires project:scan_failed - Emitted when scanning fails
* @fires project:scan_progress - Emitted periodically during scanning
*
* @example
* ```typescript
* const scanner = new ProjectScanner();
*
* scanner.on('project:scan_progress', ({ filesProcessed, totalFiles }) => {
* console.log(`Progress: ${filesProcessed}/${totalFiles}`);
* });
*
* const astForest = await scanner.scanProject('/path/to/godot/project', 'full');
* console.log(`Parsed ${astForest.length} files`);
* ```
*/
export class ProjectScanner extends EventEmitter {
private bridge: TreeSitterBridge;
private cacheManager: GraphCacheManager;
private stats: ScanStats;
<span class="fstat-no" title="function not covered" > constructor(b</span>ridge?: TreeSitterBridge, cacheManager?: GraphCacheManager) {
<span class="cstat-no" title="statement not covered" > super();</span>
<span class="cstat-no" title="statement not covered" > this.bridge = bridge ?? new TreeSitterBridge();</span>
<span class="cstat-no" title="statement not covered" > this.cacheManager = cacheManager ?? new GraphCacheManager();</span>
<span class="cstat-no" title="statement not covered" > this.stats = this.initializeStats();</span>
}
/**
* Scan Godot project for GDScript files and parse ASTs.
*
* @param {string} projectPath - Absolute path to Godot project root
* @param {ScanMode} mode - Scan mode ('full' or 'incremental')
* @returns {Promise<ASTForest>} Array of parsed AST trees with metadata
*
* @throws {Error} If projectPath doesn't exist or parsing fails critically
*
* @example
* ```typescript
* // Full scan (parse all files)
* const trees = await scanner.scanProject('/path/to/project', 'full');
*
* // Incremental scan (skip cached files)
* const trees = await scanner.scanProject('/path/to/project', 'incremental');
* ```
*/
<span class="fstat-no" title="function not covered" > async </span>scanProject(projectPath: string, mode: ScanMode = <span class="branch-0 cbranch-no" title="branch not covered" >'full')</span>: Promise<ASTForest> {
const startTime = <span class="cstat-no" title="statement not covered" >Date.now();</span>
<span class="cstat-no" title="statement not covered" > this.stats = this.initializeStats();</span>
// Resolve to absolute path
const absPath = <span class="cstat-no" title="statement not covered" >resolve(projectPath);</span>
<span class="cstat-no" title="statement not covered" > this.emit('project:scan_started', {</span>
projectPath: absPath,
mode,
timestamp: Date.now(),
});
<span class="cstat-no" title="statement not covered" > try {</span>
// Initialize tree-sitter if not already done
<span class="cstat-no" title="statement not covered" > await this.bridge.init();</span>
// Step 1: Discover all .gd files
const files = <span class="cstat-no" title="statement not covered" >await this.findGDScriptFiles(absPath);</span>
<span class="cstat-no" title="statement not covered" > this.stats.filesDiscovered = files.length;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (files.length === 0) {</span>
<span class="cstat-no" title="statement not covered" > this.emit('project:scan_completed', {</span>
...this.stats,
durationMs: Date.now() - startTime,
});
<span class="cstat-no" title="statement not covered" > return [];</span>
}
// Step 2: Filter files based on cache (incremental mode)
let filesToParse = <span class="cstat-no" title="statement not covered" >files;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (mode === 'incremental') {</span>
<span class="cstat-no" title="statement not covered" > filesToParse = await this.filterStaleFiles(files);</span>
<span class="cstat-no" title="statement not covered" > this.stats.filesSkipped = files.length - filesToParse.length;</span>
}
<span class="cstat-no" title="statement not covered" > this.stats.filesParsed = filesToParse.length;</span>
// Step 3: Parse files (parallel or serial)
const trees = <span class="cstat-no" title="statement not covered" >await this.parseFiles(filesToParse);</span>
// Step 4: Update cache
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (mode === 'incremental') {</span>
<span class="cstat-no" title="statement not covered" > for (const treeData of trees) {</span>
<span class="cstat-no" title="statement not covered" > this.cacheManager.updateCache(treeData.filePath, treeData.mtime);</span>
}
}
<span class="cstat-no" title="statement not covered" > this.stats.durationMs = Date.now() - startTime;</span>
<span class="cstat-no" title="statement not covered" > this.stats.peakMemoryBytes = process.memoryUsage().heapUsed;</span>
<span class="cstat-no" title="statement not covered" > this.emit('project:scan_completed', {</span>
...this.stats,
treeCount: trees.length,
timestamp: Date.now(),
});
<span class="cstat-no" title="statement not covered" > return trees;</span>
} catch (error) {
const errorMsg = <span class="cstat-no" title="statement not covered" >error instanceof Error ? error.message : String(error);</span>
<span class="cstat-no" title="statement not covered" > this.emit('project:scan_failed', {</span>
projectPath: absPath,
mode,
error: errorMsg,
timestamp: Date.now(),
});
<span class="cstat-no" title="statement not covered" > throw new Error(`Project scan failed: ${errorMsg}`);</span>
}
}
/**
* Recursively find all .gd files in project directory.
*
* Excludes:
* - .godot/ (Godot build cache)
* - node_modules/
* - .git/
* - Hidden directories (starting with .)
*
* @param {string} dir - Directory to search
* @returns {Promise<string[]>} Array of absolute file paths
*/
private <span class="fstat-no" title="function not covered" >async </span>findGDScriptFiles(dir: string): Promise<string[]> {
const files: string[] = <span class="cstat-no" title="statement not covered" >[];</span>
<span class="cstat-no" title="statement not covered" > try {</span>
const entries = <span class="cstat-no" title="statement not covered" >readdirSync(dir, { withFileTypes: true });</span>
<span class="cstat-no" title="statement not covered" > for (const entry of entries) {</span>
const fullPath = <span class="cstat-no" title="statement not covered" >join(dir, entry.name);</span>
// Skip excluded directories
<span class="cstat-no" title="statement not covered" > if (entry.isDirectory()) {</span>
const skipDirs = <span class="cstat-no" title="statement not covered" >['.godot', 'node_modules', '.git', 'build', 'dist'];</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (entry.name.startsWith('.') || skipDirs.includes(entry.name)) {</span>
<span class="cstat-no" title="statement not covered" > continue;</span>
}
// Recurse into subdirectory
const subFiles = <span class="cstat-no" title="statement not covered" >await this.findGDScriptFiles(fullPath);</span>
<span class="cstat-no" title="statement not covered" > files.push(...subFiles);</span>
} else <span class="cstat-no" title="statement not covered" ><span class="missing-if-branch" title="if path not taken" >I</span>if (entry.isFile() && extname(entry.name) === '.gd') {</span>
<span class="cstat-no" title="statement not covered" > files.push(fullPath);</span>
}
}
} catch (error) {
<span class="cstat-no" title="statement not covered" > console.warn(`Failed to read directory ${dir}: ${error}`);</span>
}
<span class="cstat-no" title="statement not covered" > return files;</span>
}
/**
* Filter files to only those requiring re-parsing (cache miss or stale).
*
* @param {string[]} files - All discovered files
* @returns {Promise<string[]>} Files requiring parsing
*/
private <span class="fstat-no" title="function not covered" >async </span>filterStaleFiles(files: string[]): Promise<string[]> {
const staleFiles: string[] = <span class="cstat-no" title="statement not covered" >[];</span>
<span class="cstat-no" title="statement not covered" > for (const file of files) {</span>
const isStale = <span class="cstat-no" title="statement not covered" >await this.cacheManager.isStale(file);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (isStale) {</span>
<span class="cstat-no" title="statement not covered" > staleFiles.push(file);</span>
}
}
<span class="cstat-no" title="statement not covered" > return staleFiles;</span>
}
/**
* Parse files using parallel workers or serial fallback.
*
* Worker count determination:
* - <8 files: Serial mode (overhead not worth it)
* - 8-64 files: min(4, cpuCount) workers
* - >64 files: min(8, cpuCount) workers
*
* @param {string[]} files - Files to parse
* @returns {Promise<ASTForest>} Parsed AST trees
*/
private <span class="fstat-no" title="function not covered" >async </span>parseFiles(files: string[]): Promise<ASTForest> {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (files.length === 0) {</span>
<span class="cstat-no" title="statement not covered" > return [];</span>
}
// TEMPORARILY: Force serial mode due to Worker thread ES module issues
// TODO: Fix Worker thread CommonJS/ES module compatibility
<span class="cstat-no" title="statement not covered" > this.stats.workerCount = 0;</span>
<span class="cstat-no" title="statement not covered" > return this.parseSerial(files);</span>
/* Parallel parsing disabled until Worker ES module issues are resolved
// Determine worker count
const cpuCount = cpus().length;
let workerCount = 0;
if (files.length < 8) {
workerCount = 0; // Serial mode
} else if (files.length < 64) {
workerCount = Math.min(4, cpuCount);
} else {
workerCount = Math.min(8, cpuCount);
}
this.stats.workerCount = workerCount;
if (workerCount === 0) {
return this.parseSerial(files);
} else {
return this.parseParallel(files, workerCount);
}
*/
}
/**
* Parse files serially (single-threaded).
*
* Used for small file counts where worker overhead > speedup benefit.
*
* @param {string[]} files - Files to parse
* @returns {Promise<ASTForest>} Parsed AST trees
*/
private <span class="fstat-no" title="function not covered" >async </span>parseSerial(files: string[]): Promise<ASTForest> {
const trees: ASTWithMetadata[] = <span class="cstat-no" title="statement not covered" >[];</span>
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < files.length; i++) {</span>
const filePath = <span class="cstat-no" title="statement not covered" >files[i];</span>
<span class="cstat-no" title="statement not covered" > try {</span>
const startTime = <span class="cstat-no" title="statement not covered" >Date.now();</span>
const tree = <span class="cstat-no" title="statement not covered" >await this.bridge.parseFile(filePath);</span>
const parseDuration = <span class="cstat-no" title="statement not covered" >Date.now() - startTime;</span>
const stats = <span class="cstat-no" title="statement not covered" >statSync(filePath);</span>
<span class="cstat-no" title="statement not covered" > trees.push({</span>
tree,
filePath,
sizeBytes: stats.size,
parseDurationMs: parseDuration,
mtime: Math.floor(stats.mtimeMs),
});
// Emit progress every 10 files
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if ((i + 1) % 10 === 0) {</span>
<span class="cstat-no" title="statement not covered" > this.emit('project:scan_progress', {</span>
filesProcessed: i + 1,
totalFiles: files.length,
});
}
} catch (error) {
<span class="cstat-no" title="statement not covered" > console.warn(`Failed to parse ${filePath}: ${error}`);</span>
}
}
<span class="cstat-no" title="statement not covered" > return trees;</span>
}
/**
* Parse files in parallel using worker threads.
*
* @param {string[]} files - Files to parse
* @param {number} workerCount - Number of workers to spawn
* @returns {Promise<ASTForest>} Parsed AST trees
*/
private <span class="fstat-no" title="function not covered" >async </span>parseParallel(files: string[], workerCount: number): Promise<ASTForest> {
// Split files into chunks
const chunks = <span class="cstat-no" title="statement not covered" >this.chunkArray(files, workerCount);</span>
// Spawn workers
const workerPromises = <span class="cstat-no" title="statement not covered" >chunks.map(<span class="fstat-no" title="function not covered" >(c</span>hunk, workerId) => {</span>
<span class="cstat-no" title="statement not covered" > return this.spawnWorker(chunk, workerId);</span>
});
// Wait for all workers to complete
const results = <span class="cstat-no" title="statement not covered" >await Promise.all(workerPromises);</span>
// Flatten results
const trees: ASTWithMetadata[] = <span class="cstat-no" title="statement not covered" >[];</span>
const errors: Array<{ filePath: string; error: string }> = <span class="cstat-no" title="statement not covered" >[];</span>
<span class="cstat-no" title="statement not covered" > for (const result of results) {</span>
<span class="cstat-no" title="statement not covered" > trees.push(...result.trees);</span>
<span class="cstat-no" title="statement not covered" > errors.push(...result.errors);</span>
}
// Log errors (non-fatal)
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (errors.length > 0) {</span>
<span class="cstat-no" title="statement not covered" > console.warn(`Encountered ${errors.length} parse errors:`);</span>
<span class="cstat-no" title="statement not covered" > for (const { filePath, error } of errors.slice(0, 10)) {</span>
<span class="cstat-no" title="statement not covered" > console.warn(` ${filePath}: ${error}`);</span>
}
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (errors.length > 10) {</span>
<span class="cstat-no" title="statement not covered" > console.warn(` ... and ${errors.length - 10} more errors`);</span>
}
}
<span class="cstat-no" title="statement not covered" > return trees;</span>
}
/**
* Spawn a worker thread to parse a chunk of files.
*
* @param {string[]} files - Files for this worker to parse
* @param {number} workerId - Worker identifier
* @returns {Promise<WorkerResult>} Worker parse results
*/
private <span class="fstat-no" title="function not covered" >async </span>spawnWorker(files: string[], workerId: number): Promise<WorkerResult> {
<span class="cstat-no" title="statement not covered" > return new Promise(<span class="fstat-no" title="function not covered" >(r</span>esolve, reject) => {</span>
// Use dynamic path resolution for worker script
// In production (build/), use .js; in tests, use .ts
const workerPath = <span class="cstat-no" title="statement not covered" >process.env.NODE_ENV === 'test'</span>
? join(process.cwd(), 'src/artifacts/scanner/parse_worker.ts')
: join(dirname(require.resolve('./cache_manager.js')), 'parse_worker.js');
const payload: WorkerPayload = <span class="cstat-no" title="statement not covered" >{</span>
files,
workerId,
};
const worker = <span class="cstat-no" title="statement not covered" >new Worker(workerPath, {</span>
workerData: payload,
});
<span class="cstat-no" title="statement not covered" > worker.on('message', <span class="fstat-no" title="function not covered" >(r</span>esult: WorkerResult) => {</span>
<span class="cstat-no" title="statement not covered" > resolve(result);</span>
});
<span class="cstat-no" title="statement not covered" > worker.on('error', <span class="fstat-no" title="function not covered" >(e</span>rror) => {</span>
<span class="cstat-no" title="statement not covered" > reject(new Error(`Worker ${workerId} error: ${error.message}`));</span>
});
<span class="cstat-no" title="statement not covered" > worker.on('exit', <span class="fstat-no" title="function not covered" >(c</span>ode) => {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (code !== 0) {</span>
<span class="cstat-no" title="statement not covered" > reject(new Error(`Worker ${workerId} exited with code ${code}`));</span>
}
});
});
}
/**
* Chunk array into N roughly equal-sized chunks.
*
* @param {T[]} array - Array to chunk
* @param {number} chunkCount - Number of chunks
* @returns {T[][]} Array of chunks
*/
private <span class="fstat-no" title="function not covered" >chunkArray<</span>T>(array: T[], chunkCount: number): T[][] {
const chunks: T[][] = <span class="cstat-no" title="statement not covered" >[];</span>
const chunkSize = <span class="cstat-no" title="statement not covered" >Math.ceil(array.length / chunkCount);</span>
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < chunkCount; i++) {</span>
const start = <span class="cstat-no" title="statement not covered" >i * chunkSize;</span>
const end = <span class="cstat-no" title="statement not covered" >Math.min(start + chunkSize, array.length);</span>
const chunk = <span class="cstat-no" title="statement not covered" >array.slice(start, end);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (chunk.length > 0) {</span>
<span class="cstat-no" title="statement not covered" > chunks.push(chunk);</span>
}
}
<span class="cstat-no" title="statement not covered" > return chunks;</span>
}
/**
* Initialize scan statistics.
*/
private <span class="fstat-no" title="function not covered" >initializeStats(</span>): ScanStats {
<span class="cstat-no" title="statement not covered" > return {</span>
filesDiscovered: 0,
filesParsed: 0,
filesSkipped: 0,
durationMs: 0,
peakMemoryBytes: 0,
workerCount: 0,
};
}
/**
* Get last scan statistics.
*
* @returns {ScanStats} Statistics from most recent scan
*/
<span class="fstat-no" title="function not covered" > getStats(</span>): ScanStats {
<span class="cstat-no" title="statement not covered" > return { ...this.stats };</span>
}
/**
* Get cache manager instance (for testing/debugging).
*/
<span class="fstat-no" title="function not covered" > getCacheManager(</span>): GraphCacheManager {
<span class="cstat-no" title="statement not covered" > return this.cacheManager;</span>
}
}
</pre></td></tr></table></pre>
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