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<h1><a href="../../index.html">All files</a> / <a href="index.html">src/utils</a> tree_sitter.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Tree-Sitter Utilities
*
* Shared AST parsing utilities using tree-sitter native bindings.
* Uses tree-sitter (native) for better performance than WASM.
*
* Performance Budget:
* - Initialization: <50ms (one-time cost, native binding load)
* - Parse time: <10ms per 500-line file
* - Cached parse: <1ms
* - Memory: <30MB for 100 files
*
* @module utils/tree_sitter
*/
import Parser from 'tree-sitter';
import GDScript from 'tree-sitter-gdscript';
import { readFileSync } from 'fs';
import { existsSync } from 'fs';
/**
* Singleton parser instance (lazy-initialized)
*/
let parser: Parser | null = <span class="cstat-no" title="statement not covered" >null;</span>
let initPromise: Promise<void> | null = <span class="cstat-no" title="statement not covered" >null;</span>
/**
* AST cache for performance optimization
* Key: file path or cache key
* Value: parsed tree
*/
const astCache = <span class="cstat-no" title="statement not covered" >new Map<string, Parser.Tree>();</span>
/**
* Performance metrics
*/
interface ParserMetrics {
initTime: number;
parseTime: number;
cacheHits: number;
cacheMisses: number;
filesProcessed: number;
}
const metrics: ParserMetrics = <span class="cstat-no" title="statement not covered" >{</span>
initTime: 0,
parseTime: 0,
cacheHits: 0,
cacheMisses: 0,
filesProcessed: 0,
};
/**
* Initialize tree-sitter runtime with GDScript grammar.
*
* This is a lazy initialization function - it will only initialize once
* and subsequent calls will return immediately.
*
* @throws {Error} If native binding fails to load
* @returns {Promise<void>}
*
* @example
* ```typescript
* await initTreeSitter();
* const tree = await parseGDScript(code);
* ```
*/
export async function <span class="fstat-no" title="function not covered" >initTreeSitter(</span>): Promise<void> {
// Return immediately if already initialized
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (parser) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
// Wait for ongoing initialization if one exists
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (initPromise) {</span>
<span class="cstat-no" title="statement not covered" > return initPromise;</span>
}
// Start new initialization
<span class="cstat-no" title="statement not covered" > initPromise = (<span class="fstat-no" title="function not covered" >async </span>() => {</span>
const startTime = <span class="cstat-no" title="statement not covered" >Date.now();</span>
<span class="cstat-no" title="statement not covered" > try {</span>
// Create parser instance
<span class="cstat-no" title="statement not covered" > parser = new Parser();</span>
// Load GDScript language grammar (native binding)
<span class="cstat-no" title="statement not covered" > parser.setLanguage(GDScript);</span>
<span class="cstat-no" title="statement not covered" > metrics.initTime = Date.now() - startTime;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (metrics.initTime > 50) {</span>
<span class="cstat-no" title="statement not covered" > console.warn(`⚠️ Tree-sitter init took ${metrics.initTime}ms (target: <50ms)`);</span>
}
} catch (error) {
// Reset state on error
<span class="cstat-no" title="statement not covered" > parser = null;</span>
<span class="cstat-no" title="statement not covered" > initPromise = null;</span>
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
`Failed to initialize tree-sitter: ${error instanceof Error ? error.message : String(error)}`
);
}
})();
<span class="cstat-no" title="statement not covered" > return initPromise;</span>
}
/**
* Parse GDScript code and return AST tree.
*
* @param code - GDScript source code to parse
* @param cacheKey - Optional cache key (e.g., file path) for performance
* @returns Parsed AST tree
*
* @example
* ```typescript
* const tree = await parseGDScript(code, 'path/to/file.gd');
* const signals = findSignalDefinitions(tree);
* ```
*/
export async function <span class="fstat-no" title="function not covered" >parseGDScript(</span>
code: string,
cacheKey?: string
): Promise<Parser.Tree> {
<span class="cstat-no" title="statement not covered" > await initTreeSitter();</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!parser) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error('Parser not initialized');</span>
}
// Check cache
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (cacheKey && astCache.has(cacheKey)) {</span>
<span class="cstat-no" title="statement not covered" > metrics.cacheHits++;</span>
<span class="cstat-no" title="statement not covered" > return astCache.get(cacheKey)!;</span>
}
<span class="cstat-no" title="statement not covered" > metrics.cacheMisses++;</span>
// Parse code
const parseStart = <span class="cstat-no" title="statement not covered" >Date.now();</span>
const tree = <span class="cstat-no" title="statement not covered" >parser.parse(code);</span>
<span class="cstat-no" title="statement not covered" > metrics.parseTime += Date.now() - parseStart;</span>
<span class="cstat-no" title="statement not covered" > metrics.filesProcessed++;</span>
// Store in cache if key provided
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (cacheKey) {</span>
<span class="cstat-no" title="statement not covered" > astCache.set(cacheKey, tree);</span>
}
<span class="cstat-no" title="statement not covered" > return tree;</span>
}
/**
* Parse GDScript file and return AST tree.
*
* @param filePath - Absolute path to GDScript file
* @param useCache - Whether to use cache (default: true)
* @returns Parsed AST tree
*
* @example
* ```typescript
* const tree = await parseGDScriptFile('autoload/EventBus.gd');
* ```
*/
export async function <span class="fstat-no" title="function not covered" >parseGDScriptFile(</span>
filePath: string,
useCache: boolean = <span class="branch-0 cbranch-no" title="branch not covered" >true</span>
): Promise<Parser.Tree> {
const code = <span class="cstat-no" title="statement not covered" >readFileSync(filePath, 'utf-8');</span>
const cacheKey = <span class="cstat-no" title="statement not covered" >useCache ? filePath : undefined;</span>
<span class="cstat-no" title="statement not covered" > return parseGDScript(code, cacheKey);</span>
}
/**
* Signal definition extracted from AST
*/
export interface SignalDefinition {
name: string;
line: number;
params: string[];
paramTypes: Record<string, string>;
}
/**
* Find signal definitions in parsed AST tree.
*
* Uses tree-sitter query syntax for accurate extraction:
* - (signal_statement name: (identifier) @signal.name)
* - (parameter_list (parameter name: (identifier) type: (type) @param.type) @param)
*
* @param tree - Parsed AST tree
* @returns Array of signal definitions with parameters
*
* @example
* ```typescript
* const tree = await parseGDScript(code);
* const signals = findSignalDefinitions(tree);
* // [{ name: "player_died", line: 5, params: ["reason"], paramTypes: { "reason": "String" } }]
* ```
*/
export function <span class="fstat-no" title="function not covered" >findSignalDefinitions(</span>tree: Parser.Tree): SignalDefinition[] {
const signals: SignalDefinition[] = <span class="cstat-no" title="statement not covered" >[];</span>
// Use tree traversal instead of queries (native tree-sitter doesn't have query API)
function <span class="fstat-no" title="function not covered" >visitNode(</span>node: Parser.SyntaxNode) {
// Look for signal_statement nodes
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'signal_statement') {</span>
// Extract signal name from first identifier child
const nameNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('name');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (nameNode) {</span>
const signalName = <span class="cstat-no" title="statement not covered" >nameNode.text;</span>
const line = <span class="cstat-no" title="statement not covered" >nameNode.startPosition.row + 1;</span>
// Extract parameters if present
const paramsNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('parameters');</span>
const params: string[] = <span class="cstat-no" title="statement not covered" >[];</span>
const paramTypes: Record<string, string> = <span class="cstat-no" title="statement not covered" >{};</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramsNode) {</span>
// Traverse parameter nodes
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < paramsNode.namedChildCount; i++) {</span>
const paramNode = <span class="cstat-no" title="statement not covered" >paramsNode.namedChild(i);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramNode && paramNode.type === 'parameter') {</span>
const paramName = <span class="cstat-no" title="statement not covered" >paramNode.childForFieldName('name')?.text;</span>
const paramType = <span class="cstat-no" title="statement not covered" >paramNode.childForFieldName('type')?.text;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramName) {</span>
<span class="cstat-no" title="statement not covered" > params.push(paramName);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramType) {</span>
<span class="cstat-no" title="statement not covered" > paramTypes[paramName] = paramType;</span>
}
}
}
}
}
<span class="cstat-no" title="statement not covered" > signals.push({ name: signalName, line, params, paramTypes });</span>
}
}
// Recursively visit children
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < node.namedChildCount; i++) {</span>
const child = <span class="cstat-no" title="statement not covered" >node.namedChild(i);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (child) <span class="cstat-no" title="statement not covered" >visitNode(child);</span></span>
}
}
<span class="cstat-no" title="statement not covered" > visitNode(tree.rootNode);</span>
<span class="cstat-no" title="statement not covered" > return signals;</span>
}
/**
* Find class definitions in parsed AST tree.
*
* @param tree - Parsed AST tree
* @returns Array of class names
*/
export function <span class="fstat-no" title="function not covered" >findClassDefinitions(</span>tree: Parser.Tree): string[] {
const classes: string[] = <span class="cstat-no" title="statement not covered" >[];</span>
function <span class="fstat-no" title="function not covered" >visitNode(</span>node: Parser.SyntaxNode): void {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'class_definition') {</span>
const nameNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('name');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (nameNode) {</span>
<span class="cstat-no" title="statement not covered" > classes.push(nameNode.text);</span>
}
}
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < node.namedChildCount; i++) {</span>
const child = <span class="cstat-no" title="statement not covered" >node.namedChild(i);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (child) <span class="cstat-no" title="statement not covered" >visitNode(child);</span></span>
}
}
<span class="cstat-no" title="statement not covered" > visitNode(tree.rootNode);</span>
<span class="cstat-no" title="statement not covered" > return classes;</span>
}
/**
* Find function definitions in parsed AST tree.
*
* @param tree - Parsed AST tree
* @returns Array of function signatures
*/
export interface FunctionSignature {
name: string;
line: number;
params: string[];
returnType?: string;
}
export function <span class="fstat-no" title="function not covered" >findFunctionDefinitions(</span>tree: Parser.Tree): FunctionSignature[] {
const functions: FunctionSignature[] = <span class="cstat-no" title="statement not covered" >[];</span>
const cursor = <span class="cstat-no" title="statement not covered" >tree.walk();</span>
function <span class="fstat-no" title="function not covered" >visitNode(</span>node: Parser.SyntaxNode): void {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (node.type === 'function_definition') {</span>
const nameNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('name');</span>
const paramsNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('parameters');</span>
const returnTypeNode = <span class="cstat-no" title="statement not covered" >node.childForFieldName('return_type');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (nameNode) {</span>
const params: string[] = <span class="cstat-no" title="statement not covered" >[];</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramsNode) {</span>
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < paramsNode.namedChildCount; i++) {</span>
const paramNode = <span class="cstat-no" title="statement not covered" >paramsNode.namedChild(i);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramNode && paramNode.type === 'parameter') {</span>
const paramName = <span class="cstat-no" title="statement not covered" >paramNode.childForFieldName('name');</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (paramName) {</span>
<span class="cstat-no" title="statement not covered" > params.push(paramName.text);</span>
}
}
}
}
<span class="cstat-no" title="statement not covered" > functions.push({</span>
name: nameNode.text,
line: nameNode.startPosition.row + 1,
params,
returnType: returnTypeNode ? returnTypeNode.text : undefined,
});
}
}
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < node.namedChildCount; i++) {</span>
const child = <span class="cstat-no" title="statement not covered" >node.namedChild(i);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (child) <span class="cstat-no" title="statement not covered" >visitNode(child);</span></span>
}
}
<span class="cstat-no" title="statement not covered" > visitNode(tree.rootNode);</span>
<span class="cstat-no" title="statement not covered" > return functions;</span>
}
/**
* Clear AST cache to free memory.
*
* Call this periodically when processing large projects.
*/
export function <span class="fstat-no" title="function not covered" >clearCache(</span>): void {
<span class="cstat-no" title="statement not covered" > astCache.clear();</span>
<span class="cstat-no" title="statement not covered" > metrics.cacheHits = 0;</span>
<span class="cstat-no" title="statement not covered" > metrics.cacheMisses = 0;</span>
}
/**
* Get parser performance metrics.
*
* @returns Performance metrics object
*/
export function <span class="fstat-no" title="function not covered" >getMetrics(</span>): Readonly<ParserMetrics> {
<span class="cstat-no" title="statement not covered" > return { ...metrics };</span>
}
/**
* Reset performance metrics.
*/
export function <span class="fstat-no" title="function not covered" >resetMetrics(</span>): void {
<span class="cstat-no" title="statement not covered" > metrics.initTime = 0;</span>
<span class="cstat-no" title="statement not covered" > metrics.parseTime = 0;</span>
<span class="cstat-no" title="statement not covered" > metrics.cacheHits = 0;</span>
<span class="cstat-no" title="statement not covered" > metrics.cacheMisses = 0;</span>
<span class="cstat-no" title="statement not covered" > metrics.filesProcessed = 0;</span>
}
</pre></td></tr></table></pre>
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