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<h1><a href="../../../index.html">All files</a> / <a href="index.html">src/artifacts/parsers</a> tree_sitter_bridge.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Tree-sitter WASM Bridge for GDScript AST Parsing
*
* Provides production-grade AST parsing via tree-sitter-gdscript WASM runtime.
* Replaces regex-based parser with accurate, fault-tolerant AST extraction.
*
* Performance targets:
* - WASM initialization: <500ms
* - Parsing throughput: >4000 LOC/second (250ms for 1000 LOC)
*
* @module tree_sitter_bridge
*/
import Parser from 'tree-sitter';
import { readFileSync } from 'fs';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';
// Tree-sitter language grammars are typically loaded dynamically
let GDScript: any;
/**
* WASM-backed GDScript parser using tree-sitter runtime.
*
* Initialization is async due to WASM loading. Call init() before parseFile().
*
* @example
* ```typescript
* const bridge = new TreeSitterBridge();
* await bridge.init();
* const tree = await bridge.parseFile('path/to/script.gd');
* ```
*/
export class TreeSitterBridge {
private parser: Parser | null = <span class="cstat-no" title="statement not covered" >null;</span>
private initialized: boolean = <span class="cstat-no" title="statement not covered" >false;</span>
private initStartTime: number = <span class="cstat-no" title="statement not covered" >0;</span>
/**
* Initialize tree-sitter WASM runtime and load GDScript grammar.
*
* @throws {Error} If WASM fails to load or grammar is unavailable
* @returns {Promise<void>}
*/
<span class="fstat-no" title="function not covered" > async </span>init(): Promise<void> {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (this.initialized) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
<span class="cstat-no" title="statement not covered" > this.initStartTime = Date.now();</span>
<span class="cstat-no" title="statement not covered" > try {</span>
// Import tree-sitter-gdscript native bindings
// For Node.js environments, we need to use dynamic require for native modules
// We'll use a helper function to load the module
<span class="cstat-no" title="statement not covered" > GDScript = await this.loadGDScriptLanguage();</span>
<span class="cstat-no" title="statement not covered" > this.parser = new Parser();</span>
<span class="cstat-no" title="statement not covered" > this.parser.setLanguage(GDScript);</span>
<span class="cstat-no" title="statement not covered" > this.initialized = true;</span>
const initDuration = <span class="cstat-no" title="statement not covered" >Date.now() - this.initStartTime;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (initDuration > 500) {</span>
<span class="cstat-no" title="statement not covered" > console.warn(`Tree-sitter WASM initialization took ${initDuration}ms (target: <500ms)`);</span>
}
} catch (error) {
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
`Failed to initialize tree-sitter WASM: ${error instanceof Error ? error.message : String(error)}. ` +
`Ensure tree-sitter-gdscript is installed and compiled via: cd node_modules/tree-sitter-gdscript && node-gyp rebuild`
);
}
}
/**
* Load GDScript language grammar using dynamic import or require.
* This helper handles the complexity of loading native modules in ESM context.
*/
private <span class="fstat-no" title="function not covered" >async </span>loadGDScriptLanguage(): Promise<any> {
<span class="cstat-no" title="statement not covered" > try {</span>
// Try using Node's native require for CommonJS native modules
// Using eval to avoid static analysis issues
const req = <span class="cstat-no" title="statement not covered" >(typeof require !== 'undefined')</span>
? require
: eval('require'); // Fallback for environments without global require
// First try direct path to compiled binding (for newly compiled versions)
<span class="cstat-no" title="statement not covered" > try {</span>
const { resolve: resolvePath } = <span class="cstat-no" title="statement not covered" >await import('path');</span>
const bindingPath = <span class="cstat-no" title="statement not covered" >resolvePath(</span>
process.cwd(),
'node_modules/tree-sitter-gdscript/build/Release/tree_sitter_gdscript_binding.node'
);
<span class="cstat-no" title="statement not covered" > return req(bindingPath);</span>
} catch (directError) {
// Fall back to package name (will use prebuilt bindings if available)
<span class="cstat-no" title="statement not covered" > return req('tree-sitter-gdscript');</span>
}
} catch (error) {
// If require doesn't work, try dynamic import as fallback
const module = <span class="cstat-no" title="statement not covered" >await import('tree-sitter-gdscript');</span>
<span class="cstat-no" title="statement not covered" > return module.default || module;</span>
}
}
/**
* Parse GDScript file into AST tree structure.
*
* @param {string} filePath - Absolute or relative path to .gd file
* @returns {Promise<Parser.Tree>} AST tree for traversal
* @throws {Error} If parser not initialized or file read fails
*
* @example
* ```typescript
* const tree = await bridge.parseFile('EventBus.gd');
* const rootNode = tree.rootNode;
* console.log(rootNode.type); // 'source_file'
* ```
*/
<span class="fstat-no" title="function not covered" > async </span>parseFile(filePath: string): Promise<Parser.Tree> {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!this.initialized || !this.parser) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
'TreeSitterBridge not initialized. Call init() before parseFile().'
);
}
const parseStartTime = <span class="cstat-no" title="statement not covered" >Date.now();</span>
<span class="cstat-no" title="statement not covered" > try {</span>
const sourceCode = <span class="cstat-no" title="statement not covered" >readFileSync(filePath, 'utf-8');</span>
const tree = <span class="cstat-no" title="statement not covered" >this.parser.parse(sourceCode);</span>
const parseDuration = <span class="cstat-no" title="statement not covered" >Date.now() - parseStartTime;</span>
const lineCount = <span class="cstat-no" title="statement not covered" >sourceCode.split('\n').length;</span>
// Performance validation: 1000 LOC should parse in <250ms
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (lineCount >= 1000 && parseDuration > 250) {</span>
<span class="cstat-no" title="statement not covered" > console.warn(</span>
`Performance target missed: ${lineCount} LOC parsed in ${parseDuration}ms (target: <250ms for 1000 LOC)`
);
}
<span class="cstat-no" title="statement not covered" > return tree;</span>
} catch (error) {
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
`Failed to parse file ${filePath}: ${error instanceof Error ? error.message : String(error)}`
);
}
}
/**
* Parse GDScript source code string into AST tree.
*
* @param {string} sourceCode - GDScript source code
* @returns {Parser.Tree} AST tree for traversal
* @throws {Error} If parser not initialized
*/
<span class="fstat-no" title="function not covered" > parseString(</span>sourceCode: string): Parser.Tree {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!this.initialized || !this.parser) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error(</span>
'TreeSitterBridge not initialized. Call init() before parseString().'
);
}
<span class="cstat-no" title="statement not covered" > return this.parser.parse(sourceCode);</span>
}
/**
* Check if bridge is initialized and ready for parsing.
*
* @returns {boolean} True if init() completed successfully
*/
<span class="fstat-no" title="function not covered" > isInitialized(</span>): boolean {
<span class="cstat-no" title="statement not covered" > return this.initialized;</span>
}
}
</pre></td></tr></table></pre>
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