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* TreeSitterManager - Loads and manages tree-sitter language grammars
*
* This module is responsible for loading the specified tree-sitter language
* grammars (JavaScript, Python, TypeScript) from their NPM package locations
* and providing access to initialized parsers for these languages.
*/
import pkg from "tree-sitter";
const { Parser } = pkg;
import path from "path";
import fs from "fs";
import logger from "../../utils/logger.js";
/**
* TreeSitterManager class
* Responsible for loading and managing tree-sitter language grammars
*/
export class TreeSitterManager {
/**
* Creates a new TreeSitterManager instance
*/
constructor() {
this.loadedGrammars = new Map();
this.initialized = false;
}
/**
* Initialize tree-sitter language grammars
* @param {string[]} configuredLanguages - Array of language names to load (e.g., ['javascript', 'python', 'typescript'])
* @returns {Promise<boolean>} - True if all configured languages were loaded successfully
*/
async initializeGrammars(configuredLanguages) {
if (this.initialized) {
logger.warn(
"TreeSitterManager.initializeGrammars called, but grammars are already initialized"
);
return true;
}
logger.info(
`Initializing Tree-sitter grammars for: ${configuredLanguages.join(", ")}`
);
let allSuccessful = true;
// Process each configured language
for (const language of configuredLanguages) {
try {
// Handle special cases for languages with native bindings
if (language === "typescript") {
await this.loadTypescriptGrammar();
continue;
} else if (language === "python") {
await this.loadPythonGrammar();
continue;
} else if (language === "javascript") {
await this.loadJavaScriptGrammar();
continue;
}
// If we get here, we don't have a specific loader for this language
logger.warn(`No specific loader available for language: ${language}`);
allSuccessful = false;
} catch (error) {
logger.error(
`Failed to load grammar for ${language}: ${error.message}`,
{
error: error.stack,
}
);
allSuccessful = false;
}
}
// Set initialized flag
this.initialized = this.loadedGrammars.size > 0;
if (!this.initialized) {
logger.error("Failed to initialize any Tree-sitter grammars");
return false;
}
logger.info(
`Successfully initialized ${this.loadedGrammars.size} Tree-sitter grammars`
);
return allSuccessful;
}
/**
* Load the JavaScript grammar using WASM
* @private
*/
async loadJavaScriptGrammar() {
try {
logger.info("Loading JavaScript grammar using require");
// Use CommonJS require for loading the JavaScript grammar
const { createRequire } = await import("module");
const require = createRequire(import.meta.url);
// Load the JavaScript grammar
const jsLanguage = require("tree-sitter-javascript");
if (!jsLanguage) {
throw new Error("Failed to load JavaScript grammar module");
}
this.loadedGrammars.set("javascript", jsLanguage);
logger.info("Successfully loaded grammar for javascript");
} catch (error) {
logger.error(`Failed to load JavaScript grammar: ${error.message}`, {
error: error.stack,
});
throw error;
}
}
/**
* Load the TypeScript grammar using Node.js bindings
* @private
*/
async loadTypescriptGrammar() {
try {
logger.info("Loading TypeScript grammars using Node.js bindings");
// Use Node.js require for native modules
// Since we're in ESM context, we need to use createRequire
const { createRequire } = await import("module");
const require = createRequire(import.meta.url);
// Load TypeScript module
const tsModule = require("tree-sitter-typescript");
if (!tsModule) {
throw new Error("Failed to load TypeScript grammar module");
}
// TypeScript grammar
if (tsModule.typescript) {
this.loadedGrammars.set("typescript", tsModule.typescript);
logger.info("Successfully loaded grammar for typescript");
} else {
logger.error("TypeScript grammar not found in the module");
}
// TSX grammar
if (tsModule.tsx) {
this.loadedGrammars.set("tsx", tsModule.tsx);
logger.info("Successfully loaded grammar for tsx");
} else {
logger.error("TSX grammar not found in the module");
}
} catch (error) {
logger.error(`Failed to load TypeScript grammars: ${error.message}`, {
error: error.stack,
});
throw error;
}
}
/**
* Load the Python grammar using Node.js bindings
* @private
*/
async loadPythonGrammar() {
try {
logger.info("Loading Python grammar using Node.js bindings");
// Use Node.js require for native modules
// Since we're in ESM context, we need to use createRequire
const { createRequire } = await import("module");
const require = createRequire(import.meta.url);
// Load Python module
const pythonModule = require("tree-sitter-python");
if (!pythonModule) {
throw new Error("Failed to load Python grammar module");
}
this.loadedGrammars.set("python", pythonModule);
logger.info("Successfully loaded grammar for python");
} catch (error) {
logger.error(`Failed to load Python grammar: ${error.message}`, {
error: error.stack,
});
throw error;
}
}
/**
* Get a parser for the specified language
* @param {string} languageName - Name of the language (e.g., 'javascript', 'python', 'typescript', 'tsx')
* @returns {Parser|null} - Initialized parser for the language or null if not available
*/
getParserForLanguage(languageName) {
if (!this.initialized) {
logger.warn(
"TreeSitterManager.getParserForLanguage called before initialization"
);
return null;
}
const grammar = this.loadedGrammars.get(languageName);
if (!grammar) {
logger.warn(`No grammar loaded for language: ${languageName}`);
return null;
}
try {
// Create a new parser instance
const parser = new pkg();
// Set the language for the parser
parser.setLanguage(grammar);
return parser;
} catch (error) {
logger.error(
`Failed to create parser for ${languageName}: ${error.message}`,
{
error: error.stack,
}
);
return null;
}
}
/**
* Check if a language grammar is loaded
* @param {string} languageName - Name of the language
* @returns {boolean} - True if the language grammar is loaded
*/
hasLanguage(languageName) {
return this.loadedGrammars.has(languageName);
}
/**
* Get list of loaded language grammars
* @returns {string[]} - Array of language names that are loaded
*/
getLoadedLanguages() {
return Array.from(this.loadedGrammars.keys());
}
}
export default TreeSitterManager;
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