antlr4ts

import { ANTLRInputStream, CommonTokenStream } from 'antlr4ts'; import { MyGrammarLexer } from './MyGrammarLexer'; // Assuming generated lexer import { MyGrammarParser, FunctionDeclarationContext } from './MyGrammarParser'; // Assuming generated parser and context import { MyGrammarParserListener } from './MyGrammarParserListener'; // Assuming generated listener interface import { ParseTreeWalker } from 'antlr4ts/tree/ParseTreeWalker'; // Step 1: Define your input text const inputText = "function myFunction() { return 42; }"; // Step 2: Create an ANTLRInputStream from the input let inputStream = new ANTLRInputStream(inputText); // Step 3: Create a lexer (generated from your grammar) and tokenize the input let lexer = new MyGrammarLexer(inputStream); let tokenStream = new CommonTokenStream(lexer); // Step 4: Create a parser (generated from your grammar) and parse the token stream let parser = new MyGrammarParser(tokenStream); // Step 5: Specify the entry point rule for parsing let tree = parser.compilationUnit(); // Assuming 'compilationUnit' is your grammar's starting rule // Step 6: (Optional) Implement a listener to traverse the parse tree class MyFunctionListener implements MyGrammarParserListener { enterFunctionDeclaration(context: FunctionDeclarationContext) { console.log(`Found function: ${context.text} on line ${context._start.line}`); // Additional logic to extract details from the function declaration } // Implement other enter/exit methods as needed for your grammar rules } // Step 7: Walk the parse tree with your listener const listener = new MyFunctionListener(); ParseTreeWalker.DEFAULT.walk(listener, tree); console.log("Parsing complete. Check console for listener output.");