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antlr4

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antlr4

JavaScript runtime for ANTLR4

  • 4.13.2
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What is antlr4?

The antlr4 npm package is a powerful tool for building language parsers. It allows developers to define grammars for programming languages, data formats, and more, and then generate parsers that can process text according to those grammars.

What are antlr4's main functionalities?

Grammar Definition

This code demonstrates how to define a grammar and use it to parse an input string. The grammar is defined in separate files (MyGrammarLexer and MyGrammarParser), and the input string is processed according to the rules defined in the grammar.

const antlr4 = require('antlr4');
const { ANTLRInputStream, CommonTokenStream } = antlr4;
const MyGrammarLexer = require('./MyGrammarLexer');
const MyGrammarParser = require('./MyGrammarParser');

const input = 'your input string';
const inputStream = new ANTLRInputStream(input);
const lexer = new MyGrammarLexer(inputStream);
const tokenStream = new CommonTokenStream(lexer);
const parser = new MyGrammarParser(tokenStream);
const tree = parser.startRule();

Tree Walking

This code demonstrates how to walk through the parse tree generated by the parser. A listener (MyGrammarListener) is used to respond to events as the tree is walked, allowing for custom processing of the parsed input.

const antlr4 = require('antlr4');
const { ParseTreeWalker } = antlr4.tree;
const MyGrammarListener = require('./MyGrammarListener');

const input = 'your input string';
const inputStream = new ANTLRInputStream(input);
const lexer = new MyGrammarLexer(inputStream);
const tokenStream = new CommonTokenStream(lexer);
const parser = new MyGrammarParser(tokenStream);
const tree = parser.startRule();

const listener = new MyGrammarListener();
ParseTreeWalker.DEFAULT.walk(listener, tree);

Custom Visitor

This code demonstrates how to use a custom visitor (MyGrammarVisitor) to traverse the parse tree. The visitor pattern allows for more flexible and reusable tree processing compared to listeners.

const antlr4 = require('antlr4');
const MyGrammarVisitor = require('./MyGrammarVisitor');

const input = 'your input string';
const inputStream = new ANTLRInputStream(input);
const lexer = new MyGrammarLexer(inputStream);
const tokenStream = new CommonTokenStream(lexer);
const parser = new MyGrammarParser(tokenStream);
const tree = parser.startRule();

const visitor = new MyGrammarVisitor();
const result = visitor.visit(tree);

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Package last updated on 03 Aug 2024

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