What is an ANTLR grammar?

ANTLR (ANother Tool for Language Recognition) is a tool for processing structured text. It does this by giving us access to language processing primitives like lexers, grammars, and parsers as well as the runtime to process text against them. It’s often used to build tools and frameworks.

How do you write an ANTLR in grammar?

Steps for configuring your Antlr plugin:

1. Navigate to Tools and then to Configure ANTLR.
2. A box would appear like this:
3. Add the details like where you want the output like the files for Lexer and Parser, the location of the grammar file (.g4 file) .
4. Leave the Grammar file encoding, if you have not used any encoding.

How does an ANTLR work?

ANTLR is code generator. It takes so called grammar file as input and generates two classes: lexer and parser. The stream of tokes is passed to parser which do all necessary work. It is the parser who builds abstract syntax tree, interprets the code or translate it into some other form.

What are Lexer rules?

Lexer rules allow your parser to match context-free structures on the input character stream as opposed to the much weaker regular structures (using a DFA–deterministic finite automaton).

What does ANTLR generate?

ANTLR can generate lexers, parsers, tree parsers, and combined lexer-parsers. Other than lexers and parsers, ANTLR can be used to generate tree parsers. These are recognizers that process abstract syntax trees, which can be automatically generated by parsers.

Is Antlr LL or LR?

In computer-based language recognition, ANTLR (pronounced antler), or ANother Tool for Language Recognition, is a parser generator that uses LL(*) for parsing.

How do I run ANTLR in Intellij?

right click on the ANTLR grammar file and select Generate ANTLR Recognizer from the context menu. The Compile ‘file. g4’ option under the main Build menu does nothing for me. next mark the output directory (by default, the gen directory in the project root) as generated source.