Antlr图形规则表示

Question

Is there a tool to create a graphical representation of one's antlr4 grammar that means the parser/lexer rules eg as a graphical representation of a finite state machine?

It should be the case that it can be represented since it has backus naur form.

Example:

plus: INT '+' INT | plus '+' INT
INT: [0-9]+

A corresponding finite-state machine would be

start -> INT <-> plus
          |
          v
        exit

There may also be other graphical representations but a finite-state machine. The goal is to provide a different perspective in order to make debugging/understanding the grammar easier.

Answer 1

You probably want something like this: https://github.com/bkiers/rrd-antlr4 . These types of graphics are called railroad diagrams.

Answer 2

Another solution is to use ANTLRWorks 2.1. There's a view called "Syntax Diagram" included that can generate railroad diagrams of your parser rules and your lexer rules.

I'm using those images for my master thesis and the process works fine so far.