Combined unparser/parser generator

Question

Is there a parser generator that also implements the inverse direction, i.e. unparsing domain objects (a.k.a. pretty-printing) from the same grammar specification? As far as I know, ANTLR does not support this.

Answer 1

I have implemented a set of Invertible Parser Combinators in Java and Kotlin. A parser is written pretty much in LL-1 style and it provides a parse- and a print-method where the latter provides the pretty printer.

You can find the project here: https://github.com/searles/parsing Here is a tutorial: https://github.com/searles/parsing/blob/master/tutorial.md And here is a parser/pretty printer for mathematical expressions: https://github.com/searles/parsing/blob/master/src/main/java/at/searles/demo/DemoInvert.kt