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Rascal is an open source grammar language created in 2013.

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Rascal is an experimental domain specific language for metaprogramming, such as static code analysis, program transformation and implementation of domain specific languages. It is a general meta language in the sense that it does not have a bias for any particular software language. It includes primitives from relational calculus and term rewriting. Read more on Wikipedia...

Example from Linguist:
module Syntax extend lang::std::Layout; extend lang::std::Id; start syntax Machine = machine: State+ states; syntax State = @Foldable state: "state" Id name Trans* out; syntax Trans = trans: Id event ":" Id to;

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