Ok … I am … well … blown away.
I had thought Perl6 would be the Duke Nukem forever of programming languages. Indeed, it has been in active development for more than a decade. But you can download compilers (yes, you heard me right, compilers) for it now.
You might say “why perl” or “why perl6” or “why now, because we have #insert(language_x) and its wonderful”. Good question, I wasn’t sure why it was relevant, until I started reading some of the code.
Like this RPN calculator. Written as an executable grammar.
Or an instantiation of Greenspun’s tenth rule: a lisp interpreter. I have to ask, if the people who did this did not get the irony of doing what Greenspun indicated would be a side effect of a complex C or Fortran code … though it looks like it was specified largely correctly …
And it uses Perl syntax (extended/modified, regularized, and now parseable).
Likely performance isn’t there quite yet, I’ve not had the chance to play with it, as I am deep into other work right now.
The Perl6 grammar bits and their focus on enabling DSLs actually make one of our projects considerably easier, and solves a very long standing problem I was looking at addressing via other means. I could have used the Marpa parser series for this, but it is a bit more complex than I had hoped, and the expression of grammars in Perl6 looks much more natural.
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