.NET DSL implementation.
Boo is described by its receptors as:
a new object-oriented statically typed programming language for a common language infrastructure with python-inspired syntax and a particular emphasis on language and compiler extensibility.
Basically, this is an alternative to C #: also compiled, but much more flexible so that you can dynamically tune new language constructs. Expression trees are only part of what is related.
By placing Boo somewhere in your pipeline, as Rhino.DSL does, you expose a lot of versatility that doesn't even need a bloated or high performance hang (it's still compiled by the bytecode that runs).
If you look at unit tests on Rhino.DSL , you get a quick idea of what is possible.
One note: all the repositories mentioned are currently inactive (there has been no activity for the last year), but IMHO that does not devalue their practical use.
Hope this helps you.
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