Am Dienstag, 6. April 2004 20:36 schrieben Sie:
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Will such a preprocessor work on source code like cpp does or on a syntax tree?
On source code, at least for now. There's no plan, ATM, to include a parser with Distribution.Build. It could be useful, but I expect that we want to pass such work onto the compilers / interpreters.
Can you explain the syntax tree you picture for this? Where will such a tree come from?
I have no detailed picture at the moment.
The latter would be better,
Why?
Look at XML. You are able to include XML code from other files but the code you import must be a complete XML element. Similarily, the brances of a Haskell #ifdef should be producable out of a non-terminal, and, more specific, they should be producable out of the same non-terminal. With these restrictions, one would be able to guarantee syntactical correctness without evaluating the #ifdef conditions, for example.
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Wolfgang