Full macro expansion.
- expand* FORMprocedure
Returns the full expansion of FORM.
- pretty-print-expand* FORMprocedure
Pretty-prints the full expansion of FORM.
ppexpand* is a synonym.
Adds the toplevel command ,x* FORM.
csi -R expand-full
expand-full simply invokes the core expand procedure iteratively until nothing remains to be expanded. Unfortunately, each expand step returns the expansion of the outermost macro only, discarding the syntactic environment used in that expansion.
This means that if the expansion uses any macros that were introduced in the expansion or if it uses macros that are only available within the module in which the macro was defined, the next expansion step won't know about these macros, and will fail to expand correctly.
The upshot of all this is that expand-full is only useful for expansion of trivial macros. More specifically, it works only for macros that expand only to other top-level macros. This includes recursive macros which expand to self-invocations. Unfortunately, this is a fundamental limitation of the core expand form, which means it's an unfixable problem for this egg.
This egg is hosted on the CHICKEN Subversion repository:
If you want to check out the source code repository of this egg and you are not familiar with Subversion, see this page.
- CHICKEN 5 release.
- Needs vector-lib
- Fix expand* - expand vector & condition on a proper-list. Better csi help message.
- Initial release.
Copyright (C) 2009 Kon Lovett. All rights reserved.
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