Full macro expansion.
- (expand* FORM) procedure
Returns the full expansion of FROM.
- (pretty-print-expand* FORM) procedure
Pretty-prints the full expansion of FROM.
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.
- Initial release.
Copyright (C) 2009 Kon Lovett. All rights reserved.
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