chickadee » prefixes

Rationale

This module implements only one macro, with-prefix, and ony procedure, a variant of gensym with memory.

The former does the renaming in explicit-renaming-macros automatically. You need only prefix each symbol you want to be renamed of the macro-code and wrap the whole shebang with that macro. The necessary let defining the prefixed symbols as renamed ones than replaces with-prefix.

An example will make this more clear:

 (with-prefix (% gensym)
   `(1 ,%a (,%b ,%a) ,%c d))

rewrites to

 (let ((%a (gensym 'a)) (%b (gensym 'b)) (%c (gensym 'c)))
   `(1 ,%a (,%b ,%a) ,%c d))

To be able to test this replacement, you need gensym* instead of gensym.

API

with-prefix





(with-prefix (prefix mapper) symtree)syntax


extracts those symbols from symtree, which are prefixed with prefix, and prepends symtree with bindings of the prefixed syms to prefix stripped versions mapped with mapper, e.g. gensym, rename, inject.
gensym*




gensym* symprocedure


a variant of gensym with memory, i.e. it will always produce the same gensym for its only argument.
prefixes




prefixesprocedure






prefixes symprocedure


with sym: documentation of exported symbol without sym: list of exported symbols
Examples


(import prefixes)

(gensym* 'a)
;-> (gensym* (quote a))

(with-prefix (% gensym*) `(1 ,%a (,%b ,%a) ,%c d))
;-> (let ((%a (gensym* (quote a))) (%b (gensym* (quote b))) (%c (gensym* (quote c)))) (quasiquote (1 (unquote %a) ((unquote %b) (unquote %a)) (unquote %c) d)))

(equal?
  (with-prefix (% gensym*) `(1 ,%a (,%b ,%a) ,%c d))
  (let ((%a (gensym* 'a)) (%b (gensym* 'b)) (%c (gensym* 'c)))
    `(1 ,%a (,%b a) ,%c d)))
;-> #f

(equal?
  (with-prefix (% gensym*) `(1 ,%a (,%b a) ,%c d))
  (let ((%a (gensym* 'a)) (%b (gensym* 'b)) (%c (gensym* 'c)))
    `(1 ,%a (,%b ,%a) ,%c d)))
;-> #f

Requirements
None
Last update
Mar 24, 2024
Author
Juergen Lorenz
License
Copyright (c) 2022-2023 , Juergen Lorenz, ju (at) jugilo (dot) de All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Version history
1.0


initial check in






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