36 lines
1.0 KiB
Factor
Executable File
36 lines
1.0 KiB
Factor
Executable File
! Copyright (C) 2007, 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: parser kernel sequences words effects
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inference.transforms combinators assocs definitions quotations
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namespaces memoize ;
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IN: macros
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: real-macro-effect ( word -- effect' )
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"declared-effect" word-prop effect-in 1 <effect> ;
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: define-macro ( word definition -- )
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over "declared-effect" word-prop effect-in length >r
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2dup "macro" set-word-prop
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2dup over real-macro-effect memoize-quot [ call ] append define
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r> define-transform ;
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: MACRO:
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(:) define-macro ; parsing
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PREDICATE: macro < word "macro" word-prop >boolean ;
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M: macro definer drop \ MACRO: \ ; ;
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M: macro definition "macro" word-prop ;
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M: macro reset-word
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[ call-next-method ] [ f "macro" set-word-prop ] bi ;
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: macro-expand ( ... word -- quot ) "macro" word-prop call ;
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: n*quot ( n seq -- seq' ) <repetition> concat >quotation ;
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: saver ( n -- quot ) \ >r <repetition> >quotation ;
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: restorer ( n -- quot ) \ r> <repetition> >quotation ;
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