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add do-while and use it in generate

db4
Doug Coleman 2008-03-19 16:16:35 -05:00
parent d04eb777ff
commit 40aab45282
1 changed files with 7 additions and 7 deletions
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14
extra/combinators/lib/lib.factor
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@ -8,13 +8,6 @@ continuations ;
IN: combinators.lib
! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
: generate ( generator predicate -- obj )
#! Call 'generator' until the result satisfies 'predicate'.
[ slip over slip ] 2keep
roll [ 2drop ] [ rot drop generate ] if ; inline
! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! Generalized versions of core combinators
! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@ -165,3 +158,10 @@ MACRO: construct-slots ( assoc tuple-class -- tuple )
: retry ( quot n -- )
[ drop ] rot compose attempt-all ; inline
: do-while ( pred body tail -- )
>r tuck 2slip r> while ;
: generate ( generator predicate -- obj )
[ dup ] swap [ dup [ nip ] unless not ] 3compose
swap [ ] do-while ;