49 lines
1.3 KiB
Factor
49 lines
1.3 KiB
Factor
! Copyright (C) 2006 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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IN: words
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USING: kernel math namespaces sequences strings generic ;
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TUPLE: effect in out terminated? ;
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C: effect
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[
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over { "*" } sequence=
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[ nip t swap set-effect-terminated? ]
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[ set-effect-out ] if
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] keep
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[ set-effect-in ] keep ;
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: effect-height ( effect -- n )
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dup effect-out length swap effect-in length - ;
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: effect<= ( eff1 eff2 -- ? )
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2dup [ effect-terminated? ] 2apply = >r
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2dup [ effect-in length ] 2apply <= >r
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[ effect-height ] 2apply number= r> and r> and ;
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GENERIC: (stack-picture) ( obj -- str )
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M: string (stack-picture) ;
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M: word (stack-picture) word-name ;
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M: integer (stack-picture) drop "object" ;
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: stack-picture ( seq -- string )
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[ [ (stack-picture) % CHAR: \s , ] each ] "" make ;
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: effect>string ( effect -- string )
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[
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"( " %
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dup effect-in stack-picture %
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"-- " %
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dup effect-out stack-picture %
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effect-terminated? [ "* " % ] when
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")" %
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] "" make ;
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: stack-effect ( word -- effect/f )
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dup "declared-effect" word-prop [ ] [
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dup "inferred-effect" word-prop [ ] [ drop f ] ?if
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] ?if ;
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M: effect clone
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[ effect-in clone ] keep effect-out clone <effect> ;
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