55 lines
1.9 KiB
Factor
55 lines
1.9 KiB
Factor
! :folding=indent:collapseFolds=0:
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! $Id$
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!
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! Copyright (C) 2003, 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: logic USE: kernel USE: stack
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: ? ( cond t f -- t/f )
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#! Push t if cond is true, otherwise push f.
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rot [ drop ] [ nip ] ifte ; inline
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: and ( a b -- a&b )
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#! Logical and.
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f ? ; inline
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: not ( a -- a )
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#! Pushes f is the object is not f, t if the object is f.
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f t ? ; inline
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: or ( a b -- a|b)
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#! Logical or.
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t swap ? ; inline
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: xor ( a b -- a^b )
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#! Logical exclusive or.
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dup not swap ? ; inline
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: >boolean t f ? ; inline
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: replace ( obj old new -- obj/new )
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#! If obj is equal to old, drop it and push new.
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>r dupd = [ drop r> ] [ r> drop ] ifte ;
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