77 lines
2.5 KiB
Factor
77 lines
2.5 KiB
Factor
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! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2005 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: generic
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USE: errors
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USE: hashtables
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USE: kernel
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USE: lists
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USE: namespaces
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USE: parser
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USE: strings
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USE: words
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USE: vectors
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USE: math
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! Complement metaclass, contains all objects not in a certain class.
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SYMBOL: complement
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complement [
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"complement" word-property builtin-supertypes
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num-types count
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difference
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] "builtin-supertypes" set-word-property
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complement [
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( generic vtable definition class -- )
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drop num-types [ >r 3dup r> add-method ] times* 3drop
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] "add-method" set-word-property
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complement 90 "priority" set-word-property
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complement [
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swap "complement" word-property
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swap "complement" word-property
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class< not
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] "class<" set-word-property
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: complement-predicate ( complement -- list )
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"predicate" word-property [ not ] append ;
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: define-complement ( class predicate complement -- )
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[ complement-predicate define-compound ] keep
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dupd "complement" set-word-property
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complement define-class ;
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: COMPLEMENT: ( -- class predicate definition )
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#! Followed by a class name, then a complemented class.
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CREATE
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dup intern-symbol
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dup predicate-word
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[ dupd unit "predicate" set-word-property ] keep
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scan-word define-complement ; parsing
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