81 lines
2.6 KiB
Factor
81 lines
2.6 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) 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: 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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! Predicate metaclass for generalized predicate dispatch.
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SYMBOL: predicate
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: predicate-dispatch ( class definition existing -- dispatch )
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[
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\ dup ,
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rot "predicate" word-property ,
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swap , , \ ifte ,
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] make-list ;
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: (predicate-method) ( class generic definition type# -- )
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rot "vtable" word-property
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[ vector-nth predicate-dispatch ] 2keep
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set-vector-nth ;
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: predicate-method ( class generic definition -- )
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pick builtin-supertypes [
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>r 3dup r> (predicate-method)
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] each 3drop ;
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predicate [
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predicate-method
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] "define-method" set-word-property
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predicate [
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"superclass" word-property builtin-supertypes
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] "builtin-supertypes" set-word-property
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: define-predicate ( class predicate definition -- )
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rot "superclass" word-property "predicate" word-property
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[ \ dup , , , [ drop f ] , \ ifte , ] make-list
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define-compound ;
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: PREDICATE: ( -- class predicate definition )
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#! Followed by a superclass name, then a class name.
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scan-word
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CREATE
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dup rot "superclass" set-word-property
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dup predicate "metaclass" set-word-property
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dup predicate-word
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[ dupd "predicate" set-word-property ] keep
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[ define-predicate ] [ ] ; parsing
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