63 lines
2.2 KiB
Factor
63 lines
2.2 KiB
Factor
! :folding=indent:collapseFolds=1:
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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: lists
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USE: kernel
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USE: namespaces
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: cons@ ( x var -- )
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#! Prepend x to the list stored in var.
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[ cons ] change ;
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: unique@ ( elem var -- )
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#! Prepend an element to the proper list stored in a
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#! variable if it is not already contained in the list.
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[ unique ] change ;
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SYMBOL: list-buffer
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: make-rlist ( quot -- list )
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#! Call a quotation. The quotation can call , to prepend
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#! objects to the list that is returned when the quotation
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#! is done.
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[ list-buffer off call list-buffer get ] with-scope ;
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inline
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: make-list ( quot -- list )
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#! Return a list whose entries are in the same order that ,
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#! was called.
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make-rlist reverse ; inline
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: , ( obj -- )
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#! Append an object to the currently constructing list.
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list-buffer cons@ ;
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: unique, ( obj -- )
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#! Append an object to the currently constructing list, only
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#! if the object does not already occur in the list.
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list-buffer unique@ ;
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