77 lines
3.0 KiB
Standard ML
77 lines
3.0 KiB
Standard ML
(*****************************************************************************
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* su4sml --- an SML repository for managing (Secure)UML/OCL models
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* http://projects.brucker.ch/su4sml/
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*
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* listeq.sml ---
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* This file is part of su4sml.
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*
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* Copyright (c) 2005-2007, ETH Zurich, Switzerland
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*
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* All rights reserved.
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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
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* * Neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************)
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(* $Id$ *)
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(** auxiliary functions on lists of eqtypes.*)
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signature LISTEQ =
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sig
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(** checks whether the list xs includes the value x. *)
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val includes: ''a list -> ''a -> bool
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(** checks whether the intersection of xs and ys is nonempty. *)
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val overlaps: ''a list -> ''a list -> bool
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(** checks whether the lists are disjunct, i.e., do not overlap. *)
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val disjunct: ''a list -> ''a list -> bool
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(** removes duplicate elements. *)
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val makeDistinct: ''a list -> ''a list
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end
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structure ListEq:LISTEQ =
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struct
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open List
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(** checks whether the list xs includes the value x. *)
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fun includes xs x = exists (fn y => y=x) xs
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(** checks whether the intersection of xs and ys is nonempty. *)
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fun overlaps xs ys = includes (map (includes xs) ys) true
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(** checks whether the lists are disjunct, i.e., do not overlap. *)
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fun disjunct xs ys = not (overlaps xs ys)
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(** removes duplicate elements. *)
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fun makeDistinct [] = []
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| makeDistinct (h::t) = h::makeDistinct (List.filter (fn x => not (x=h)) t)
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end
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