94 lines
3.3 KiB
Standard ML
94 lines
3.3 KiB
Standard ML
(*****************************************************************************
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* su4sml --- a 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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* datatab.sml --- a very simplistic datatab implementation
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* This file is part of su4sml.
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*
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* Copyright (c) 2008-2009 Achim D. Brucker, Germany
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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: wfcpog.sml 7256 2008-02-10 19:31:53Z brucker $ *)
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(**
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A simple Object Type (similar to the one used in Isabelle) for
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fooling the type system of SML.
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*)
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structure Object = struct type T = exn end;
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(**
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A very simplistic table using integers as key. The signature is a
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subset of the TableFun provided by Isabelle, i.e., when using a
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Isabelle based setup, 'a Datatab can be implemented/replaced
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by
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structure Datatab = TableFun(type key = int val ord = int_ord);
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*)
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signature DATATAB =
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sig
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type 'a table
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type key
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exception DUP of key
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exception SAME of key
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exception UNDEF of key
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val empty : 'a table
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val keys : 'a table -> key list
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val lookup : 'a table -> key -> 'a option
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val update : key * 'a -> 'a table -> 'a table
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end
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structure Datatab:DATATAB =
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struct
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type key = int
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type 'a table = (key * 'a) list
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exception DUP of key
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exception SAME of key
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exception UNDEF of key
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val empty=[]
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(* 'a option *)
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fun lookup t k = case (List.filter (fn (k',v) => (k'=k)) t) of
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[] => NONE
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| t' => SOME ((#2 o hd) t')
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(* 'a table *)
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fun update (k,v) [] = [(k,v)]
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| update (k,v) (x::xs) = if (#1 x) = k
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then raise DUP k (* (k,v)::xs *)
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else x::(update (k,v) xs)
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(* key list *)
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fun keys (t:'a table) = map (#1) t
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end
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