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-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2009, Gabriel Dos Reis.
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
-- - Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
--
-- - Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in
-- the documentation and/or other materials provided with the
-- distribution.
--
-- - Neither the name of The Numerical ALgorithms Group Ltd. nor the
-- names of its contributors may be used to endorse or promote products
-- derived from this software without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import vmlisp
namespace BOOT
module astr where
ncTag: %Thing -> %Symbol
ncAlist: %Thing -> %List
ncEltQ: (%List,%Thing) -> %Thing
ncPutQ: (%List,%Thing,%Thing) -> %Thing
--% Attributed Structures (astr)
-- For objects which are pairs where the first field is either just a tag
-- (an identifier) or a pair which is the tag and an association list.
-- Pick off the tag
ncTag x ==
atom x => ncBug('S2CB0031,[])
x := first x
IDENTP x => x
atom x => ncBug('S2CB0031,[])
first x
-- Pick off the property list
ncAlist x ==
atom x => ncBug('S2CB0031,[])
x := first x
IDENTP x => nil
atom x => ncBug('S2CB0031,[])
rest x
--- Get the entry for key k on x's association list
ncEltQ(x,k) ==
r := QASSQ(k,ncAlist x)
null r => ncBug ('S2CB0007,[k])
rest r
-- Put (k . v) on the association list of x and return v
-- case1: ncPutQ(x,k,v) where k is a key (an identifier), v a value
-- put the pair (k . v) on the association list of x and return v
-- case2: ncPutQ(x,k,v) where k is a list of keys, v a list of values
-- equivalent to [ncPutQ(x,key,val) for key in k for val in v]
ncPutQ(x,k,v) ==
LISTP k =>
for key in k for val in v repeat ncPutQ(x,key,val)
v
r := QASSQ(k,ncAlist x)
if null r then
r := [[k,:v], :ncAlist x]
RPLACA(x,[ncTag x,:r])
else
RPLACD(r,v)
v
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