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-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007, 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 '"sys-macros"
)package "BOOT"
--% Functions on interpreter objects
-- Interpreter objects used to be called triples because they had the
-- structure [value, type, environment]. For many years, the environment
-- was not used, so finally in January, 1990, the structure of objects
-- was changed to be (type . value). This was chosen because it was the
-- structure of objects of type Any. Sometimes the values are wrapped
-- (see the function isWrapped to see what this means physically).
-- Wrapped values are not actual values belonging to their types. An
-- unwrapped value must be evaluated to get an actual value. A wrapped
-- value must be unwrapped before being passed to a library function.
-- Typically, an unwrapped value in the interpreter consists of LISP
-- code, e.g., parts of a function that is being constructed.
-- RSS 1/14/90
-- These are the new structure functions.
objNew(val, mode) == CONS(mode,val) -- new names as of 10/14/93
objNewWrap(val, mode) == CONS(mode,wrap val)
objNewCode(val, mode) == ["CONS", MKQ mode,val ]
objSetVal(obj,val) == RPLACD(obj,val)
objSetMode(obj,mode) == RPLACA(obj,mode)
objVal obj == CDR obj
objValUnwrap obj == unwrap CDR obj
objMode obj == CAR obj
objEnv obj == $NE
objCodeVal obj == CADDR obj
objCodeMode obj == CADR obj
--% Utility Functions Used Only by the Intepreter
wrap x ==
isWrapped x => x
['WRAPPED,:x]
isWrapped x == x is ['WRAPPED,:.] or NUMBERP x or FLOATP x or CVECP x
unwrap x ==
NUMBERP x or FLOATP x or CVECP x => x
x is ["WRAPPED",:y] => y
x
wrapped2Quote x ==
x is ["WRAPPED",:y] => MKQ y
x
quote2Wrapped x ==
x is ['QUOTE,y] => wrap y
x
removeQuote x ==
x is ["QUOTE",y] => y
x
-- addQuote x ==
-- NUMBERP x => x
-- ['QUOTE,x]
--% Library compiler structures needed by the interpreter
-- Tuples and Crosses
asTupleNew(size, listOfElts) == CONS(size, LIST2VEC listOfElts)
asTupleNew0(listOfElts) == CONS(#listOfElts, LIST2VEC listOfElts)
asTupleNewCode(size, listOfElts) == ["asTupleNew", size, ["LIST", :listOfElts]]
asTupleNewCode0(listForm) == ["asTupleNew0", listForm]
asTupleSize(at) == CAR at
asTupleAsVector(at) == CDR at
asTupleAsList(at) == VEC2LIST asTupleAsVector at
--% Basic Object Type Identification
++ If x is a literal of the basic types (Integer String DoubleFloat) then
++ this function returns its type, and nil otherwise.
getBasicMode x == getBasicMode0(x,$useIntegerSubdomain)
++ Subroutine of getBasicMode.
getBasicMode0(x,useIntegerSubdomain) ==
x is nil => $EmptyMode
STRINGP x => $String
INTEGERP x =>
useIntegerSubdomain =>
x > 0 => $PositiveInteger
x = 0 => $NonNegativeInteger
$Integer
$Integer
FLOATP x => $DoubleFloat
(x='noBranch) or (x='noValue) => $NoValueMode
nil
++ If x is a literal of the basic types then returns
++ an interpreter object denoting x, and nil otherwise.
getBasicObject x ==
INTEGERP x =>
t :=
not $useIntegerSubdomain => $Integer
x > 0 => $PositiveInteger
x = 0 => $NonNegativeInteger
$Integer
objNewWrap(x,t)
STRINGP x => objNewWrap(x,$String)
FLOATP x => objNewWrap(x,$DoubleFloat)
NIL
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