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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
namespace BOOT
--% Stream Utilities
npNull x== StreamNull x
StreamNull x==
null x or EQCAR (x,"nullstream") => true
while EQCAR(x,"nonnullstream") repeat
st:=APPLY(CADR x,CDDR x)
RPLACA(x,CAR st)
RPLACD(x,CDR st)
EQCAR(x,"nullstream")
Delay(f,x)==cons("nonnullstream",[f,:x])
StreamNil:= ["nullstream"]
incRgen s==Delay(function incRgen1,[s])
incRgen1(:z)==
[s]:=z
a:=shoeread_-line s
if NULL a
then (CLOSE s;StreamNil)
else cons(a,incRgen s)
incIgen n==Delay(function incIgen1,[n])
incIgen1(:z)==
[n]:=z
n:=n+1
cons(n,incIgen n)
incZip(g,f1,f2)==Delay(function incZip1,[g,f1,f2])
incZip1(:z)==
[g,f1,f2]:=z
StreamNull f1 => StreamNil
StreamNull f2 => StreamNil
cons(FUNCALL(g,car f1,car f2),incZip(g,cdr f1,cdr f2))
incAppend(x,y)==Delay(function incAppend1,[x,y])
incAppend1(:z)==
[x,y]:=z
if StreamNull x
then if StreamNull y
then StreamNil
else y
else cons(car x,incAppend(cdr x,y))
next(f,s)==Delay(function next1,[f,s])
next1(:z)==
[f,s]:=z
StreamNull s=> StreamNil
h:= APPLY(f, [s])
incAppend(car h,next(f,cdr h))
nextown(f,g,s)==Delay(function nextown1,[f,g,s])
nextown1 (:z)==
[f,g,s]:=z
StreamNull s=>
spadcall1 g
StreamNil
StreamNull s
h:=spadcall2 (f, s)
incAppend(car h,nextown(f,g,cdr h))
nextown2(f,g,e,x)==nextown(cons(f,e),cons(g,e),x)
spadcall1(g)==
[impl, :env] := g
APPLY(impl, [env])
spadcall2(f,args) ==
[impl, :env] := f
APPLY(impl, [args, env])
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