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-- Copyright (c) 1991-2002, The Numerical Algorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2008, 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.
module pile
import includer
import scanner
)package "BOOTTRAN"
shoeFirstTokPosn t== shoeTokPosn CAAR t
shoeLastTokPosn t== shoeTokPosn CADR t
shoePileColumn t==CDR shoeTokPosn CAAR t
-- s is a token-dq-stream
shoePileInsert (s)==
if bStreamNull s
then cons([],s)
else
toktype:=shoeTokType CAAAR s
if toktype ="LISP" or toktype = "LINE"
then cons([car s],cdr s)
else
a:=shoePileTree(-1,s)
cons([a.2],a.3)
shoePileTree(n,s)==
if bStreamNull s
then [false,n,[],s]
else
[h,t]:=[car s,cdr s]
hh:=shoePileColumn h
if hh > n
then shoePileForests(h,hh,t)
else [false,n,[],s]
eqshoePileTree(n,s)==
if bStreamNull s
then [false,n,[],s]
else
[h,t]:=[car s,cdr s]
hh:=shoePileColumn h
if hh = n
then shoePileForests(h,hh,t)
else [false,n,[],s]
shoePileForest(n,s)==
[b,hh,h,t]:= shoePileTree(n,s)
if b
then
[h1,t1]:=shoePileForest1(hh,t)
[cons(h,h1),t1]
else [[],s]
shoePileForest1(n,s)==
[b,n1,h,t]:= eqshoePileTree(n,s)
if b
then
[h1,t1]:=shoePileForest1(n,t)
[cons(h,h1),t1]
else [[],s]
shoePileForests(h,n,s)==
[h1,t1]:=shoePileForest(n,s)
if bStreamNull h1
then [true,n,h,s]
else shoePileForests(shoePileCtree(h,h1),n,t1)
shoePileCtree(x,y)==dqAppend(x,shoePileCforest y)
-- only enshoePiles forests with >=2 trees
shoePileCforest x==
if null x
then []
else if null cdr x
then car x
else
a:=car x
b:=shoePileCoagulate(a,rest x)
if null cdr b
then car b
else shoeEnPile shoeSeparatePiles b
shoePileCoagulate(a,b)==
if null b
then [a]
else
c:=car b
if EQ(shoeTokPart CAAR c,"THEN") or EQ(shoeTokPart CAAR c,"ELSE")
then shoePileCoagulate (dqAppend(a,c),cdr b)
else
d:=CADR a
e:=shoeTokPart d
if EQCAR(d,"KEY") and
(GET(e,"SHOEINF") or EQ(e,"COMMA") or EQ(e,"SEMICOLON"))
then shoePileCoagulate(dqAppend(a,c),cdr b)
else cons(a,shoePileCoagulate(c,rest b))
shoeSeparatePiles x==
if null x
then []
else if null cdr x
then car x
else
a:=car x
semicolon:=dqUnit
shoeTokConstruct("KEY", "BACKSET",shoeLastTokPosn a)
dqConcat [a,semicolon,shoeSeparatePiles cdr x]
shoeEnPile x==
dqConcat [dqUnit shoeTokConstruct("KEY","SETTAB",shoeFirstTokPosn x),
x, _
dqUnit shoeTokConstruct("KEY","BACKTAB",shoeLastTokPosn x)]
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