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/************************************************************************
************************************************************************
FAUST compiler
Copyright (C) 2003-2018 GRAME, Centre National de Creation Musicale
---------------------------------------------------------------------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
************************************************************************/
#include <stdlib.h>
#include <cstdlib>
#include "Text.hh"
#include "list.hh"
#include "treeTransform.hh"
using namespace std;
//------------------------------------------------------------------------------
// TreeTransform: Recursive transformation of a Tree with memoization
//------------------------------------------------------------------------------
// This is an abstract class. Derived class just have to implement the
// `transformation(t)` or `selfRec(t)` methods. The `transformation(t)` method
// should not call itself recursively directly, but exclusively via `self(t)`
// (or `mapself(lt)` for a list).
//------------------------------------------------------------------------------
Tree TreeTransform::self(Tree t)
{
if (fTrace) {
traceEnter(t);
}
fIndent++;
Tree r;
if (!fResult.get(t, r)) {
r = postprocess(transformation(t));
fResult.set(t, r);
}
fIndent--;
if (fTrace) {
traceExit(t, r);
}
return r;
}
void TreeTransform::traceMsg(std::string msg)
{
if (fTrace) {
tab(fIndent, cerr);
cerr << msg << endl;
}
}
void TreeTransform::traceMsg(std::string msg, Tree t)
{
if (fTrace) {
tab(fIndent, cerr);
cerr << msg << ": " << *t << endl;
}
}
void TreeTransform::traceEnter(Tree t)
{
tab(fIndent, cerr);
cerr << fMessage << ": " << *t << endl;
}
void TreeTransform::traceExit(Tree t, Tree r)
{
tab(fIndent, cerr);
cerr << fMessage << ": " << *t << " ==> " << *r << endl;
}
Tree TreeTransform::mapself(Tree lt)
{
if (isNil(lt)) {
return lt;
} else {
Tree e = hd(lt);
Tree f = self(e);
// std::cerr << "e: " << *e << " f: " << *f << std::endl;
return cons(f, mapself(tl(lt)));
}
}
// To be implemented by subclassess for a specific transformation on recursive signals
Tree TreeTransform::selfRec(Tree t)
{
return self(t);
}
// Apply selfRec on all recursive signals in the group
Tree TreeTransform::mapselfRec(Tree lt)
{
if (isNil(lt)) {
return lt;
} else {
return cons(selfRec(hd(lt)), mapselfRec(tl(lt)));
}
}
// This second pass is used to modify a tree after the transformation of its children
Tree TreeTransform::postprocess(Tree t)
{
return t;
}
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