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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.transformer;
import java.io.*;
import java.util.*;
import scalac.*;
import scalac.util.*;
import scalac.ast.*;
import scalac.symtab.*;
import Tree.*;
/** A default transformer class which also maintains owner information
*
* @author Martin Odersky
* @version 1.0
*/
public class OwnerTransformer extends Transformer {
protected Symbol currentOwner;
public OwnerTransformer(Global global) {
super(global);
}
public void apply(Unit unit) {
currentOwner = global.definitions.ROOT_CLASS;
unit.body = transform(unit.body);
}
public Tree transform(Tree tree, Symbol owner) {
Symbol prevOwner = currentOwner;
currentOwner = owner;
Tree tree1 = transform(tree);
currentOwner = prevOwner;
return tree1;
}
public AbsTypeDef[] transform(AbsTypeDef[] params, Symbol owner) {
Symbol prevOwner = currentOwner;
currentOwner = owner;
AbsTypeDef[] res = transform(params);
currentOwner = prevOwner;
return res;
}
public ValDef[][] transform(ValDef[][] params, Symbol owner) {
Symbol prevOwner = currentOwner;
currentOwner = owner;
ValDef[][] res = transform(params);
currentOwner = prevOwner;
return res;
}
public Template transform(Template templ, Symbol owner) {
Symbol prevOwner = currentOwner;
if (owner.kind == Kinds.CLASS)
currentOwner = owner.primaryConstructor();
Tree[] parents1 = transform(templ.parents);
currentOwner = owner;
Tree[] body1 = transformTemplateStats(templ.body, templ.symbol());
currentOwner = prevOwner;
return copy.Template(templ, parents1, body1);
}
public Tree[] transformTemplateStats(Tree[] ts, Symbol tsym) {
Tree[] ts1 = ts;
for (int i = 0; i < ts.length; i++) {
Tree t = transformTemplateStat(ts[i], tsym);
if (t != ts[i] && ts1 == ts) {
ts1 = new Tree[ts.length];
System.arraycopy(ts, 0, ts1, 0, i);
}
ts1[i] = t;
}
return ts1;
}
public Tree transformTemplateStat(Tree stat, Symbol tsym) {
return transform(stat, tsym);
}
public Tree transform(Tree tree) {
switch(tree) {
case PackageDef(Tree packaged, Template impl):
return copy.PackageDef(
tree,
transform(packaged),
transform(impl, packaged.symbol()));
case ClassDef(_, _, AbsTypeDef[] tparams, ValDef[][] vparams, Tree tpe, Template impl):
Symbol symbol = tree.symbol();
return copy.ClassDef(
tree, symbol,
transform(tparams, symbol.primaryConstructor()),
transform(vparams, symbol.primaryConstructor()),
transform(tpe),
transform(impl, symbol));
case ModuleDef(_, _, Tree tpe, Template impl):
Symbol symbol = tree.symbol();
return copy.ModuleDef(
tree, symbol,
transform(tpe),
transform(impl, symbol.moduleClass()));
case DefDef(_, _, AbsTypeDef[] tparams, ValDef[][] vparams, Tree tpe, Tree rhs):
Symbol symbol = tree.symbol();
return copy.DefDef(
tree, symbol,
transform(tparams, symbol),
transform(vparams, symbol),
transform(tpe, symbol),
transform(rhs, symbol));
case ValDef(_, _, Tree tpe, Tree rhs):
Symbol symbol = tree.symbol();
return copy.ValDef(
tree, symbol,
transform(tpe),
transform(rhs, symbol));
case AbsTypeDef(int mods, Name name, Tree rhs, Tree lobound):
Symbol symbol = tree.symbol();
return copy.AbsTypeDef(
tree, symbol,
transform(rhs, symbol),
transform(lobound, symbol));
case AliasTypeDef(int mods, Name name, AbsTypeDef[] tparams, Tree rhs):
Symbol symbol = tree.symbol();
return copy.AliasTypeDef(
tree, symbol,
transform(tparams, symbol),
transform(rhs, symbol));
default:
return super.transform(tree);
}
}
}
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