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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
\* */
// $Id$
package scalac.ast;
import java.io.*;
import java.util.*;
import scalac.*;
import scalac.util.*;
import Tree.*;
/** Class to traverse a tree without modifying it.
*
* @author Michel Schinz
*/
public class Traverser {
public Traverser() {}
// this should be removed in the future
public Traverser(Global global) {}
public void traverse(Unit unit) {
traverse(unit.body);
}
public void traverse(Tree tree) {
switch (tree) {
case Bad():
case Empty:
case Ident(_):
case Literal(_):
return;
case ClassDef(int mods,
Name name,
TypeDef[] tparams,
ValDef[][] vparams,
Tree tpe,
Template impl):
traverse(tparams);
traverse(vparams);
traverse(tpe);
traverse(impl);
return;
case PackageDef(Tree packaged, Template impl) :
traverse(packaged);
traverse(impl);
return;
case ModuleDef(int mods, Name name, Tree tpe, Template impl):
traverse(tpe);
traverse(impl);
return;
case ValDef(int mods, Name name, Tree tpe, Tree rhs):
traverse(tpe);
traverse(rhs);
return;
case PatDef(int mods, Tree pat, Tree rhs):
traverse(pat);
traverse(rhs);
return;
case DefDef(int mods,
Name name,
TypeDef[] tparams,
ValDef[][] vparams,
Tree tpe,
Tree rhs):
traverse(tparams);
traverse(vparams);
traverse(tpe);
traverse(rhs);
return;
case TypeDef(int mods, Name name, TypeDef[] tparams, Tree rhs):
traverse(tparams);
traverse(rhs);
return;
case Import(Tree expr, Name[] selectors):
traverse(expr);
return;
case CaseDef(Tree pat, Tree guard, Tree body):
traverse(pat);
traverse(guard);
traverse(body);
return;
case Template(Tree[] baseClasses, Tree[] body):
traverse(baseClasses);
traverse(body);
return;
case LabelDef(Tree[] params,Tree rhs):
traverse(params);
traverse(rhs);
return;
case Block(Tree[] stats):
traverse(stats);
return;
case Tuple(Tree[] trees):
traverse(trees);
return;
case Visitor(CaseDef[] cases):
traverse(cases);
return;
case Function(ValDef[] vparams, Tree body):
traverse(vparams);
traverse(body);
return;
case Assign(Tree lhs, Tree rhs):
traverse(lhs);
traverse(rhs);
return;
case If(Tree cond, Tree thenp, Tree elsep):
traverse(cond);
traverse(thenp);
traverse(elsep);
return;
case New(Template templ):
traverse(templ);
return;
case Typed(Tree expr, Tree tpe):
traverse(expr);
traverse(tpe);
return;
case TypeApply(Tree fun, Tree[] tparams):
traverse(fun);
traverse(tparams);
return;
case Apply(Tree fun, Tree[] vparam):
traverse(fun);
traverse(vparam);
return;
case Super(Tree tpe):
traverse(tpe);
return;
case This(Tree qualifier):
traverse(qualifier);
return;
case Select(Tree qualifier, Name selector):
traverse(qualifier);
return;
case SingletonType(Tree ref):
traverse(ref);
return;
case SelectFromType(Tree qualifier, Name selector):
traverse(qualifier);
return;
case FunType(Tree[] argtpes, Tree restpe):
traverse(argtpes);
traverse(restpe);
return;
case CompoundType(Tree[] baseTypes, Tree[] refinements):
traverse(baseTypes);
traverse(refinements);
return;
case TupleType(Tree[] types):
traverse(types);
return;
case AppliedType(Tree tpe, Tree[] args):
traverse(tpe);
traverse(args);
return;
case CovariantType(Tree tpe):
traverse(tpe);
return;
default:
throw new ApplicationError("unknown node " + tree);
}
}
public void traverse(Tree[] array) {
for (int i = 0; i < array.length; ++i)
traverse(array[i]);
}
public void traverse(Tree[][] array) {
for (int i = 0; i < array.length; ++i)
traverse(array[i]);
}
}
|
