tree.java

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        }

        public void accept(Visitor v) {
            v.visitAssignop(this);
        }
    }

    /**
      * A unary operation.
      */
    public static class Unary extends Tree {
        public Tree arg;
        public Symbol operator;

        public Unary(int opcode, Tree arg, Symbol operator) {
            super(opcode);
            this.arg = arg;
            this.operator = operator;
        }

        public void accept(Visitor v) {
            v.visitUnary(this);
        }
    }

    /**
      * A binary operation.
      */
    public static class Binary extends Tree {
        public Tree lhs;
        public Tree rhs;
        public Symbol operator;

        public Binary(int opcode, Tree lhs, Tree rhs, Symbol operator) {
            super(opcode);
            this.lhs = lhs;
            this.rhs = rhs;
            this.operator = operator;
        }

        public void accept(Visitor v) {
            v.visitBinary(this);
        }
    }

    /**
      * A type cast.
      */
    public static class TypeCast extends Tree {
        public Tree clazz;
        public Tree expr;

        public TypeCast(Tree clazz, Tree expr) {
            super(TYPECAST);
            this.clazz = clazz;
            this.expr = expr;
        }

        public void accept(Visitor v) {
            v.visitTypeCast(this);
        }
    }

    /**
      * A type test.
      */
    public static class TypeTest extends Tree {
        public Tree expr;
        public Tree clazz;

        public TypeTest(Tree expr, Tree clazz) {
            super(TYPETEST);
            this.expr = expr;
            this.clazz = clazz;
        }

        public void accept(Visitor v) {
            v.visitTypeTest(this);
        }
    }

    /**
      * An array selection
      */
    public static class Indexed extends Tree {
        public Tree indexed;
        public Tree index;

        public Indexed(Tree indexed, Tree index) {
            super(INDEXED);
            this.indexed = indexed;
            this.index = index;
        }

        public void accept(Visitor v) {
            v.visitIndexed(this);
        }
    }

    /**
      * Selects through packages and classes
      * @param selected selected Tree hierarchie
      * @param selector name of field to select thru
      * @param sym symbol of the selected class
      */
    public static class Select extends Tree {
        public Tree selected;
        public Name name;
        public Symbol sym;

        public Select(Tree selected, Name name, Symbol sym) {
            super(SELECT);
            this.selected = selected;
            this.name = name;
            this.sym = sym;
        }

        public void accept(Visitor v) {
            v.visitSelect(this);
        }
    }

    /**
      * An identifier
      * @param idname the name
      * @param sym the symbol
      */
    public static class Ident extends Tree {
        public Name name;
        public Symbol sym;

        public Ident(Name name, Symbol sym) {
            super(IDENT);
            this.name = name;
            this.sym = sym;
        }

        public void accept(Visitor v) {
            v.visitIdent(this);
        }
    }

    /**
      * A constant value given literally.
      * @param value value representation
      */
    public static class Literal extends Tree {
        public int typetag;
        public Object value;

        public Literal(int typetag, Object value) {
            super(LITERAL);
            this.typetag = typetag;
            this.value = value;
        }

        public void accept(Visitor v) {
            v.visitLiteral(this);
        }
    }

    /**
      * Identifies a basic type.
      * @param tag the basic type id
      * @see SemanticConstants
      */
    public static class TypeIdent extends Tree {
        public int typetag;

        public TypeIdent(int typetag) {
            super(TYPEIDENT);
            this.typetag = typetag;
        }

        public void accept(Visitor v) {
            v.visitTypeIdent(this);
        }
    }

    /**
      * An array type, A[]
      */
    public static class TypeArray extends Tree {
        public Tree elemtype;

        public TypeArray(Tree elemtype) {
            super(TYPEARRAY);
            this.elemtype = elemtype;
        }

        public void accept(Visitor v) {
            v.visitTypeArray(this);
        }
    }

    /**
      * A formal class parameter.
      * @param name name
      * @param bounds bounds
      */
    public static class TypeParameter extends Tree {

        TypeParameter() {
            super(0);
        }
        public static final List emptyList = new List();
    }

    public static class Erroneous extends Tree {

        public Erroneous() {
            super(ERRONEOUS);
        }

        public void accept(Visitor v) {
            v.visitErroneous(this);
        }
    }

    /**
      * An interface for tree factories
      */
    public interface Factory {

        TopLevel TopLevel(Tree pid, List defs);

        Import Import(Tree qualid);

        ClassDef ClassDef(long flags, Name name, List typarams, Tree extending,
                List implementing, List defs);

        MethodDef MethodDef(long flags, Name name, Tree restype, List typarams,
                List params, List thrown, Block body);

        VarDef VarDef(long flags, Name name, Tree vartype, Tree init);

        Skip Skip();

        Block Block(long flags, List stats);

        DoLoop DoLoop(Tree body, Tree cond);

        WhileLoop WhileLoop(Tree cond, Tree body);

        ForLoop ForLoop(List init, Tree cond, List step, Tree body);

        Labelled Labelled(Name label, Tree body);

        Switch Switch(Tree selector, List cases);

        Case Case(Tree pat, List stats);

        Synchronized Synchronized(Tree lock, Tree body);

        Try Try(Tree body, List catchers, Tree finalizer);

        Catch Catch(VarDef param, Tree body);

        Conditional Conditional(Tree cond, Tree thenpart, Tree elsepart);

        If If(Tree cond, Tree thenpart, Tree elsepart);

        Exec Exec(Tree expr);

        Break Break(Name label);

        Continue Continue(Name label);

        Return Return(Tree expr);

        Throw Throw(Tree expr);

        Apply Apply(Tree fn, List args);

        NewClass NewClass(Tree encl, Tree clazz, List args, ClassDef def);

        NewArray NewArray(Tree elemtype, List dims, List elems);

        Parens Parens(Tree expr);

        Assign Assign(Tree lhs, Tree rhs);

        Assignop Assignop(int opcode, Tree lhs, Tree rhs);

        Unary Unary(int opcode, Tree arg);

        Binary Binary(int opcode, Tree lhs, Tree rhs);

        TypeCast TypeCast(Tree expr, Tree type);

        TypeTest TypeTest(Tree expr, Tree clazz);

        Indexed Indexed(Tree indexed, Tree index);

        Select Select(Tree selected, Name selector);

        Ident Ident(Name idname);

        Literal Literal(int tag, Object value);

        TypeIdent TypeIdent(int typetag);

        TypeArray TypeArray(Tree elemtype);

        Erroneous Erroneous();
    }

    /**
      * A generic visitor class for trees.
      */
    public static abstract class Visitor {

        public Visitor() {
            super();
        }

        public void visitTopLevel(TopLevel that) {
            visitTree(that);
        }

        public void visitImport(Import that) {
            visitTree(that);
        }

        public void visitClassDef(ClassDef that) {
            visitTree(that);
        }

        public void visitMethodDef(MethodDef that) {
            visitTree(that);
        }

        public void visitVarDef(VarDef that) {
            visitTree(that);
        }

        public void visitSkip(Skip that) {
            visitTree(that);
        }

        public void visitBlock(Block that) {
            visitTree(that);
        }

        public void visitDoLoop(DoLoop that) {
            visitTree(that);
        }

        public void visitWhileLoop(WhileLoop that) {
            visitTree(that);
        }

        public void visitForLoop(ForLoop that) {
            visitTree(that);
        }

        public void visitLabelled(Labelled that) {
            visitTree(that);
        }

        public void visitSwitch(Switch that) {
            visitTree(that);
        }

        public void visitCase(Case that) {
            visitTree(that);
        }

        public void visitSynchronized(Synchronized that) {
            visitTree(that);
        }

        public void visitTry(Try that) {
            visitTree(that);
        }

        public void visitCatch(Catch that) {
            visitTree(that);
        }

        public void visitConditional(Conditional that) {
            visitTree(that);
        }

        public void visitIf(If that) {
            visitTree(that);
        }

        public void visitExec(Exec that) {
            visitTree(that);
        }

        public void visitBreak(Break that) {
            visitTree(that);
        }

        public void visitContinue(Continue that) {
            visitTree(that);
        }

        public void visitReturn(Return that) {
            visitTree(that);
        }

        public void visitThrow(Throw that) {
            visitTree(that);
        }

        public void visitAssert(Assert that) {
            visitTree(that);
        }

        public void visitApply(Apply that) {
            visitTree(that);
        }

        public void visitNewClass(NewClass that) {
            visitTree(that);
        }

        public void visitNewArray(NewArray that) {
            visitTree(that);
        }

        public void visitParens(Parens that) {
            visitTree(that);
        }

        public void visitAssign(Assign that) {
            visitTree(that);
        }

        public void visitAssignop(Assignop that) {
            visitTree(that);
        }

        public void visitUnary(Unary that) {
            visitTree(that);
        }

        public void visitBinary(Binary that) {
            visitTree(that);
        }

        public void visitTypeCast(TypeCast that) {
            visitTree(that);
        }

        public void visitTypeTest(TypeTest that) {
            visitTree(that);
        }

        public void visitIndexed(Indexed that) {
            visitTree(that);
        }

        public void visitSelect(Select that) {
            visitTree(that);
        }

        public void visitIdent(Ident that) {
            visitTree(that);
        }

        public void visitLiteral(Literal that) {
            visitTree(that);
        }

        public void visitTypeIdent(TypeIdent that) {
            visitTree(that);
        }

        public void visitTypeArray(TypeArray that) {
            visitTree(that);
        }

        public void visitErroneous(Erroneous that) {
            visitTree(that);
        }

        public void visitTree(Tree that) {
            assert false;
        }
    }
}