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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.compiler.ast;
import javassist.compiler.TokenId;
import javassist.compiler.CompileError;
/**
* Expression.
*/
public class Expr extends ASTList implements TokenId {
/* operator must be either of:
* (unary) +, (unary) -, ++, --, !, ~,
* ARRAY, . (dot), MEMBER (static member access).
* Otherwise, the object should be an instance of a subclass.
*/
protected int operatorId;
Expr(int op, ASTree _head, ASTList _tail) {
super(_head, _tail);
operatorId = op;
}
Expr(int op, ASTree _head) {
super(_head);
operatorId = op;
}
public static Expr make(int op, ASTree oprand1, ASTree oprand2) {
return new Expr(op, oprand1, new ASTList(oprand2));
}
public static Expr make(int op, ASTree oprand1) {
return new Expr(op, oprand1);
}
public int getOperator() { return operatorId; }
public void setOperator(int op) { operatorId = op; }
public ASTree oprand1() { return getLeft(); }
public void setOprand1(ASTree expr) {
setLeft(expr);
}
public ASTree oprand2() { return getRight().getLeft(); }
public void setOprand2(ASTree expr) {
getRight().setLeft(expr);
}
public void accept(Visitor v) throws CompileError { v.atExpr(this); }
public String getName() {
int id = operatorId;
if (id < 128)
return String.valueOf((char)id);
else if (NEQ <= id && id <= ARSHIFT_E)
return opNames[id - NEQ];
else if (id == INSTANCEOF)
return "instanceof";
else
return String.valueOf(id);
}
protected String getTag() {
return "op:" + getName();
}
}
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