1 /* 2 * Javassist, a Java-bytecode translator toolkit. 3 * Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved. 4 * 5 * The contents of this file are subject to the Mozilla Public License Version 6 * 1.1 (the "License"); you may not use this file except in compliance with 7 * the License. Alternatively, the contents of this file may be used under 8 * the terms of the GNU Lesser General Public License Version 2.1 or later. 9 * 10 * Software distributed under the License is distributed on an "AS IS" basis, 11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 12 * for the specific language governing rights and limitations under the 13 * License. 14 */ 15 16 package javassist.compiler.ast; 17 18 import javassist.compiler.TokenId; 19 import javassist.compiler.CompileError; 20 21 /** 22 * Expression. 23 */ 24 public class Expr extends ASTList implements TokenId { 25 /* operator must be either of: 26 * (unary) +, (unary) -, ++, --, !, ~, 27 * ARRAY, . (dot), MEMBER (static member access). 28 * Otherwise, the object should be an instance of a subclass. 29 */ 30 31 protected int operatorId; 32 33 Expr(int op, ASTree _head, ASTList _tail) { 34 super(_head, _tail); 35 operatorId = op; 36 } 37 38 Expr(int op, ASTree _head) { 39 super(_head); 40 operatorId = op; 41 } 42 43 public static Expr make(int op, ASTree oprand1, ASTree oprand2) { 44 return new Expr(op, oprand1, new ASTList(oprand2)); 45 } 46 47 public static Expr make(int op, ASTree oprand1) { 48 return new Expr(op, oprand1); 49 } 50 51 public int getOperator() { return operatorId; } 52 53 public void setOperator(int op) { operatorId = op; } 54 55 public ASTree oprand1() { return getLeft(); } 56 57 public void setOprand1(ASTree expr) { 58 setLeft(expr); 59 } 60 61 public ASTree oprand2() { return getRight().getLeft(); } 62 63 public void setOprand2(ASTree expr) { 64 getRight().setLeft(expr); 65 } 66 67 public void accept(Visitor v) throws CompileError { v.atExpr(this); } 68 69 public String getName() { 70 int id = operatorId; 71 if (id < 128) 72 return String.valueOf((char)id); 73 else if (NEQ <= id && id <= ARSHIFT_E) 74 return opNames[id - NEQ]; 75 else if (id == INSTANCEOF) 76 return "instanceof"; 77 else 78 return String.valueOf(id); 79 } 80 81 protected String getTag() { 82 return "op:" + getName(); 83 } 84 } 85
