01: /*
02: * $Id: XorNode.java,v 1.5 2002/09/16 08:05:05 jkl Exp $
03: *
04: * Copyright (c) 2002 Njet Communications Ltd. All Rights Reserved.
05: *
06: * Use is subject to license terms, as defined in
07: * Anvil Sofware License, Version 1.1. See LICENSE
08: * file, or http://njet.org/license-1.1.txt
09: */
10: package anvil.script.expression;
11:
12: import anvil.core.Any;
13: import anvil.codec.Code;
14: import anvil.codec.ConstantPool;
15: import anvil.codec.Source;
16: import anvil.script.compiler.ByteCompiler;
17: import anvil.script.Context;
18: import java.io.IOException;
19:
20: /**
21: * class XorNode
22: *
23: * @author: Jani Lehtimäki
24: */
25: public class XorNode extends BinaryParent {
26:
27: public XorNode(Node left, Node right) {
28: super (left, right);
29: }
30:
31: public int typeOf() {
32: return Node.EXPR_XOR;
33: }
34:
35: public Any eval() {
36: boolean a = _left.eval().toBoolean();
37: boolean b = _right.eval().toBoolean();
38: return a != b ? Any.TRUE : Any.FALSE;
39: }
40:
41: public void compile(ByteCompiler context, int operation) {
42: super .compile(context, GET_BOOLEAN);
43: Code code = context.getCode();
44: ConstantPool pool = code.getPool();
45: Source notequal = code.if_icmpne();
46: if (operation == GET_BOOLEAN) {
47: code.iconst(false);
48: } else {
49: code.getstatic(pool.addFieldRef(context.TYPE_ANY, "FALSE",
50: "Lanvil/core/Any;"));
51: }
52: Source toend = code.go_to();
53: notequal.bind();
54: if (operation == GET_BOOLEAN) {
55: code.iconst(true);
56: } else {
57: code.getstatic(pool.addFieldRef(context.TYPE_ANY, "TRUE",
58: "Lanvil/core/Any;"));
59: }
60: toend.bind();
61: }
62:
63: }
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