01: /*
02: * hgcommons 7
03: * Hammurapi Group Common Library
04: * Copyright (C) 2003 Hammurapi Group
05: *
06: * This program is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: *
20: * URL: http://www.hammurapi.biz/hammurapi-biz/ef/xmenu/hammurapi-group/products/products/hgcommons/index.html
21: * e-Mail: support@hammurapi.biz
22: */
23: package biz.hammurapi.antlr;
24:
25: import antlr.collections.AST;
26: import biz.hammurapi.util.PoliteVisitor;
27: import biz.hammurapi.util.Visitable;
28: import biz.hammurapi.util.Visitor;
29:
30: /**
31: * Navigates Visitor through DOM tree.
32: * @author Pavel Vlasov
33: * @version $Revision: 1.2 $
34: */
35: public class AstVisitable implements Visitable {
36: private AST node;
37: private boolean withSiblings;
38:
39: public boolean accept(Visitor visitor) {
40: if (withSiblings) {
41: for (AST ast = node; ast != null; ast = ast
42: .getNextSibling()) {
43: accept(ast, visitor);
44: }
45: return true;
46: }
47:
48: return accept(node, visitor);
49: }
50:
51: /**
52: * @param node
53: * @param visitor
54: */
55: private boolean accept(AST node, Visitor visitor) {
56: if (visitor.visit(node)) {
57: for (AST child = node.getFirstChild(); child != null; child = child
58: .getNextSibling()) {
59: accept(child, visitor);
60: }
61: if (visitor instanceof PoliteVisitor) {
62: ((PoliteVisitor) visitor).leave(node);
63: }
64: return true;
65: }
66:
67: return false;
68: }
69:
70: /**
71: * @param node
72: */
73: public AstVisitable(AST node, boolean withSiblings) {
74: super();
75: this.node = node;
76: this.withSiblings = withSiblings;
77: }
78: }
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