1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2005-2008 Terence Parr
4 * All rights reserved.
5 *
6 * Conversion to C#:
7 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33namespace Antlr.Runtime.Tree
34{
35    using IList = System.Collections.IList;
36    using NotSupportedException = System.NotSupportedException;
37
38    /** <summary>
39     *  Queues up nodes matched on left side of -> in a tree parser. This is
40     *  the analog of RewriteRuleTokenStream for normal parsers.
41     *  </summary>
42     */
43    [System.Serializable]
44    public class RewriteRuleNodeStream : RewriteRuleElementStream
45    {
46
47        public RewriteRuleNodeStream( ITreeAdaptor adaptor, string elementDescription )
48            : base( adaptor, elementDescription )
49        {
50        }
51
52        /** <summary>Create a stream with one element</summary> */
53        public RewriteRuleNodeStream( ITreeAdaptor adaptor, string elementDescription, object oneElement )
54            : base( adaptor, elementDescription, oneElement )
55        {
56        }
57
58        /** <summary>Create a stream, but feed off an existing list</summary> */
59        public RewriteRuleNodeStream( ITreeAdaptor adaptor, string elementDescription, IList elements )
60            : base( adaptor, elementDescription, elements )
61        {
62        }
63
64        public virtual object NextNode()
65        {
66            return NextCore();
67        }
68
69        protected override object ToTree( object el )
70        {
71            return adaptor.DupNode( el );
72        }
73
74        protected override object Dup( object el )
75        {
76            // we dup every node, so don't have to worry about calling dup; short-
77            // circuited next() so it doesn't call.
78            throw new NotSupportedException( "dup can't be called for a node stream." );
79        }
80    }
81}
82