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 
33 namespace Antlr.Runtime.Tree
34 {
35     using IList = System.Collections.IList;
36     using NotSupportedException = System.NotSupportedException;
37 
38     [System.Serializable]
39     public class RewriteRuleTokenStream : RewriteRuleElementStream
40     {
41 
RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription )42         public RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription )
43             : base( adaptor, elementDescription )
44         {
45         }
46 
47         /** <summary>Create a stream with one element</summary> */
RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription, object oneElement )48         public RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription, object oneElement )
49             : base( adaptor, elementDescription, oneElement )
50         {
51         }
52 
53         /** <summary>Create a stream, but feed off an existing list</summary> */
RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription, IList elements )54         public RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription, IList elements )
55             : base( adaptor, elementDescription, elements )
56         {
57         }
58 
59         /** <summary>Get next token from stream and make a node for it</summary> */
NextNode()60         public virtual object NextNode()
61         {
62             IToken t = (IToken)NextCore();
63             return adaptor.Create( t );
64         }
65 
NextToken()66         public virtual IToken NextToken()
67         {
68             return (IToken)NextCore();
69         }
70 
71         /** <summary>
72          *  Don't convert to a tree unless they explicitly call nextTree.
73          *  This way we can do hetero tree nodes in rewrite.
74          *  </summary>
75          */
ToTree( object el )76         protected override object ToTree( object el )
77         {
78             return el;
79         }
80 
Dup( object el )81         protected override object Dup( object el )
82         {
83             throw new NotSupportedException( "dup can't be called for a token stream." );
84         }
85     }
86 }
87