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      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     /** <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