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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     [System.Serializable]
     39     public class RewriteRuleTokenStream : RewriteRuleElementStream
     40     {
     41 
     42         public RewriteRuleTokenStream( ITreeAdaptor adaptor, string elementDescription )
     43             : base( adaptor, elementDescription )
     44         {
     45         }
     46 
     47         /** <summary>Create a stream with one element</summary> */
     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> */
     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> */
     60         public virtual object NextNode()
     61         {
     62             IToken t = (IToken)NextCore();
     63             return adaptor.Create( t );
     64         }
     65 
     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          */
     76         protected override object ToTree( object el )
     77         {
     78             return el;
     79         }
     80 
     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