| /* |
| * [The "BSD licence"] |
| * Copyright (c) 2005-2008 Terence Parr |
| * All rights reserved. |
| * |
| * Conversion to C#: |
| * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| namespace Antlr.Runtime.Debug |
| { |
| |
| public class DebugTokenStream : ITokenStream |
| { |
| protected IDebugEventListener dbg; |
| public ITokenStream input; |
| protected bool initialStreamState = true; |
| |
| /** <summary>Track the last mark() call result value for use in rewind().</summary> */ |
| protected int lastMarker; |
| |
| public DebugTokenStream( ITokenStream input, IDebugEventListener dbg ) |
| { |
| this.input = input; |
| DebugListener = dbg; |
| // force TokenStream to get at least first valid token |
| // so we know if there are any hidden tokens first in the stream |
| input.LT( 1 ); |
| } |
| |
| #region Properties |
| |
| public virtual int Index |
| { |
| get |
| { |
| return input.Index; |
| } |
| } |
| |
| public virtual int Range |
| { |
| get |
| { |
| return input.Range; |
| } |
| } |
| |
| public virtual IDebugEventListener DebugListener |
| { |
| get |
| { |
| return dbg; |
| } |
| set |
| { |
| dbg = value; |
| } |
| } |
| |
| #endregion |
| |
| public virtual void Consume() |
| { |
| if ( initialStreamState ) |
| { |
| ConsumeInitialHiddenTokens(); |
| } |
| int a = input.Index; |
| IToken t = input.LT( 1 ); |
| input.Consume(); |
| int b = input.Index; |
| dbg.ConsumeToken( t ); |
| if ( b > a + 1 ) |
| { |
| // then we consumed more than one token; must be off channel tokens |
| for ( int i = a + 1; i < b; i++ ) |
| { |
| dbg.ConsumeHiddenToken( input.Get( i ) ); |
| } |
| } |
| } |
| |
| /** <summary>Consume all initial off-channel tokens</summary> */ |
| protected virtual void ConsumeInitialHiddenTokens() |
| { |
| int firstOnChannelTokenIndex = input.Index; |
| for ( int i = 0; i < firstOnChannelTokenIndex; i++ ) |
| { |
| dbg.ConsumeHiddenToken( input.Get( i ) ); |
| } |
| initialStreamState = false; |
| } |
| |
| public virtual IToken LT( int i ) |
| { |
| if ( initialStreamState ) |
| { |
| ConsumeInitialHiddenTokens(); |
| } |
| dbg.LT( i, input.LT( i ) ); |
| return input.LT( i ); |
| } |
| |
| public virtual int LA( int i ) |
| { |
| if ( initialStreamState ) |
| { |
| ConsumeInitialHiddenTokens(); |
| } |
| dbg.LT( i, input.LT( i ) ); |
| return input.LA( i ); |
| } |
| |
| public virtual IToken Get( int i ) |
| { |
| return input.Get( i ); |
| } |
| |
| public virtual int Mark() |
| { |
| lastMarker = input.Mark(); |
| dbg.Mark( lastMarker ); |
| return lastMarker; |
| } |
| |
| public virtual void Rewind( int marker ) |
| { |
| dbg.Rewind( marker ); |
| input.Rewind( marker ); |
| } |
| |
| public virtual void Rewind() |
| { |
| dbg.Rewind(); |
| input.Rewind( lastMarker ); |
| } |
| |
| public virtual void Release( int marker ) |
| { |
| } |
| |
| public virtual void Seek( int index ) |
| { |
| // TODO: implement seek in dbg interface |
| // db.seek(index); |
| input.Seek( index ); |
| } |
| |
| public virtual int Count |
| { |
| get |
| { |
| return input.Count; |
| } |
| } |
| |
| public virtual ITokenSource TokenSource |
| { |
| get |
| { |
| return input.TokenSource; |
| } |
| } |
| |
| public virtual string SourceName |
| { |
| get |
| { |
| return TokenSource.SourceName; |
| } |
| } |
| |
| public override string ToString() |
| { |
| return input.ToString(); |
| } |
| |
| public virtual string ToString( int start, int stop ) |
| { |
| return input.ToString( start, stop ); |
| } |
| |
| public virtual string ToString( IToken start, IToken stop ) |
| { |
| return input.ToString( start, stop ); |
| } |
| } |
| } |