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/*
* [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 );
}
}
}
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