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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.Tree
{
/** <summary>A node representing erroneous token range in token stream</summary> */
[System.Serializable]
public class CommonErrorNode : CommonTree
{
public IIntStream input;
public IToken start;
public IToken stop;
public RecognitionException trappedException;
public CommonErrorNode( ITokenStream input, IToken start, IToken stop,
RecognitionException e )
{
//System.out.println("start: "+start+", stop: "+stop);
if ( stop == null ||
( stop.TokenIndex < start.TokenIndex &&
stop.Type != TokenTypes.EndOfFile ) )
{
// sometimes resync does not consume a token (when LT(1) is
// in follow set. So, stop will be 1 to left to start. adjust.
// Also handle case where start is the first token and no token
// is consumed during recovery; LT(-1) will return null.
stop = start;
}
this.input = input;
this.start = start;
this.stop = stop;
this.trappedException = e;
}
#region Properties
public override bool IsNil
{
get
{
return false;
}
}
public override string Text
{
get
{
string badText = null;
if ( start is IToken )
{
int i = ( (IToken)start ).TokenIndex;
int j = ( (IToken)stop ).TokenIndex;
if ( ( (IToken)stop ).Type == TokenTypes.EndOfFile )
{
j = ( (ITokenStream)input ).Count;
}
badText = ( (ITokenStream)input ).ToString( i, j );
}
else if ( start is ITree )
{
badText = ( (ITreeNodeStream)input ).ToString( start, stop );
}
else
{
// people should subclass if they alter the tree type so this
// next one is for sure correct.
badText = "<unknown>";
}
return badText;
}
set
{
}
}
public override int Type
{
get
{
return TokenTypes.Invalid;
}
set
{
}
}
#endregion
public override string ToString()
{
if ( trappedException is MissingTokenException )
{
return "<missing type: " +
( (MissingTokenException)trappedException ).MissingType +
">";
}
else if ( trappedException is UnwantedTokenException )
{
return "<extraneous: " +
( (UnwantedTokenException)trappedException ).UnexpectedToken +
", resync=" + Text + ">";
}
else if ( trappedException is MismatchedTokenException )
{
return "<mismatched token: " + trappedException.Token + ", resync=" + Text + ">";
}
else if ( trappedException is NoViableAltException )
{
return "<unexpected: " + trappedException.Token +
", resync=" + Text + ">";
}
return "<error: " + Text + ">";
}
}
}
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