/* * [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 { /** A node representing erroneous token range in token stream */ [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 = ""; } return badText; } set { } } public override int Type { get { return TokenTypes.Invalid; } set { } } #endregion public override string ToString() { if ( trappedException is MissingTokenException ) { return ""; } else if ( trappedException is UnwantedTokenException ) { return ""; } else if ( trappedException is MismatchedTokenException ) { return ""; } else if ( trappedException is NoViableAltException ) { return ""; } return ""; } } }