forked from jasder/antlr
98 lines
3.9 KiB
C#
98 lines
3.9 KiB
C#
/*
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* [The "BSD license"]
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* Copyright (c) 2013 Terence Parr
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* Copyright (c) 2013 Sam Harwell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using Antlr4.Runtime;
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using Antlr4.Runtime.Atn;
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using Antlr4.Runtime.Misc;
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using Sharpen;
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namespace Antlr4.Runtime
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{
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/// <summary>
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/// Indicates that the parser could not decide which of two or more paths
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/// to take based upon the remaining input.
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/// </summary>
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/// <remarks>
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/// Indicates that the parser could not decide which of two or more paths
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/// to take based upon the remaining input. It tracks the starting token
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/// of the offending input and also knows where the parser was
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/// in the various paths when the error. Reported by reportNoViableAlternative()
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/// </remarks>
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[System.Serializable]
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public class NoViableAltException : RecognitionException
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{
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private const long serialVersionUID = 5096000008992867052L;
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/// <summary>Which configurations did we try at input.index() that couldn't match input.LT(1)?
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/// </summary>
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[Nullable]
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private readonly ATNConfigSet deadEndConfigs;
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/// <summary>
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/// The token object at the start index; the input stream might
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/// not be buffering tokens so get a reference to it.
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/// </summary>
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/// <remarks>
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/// The token object at the start index; the input stream might
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/// not be buffering tokens so get a reference to it. (At the
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/// time the error occurred, of course the stream needs to keep a
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/// buffer all of the tokens but later we might not have access to those.)
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/// </remarks>
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[NotNull]
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private readonly IToken startToken;
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public NoViableAltException(Parser recognizer) : this(recognizer, ((ITokenStream)
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recognizer.InputStream), recognizer.CurrentToken, recognizer.CurrentToken, null
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, recognizer._ctx)
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{
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}
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public NoViableAltException(Recognizer<IToken, object> recognizer, ITokenStream input
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, IToken startToken, IToken offendingToken, ATNConfigSet deadEndConfigs, ParserRuleContext
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ctx) : base(recognizer, input, ctx)
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{
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// LL(1) error
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this.deadEndConfigs = deadEndConfigs;
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this.startToken = startToken;
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this.OffendingToken = offendingToken;
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}
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public virtual IToken GetStartToken()
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{
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return startToken;
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}
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[Nullable]
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public virtual ATNConfigSet GetDeadEndConfigs()
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{
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return deadEndConfigs;
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}
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}
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}
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