forked from jasder/antlr
111 lines
4.0 KiB
C#
111 lines
4.0 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>A semantic predicate failed during validation.</summary>
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/// <remarks>
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/// A semantic predicate failed during validation. Validation of predicates
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/// occurs when normally parsing the alternative just like matching a token.
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/// Disambiguating predicate evaluation occurs when we test a predicate during
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/// prediction.
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/// </remarks>
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[System.Serializable]
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public class FailedPredicateException : RecognitionException
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{
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private const long serialVersionUID = 5379330841495778709L;
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private readonly int ruleIndex;
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private readonly int predicateIndex;
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private readonly string predicate;
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public FailedPredicateException(Parser recognizer) : this(recognizer, null)
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{
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}
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public FailedPredicateException(Parser recognizer, string predicate) : this(recognizer
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, predicate, null)
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{
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}
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public FailedPredicateException(Parser recognizer, string predicate, string message
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) : base(FormatMessage(predicate, message), recognizer, ((ITokenStream)recognizer
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.InputStream), recognizer._ctx)
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{
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ATNState s = recognizer.Interpreter.atn.states[recognizer.State];
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AbstractPredicateTransition trans = (AbstractPredicateTransition)s.Transition(0);
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if (trans is PredicateTransition)
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{
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this.ruleIndex = ((PredicateTransition)trans).ruleIndex;
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this.predicateIndex = ((PredicateTransition)trans).predIndex;
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}
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else
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{
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this.ruleIndex = 0;
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this.predicateIndex = 0;
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}
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this.predicate = predicate;
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this.OffendingToken = recognizer.CurrentToken;
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}
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public virtual int GetRuleIndex()
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{
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return ruleIndex;
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}
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public virtual int GetPredIndex()
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{
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return predicateIndex;
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}
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[return: Nullable]
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public virtual string GetPredicate()
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{
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return predicate;
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}
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[return: NotNull]
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private static string FormatMessage(string predicate, string message)
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{
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if (message != null)
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{
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return message;
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}
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return string.Format("failed predicate: {{{0}}}?", predicate);
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}
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}
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}
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