forked from jasder/antlr
136 lines
3.8 KiB
C#
136 lines
3.8 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.Atn;
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using Antlr4.Runtime.Misc;
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using Sharpen;
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namespace Antlr4.Runtime.Atn
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{
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public class SingletonPredictionContext : PredictionContext
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{
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[NotNull]
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public readonly PredictionContext parent;
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public readonly int returnState;
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internal SingletonPredictionContext(PredictionContext parent, int returnState) :
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base(CalculateHashCode(CalculateParentHashCode(parent), CalculateReturnStateHashCode
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(returnState)))
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{
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System.Diagnostics.Debug.Assert(returnState != EmptyFullStateKey && returnState !=
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EmptyLocalStateKey);
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this.parent = parent;
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this.returnState = returnState;
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}
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public override PredictionContext GetParent(int index)
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{
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System.Diagnostics.Debug.Assert(index == 0);
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return parent;
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}
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public override int GetReturnState(int index)
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{
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System.Diagnostics.Debug.Assert(index == 0);
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return returnState;
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}
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public override int FindReturnState(int returnState)
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{
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return this.returnState == returnState ? 0 : -1;
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}
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public override int Size
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{
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get
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{
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return 1;
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}
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}
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public override bool IsEmpty
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{
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get
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{
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return false;
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}
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}
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public override bool HasEmpty
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{
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get
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{
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return false;
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}
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}
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public override PredictionContext AppendContext(PredictionContext suffix, PredictionContextCache
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contextCache)
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{
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return contextCache.GetChild(parent.AppendContext(suffix, contextCache), returnState
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);
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}
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protected internal override PredictionContext AddEmptyContext()
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{
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PredictionContext[] parents = new PredictionContext[] { parent, EmptyFull };
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int[] returnStates = new int[] { returnState, EmptyFullStateKey };
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return new ArrayPredictionContext(parents, returnStates);
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}
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protected internal override PredictionContext RemoveEmptyContext()
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{
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return this;
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}
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public override bool Equals(object o)
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{
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if (o == this)
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{
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return true;
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}
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else
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{
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if (!(o is Antlr4.Runtime.Atn.SingletonPredictionContext))
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{
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return false;
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}
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}
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Antlr4.Runtime.Atn.SingletonPredictionContext other = (Antlr4.Runtime.Atn.SingletonPredictionContext
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)o;
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if (this.GetHashCode() != other.GetHashCode())
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{
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return false;
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}
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return returnState == other.returnState && parent.Equals(other.parent);
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}
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}
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}
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