forked from jasder/antlr
137 lines
3.6 KiB
C#
137 lines
3.6 KiB
C#
/*
|
|
* [The "BSD license"]
|
|
* Copyright (c) 2013 Terence Parr
|
|
* Copyright (c) 2013 Sam Harwell
|
|
* 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.
|
|
*/
|
|
using System;
|
|
using Antlr4.Runtime;
|
|
using Antlr4.Runtime.Atn;
|
|
using Sharpen;
|
|
|
|
namespace Antlr4.Runtime.Atn
|
|
{
|
|
public sealed class EmptyPredictionContext : PredictionContext
|
|
{
|
|
public static readonly Antlr4.Runtime.Atn.EmptyPredictionContext LocalContext = new
|
|
Antlr4.Runtime.Atn.EmptyPredictionContext(false);
|
|
|
|
public static readonly Antlr4.Runtime.Atn.EmptyPredictionContext FullContext = new
|
|
Antlr4.Runtime.Atn.EmptyPredictionContext(true);
|
|
|
|
private readonly bool fullContext;
|
|
|
|
private EmptyPredictionContext(bool fullContext) : base(CalculateHashCode(CalculateEmptyParentHashCode
|
|
(), CalculateEmptyReturnStateHashCode()))
|
|
{
|
|
this.fullContext = fullContext;
|
|
}
|
|
|
|
public bool IsFullContext()
|
|
{
|
|
return fullContext;
|
|
}
|
|
|
|
protected internal override PredictionContext AddEmptyContext()
|
|
{
|
|
return this;
|
|
}
|
|
|
|
protected internal override PredictionContext RemoveEmptyContext()
|
|
{
|
|
throw new NotSupportedException("Cannot remove the empty context from itself.");
|
|
}
|
|
|
|
public override PredictionContext GetParent(int index)
|
|
{
|
|
throw new IndexOutOfRangeException();
|
|
}
|
|
|
|
public override int GetReturnState(int index)
|
|
{
|
|
throw new IndexOutOfRangeException();
|
|
}
|
|
|
|
public override int FindReturnState(int returnState)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
public override int Size
|
|
{
|
|
get
|
|
{
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
public override PredictionContext AppendContext(int returnContext, PredictionContextCache
|
|
contextCache)
|
|
{
|
|
return contextCache.GetChild(this, returnContext);
|
|
}
|
|
|
|
public override PredictionContext AppendContext(PredictionContext suffix, PredictionContextCache
|
|
contextCache)
|
|
{
|
|
return suffix;
|
|
}
|
|
|
|
public override bool IsEmpty
|
|
{
|
|
get
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public override bool HasEmpty
|
|
{
|
|
get
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public override bool Equals(object o)
|
|
{
|
|
return this == o;
|
|
}
|
|
|
|
public override string[] ToStrings<_T0>(Recognizer<_T0> recognizer, int currentState
|
|
)
|
|
{
|
|
return new string[] { "[]" };
|
|
}
|
|
|
|
public override string[] ToStrings<_T0>(Recognizer<_T0> recognizer, PredictionContext
|
|
stop, int currentState)
|
|
{
|
|
return new string[] { "[]" };
|
|
}
|
|
}
|
|
}
|