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/*
* [The "BSD license"]
* Copyright (c) 2011 Terence Parr
* All rights reserved.
*
* Conversion to C#:
* Copyright (c) 2011 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.Misc
{
using System.Collections.Generic;
using InvalidOperationException = System.InvalidOperationException;
public class ListStack<T> : List<T>
{
public T Peek()
{
return Peek(0);
}
public T Peek(int depth)
{
T item;
if (!TryPeek(depth, out item))
throw new InvalidOperationException();
return item;
}
public bool TryPeek(out T item)
{
return TryPeek(0, out item);
}
public bool TryPeek(int depth, out T item)
{
if (depth >= Count)
{
item = default(T);
return false;
}
item = this[Count - depth - 1];
return true;
}
public T Pop()
{
T result;
if (!TryPop(out result))
throw new InvalidOperationException();
return result;
}
public bool TryPop(out T item)
{
if (Count == 0)
{
item = default(T);
return false;
}
item = this[Count - 1];
RemoveAt(Count - 1);
return true;
}
public void Push(T item)
{
Add(item);
}
}
}
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