#region license
//
//	(C) 2007 - 2008 Novell, Inc. http://www.novell.com
//	(C) 2007 - 2008 Jb Evain http://evain.net
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#endregion
using Mono.Cecil;
using Telerik.JustDecompiler.Ast.Statements;
using Telerik.JustDecompiler.Decompiler;
using Telerik.JustDecompiler.Ast.Expressions;

namespace Telerik.JustDecompiler.Steps
{
	public class RemoveLastReturn : IDecompilationStep
	{
		public BlockStatement Process (DecompilationContext context, BlockStatement block)
		{
            if (block.Statements.Count > 0)
            {
                int index = block.Statements.Count - 1;
                ExpressionStatement retExprHolder = block.Statements[index] as ExpressionStatement;
                if (retExprHolder == null)
                {
                    return block;
                }
                if (retExprHolder.Expression is ReturnExpression)
                {
                    if ((retExprHolder.Expression as ReturnExpression).Value == null && string.IsNullOrEmpty(retExprHolder.Label))
                    {
                        block.Statements.RemoveAt(index);
                    }
                }
                return block;
            }

            return block;
		}
	}
}
