/*
 * Copyright © 2011, Petro Protsyk, Denys Vuika
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;

namespace Scripting.SSharp.Runtime.Operators
{
  /// <summary>
  /// Implementation of is operator
  /// </summary>
  public sealed class IsOperator : IOperator
  {
    #region IOperator Members

    public string Name
    {
      get { return "is"; }
    }

    public bool Unary
    {
      get { return false; }
    }

    public object Evaluate(object value)
    {
      throw new NotImplementedException();
    }

    public object Evaluate(object left, object right)
    {
      if (!(right is Type)) throw new ArgumentException("must be Type");

      var t1 = left.GetType();
      var t2 = (Type)right;

      return t1.IsSubclassOf(t2) || t1 == t2;
    }
    #endregion
  }
}