UnaryOperationBinder.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Actions / UnaryOperationBinder.cs / 1305376 / UnaryOperationBinder.cs
                        

                        
                            /* **************************************************************************** 
 *
 * Copyright (c) Microsoft Corporation.
 *
 * This source code is subject to terms and conditions of the Microsoft Public License. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If
 * you cannot locate the  Microsoft Public License, please send an email to 
 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
 * by the terms of the Microsoft Public License.
 * 
 * You must not remove this notice, or any other, from this software.
 *
 *
 * ***************************************************************************/ 

using System.Dynamic.Utils; 
using System.Linq.Expressions; 

namespace System.Dynamic { 
    /// 
    /// Represents the unary dynamic operation at the call site, providing the binding semantic and the details about the operation.
    /// 
    public abstract class UnaryOperationBinder : DynamicMetaObjectBinder { 
        private ExpressionType _operation;
 
        ///  
        /// Initializes a new instance of the  class.
        ///  
        /// The unary operation kind.
        protected UnaryOperationBinder(ExpressionType operation) {
            ContractUtils.Requires(OperationIsValid(operation), "operation");
            _operation = operation; 
        }
 
        ///  
        /// The result type of the operation.
        ///  
        public override sealed Type ReturnType {
            get {
                switch(_operation) {
                    case ExpressionType.IsFalse: 
                    case ExpressionType.IsTrue:
                        return typeof(bool); 
                    default: 
                        return typeof(object);
                } 
            }
        }

        ///  
        /// The unary operation kind.
        ///  
        public ExpressionType Operation { 
            get {
                return _operation; 
            }
        }

        ///  
        /// Performs the binding of the unary dynamic operation if the target dynamic object cannot bind.
        ///  
        /// The target of the dynamic unary operation. 
        /// The  representing the result of the binding.
        public DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target) { 
            return FallbackUnaryOperation(target, null);
        }

        ///  
        /// Performs the binding of the unary dynamic operation if the target dynamic object cannot bind.
        ///  
        /// The target of the dynamic unary operation. 
        /// The binding result in case the binding fails, or null.
        /// The  representing the result of the binding. 
        public abstract DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target, DynamicMetaObject errorSuggestion);

        /// 
        /// Performs the binding of the dynamic unary operation. 
        /// 
        /// The target of the dynamic operation. 
        /// An array of arguments of the dynamic operation. 
        /// The  representing the result of the binding.
        public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) { 
            ContractUtils.RequiresNotNull(target, "target");
            ContractUtils.Requires(args == null || args.Length == 0, "args");

            return target.BindUnaryOperation(this); 
        }
 
        // this is a standard DynamicMetaObjectBinder 
        internal override sealed bool IsStandardBinder {
            get { 
                return true;
            }
        }
 
        internal static bool OperationIsValid(ExpressionType operation) {
            switch (operation) { 
                #region Generated Unary Operation Binder Validator 

                // *** BEGIN GENERATED CODE *** 
                // generated by function: gen_unop_validator from: generate_tree.py

                case ExpressionType.Negate:
                case ExpressionType.UnaryPlus: 
                case ExpressionType.Not:
                case ExpressionType.Decrement: 
                case ExpressionType.Increment: 
                case ExpressionType.OnesComplement:
                case ExpressionType.IsTrue: 
                case ExpressionType.IsFalse:

                // *** END GENERATED CODE ***
 
                #endregion
 
                case ExpressionType.Extension: 
                    return true;
 
                default:
                    return false;
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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