/IronPython_Main/Runtime/Microsoft.Scripting.Core/Actions/UnaryOperationBinder.cs
C# | 129 lines | 63 code | 18 blank | 48 comment | 4 complexity | 4dbb2b3bb84faea8f98e1fa15fac605e MD5 | raw file
Possible License(s): GPL-2.0, MPL-2.0-no-copyleft-exception, CPL-1.0, CC-BY-SA-3.0, BSD-3-Clause, ISC, AGPL-3.0, LGPL-2.1, Apache-2.0
- /* ****************************************************************************
- *
- * Copyright (c) Microsoft Corporation.
- *
- * This source code is subject to terms and conditions of the Apache License, Version 2.0. A
- * copy of the license can be found in the License.html file at the root of this distribution. If
- * you cannot locate the Apache License, Version 2.0, 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 Apache License, Version 2.0.
- *
- * You must not remove this notice, or any other, from this software.
- *
- *
- * ***************************************************************************/
-
- #if CLR2
- using Microsoft.Scripting.Ast;
- #else
- using System.Linq.Expressions;
- #endif
-
- using System.Dynamic.Utils;
-
- namespace System.Dynamic {
- /// <summary>
- /// Represents the unary dynamic operation at the call site, providing the binding semantic and the details about the operation.
- /// </summary>
- public abstract class UnaryOperationBinder : DynamicMetaObjectBinder {
- private ExpressionType _operation;
-
- /// <summary>
- /// Initializes a new instance of the <see cref="BinaryOperationBinder"/> class.
- /// </summary>
- /// <param name="operation">The unary operation kind.</param>
- protected UnaryOperationBinder(ExpressionType operation) {
- ContractUtils.Requires(OperationIsValid(operation), "operation");
- _operation = operation;
- }
-
- /// <summary>
- /// The result type of the operation.
- /// </summary>
- public override sealed Type ReturnType {
- get {
- switch(_operation) {
- case ExpressionType.IsFalse:
- case ExpressionType.IsTrue:
- return typeof(bool);
- default:
- return typeof(object);
- }
- }
- }
-
- /// <summary>
- /// The unary operation kind.
- /// </summary>
- public ExpressionType Operation {
- get {
- return _operation;
- }
- }
-
- /// <summary>
- /// Performs the binding of the unary dynamic operation if the target dynamic object cannot bind.
- /// </summary>
- /// <param name="target">The target of the dynamic unary operation.</param>
- /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
- public DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target) {
- return FallbackUnaryOperation(target, null);
- }
-
- /// <summary>
- /// Performs the binding of the unary dynamic operation if the target dynamic object cannot bind.
- /// </summary>
- /// <param name="target">The target of the dynamic unary operation.</param>
- /// <param name="errorSuggestion">The binding result in case the binding fails, or null.</param>
- /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
- public abstract DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target, DynamicMetaObject errorSuggestion);
-
- /// <summary>
- /// Performs the binding of the dynamic unary operation.
- /// </summary>
- /// <param name="target">The target of the dynamic operation.</param>
- /// <param name="args">An array of arguments of the dynamic operation.</param>
- /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
- 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;
- }
- }
- }
- }