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/* ****************************************************************************
*
* 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.
*
*
* ***************************************************************************/
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Dynamic.Utils;
using System.Reflection;
#if !FEATURE_CORE_DLR
namespace Microsoft.Scripting.Ast {
#else
namespace System.Linq.Expressions {
#endif
/// <summary>
/// Represents an expression that applies a delegate or lambda expression to a list of argument expressions.
/// </summary>
[DebuggerTypeProxy(typeof(Expression.InvocationExpressionProxy))]
public sealed class InvocationExpression : Expression, IArgumentProvider {
private IList<Expression> _arguments;
private readonly Expression _lambda;
private readonly Type _returnType;
internal InvocationExpression(Expression lambda, IList<Expression> arguments, Type returnType) {
_lambda = lambda;
_arguments = arguments;
_returnType = returnType;
}
/// <summary>
/// Gets the static type of the expression that this <see cref="Expression" /> represents.
/// </summary>
/// <returns>The <see cref="Type"/> that represents the static type of the expression.</returns>
public sealed override Type Type {
get { return _returnType; }
}
/// <summary>
/// Returns the node type of this Expression. Extension nodes should return
/// ExpressionType.Extension when overriding this method.
/// </summary>
/// <returns>The <see cref="ExpressionType"/> of the expression.</returns>
public sealed override ExpressionType NodeType {
get { return ExpressionType.Invoke; }
}
/// <summary>
/// Gets the delegate or lambda expression to be applied.
/// </summary>
public Expression Expression {
get { return _lambda; }
}
/// <summary>
/// Gets the arguments that the delegate or lambda expression is applied to.
/// </summary>
public ReadOnlyCollection<Expression> Arguments {
get { return ReturnReadOnly(ref _arguments); }
}
/// <summary>
/// Creates a new expression that is like this one, but using the
/// supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="expression">The <see cref="Expression" /> property of the result.</param>
/// <param name="arguments">The <see cref="Arguments" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public InvocationExpression Update(Expression expression, IEnumerable<Expression> arguments) {
if (expression == Expression && arguments == Arguments) {
return this;
}
return Expression.Invoke(expression, arguments);
}
Expression IArgumentProvider.GetArgument(int index) {
return _arguments[index];
}
int IArgumentProvider.ArgumentCount {
get {
return _arguments.Count;
}
}
/// <summary>
/// Dispatches to the specific visit method for this node type.
/// </summary>
protected internal override Expression Accept(ExpressionVisitor visitor) {
return visitor.VisitInvocation(this);
}
internal InvocationExpression Rewrite(Expression lambda, Expression[] arguments) {
Debug.Assert(lambda != null);
Debug.Assert(arguments == null || arguments.Length == _arguments.Count);
return Expression.Invoke(lambda, arguments ?? _arguments);
}
internal LambdaExpression LambdaOperand {
get {
return (_lambda.NodeType == ExpressionType.Quote)
? (LambdaExpression)((UnaryExpression)_lambda).Operand
: (_lambda as LambdaExpression);
}
}
}
public partial class Expression {
///<summary>
///Creates an <see cref="T:System.Linq.Expressions.InvocationExpression" /> that
///applies a delegate or lambda expression to a list of argument expressions.
///</summary>
///<returns>
///An <see cref="T:System.Linq.Expressions.InvocationExpression" /> that
///applies the specified delegate or lambda expression to the provided arguments.
///</returns>
///<param name="expression">
///An <see cref="T:System.Linq.Expressions.Expression" /> that represents the delegate
///or lambda expression to be applied.
///</param>
///<param name="arguments">
///An array of <see cref="T:System.Linq.Expressions.Expression" /> objects
///that represent the arguments that the delegate or lambda expression is applied to.
///</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="expression" />.Type does not represent a delegate type or an <see cref="T:System.Linq.Expressions.Expression`1" />.-or-The <see cref="P:System.Linq.Expressions.Expression.Type" /> property of an element of <paramref name="arguments" /> is not assignable to the type of the corresponding parameter of the delegate represented by <paramref name="expression" />.</exception>
///<exception cref="T:System.InvalidOperationException">
///<paramref name="arguments" /> does not contain the same number of elements as the list of parameters for the delegate represented by <paramref name="expression" />.</exception>
public static InvocationExpression Invoke(Expression expression, params Expression[] arguments) {
return Invoke(expression, (IEnumerable<Expression>)arguments);
}
///<summary>
///Creates an <see cref="T:System.Linq.Expressions.InvocationExpression" /> that
///applies a delegate or lambda expression to a list of argument expressions.
///</summary>
///<returns>
///An <see cref="T:System.Linq.Expressions.InvocationExpression" /> that
///applies the specified delegate or lambda expression to the provided arguments.
///</returns>
///<param name="expression">
///An <see cref="T:System.Linq.Expressions.Expression" /> that represents the delegate
///or lambda expression to be applied.
///</param>
///<param name="arguments">
///An <see cref="T:System.Collections.Generic.IEnumerable`1" /> of <see cref="T:System.Linq.Expressions.Expression" /> objects
///that represent the arguments that the delegate or lambda expression is applied to.
///</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="expression" />.Type does not represent a delegate type or an <see cref="T:System.Linq.Expressions.Expression`1" />.-or-The <see cref="P:System.Linq.Expressions.Expression.Type" /> property of an element of <paramref name="arguments" /> is not assignable to the type of the corresponding parameter of the delegate represented by <paramref name="expression" />.</exception>
///<exception cref="T:System.InvalidOperationException">
///<paramref name="arguments" /> does not contain the same number of elements as the list of parameters for the delegate represented by <paramref name="expression" />.</exception>
public static InvocationExpression Invoke(Expression expression, IEnumerable<Expression> arguments) {
RequiresCanRead(expression, "expression");
var args = arguments.ToReadOnly();
var mi = GetInvokeMethod(expression);
ValidateArgumentTypes(mi, ExpressionType.Invoke, ref args);
return new InvocationExpression(expression, args, mi.ReturnType);
}
/// <summary>
/// Gets the delegate's Invoke method; used by InvocationExpression.
/// </summary>
/// <param name="expression">The expression to be invoked.</param>
internal static MethodInfo GetInvokeMethod(Expression expression) {
Type delegateType = expression.Type;
if (!expression.Type.IsSubclassOf(typeof(MulticastDelegate))) {
Type exprType = TypeUtils.FindGenericType(typeof(Expression<>), expression.Type);
if (exprType == null) {
throw Error.ExpressionTypeNotInvocable(expression.Type);
}
delegateType = exprType.GetGenericArguments()[0];
}
return delegateType.GetMethod("Invoke");
}
}
}
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