/* ****************************************************************************
*
* 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;
using System.Runtime.CompilerServices;
#if !FEATURE_CORE_DLR
namespace Microsoft.Scripting.Ast {
#else
namespace System.Linq.Expressions {
#endif
///
/// Represents a constructor call that has a collection initializer.
///
///
/// Use the factory methods to create a ListInitExpression.
/// The value of the NodeType property of a ListInitExpression is ListInit.
///
[DebuggerTypeProxy(typeof(Expression.ListInitExpressionProxy))]
public sealed class ListInitExpression : Expression {
private readonly NewExpression _newExpression;
private readonly ReadOnlyCollection _initializers;
internal ListInitExpression(NewExpression newExpression, ReadOnlyCollection initializers) {
_newExpression = newExpression;
_initializers = initializers;
}
///
/// Returns the node type of this . (Inherited from .)
///
/// The that represents this expression.
public sealed override ExpressionType NodeType {
get { return ExpressionType.ListInit; }
}
///
/// Gets the static type of the expression that this represents. (Inherited from .)
///
/// The that represents the static type of the expression.
public sealed override Type Type {
get { return _newExpression.Type; }
}
///
/// Gets a value that indicates whether the expression tree node can be reduced.
///
public override bool CanReduce {
get {
return true;
}
}
///
/// Gets the expression that contains a call to the constructor of a collection type.
///
public NewExpression NewExpression {
get { return _newExpression; }
}
///
/// Gets the element initializers that are used to initialize a collection.
///
public ReadOnlyCollection Initializers {
get { return _initializers; }
}
///
/// Dispatches to the specific visit method for this node type.
///
protected internal override Expression Accept(ExpressionVisitor visitor) {
return visitor.VisitListInit(this);
}
///
/// Reduces the binary expression node to a simpler expression.
/// If CanReduce returns true, this should return a valid expression.
/// This method is allowed to return another node which itself
/// must be reduced.
///
/// The reduced expression.
public override Expression Reduce() {
return MemberInitExpression.ReduceListInit(_newExpression, _initializers, true);
}
///
/// 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.
///
/// The property of the result.
/// The property of the result.
/// This expression if no children changed, or an expression with the updated children.
public ListInitExpression Update(NewExpression newExpression, IEnumerable initializers) {
if (newExpression == NewExpression && initializers == Initializers) {
return this;
}
return Expression.ListInit(newExpression, initializers);
}
}
public partial class Expression {
///
/// Creates a that uses a method named "Add" to add elements to a collection.
///
/// A to set the property equal to.
/// An array of objects to use to populate the collection.
/// A that has the property equal to ListInit and the property set to the specified value.
public static ListInitExpression ListInit(NewExpression newExpression, params Expression[] initializers) {
ContractUtils.RequiresNotNull(newExpression, "newExpression");
ContractUtils.RequiresNotNull(initializers, "initializers");
return ListInit(newExpression, initializers as IEnumerable);
}
///
/// Creates a that uses a method named "Add" to add elements to a collection.
///
/// A to set the property equal to.
/// An that contains objects to use to populate the collection.
/// A that has the property equal to ListInit and the property set to the specified value.
public static ListInitExpression ListInit(NewExpression newExpression, IEnumerable initializers) {
ContractUtils.RequiresNotNull(newExpression, "newExpression");
ContractUtils.RequiresNotNull(initializers, "initializers");
var initializerlist = initializers.ToReadOnly();
if (initializerlist.Count == 0) {
throw Error.ListInitializerWithZeroMembers();
}
MethodInfo addMethod = FindMethod(newExpression.Type, "Add", null, new Expression[] { initializerlist[0] }, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
return ListInit(newExpression, addMethod, initializers);
}
///
/// Creates a that uses a specified method to add elements to a collection.
///
/// A to set the property equal to.
/// A that represents an instance method named "Add" (case insensitive), that adds an element to a collection.
/// An array of objects to use to populate the collection.
/// A that has the property equal to ListInit and the property set to the specified value.
public static ListInitExpression ListInit(NewExpression newExpression, MethodInfo addMethod, params Expression[] initializers) {
if (addMethod == null) {
return ListInit(newExpression, initializers as IEnumerable);
}
ContractUtils.RequiresNotNull(newExpression, "newExpression");
ContractUtils.RequiresNotNull(initializers, "initializers");
return ListInit(newExpression, addMethod, initializers as IEnumerable);
}
///
/// Creates a that uses a specified method to add elements to a collection.
///
/// A to set the property equal to.
/// A that represents an instance method named "Add" (case insensitive), that adds an element to a collection.
/// An that contains objects to use to populate the Initializers collection.
/// A that has the property equal to ListInit and the property set to the specified value.
public static ListInitExpression ListInit(NewExpression newExpression, MethodInfo addMethod, IEnumerable initializers) {
if (addMethod == null) {
return ListInit(newExpression, initializers);
}
ContractUtils.RequiresNotNull(newExpression, "newExpression");
ContractUtils.RequiresNotNull(initializers, "initializers");
var initializerlist = initializers.ToReadOnly();
if (initializerlist.Count == 0) {
throw Error.ListInitializerWithZeroMembers();
}
ElementInit[] initList = new ElementInit[initializerlist.Count];
for (int i = 0; i < initializerlist.Count; i++) {
initList[i] = ElementInit(addMethod, initializerlist[i]);
}
return ListInit(newExpression, new TrueReadOnlyCollection(initList));
}
///
/// Creates a that uses specified objects to initialize a collection.
///
/// A to set the property equal to.
/// An array that contains objects to use to populate the collection.
///
/// A that has the property equal to ListInit
/// and the and properties set to the specified values.
///
///
/// The property of must represent a type that implements .
/// The property of the resulting is equal to newExpression.Type.
///
public static ListInitExpression ListInit(NewExpression newExpression, params ElementInit[] initializers) {
return ListInit(newExpression, (IEnumerable)initializers);
}
///
/// Creates a that uses specified objects to initialize a collection.
///
/// A to set the property equal to.
/// An that contains objects to use to populate the collection.
/// An that contains objects to use to populate the collection.
///
/// The property of must represent a type that implements .
/// The property of the resulting is equal to newExpression.Type.
///
public static ListInitExpression ListInit(NewExpression newExpression, IEnumerable initializers) {
ContractUtils.RequiresNotNull(newExpression, "newExpression");
ContractUtils.RequiresNotNull(initializers, "initializers");
var initializerlist = initializers.ToReadOnly();
if (initializerlist.Count == 0) {
throw Error.ListInitializerWithZeroMembers();
}
ValidateListInitArgs(newExpression.Type, initializerlist);
return new ListInitExpression(newExpression, initializerlist);
}
}
}