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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.Dynamic.Utils;
#if CLR2
namespace Microsoft.Scripting.Ast {
#else
namespace System.Linq.Expressions {
#endif
/// <summary>
/// Used to denote the target of a <see cref="GotoExpression"/>.
/// </summary>
public sealed class LabelTarget {
private readonly Type _type;
private readonly string _name;
internal LabelTarget(Type type, string name) {
_type = type;
_name = name;
}
/// <summary>
/// Gets the name of the label.
/// </summary>
/// <remarks>The label's name is provided for information purposes only.</remarks>
public string Name {
get { return _name; }
}
/// <summary>
/// The type of value that is passed when jumping to the label
/// (or System.Void if no value should be passed).
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods")]
public Type Type {
get { return _type; }
}
/// <summary>
/// Returns a <see cref="String"/> that represents the current <see cref="Object"/>.
/// </summary>
/// <returns>A <see cref="String"/> that represents the current <see cref="Object"/>. </returns>
public override string ToString() {
return String.IsNullOrEmpty(this.Name) ? "UnamedLabel" : this.Name;
}
}
public partial class Expression {
/// <summary>
/// Creates a <see cref="LabelTarget"/> representing a label with void type and no name.
/// </summary>
/// <returns>The new <see cref="LabelTarget"/>.</returns>
public static LabelTarget Label() {
return Label(typeof(void), null);
}
/// <summary>
/// Creates a <see cref="LabelTarget"/> representing a label with void type and the given name.
/// </summary>
/// <param name="name">The name of the label.</param>
/// <returns>The new <see cref="LabelTarget"/>.</returns>
public static LabelTarget Label(string name) {
return Label(typeof(void), name);
}
/// <summary>
/// Creates a <see cref="LabelTarget"/> representing a label with the given type.
/// </summary>
/// <param name="type">The type of value that is passed when jumping to the label.</param>
/// <returns>The new <see cref="LabelTarget"/>.</returns>
public static LabelTarget Label(Type type) {
return Label(type, null);
}
/// <summary>
/// Creates a <see cref="LabelTarget"/> representing a label with the given type and name.
/// </summary>
/// <param name="type">The type of value that is passed when jumping to the label.</param>
/// <param name="name">The name of the label.</param>
/// <returns>The new <see cref="LabelTarget"/>.</returns>
public static LabelTarget Label(Type type, string name) {
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
return new LabelTarget(type, name);
}
}
}
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