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104 lines
3.3 KiB
104 lines
3.3 KiB
5 years ago
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// Copyright (c) Microsoft. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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#if !NET_4_6
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using System.Dynamic.Utils;
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using LinqInternal.Core;
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namespace System.Linq.Expressions.Reimplement
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{
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#if NET20 || NET30 || NET35 || !NET_4_6
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/// <summary>
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/// Used to denote the target of a <see cref="GotoExpression"/>.
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/// </summary>
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public sealed class LabelTarget
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{
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private readonly Type _type;
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private readonly string _name;
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internal LabelTarget(Type type, string name)
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{
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_type = type;
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_name = name;
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}
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/// <summary>
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/// Gets the name of the label.
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/// </summary>
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/// <remarks>The label's name is provided for information purposes only.</remarks>
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public string Name
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{
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get { return _name; }
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}
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/// <summary>
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/// The type of value that is passed when jumping to the label
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/// (or System.Void if no value should be passed).
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/// </summary>
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public Type Type
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{
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get { return _type; }
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}
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/// <summary>
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/// Returns a <see cref="string"/> that represents the current <see cref="object"/>.
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/// </summary>
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/// <returns>A <see cref="string"/> that represents the current <see cref="object"/>. </returns>
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public override string ToString()
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{
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return string.IsNullOrEmpty(Name) ? "UnamedLabel" : Name;
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}
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}
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#endif
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#if NET20 || NET30 || !NET_4_6
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public partial class Expression
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{
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/// <summary>
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/// Creates a <see cref="LabelTarget"/> representing a label with void type and no name.
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/// </summary>
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/// <returns>The new <see cref="LabelTarget"/>.</returns>
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public static LabelTarget Label()
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{
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return Label(typeof(void), null);
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}
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/// <summary>
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/// Creates a <see cref="LabelTarget"/> representing a label with void type and the given name.
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/// </summary>
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/// <param name="name">The name of the label.</param>
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/// <returns>The new <see cref="LabelTarget"/>.</returns>
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public static LabelTarget Label(string name)
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{
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return Label(typeof(void), name);
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}
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/// <summary>
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/// Creates a <see cref="LabelTarget"/> representing a label with the given type.
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/// </summary>
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/// <param name="type">The type of value that is passed when jumping to the label.</param>
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/// <returns>The new <see cref="LabelTarget"/>.</returns>
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public static LabelTarget Label(Type type)
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{
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return Label(type, null);
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}
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/// <summary>
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/// Creates a <see cref="LabelTarget"/> representing a label with the given type and name.
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/// </summary>
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/// <param name="type">The type of value that is passed when jumping to the label.</param>
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/// <param name="name">The name of the label.</param>
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/// <returns>The new <see cref="LabelTarget"/>.</returns>
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public static LabelTarget Label(Type type, string name)
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{
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ContractUtils.RequiresNotNull(type, "type");
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TypeHelper.ValidateType(type);
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return new LabelTarget(type, name);
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}
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}
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#endif
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}
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#endif
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