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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics.CodeAnalysis;
using System.Dynamic.Utils;
using System.Linq.Expressions;
namespace System.Dynamic
{
/// <summary>
/// Represents the dynamic get member operation at the call site, providing the binding semantic and the details about the operation.
/// </summary>
[RequiresDynamicCode(Expression.CallSiteRequiresDynamicCode)]
public abstract class GetMemberBinder : DynamicMetaObjectBinder
{
/// <summary>
/// Initializes a new instance of the <see cref="GetMemberBinder" />.
/// </summary>
/// <param name="name">The name of the member to get.</param>
/// <param name="ignoreCase">true if the name should be matched ignoring case; false otherwise.</param>
protected GetMemberBinder(string name, bool ignoreCase)
{
ArgumentNullException.ThrowIfNull(name);
Name = name;
IgnoreCase = ignoreCase;
}
/// <summary>
/// The result type of the operation.
/// </summary>
public sealed override Type ReturnType => typeof(object);
/// <summary>
/// Gets the name of the member to get.
/// </summary>
public string Name { get; }
/// <summary>
/// Gets the value indicating if the string comparison should ignore the case of the member name.
/// </summary>
public bool IgnoreCase { get; }
/// <summary>
/// Performs the binding of the dynamic get member operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic get member operation.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public DynamicMetaObject FallbackGetMember(DynamicMetaObject target)
{
return FallbackGetMember(target, null);
}
/// <summary>
/// When overridden in the derived class, performs the binding of the dynamic get member operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic get member operation.</param>
/// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public abstract DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject? errorSuggestion);
/// <summary>
/// Performs the binding of the dynamic get member operation.
/// </summary>
/// <param name="target">The target of the dynamic get member operation.</param>
/// <param name="args">An array of arguments of the dynamic get member operation.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public sealed override DynamicMetaObject Bind(DynamicMetaObject target, params DynamicMetaObject[]? args)
{
ArgumentNullException.ThrowIfNull(target);
ContractUtils.Requires(args == null || args.Length == 0, nameof(args));
return target.BindGetMember(this);
}
/// <summary>
/// Always returns <c>true</c> because this is a standard <see cref="DynamicMetaObjectBinder"/>.
/// </summary>
internal sealed override bool IsStandardBinder => true;
}
}
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