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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;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Dynamic;
using System.Numerics.Hashing;
using Microsoft.CSharp.RuntimeBinder.Errors;
using Microsoft.CSharp.RuntimeBinder.Semantics;
namespace Microsoft.CSharp.RuntimeBinder
{
/// <summary>
/// Represents a dynamic property access in C#, providing the binding semantics and the details about the operation.
/// Instances of this class are generated by the C# compiler.
/// </summary>
[RequiresUnreferencedCode(Binder.TrimmerWarning)]
internal sealed class CSharpSetMemberBinder : SetMemberBinder, ICSharpBinder
{
public BindingFlag BindingFlags => 0;
public Expr DispatchPayload(RuntimeBinder runtimeBinder, ArgumentObject[] arguments, LocalVariableSymbol[] locals)
=> runtimeBinder.BindAssignment(this, arguments, locals);
public void PopulateSymbolTableWithName(Type callingType, ArgumentObject[] arguments)
=> SymbolTable.PopulateSymbolTableWithName(Name, null, arguments[0].Type);
public bool IsBinderThatCanHaveRefReceiver => false;
internal bool IsCompoundAssignment { get; }
private readonly CSharpArgumentInfo[] _argumentInfo;
CSharpArgumentInfo ICSharpBinder.GetArgumentInfo(int index) => _argumentInfo[index];
private readonly RuntimeBinder _binder;
private readonly Type _callingContext;
private bool IsChecked => _binder.IsChecked;
//////////////////////////////////////////////////////////////////////
/// <summary>
/// Initializes a new instance of the <see cref="SetMemberBinder" />.
/// </summary>
/// <param name="name">The name of the member to get.</param>
/// <param name="isCompoundAssignment">True if the assignment comes from a compound assignment in source.</param>
/// <param name="isChecked">True if the operation is defined in a checked context; otherwise, false.</param>
/// <param name="callingContext">The <see cref="Type"/> that indicates where this operation is defined.</param>
/// <param name="argumentInfo">The sequence of <see cref="CSharpArgumentInfo"/> instances for the arguments to this operation.</param>
public CSharpSetMemberBinder(
string name,
bool isCompoundAssignment,
bool isChecked,
Type callingContext,
IEnumerable<CSharpArgumentInfo> argumentInfo) :
base(name, false)
{
IsCompoundAssignment = isCompoundAssignment;
_argumentInfo = BinderHelper.ToArray(argumentInfo);
_callingContext = callingContext;
_binder = new RuntimeBinder(callingContext, isChecked);
}
public int GetGetBinderEquivalenceHash()
{
int hash = _callingContext?.GetHashCode() ?? 0;
if (IsChecked)
{
hash = HashHelpers.Combine(hash, 1);
}
if (IsCompoundAssignment)
{
hash = HashHelpers.Combine(hash, 1);
}
hash = HashHelpers.Combine(hash, Name.GetHashCode());
hash = BinderHelper.AddArgHashes(hash, _argumentInfo);
return hash;
}
public bool IsEquivalentTo(ICSharpBinder other)
{
var otherBinder = other as CSharpSetMemberBinder;
if (otherBinder == null)
{
return false;
}
if (Name != otherBinder.Name ||
_callingContext != otherBinder._callingContext ||
IsChecked != otherBinder.IsChecked ||
IsCompoundAssignment != otherBinder.IsCompoundAssignment ||
_argumentInfo.Length != otherBinder._argumentInfo.Length)
{
return false;
}
return BinderHelper.CompareArgInfos(_argumentInfo, otherBinder._argumentInfo);
}
/// <summary>
/// Performs the binding of the dynamic set member operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic set member operation.</param>
/// <param name="value">The value to set to the member.</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 override DynamicMetaObject FallbackSetMember(DynamicMetaObject target, DynamicMetaObject value, DynamicMetaObject errorSuggestion)
{
#if ENABLECOMBINDER
DynamicMetaObject com;
if (ComInterop.ComBinder.TryBindSetMember(this, target, value, out com))
{
return com;
}
#else
BinderHelper.ThrowIfUsingDynamicCom(target);
#endif
BinderHelper.ValidateBindArgument(target, nameof(target));
BinderHelper.ValidateBindArgument(value, nameof(value));
return BinderHelper.Bind(this, _binder, new[] { target, value }, _argumentInfo, errorSuggestion);
}
}
}
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