BinaryOperationBinder.cs

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using System.Dynamic.Utils;
using System.Linq.Expressions;
 
namespace System.Dynamic;
 
public abstract class BinaryOperationBinder : DynamicMetaObjectBinder
{
    public sealed override Type ReturnType => typeof(object);
 
    public ExpressionType Operation { get; }
 
    internal sealed override bool IsStandardBinder => true;
 
    protected BinaryOperationBinder(ExpressionType operation)
    {
        ContractUtils.Requires(OperationIsValid(operation), "operation");
        Operation = operation;
    }
 
    public DynamicMetaObject FallbackBinaryOperation(DynamicMetaObject target, DynamicMetaObject arg)
    {
        return FallbackBinaryOperation(target, arg, null);
    }
 
    public abstract DynamicMetaObject FallbackBinaryOperation(DynamicMetaObject target, DynamicMetaObject arg, DynamicMetaObject? errorSuggestion);
 
    public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args)
    {
        ContractUtils.RequiresNotNull(target, "target");
        ContractUtils.RequiresNotNull(args, "args");
        ContractUtils.Requires(args.Length == 1, "args");
        DynamicMetaObject dynamicMetaObject = args[0];
        ContractUtils.RequiresNotNull(dynamicMetaObject, "args");
        return target.BindBinaryOperation(this, dynamicMetaObject);
    }
 
    internal static bool OperationIsValid(ExpressionType operation)
    {
        switch (operation)
        {
        case ExpressionType.Add:
        case ExpressionType.And:
        case ExpressionType.Divide:
        case ExpressionType.Equal:
        case ExpressionType.ExclusiveOr:
        case ExpressionType.GreaterThan:
        case ExpressionType.GreaterThanOrEqual:
        case ExpressionType.LeftShift:
        case ExpressionType.LessThan:
        case ExpressionType.LessThanOrEqual:
        case ExpressionType.Modulo:
        case ExpressionType.Multiply:
        case ExpressionType.NotEqual:
        case ExpressionType.Or:
        case ExpressionType.Power:
        case ExpressionType.RightShift:
        case ExpressionType.Subtract:
        case ExpressionType.Extension:
        case ExpressionType.AddAssign:
        case ExpressionType.AndAssign:
        case ExpressionType.DivideAssign:
        case ExpressionType.ExclusiveOrAssign:
        case ExpressionType.LeftShiftAssign:
        case ExpressionType.ModuloAssign:
        case ExpressionType.MultiplyAssign:
        case ExpressionType.OrAssign:
        case ExpressionType.PowerAssign:
        case ExpressionType.RightShiftAssign:
        case ExpressionType.SubtractAssign:
            return true;
        default:
            return false;
        }
    }
}