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using EC.Helper.RabbitFunc.Runtime;
using MissingMemberException = EC.Helper.RabbitFunc.Runtime.MissingMemberException;
namespace EC.Helper.RabbitFunc.Expressions;
public class ParameterExpression : Expression
{
internal ParameterExpression(ExpressionType nodeType, Type type, string name)
: base(nodeType)
{
Type = type;
Name = name;
}
public override Type Type { get; }
public string Name { get; }
internal static object Access(RuntimeContext context, string name)
{
var value = context.Access(name);
if (value == null)
throw new MissingMemberException(string.Format("missing member:{0}", name));
return value.Value;
}
internal static T Access<T>(RuntimeContext context, string name)
{
return (T)Access(context, name);
}
public override object Eval(RuntimeContext context)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
return Access(context, Name);
}
public override string ToString()
{
return Name;
}
}