using System;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for Me, MyBase or MyClass.
/// </summary>
public sealed class InstanceExpression : Expression
{
	private InstanceType _InstanceType;

	/// <summary>
	/// The type of the instance expression.
	/// </summary>
	public InstanceType InstanceType => _InstanceType;

	/// <summary>
	/// Constructs a new parse tree for My, MyBase or MyClass.
	/// </summary>
	/// <param name="instanceType">The type of the instance expression.</param>
	/// <param name="span">The location of the parse tree.</param>
	public InstanceExpression(InstanceType instanceType, Span span)
		: base(TreeType.InstanceExpression, span)
	{
		if (instanceType < InstanceType.Me || instanceType > InstanceType.MyBase)
		{
			throw new ArgumentOutOfRangeException("instanceType");
		}
		_InstanceType = instanceType;
	}
}