using System;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a declaration modifier.
/// </summary>
public sealed class Modifier : Tree
{
	private readonly ModifierTypes _ModifierType;

	/// <summary>
	/// The type of the modifier.
	/// </summary>
	public ModifierTypes ModifierType => _ModifierType;

	/// <summary>
	/// Constructs a new modifier parse tree.
	/// </summary>
	/// <param name="modifierType">The type of the modifier.</param>
	/// <param name="span">The location of the parse tree.</param>
	public Modifier(ModifierTypes modifierType, Span span)
		: base(TreeType.Modifier, span)
	{
		if ((modifierType & checked(modifierType - 1)) != 0 || modifierType < ModifierTypes.None || modifierType > ModifierTypes.Narrowing)
		{
			throw new ArgumentOutOfRangeException("modifierType");
		}
		_ModifierType = modifierType;
	}
}