using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a qualified name expression.
/// </summary>
public sealed class QualifiedExpression : Expression
{
	private readonly Expression _Qualifier;

	private readonly Location _DotLocation;

	private readonly SimpleName _Name;

	/// <summary>
	/// The expression qualifying the name.
	/// </summary>
	public Expression Qualifier => _Qualifier;

	/// <summary>
	/// The location of the '.'.
	/// </summary>
	public Location DotLocation => _DotLocation;

	/// <summary>
	/// The qualified name.
	/// </summary>
	public SimpleName Name => _Name;

	/// <summary>
	/// Constructs a new parse tree for a qualified name expression.
	/// </summary>
	/// <param name="qualifier">The expression qualifying the name.</param>
	/// <param name="dotLocation">The location of the '.'.</param>
	/// <param name="name">The qualified name.</param>
	/// <param name="span">The location of the parse tree.</param>
	public QualifiedExpression(Expression qualifier, Location dotLocation, SimpleName name, Span span)
		: base(TreeType.QualifiedExpression, span)
	{
		if (name == null)
		{
			throw new ArgumentNullException("name");
		}
		SetParent(qualifier);
		SetParent(name);
		_Qualifier = qualifier;
		_DotLocation = dotLocation;
		_Name = name;
	}

	protected override void GetChildTrees(IList<Tree> childList)
	{
		Tree.AddChild(childList, Qualifier);
		Tree.AddChild(childList, Name);
	}
}