using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a call or index expression.
/// </summary>
public sealed class CallOrIndexExpression : Expression
{
	private readonly Expression _TargetExpression;

	private readonly ArgumentCollection _Arguments;

	/// <summary>
	/// The target of the call or index.
	/// </summary>
	public Expression TargetExpression => _TargetExpression;

	/// <summary>
	/// The arguments to the call or index.
	/// </summary>
	public ArgumentCollection Arguments => _Arguments;

	/// <summary>
	/// Constructs a new parse tree for a call or index expression.
	/// </summary>
	/// <param name="targetExpression">The target of the call or index.</param>
	/// <param name="arguments">The arguments to the call or index.</param>
	/// <param name="span">The location of the parse tree.</param>
	public CallOrIndexExpression(Expression targetExpression, ArgumentCollection arguments, Span span)
		: base(TreeType.CallOrIndexExpression, span)
	{
		if (targetExpression == null)
		{
			throw new ArgumentNullException("targetExpression");
		}
		SetParent(targetExpression);
		SetParent(arguments);
		_TargetExpression = targetExpression;
		_Arguments = arguments;
	}

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