using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a Using block statement.
/// </summary>
public sealed class UsingBlockStatement : ExpressionBlockStatement
{
	private readonly VariableDeclaratorCollection _VariableDeclarators;

	/// <summary>
	/// The variable declarators, if no expression.
	/// </summary>
	public VariableDeclaratorCollection VariableDeclarators => _VariableDeclarators;

	/// <summary>
	/// Constructs a new parse tree for a Using statement block with an expression.
	/// </summary>
	/// <param name="expression">The expression.</param>
	/// <param name="statements">The statements in the block.</param>
	/// <param name="endStatement">The End statement for the block, if any.</param>
	/// <param name="span">The location of the parse tree.</param>
	/// <param name="comments">The comments for the parse tree.</param>
	public UsingBlockStatement(Expression expression, StatementCollection statements, EndBlockStatement endStatement, Span span, IList<Comment> comments)
		: base(TreeType.UsingBlockStatement, expression, statements, endStatement, span, comments)
	{
	}

	/// <summary>
	/// Constructs a new parse tree for a Using statement block with variable declarators.
	/// </summary>
	/// <param name="variableDeclarators">The variable declarators.</param>
	/// <param name="statements">The statements in the block.</param>
	/// <param name="endStatement">The End statement for the block, if any.</param>
	/// <param name="span">The location of the parse tree.</param>
	/// <param name="comments">The comments for the parse tree.</param>
	public UsingBlockStatement(VariableDeclaratorCollection variableDeclarators, StatementCollection statements, EndBlockStatement endStatement, Span span, IList<Comment> comments)
		: base(TreeType.UsingBlockStatement, null, statements, endStatement, span, comments)
	{
		if (variableDeclarators == null)
		{
			throw new ArgumentNullException("variableDeclarators");
		}
		SetParent(variableDeclarators);
		_VariableDeclarators = variableDeclarators;
	}

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