using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a ReDim statement.
/// </summary>
public sealed class ReDimStatement : Statement
{
	private readonly Location _PreserveLocation;

	private readonly ExpressionCollection _Variables;

	/// <summary>
	/// The location of the 'Preserve', if any.
	/// </summary>
	public Location PreserveLocation => _PreserveLocation;

	/// <summary>
	/// The variables to redimension (includes bounds).
	/// </summary>
	public ExpressionCollection Variables => _Variables;

	/// <summary>
	/// Whether the statement included a Preserve keyword.
	/// </summary>
	public bool IsPreserve => PreserveLocation.IsValid;

	/// <summary>
	/// Constructs a new parse tree for a ReDim statement.
	/// </summary>
	/// <param name="preserveLocation">The location of the 'Preserve', if any.</param>
	/// <param name="variables">The variables to redimension (includes bounds).</param>
	/// <param name="span">The location of the parse tree.</param>
	/// <param name="comments">The comments for the parse tree.</param>
	public ReDimStatement(Location preserveLocation, ExpressionCollection variables, Span span, IList<Comment> comments)
		: base(TreeType.ReDimStatement, span, comments)
	{
		if (variables == null)
		{
			throw new ArgumentNullException("variables");
		}
		SetParent(variables);
		_PreserveLocation = preserveLocation;
		_Variables = variables;
	}

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