#define DEBUG
using System;
using System.Diagnostics;

namespace AspClassic.Parser;

/// <summary>
/// The base class for all tokens. Contains line and column information as well as token type.
/// </summary>
public abstract class Token
{
	private readonly TokenType _Type;

	private readonly Span _Span;

	/// <summary>
	/// The type of the token.
	/// </summary>
	public TokenType Type => _Type;

	/// <summary>
	/// The span of the token in the source text.
	/// </summary>
	public Span Span => _Span;

	protected Token(TokenType type, Span span)
	{
		Debug.Assert(Enum.IsDefined(typeof(TokenType), type));
		_Type = type;
		_Span = span;
	}

	/// <summary>
	/// Returns the unreserved keyword type of an identifier.
	/// </summary>
	/// <returns>The unreserved keyword type of an identifier, the token's type otherwise.</returns>
	public virtual TokenType AsUnreservedKeyword()
	{
		return Type;
	}
}