namespace NTERA.Interpreter.Compiler
{
	public enum Token
	{
		Unknown = 0,

		Identifer,
		Value,

		[LexerCharacter('#', LexerType.Real)]
		Sharp,

		[LexerCharacter('@', LexerType.Real)]
		Function,

		[LexerKeyword("DIM")]
		Dim,

		[LexerKeyword("DIMS")]
		Dims,

		[LexerKeyword("CONST")]
		Const,

		[LexerKeyword("REF")]
		Ref,

		[LexerKeyword("DYNAMIC")]
		Dynamic,

		[LexerKeyword("FUNCTION")]
		[LexerKeyword("FUNCTIONS")]
		ReturnFunction,

		[LexerCharacter('\n', LexerType.Both)]
		NewLine,

		[LexerCharacter(':', LexerType.Real)]
		Colon,

		[LexerCharacter(',', LexerType.Real)]
		Comma,

		[LexerCharacter('{', LexerType.Both)]
		OpenBracket,

		[LexerCharacter('}', LexerType.Both)]
		CloseBracket,
		Format,
		Modulo,

		Plus,
		Increment,
		Minus,
		Decrement,

		[LexerCharacter('/', LexerType.Real)]
		Slash,

		[LexerCharacter('*', LexerType.Real)]
		Asterisk,

		[LexerCharacter('^', LexerType.Real)]
		Caret,
		Equal,
		Less,
		More,
		NotEqual,
		LessEqual,
		MoreEqual,
		Or,
		And,

		[LexerCharacter('!', LexerType.Real)]
		Not,

		[LexerCharacter('(', LexerType.Real)]
		LParen,

		[LexerCharacter(')', LexerType.Real)]
		RParen,

		EOF = -1 //End Of File
	}

	public static class TokenEnumExtensions
	{
		public static bool IsUnary(this Token token)
		{
			return token == Token.Plus
				   || token == Token.Minus
				   || token == Token.Not;
		}

		public static bool IsArithmetic(this Token token)
		{
			return token == Token.Plus
				   || token == Token.Minus
				   || token == Token.Slash
				   || token == Token.Asterisk
				   || token == Token.Modulo
				   || token == Token.Caret
				   || token == Token.Equal
				   || token == Token.NotEqual
				   || token == Token.Less
				   || token == Token.LessEqual
				   || token == Token.More
				   || token == Token.MoreEqual
				   || token == Token.Or
				   || token == Token.And
				   || token == Token.Not;
		}

		public static bool IsStringOp(this Token token)
		{
			return token == Token.Plus;
		}
	}
}