Pytocs.Syntax.Parser.subscript C# (CSharp) Method

        public Slice subscript()
        {
            Exp start = null;
            Exp end = null;
            Exp slice = null;
            int lexPos = lexer.LineNumber;
            if (!Peek(TokenType.COLON))
            {
                start = test();
            }
            if (PeekAndDiscard(TokenType.COLON))
            {
                if (!Peek(TokenType.COLON, TokenType.RBRACKET))
                {
                    end = test();
                }
                if (Peek(TokenType.COLON))
                {
                    slice = sliceop();
                }
            }
            //$REVIEW: fix this [2:]
            return new Slice(start, end, slice,
                filename,
                lexPos,
                lexer.LineNumber);       //$BUG: should be position, not line number.
        }