function scanNext()

in src/impl/parser.ts [418:462]
45 lines of code
15 McCabe index (conditional complexity)

	function scanNext(): SyntaxKind {
		while (true) {
			const token = _scanner.scan();
			switch (_scanner.getTokenError()) {
				case ScanError.InvalidUnicode:
					handleError(ParseErrorCode.InvalidUnicode);
					break;
				case ScanError.InvalidEscapeCharacter:
					handleError(ParseErrorCode.InvalidEscapeCharacter);
					break;
				case ScanError.UnexpectedEndOfNumber:
					handleError(ParseErrorCode.UnexpectedEndOfNumber);
					break;
				case ScanError.UnexpectedEndOfComment:
					if (!disallowComments) {
						handleError(ParseErrorCode.UnexpectedEndOfComment);
					}
					break;
				case ScanError.UnexpectedEndOfString:
					handleError(ParseErrorCode.UnexpectedEndOfString);
					break;
				case ScanError.InvalidCharacter:
					handleError(ParseErrorCode.InvalidCharacter);
					break;
			}
			switch (token) {
				case SyntaxKind.LineCommentTrivia:
				case SyntaxKind.BlockCommentTrivia:
					if (disallowComments) {
						handleError(ParseErrorCode.InvalidCommentToken);
					} else {
						onComment();
					}
					break;
				case SyntaxKind.Unknown:
					handleError(ParseErrorCode.InvalidSymbol);
					break;
				case SyntaxKind.Trivia:
				case SyntaxKind.LineBreakTrivia:
					break;
				default:
					return token;
			}
		}
	}