165   int pre_pos = in_->position();  in Scan()
166   if (in_->IsEnd()) return DateToken::EndOfInput();  in Scan()
167   if (in_->IsAsciiDigit()) {  in Scan()
168     int n = in_->ReadUnsignedNumeral();  in Scan()
169     int length = in_->position() - pre_pos;  in Scan()
172   if (in_->Skip(':')) return DateToken::Symbol(':');  in Scan()
173   if (in_->Skip('-')) return DateToken::Symbol('-');  in Scan()
174   if (in_->Skip('+')) return DateToken::Symbol('+');  in Scan()
175   if (in_->Skip('.')) return DateToken::Symbol('.');  in Scan()
176   if (in_->Skip(')')) return DateToken::Symbol(')');  in Scan()
177   if (in_->IsAsciiAlphaOrAbove()) {  in Scan()
180     int length = in_->ReadWord(buffer, 3);  in Scan()
186   if (in_->SkipWhiteSpace()) {  in Scan()
187     return DateToken::WhiteSpace(in_->position() - pre_pos);  in Scan()
189   if (in_->SkipParentheses()) {  in Scan()
192   in_->Next();  in Scan()