Method parse

bolt/functions/lib/DateTimeFormatter.cpp:1642–1718

}

DateTimeResult DateTimeFormatter::parse(const std::string_view& input) const {
  Date date;
  const char* cur = input.data();
  const char* end = cur + input.size();

  for (int i = 0; i < tokens_.size(); i++) {
    auto& tok = tokens_[i];
    switch (tok.type) {
      case DateTimeToken::Type::kLiteral:
        if (tok.literal.size() > end - cur ||
            std::memcmp(cur, tok.literal.data(), tok.literal.size()) != 0) {
          return ErrorCode::PARSE_LITERAL_ERROR;
        }
        cur += tok.literal.size();
        break;
      case DateTimeToken::Type::kPattern:
        if (i + 1 < tokens_.size() &&
            tokens_[i + 1].type == DateTimeToken::Type::kPattern) {
          auto errorCode =
              parseFromPattern(tok.pattern, input, cur, end, date, true, type_);
          if (errorCode != ErrorCode::NO_ERROR) {
            return errorCode;
          }
        } else {
          auto errorCode = parseFromPattern(
              tok.pattern, input, cur, end, date, false, type_);
          if (errorCode != ErrorCode::NO_ERROR) {
            return errorCode;
          }
        }
        break;
    }
  }

  // Era is BC and year of era is provided
  if (date.isYearOfEra && !date.isAd) {
    date.year = -1 * (date.year - 1);
  }

  if (date.isHourOfHalfDay) {
    if (!date.isAm) {
      date.hour += 12;
    }
  }

  // Ensure all day of month values are valid for ending month value
  for (int i = 0; i < date.dayOfMonthValues.size(); i++) {
    if (!util::isValidDate(date.year, date.month, date.dayOfMonthValues[i])) {
      return ErrorCode::DAY_OUT_OF_RANGE;
    }
  }

  // Ensure all day of year values are valid for ending year value
  for (int i = 0; i < date.dayOfYearValues.size(); i++) {
    if (!util::isValidDayOfYear(date.year, date.dayOfYearValues[i])) {
      return ErrorCode::DAY_OUT_OF_RANGE;
    }
  }