Function parseFromPattern

bolt/functions/lib/DateTimeFormatter.cpp:710–1112

using ErrorCode = DateTimeResult::ErrorCode;

ErrorCode parseFromPattern(
    FormatPattern curPattern,
    const std::string_view& input,
    const char*& cur,
    const char* end,
    Date& date,
    bool specifierNext,
    DateTimeFormatterType type,
    bool legacySpark = false) {
  if (curPattern.specifier == DateTimeFormatSpecifier::TIMEZONE_OFFSET_ID) {
    auto size = parseTimezoneOffset(cur, end, date);
    if (size == -1) {
      return ErrorCode::PARSE_TIMEZONE_OFFSET_ERROR;
    }
    cur += size;
  } else if (curPattern.specifier == DateTimeFormatSpecifier::TIMEZONE) {
    auto size = parseTimezone(cur, end, date, legacySpark);
    if (size == -1) {
      return ErrorCode::PARSE_TIMEZONE_ERROR;
    }
    cur += size;
  } else if (curPattern.specifier == DateTimeFormatSpecifier::ERA) {
    auto size = parseEra(cur, end, date);
    if (size == -1) {
      return ErrorCode::PARSE_ERA_ERROR;
    }
    cur += size;
  } else if (
      curPattern.specifier == DateTimeFormatSpecifier::MONTH_OF_YEAR_TEXT) {
    auto size = parseMonthText(cur, end, date);
    if (size == -1) {
      return ErrorCode::PARSE_MONTH_ERROR;
    }
    cur += size;
    if (!date.hasYear) {
      date.hasYear = true;
      date.year = 2000;
    }
  } else if (curPattern.specifier == DateTimeFormatSpecifier::HALFDAY_OF_DAY) {
    auto size = parseHalfDayOfDay(cur, end, date);
    if (size == -1) {
      return ErrorCode::PARSE_HALFDAY_ERROR;
    }
#ifdef SPARK_COMPATIBLE
    date.isHourOfHalfDay = true; // for get_timestamp("PM", "a") case
#endif
    cur += size;
  } else if (
      curPattern.specifier == DateTimeFormatSpecifier::DAY_OF_WEEK_TEXT) {
    auto size = parseDayOfWeekText(cur, end, date);
    if (size == -1) {
      return ErrorCode::PARSE_DAY_ERROR;
    }
    cur += size;
    date.weekDateFormat = true;
    date.dayOfYearFormat = false;
    if (!date.hasYear) {
      date.hasYear = true;