Class: TimeStep::Calendar

Inherits:
Object
  • Object
show all
Defined in:
lib/timesteps/timestep_calendar.rb

Constant Summary collapse

DateTimeType = 
{
  :standard => DateTime,
  :proleptic_gregorian => DateTime,
  :proleptic_julian => DateTime,
  :noleap => DateTime::NoLeap,
  :allleap => DateTime::AllLeap,
  SYM_360_day => DateTime::Fixed360Day,
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(calendar = "standard", tz: nil) ⇒ Calendar

Construct the object



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# File 'lib/timesteps/timestep_calendar.rb', line 28

def initialize (calendar = "standard", tz: nil)
  unless calendar.is_a?(String)
    raise ArgumentError, "argument calendar '#{calendar}' should be string" 
  end
  @name = calendar
  case @name.downcase.intern
  when :standard, :gregorian
    @calendar = :standard
  when :proleptic_gregorian
    @calendar = :proleptic_gregorian
  when :proleptic_julian, :julian
    @calendar = :proleptic_julian
  when :noleap, SYM_365_day
    @calendar = :noleap
  when :allleap, SYM_366_day
    @calendar = :allleap
  when SYM_360_day
    @calendar = SYM_360_day
  end
  if tz 
    raise "'standard' calendar needed for tz" unless @calendar == :standard
    case tz
    when nil
    when String
      @tz = TZInfo::Timezone.get(tz)
    when TZInfo::Timezone
      @tz = tz
    else
      raise "invalid tz specification"
    end
  end
end

Instance Attribute Details

#calendar ⇒ Object (readonly)

Returns the value of attribute calendar.



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# File 'lib/timesteps/timestep_calendar.rb', line 61

def calendar
  @calendar
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/timesteps/timestep_calendar.rb', line 61

def name
  @name
end

#tz ⇒ Object (readonly)

Returns the value of attribute tz.



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# File 'lib/timesteps/timestep_calendar.rb', line 61

def tz
  @tz
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/timesteps/timestep_calendar.rb', line 67

def == (other)
  return @calendar == other.calendar 
end

#date2jday(year, month, day) ⇒ Object 



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# File 'lib/timesteps/timestep_calendar.rb', line 135

def date2jday (year, month, day)
  return time_new(year, month, day).jd
end

#inspect ⇒ Object 



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# File 'lib/timesteps/timestep_calendar.rb', line 63

def inspect 
  "#<TimeStep::Calendar calendar='#{@calendar.to_s}'>"
end

#jday2date(jday) ⇒ Object 



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# File 'lib/timesteps/timestep_calendar.rb', line 114

def jday2date (jday)
  case @calendar
  when :standard
    time = DateTime.jd(jday, 0, 0, 0, 0, Date::ITALY)
  when :proleptic_gregorian
    time = DateTime.jd(jday, 0, 0, 0, 0, Date::GREGORIAN)
  when :proleptic_julian
    time = DateTime.jd(jday, 0, 0, 0, 0, Date::JULIAN)
  when :noleap
    time = DateTime::NoLeap.jd(jday, 0, 0, 0, 0)
  when :allleap
    time = DateTime::AllLeap.jd(jday, 0, 0, 0, 0)
  when SYM_360_day
    time = DateTime::Fixed360Day.jd(jday, 0, 0, 0, 0)
  end
  if @tz
    time = @tz.to_local(time)
  end
  return time
end

#parse(timespec, format: nil, offset: nil) ⇒ DateTime object

Parses the given representation of date and time in the calendar, and creates an date time instance.



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# File 'lib/timesteps/timestep_calendar.rb', line 89

def parse (timespec, format: nil, offset: nil)
  return DateTime.parse_timestamp(timespec, calendar: @calendar.to_s, format: format, tz: @tz, offset: offset)
end

#time_new(year, month, day, hour = 0, min = 0, sec = 0, offset = 0) ⇒ Object 



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# File 'lib/timesteps/timestep_calendar.rb', line 93

def time_new (year, month, day, hour=0, min=0, sec=0, offset=0)
  case @calendar
  when :standard
    time = DateTime.new(year, month, day, hour, min, sec, offset, Date::ITALY)
  when :proleptic_gregorian
    time = DateTime.new(year, month, day, hour, min, sec, offset, Date::GREGORIAN)
  when :proleptic_julian
    time = DateTime.new(year, month, day, hour, min, sec, offset, Date::JULIAN)
  when :noleap
    time = DateTime::NoLeap.new(year, month, day, hour, min, sec, offset)
  when :allleap
    time = DateTime::AllLeap.new(year, month, day, hour, min, sec, offset)
  when SYM_360_day
    time = DateTime::Fixed360Day.new(year, month, day, hour, min, sec, offset)
  end
  if @tz
    time = @tz.to_local(time)
  end
  return time
end

#valid_datetime_type?(time) ⇒ Boolean 



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# File 'lib/timesteps/timestep_calendar.rb', line 71

def valid_datetime_type? (time)
  return false unless time.is_a?(DateTimeType[@calendar])
  case @calendar
  when :standard
    return time.start == Date::ITALY
  when :proleptic_gregorian
    return time.start == Date::GREGORIAN
  when :proleptic_julian
    return time.start == Date::JULIAN
  else
    return true
  end 
end