Class: Period

Inherits:
Object
  • Object
show all
Includes:
Comparable, Enumerable
Defined in:
lib/fat_core/period.rb

Constant Summary collapse

TO_DATE =

These need to come after initialize is defined

Period.new(Date::BOT, Date.current)
FOREVER = 
Period.new(Date::BOT, Date::EOT)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Enumerable

#groups_of

Constructor Details

#initialize(first, last) ⇒ Period

Returns a new instance of Period.


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# File 'lib/fat_core/period.rb', line 9

def initialize(first, last)
  case first
  when String
    begin
      first = Date.parse(first)
    rescue ArgumentError => ex
      if ex.message =~ /invalid date/
        raise ArgumentError, "you gave an invalid date '#{first}'"
      else
        raise
      end
    end
  when Date
    first = first
  else
    raise ArgumentError, "use Date or String to initialize Period"
  end

  case last
  when String
    begin
      last = Date.parse(last)
    rescue ArgumentError => ex
      if ex.message =~ /invalid date/
        raise ArgumentError, "you gave an invalid date '#{last}'"
      else
        raise
      end
    end
  when Date
    last = last
  else
    raise ArgumentError, "use Date or String to initialize Period"
  end

  @first = first
  @last = last
  if @first > @last
    raise ArgumentError, "Period's first date is later than its last date"
  end
end

Instance Attribute Details

#first ⇒ Object

Returns the value of attribute first.


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# File 'lib/fat_core/period.rb', line 7

def first
  @first
end

#last ⇒ Object

Returns the value of attribute last.


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# File 'lib/fat_core/period.rb', line 7

def last
  @last
end

Class Method Details

.chunk_sym_to_days(sym) ⇒ Object 


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# File 'lib/fat_core/period.rb', line 166

def self.chunk_sym_to_days(sym)
  case sym
  when :day
    1
  when :week
    7
  when :biweek
    14
  when :semimonth
    15
  when :month
    30
  when :bimonth
    60
  when :quarter
    90
  when :year
    365
  when :irregular
    30
  else
    raise ArgumentError, "unknown chunk sym '#{sym}'"
  end
end

.chunk_sym_to_max_days(sym) ⇒ Object

The largest number of days possible in each chunk


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# File 'lib/fat_core/period.rb', line 192

def self.chunk_sym_to_max_days(sym)
  case sym
  when :semimonth
    16
  when :month
    31
  when :bimonth
    62
  when :quarter
    92
  when :year
    366
  when :irregular
    raise ArgumentError, "no maximum period for :irregular chunk"
  else
    chunk_sym_to_days(sym)
  end
end

.chunk_syms ⇒ Object

Return an array of periods that represent the concatenation of all adjacent periods in the given periods. def self.meld_periods(*periods)

melded_periods = []
while (this_period = periods.pop)
  melded_periods.each do |mp|
    if mp.overlaps?(this_period)
      melded_periods.delete(mp)
      melded_periods << mp.union(this_period)
      break
    elsif mp.contiguous?(this_period)
      melded_periods.delete(mp)
      melded_periods << mp.join(this_period)
      break
    end
  end
end
melded_periods

end


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# File 'lib/fat_core/period.rb', line 161

def self.chunk_syms
  [:day, :week, :biweek, :semimonth, :month, :bimonth,
   :quarter, :year, :irregular]
end

.days_to_chunk_sym(days) ⇒ Object

This is only used for inferring statement frequency based on the number of days between statements, so it will not consider all possible chunks, only :year, :quarter, :month, and :week. And distinguishing between :semimonth and :biweek is impossible in some cases since a :semimonth can be 14 days just like a :biweek. This ignores that possiblity and requires a :semimonth to be at least 15 days.


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# File 'lib/fat_core/period.rb', line 218

def self.days_to_chunk_sym(days)
  case days
  when 356..376
    :year
  when 86..96
    :quarter
  when 59..62
    :bimonth
  when 26..33
    :month
  when 15..16
    :semimonth
  when 14
    :biweek
  when 7
    :week
  when 1
    :day
  else
    :irregular
  end
end

.parse_spec(from = 'today', to = nil) ⇒ Object

Return a period based on two date specs (see Date.parse_spec), a ”‘from’ and a ‘to’ spec. If the to-spec is not given or is nil, the from-spec is used for both the from- and to-spec. If no from-spec is given, return today as the period.


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# File 'lib/fat_core/period.rb', line 130

def self.parse_spec(from = 'today', to = nil)
  to ||= from
  from ||= to
  Period.new(Date.parse_spec(from, :from), Date.parse_spec(to, :to))
end

Instance Method Details

#!=(other) ⇒ Object

Comparable does not include this.


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# File 'lib/fat_core/period.rb', line 85

def !=(other)
  !(self == other)
end

#<=>(other) ⇒ Object

Comparable base: periods are equal only if their first and last dates are equal. Sorting will be by first date, then last, so periods starting on the same date will sort by last date, thus, from smallest to largest in size.


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# File 'lib/fat_core/period.rb', line 80

def <=>(other)
  [first, size] <=> [other.first, other.size]
end

#===(date) ⇒ Object

Case equality checks for inclusion of date in period.


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# File 'lib/fat_core/period.rb', line 99

def ===(date)
  self.contains?(date)
end

#chunk_name ⇒ Object

Name for a period not necessarily ending on calendar boundaries. For example, in reporting reconciliation, we want the period from Feb 11, 2014, to March 10, 2014, be called the ‘Month ending March 10, 2014,’ event though the period is not a calendar month. Using the stricter Period#chunk_sym, would not allow such looseness.


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# File 'lib/fat_core/period.rb', line 355

def chunk_name
  case Period.days_to_chunk_sym(length)
  when :year
    'Year'
  when :quarter
    'Quarter'
  when :bimonth
    'Bi-month'
  when :month
    'Month'
  when :semimonth
    'Semi-month'
  when :biweek
    'Bi-week'
  when :week
    'Week'
  when :day
    'Day'
  else
    'Period'
  end
end

#chunk_sym ⇒ Object

returns the chunk sym represented by the period


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# File 'lib/fat_core/period.rb', line 321

def chunk_sym
  if first.beginning_of_year? && last.end_of_year? &&
      (365..366) === last - first + 1
    :year
  elsif first.beginning_of_quarter? && last.end_of_quarter? &&
      (90..92) === last - first + 1
    :quarter
  elsif first.beginning_of_bimonth? && last.end_of_bimonth? &&
      (58..62) === last - first + 1
    :bimonth
  elsif first.beginning_of_month? && last.end_of_month? &&
      (28..31) === last - first + 1
    :month
  elsif first.beginning_of_semimonth? && last.end_of_semimonth &&
      (13..16) === last - first + 1
    :semimonth
  elsif first.beginning_of_biweek? && last.end_of_biweek? &&
      last - first + 1 == 14
    :biweek
  elsif first.beginning_of_week? && last.end_of_week? &&
      last - first + 1 == 7
    :week
  elsif first == last
    :day
  else
    :irregular
  end
end

#chunks(size: :month, partial_first: false, partial_last: false, round_up_last: false) ⇒ Object

Return an array of Periods wholly-contained within self in chunks of size, defaulting to monthly chunks. Partial chunks at the beginning and end of self are not included unless partial_first or partial_last, respectively, are set true. The last chunk can be made to extend beyond the end of self to make it a whole chunk if round_up_last is set true, in which case, partial_last is ignored.


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# File 'lib/fat_core/period.rb', line 413

def chunks(size: :month, partial_first: false, partial_last: false, round_up_last: false)
  size = size.to_sym
  result = []
  chunk_start = first.dup
  while chunk_start <= last
    case size
    when :year
      unless partial_first
        until chunk_start.beginning_of_year?
          chunk_start += 1.day
        end
      end
      chunk_end = chunk_start.end_of_year
    when :quarter
      unless partial_first
        until chunk_start.beginning_of_quarter?
          chunk_start += 1.day
        end
      end
      chunk_end = chunk_start.end_of_quarter
    when :bimonth
      unless partial_first
        until chunk_start.beginning_of_bimonth?
          chunk_start += 1.day
        end
      end
      chunk_end = (chunk_start.end_of_month + 1.day).end_of_month
    when :month
      unless partial_first
        until chunk_start.beginning_of_month?
          chunk_start += 1.day
        end
      end
      chunk_end = chunk_start.end_of_month
    when :semimonth
      unless partial_first
        until chunk_start.beginning_of_semimonth?
          chunk_start += 1.day
        end
      end
      chunk_end = chunk_start.end_of_semimonth
    when :biweek
      unless partial_first
        until chunk_start.beginning_of_biweek?
          chunk_start += 1.day
        end
      end
      chunk_end = chunk_start.end_of_biweek
    when :week
      unless partial_first
        until chunk_start.beginning_of_week?
          chunk_start += 1.day
        end
      end
      chunk_end = chunk_start.end_of_week
    when :day
      chunk_end = chunk_start
    else
      chunk_end = last
    end
    if chunk_end <= last
      result << Period.new(chunk_start, chunk_end)
    else
      if round_up_last
        result << Period.new(chunk_start, chunk_end)
      elsif partial_last
        result << Period.new(chunk_start, last)
      else
        break
      end
    end
    chunk_start = result.last.last + 1.day
  end
  result
end

#contains?(date) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 378

def contains?(date)
  if date.respond_to?(:to_date)
    date = date.to_date
  end
  unless (date.is_a? Date)
    raise ArgumentError, "argument must be a Date"
  end
  self.to_range.cover?(date)
end

#days ⇒ Object

Return the number of days in the period


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# File 'lib/fat_core/period.rb', line 104

def days
  last - first + 1
end

#difference(other) ⇒ Object Also known as: - 


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# File 'lib/fat_core/period.rb', line 314

def difference(other)
  ranges = self.to_range.difference(other.to_range)
  ranges.each.map{ |r| Period.new(r.first, r.last) }
end

#each ⇒ Object

Enumerable base. Yield each day in the period.


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# File 'lib/fat_core/period.rb', line 90

def each
  d = first
  while d <= last
    yield d
    d = d + 1.day
  end
end

#gaps(periods) ⇒ Object 


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# File 'lib/fat_core/period.rb', line 402

def gaps(periods)
  to_range.gaps(periods.map { |p| p.to_range }).
    map { |r| Period.new(r.first, r.last)}
end

#has_overlaps_within?(periods) ⇒ Boolean

Return whether any of the Periods that are within self overlap one another

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 394

def has_overlaps_within?(periods)
  self.to_range.has_overlaps_within?(periods.map{ |p| p.to_range})
end

#intersection(other) ⇒ Object Also known as: &, narrow_to 


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# File 'lib/fat_core/period.rb', line 297

def intersection(other)
  result = self.to_range.intersection(other.to_range)
  if result.nil?
    nil
  else
    Period.new(result.first, result.last)
  end
end

#length ⇒ Object 


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# File 'lib/fat_core/period.rb', line 273

def length
  size
end

#months(days_in_month = 30.436875) ⇒ Object

Return the fractional number of months in the period. By default, use the average number of days in a month, but allow the user to override the assumption with a parameter.


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# File 'lib/fat_core/period.rb', line 111

def months(days_in_month = 30.436875)
  (days / days_in_month).to_f
end

#overlaps?(other) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 293

def overlaps?(other)
  self.to_range.overlaps?(other.to_range)
end

#proper_subset_of?(other) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 281

def proper_subset_of?(other)
  to_range.proper_subset_of?(other.to_range)
end

#proper_superset_of?(other) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 289

def proper_superset_of?(other)
  to_range.proper_superset_of?(other.to_range)
end

#size ⇒ Object

Days in period


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# File 'lib/fat_core/period.rb', line 269

def size
  (last - first + 1).to_i
end

#spanned_by?(periods) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 398

def spanned_by?(periods)
  to_range.spanned_by?(periods.map { |p| p.to_range })
end

#subset_of?(other) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 277

def subset_of?(other)
  to_range.subset_of?(other.to_range)
end

#superset_of?(other) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/fat_core/period.rb', line 285

def superset_of?(other)
  to_range.superset_of?(other.to_range)
end

#tex_quote ⇒ Object

Allow erb documents can directly interpolate ranges


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# File 'lib/fat_core/period.rb', line 264

def tex_quote
  "#{first.iso}--#{last.iso}"
end

#to_range ⇒ Object 


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# File 'lib/fat_core/period.rb', line 241

def to_range
  (first..last)
end

#to_s ⇒ Object 


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# File 'lib/fat_core/period.rb', line 245

def to_s
  if first.beginning_of_year? && last.end_of_year? && first.year == last.year
    "#{first.year}"
  elsif first.beginning_of_quarter? &&
      last.end_of_quarter? &&
      first.year == last.year &&
      first.quarter == last.quarter
    "#{first.year}-#{first.quarter}Q"
  elsif first.beginning_of_month? &&
      last.end_of_month? &&
      first.year == last.year &&
      first.month == last.month
    "#{first.year}-%02d" % first.month
  else
    "#{first.iso} to #{last.iso}"
  end
end

#trading_days ⇒ Object 


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# File 'lib/fat_core/period.rb', line 122

def trading_days
  select(&:nyse_workday?)
end

#union(other) ⇒ Object Also known as: + 


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# File 'lib/fat_core/period.rb', line 308

def union(other)
  result = self.to_range.union(other.to_range)
  Period.new(result.first, result.last)
end

#years(days_in_year = 365.2425) ⇒ Object

Return the fractional number of years in the period. By default, use the average number of days in a year, but allow the user to override the assumption with a parameter.


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# File 'lib/fat_core/period.rb', line 118

def years(days_in_year = 365.2425)
  (days / days_in_year).to_f
end