Class: SayWhen::DaysOfWeekCronValue

Inherits:
CronValue
  • Object
show all
Defined in:
lib/say_when/cron_expression.rb

Constant Summary collapse

DAYS = 
Date::ABBR_DAYNAMES.map { |a| a.upcase }

Instance Attribute Summary collapse

Attributes inherited from CronValue

#expression, #max, #min, #part, #values

Instance Method Summary collapse

Methods inherited from CronValue

parse_number

Constructor Details

#initialize(exp) ⇒ DaysOfWeekCronValue 



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# File 'lib/say_when/cron_expression.rb', line 404

def initialize(exp)
  self.is_last = false
  super(:wday, 1, 7, exp)
end

Instance Attribute Details

#is_last ⇒ Object

Returns the value of attribute is_last.



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# File 'lib/say_when/cron_expression.rb', line 402

def is_last
  @is_last
end

#is_specified ⇒ Object

Returns the value of attribute is_specified.



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# File 'lib/say_when/cron_expression.rb', line 402

def is_specified
  @is_specified
end

#nth_day ⇒ Object

Returns the value of attribute nth_day.



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# File 'lib/say_when/cron_expression.rb', line 402

def nth_day
  @nth_day
end

Instance Method Details

#include?(date) ⇒ Boolean 



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# File 'lib/say_when/cron_expression.rb', line 423

def include?(date)
  return true unless is_specified
  if is_last
    last = last_wday(date, values.first).to_date
    date.to_date == last
  elsif nth_day
    date.to_date == nth_wday(nth_day, values.first, date.month, date.year).to_date
  else
    values.include?(date.wday + 1)
  end
end

#last(date) ⇒ Object 



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# File 'lib/say_when/cron_expression.rb', line 435

def last(date)
  last_dow = if !is_specified
    date
  elsif is_last
    last = last_wday(date, values.first)
    if last.to_date > date.to_date
      last = last_wday(1.month.ago(date).change(day: 1), values.first)
    end
    last
  elsif nth_day
    nth = nth_wday(nth_day, values.first, date.month, date.year)
    if nth.to_date > date.to_date
      nth = 1.month.ago(date).change(day: 1)
      nth = nth_wday(nth_day, values.first, nth.month, nth.year)
    end
    nth
  else
    n = values.detect { |v| v > date.wday }
    n = values[0] if n.blank?
    base = (n < (date.wday + 1)) ? 7 : 0
    days_forward = n + (base - (date.wday + 1))
    days_forward.days.since(date)
  end
  last_dow.change(hour: 23, min: 59, sec: 59)
end

#last_wday(date, aWday) ⇒ Object 



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# File 'lib/say_when/cron_expression.rb', line 487

def last_wday(date, aWday)
  wday = aWday - 1
  eom = date.end_of_month
  if eom.wday == wday
    eom
  elsif eom.wday > wday
    (eom.wday - wday).days.ago(eom)
  else
    ((7 - wday) + eom.wday).days.ago(eom)
  end
end

#next(date) ⇒ Object 



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# File 'lib/say_when/cron_expression.rb', line 461

def next(date)
  next_dow = if !is_specified
    date
  elsif is_last
    last = last_wday(date, values.first)
    if last.to_date <= date.to_date
      last = last_wday(1.month.since(date).change(day: 1), values.first)
    end
    last
  elsif nth_day
    nth = nth_wday(nth_day, values.first, date.month, date.year)
    if nth.to_date <= date.to_date
      date = 1.month.since(date)
      nth = nth_wday(nth_day, values.first, date.month, date.year)
    end
    nth
  else
    n = values.detect { |v| v > date.wday }
    n = values[0] if n.blank?
    base = (n < (date.wday + 1)) ? 7 : 0
    days_forward = n + (base - (date.wday + 1))
    days_forward.days.since(date)
  end
  next_dow.change(hour: 0)
end

#nth_wday(n, aWday, month, year) ⇒ Object

compliments of the ruby way



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# File 'lib/say_when/cron_expression.rb', line 500

def nth_wday(n, aWday, month, year)
  wday = aWday - 1
  if (!n.between? 1,5) or
     (!wday.between? 0,6) or
     (!month.between? 1,12)
    raise ArgumentError
  end
  t = Time.zone.local year, month, 1
  first = t.wday
  if first == wday
    fwd = 1
  elsif first < wday
    fwd = wday - first + 1
  elsif first > wday
    fwd = (wday+7) - first + 1
  end
  target = fwd + (n-1)*7
  begin
    t2 = Time.zone.local year, month, target
  rescue ArgumentError
    return nil
  end
  if t2.mday == target
    t2
  else
    nil
  end
end

#parse(exp) ⇒ Object 



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# File 'lib/say_when/cron_expression.rb', line 409

def parse(exp)
  if self.is_specified = !(expression =~ /\?/)
    if exp =~ /[A-Z]+/
      DAYS.each_with_index { |day, index| exp = exp.gsub(day, (index + 1).to_s) }
    end
    case exp
      when /^L$/ then values << max
      when /^(\d+)L$/ then self.is_last = true; values << $1.to_i
      when /^(\d+)#(\d+)/ then self.values << $1.to_i; self.nth_day = $2.to_i
      else super(exp)
    end
  end
end

#to_s ⇒ Object 



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# File 'lib/say_when/cron_expression.rb', line 529

def to_s
  "[e:#{expression}, v:#{values.inspect}, is:#{is_specified}, il:#{is_last}, nd:#{nth_day}]\n"
end