Class: Kronos

Inherits:
Object
  • Object
show all
Defined in:
lib/kronos.rb,
lib/version.rb

Defined Under Namespace

Modules: Version Classes: Exception, Invalid

Constant Summary collapse

IGNORE_PATTERN = 
Regexp.compile('^prior')

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#day ⇒ Object

Returns the value of attribute day.



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# File 'lib/kronos.rb', line 9

def day
  @day
end

#month ⇒ Object

Returns the value of attribute month.



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# File 'lib/kronos.rb', line 9

def month
  @month
end

#year ⇒ Object

Returns the value of attribute year.



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# File 'lib/kronos.rb', line 9

def year
  @year
end

Class Method Details

.from_hash(h) ⇒ Object 



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# File 'lib/kronos.rb', line 233

def self.from_hash(h)
  o = self.new
  o.year  = h['year']  if h['year']
  o.month = h['month'] if h['month']
  o.day   = h['day']   if h['day']
  o
end

.parse(string) ⇒ Object 



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# File 'lib/kronos.rb', line 241

def self.parse(string)
  self.new.parse(string)
end

Instance Method Details

#<(other) ⇒ Object 



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# File 'lib/kronos.rb', line 146

def <(other)
  if !self.year || !other.year
    false
  elsif self.year < other.year
    true
  elsif self.year > other.year
    false
  elsif self.year == other.year
    if !self.month || !other.month
      false
    elsif self.month < other.month
      true
    elsif self.month > other.month
      false
    elsif self.month == other.month
      if !self.day || !other.day
        false
      elsif self.day < other.day
        true
      elsif self.day > other.day
        false
      elsif self.day == other.day
        false
      else
        raise Exception, 'unexpected error'
      end
    end
  else
    raise Exception, 'unexpected error'
  end
end

#<=(other) ⇒ Object 



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# File 'lib/kronos.rb', line 178

def <=(other)
  (self < other) || (self == other)
end

#==(other) ⇒ Object 



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# File 'lib/kronos.rb', line 182

def ==(other)
  self.year == other.year &&
  self.month == other.month &&
  self.day == other.day 
end

#>(other) ⇒ Object 



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# File 'lib/kronos.rb', line 192

def >(other)
  if !self.year || !other.year
    false
  elsif self.year < other.year
    false
  elsif self.year > other.year
    true
  elsif self.year == other.year
    if !self.month || !other.month
      false
    elsif self.month < other.month
      false
    elsif self.month > other.month
      true
    elsif self.month == other.month
      if !self.day || !other.day
        false
      elsif self.day < other.day
        false
      elsif self.day > other.day
        true
      elsif self.day == other.day
        false
      else
        raise Exception, 'unexpected error'
      end
    end
  else
    raise Exception, 'unexpected error'
  end
end

#>=(other) ⇒ Object 



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# File 'lib/kronos.rb', line 188

def >=(other)
  (self > other) || (self == other)
end

#errors ⇒ Object 



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# File 'lib/kronos.rb', line 113

def errors
  errors = []
  if day && (!month || !year)
    errors << 'if day is given, then month and year must also be given'
  elsif month && !year
    errors << 'if month is given, then year must also be given'
  elsif !year
    errors << 'year must be given'
  else
    if day && !((1 .. 31) === day)
      errors << "day (#{day}) must be between 1 and 31"
    end
    if month && !((1 .. 12) === month)
      errors << "month (#{month}) must be between 1 and 12"
    end
    if year && !((1970 .. 2069) === year)
      errors << "year (#{year}) must be between 1970 and 2069"
    end
    if errors.length == 0 && day && month && year
      begin
        Date.new(year, month, day)
      rescue ArgumentError
        errors << "date (#{year}-#{month}-#{day}) must be valid"
      end
    end
  end
  errors
end

#parse(string) ⇒ Object 



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# File 'lib/kronos.rb', line 13

def parse(string)
  if string.nil? || string =~ IGNORE_PATTERN
    nil # do nothing
  elsif\
    p = parse_date(string, '%Y-%m-%d') || # 1988-09-23
    p = parse_date(string, '%Y-%b-%d') || # 1988-Sep-23
    p = parse_date(string, '%Y-%B-%d') || # 1988-September-23
    p = parse_date(string, '%y-%m-%d') || # 88-9-23
    p = parse_date(string, '%y-%b-%d') || # 88-Sep-23
    p = parse_date(string, '%y-%B-%d') || # 88-September-23
    p = parse_date(string, '%m/%d/%Y') || # 9/23/1988
    p = parse_date(string, '%b/%d/%Y') || # Sep/23/1988
    p = parse_date(string, '%B/%d/%Y') || # September/23/1988
    p = parse_date(string, '%m/%d/%y') || # 11/23/88
    p = parse_date(string, '%b/%d/%y') || # Sep/23/88
    p = parse_date(string, '%B/%d/%y') || # September/23/88
    p = parse_date(string, '%m-%d-%Y') || # 11-23-1988
    p = parse_date(string, '%b-%d-%Y') || # Sep-23-1988
    p = parse_date(string, '%B-%d-%Y') || # September-23-1988
    p = parse_date(string, '%m %d %Y') || # 11 23 1988
    p = parse_date(string, '%b %d %Y') || # Sep 23 1988
    p = parse_date(string, '%B %d %Y') || # September 23 1988
    p = parse_date(string, '%m %d %y') || # 11 23 88
    p = parse_date(string, '%b %d %y') || # Sep 23 88
    p = parse_date(string, '%B %d %y') || # September 23 88
    p = parse_date(string, '%d-%b-%Y') || # 23-Sep-1988
    p = parse_date(string, '%d-%B-%Y') || # 23-September-1988
    p = parse_date(string, '%d-%b-%y') || # 23-Sep-88
    p = parse_date(string, '%d-%B-%y') || # 23-September-88
    p = parse_date(string, '%d %b %Y') || # 23 Sep 1988
    p = parse_date(string, '%d %B %Y') || # 23 September 1988
    p = parse_date(string, '%d %b %y') || # 23 Sep 88
    p = parse_date(string, '%d %B %y') || # 23 September 88
    false
    self.year  = to_full_year(p.year)
    self.month = p.month
    self.day   = p.day
  elsif\
    p = parse_date(string, '%Y-%m') || # 1976-4
    p = parse_date(string, '%Y-%b') || # 1976-Apr
    p = parse_date(string, '%Y-%B') || # 1976-April
    p = parse_date(string, '%m/%Y') || # 4/1976
    p = parse_date(string, '%b/%Y') || # Apr/1976
    p = parse_date(string, '%B/%Y') || # April/1976
    p = parse_date(string, '%m-%Y') || # 4-1976
    p = parse_date(string, '%b-%Y') || # Apr-1976
    p = parse_date(string, '%B-%Y') || # April-1976
    p = parse_date(string, '%m %Y') || # 4 1976
    p = parse_date(string, '%b %Y') || # Apr 1976
    p = parse_date(string, '%B %Y') || # April 1976
    p = parse_date(string, '%m/%y') || # 4/76
    p = parse_date(string, '%b/%y') || # Apr/76
    p = parse_date(string, '%B/%y') || # April/76
    p = parse_date(string, '%m-%y') || # 4-76
    p = parse_date(string, '%b-%y') || # Apr-76
    p = parse_date(string, '%B-%y') || # April-76
    p = parse_date(string, '%m %y') || # 4 76
    p = parse_date(string, '%b %y') || # Apr 76
    p = parse_date(string, '%B %y') || # April 76
    false
    self.year  = to_full_year(p.year)
    self.month = p.month
  elsif\
    p = parse_date(string, '%Y') || # 1991
    p = parse_date(string, '%y') || # 91
    false
    self.year = to_full_year(p.year)
  elsif\
    string =~ /^[']?(\d{2})$/ # '91
    self.year = to_full_year($1.to_i)
  end
  self
end

#parse_date(original, format) ⇒ Object

This method:

1. Swallows ArgumentError from Date.strptime
2. Does not trust a match from Date.strptime unless it matches the
   inverse operation, namely Date#strftime.
3. However, the inverse operation is complicated by the way that
   #strftime handles leading zeros. For now, I have a hack that
   removes leading zeros.



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# File 'lib/kronos.rb', line 94

def parse_date(original, format)
  parsed = Date.strptime(original, format)
  t1 = parsed.strftime(format)
  t2 = t1.gsub('/0', '/').gsub('-0', '-').gsub(/^0/, '')
  return unless original == t1 || original == t2
  parsed
rescue ArgumentError
  nil
end

#to_hash ⇒ Object

Raises:



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# File 'lib/kronos.rb', line 224

def to_hash
  raise Invalid, errors unless valid?
  h = {}
  h['year']  = year  if year
  h['month'] = month if month
  h['day']   = day   if day
  h
end

#to_s ⇒ Object

Raises:



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# File 'lib/kronos.rb', line 104

def to_s
  s = ''
  raise Invalid, errors unless valid?
  s << '%04i' % year if year
  s << '-%02i' % month if month
  s << '-%02i' % day if day
  s
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kronos.rb', line 142

def valid?
  errors.length == 0
end