Class: Circa::Date

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/circa/date.rb

Overview

Manage partial dates.

Constant Summary collapse

REGEX =

Match partial dates in format %Y-%m-%d

/^(\d{4})(?:-(0[0-9]|1[0-2])(?:-([0-2][0-9]|3[0-1])))$/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(date_string) ⇒ Date

Create a new Circa::Date

Parameters:

  • date_string (String) —

    A string in format %Y-%m-%d

Raises:

  • (ArgumentError) —

    If an invalid string is given



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# File 'lib/circa/date.rb', line 26

def initialize(date_string)
  @year = '0000'
  @month = '00'
  @day = '00'
  @valid_parts = {}
  unless validate(date_string)
    raise ArgumentError, "Invalid date: #{date_string}"
  end
end

Instance Attribute Details

#valid_parts ⇒ Hash (readonly)

Returns A hash of valid parts in the date, with keys [:year, :month, :day] where applicable, and according values.

Returns:

  • (Hash) —

    A hash of valid parts in the date, with keys [:year, :month, :day] where applicable, and according values



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# File 'lib/circa/date.rb', line 13

class Date
  include Util

  # Match partial dates in format %Y-%m-%d
  REGEX = /^(\d{4})(?:-(0[0-9]|1[0-2])(?:-([0-2][0-9]|3[0-1])))$/

  attr_reader :valid_parts

  # Create a new {Circa::Date}
  # @param [String] date_string
  #   A string in format %Y-%m-%d
  # @raise [ArgumentError]
  #  If an invalid string is given
  def initialize(date_string)
    @year = '0000'
    @month = '00'
    @day = '00'
    @valid_parts = {}
    unless validate(date_string)
      raise ArgumentError, "Invalid date: #{date_string}"
    end
  end

  # Get the date as a string
  # @return [String]
  #   A string in format %Y-%m-%d
  def to_s
    "#{@year}-#{@month}-#{@day}"
  end

  # Get the date as a {::Date}
  # @return [::Date]
  #   A {::Date}
  def to_date
    return nil if valid_parts.empty?
    parts = [:year, :month, :day]
    args = valid_parts_as_args(parts)
    ::Date.send(:new, *args)
  end

  private

  def validate(date_string)
    matches = REGEX.match(date_string)
    return false if matches.nil?
    set_year(matches) && set_month(matches) && set_day(matches)
  end

  def set_year(matches)
    @year = matches[1]
    set_dependent(@year, matches[2], :year)
  end

  def set_month(matches)
    @month = matches[2]
    set_dependent(@month, matches[3], :month)
  end

  def set_dependent(a, b, name)
    a.to_i > 0 ? @valid_parts[name] = a : b.to_i == 0
  end

  def set_day(matches)
    @day = matches[3]
    if @day.to_i > 0
      return false unless ::Date.strptime(matches[0]).to_s == matches[0]
      @valid_parts[:day] = @day
    end
    true
  end
end

Instance Method Details

#to_date ⇒ ::Date

Get the date as a Date

Returns:

  • (::Date) —

    A Date



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# File 'lib/circa/date.rb', line 46

def to_date
  return nil if valid_parts.empty?
  parts = [:year, :month, :day]
  args = valid_parts_as_args(parts)
  ::Date.send(:new, *args)
end

#to_s ⇒ String

Get the date as a string

Returns:

  • (String) —

    A string in format %Y-%m-%d



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# File 'lib/circa/date.rb', line 39

def to_s
  "#{@year}-#{@month}-#{@day}"
end