Class: CocinaDisplay::Dates::RomanNumeralYearFormat

Inherits:
ExtractorDateFormat show all
Defined in:
lib/cocina_display/dates/date.rb

Overview

Extractor for dates encoded as Roman numerals.

Direct Known Subclasses

RomanNumeralCenturyFormat

Constant Summary collapse

REGEX = 
/(?<![A-Za-z\.])(?<year>[MCDLXVI\.]+)(?![A-Za-z])/

Constants inherited from Date

Date::BCE_CHAR_SORT_MAP, Date::UNPARSABLE_VALUES

Instance Attribute Summary

Attributes inherited from Date

#cocina, #date, #type

Class Method Summary collapse

Methods inherited from ExtractorDateFormat

supports?

Methods inherited from Date

#<=>, #approximate?, #as_range, #base_value, #decoded_value, #encoding, #encoding?, #end?, format_date, from_cocina, #inferred?, #initialize, #parsable?, parse_date, #parsed_date?, #precision, #primary?, #qualified?, #qualified_value, #qualifier, #questionable?, #sort_key, #start?, #to_a, #value

Constructor Details

This class inherits a constructor from CocinaDisplay::Dates::Date

Class Method Details

.normalize_to_edtf(text) ⇒ Object 



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# File 'lib/cocina_display/dates/date.rb', line 553

def self.normalize_to_edtf(text)
  matches = text.match(REGEX)
  roman_to_int(matches[:year].upcase).to_s
end

.roman_to_int(value) ⇒ Object 



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# File 'lib/cocina_display/dates/date.rb', line 558

def self.roman_to_int(value)
  value = value.tr(".", "")
  map = {"M" => 1000, "CM" => 900, "D" => 500, "CD" => 400, "C" => 100, "XC" => 90, "L" => 50, "XL" => 40, "X" => 10, "IX" => 9, "V" => 5, "IV" => 4, "I" => 1}
  result = 0
  map.each do |k, v|
    while value.index(k) == 0
      result += v
      value.slice! k
    end
  end
  result
end