app/lib/document_parser.rb
module DocumentParser
def get_document_number_variants(document_type, document_number)
return [] if document_number.blank?
# Delete all non-alphanumerics
document_number = document_number.to_s.gsub(/[^0-9A-Za-z]/i, "")
variants = []
if dni?(document_type)
document_number, letter = split_letter_from(document_number)
number_variants = get_number_variants_with_leading_zeroes_from(document_number)
letter_variants = get_letter_variants(number_variants, letter)
variants += number_variants
variants += letter_variants
else # if not a DNI, just use the document_number, with no variants
variants << document_number
end
variants
end
def split_letter_from(document_number)
letter = document_number.last
if letter[/[A-Za-z]/] == letter
document_number = document_number[0..-2]
else
letter = nil
end
[document_number, letter]
end
# if the number has less digits than it should, pad with zeros to the left and add each variant to the list
# For example, if the initial document_number is 1234, and digits=8, the result is
# ['1234', '01234', '001234', '0001234']
def get_number_variants_with_leading_zeroes_from(document_number, digits = 8)
document_number = document_number.to_s.last(digits) # Keep only the last x digits
document_number = document_number.gsub(/^0+/, "") # Removes leading zeros
variants = []
variants << document_number if document_number.present?
while document_number.size < digits
document_number = "0#{document_number}"
variants << document_number
end
variants
end
# Generates uppercase and lowercase variants of a series of numbers, if the letter is present
# If number_variants == ['1234', '01234'] & letter == 'A', the result is
# ['1234a', '1234A', '01234a', '01234A']
def get_letter_variants(number_variants, letter)
variants = []
if letter.present?
number_variants.each do |number|
variants << number + letter.downcase << number + letter.upcase
end
end
variants
end
def dni?(document_type)
document_type.to_s == "1"
end
end