Class: NumberPlateValidator::SGValidator

Inherits:
CountryValidatorBase show all
Defined in:
lib/number_plate_validator/sg_validator.rb

Constant Summary collapse

CHECK_SUM = 
{ 0 => "A", 1 => "Z", 2 => "Y", 3 => "X", 4 => "U", 5 => "T", 6 => "S", 7 => "R", 8 => "P", 9 => "M", 10 => "L", 11 => "K", 12 => "J", 13 => "H", 14 => "G", 15 => "E", 16 => "D", 17 => "C", 18 => "B" }
MULTIPLIER = 
[9, 4, 5, 4, 3, 2]

Instance Attribute Summary

Attributes inherited from CountryValidatorBase

#country

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SGValidator

Returns a new instance of SGValidator.



6
7
8
 
# File 'lib/number_plate_validator/sg_validator.rb', line 6

def initialize
    @country = "SG"
end

Instance Method Details

#get_checksum(letters, numerals) ⇒ Object 



22
23
24
25
 
# File 'lib/number_plate_validator/sg_validator.rb', line 22

def get_checksum(letters, numerals)
	numbers = get_numbers(letters, numerals)
	get_checksum_from_numbers(numbers)
end

#get_checksum_from_numbers(numbers) ⇒ Object 



43
44
45
46
47
48
 
# File 'lib/number_plate_validator/sg_validator.rb', line 43

def get_checksum_from_numbers(numbers)
	checksum_array = []
	numbers.zip(MULTIPLIER) { |x, y| checksum_array << (x * y) }
	checksum_key = checksum_array.reduce(:+) % 19
	CHECK_SUM[checksum_key]
end

#get_numbers(letters, numerals) ⇒ Object 



27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/number_plate_validator/sg_validator.rb', line 27

def get_numbers(letters, numerals)
	numbers = []
	letters.split(//).each do |alphebat|
		numbers << (alphebat.ord - 64)
	end

	if numbers.length == 3
		numbers = numbers[1,2]
	elsif numbers.length == 1
		numbers = [1] + numbers
	end

	numerals = ("000" + numerals)[-4,4]
	numbers + numerals.split(//).map(&:to_i)
end

#is_valid?(registration_number) ⇒ Boolean

Returns:

  • (Boolean) 


10
11
12
13
14
15
16
17
18
19
20
 
# File 'lib/number_plate_validator/sg_validator.rb', line 10

def is_valid?(registration_number)
	return false unless super
	return false if @license.length > 8 || @license.length < 4
	test = /^[A-Z]{1,3}[1-9]{1}\d{0,3}[A-Z]$/ =~ @license
	return false unless test == 0
	letters = @license[/[A-Z]+/]
	numerals = @license[/\d+/]

	checksum = get_checksum(letters, numerals)
	checksum == @license[-1]
end