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Added support for Norwegian test numbers #10

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Aug 26, 2024
Merged

Added support for Norwegian test numbers #10

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8 changes: 7 additions & 1 deletion VatValidation/Countries/NO.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,10 @@ namespace VatValidation.Countries;
/// valid, in: 977 074 010MVA, national: 977 074 010, vat: NO 977 074 010, stripped: 977074010, vatstripped: NO 977 074 010
/// valid, in: NO 977 074 010MVA, national: 977 074 010, vat: NO 977 074 010, stripped: 977074010, vatstripped: NO 977 074 010
/// valid, in: NO977074010, national: 977 074 010, vat: NO 977 074 010, stripped: 977074010, vatstripped: NO 977 074 010
/// valid, in: 310033243, national: 310 033 243, vat: NO 310 033 243, stripped: 310033243, comment: test number from skatteetaten.no
/// invalid, in: 310033242, national: 310033242, vat: NO 310033242, stripped: 310033242
/// valid, in: 212409472, national: 212 409 472, vat: NO 212 409 472, stripped: 212409472, comment: test number from skatteetaten.no
/// invalid, in: 212409471, national: 212409471, vat: NO 212409471, stripped: 212409471
/// </testcases>
public class NO : CountryBase
{
Expand All @@ -31,7 +35,9 @@ private NO() { }
private static readonly int[] _multipliers = [3, 2, 7, 6, 5, 4, 3, 2, 1];

// https://vatstack.com/articles/norway-vat-number-validation
private static bool ValidFormat(ReadOnlySpan<int> d) => d.Length == 9 && (d[0] == 8 || d[0] == 9);
private static bool ValidFormat(ReadOnlySpan<int> d) => d.Length == 9 && (
d[0] == 2 || d[0] == 3 ||
d[0] == 8 || d[0] == 9);
internal static bool Valid(ReadOnlySpan<int> digits) => ValidFormat(digits) && Valid(digits.ToArray());
private static bool Valid(int[] digits) =>
(11 - digits
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