stdnum
Version:
Standard Number Validation
49 lines • 3.81 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
return strings.cleanUnicode(input, ' -', 'MT');
}
const impl = {
name: 'Maltese VAT Number',
localName: 'Vat Reg. No.',
abbreviation: 'Vat No.',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return strings.splitAt(value, 4).join('-');
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 8) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const sum = weightedSum(value, {
weights: [3, 4, 6, 7, 8, 9, 10, 1],
modulus: 37,
});
if (sum !== 0) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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