stdnum
Version:
Standard Number Validation
72 lines • 5.48 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
const weights = {
'0': 1,
'1': 0,
'2': 5,
'3': 7,
'4': 9,
'5': 13,
'6': 15,
'7': 17,
'8': 19,
'9': 21,
};
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -');
if (err !== null) {
return [value, err];
}
if (value.startsWith('CY')) {
return [value.substr(2), null];
}
return [value, null];
}
const impl = {
name: 'Cypriot VAT Number',
localName: 'Αριθμός Εγγραφής Φ.Π.Α.',
abbreviation: 'ΦΠΑ',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return value;
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 9) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
const [front, check] = strings.splitAt(value, -1);
if (!strings.isdigits(front)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (!alphabet.includes(check)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const sum = front
.split('')
.map(v => parseInt(v, 10))
.reduce((acc, v, idx) => acc + (idx % 2 === 0 ? weights[v] : v), 0);
if (alphabet[sum % 26] !== check) {
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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