stdnum
Version:
Standard Number Validation
70 lines • 6.33 kB
JavaScript
import * as exceptions from '../exceptions';
import { isValidDate, strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
return strings.cleanUnicode(input, ' -', 'LV');
}
const impl = {
name: 'Latvian VAT Number',
localName: 'Pievienotās Vērtības Nodokļa',
abbreviation: 'PVN',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
if ('0123'.includes(value[0])) {
return strings.splitAt(value, 6).join('-');
}
return strings.splitAt(value, 4, 8).join(' ');
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 11) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const isIndividual = '0123'.includes(value[0]);
if (isIndividual) {
const [dd, mm, yy, century] = strings.splitAt(value, 2, 4, 6, 7);
if (!isValidDate(`${18 + parseInt(century, 10)}${yy}`, mm, dd, true)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const [front, check] = strings.splitAt(value, -1);
const sum = 1 +
weightedSum(front, {
weights: [10, 5, 8, 4, 2, 1, 6, 3, 7, 9],
modulus: 11,
});
if (String((sum % 11) % 10) !== check) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else {
const sum = weightedSum(value, {
weights: [9, 1, 4, 8, 3, 10, 2, 5, 7, 6, 1],
modulus: 11,
});
if (sum !== 3) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
return {
isValid: true,
compact: value,
isIndividual,
isCompany: !isIndividual,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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