stdnum
Version:
Standard Number Validation
72 lines • 5.94 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings, weightedSum } from '../util';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -');
if (err !== null) {
return [value, err];
}
if (value.startsWith('SV')) {
return [value.substr(2), err];
}
return [value, err];
}
const impl = {
name: 'El Salvador Tax Number',
localName: 'Número de Identificación Tributaria',
abbreviation: 'NIT',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return strings.splitAt(value, 4, -4, -1).join('-');
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 14) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (!['0', '1', '9'].includes(value[0])) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
let sum;
const [front, check] = strings.splitAt(value, 13);
if (value.substr(10, 3) === '100') {
sum =
weightedSum(front, {
weights: [14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2],
modulus: 11,
}) % 10;
}
else {
sum =
(11 -
weightedSum(front, {
weights: [2, 7, 6, 5, 4, 3, 2, 7, 6, 5, 4, 3, 2],
modulus: 11,
})) %
10;
}
if (check !== String(sum)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: true,
isCompany: true,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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