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* NIF of a legal person or entity, formerly CIF (Código de Identificación Fiscal): the tax
* ID of companies, associations, public bodies and other entities.
*
* Format:
* - CIF-1: organisation key + 7 digits + a control character: `A58818501`
* (Orden EHA/451/2008 art. 2; RD 1065/2007 art. 22.1).
* - CIF-2: the keys are A B C D E F G H J N P Q R S U V W (Orden
* EHA/451/2008 arts. 3-5). K L M X Y Z are natural persons, never entities.
* - CIF-5: the 7 digits are random since 2008, so no province code check.
*
* Control character:
* - CIF-4 (convention, no official text): add the digits in even positions
* (2, 4, 6); double each digit in odd positions (1, 3, 5, 7) and add the
* digits of the result; control = (10 - total mod 10) mod 10.
* - CIF-3 (AEAT D.I.T. 2008): the key decides the type. A B C D E F G H J
* U V take the digit; N P Q R S W take the letter `JABCDEFGHI`[control].
* The opt-in `cifControl: "lenient"` lets C D F G J U V take either, as
* v1 did (legacy data, no official basis; #38).
* - NORM-1: lower-case ASCII letters are accepted too (convention).
*
* Rule IDs refer to SPEC.md.
*/
import {
isFrom0x30To0x7F,
isNineCharsFrom0x30,
isWhiteSpace,
normalize,
removeSeparators,
} from "./normalize";
import { isLenientCif, NO_OPTIONS, toUpperAsciiLetter } from "./shared";
import type { IsValidOptions } from "./types";
/**
* The control letters of a NIF of a legal person or entity (CIF): the control
* digit 0 is `J`, 1 is `A`, 2 is `B`, and so on up to 9, which is `I`
* (CIF-3). Only the keys N P Q R S W take the letter; the others take the
* digit.
* @example
* LEGAL_ENTITY_CONTROL_LETTERS[4]; // "D" (the letter that stands for the control digit 4)
* LEGAL_ENTITY_CONTROL_LETTERS.length; // 10
* @example
* LEGAL_ENTITY_CONTROL_LETTERS.indexOf("B"); // 2: a control letter B stands for the digit 2
* LEGAL_ENTITY_CONTROL_LETTERS.includes("Z"); // false: Z is never a control letter
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-3 SPEC.md#cif-3}
* @since 1.0.0
*/
export const LEGAL_ENTITY_CONTROL_LETTERS = "JABCDEFGHI";
/**
* Pattern of the NIF of a legal person or entity (CIF): an organisation key, 7
* digits and a digit or a letter from A to J. It does not check the control
* code.
*
* Kept as a public constant for v1 compatibility; the validators below don't
* use it. Use `isValidLegalEntityNif` to validate a NIF: it also checks the
* control character, and CIF-3 says which keys take a letter.
* @example
* LEGAL_ENTITY_NIF_REGEX.test("B12345674"); // true
* LEGAL_ENTITY_NIF_REGEX.test("b1234567d"); // true: the pattern takes a letter for any key
* @example
* LEGAL_ENTITY_NIF_REGEX.test("K12345674"); // false: K is not an organisation key (CIF-2)
* LEGAL_ENTITY_NIF_REGEX.test("B1234567"); // false: the control character is missing (CIF-1)
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-1 SPEC.md#cif-1}
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-2 SPEC.md#cif-2}
* @since 1.0.0
*/
export const LEGAL_ENTITY_NIF_REGEX = /^[ABCDEFGHJNPQRSUVW][\d]{7}[\dA-J]$/i;
const CIF_LENGTH = 9;
// CIF-3 (AEAT D.I.T. 2008): the control type depends only on the
// organisation key. There is no "number starts with 00" rule.
export const NOT_A_KEY = 0;
/** A B E H: digit control, in both modes. */
const DIGIT_CONTROL = 1;
/** N P Q R S W: letter control, in both modes. */
export const LETTER_CONTROL = 2;
/**
* C D F G J U V: digit control (CIF-3), or either a letter or a digit with
* `cifControl: "lenient"`.
*/
export const LENIENT_KEY_CONTROL = 3;
/**
* Control type of each letter from A to Z as a digit: `NOT_A_KEY` (0) for
* I K L M O T X Y Z, else DIGIT_CONTROL (1), LETTER_CONTROL (2) or
* LENIENT_KEY_CONTROL (3). A string, unlike a typed array, needs no code to
* fill it when the module loads.
*/
// ABCDEFGHIJKLMNOPQRSTUVWXYZ
const KEY_KINDS = "11331331030002022220332000";
/**
* CIF-2: control type of the organisation key with this UTF-16 code, or
* `NOT_A_KEY`. Internal helper.
*/
export function cifKeyKind(code: number): number {
// NORM-1: either case. `code | 32` maps A-Z to a-z, and only letters
// land in a-z.
const index = (code | 32) - 97;
return index >>> 0 < 26 ? KEY_KINDS.charCodeAt(index) - 48 : NOT_A_KEY;
}
/** CIF-4: sum of the digits of `2 * digit`, by digit. */
const DOUBLED_DIGIT_SUM = [0, 2, 4, 6, 8, 1, 3, 5, 7, 9];
/**
* CIF-4: the control value (0-9) of the 7 digits of `nif` at indexes 1 to 7,
* or -1 if one of them is not an ASCII digit (CIF-1). Internal helper.
*/
export function cifControlValue(nif: string): number {
let sum = 0;
for (let i = 1; i < 8; i++) {
const digit = nif.charCodeAt(i) - 48;
// CIF-1: 7 ASCII digits.
if (digit >>> 0 > 9) return -1;
// CIF-4: the digits in odd positions of the number (1, 3, 5, 7, which
// are also the odd string indexes) are doubled and the digits of the
// result added; the digits in even positions (2, 4, 6) are added as is.
sum += i & 1 ? (DOUBLED_DIGIT_SUM[digit] as number) : digit;
}
// CIF-4: control = (10 - sum mod 10) mod 10.
return (10 - (sum % 10)) % 10;
}
/**
* CIF-3: does the control character with UTF-16 code `code` match the
* computed `control` (0-9) for this key kind?
*/
function matchesControl(
kind: number,
code: number,
control: number,
opts: IsValidOptions | null
): boolean {
// CIF-3: N P Q R S W take the letter JABCDEFGHI[control] (NORM-1: either
// case).
if (kind === LETTER_CONTROL)
return (
toUpperAsciiLetter(code) ===
LEGAL_ENTITY_CONTROL_LETTERS.charCodeAt(control)
);
// CIF-3: A B C D E F G H J U V take the digit.
if (code - 48 === control) return true;
// cifControl: "lenient" (#38): C D F G J U V may take the letter too.
return (
kind === LENIENT_KEY_CONTROL &&
isLenientCif(opts) &&
toUpperAsciiLetter(code) ===
LEGAL_ENTITY_CONTROL_LETTERS.charCodeAt(control)
);
}
/**
* Checks, in one pass and without allocating, the 7 digits (CIF-1) and the
* control character (CIF-3, CIF-4) of a 9-character NIF of a legal person or entity whose
* organisation key has the given kind. Internal helper; the caller checks
* the length and the key.
*/
export function hasValidCifDigitsAndControl(
nif: string,
kind: number,
opts: IsValidOptions | null
): boolean {
const control = cifControlValue(nif);
return control >= 0 && matchesControl(kind, nif.charCodeAt(8), control, opts);
}
/**
* v1 semantics of `+char` for one UTF-16 code unit: the digit's value, 0 for
* the white space and line terminators that `Number()` trims, and -1 (v1's
* `NaN`) for anything else.
*/
function looseDigitValue(code: number): number {
const digit = code - 48;
if (digit >>> 0 < 10) return digit;
// `Number()` trims exactly JavaScript's white space.
return isWhiteSpace(code) ? 0 : -1;
}
function isAscii(value: string): boolean {
for (let i = 0; i < value.length; i++)
if (value.charCodeAt(i) > 0x7f) return false;
return true;
}
/**
* v1's control code check, which reads the characters of `value` wherever
* they are and whatever they are. `value` is ASCII or already upper case.
*/
function hasLooseControlCode(
value: string,
opts: IsValidOptions | null
): boolean {
const last = value.length - 1;
// v1 read the 7 digits from `value.slice(1, -1)`. A missing or non-numeric
// one made the sum NaN, and no control matches NaN.
let sum = 0;
for (let i = 1; i < 8; i++) {
const digit = i < last ? looseDigitValue(value.charCodeAt(i)) : -1;
if (digit < 0) return false;
// CIF-4, as in cifControlValue.
sum += i & 1 ? (DOUBLED_DIGIT_SUM[digit] as number) : digit;
}
const control = (10 - (sum % 10)) % 10;
const kind = cifKeyKind(value.charCodeAt(0));
const code = value.charCodeAt(last);
const letter = LEGAL_ENTITY_CONTROL_LETTERS.charCodeAt(control);
// CIF-3: letter control.
if (kind === LETTER_CONTROL) return toUpperAsciiLetter(code) === letter;
const controlDigit = looseDigitValue(code);
// CIF-3: digit control. In "official" mode C D F G J U V too.
const lenient = isLenientCif(opts);
if (kind === DIGIT_CONTROL || (kind === LENIENT_KEY_CONTROL && !lenient))
return controlDigit === control;
// CIF-3: without an organisation key there is no official control type.
if (!lenient) return false;
// cifControl: "lenient" (#38): C D F G J U V, and, as in v1, any first
// character that is not a key, take a letter or a digit.
return controlDigit < 0
? toUpperAsciiLetter(code) === letter
: controlDigit === control;
}
/**
* Checks the control character (letter or digit) of a NIF of a legal person
* or entity, formerly CIF, without checking its format.
*
* **It does not check the format** (`LEGAL_ENTITY_NIF_REGEX`): it only reads
* the organisation key, the 7 digits and the last character.
*
* With the default `cifControl: "official"`, the organisation key decides
* whether the control is a digit or a letter (CIF-3), and a first character
* that is not an organisation key gives `false`. `cifControl: "lenient"`
* keeps the v1 behaviour: C D F G J U V, and any first character that is
* not a key, accept either.
*
* The input is normalized first (NORM-1 to NORM-3); pass
* `{ normalize: false }` to read it as v1 did (where, for example, a space
* in a digit position counted as 0).
*
* Never throws, whatever the length of the string. Any value that is not a
* string (e.g. `null`) returns `false`.
* @param value The value to check: an organisation key, 7 digits and a
* control character, for example `B12345674`.
* @param opts `normalize` (default `true`), `cifControl` (default
* `"official"`). See {@link IsValidOptions}.
* @returns `true` if the last character is the control character (CIF-4) of
* the right class for the organisation key (CIF-3), or a letter or a digit
* for C D F G J U V with `cifControl: "lenient"`. `false` otherwise, and for
* any value that is not a string.
* @example
* isValidLegalEntityNifControlCode("B12345674"); // true (B takes the digit 4)
* isValidLegalEntityNifControlCode("P2807900B"); // true (P takes the letter B)
* isValidLegalEntityNifControlCode("G1234567D", { cifControl: "lenient" }); // true, as in v1
* @example
* isValidLegalEntityNifControlCode("B12345670"); // false: the control digit should be 4 (CIF-4)
* isValidLegalEntityNifControlCode("P28079004"); // false: P takes a letter (CIF-3)
* isValidLegalEntityNifControlCode("G1234567D"); // false: G takes a digit (CIF-3), unless lenient
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-3 SPEC.md#cif-3}
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-4 SPEC.md#cif-4}
* @since 1.0.0
*/
export function isValidLegalEntityNifControlCode(
value: unknown,
opts: IsValidOptions = NO_OPTIONS
): boolean {
if (typeof value !== "string") return false;
// NORM-1..4. A 9-character value in 0x30-0x7F is ASCII, has no
// separator, and normalizing it only upper-cases, which the check does
// anyway: the fast path.
if (opts?.normalize !== false && isNineCharsFrom0x30(value))
return hasLooseControlCode(value, opts);
const legalEntityNif = opts?.normalize === false ? value : normalize(value);
// NORM-1: v1 upper-cased the whole string first. For ASCII that only
// changes a-z, which the checks fold one character at a time. Other
// characters can change length ("ß" -> "SS", "ffi" -> "FFI") and move the
// positions, so only then is the upper-cased copy built.
return hasLooseControlCode(
isAscii(legalEntityNif) ? legalEntityNif : legalEntityNif.toUpperCase(),
opts
);
}
/**
* Checks that a value is a valid NIF of a legal person or entity, formerly
* CIF: an organisation key, 7 digits and a control character.
*
* The control character follows CIF-3 by default: a digit for A B C D E F G
* H J U V and a letter for N P Q R S W. Pass `{ cifControl: "lenient" }` to
* also accept a letter for C D F G J U V, as v1 did.
*
* The input is normalized first (NORM-1 to NORM-3), so `" b-1234567-4 "`
* is valid. Pass `{ normalize: false }` for v1's strict parsing.
*
* It does not include the old K, L and M formats: those are natural persons.
* Never throws: any value that is not a string (e.g. `null`) returns `false`.
* @param legalEntityNif The value to check: an organisation key (A B C D E F G
* H J N P Q R S U V W), 7 digits and a control character, in either case, with
* or without separators.
* @param opts `normalize` (default `true`), `cifControl` (default
* `"official"`). See {@link IsValidOptions}.
* @returns `true` if the value is a NIF of a legal person or entity with a
* valid organisation key and the right control character, after normalizing
* it unless `normalize` is `false`. `false` for anything else: a DNI or a
* NIE, the wrong control character or class, and any value that is not a
* string.
* @example
* isValidLegalEntityNif("B12345674"); // true
* isValidLegalEntityNif(" b-1234567-4 "); // true (lower case with separators)
* isValidLegalEntityNif("G1234567D", { cifControl: "lenient" }); // true, as in v1
* @example
* isValidLegalEntityNif("B12345670"); // false: the control digit should be 4 (CIF-4)
* isValidLegalEntityNif("G1234567D"); // false: G takes a digit, not a letter (CIF-3)
* isValidLegalEntityNif("12345678Z"); // false: a DNI is not a NIF of a legal person
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-3 SPEC.md#cif-3}
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#norm-2 SPEC.md#norm-2}
* @since 1.0.0
*/
export function isValidLegalEntityNif(
legalEntityNif: unknown,
opts: IsValidOptions = NO_OPTIONS
): boolean {
if (typeof legalEntityNif !== "string") return false;
if (checkCif(legalEntityNif, opts)) return true;
// Cleanup only shortens a value (NORM-4 pads DNIs only), so a failed
// value of 9 characters or fewer stays invalid.
return legalEntityNif.length > CIF_LENGTH && retryCif(legalEntityNif, opts);
}
/**
* NORM-2 / NORM-3: the slow path of isValidLegalEntityNif, in its own
* function so the fast path stays small.
*/
function retryCif(value: string, opts: IsValidOptions | null): boolean {
if (opts?.normalize === false) return false;
// A first character in 0x30-0x7F is no separator, so it stays first: if
// it isn't an organisation key, there's nothing to scan (CIF-2).
const first = value.charCodeAt(0);
if (isFrom0x30To0x7F(first) && cifKeyKind(first) === NOT_A_KEY) return false;
return checkCif(removeSeparators(value), opts);
}
/** NIF of a legal person or entity (CIF), on the raw string. */
function checkCif(value: string, opts: IsValidOptions | null): boolean {
// CIF-1: 9 characters.
if (value.length !== CIF_LENGTH) return false;
// CIF-2: a valid organisation key (NORM-1: either case).
const kind = cifKeyKind(value.charCodeAt(0));
return kind !== NOT_A_KEY && hasValidCifDigitsAndControl(value, kind, opts);
}
/**
* Checks that a value is a valid NIF of a legal person or entity, formerly
* CIF: an organisation key, 7 digits and a control character. Alias of
* `isValidLegalEntityNif`: the same function, under the name v1 also
* exported.
*
* The control character follows CIF-3 by default: a digit for A B C D E F G
* H J U V and a letter for N P Q R S W. Pass `{ cifControl: "lenient" }` to
* also accept a letter for C D F G J U V, as v1 did.
*
* The input is normalized first (NORM-1 to NORM-3), so `" b-1234567-4 "`
* is valid. Pass `{ normalize: false }` for v1's strict parsing.
*
* It does not include the old K, L and M formats: those are natural persons.
* Never throws: any value that is not a string (e.g. `null`) returns `false`.
* @param legalEntityNif The value to check: an organisation key (A B C D E F G
* H J N P Q R S U V W), 7 digits and a control character, in either case, with
* or without separators.
* @param opts `normalize` (default `true`), `cifControl` (default
* `"official"`). See {@link IsValidOptions}.
* @returns `true` if the value is a NIF of a legal person or entity with a
* valid organisation key and the right control character, after normalizing
* it unless `normalize` is `false`. `false` for anything else: a DNI or a
* NIE, the wrong control character or class, and any value that is not a
* string.
* @example
* isValidCif("B12345674"); // true
* isValidCif(" b-1234567-4 "); // true (lower case with separators)
* isValidCif("G1234567D", { cifControl: "lenient" }); // true, as in v1
* @example
* isValidCif("B12345670"); // false: the control digit should be 4 (CIF-4)
* isValidCif("G1234567D"); // false: G takes a digit, not a letter (CIF-3)
* isValidCif("12345678Z"); // false: a DNI is not a NIF of a legal person
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-3 SPEC.md#cif-3}
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#norm-2 SPEC.md#norm-2}
* @since 1.0.0
*/
export const isValidCif: typeof isValidLegalEntityNif = isValidLegalEntityNif;
/**
* Checks the control character (letter or digit) of a NIF of a legal person
* or entity, formerly CIF, without checking its format. Alias of
* `isValidLegalEntityNifControlCode`: the same function, under the name v1
* also exported.
*
* **It does not check the format** (`LEGAL_ENTITY_NIF_REGEX`): it only reads
* the organisation key, the 7 digits and the last character.
*
* With the default `cifControl: "official"`, the organisation key decides
* whether the control is a digit or a letter (CIF-3), and a first character
* that is not an organisation key gives `false`. `cifControl: "lenient"`
* keeps the v1 behaviour: C D F G J U V, and any first character that is
* not a key, accept either.
*
* The input is normalized first (NORM-1 to NORM-3); pass
* `{ normalize: false }` to read it as v1 did (where, for example, a space
* in a digit position counted as 0).
*
* Never throws, whatever the length of the string. Any value that is not a
* string (e.g. `null`) returns `false`.
* @param value The value to check: an organisation key, 7 digits and a
* control character, for example `B12345674`.
* @param opts `normalize` (default `true`), `cifControl` (default
* `"official"`). See {@link IsValidOptions}.
* @returns `true` if the last character is the control character (CIF-4) of
* the right class for the organisation key (CIF-3), or a letter or a digit
* for C D F G J U V with `cifControl: "lenient"`. `false` otherwise, and for
* any value that is not a string.
* @example
* isValidCifControlCode("B12345674"); // true (B takes the digit 4)
* isValidCifControlCode("P2807900B"); // true (P takes the letter B)
* isValidCifControlCode("G1234567D", { cifControl: "lenient" }); // true, as in v1
* @example
* isValidCifControlCode("B12345670"); // false: the control digit should be 4 (CIF-4)
* isValidCifControlCode("P28079004"); // false: P takes a letter (CIF-3)
* isValidCifControlCode("G1234567D"); // false: G takes a digit (CIF-3), unless lenient
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-3 SPEC.md#cif-3}
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-4 SPEC.md#cif-4}
* @since 1.0.0
*/
export const isValidCifControlCode: typeof isValidLegalEntityNifControlCode =
isValidLegalEntityNifControlCode;
/**
* The control letters of a NIF of a legal person or entity (CIF): the control
* digit 0 is `J`, 1 is `A`, 2 is `B`, and so on up to 9, which is `I`
* (CIF-3). Only the keys N P Q R S W take the letter; the others take the
* digit.
*
* Alias of `LEGAL_ENTITY_CONTROL_LETTERS`: the same value, under the name v1
* also exported.
* @example
* CIF_CONTROL_LETTERS[4]; // "D" (the letter that stands for the control digit 4)
* CIF_CONTROL_LETTERS.length; // 10
* @example
* CIF_CONTROL_LETTERS.indexOf("B"); // 2: a control letter B stands for the digit 2
* CIF_CONTROL_LETTERS.includes("Z"); // false: Z is never a control letter
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-3 SPEC.md#cif-3}
* @since 1.0.0
*/
export const CIF_CONTROL_LETTERS: typeof LEGAL_ENTITY_CONTROL_LETTERS =
LEGAL_ENTITY_CONTROL_LETTERS;
/**
* Pattern of the NIF of a legal person or entity (CIF): an organisation key, 7
* digits and a digit or a letter from A to J. It does not check the control
* code.
*
* Alias of `LEGAL_ENTITY_NIF_REGEX`: the same pattern, under the name v1 also
* exported.
*
* Kept as a public constant for v1 compatibility; the validators below don't
* use it. Use `isValidLegalEntityNif` to validate a NIF: it also checks the
* control character, and CIF-3 says which keys take a letter.
* @example
* CIF_REGEX.test("B12345674"); // true
* CIF_REGEX.test("b1234567d"); // true: the pattern takes a letter for any key
* @example
* CIF_REGEX.test("K12345674"); // false: K is not an organisation key (CIF-2)
* CIF_REGEX.test("B1234567"); // false: the control character is missing (CIF-1)
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-1 SPEC.md#cif-1}
* @see {@link https://github.com/josegoval/nif-dni-nie-cif-validation/blob/master/SPEC.md#cif-2 SPEC.md#cif-2}
* @since 1.0.0
*/
export const CIF_REGEX: typeof LEGAL_ENTITY_NIF_REGEX = LEGAL_ENTITY_NIF_REGEX;
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