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108 lines
4.3 KiB
108 lines
4.3 KiB
import {
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MIN_LENGTH_FOR_NSN,
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VALID_DIGITS,
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VALID_PUNCTUATION,
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PLUS_CHARS
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} from '../constants.js'
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import createExtensionPattern from './extension/createExtensionPattern.js'
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// Regular expression of viable phone numbers. This is location independent.
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// Checks we have at least three leading digits, and only valid punctuation,
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// alpha characters and digits in the phone number. Does not include extension
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// data. The symbol 'x' is allowed here as valid punctuation since it is often
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// used as a placeholder for carrier codes, for example in Brazilian phone
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// numbers. We also allow multiple '+' characters at the start.
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//
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// Corresponds to the following:
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// [digits]{minLengthNsn}|
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// plus_sign*
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// (([punctuation]|[star])*[digits]){3,}([punctuation]|[star]|[digits]|[alpha])*
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//
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// The first reg-ex is to allow short numbers (two digits long) to be parsed if
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// they are entered as "15" etc, but only if there is no punctuation in them.
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// The second expression restricts the number of digits to three or more, but
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// then allows them to be in international form, and to have alpha-characters
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// and punctuation. We split up the two reg-exes here and combine them when
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// creating the reg-ex VALID_PHONE_NUMBER_PATTERN itself so we can prefix it
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// with ^ and append $ to each branch.
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//
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// "Note VALID_PUNCTUATION starts with a -,
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// so must be the first in the range" (c) Google devs.
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// (wtf did they mean by saying that; probably nothing)
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//
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const MIN_LENGTH_PHONE_NUMBER_PATTERN = '[' + VALID_DIGITS + ']{' + MIN_LENGTH_FOR_NSN + '}'
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//
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// And this is the second reg-exp:
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// (see MIN_LENGTH_PHONE_NUMBER_PATTERN for a full description of this reg-exp)
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//
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export const VALID_PHONE_NUMBER =
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'[' + PLUS_CHARS + ']{0,1}' +
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'(?:' +
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'[' + VALID_PUNCTUATION + ']*' +
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'[' + VALID_DIGITS + ']' +
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'){3,}' +
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'[' +
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VALID_PUNCTUATION +
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VALID_DIGITS +
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']*'
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// This regular expression isn't present in Google's `libphonenumber`
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// and is only used to determine whether the phone number being input
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// is too short for it to even consider it a "valid" number.
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// This is just a way to differentiate between a really invalid phone
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// number like "abcde" and a valid phone number that a user has just
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// started inputting, like "+1" or "1": both these cases would be
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// considered `NOT_A_NUMBER` by Google's `libphonenumber`, but this
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// library can provide a more detailed error message — whether it's
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// really "not a number", or is it just a start of a valid phone number.
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const VALID_PHONE_NUMBER_START_REG_EXP = new RegExp(
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'^' +
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'[' + PLUS_CHARS + ']{0,1}' +
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'(?:' +
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'[' + VALID_PUNCTUATION + ']*' +
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'[' + VALID_DIGITS + ']' +
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'){1,2}' +
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'$'
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, 'i')
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export const VALID_PHONE_NUMBER_WITH_EXTENSION =
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VALID_PHONE_NUMBER +
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// Phone number extensions
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'(?:' + createExtensionPattern() + ')?'
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// The combined regular expression for valid phone numbers:
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//
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const VALID_PHONE_NUMBER_PATTERN = new RegExp(
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// Either a short two-digit-only phone number
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'^' +
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MIN_LENGTH_PHONE_NUMBER_PATTERN +
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'$' +
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'|' +
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// Or a longer fully parsed phone number (min 3 characters)
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'^' +
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VALID_PHONE_NUMBER_WITH_EXTENSION +
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'$'
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, 'i')
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// Checks to see if the string of characters could possibly be a phone number at
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// all. At the moment, checks to see that the string begins with at least 2
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// digits, ignoring any punctuation commonly found in phone numbers. This method
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// does not require the number to be normalized in advance - but does assume
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// that leading non-number symbols have been removed, such as by the method
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// `extract_possible_number`.
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//
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export default function isViablePhoneNumber(number) {
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return number.length >= MIN_LENGTH_FOR_NSN &&
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VALID_PHONE_NUMBER_PATTERN.test(number)
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}
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// This is just a way to differentiate between a really invalid phone
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// number like "abcde" and a valid phone number that a user has just
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// started inputting, like "+1" or "1": both these cases would be
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// considered `NOT_A_NUMBER` by Google's `libphonenumber`, but this
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// library can provide a more detailed error message — whether it's
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// really "not a number", or is it just a start of a valid phone number.
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export function isViablePhoneNumberStart(number) {
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return VALID_PHONE_NUMBER_START_REG_EXP.test(number)
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} |