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Viewing file:     parseIncompletePhoneNumber.js (2.07 KB)      -rw-r--r--

import { parseDigit } from './helpers/parseDigits'

/**
 * Parses phone number characters from a string.
 * Drops all punctuation leaving only digits and the leading `+` sign (if any).
 * Also converts wide-ascii and arabic-indic numerals to conventional numerals.
 * E.g. in Iraq they don't write `+442323234` but rather `+٤٤٢٣٢٣٢٣٤`.
 * @param  {string} string
 * @return {string}
 * @example
 * ```js
 * // Outputs '8800555'.
 * parseIncompletePhoneNumber('8 (800) 555')
 * // Outputs '+7800555'.
 * parseIncompletePhoneNumber('+7 800 555')
 * ```
 */
export default function parseIncompletePhoneNumber(string) {
	let result = ''
	// Using `.split('')` here instead of normal `for ... of`
	// because the importing application doesn't neccessarily include an ES6 polyfill.
	// The `.split('')` approach discards "exotic" UTF-8 characters
	// (the ones consisting of four bytes) but digits
	// (including non-European ones) don't fall into that range
	// so such "exotic" characters would be discarded anyway.
	for (const character of string.split('')) {
		result += parsePhoneNumberCharacter(character, result) || ''
	}
	return result
}

/**
 * Parses next character while parsing phone number digits (including a `+`)
 * from text: discards everything except `+` and digits, and `+` is only allowed
 * at the start of a phone number.
 * For example, is used in `react-phone-number-input` where it uses
 * [`input-format`](https://gitlab.com/catamphetamine/input-format).
 * @param  {string} character - Yet another character from raw input string.
 * @param  {string?} prevParsedCharacters - Previous parsed characters.
 * @param  {object} meta - Optional custom use-case-specific metadata.
 * @return {string?} The parsed character.
 */
export function parsePhoneNumberCharacter(character, prevParsedCharacters) {
	// Only allow a leading `+`.
	if (character === '+') {
		// If this `+` is not the first parsed character
		// then discard it.
		if (prevParsedCharacters) {
			return
		}
		return '+'
	}
	// Allow digits.
	return parseDigit(character)
}