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55 lines
2.1 KiB
55 lines
2.1 KiB
3 years ago
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import { parseDigit } from './helpers/parseDigits.js'
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/**
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* Parses phone number characters from a string.
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* Drops all punctuation leaving only digits and the leading `+` sign (if any).
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* Also converts wide-ascii and arabic-indic numerals to conventional numerals.
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* E.g. in Iraq they don't write `+442323234` but rather `+٤٤٢٣٢٣٢٣٤`.
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* @param {string} string
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* @return {string}
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* @example
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* ```js
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* // Outputs '8800555'.
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* parseIncompletePhoneNumber('8 (800) 555')
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* // Outputs '+7800555'.
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* parseIncompletePhoneNumber('+7 800 555')
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* ```
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*/
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export default function parseIncompletePhoneNumber(string) {
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let result = ''
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// Using `.split('')` here instead of normal `for ... of`
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// because the importing application doesn't neccessarily include an ES6 polyfill.
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// The `.split('')` approach discards "exotic" UTF-8 characters
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// (the ones consisting of four bytes) but digits
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// (including non-European ones) don't fall into that range
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// so such "exotic" characters would be discarded anyway.
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for (const character of string.split('')) {
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result += parsePhoneNumberCharacter(character, result) || ''
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}
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return result
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}
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/**
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* Parses next character while parsing phone number digits (including a `+`)
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* from text: discards everything except `+` and digits, and `+` is only allowed
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* at the start of a phone number.
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* For example, is used in `react-phone-number-input` where it uses
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* [`input-format`](https://gitlab.com/catamphetamine/input-format).
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* @param {string} character - Yet another character from raw input string.
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* @param {string?} prevParsedCharacters - Previous parsed characters.
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* @param {object} meta - Optional custom use-case-specific metadata.
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* @return {string?} The parsed character.
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*/
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export function parsePhoneNumberCharacter(character, prevParsedCharacters) {
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// Only allow a leading `+`.
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if (character === '+') {
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// If this `+` is not the first parsed character
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// then discard it.
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if (prevParsedCharacters) {
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return
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}
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return '+'
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}
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// Allow digits.
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return parseDigit(character)
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}
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