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Viewing file:     parseDigits.js (2.68 KB)      -rw-r--r--

// These mappings map a character (key) to a specific digit that should
// replace it for normalization purposes. Non-European digits that
// may be used in phone numbers are mapped to a European equivalent.
//
// E.g. in Iraq they don't write `+442323234` but rather `+٤٤٢٣٢٣٢٣٤`.
//
export const DIGITS = {
	'0': '0',
	'1': '1',
	'2': '2',
	'3': '3',
	'4': '4',
	'5': '5',
	'6': '6',
	'7': '7',
	'8': '8',
	'9': '9',
	'\uFF10': '0', // Fullwidth digit 0
	'\uFF11': '1', // Fullwidth digit 1
	'\uFF12': '2', // Fullwidth digit 2
	'\uFF13': '3', // Fullwidth digit 3
	'\uFF14': '4', // Fullwidth digit 4
	'\uFF15': '5', // Fullwidth digit 5
	'\uFF16': '6', // Fullwidth digit 6
	'\uFF17': '7', // Fullwidth digit 7
	'\uFF18': '8', // Fullwidth digit 8
	'\uFF19': '9', // Fullwidth digit 9
	'\u0660': '0', // Arabic-indic digit 0
	'\u0661': '1', // Arabic-indic digit 1
	'\u0662': '2', // Arabic-indic digit 2
	'\u0663': '3', // Arabic-indic digit 3
	'\u0664': '4', // Arabic-indic digit 4
	'\u0665': '5', // Arabic-indic digit 5
	'\u0666': '6', // Arabic-indic digit 6
	'\u0667': '7', // Arabic-indic digit 7
	'\u0668': '8', // Arabic-indic digit 8
	'\u0669': '9', // Arabic-indic digit 9
	'\u06F0': '0', // Eastern-Arabic digit 0
	'\u06F1': '1', // Eastern-Arabic digit 1
	'\u06F2': '2', // Eastern-Arabic digit 2
	'\u06F3': '3', // Eastern-Arabic digit 3
	'\u06F4': '4', // Eastern-Arabic digit 4
	'\u06F5': '5', // Eastern-Arabic digit 5
	'\u06F6': '6', // Eastern-Arabic digit 6
	'\u06F7': '7', // Eastern-Arabic digit 7
	'\u06F8': '8', // Eastern-Arabic digit 8
	'\u06F9': '9'  // Eastern-Arabic digit 9
}

export function parseDigit(character) {
	return DIGITS[character]
}

/**
 * Parses phone number digits from a string.
 * Drops all punctuation leaving only digits.
 * 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
 * parseDigits('8 (800) 555')
 * // Outputs '8800555'.
 * ```
 */
export default function parseDigits(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('')) {
		const digit = parseDigit(character)
		if (digit) {
			result += digit
		}
	}
	return result
}