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/*
* This file is part of GNU Taler, ©2022-23 Taler Systems S.A.
* See LICENSE.md
*/
import Foundation
import taler_swift
public struct CurrencyInfo {
let scope: ScopeInfo
let specs: CurrencySpecification
let formatter: CurrencyFormatter
/// returns all characters left from the decimalSeparator
func integerPartStr(_ integerStr: String, decimalSeparator: String) -> String {
if let integerIndex = integerStr.endIndex(of: decimalSeparator) {
// decimalSeparator was found ==> return all characters left of it
return String(integerStr[..<integerIndex])
}
guard let firstChar = integerStr.first else { return "" } // TODO: should NEVER happen! Show error
let digitSet = CharacterSet.decimalDigits
if digitSet.contains(firstChar) {
// Currency Symbol is after the amount ==> return only the digits
return String(integerStr.unicodeScalars.filter { digitSet.contains($0) })
} else {
// Currency Symbol is in front of the amount ==> return everything
return integerStr
}
}
func symbol() -> String? {
if formatter.hasAltUnitName0 {
if let symbol = specs.altUnitNames?[0] {
return symbol
}
}
return nil
}
func string(for valueTuple: (Double, Double), useSymbol: Bool = true) -> String {
formatter.setUseSymbol(useSymbol)
let (integer, fraction) = valueTuple
if let integerStr = formatter.string(for: integer) {
if fraction == 0 { return integerStr } // TODO: add trailing zeroes
if let fractionStr = formatter.string(for: fraction) {
if let decimalSeparator = formatter.currencyDecimalSeparator {
if let fractionIndex = fractionStr.endIndex(of: decimalSeparator) {
var fractionPartStr = String(fractionStr[fractionIndex...])
var resultStr = integerPartStr(integerStr, decimalSeparator: decimalSeparator)
if !resultStr.contains(decimalSeparator) {
resultStr += decimalSeparator
}
// print(resultStr, fractionPartStr)
var fractionCnt = 1
for character in fractionPartStr {
let isSuper = fractionCnt > specs.fractionalNormalDigits
let charStr = String(character)
if let digit = Int(charStr) {
let digitStr = isSuper ? SuperScriptDigits(charStr) : charStr
resultStr += digitStr
if (fractionCnt > 0) { fractionCnt += 1 }
} else {
// probably the Currency Code or Symbol. Just pass it on...
resultStr += charStr
// make sure any following digits (part of the currency name) are not converted to SuperScript
fractionCnt = 0
}
}
// print(resultStr)
return resultStr
}
// if we arrive here then fractionStr doesn't have a decimal separator. Yikes!
}
// if we arrive here then the formatter doesn't have a currencyDecimalSeparator
}
// if we arrive here then we do not get a formatted string for fractionStr. Yikes!
}
// if we arrive here then we do not get a formatted string for integerStr. Yikes!
// TODO: log.error(formatter doesn't work)
// we need to format ourselves
var currencyName = scope.currency
if useSymbol {
if let symbol = symbol() {
currencyName = symbol
}
}
var madeUpStr = currencyName + " " + String(integer)
// let homeCurrency = Locale.current.currency //'currency' is only available in iOS 16 or newer
madeUpStr += Locale.current.decimalSeparator ?? "." // currencyDecimalSeparator
madeUpStr += String(String(fraction).dropFirst()) // remove the leading 0
// TODO: fractionalNormalDigits, fractionalTrailingZeroDigits
return madeUpStr
}
}
public struct CurrencySpecification2: Codable, Sendable {
let currencySpecification: CurrencySpecification
}
public struct CurrencySpecification: Codable, Sendable {
enum CodingKeys: String, CodingKey {
case name = "name"
// case decimalSeparator = "decimal_separator"
// case groupSeparator = "group_separator"
case fractionalInputDigits = "num_fractional_input_digits"
case fractionalNormalDigits = "num_fractional_normal_digits"
case fractionalTrailingZeroDigits = "num_fractional_trailing_zero_digits"
// case isCurrencyNameLeading = "is_currency_name_leading"
case altUnitNames = "alt_unit_names"
}
/// some name for this CurrencySpecification
let name: String
/// e.g. “.” for $, and “,” for €
// let decimalSeparator: String taken from Locale.current
/// e.g. “,” for $, and “.” or “ ” for € (France uses a narrow space character, Hungaria a normal one)
// let groupSeparator: String? taken from Locale.current
/// how much digits the user may enter after the decimal separator
let fractionalInputDigits: Int
/// €,$,£: 2; some arabic currencies: 3, ¥: 0
let fractionalNormalDigits: Int
/// usually same as numFractionalNormalDigits, but e.g. might be 2 for ¥
let fractionalTrailingZeroDigits: Int
/// true for “$ 3.50”; false for “3,50 €”
// let isCurrencyNameLeading: Bool
/// map of powers of 10 to alternative currency names / symbols
/// must always have an entry under "0" that defines the base name
/// e.g. "0 => €" or "3 => k€". For BTC, would be "0 => BTC, -3 => mBTC".
/// This way, we can also communicate the currency symbol to be used.
let altUnitNames: [Int : String]?
}
public class CurrencyFormatter: NumberFormatter {
var hasAltUnitName0: Bool // specs.altUnitNames[0] should have the Symbol ($,€,¥)
/// factory
static func formatter(scope: ScopeInfo, specs: CurrencySpecification) -> CurrencyFormatter {
let formatter = CurrencyFormatter()
formatter.setCode(to: scope.currency)
formatter.setMinimumFractionDigits(specs.fractionalTrailingZeroDigits)
if let symbol = specs.altUnitNames?[0] {
formatter.setSymbol(to: symbol)
formatter.hasAltUnitName0 = true
}
return formatter
}
public override init() {
self.hasAltUnitName0 = false
super.init()
self.locale = Locale.current
self.usesGroupingSeparator = true
self.numberStyle = .currencyISOCode // .currency
self.maximumFractionDigits = 8 // ensure that formatter will not round
// self.currencyCode = code // EUR, USD, JPY, GBP
// self.currencySymbol = symbol
// self.internationalCurrencySymbol =
// self.minimumFractionDigits = fractionDigits
// self.maximumFractionDigits = fractionDigits
// self.groupingSize = 3 // thousands
// self.groupingSeparator = ","
// self.decimalSeparator = "."
}
func setUseSymbol(_ useSymbol: Bool) {
numberStyle = useSymbol ? .currency : .currencyISOCode
}
func setCode(to code:String) {
currencyCode = code
}
func setSymbol(to symbol:String) {
currencySymbol = symbol
}
func setMinimumFractionDigits(_ digits: Int) {
minimumFractionDigits = digits
}
func setLocale(to newLocale: String) {
locale = Locale(identifier: newLocale)
maximumFractionDigits = 8 // ensure that formatter will not round
// NumberFormatter.RoundingMode
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
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