Parsing a locale decimal number

locale_number_parsing.swift

  func testFoundationDouble() {
    let locales: [Locale] = [Locale(identifier: "en_US"), Locale(identifier: "de_DE"), Locale(identifier: "es_AR"), Locale(identifier: "es_ES"), Locale(identifier: "es_MX"), Locale(identifier: "fr_FR")]
    let numbers: [Double] = [0.01, 0.1, 1, 1_100.10, 100_000_000]
    
    for locale in locales {
      let nf = NumberFormatter()
      nf.locale = locale
      nf.groupingSize = 3
      nf.usesGroupingSeparator = true
      nf.minimumSignificantDigits = 2
      
      print("locale: \(locale.identifier)")
      for number in numbers {
        
        print("input number: \(number)")
        let ns_number = NSNumber(value: number)
        if let str = nf.string(from: ns_number) {
          print(" - locale formatted str: \(str)")
          if let parsedDouble = nf.number(from: str) {
            // parsedDouble and the original input value should be equal
            print(" - round trip double: \(parsedDouble)")
            XCTAssertEqual(ns_number, parsedDouble, "numbers must be equal. original: \(number), String: \(str) converted: \(parsedDouble), locale: \(locale.identifier)")
          }
        }
      }
      
      print("\n\n")
    }
    
  }

output.txt

locale: en_US
input number: 0.01
 - locale formatted str: 0.010
 - round trip double: 0.01
input number: 0.1
 - locale formatted str: 0.10
 - round trip double: 0.1
input number: 1.0
 - locale formatted str: 1.0
 - round trip double: 1
input number: 1100.1
 - locale formatted str: 1,100.1
 - round trip double: 1100.1
input number: 100000000.0
 - locale formatted str: 100,000,000
 - round trip double: 100000000



locale: de_DE
input number: 0.01
 - locale formatted str: 0,010
 - round trip double: 0.01
input number: 0.1
 - locale formatted str: 0,10
 - round trip double: 0.1
input number: 1.0
 - locale formatted str: 1,0
 - round trip double: 1
input number: 1100.1
 - locale formatted str: 1.100,1
 - round trip double: 1100.1
input number: 100000000.0
 - locale formatted str: 100.000.000
 - round trip double: 100000000



locale: es_AR
input number: 0.01
 - locale formatted str: 0,010
 - round trip double: 0.01
input number: 0.1
 - locale formatted str: 0,10
 - round trip double: 0.1
input number: 1.0
 - locale formatted str: 1,0
 - round trip double: 1
input number: 1100.1
 - locale formatted str: 1.100,1
 - round trip double: 1100.1
input number: 100000000.0
 - locale formatted str: 100.000.000
 - round trip double: 100000000



locale: es_ES
input number: 0.01
 - locale formatted str: 0,010
 - round trip double: 0.01
input number: 0.1
 - locale formatted str: 0,10
 - round trip double: 0.1
input number: 1.0
 - locale formatted str: 1,0
 - round trip double: 1
input number: 1100.1
 - locale formatted str: 1100,1
 - round trip double: 1100.1
input number: 100000000.0
 - locale formatted str: 100.000.000
 - round trip double: 100000000



locale: es_MX
input number: 0.01
 - locale formatted str: 0.010
 - round trip double: 0.01
input number: 0.1
 - locale formatted str: 0.10
 - round trip double: 0.1
input number: 1.0
 - locale formatted str: 1.0
 - round trip double: 1
input number: 1100.1
 - locale formatted str: 1,100.1
 - round trip double: 1100.1
input number: 100000000.0
 - locale formatted str: 100,000,000
 - round trip double: 100000000



locale: fr_FR
input number: 0.01
 - locale formatted str: 0,010
 - round trip double: 0.01
input number: 0.1
 - locale formatted str: 0,10
 - round trip double: 0.1
input number: 1.0
 - locale formatted str: 1,0
 - round trip double: 1
input number: 1100.1
 - locale formatted str: 1 100,1
 - round trip double: 1100.1
input number: 100000000.0
 - locale formatted str: 100 000 000
 - round trip double: 100000000



Test Case '-[test.Tests testFoundationDouble]' passed (0.005 seconds).