Fixed #113

Author: caseyryan

CHANGELOG.md

@@ -1,3 +1,6 @@
+## [2.10.2]
+- Fixed a problem with incorrect card system detection
+- Fixed https://github.com/caseyryan/flutter_multi_formatter/issues/113
 ## [2.10.1]
 - A few fixes to PinyinUtils
 ## [2.10.0]

example/lib/pages/credit_card_format_page.dart

@@ -22,6 +22,11 @@ class _CreditCardFormatPageState extends State<CreditCardFormatPage> {
 
   @override
   Widget build(BuildContext context) {
+    final negativeString = toCurrencyString(
+      '-888',
+      mantissaLength: 2,
+    );
+    print(negativeString);
     return Unfocuser(
       child: Scaffold(
         appBar: AppBar(

example/pubspec.lock

@@ -96,7 +96,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "2.10.1"
+    version: "2.10.2"
   flutter_test:
     dependency: "direct dev"
     description: flutter

lib/formatters/credit_card_number_input_formatter.dart

@@ -230,41 +230,52 @@ class _CardSystemDatas {
   /// рекурсивно ищет в номере карты код системы, начиная с конца
   /// нужно для того, чтобы даже после setState и обнуления данных карты
   /// снова правильно отформатировать ее номер
-  static CardSystemData? getCardSystemDataByNumber(String cardNumber,
-      {int? subscringLength}) {
+  static CardSystemData? getCardSystemDataByNumber(
+    String cardNumber, {
+    int? subscringLength,
+  }) {
     if (cardNumber.isEmpty) return null;
     subscringLength = subscringLength ?? cardNumber.length;
 
     if (subscringLength < 1) return null;
-    var systemCode = cardNumber.substring(0, subscringLength);
-
-    var rawData = _data.firstWhere((Map<String, dynamic>? data) {
-      if (data != null) {
-        var numericValue = toNumericString(data['systemCode']);
-        var numDigits = data['numDigits'];
-        return numericValue == systemCode &&
-            numDigits >= cardNumber.length &&
-            numDigits <= _maxDigitsInCard;
+    Map? rawData;
+    List<Map> tempSystems = [];
+    for (var data in _data) {
+      final systemCode = data['systemCode'];
+      if (cardNumber.startsWith(systemCode)) {
+        tempSystems.add(data);
       }
-      return false;
-    }, orElse: () => null);
-    if (rawData != null) {
-      return CardSystemData.fromMap(rawData);
     }
-    return getCardSystemDataByNumber(
-      cardNumber,
-      subscringLength: subscringLength - 1,
-    );
-  }
+    if (tempSystems.isEmpty) {
+      return null;
+    }
+    if (tempSystems.length == 1) {
+      rawData = tempSystems.first;
+    } else {
+      tempSystems.sort((a, b) => b['systemCode'].compareTo(a['systemCode']));
+      final int maxCodeLength = tempSystems.first['systemCode'].length;
+      tempSystems = tempSystems
+          .where(
+            (e) => e['systemCode'].length == maxCodeLength,
+          )
+          .toList();
 
-  static int get _maxDigitsInCard {
-    return _data.map((data) {
-      int numDigits = data!['numDigits'];
-      return numDigits;
-    }).reduce(max);
+      tempSystems.sort((a, b) => a['systemCode'].compareTo(b['systemCode']));
+      for (var data in tempSystems) {
+        final int numMaskDigits = data['numDigits']!;
+        if (cardNumber.length <= numMaskDigits) {
+          rawData = data;
+          break;
+        }
+      }
+      if (rawData == null) {
+        rawData = tempSystems.last;
+      }
+    }
+    return CardSystemData.fromMap(rawData);
   }
 
-  static List<Map<String, dynamic>?> _data = <Map<String, dynamic>?>[
+  static List<Map<String, dynamic>> _data = <Map<String, dynamic>>[
     {
       'system': CardSystem.VISA,
       'systemCode': '4',
@@ -327,16 +338,16 @@ class _CardSystemDatas {
     },
     {
       'system': CardSystem.JCB,
-      'systemCode': '3589',
-      'numberMask': '0000 0000 0000 0000 000',
-      'numDigits': 19,
-    },
-    {
-      'system': CardSystem.JCB,
-      'systemCode': '3528',
+      'systemCode': '35',
       'numberMask': '0000 0000 0000 0000',
       'numDigits': 16,
     },
+    // {
+    //   'system': CardSystem.JCB,
+    //   'systemCode': '35',
+    //   'numberMask': '0000 0000 0000 0000 000',
+    //   'numDigits': 19,
+    // },
     {
       'system': CardSystem.DISCOVER,
       'systemCode': '60',

lib/formatters/formatter_utils.dart

@@ -499,6 +499,11 @@ String toCurrencyString(
   String trailingSymbol = '',
   bool useSymbolPadding = false,
 }) {
+  bool isNegative = false;
+  if (value.startsWith('-')) {
+    value = value.replaceAll(RegExp(r'^[-+]+'), '');
+    isNegative = true;
+  }
   value = value.replaceAll(_spaceRegex, '');
   if (value.isEmpty) {
     value = '0';
@@ -654,6 +659,9 @@ String toCurrencyString(
     }
   }
   value = sb.toString();
+  if (isNegative) {
+    return '-$value';
+  }
   return value;
 }
 

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_multi_formatter
 description: A package of formatters for international phone numbers, credit / debit cards and a masked formatter
-version: 2.10.1
+version: 2.10.2
 homepage: https://github.com/caseyryan/flutter_multi_formatter
 
 environment: