Initial commit

lib/utils/ext.dart

@@ -0,0 +1,86 @@
+extension ListExt<T> on List<T>{
+  /// Remove all blank value and return the list.
+  List<T> getNoBlankList(){
+    List<T> newList = [];
+    for(var value in this){
+      if(value.toString() != ""){
+        newList.add(value);
+      }
+    }
+    return newList;
+  }
+
+  T? firstWhereOrNull(bool Function(T element) test){
+    for(var element in this){
+      if(test(element)){
+        return element;
+      }
+    }
+    return null;
+  }
+
+  void addIfNotNull(T? value){
+    if(value != null){
+      add(value);
+    }
+  }
+}
+
+extension StringExt on String{
+  ///Remove all value that would display blank on the screen.
+  String get removeAllBlank => replaceAll("\n", "").replaceAll(" ", "").replaceAll("\t", "");
+
+  /// convert this to a one-element list.
+  List<String> toList() => [this];
+
+  String _nums(){
+    String res = "";
+    for(int i=0; i<length; i++){
+      res += this[i].isNum?this[i]:"";
+    }
+    return res;
+  }
+
+  String get nums => _nums();
+
+  String setValueAt(String value, int index){
+    return replaceRange(index, index+1, value);
+  }
+
+  String? subStringOrNull(int start, [int? end]){
+    if(start < 0 || (end != null && end > length)){
+      return null;
+    }
+    return substring(start, end);
+  }
+
+  String replaceLast(String from, String to) {
+    if (isEmpty || from.isEmpty) {
+      return this;
+    }
+
+    final lastIndex = lastIndexOf(from);
+    if (lastIndex == -1) {
+      return this;
+    }
+
+    final before = substring(0, lastIndex);
+    final after = substring(lastIndex + from.length);
+    return '$before$to$after';
+  }
+
+  static bool hasMatch(String? value, String pattern) {
+    return (value == null) ? false : RegExp(pattern).hasMatch(value);
+  }
+
+  bool _isURL(){
+    final regex = RegExp(
+        r'^((http|https|ftp)://)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&:/~+#-|]*[\w@?^=%&/~+#-])?$',
+        caseSensitive: false);
+    return regex.hasMatch(this);
+  }
+
+  bool get isURL => _isURL();
+
+  bool get isNum => double.tryParse(this) != null;
+}