Upped Dart version, switched to extension methods

lib/models/train_data.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 
 import 'package:flutter/widgets.dart';
 import 'package:info_tren/hidden_webview.dart';
+import 'package:info_tren/utils/string.dart';
 import 'package:info_tren/utils/webview_invoke.dart';
 import 'package:json_annotation/json_annotation.dart';
 import 'package:webview_flutter/webview_flutter.dart';
@@ -194,7 +195,7 @@ class OnDemandTrainData extends OnDemand {
       isFunctionAlready: true,
     )).trim();
 
-    return takeWhile(result, (char) => char != ' '.codeUnitAt(0));
+    return result.takeWhile((char) => char != ' '.codeUnitAt(0));
   }
 
   Future<String> get _routeDuration async {
@@ -1064,14 +1065,3 @@ DateTime parseCFRDateTime(String dateAndTime) {
 
   return DateTime(year, month, day, hour, minute);
 }
-
-String takeWhile(String input, Function charValidator) {
-  StringBuffer output = StringBuffer();
-
-  for (final char in input.codeUnits) {
-    if (charValidator(char)) output.writeCharCode(char);
-    else break;
-  }
-
-  return output.toString();
-}

lib/utils/string.dart

@@ -0,0 +1,12 @@
+extension TakeWhile on String {
+  String takeWhile(Function charValidator) {
+    StringBuffer output = StringBuffer();
+
+    for (final char in this.codeUnits) {
+      if (charValidator(char)) output.writeCharCode(char);
+      else break;
+    }
+
+    return output.toString();
+  }
+}

pubspec.yaml

@@ -1,5 +1,5 @@
 name: info_tren
-description: O aplicație de vizualizare a datelor puse la dispoziție de Informatica Feroviară.xe
+description: O aplicație de vizualizare a datelor puse la dispoziție de Informatica Feroviară.
 
 # The following defines the version and build number for your application.
 # A version number is three numbers separated by dots, like 1.2.43
@@ -14,7 +14,7 @@ description: O aplicație de vizualizare a datelor puse la dispoziție de Inform
 version: 2.0.6
 
 environment:
-  sdk: ">=2.3.0 <3.0.0"
+  sdk: ">=2.7.0 <3.0.0"
 
 dependencies:
   flutter: