Verify extensions are working.

Author: tugorez

packages/file_selector/file_selector/lib/file_selector.dart

@@ -14,7 +14,7 @@ Future<XFile> openFile({
   String initialDirectory,
   String confirmButtonText,
 }) {
-  _verifyExtensions(acceptedTypeGroups);
+  acceptedTypeGroups = _verifyTypeGroups(acceptedTypeGroups);
   return FileSelectorPlatform.instance.openFile(
       acceptedTypeGroups: acceptedTypeGroups,
       initialDirectory: initialDirectory,
@@ -27,7 +27,7 @@ Future<List<XFile>> openFiles({
   String initialDirectory,
   String confirmButtonText,
 }) {
-  _verifyExtensions(acceptedTypeGroups);
+  acceptedTypeGroups = _verifyTypeGroups(acceptedTypeGroups);
   return FileSelectorPlatform.instance.openFiles(
       acceptedTypeGroups: acceptedTypeGroups,
       initialDirectory: initialDirectory,
@@ -41,7 +41,7 @@ Future<String> getSavePath({
   String suggestedName,
   String confirmButtonText,
 }) async {
-  _verifyExtensions(acceptedTypeGroups);
+  acceptedTypeGroups = _verifyTypeGroups(acceptedTypeGroups);
   return FileSelectorPlatform.instance.getSavePath(
       acceptedTypeGroups: acceptedTypeGroups,
       initialDirectory: initialDirectory,
@@ -58,15 +58,21 @@ Future<String> getDirectoryPath({
       initialDirectory: initialDirectory, confirmButtonText: confirmButtonText);
 }
 
-void _verifyExtensions(List<XTypeGroup> acceptedTypeGroups) {
-  acceptedTypeGroups?.asMap()?.forEach((i, acceptedTypeGroup) {
-    acceptedTypeGroup.extensions?.asMap()?.forEach((j, ext) {
-      if (kDebugMode && ext.startsWith('.')) {
-        print(
-          'acceptedTypeGroups[${i}].extensions[${j}] with value "${ext}" is invalid.'
-          ' Remove the leading dot.',
-        );
+List<XTypeGroup> _verifyTypeGroups(List<XTypeGroup> groups) {
+  if (groups == null) return groups;
+  for (var i = 0; i < groups.length; i++) {
+    if (groups[i] == null || groups[i].extensions == null) continue;
+    for (var j = 0; j < groups[i].extensions.length; j++) {
+      if (groups[i].extensions[j] == null) continue;
+      if (groups[i].extensions[j].startsWith('.')) {
+        if (kDebugMode) {
+          print('acceptedTypeGroups[${i}].extensions[${j}]'
+              ' with value "${groups[i].extensions[j]} is invalid.'
+              ' Please remove the leading dot.');
+        }
+        groups[i].extensions[j] = groups[i].extensions[j].substring(1);
       }
-    });
-  });
+    }
+  }
+  return groups;
 }

packages/file_selector/file_selector/test/file_selector_test.dart

@@ -79,6 +79,24 @@ void main() {
       final file = await openFile(acceptedTypeGroups: acceptedTypeGroups);
       expect(file, expectedFile);
     });
+
+    test('works with an extension with leading dot', () async {
+      final correctTypeGroups = [
+        XTypeGroup(label: 'images', extensions: [
+          'jpg',
+          'png',
+        ]),
+      ];
+      final incorrectTypeGroups = [
+        XTypeGroup(label: 'images', extensions: [
+          '.jpg',
+          '.png',
+        ]),
+      ];
+
+      openFile(acceptedTypeGroups: incorrectTypeGroups);
+      verify(mock.openFile(acceptedTypeGroups: incorrectTypeGroups));
+    });
   });
 
   group('openFiles', () {

packages/file_selector/file_selector_platform_interface/lib/src/types/x_type_group/x_type_group.dart

@@ -41,4 +41,11 @@ class XTypeGroup {
       'webWildCards': webWildCards,
     };
   }
+
+  bool operator ==(o) =>
+      label == o.label &&
+      listEquals(extensions, o.extensions) &&
+      listEquals(mimeTypes, o.mimeTypes) &&
+      listEquals(macUTIs, o.macUTIs) &&
+      listEquals(webWildCards, o.webWildCards);
 }