Detect native extensions. Fixes dart-lang#34. (dart-lang#35)

Author: isoos

lib/src/platform.dart

@@ -12,6 +12,9 @@ abstract class KnownPlatforms {
   static const String flutter = 'flutter';
   static const String mirrors = 'mirrors';
 
+  /// Native extensions (Dart VM with C/C++ code).
+  static const String native = 'native';
+
   static const String angular = 'angular';
 }
 
@@ -45,23 +48,27 @@ class Platform extends Object with _$PlatformSerializerMixin {
 
   bool get hasConflict =>
       (!worksAnywhere) ||
-      (uses.contains(KnownPlatforms.flutter) && !worksInFlutter);
+      (uses.contains(KnownPlatforms.flutter) && !worksInFlutter) ||
+      (uses.contains(KnownPlatforms.native) && !worksInConsole);
 
   bool get worksEverywhere =>
       worksInBrowser && worksInConsole && worksInFlutter;
 
   bool get worksAnywhere => worksInBrowser || worksInConsole || worksInFlutter;
 
   bool get worksInBrowser =>
-      _hasNoUseOf([KnownPlatforms.flutter]) &&
+      _hasNoUseOf([KnownPlatforms.flutter, KnownPlatforms.native]) &&
       (uses.contains(KnownPlatforms.browser) ||
           _hasNoUseOf([KnownPlatforms.console]));
 
   bool get worksInConsole =>
       _hasNoUseOf([KnownPlatforms.browser, KnownPlatforms.flutter]);
 
-  bool get worksInFlutter =>
-      _hasNoUseOf([KnownPlatforms.browser, KnownPlatforms.mirrors]);
+  bool get worksInFlutter => _hasNoUseOf([
+        KnownPlatforms.browser,
+        KnownPlatforms.mirrors,
+        KnownPlatforms.native,
+      ]);
 
   bool _hasNoUseOf(Iterable<String> platforms) =>
       !platforms.any((p) => uses.contains(p));
@@ -104,6 +111,10 @@ Platform classifyPlatform(Iterable<String> dependencies) {
     uses.add(KnownPlatforms.mirrors);
   }
 
+  if (libs.any((String lib) => lib.startsWith('dart-ext:'))) {
+    uses.add(KnownPlatforms.native);
+  }
+
   // packages
   if (libs.any((p) => p.startsWith('package:angular2/'))) {
     uses.add(KnownPlatforms.angular);

test/platform_test.dart

@@ -83,6 +83,17 @@ void main() {
       expect(p.worksInFlutter, isFalse);
     });
 
+    test('detect native', () {
+      Platform p = classifyPlatform(['dart:io', 'dart-ext:some-extension']);
+      expect(p.hasConflict, isFalse);
+      expect(p.worksAnywhere, isTrue);
+      expect(p.worksEverywhere, isFalse);
+      expect(p.worksInBrowser, isFalse);
+      expect(p.worksInConsole, isTrue);
+      expect(p.worksInFlutter, isFalse);
+      expect(p.uses, [KnownPlatforms.console, KnownPlatforms.native]);
+    });
+
     test('detect angular', () {
       Platform p =
           classifyPlatform(['dart:html', 'package:angular2/angular2.dart']);
@@ -116,6 +127,17 @@ void main() {
       expect(p.worksInConsole, isFalse);
       expect(p.worksInFlutter, isFalse);
     });
+
+    test('native + dart:ui', () {
+      Platform p = classifyPlatform(['dart:ui', 'dart-ext:some-extension']);
+      expect(p.hasConflict, isTrue);
+      expect(p.worksAnywhere, isFalse);
+      expect(p.worksEverywhere, isFalse);
+      expect(p.worksInBrowser, isFalse);
+      expect(p.worksInConsole, isFalse);
+      expect(p.worksInFlutter, isFalse);
+      expect(p.uses, [KnownPlatforms.flutter, KnownPlatforms.native]);
+    });
   });
 
   group('PlatformSummary', () {