Add Dart_ListGetRange

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
@@ skipping 1350 matching lines @@
   result = Dart_ListGetAt(list_access_test_obj, 2);
   EXPECT_VALID(result);
   result = Dart_IntegerToInt64(result, &value);
   EXPECT_VALID(result);
   EXPECT_EQ(30, value);
 
   // Check if we get an exception when accessing beyond limit.
   result = Dart_ListGetAt(list_access_test_obj, 4);
   EXPECT(Dart_IsError(result));
 
+  // Check if we can get a range of values.
+  result = Dart_ListGetRange(list_access_test_obj, 8, 4, nullptr);
+  EXPECT(Dart_IsError(result));
+
+  const int kRangeOffset = 1;
+  const int kRangeLength = 3 - kRangeOffset;
+  Dart_Handle values[kRangeLength];
+  result = Dart_ListGetRange(val, kOffset, kRangeLength, values);
+  EXPECT_VALID(result);
+
+  result = Dart_IntegerToInt64(values[0], &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(20, value);
+
+  result = Dart_IntegerToInt64(values[1], &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(30, value);
+
   // Check that we get an exception (and not a fatal error) when
   // calling ListSetAt and ListSetAsBytes with an immutable list.
   list_access_test_obj = Dart_Invoke(lib, NewString("immutable"), 0, NULL);
   EXPECT_VALID(list_access_test_obj);
   EXPECT(Dart_IsList(list_access_test_obj));
 
   result = Dart_ListSetAsBytes(list_access_test_obj, 0, native_array, 3);
   EXPECT(Dart_IsError(result));
   EXPECT(Dart_IsUnhandledExceptionError(result));
 
@@ skipping 7891 matching lines @@
   Dart_TimelineAsyncEnd("testAsyncEvent", async_id);
 
   // Check that it is in the output.
   TimelineEventRecorder* recorder = isolate->timeline_event_recorder();
   JSONStream js;
   recorder->PrintJSON(&js);
   EXPECT_SUBSTRING("testAsyncEvent", js.ToCString());
 }
 
 }  // namespace dart