Extend V8ValueConverter::Strategy for the needs of Gin Java Bridge

content/renderer/v8_value_converter_impl_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/test/values_test_util.h"
 #include "base/values.h"
@@ skipping 693 matching lines @@
     base::DictionaryValue* current_as_object = NULL;
     ASSERT_TRUE(current->GetAsDictionary(&current_as_object)) << i;
     ASSERT_TRUE(current_as_object->Get(kKey, &current)) << i;
   }
 
   // The leaf node shouldn't have any properties.
   base::DictionaryValue empty;
   EXPECT_TRUE(base::Value::Equals(&empty, current)) << *current;
 }
 
+class V8ValueConverterOverridingStrategyForTesting
+    : public V8ValueConverter::Strategy {
+ public:
+  V8ValueConverterOverridingStrategyForTesting()
+      : reference_value_(NewReferenceValue()) {}
+  virtual bool FromV8Object(
+      v8::Handle<v8::Object> value,
+      base::Value** out,
+      v8::Isolate* isolate,
+      const FromV8ValueCallback& callback) const OVERRIDE {
+    *out = NewReferenceValue();
+    return true;
+  }
+  virtual bool FromV8Array(v8::Handle<v8::Array> value,
+                           base::Value** out,
+                           v8::Isolate* isolate,
+                           const FromV8ValueCallback& callback) const OVERRIDE {
+    *out = NewReferenceValue();
+    return true;
+  }
+  virtual bool FromV8ArrayBuffer(v8::Handle<v8::Object> value,
+                                 base::Value** out) const OVERRIDE {
+    *out = NewReferenceValue();
+    return true;
+  }
+  virtual bool FromV8Number(v8::Handle<v8::Number> value,
+                            base::Value** out) const OVERRIDE {
+    *out = NewReferenceValue();
+    return true;
+  }
+  virtual bool FromV8Undefined(base::Value** out) const OVERRIDE {
+    *out = NewReferenceValue();
+    return true;
+  }
+  base::Value* reference_value() const { return reference_value_.get(); }
+
+ private:
+  static base::Value* NewReferenceValue() {
+    return new base::StringValue("strategy");
+  }
+  scoped_ptr<base::Value> reference_value_;
+};
+
+TEST_F(V8ValueConverterImplTest, StrategyOverrides) {
+  v8::HandleScope handle_scope(isolate_);
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(isolate_, context_);
+  v8::Context::Scope context_scope(context);
+
+  V8ValueConverterImpl converter;
+  V8ValueConverterOverridingStrategyForTesting strategy;
+  converter.SetStrategy(&strategy);
+
+  v8::Handle<v8::Object> object(v8::Object::New(isolate_));
+  scoped_ptr<base::Value> object_value(converter.FromV8Value(object, context));
+  ASSERT_TRUE(object_value);
+  EXPECT_TRUE(
+      base::Value::Equals(strategy.reference_value(), object_value.get()));
+
+  v8::Handle<v8::Array> array(v8::Array::New(isolate_));
+  scoped_ptr<base::Value> array_value(converter.FromV8Value(array, context));
+  ASSERT_TRUE(array_value);
+  EXPECT_TRUE(
+      base::Value::Equals(strategy.reference_value(), array_value.get()));
+
+  v8::Handle<v8::ArrayBuffer> array_buffer(v8::ArrayBuffer::New(isolate_, 0));
+  scoped_ptr<base::Value> array_buffer_value(
+      converter.FromV8Value(array_buffer, context));
+  ASSERT_TRUE(array_buffer_value);
+  EXPECT_TRUE(base::Value::Equals(strategy.reference_value(),
+                                  array_buffer_value.get()));
+
+  v8::Handle<v8::ArrayBufferView> array_buffer_view(
+      v8::Uint8Array::New(array_buffer, 0, 0));
+  scoped_ptr<base::Value> array_buffer_view_value(
+      converter.FromV8Value(array_buffer_view, context));
+  ASSERT_TRUE(array_buffer_view_value);
+  EXPECT_TRUE(base::Value::Equals(strategy.reference_value(),
+                                  array_buffer_view_value.get()));
+
+  v8::Handle<v8::Number> number(v8::Number::New(isolate_, 0.0));
+  scoped_ptr<base::Value> number_value(converter.FromV8Value(number, context));
+  ASSERT_TRUE(number_value);
+  EXPECT_TRUE(
+      base::Value::Equals(strategy.reference_value(), number_value.get()));
+
+  v8::Handle<v8::Primitive> undefined(v8::Undefined(isolate_));
+  scoped_ptr<base::Value> undefined_value(
+      converter.FromV8Value(undefined, context));
+  ASSERT_TRUE(undefined_value);
+  EXPECT_TRUE(
+      base::Value::Equals(strategy.reference_value(), undefined_value.get()));
+}
+
+class V8ValueConverterBypassStrategyForTesting
+    : public V8ValueConverter::Strategy {
+ public:
+  virtual bool FromV8Object(
+      v8::Handle<v8::Object> value,
+      base::Value** out,
+      v8::Isolate* isolate,
+      const FromV8ValueCallback& callback) const OVERRIDE {
+    return false;
+  }
+  virtual bool FromV8Array(v8::Handle<v8::Array> value,
+                           base::Value** out,
+                           v8::Isolate* isolate,
+                           const FromV8ValueCallback& callback) const OVERRIDE {
+    return false;
+  }
+  virtual bool FromV8ArrayBuffer(v8::Handle<v8::Object> value,
+                                 base::Value** out) const OVERRIDE {
+    return false;
+  }
+  virtual bool FromV8Number(v8::Handle<v8::Number> value,
+                            base::Value** out) const OVERRIDE {
+    return false;
+  }
+  virtual bool FromV8Undefined(base::Value** out) const OVERRIDE {
+    return false;
+  }
+};
+
+// Verify that having a strategy that fallbacks to default behaviour
+// actually preserves it.
+TEST_F(V8ValueConverterImplTest, StrategyBypass) {
+  v8::HandleScope handle_scope(isolate_);
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(isolate_, context_);
+  v8::Context::Scope context_scope(context);
+
+  V8ValueConverterImpl converter;
+  V8ValueConverterBypassStrategyForTesting strategy;
+  converter.SetStrategy(&strategy);
+
+  v8::Handle<v8::Object> object(v8::Object::New(isolate_));
+  scoped_ptr<base::Value> object_value(converter.FromV8Value(object, context));
+  ASSERT_TRUE(object_value);
+  scoped_ptr<base::Value> reference_object_value(base::test::ParseJson("{}"));
+  EXPECT_TRUE(
+      base::Value::Equals(reference_object_value.get(), object_value.get()));
+
+  v8::Handle<v8::Array> array(v8::Array::New(isolate_));
+  scoped_ptr<base::Value> array_value(converter.FromV8Value(array, context));
+  ASSERT_TRUE(array_value);
+  scoped_ptr<base::Value> reference_array_value(base::test::ParseJson("[]"));
+  EXPECT_TRUE(
+      base::Value::Equals(reference_array_value.get(), array_value.get()));
+
+  // Not testing ArrayBuffers as V8ValueConverter uses blink helpers and
+  // this requires having blink to be initialized.
+
+  v8::Handle<v8::Number> number(v8::Number::New(isolate_, 0.0));
+  scoped_ptr<base::Value> number_value(converter.FromV8Value(number, context));
+  ASSERT_TRUE(number_value);
+  scoped_ptr<base::Value> reference_number_value(base::test::ParseJson("0"));
+  EXPECT_TRUE(
+      base::Value::Equals(reference_number_value.get(), number_value.get()));
+
+  v8::Handle<v8::Primitive> undefined(v8::Undefined(isolate_));
+  scoped_ptr<base::Value> undefined_value(
+      converter.FromV8Value(undefined, context));
+  EXPECT_FALSE(undefined_value);
+}
+
 }  // namespace content