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// Copyright (c) 2013 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 <memory>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "content/common/content_export.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_var.h"
#include "ppapi/shared_impl/scoped_pp_var.h"
#include "v8/include/v8.h"
namespace content {
class ResourceConverter;
class CONTENT_EXPORT V8VarConverter {
// Whether or not to allow converting object vars. If they are not allowed
// and they are passed in, conversion will fail.
enum AllowObjectVars {
V8VarConverter(PP_Instance instance, AllowObjectVars object_vars_allowed);
// Constructor for testing.
V8VarConverter(PP_Instance instance,
std::unique_ptr<ResourceConverter> resource_converter);
// Converts the given PP_Var to a v8::Value. True is returned upon success.
bool ToV8Value(const PP_Var& var,
v8::Local<v8::Context> context,
v8::Local<v8::Value>* result);
struct VarResult {
VarResult() : completed_synchronously(false), success(false) {}
// True if the conversion completed synchronously and the callback will not
// be called.
bool completed_synchronously;
// True if the conversion was successful. Only valid if
// |completed_synchronously| is true.
bool success;
// The result if the conversion was successful. Only valid if
// |completed_synchronously| and |success| are true.
ppapi::ScopedPPVar var;
// Converts the given v8::Value to a PP_Var. Every PP_Var in the reference
// graph in the result will have a refcount equal to the number of references
// to it in the graph. The root of the result will have one additional
// reference. The callback is run when conversion is complete with the
// resulting var and a bool indicating success or failure. Conversion may be
// asynchronous because converting some resources may result in communication
// across IPC. |context| is guaranteed to only be used synchronously. If
// the conversion can occur synchronously, |callback| will not be run,
// otherwise it will be run.
VarResult FromV8Value(
v8::Local<v8::Value> val,
v8::Local<v8::Context> context,
const base::Callback<void(const ppapi::ScopedPPVar&, bool)>& callback);
bool FromV8ValueSync(v8::Local<v8::Value> val,
v8::Local<v8::Context> context,
ppapi::ScopedPPVar* result_var);
// Returns true on success, false on failure.
bool FromV8ValueInternal(v8::Local<v8::Value> val,
v8::Local<v8::Context> context,
ppapi::ScopedPPVar* result_var);
PP_Instance instance_;
// Whether or not to support conversion to PP_VARTYPE_OBJECT.
AllowObjectVars object_vars_allowed_;
// The converter to use for converting V8 vars to resources.
std::unique_ptr<ResourceConverter> resource_converter_;
} // namespace content