Remove CppBoundClass and webkit_renderer.gyp

webkit/renderer/cpp_bound_class.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.
-
-// This file contains definitions for CppBoundClass
-
-// Here's the control flow of a JS method getting forwarded to a class.
-// - Something calls our NPObject with a function like "Invoke".
-// - CppNPObject's static invoke() function forwards it to its attached
-//   CppBoundClass's Invoke() method.
-// - CppBoundClass has then overridden Invoke() to look up the function
-//   name in its internal map of methods, and then calls the appropriate
-//   method.
-
-#include "webkit/renderer/cpp_bound_class.h"
-
-#include "base/compiler_specific.h"
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "third_party/WebKit/public/web/WebBindings.h"
-#include "third_party/WebKit/public/web/WebFrame.h"
-#include "third_party/WebKit/public/platform/WebString.h"
-
-using blink::WebBindings;
-using blink::WebFrame;
-
-namespace webkit_glue {
-
-namespace {
-
-class CppVariantPropertyCallback : public CppBoundClass::PropertyCallback {
- public:
-  CppVariantPropertyCallback(CppVariant* value) : value_(value) { }
-
-  virtual bool GetValue(CppVariant* value) OVERRIDE {
-    value->Set(*value_);
-    return true;
-  }
-  virtual bool SetValue(const CppVariant& value) OVERRIDE {
-    value_->Set(value);
-    return true;
-  }
-
- private:
-  CppVariant* value_;
-};
-
-class GetterPropertyCallback : public CppBoundClass::PropertyCallback {
-public:
-  GetterPropertyCallback(const CppBoundClass::GetterCallback& callback)
-      : callback_(callback) { }
-
-  virtual bool GetValue(CppVariant* value) OVERRIDE {
-    callback_.Run(value);
-    return true;
-  }
-
-  virtual bool SetValue(const CppVariant& value) OVERRIDE {
-    return false;
-  }
-
-private:
-  CppBoundClass::GetterCallback callback_;
-};
-
-}
-
-// Our special NPObject type.  We extend an NPObject with a pointer to a
-// CppBoundClass, which is just a C++ interface that we forward all NPObject
-// callbacks to.
-struct CppNPObject {
-  NPObject parent;  // This must be the first field in the struct.
-  CppBoundClass* bound_class;
-
-  //
-  // All following objects and functions are static, and just used to interface
-  // with NPObject/NPClass.
-  //
-
-  // An NPClass associates static functions of CppNPObject with the
-  // function pointers used by the JS runtime.
-  static NPClass np_class_;
-
-  // Allocate a new NPObject with the specified class.
-  static NPObject* allocate(NPP npp, NPClass* aClass);
-
-  // Free an object.
-  static void deallocate(NPObject* obj);
-
-  // Returns true if the C++ class associated with this NPObject exposes the
-  // given property.  Called by the JS runtime.
-  static bool hasProperty(NPObject *obj, NPIdentifier ident);
-
-  // Returns true if the C++ class associated with this NPObject exposes the
-  // given method.  Called by the JS runtime.
-  static bool hasMethod(NPObject *obj, NPIdentifier ident);
-
-  // If the given method is exposed by the C++ class associated with this
-  // NPObject, invokes it with the given args and returns a result.  Otherwise,
-  // returns "undefined" (in the JavaScript sense).  Called by the JS runtime.
-  static bool invoke(NPObject *obj, NPIdentifier ident,
-                     const NPVariant *args, uint32_t arg_count,
-                     NPVariant *result);
-
-  // If the given property is exposed by the C++ class associated with this
-  // NPObject, returns its value.  Otherwise, returns "undefined" (in the
-  // JavaScript sense).  Called by the JS runtime.
-  static bool getProperty(NPObject *obj, NPIdentifier ident,
-                          NPVariant *result);
-
-  // If the given property is exposed by the C++ class associated with this
-  // NPObject, sets its value.  Otherwise, does nothing. Called by the JS
-  // runtime.
-  static bool setProperty(NPObject *obj, NPIdentifier ident,
-                          const NPVariant *value);
-};
-
-// Build CppNPObject's static function pointers into an NPClass, for use
-// in constructing NPObjects for the C++ classes.
-NPClass CppNPObject::np_class_ = {
-  NP_CLASS_STRUCT_VERSION,
-  CppNPObject::allocate,
-  CppNPObject::deallocate,
-  /* NPInvalidateFunctionPtr */ NULL,
-  CppNPObject::hasMethod,
-  CppNPObject::invoke,
-  /* NPInvokeDefaultFunctionPtr */ NULL,
-  CppNPObject::hasProperty,
-  CppNPObject::getProperty,
-  CppNPObject::setProperty,
-  /* NPRemovePropertyFunctionPtr */ NULL
-};
-
-/* static */ NPObject* CppNPObject::allocate(NPP npp, NPClass* aClass) {
-  CppNPObject* obj = new CppNPObject;
-  // obj->parent will be initialized by the NPObject code calling this.
-  obj->bound_class = NULL;
-  return &obj->parent;
-}
-
-/* static */ void CppNPObject::deallocate(NPObject* np_obj) {
-  CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-  delete obj;
-}
-
-/* static */ bool CppNPObject::hasMethod(NPObject* np_obj,
-                                         NPIdentifier ident) {
-  CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-  return obj->bound_class->HasMethod(ident);
-}
-
-/* static */ bool CppNPObject::hasProperty(NPObject* np_obj,
-                                           NPIdentifier ident) {
-  CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-  return obj->bound_class->HasProperty(ident);
-}
-
-/* static */ bool CppNPObject::invoke(NPObject* np_obj, NPIdentifier ident,
-                                      const NPVariant* args, uint32_t arg_count,
-                                      NPVariant* result) {
-  CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-  return obj->bound_class->Invoke(ident, args, arg_count, result);
-}
-
-/* static */ bool CppNPObject::getProperty(NPObject* np_obj,
-                                           NPIdentifier ident,
-                                           NPVariant* result) {
-  CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-  return obj->bound_class->GetProperty(ident, result);
-}
-
-/* static */ bool CppNPObject::setProperty(NPObject* np_obj,
-                                           NPIdentifier ident,
-                                           const NPVariant* value) {
-  CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-  return obj->bound_class->SetProperty(ident, value);
-}
-
-CppBoundClass::CppBoundClass() : bound_to_frame_(false), npp_(new NPP_t) {
-  WebBindings::registerObjectOwner(npp_.get());
-}
-
-CppBoundClass::~CppBoundClass() {
-  STLDeleteValues(&properties_);
-
-  // TODO(wez): Remove once crrev.com/14019005 lands.
-  if (bound_to_frame_)
-    WebBindings::unregisterObject(NPVARIANT_TO_OBJECT(self_variant_));
-
-  WebBindings::unregisterObjectOwner(npp_.get());
-}
-
-bool CppBoundClass::HasMethod(NPIdentifier ident) const {
-  return (methods_.find(ident) != methods_.end());
-}
-
-bool CppBoundClass::HasProperty(NPIdentifier ident) const {
-  return (properties_.find(ident) != properties_.end());
-}
-
-bool CppBoundClass::Invoke(NPIdentifier ident,
-                           const NPVariant* args,
-                           size_t arg_count,
-                           NPVariant* result) {
-  MethodList::const_iterator method = methods_.find(ident);
-  Callback callback;
-  if (method == methods_.end()) {
-    if (!fallback_callback_.is_null()) {
-      callback = fallback_callback_;
-    } else {
-      VOID_TO_NPVARIANT(*result);
-      return false;
-    }
-  } else {
-    callback = method->second;
-  }
-
-  // Build a CppArgumentList argument vector from the NPVariants coming in.
-  CppArgumentList cpp_args(arg_count);
-  for (size_t i = 0; i < arg_count; i++)
-    cpp_args[i].Set(args[i]);
-
-  CppVariant cpp_result;
-  callback.Run(cpp_args, &cpp_result);
-
-  cpp_result.CopyToNPVariant(result);
-  return true;
-}
-
-bool CppBoundClass::GetProperty(NPIdentifier ident, NPVariant* result) const {
-  PropertyList::const_iterator callback = properties_.find(ident);
-  if (callback == properties_.end()) {
-    VOID_TO_NPVARIANT(*result);
-    return false;
-  }
-
-  CppVariant cpp_value;
-  if (!callback->second->GetValue(&cpp_value))
-    return false;
-  cpp_value.CopyToNPVariant(result);
-  return true;
-}
-
-bool CppBoundClass::SetProperty(NPIdentifier ident,
-                                const NPVariant* value) {
-  PropertyList::iterator callback = properties_.find(ident);
-  if (callback == properties_.end())
-    return false;
-
-  CppVariant cpp_value;
-  cpp_value.Set(*value);
-  return (*callback).second->SetValue(cpp_value);
-}
-
-void CppBoundClass::BindCallback(const std::string& name,
-                                 const Callback& callback) {
-  NPIdentifier ident = WebBindings::getStringIdentifier(name.c_str());
-  if (callback.is_null()) {
-    methods_.erase(ident);
-    return;
-  }
-
-  methods_[ident] = callback;
-}
-
-void CppBoundClass::BindGetterCallback(const std::string& name,
-                                       const GetterCallback& callback) {
-  PropertyCallback* property_callback = callback.is_null() ?
-      NULL : new GetterPropertyCallback(callback);
-
-  BindProperty(name, property_callback);
-}
-
-void CppBoundClass::BindProperty(const std::string& name, CppVariant* prop) {
-  PropertyCallback* property_callback = prop == NULL ?
-      NULL : new CppVariantPropertyCallback(prop);
-
-  BindProperty(name, property_callback);
-}
-
-void CppBoundClass::BindProperty(const std::string& name,
-                                 PropertyCallback* callback) {
-  NPIdentifier ident = WebBindings::getStringIdentifier(name.c_str());
-  PropertyList::iterator old_callback = properties_.find(ident);
-  if (old_callback != properties_.end()) {
-    delete old_callback->second;
-    if (callback == NULL) {
-      properties_.erase(old_callback);
-      return;
-    }
-  }
-
-  properties_[ident] = callback;
-}
-
-bool CppBoundClass::IsMethodRegistered(const std::string& name) const {
-  NPIdentifier ident = WebBindings::getStringIdentifier(name.c_str());
-  MethodList::const_iterator callback = methods_.find(ident);
-  return (callback != methods_.end());
-}
-
-CppVariant* CppBoundClass::GetAsCppVariant() {
-  if (!self_variant_.isObject()) {
-    // Create an NPObject using our static NPClass.  The first argument has type
-    // NPP, but is only used to track object ownership, so passing this is fine.
-    NPObject* np_obj = WebBindings::createObject(
-        npp_.get(), &CppNPObject::np_class_);
-    CppNPObject* obj = reinterpret_cast<CppNPObject*>(np_obj);
-    obj->bound_class = this;
-    self_variant_.Set(np_obj);
-    WebBindings::releaseObject(np_obj);  // CppVariant takes the reference.
-  }
-  DCHECK(self_variant_.isObject());
-  return &self_variant_;
-}
-
-void CppBoundClass::BindToJavascript(WebFrame* frame,
-                                     const std::string& classname) {
-  // BindToWindowObject will take its own reference to the NPObject, and clean
-  // up after itself. It will also (indirectly) register the object with V8,
-  // against an owner pointer we supply, so we must register that as an owner,
-  // and unregister when we teardown.
-  frame->bindToWindowObject(base::ASCIIToUTF16(classname),
-                            NPVARIANT_TO_OBJECT(*GetAsCppVariant()));
-  bound_to_frame_ = true;
-}
-
-}  // namespace webkit_glue