Move the Pepper implementation from webkit/glue/plugins/pepper_* to...

webkit/glue/plugins/pepper_plugin_object.cc

Index: webkit/glue/plugins/pepper_plugin_object.cc
===================================================================
--- webkit/glue/plugins/pepper_plugin_object.cc	(revision 69381)
+++ webkit/glue/plugins/pepper_plugin_object.cc	(working copy)
@@ -1,891 +0,0 @@
-// Copyright (c) 2010 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 "webkit/glue/plugins/pepper_plugin_object.h"
-
-#include "base/logging.h"
-#include "base/ref_counted.h"
-#include "base/scoped_ptr.h"
-#include "base/string_number_conversions.h"
-#include "base/string_util.h"
-#include "third_party/npapi/bindings/npapi.h"
-#include "third_party/npapi/bindings/npruntime.h"
-#include "ppapi/c/dev/ppb_var_deprecated.h"
-#include "ppapi/c/dev/ppp_class_deprecated.h"
-#include "ppapi/c/pp_resource.h"
-#include "ppapi/c/pp_var.h"
-#include "ppapi/c/ppb_class.h"
-#include "third_party/WebKit/WebKit/chromium/public/WebBindings.h"
-#include "webkit/glue/plugins/pepper_class.h"
-#include "webkit/glue/plugins/pepper_plugin_module.h"
-#include "webkit/glue/plugins/pepper_resource.h"
-#include "webkit/glue/plugins/pepper_string.h"
-#include "webkit/glue/plugins/pepper_var.h"
-
-using WebKit::WebBindings;
-
-namespace pepper {
-
-namespace {
-
-const char kInvalidValueException[] = "Error: Invalid value";
-const char kInvalidPluginValue[] = "Error: Plugin returned invalid value.";
-
-// -----------------------------------------------------------------------------
-// Utilities
-
-// Converts the given PP_Var to an NPVariant, returning true on success.
-// False means that the given variant is invalid. In this case, the result
-// NPVariant will be set to a void one.
-//
-// The contents of the PP_Var will be copied unless the PP_Var corresponds to
-// an object.
-bool PPVarToNPVariant(PP_Var var, NPVariant* result) {
-  switch (var.type) {
-    case PP_VARTYPE_UNDEFINED:
-      VOID_TO_NPVARIANT(*result);
-      break;
-    case PP_VARTYPE_NULL:
-      NULL_TO_NPVARIANT(*result);
-      break;
-    case PP_VARTYPE_BOOL:
-      BOOLEAN_TO_NPVARIANT(var.value.as_bool, *result);
-      break;
-    case PP_VARTYPE_INT32:
-      INT32_TO_NPVARIANT(var.value.as_int, *result);
-      break;
-    case PP_VARTYPE_DOUBLE:
-      DOUBLE_TO_NPVARIANT(var.value.as_double, *result);
-      break;
-    case PP_VARTYPE_STRING: {
-      scoped_refptr<StringVar> string(StringVar::FromPPVar(var));
-      if (!string) {
-        VOID_TO_NPVARIANT(*result);
-        return false;
-      }
-      const std::string& value = string->value();
-      STRINGN_TO_NPVARIANT(base::strdup(value.c_str()), value.size(), *result);
-      break;
-    }
-    case PP_VARTYPE_OBJECT: {
-      scoped_refptr<ObjectVar> object(ObjectVar::FromPPVar(var));
-      if (!object) {
-        VOID_TO_NPVARIANT(*result);
-        return false;
-      }
-      OBJECT_TO_NPVARIANT(WebBindings::retainObject(object->np_object()),
-                          *result);
-      break;
-    }
-  }
-  return true;
-}
-
-// PPVarArrayFromNPVariantArray ------------------------------------------------
-
-// Converts an array of NPVariants to an array of PP_Var, and scopes the
-// ownership of the PP_Var. This is used when converting argument lists from
-// WebKit to the plugin.
-class PPVarArrayFromNPVariantArray {
- public:
-  PPVarArrayFromNPVariantArray(PluginModule* module,
-                               size_t size,
-                               const NPVariant* variants)
-        : size_(size) {
-    if (size_ > 0) {
-      array_.reset(new PP_Var[size_]);
-      for (size_t i = 0; i < size_; i++)
-        array_[i] = Var::NPVariantToPPVar(module, &variants[i]);
-    }
-  }
-
-  ~PPVarArrayFromNPVariantArray() {
-    for (size_t i = 0; i < size_; i++)
-      Var::PluginReleasePPVar(array_[i]);
-  }
-
-  PP_Var* array() { return array_.get(); }
-
- private:
-  size_t size_;
-  scoped_array<PP_Var> array_;
-
-  DISALLOW_COPY_AND_ASSIGN(PPVarArrayFromNPVariantArray);
-};
-
-// PPVarFromNPObject -----------------------------------------------------------
-
-// Converts an NPObject tp PP_Var, and scopes the ownership of the PP_Var. This
-// is used when converting 'this' pointer from WebKit to the plugin.
-class PPVarFromNPObject {
- public:
-  PPVarFromNPObject(PluginModule* module, NPObject* object)
-      : var_(ObjectVar::NPObjectToPPVar(module, object)) {
-  }
-  ~PPVarFromNPObject() {
-    Var::PluginReleasePPVar(var_);
-  }
-  PP_Var var() const { return var_; }
- private:
-  const PP_Var var_;
-
-  DISALLOW_COPY_AND_ASSIGN(PPVarFromNPObject);
-};
-
-// PPResultAndExceptionToNPResult ----------------------------------------------
-
-// Convenience object for converting a PPAPI call that can throw an exception
-// and optionally return a value, back to the NPAPI layer which expects a
-// NPVariant as a result.
-//
-// Normal usage is that you will pass the result of exception() to the
-// PPAPI function as the exception output parameter. Then you will either
-// call SetResult with the result of the PPAPI call, or
-// CheckExceptionForNoResult if the PPAPI call doesn't return a PP_Var.
-//
-// Both SetResult and CheckExceptionForNoResult will throw an exception to
-// the JavaScript library if the plugin reported an exception. SetResult
-// will additionally convert the result to an NPVariant and write it to the
-// output parameter given in the constructor.
-class PPResultAndExceptionToNPResult {
- public:
-  // The object_var parameter is the object to associate any exception with.
-  // It may not be NULL.
-  //
-  // The np_result parameter is the NPAPI result output parameter. This may be
-  // NULL if there is no NPVariant result (like for HasProperty). If this is
-  // specified, you must call SetResult() to set it. If it is not, you must
-  // call CheckExceptionForNoResult to do the exception checking with no result
-  // conversion.
-  PPResultAndExceptionToNPResult(NPObject* object_var,
-                                 NPVariant* np_result)
-      : object_var_(object_var),
-        np_result_(np_result),
-        exception_(PP_MakeUndefined()),
-        success_(false),
-        checked_exception_(false) {
-  }
-
-  ~PPResultAndExceptionToNPResult() {
-    // The user should have called SetResult or CheckExceptionForNoResult
-    // before letting this class go out of scope, or the exception will have
-    // been lost.
-    DCHECK(checked_exception_);
-
-    ObjectVar::PluginReleasePPVar(exception_);
-  }
-
-  // Returns true if an exception has been set.
-  bool has_exception() const { return exception_.type != PP_VARTYPE_UNDEFINED; }
-
-  // Returns a pointer to the exception. You would pass this to the PPAPI
-  // function as the exception parameter. If it is set to non-void, this object
-  // will take ownership of destroying it.
-  PP_Var* exception() { return &exception_; }
-
-  // Returns true if everything succeeded with no exception. This is valid only
-  // after calling SetResult/CheckExceptionForNoResult.
-  bool success() const {
-    DCHECK(checked_exception_);
-    return success_;
-  }
-
-  // Call this with the return value of the PPAPI function. It will convert
-  // the result to the NPVariant output parameter and pass any exception on to
-  // the JS engine. It will update the success flag and return it.
-  bool SetResult(PP_Var result) {
-    DCHECK(!checked_exception_);  // Don't call more than once.
-    DCHECK(np_result_);  // Should be expecting a result.
-
-    checked_exception_ = true;
-
-    if (has_exception()) {
-      ThrowException();
-      success_ = false;
-    } else if (!PPVarToNPVariant(result, np_result_)) {
-      WebBindings::setException(object_var_, kInvalidPluginValue);
-      success_ = false;
-    } else {
-      success_ = true;
-    }
-
-    // No matter what happened, we need to release the reference to the
-    // value passed in. On success, a reference to this value will be in
-    // the np_result_.
-    Var::PluginReleasePPVar(result);
-    return success_;
-  }
-
-  // Call this after calling a PPAPI function that could have set the
-  // exception. It will pass the exception on to the JS engine and update
-  // the success flag.
-  //
-  // The success flag will be returned.
-  bool CheckExceptionForNoResult() {
-    DCHECK(!checked_exception_);  // Don't call more than once.
-    DCHECK(!np_result_);  // Can't have a result when doing this.
-
-    checked_exception_ = true;
-
-    if (has_exception()) {
-      ThrowException();
-      success_ = false;
-      return false;
-    }
-    success_ = true;
-    return true;
-  }
-
-  // Call this to ignore any exception. This prevents the DCHECK from failing
-  // in the destructor.
-  void IgnoreException() {
-    checked_exception_ = true;
-  }
-
- private:
-  // Throws the current exception to JS. The exception must be set.
-  void ThrowException() {
-    scoped_refptr<StringVar> string(StringVar::FromPPVar(exception_));
-    if (string) {
-      WebBindings::setException(object_var_, string->value().c_str());
-    }
-  }
-
-  NPObject* object_var_;  // Non-owning ref (see constructor).
-  NPVariant* np_result_;  // Output value, possibly NULL (see constructor).
-  PP_Var exception_;  // Exception set by the PPAPI call. We own a ref to it.
-  bool success_;  // See the success() function above.
-  bool checked_exception_;  // SetResult/CheckExceptionForNoResult was called.
-
-  DISALLOW_COPY_AND_ASSIGN(PPResultAndExceptionToNPResult);
-};
-
-// NPObjectAccessorWithIdentifier ----------------------------------------------
-
-// Helper class for our NPObject wrapper. This converts a call from WebKit
-// where it gives us an NPObject and an NPIdentifier to an easily-accessible
-// ObjectVar (corresponding to the NPObject) and PP_Var (corresponding to the
-// NPIdentifier).
-//
-// If the NPObject or identifier is invalid, we'll set is_valid() to false.
-// The caller should check is_valid() before doing anything with the class.
-//
-// JS can't have integer functions, so when dealing with these, we don't want
-// to allow integer identifiers. The calling code can decode if it wants to
-// allow integer identifiers (like for property access) or prohibit them
-// (like for method calling) by setting |allow_integer_identifier|. If this
-// is false and the identifier is an integer, we'll set is_valid() to false.
-//
-// Getting an integer identifier in this case should be impossible. V8
-// shouldn't be allowing this, and the Pepper Var calls from the plugin are
-// supposed to error out before calling into V8 (which will then call us back).
-// Aside from an egregious error, the only time this could happen is an NPAPI
-// plugin calling us.
-class NPObjectAccessorWithIdentifier {
- public:
-  NPObjectAccessorWithIdentifier(NPObject* object,
-                                 NPIdentifier identifier,
-                                 bool allow_integer_identifier)
-      : object_(PluginObject::FromNPObject(object)),
-        identifier_(PP_MakeUndefined()) {
-    if (object_) {
-      identifier_ = Var::NPIdentifierToPPVar(object_->module(), identifier);
-      if (identifier_.type == PP_VARTYPE_INT32 && !allow_integer_identifier)
-        identifier_.type = PP_VARTYPE_UNDEFINED;  // Mark it invalid.
-    }
-  }
-
-  ~NPObjectAccessorWithIdentifier() {
-    Var::PluginReleasePPVar(identifier_);
-  }
-
-  // Returns true if both the object and identifier are valid.
-  bool is_valid() const {
-    return object_ && identifier_.type != PP_VARTYPE_UNDEFINED;
-  }
-
-  PluginObject* object() { return object_; }
-  PP_Var identifier() const { return identifier_; }
-
- private:
-  PluginObject* object_;
-  PP_Var identifier_;
-
-  DISALLOW_COPY_AND_ASSIGN(NPObjectAccessorWithIdentifier);
-};
-
-// NPObject implementation in terms of PPP_Class_Deprecated --------------------
-
-NPObject* WrapperClass_Allocate(NPP npp, NPClass* unused) {
-  return PluginObject::AllocateObjectWrapper();
-}
-
-void WrapperClass_Deallocate(NPObject* np_object) {
-  PluginObject* plugin_object = PluginObject::FromNPObject(np_object);
-  if (!plugin_object)
-    return;
-  plugin_object->ppp_class()->Deallocate(plugin_object->ppp_class_data());
-  delete plugin_object;
-}
-
-void WrapperClass_Invalidate(NPObject* object) {
-}
-
-bool WrapperClass_HasMethod(NPObject* object, NPIdentifier method_name) {
-  NPObjectAccessorWithIdentifier accessor(object, method_name, false);
-  if (!accessor.is_valid())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(
-      accessor.object()->GetNPObject(), NULL);
-  bool rv = accessor.object()->ppp_class()->HasMethod(
-      accessor.object()->ppp_class_data(), accessor.identifier(),
-      result_converter.exception());
-  result_converter.CheckExceptionForNoResult();
-  return rv;
-}
-
-bool WrapperClass_Invoke(NPObject* object, NPIdentifier method_name,
-                         const NPVariant* argv, uint32_t argc,
-                         NPVariant* result) {
-  NPObjectAccessorWithIdentifier accessor(object, method_name, false);
-  if (!accessor.is_valid())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(
-      accessor.object()->GetNPObject(), result);
-  PPVarArrayFromNPVariantArray args(accessor.object()->module(), argc, argv);
-
-  return result_converter.SetResult(accessor.object()->ppp_class()->Call(
-      accessor.object()->ppp_class_data(), accessor.identifier(),
-      argc, args.array(), result_converter.exception()));
-}
-
-bool WrapperClass_InvokeDefault(NPObject* np_object, const NPVariant* argv,
-                                uint32_t argc, NPVariant* result) {
-  PluginObject* obj = PluginObject::FromNPObject(np_object);
-  if (!obj)
-    return false;
-
-  PPVarArrayFromNPVariantArray args(obj->module(), argc, argv);
-  PPResultAndExceptionToNPResult result_converter(obj->GetNPObject(), result);
-
-  result_converter.SetResult(obj->ppp_class()->Call(
-      obj->ppp_class_data(), PP_MakeUndefined(), argc, args.array(),
-      result_converter.exception()));
-  return result_converter.success();
-}
-
-bool WrapperClass_HasProperty(NPObject* object, NPIdentifier property_name) {
-  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
-  if (!accessor.is_valid())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(
-      accessor.object()->GetNPObject(), NULL);
-  bool rv = accessor.object()->ppp_class()->HasProperty(
-      accessor.object()->ppp_class_data(), accessor.identifier(),
-      result_converter.exception());
-  result_converter.CheckExceptionForNoResult();
-  return rv;
-}
-
-bool WrapperClass_GetProperty(NPObject* object, NPIdentifier property_name,
-                              NPVariant* result) {
-  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
-  if (!accessor.is_valid())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(
-      accessor.object()->GetNPObject(), result);
-  return result_converter.SetResult(accessor.object()->ppp_class()->GetProperty(
-      accessor.object()->ppp_class_data(), accessor.identifier(),
-      result_converter.exception()));
-}
-
-bool WrapperClass_SetProperty(NPObject* object, NPIdentifier property_name,
-                              const NPVariant* value) {
-  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
-  if (!accessor.is_valid())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(
-      accessor.object()->GetNPObject(), NULL);
-  PP_Var value_var = Var::NPVariantToPPVar(accessor.object()->module(), value);
-  accessor.object()->ppp_class()->SetProperty(
-      accessor.object()->ppp_class_data(), accessor.identifier(), value_var,
-      result_converter.exception());
-  Var::PluginReleasePPVar(value_var);
-  return result_converter.CheckExceptionForNoResult();
-}
-
-bool WrapperClass_RemoveProperty(NPObject* object, NPIdentifier property_name) {
-  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
-  if (!accessor.is_valid())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(
-      accessor.object()->GetNPObject(), NULL);
-  accessor.object()->ppp_class()->RemoveProperty(
-      accessor.object()->ppp_class_data(), accessor.identifier(),
-      result_converter.exception());
-  return result_converter.CheckExceptionForNoResult();
-}
-
-bool WrapperClass_Enumerate(NPObject* object, NPIdentifier** values,
-                            uint32_t* count) {
-  *values = NULL;
-  *count = 0;
-  PluginObject* obj = PluginObject::FromNPObject(object);
-  if (!obj)
-    return false;
-
-  uint32_t property_count = 0;
-  PP_Var* properties = NULL;  // Must be freed!
-  PPResultAndExceptionToNPResult result_converter(obj->GetNPObject(), NULL);
-  obj->ppp_class()->GetAllPropertyNames(obj->ppp_class_data(),
-                                        &property_count, &properties,
-                                        result_converter.exception());
-
-  // Convert the array of PP_Var to an array of NPIdentifiers. If any
-  // conversions fail, we will set the exception.
-  if (!result_converter.has_exception()) {
-    if (property_count > 0) {
-      *values = static_cast<NPIdentifier*>(
-          malloc(sizeof(NPIdentifier) * property_count));
-      *count = 0;  // Will be the number of items successfully converted.
-      for (uint32_t i = 0; i < property_count; ++i) {
-        if (!((*values)[i] = Var::PPVarToNPIdentifier(properties[i]))) {
-          // Throw an exception for the failed convertion.
-          *result_converter.exception() = StringVar::StringToPPVar(
-              obj->module(), kInvalidValueException);
-          break;
-        }
-        (*count)++;
-      }
-
-      if (result_converter.has_exception()) {
-        // We don't actually have to free the identifiers we converted since
-        // all identifiers leak anyway :( .
-        free(*values);
-        *values = NULL;
-        *count = 0;
-      }
-    }
-  }
-
-  // This will actually throw the exception, either from GetAllPropertyNames,
-  // or if anything was set during the conversion process.
-  result_converter.CheckExceptionForNoResult();
-
-  // Release the PP_Var that the plugin allocated. On success, they will all
-  // be converted to NPVariants, and on failure, we want them to just go away.
-  for (uint32_t i = 0; i < property_count; ++i)
-    Var::PluginReleasePPVar(properties[i]);
-  free(properties);
-  return result_converter.success();
-}
-
-bool WrapperClass_Construct(NPObject* object, const NPVariant* argv,
-                            uint32_t argc, NPVariant* result) {
-  PluginObject* obj = PluginObject::FromNPObject(object);
-  if (!obj)
-    return false;
-
-  PPVarArrayFromNPVariantArray args(obj->module(), argc, argv);
-  PPResultAndExceptionToNPResult result_converter(obj->GetNPObject(), result);
-  return result_converter.SetResult(obj->ppp_class()->Construct(
-      obj->ppp_class_data(), argc, args.array(),
-      result_converter.exception()));
-}
-
-const NPClass wrapper_class = {
-  NP_CLASS_STRUCT_VERSION,
-  WrapperClass_Allocate,
-  WrapperClass_Deallocate,
-  WrapperClass_Invalidate,
-  WrapperClass_HasMethod,
-  WrapperClass_Invoke,
-  WrapperClass_InvokeDefault,
-  WrapperClass_HasProperty,
-  WrapperClass_GetProperty,
-  WrapperClass_SetProperty,
-  WrapperClass_RemoveProperty,
-  WrapperClass_Enumerate,
-  WrapperClass_Construct
-};
-
-}  // namespace
-
-// PluginObject ----------------------------------------------------------------
-
-struct PluginObject::NPObjectWrapper : public NPObject {
-  // Points to the var object that owns this wrapper. This value may be NULL
-  // if there is no var owning this wrapper. This can happen if the plugin
-  // releases all references to the var, but a reference to the underlying
-  // NPObject is still held by script on the page.
-  PluginObject* obj;
-};
-
-PluginObject::PluginObject(PluginModule* module,
-                           NPObjectWrapper* object_wrapper,
-                           const PPP_Class_Deprecated* ppp_class,
-                           void* ppp_class_data)
-    : module_(module),
-      object_wrapper_(object_wrapper),
-      ppp_class_(ppp_class),
-      ppp_class_data_(ppp_class_data) {
-  // Make the object wrapper refer back to this class so our NPObject
-  // implementation can call back into the Pepper layer.
-  object_wrapper_->obj = this;
-  module_->AddPluginObject(this);
-}
-
-PluginObject::~PluginObject() {
-  // The wrapper we made for this NPObject may still have a reference to it
-  // from JavaScript, so we clear out its ObjectVar back pointer which will
-  // cause all calls "up" to the plugin to become NOPs. Our ObjectVar base
-  // class will release our reference to the object, which may or may not
-  // delete the NPObject.
-  DCHECK(object_wrapper_->obj == this);
-  object_wrapper_->obj = NULL;
-  module_->RemovePluginObject(this);
-}
-
-PP_Var PluginObject::Create(PluginModule* module,
-                            const PPP_Class_Deprecated* ppp_class,
-                            void* ppp_class_data) {
-  // This will internally end up calling our AllocateObjectWrapper via the
-  // WrapperClass_Allocated function which will have created an object wrapper
-  // appropriate for this class (derived from NPObject).
-  NPObjectWrapper* wrapper = static_cast<NPObjectWrapper*>(
-      WebBindings::createObject(NULL, const_cast<NPClass*>(&wrapper_class)));
-
-  // This object will register itself both with the NPObject and with the
-  // PluginModule. The NPObject will normally handle its lifetime, and it
-  // will get deleted in the destroy method. It may also get deleted when the
-  // plugin module is deallocated.
-  new PluginObject(module, wrapper, ppp_class, ppp_class_data);
-
-  // We can just use a normal ObjectVar to refer to this object from the
-  // plugin. It will hold a ref to the underlying NPObject which will in turn
-  // hold our pluginObject.
-  return ObjectVar::NPObjectToPPVar(module, wrapper);
-}
-
-NPObject* PluginObject::GetNPObject() const {
-  return object_wrapper_;
-}
-
-// static
-bool PluginObject::IsInstanceOf(NPObject* np_object,
-                                const PPP_Class_Deprecated* ppp_class,
-                                void** ppp_class_data) {
-  // Validate that this object is implemented by our wrapper class before
-  // trying to get the PluginObject.
-  if (np_object->_class != &wrapper_class)
-    return false;
-
-  PluginObject* plugin_object = FromNPObject(np_object);
-  if (!plugin_object)
-    return false;  // Object is no longer alive.
-
-  if (plugin_object->ppp_class() != ppp_class)
-    return false;
-  if (ppp_class_data)
-    *ppp_class_data = plugin_object->ppp_class_data();
-  return true;
-}
-
-// static
-PluginObject* PluginObject::FromNPObject(NPObject* object) {
-  return static_cast<NPObjectWrapper*>(object)->obj;
-}
-
-// static
-NPObject* PluginObject::AllocateObjectWrapper() {
-  NPObjectWrapper* wrapper = new NPObjectWrapper;
-  memset(wrapper, 0, sizeof(NPObjectWrapper));
-  return wrapper;
-}
-
-// VarObjectClass::InstanceData  -----------------------------------------------
-
-struct VarObjectClass::InstanceData : public NPObject {
-  InstanceData() : native_data(NULL) {}
-
-  scoped_refptr<VarObjectClass> object_class;
-  void* native_data;
-};
-
-// VarObjectClass::Property  ---------------------------------------------------
-
-VarObjectClass::Property::Property(const PP_ClassProperty& prop)
-    : method(prop.method),
-      getter(prop.getter),
-      setter(prop.setter),
-      writable(!(prop.modifiers & PP_OBJECTPROPERTY_MODIFIER_READONLY)),
-      enumerable(!(prop.modifiers & PP_OBJECTPROPERTY_MODIFIER_DONTENUM)) {
-}
-
-
-// VarObjectAccessorWithIdentifier ---------------------------------------------
-
-// Helper class for the new (PPB_Class) NPObject wrapper. This converts a call
-// from WebKit where it gives us an NPObject and an NPIdentifier to an
-// easily-accessible InstanceData (corresponding to the NPObject) and
-// std::string and Property (corresponding to the NPIdentifier).
-class VarObjectAccessorWithIdentifier {
- public:
-  VarObjectAccessorWithIdentifier(NPObject* object, NPIdentifier identifier)
-      : exists_(false),
-        instance_(static_cast<VarObjectClass::InstanceData*>(object)),
-        property_(NULL) {
-    if (instance_) {
-      const NPUTF8* string_value = NULL;
-      int32_t int_value = 0;
-      bool is_string = false;
-      WebBindings::extractIdentifierData(identifier, string_value, int_value,
-                                         is_string);
-      if (is_string) {
-        property_name_ = string_value;
-
-        const VarObjectClass::PropertyMap& properties =
-            instance_->object_class->properties();
-        VarObjectClass::PropertyMap::const_iterator it =
-            properties.find(property_name_);
-        if (it != properties.end()) {
-          property_ = &it->second;
-          exists_ = true;
-        }
-      }
-    }
-  }
-
-  // Return true if the object is valid, the identifier is valid, and the
-  // property with said name exists.
-  bool exists() const { return exists_; }
-  bool is_method() const { return exists() && property_->method; }
-  bool is_readable() const { return exists() && property_->getter; }
-  bool is_writable() const {
-    return exists() && property_->setter && property_->writable;
-  }
-  const VarObjectClass::InstanceData* instance() const { return instance_; }
-  const VarObjectClass::Property* property() const { return property_; }
-  PluginModule* module() const {
-    return instance_ ? instance_->object_class->module() : NULL;
-  }
-
- private:
-  bool exists_;
-  const VarObjectClass::InstanceData* instance_;
-  std::string property_name_;
-  const VarObjectClass::Property* property_;
-
-  DISALLOW_COPY_AND_ASSIGN(VarObjectAccessorWithIdentifier);
-};
-
-// NPObject implementation in terms of PPB_Class -------------------------------
-
-namespace {
-
-NPObject* VarObjectClassAllocate(NPP npp, NPClass* the_class) {
-  return new VarObjectClass::InstanceData;
-}
-
-void VarObjectClassDeallocate(NPObject* object) {
-  VarObjectClass::InstanceData* instance =
-      static_cast<VarObjectClass::InstanceData*>(object);
-  if (instance->object_class->instance_native_destructor())
-    instance->object_class->instance_native_destructor()(instance->native_data);
-  delete instance;
-}
-
-bool VarObjectClassHasMethod(NPObject* np_obj, NPIdentifier name) {
-  VarObjectAccessorWithIdentifier accessor(np_obj, name);
-  return accessor.is_method();
-}
-
-bool VarObjectClassInvoke(NPObject* np_obj, NPIdentifier name,
-                          const NPVariant* args, uint32 arg_count,
-                          NPVariant* result) {
-  VarObjectAccessorWithIdentifier accessor(np_obj, name);
-  if (!accessor.is_method())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(np_obj, result);
-  PPVarArrayFromNPVariantArray arguments(accessor.module(), arg_count, args);
-  PPVarFromNPObject self(accessor.module(), np_obj);
-
-  return result_converter.SetResult(accessor.property()->method(
-    accessor.instance()->native_data, self.var(), arguments.array(), arg_count,
-    result_converter.exception()));
-}
-
-bool VarObjectClassInvokeDefault(NPObject* np_obj,
-                                 const NPVariant* args,
-                                 uint32 arg_count,
-                                 NPVariant* result) {
-  VarObjectClass::InstanceData* instance =
-      static_cast<VarObjectClass::InstanceData*>(np_obj);
-  if (!instance || !instance->object_class->instance_invoke())
-    return false;
-
-  PPResultAndExceptionToNPResult result_converter(np_obj, result);
-  PPVarArrayFromNPVariantArray arguments(instance->object_class->module(),
-                                         arg_count, args);
-  PPVarFromNPObject self(instance->object_class->module(), np_obj);
-
-  return result_converter.SetResult(instance->object_class->instance_invoke()(
-      instance->native_data, self.var(), arguments.array(), arg_count,
-      result_converter.exception()));
-}
-
-bool VarObjectClassHasProperty(NPObject* np_obj, NPIdentifier name) {
-  VarObjectAccessorWithIdentifier accessor(np_obj, name);
-  return accessor.is_readable();
-}
-
-bool VarObjectClassGetProperty(NPObject* np_obj, NPIdentifier name,
-                               NPVariant* result) {
-  VarObjectAccessorWithIdentifier accessor(np_obj, name);
-  if (!accessor.is_readable()) {
-    return false;
-  }
-
-  PPResultAndExceptionToNPResult result_converter(np_obj, result);
-  PPVarFromNPObject self(accessor.module(), np_obj);
-
-  return result_converter.SetResult(accessor.property()->getter(
-    accessor.instance()->native_data, self.var(), 0, 0,
-    result_converter.exception()));
-}
-
-bool VarObjectClassSetProperty(NPObject* np_obj, NPIdentifier name,
-                     const NPVariant* variant) {
-  VarObjectAccessorWithIdentifier accessor(np_obj, name);
-  if (!accessor.is_writable()) {
-    return false;
-  }
-
-  PPResultAndExceptionToNPResult result_converter(np_obj, NULL);
-  PPVarArrayFromNPVariantArray arguments(accessor.module(), 1, variant);
-  PPVarFromNPObject self(accessor.module(), np_obj);
-
-  // Ignore return value.
-  Var::PluginReleasePPVar(accessor.property()->setter(
-      accessor.instance()->native_data, self.var(), arguments.array(), 1,
-      result_converter.exception()));
-
-  return result_converter.CheckExceptionForNoResult();
-}
-
-bool VarObjectClassEnumerate(NPObject *np_obj, NPIdentifier **value,
-                             uint32_t *count) {
-  VarObjectClass::InstanceData* instance =
-      static_cast<VarObjectClass::InstanceData*>(np_obj);
-  *count = 0;
-  *value = NULL;
-  if (!instance)
-    return false;
-
-  const VarObjectClass::PropertyMap& properties =
-      instance->object_class->properties();
-
-  // Don't bother calculating the size of enumerable properties, just allocate
-  // enough for all and then fill it partially.
-  *value = static_cast<NPIdentifier*>(
-      malloc(sizeof(NPIdentifier) * properties.size()));
-
-  NPIdentifier* inserter = *value;
-  for (VarObjectClass::PropertyMap::const_iterator i = properties.begin();
-      i != properties.end(); ++i)
-    if (i->second.enumerable)
-      *inserter++ = WebBindings::getStringIdentifier(i->first.c_str());
-
-  *count = inserter - *value;
-  return true;
-}
-
-NPClass objectclassvar_class = {
-  NP_CLASS_STRUCT_VERSION,
-  &VarObjectClassAllocate,
-  &VarObjectClassDeallocate,
-  NULL,
-  &VarObjectClassHasMethod,
-  &VarObjectClassInvoke,
-  &VarObjectClassInvokeDefault,
-  &VarObjectClassHasProperty,
-  &VarObjectClassGetProperty,
-  &VarObjectClassSetProperty,
-  NULL,
-  &VarObjectClassEnumerate,
-};
-
-// PPB_Class interface ---------------------------------------------------------
-
-PP_Resource Create(PP_Module module, PP_ClassDestructor destruct,
-                   PP_ClassFunction invoke, PP_ClassProperty* properties) {
-  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
-  if (!properties || !plugin_module)
-    return 0;
-  scoped_refptr<VarObjectClass> cls = new VarObjectClass(plugin_module,
-                                                         destruct,
-                                                         invoke,
-                                                         properties);
-  if (!cls)
-    return 0;
-  return cls->GetReference();
-}
-
-PP_Var Instantiate(PP_Resource class_object, void* native_data,
-                   PP_Var* exception) {
-  scoped_refptr<VarObjectClass> object_class =
-      Resource::GetAs<VarObjectClass>(class_object);
-  if (!object_class)
-    return PP_MakeUndefined();
-  NPObject* obj = WebBindings::createObject(NULL, &objectclassvar_class);
-  VarObjectClass::InstanceData* instance_data =
-      static_cast<VarObjectClass::InstanceData*>(obj);
-  instance_data->object_class = object_class;
-  instance_data->native_data = native_data;
-  return ObjectVar::NPObjectToPPVar(object_class->module(), obj);
-}
-
-}  // namespace
-
-// VarObjectClass --------------------------------------------------------------
-
-VarObjectClass::VarObjectClass(PluginModule* module,
-                               PP_ClassDestructor destruct,
-                               PP_ClassFunction invoke,
-                               PP_ClassProperty* properties)
-    : Resource(module),
-      instance_native_destructor_(destruct),
-      instance_invoke_(invoke) {
-  PP_ClassProperty* prop = properties;
-  while (prop->name) {
-    properties_.insert(std::make_pair(std::string(prop->name),
-                                      Property(*prop)));
-    ++prop;
-  }
-}
-
-// static
-const PPB_Class* VarObjectClass::GetInterface() {
-  static PPB_Class interface = {
-    &Create,
-    &Instantiate
-  };
-  return &interface;
-}
-
-// virtual
-VarObjectClass::~VarObjectClass() { }
-
-VarObjectClass* VarObjectClass::AsVarObjectClass() {
-  return this;
-}
-
-}  // namespace pepper