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Implementation

Mercurial (b219cfa26dc2)

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsXBLProtoImpl_h__
#define nsXBLProtoImpl_h__

#include "nsMemory.h"
#include "nsXBLPrototypeHandler.h"
#include "nsXBLProtoImplMember.h"
#include "nsXBLProtoImplField.h"
#include "nsXBLBinding.h"

class nsXBLPrototypeBinding;
class nsXBLProtoImplAnonymousMethod;

class nsXBLProtoImpl final {
 public:
  nsXBLProtoImpl()
      : mPrecompiledMemberHolder(nullptr),
        mMembers(nullptr),
        mFields(nullptr),
        mConstructor(nullptr),
        mDestructor(nullptr) {
    MOZ_COUNT_CTOR(nsXBLProtoImpl);
  }
  ~nsXBLProtoImpl() {
    MOZ_COUNT_DTOR(nsXBLProtoImpl);
    // Note: the constructor and destructor are in mMembers, so we'll
    // clean them up automatically.
    delete mMembers;
    delete mFields;
  }

  nsresult InstallImplementation(nsXBLPrototypeBinding* aPrototypeBinding,
                                 nsXBLBinding* aBinding);

 private:
  nsresult InitTargetObjects(nsXBLPrototypeBinding* aBinding,
                             nsIContent* aBoundElement,
                             JS::MutableHandle<JSObject*> aTargetClassObject,
                             bool* aTargetIsNew);

 public:
  nsresult CompilePrototypeMembers(nsXBLPrototypeBinding* aBinding);

  bool LookupMember(JSContext* aCx, nsString& aName, JS::Handle<jsid> aNameAsId,
                    JS::MutableHandle<JS::PropertyDescriptor> aDesc,
                    JS::Handle<JSObject*> aClassObject);

  void SetMemberList(nsXBLProtoImplMember* aMemberList) {
    delete mMembers;
    mMembers = aMemberList;
  }

  void SetFieldList(nsXBLProtoImplField* aFieldList) {
    delete mFields;
    mFields = aFieldList;
  }

  void Trace(const TraceCallbacks& aCallbacks, void* aClosure);
  void UnlinkJSObjects();

  nsXBLProtoImplField* FindField(const nsString& aFieldName) const;

  // Resolve all the fields for this implementation on the object |obj| False
  // return means a JS exception was set.
  bool ResolveAllFields(JSContext* cx, JS::Handle<JSObject*> obj) const;

  // Undefine all our fields from object |obj| (which should be a
  // JSObject for a bound element).
  void UndefineFields(JSContext* cx, JS::Handle<JSObject*> obj) const;

  bool CompiledMembers() const { return mPrecompiledMemberHolder != nullptr; }

  nsresult Read(nsIObjectInputStream* aStream, nsXBLPrototypeBinding* aBinding);
  nsresult Write(nsIObjectOutputStream* aStream,
                 nsXBLPrototypeBinding* aBinding);

 protected:
  // used by Read to add each member
  nsXBLProtoImplMember* AddMember(nsXBLProtoImplMember* aMember,
                                  nsXBLProtoImplMember* aPreviousMember) {
    if (aPreviousMember)
      aPreviousMember->SetNext(aMember);
    else
      mMembers = aMember;
    return aMember;
  }

  void DestroyMembers();

 public:
  nsString mClassName;  // The name of the class.

 protected:
  JSObject*
      mPrecompiledMemberHolder;  // The class object for the binding. We'll use
                                 // this to pre-compile properties and methods
                                 // for the binding.

  nsXBLProtoImplMember* mMembers;  // The members of an implementation are
                                   // chained in this singly-linked list.

  nsXBLProtoImplField* mFields;  // Our fields

 public:
  nsXBLProtoImplAnonymousMethod* mConstructor;  // Our class constructor.
  nsXBLProtoImplAnonymousMethod* mDestructor;   // Our class destructor.
};

void NS_NewXBLProtoImpl(nsXBLPrototypeBinding* aBinding,
                        const char16_t* aClassName, nsXBLProtoImpl** aResult);

#endif  // nsXBLProtoImpl_h__