82 lines
3.8 KiB
C
82 lines
3.8 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* some utilities for stylo */
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#ifndef mozilla_ServoUtils_h
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#define mozilla_ServoUtils_h
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#include "mozilla/TypeTraits.h"
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#ifdef MOZ_STYLO
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# define MOZ_DECL_STYLO_CHECK_METHODS \
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bool IsGecko() const { return !IsServo(); } \
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bool IsServo() const { return mType == StyleBackendType::Servo; }
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#else
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# define MOZ_DECL_STYLO_CHECK_METHODS \
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bool IsGecko() const { return true; } \
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bool IsServo() const { return false; }
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#endif
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/**
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* Macro used in a base class of |geckotype_| and |servotype_|.
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* The class should define |StyleBackendType mType;| itself.
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*/
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#define MOZ_DECL_STYLO_METHODS(geckotype_, servotype_) \
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MOZ_DECL_STYLO_CHECK_METHODS \
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inline geckotype_* AsGecko(); \
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inline servotype_* AsServo(); \
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inline const geckotype_* AsGecko() const; \
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inline const servotype_* AsServo() const;
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/**
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* Macro used in inline header of class |type_| with its Gecko and Servo
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* subclasses named |geckotype_| and |servotype_| correspondingly for
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* implementing the inline methods defined by MOZ_DECL_STYLO_METHODS.
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*/
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#define MOZ_DEFINE_STYLO_METHODS(type_, geckotype_, servotype_) \
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geckotype_* type_::AsGecko() { \
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MOZ_ASSERT(IsGecko()); \
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return static_cast<geckotype_*>(this); \
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} \
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servotype_* type_::AsServo() { \
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MOZ_ASSERT(IsServo()); \
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return static_cast<servotype_*>(this); \
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} \
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const geckotype_* type_::AsGecko() const { \
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MOZ_ASSERT(IsGecko()); \
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return static_cast<const geckotype_*>(this); \
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} \
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const servotype_* type_::AsServo() const { \
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MOZ_ASSERT(IsServo()); \
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return static_cast<const servotype_*>(this); \
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}
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#define MOZ_STYLO_THIS_TYPE mozilla::RemovePointer<decltype(this)>::Type
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#define MOZ_STYLO_GECKO_TYPE mozilla::RemovePointer<decltype(AsGecko())>::Type
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#define MOZ_STYLO_SERVO_TYPE mozilla::RemovePointer<decltype(AsServo())>::Type
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/**
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* Macro used to forward a method call to the concrete method defined by
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* the Servo or Gecko implementation. The class of the method using it
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* should use MOZ_DECL_STYLO_METHODS to define basic stylo methods.
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*/
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#define MOZ_STYLO_FORWARD_CONCRETE(method_, geckoargs_, servoargs_) \
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static_assert(!mozilla::IsSame<decltype(&MOZ_STYLO_THIS_TYPE::method_), \
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decltype(&MOZ_STYLO_GECKO_TYPE::method_)> \
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::value, "Gecko subclass should define its own " #method_); \
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static_assert(!mozilla::IsSame<decltype(&MOZ_STYLO_THIS_TYPE::method_), \
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decltype(&MOZ_STYLO_SERVO_TYPE::method_)> \
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::value, "Servo subclass should define its own " #method_); \
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if (IsServo()) { \
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return AsServo()->method_ servoargs_; \
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} \
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return AsGecko()->method_ geckoargs_;
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#define MOZ_STYLO_FORWARD(method_, args_) \
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MOZ_STYLO_FORWARD_CONCRETE(method_, args_, args_)
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#endif // mozilla_ServoUtils_h
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