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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/*
* representation of a declaration block in a CSS stylesheet, or of
* a style attribute
*/
#ifndef mozilla_DeclarationBlock_h
#define mozilla_DeclarationBlock_h
#include "mozilla/ServoUtils.h"
#include "mozilla/StyleBackendType.h"
#include "nsCSSPropertyID.h"
class nsHTMLCSSStyleSheet;
namespace mozilla {
class ServoDeclarationBlock;
namespace css {
class Declaration;
class Rule;
} // namespace css
class DeclarationBlock
{
protected:
explicit DeclarationBlock(StyleBackendType aType)
: mImmutable(false), mType(aType) { mContainer.mRaw = 0; }
DeclarationBlock(const DeclarationBlock& aCopy)
: DeclarationBlock(aCopy.mType) {}
public:
MOZ_DECL_STYLO_METHODS(css::Declaration, ServoDeclarationBlock)
inline MozExternalRefCountType AddRef();
inline MozExternalRefCountType Release();
inline already_AddRefed<DeclarationBlock> Clone() const;
/**
* Return whether |this| may be modified.
*/
bool IsMutable() const {
return !mImmutable;
}
/**
* Crash if |this| cannot be modified.
*/
void AssertMutable() const {
MOZ_ASSERT(IsMutable(), "someone forgot to call EnsureMutable");
}
/**
* Mark this declaration as unmodifiable. It's 'const' so it can
* be called from ToString.
*/
void SetImmutable() const { mImmutable = true; }
/**
* Copy |this|, if necessary to ensure that it can be modified.
*/
inline already_AddRefed<DeclarationBlock> EnsureMutable();
void SetOwningRule(css::Rule* aRule) {
MOZ_ASSERT(!mContainer.mOwningRule || !aRule,
"should never overwrite one rule with another");
mContainer.mOwningRule = aRule;
}
css::Rule* GetOwningRule() const {
if (mContainer.mRaw & 0x1) {
return nullptr;
}
return mContainer.mOwningRule;
}
void SetHTMLCSSStyleSheet(nsHTMLCSSStyleSheet* aHTMLCSSStyleSheet) {
MOZ_ASSERT(!mContainer.mHTMLCSSStyleSheet || !aHTMLCSSStyleSheet,
"should never overwrite one sheet with another");
mContainer.mHTMLCSSStyleSheet = aHTMLCSSStyleSheet;
if (aHTMLCSSStyleSheet) {
mContainer.mRaw |= uintptr_t(1);
}
}
nsHTMLCSSStyleSheet* GetHTMLCSSStyleSheet() const {
if (!(mContainer.mRaw & 0x1)) {
return nullptr;
}
auto c = mContainer;
c.mRaw &= ~uintptr_t(1);
return c.mHTMLCSSStyleSheet;
}
inline void ToString(nsAString& aString) const;
inline uint32_t Count() const;
inline bool GetNthProperty(uint32_t aIndex, nsAString& aReturn) const;
inline void GetPropertyValue(const nsAString& aProperty,
nsAString& aValue) const;
inline void GetPropertyValueByID(nsCSSPropertyID aPropID,
nsAString& aValue) const;
inline void GetAuthoredPropertyValue(const nsAString& aProperty,
nsAString& aValue) const;
inline bool GetPropertyIsImportant(const nsAString& aProperty) const;
inline void RemoveProperty(const nsAString& aProperty);
inline void RemovePropertyByID(nsCSSPropertyID aProperty);
private:
union {
// We only ever have one of these since we have an
// nsHTMLCSSStyleSheet only for style attributes, and style
// attributes never have an owning rule.
// It's an nsHTMLCSSStyleSheet if the low bit is set.
uintptr_t mRaw;
// The style rule that owns this declaration. May be null.
css::Rule* mOwningRule;
// The nsHTMLCSSStyleSheet that is responsible for this declaration.
// Only non-null for style attributes.
nsHTMLCSSStyleSheet* mHTMLCSSStyleSheet;
} mContainer;
// set when declaration put in the rule tree;
// also by ToString (hence the 'mutable').
mutable bool mImmutable;
const StyleBackendType mType;
};
} // namespace mozilla
#endif // mozilla_DeclarationBlock_h
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