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Diffstat (limited to '')
-rw-r--r-- | dom/base/nsMappedAttributes.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/dom/base/nsMappedAttributes.h b/dom/base/nsMappedAttributes.h new file mode 100644 index 0000000000..a18582d88b --- /dev/null +++ b/dom/base/nsMappedAttributes.h @@ -0,0 +1,115 @@ +/* -*- 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/. */ + +/* + * A unique per-element set of attributes that is used as an + * nsIStyleRule; used to implement presentational attributes. + */ + +#ifndef nsMappedAttributes_h___ +#define nsMappedAttributes_h___ + +#include "AttrArray.h" +#include "nsMappedAttributeElement.h" +#include "mozilla/Attributes.h" +#include "mozilla/ServoBindingTypes.h" +#include "mozilla/MemoryReporting.h" + +class nsAtom; +class nsHTMLStyleSheet; + +class nsMappedAttributes final { + using InternalAttr = AttrArray::InternalAttr; + + public: + nsMappedAttributes(nsHTMLStyleSheet* aSheet, + nsMapRuleToAttributesFunc aMapRuleFunc); + + // Do not return null. + void* operator new(size_t size, uint32_t aAttrCount = 1) noexcept(true); + nsMappedAttributes* Clone(bool aWillAddAttr); + + NS_INLINE_DECL_REFCOUNTING_WITH_DESTROY(nsMappedAttributes, LastRelease()) + + void SetAndSwapAttr(nsAtom* aAttrName, nsAttrValue& aValue, + bool* aValueWasSet); + const nsAttrValue* GetAttr(const nsAtom* aAttrName) const; + const nsAttrValue* GetAttr(const nsAString& aAttrName) const; + + uint32_t Count() const { return mAttrCount; } + + bool Equals(const nsMappedAttributes* aAttributes) const; + PLDHashNumber HashValue() const; + + void DropStyleSheetReference() { mSheet = nullptr; } + void SetStyleSheet(nsHTMLStyleSheet* aSheet); + nsHTMLStyleSheet* GetStyleSheet() { return mSheet; } + + void SetRuleMapper(nsMapRuleToAttributesFunc aRuleMapper) { + mRuleMapper = aRuleMapper; + } + + auto Attrs() const { + return mozilla::Span<const InternalAttr>{mBuffer, mAttrCount}; + } + auto Attrs() { return mozilla::Span<InternalAttr>{mBuffer, mAttrCount}; } + const nsAttrName* NameAt(uint32_t aPos) const { + NS_ASSERTION(aPos < mAttrCount, "out-of-bounds"); + return &Attrs()[aPos].mName; + } + const nsAttrValue* AttrAt(uint32_t aPos) const { + NS_ASSERTION(aPos < mAttrCount, "out-of-bounds"); + return &Attrs()[aPos].mValue; + } + // Remove the attr at position aPos. The value of the attr is placed in + // aValue; any value that was already in aValue is destroyed. + void RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue); + const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const; + int32_t IndexOfAttr(const nsAtom* aLocalName) const; + + // Apply the contained mapper to the contained set of servo rules, + // unless the servo rules have already been initialized. + void LazilyResolveServoDeclaration(mozilla::dom::Document* aDocument); + + // Obtain the contained servo declaration block + // May return null if called before the inner block + // has been (lazily) resolved + const RefPtr<RawServoDeclarationBlock>& GetServoStyle() const { + return mServoStyle; + } + + void ClearServoStyle() { + MOZ_ASSERT(NS_IsMainThread()); + mServoStyle = nullptr; + } + + size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + + static void Shutdown(); + + private: + void LastRelease(); + + nsMappedAttributes(const nsMappedAttributes& aCopy); + ~nsMappedAttributes(); + + uint16_t mAttrCount; +#ifdef DEBUG + uint16_t mBufferSize; +#endif + nsHTMLStyleSheet* mSheet; // weak + nsMapRuleToAttributesFunc mRuleMapper; + RefPtr<RawServoDeclarationBlock> mServoStyle; + InternalAttr mBuffer[0]; + + static bool sShuttingDown; + + // We're caching some memory to avoid trashing the allocator. + // The memory stored at index N can hold N attribute values. + static nsTArray<void*>* sCachedMappedAttributeAllocations; +}; + +#endif /* nsMappedAttributes_h___ */ |