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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/. */
/*
* Storage of the attributes of a DOM node.
*/
#ifndef AttrArray_h___
#define AttrArray_h___
#include "mozilla/Attributes.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Span.h"
#include "mozilla/dom/BorrowedAttrInfo.h"
#include "nscore.h"
#include "nsAttrName.h"
#include "nsAttrValue.h"
#include "nsCaseTreatment.h"
class nsINode;
class nsIContent;
class nsMappedAttributes;
class nsHTMLStyleSheet;
class nsRuleWalker;
class nsMappedAttributeElement;
class AttrArray {
typedef mozilla::dom::BorrowedAttrInfo BorrowedAttrInfo;
public:
AttrArray() = default;
~AttrArray() = default;
bool HasAttrs() const { return NonMappedAttrCount() || MappedAttrCount(); }
uint32_t AttrCount() const {
return NonMappedAttrCount() + MappedAttrCount();
}
const nsAttrValue* GetAttr(const nsAtom* aLocalName,
int32_t aNamespaceID = kNameSpaceID_None) const;
// As above but using a string attr name and always using
// kNameSpaceID_None. This is always case-sensitive.
const nsAttrValue* GetAttr(const nsAString& aName) const;
// Get an nsAttrValue by qualified name. Can optionally do
// ASCII-case-insensitive name matching.
const nsAttrValue* GetAttr(const nsAString& aName,
nsCaseTreatment aCaseSensitive) const;
const nsAttrValue* AttrAt(uint32_t aPos) const;
// SetAndSwapAttr swaps the current attribute value with aValue.
// If the attribute was unset, an empty value will be swapped into aValue
// and aHadValue will be set to false. Otherwise, aHadValue will be set to
// true.
nsresult SetAndSwapAttr(nsAtom* aLocalName, nsAttrValue& aValue,
bool* aHadValue);
nsresult SetAndSwapAttr(mozilla::dom::NodeInfo* aName, nsAttrValue& aValue,
bool* aHadValue);
// Remove the attr at position aPos. The value of the attr is placed in
// aValue; any value that was already in aValue is destroyed.
nsresult RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue);
// Returns attribute name at given position, *not* out-of-bounds safe
const nsAttrName* AttrNameAt(uint32_t aPos) const;
// Returns the attribute info at a given position, *not* out-of-bounds safe
BorrowedAttrInfo AttrInfoAt(uint32_t aPos) const;
// Returns attribute name at given position or null if aPos is out-of-bounds
const nsAttrName* GetSafeAttrNameAt(uint32_t aPos) const;
const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const;
int32_t IndexOfAttr(const nsAtom* aLocalName,
int32_t aNamespaceID = kNameSpaceID_None) const;
// SetAndSwapMappedAttr swaps the current attribute value with aValue.
// If the attribute was unset, an empty value will be swapped into aValue
// and aHadValue will be set to false. Otherwise, aHadValue will be set to
// true.
nsresult SetAndSwapMappedAttr(nsAtom* aLocalName, nsAttrValue& aValue,
nsMappedAttributeElement* aContent,
nsHTMLStyleSheet* aSheet, bool* aHadValue);
nsresult SetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet) {
if (!mImpl || !mImpl->mMappedAttrs) {
return NS_OK;
}
return DoSetMappedAttrStyleSheet(aSheet);
}
// Update the rule mapping function on our mapped attributes, if we have any.
// We take a nsMappedAttributeElement, not a nsMapRuleToAttributesFunc,
// because the latter is defined in a header we can't include here.
nsresult UpdateMappedAttrRuleMapper(nsMappedAttributeElement& aElement) {
if (!mImpl || !mImpl->mMappedAttrs) {
return NS_OK;
}
return DoUpdateMappedAttrRuleMapper(aElement);
}
void Compact();
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
bool HasMappedAttrs() const { return MappedAttrCount(); }
const nsMappedAttributes* GetMapped() const;
// Force this to have mapped attributes, even if those attributes are empty.
nsresult ForceMapped(nsMappedAttributeElement* aContent,
mozilla::dom::Document* aDocument);
// Clear the servo declaration block on the mapped attributes, if any
// Will assert off main thread
void ClearMappedServoStyle();
// Increases capacity (if necessary) to have enough space to accomodate the
// unmapped attributes of |aOther|.
nsresult EnsureCapacityToClone(const AttrArray& aOther);
struct InternalAttr {
nsAttrName mName;
nsAttrValue mValue;
};
private:
AttrArray(const AttrArray& aOther) = delete;
AttrArray& operator=(const AttrArray& aOther) = delete;
uint32_t NonMappedAttrCount() const { return mImpl ? mImpl->mAttrCount : 0; }
uint32_t MappedAttrCount() const {
return mImpl && mImpl->mMappedAttrs ? DoGetMappedAttrCount() : 0;
}
uint32_t DoGetMappedAttrCount() const;
// Returns a non-null zero-refcount object.
nsMappedAttributes* GetModifiableMapped(nsMappedAttributeElement* aContent,
nsHTMLStyleSheet* aSheet,
bool aWillAddAttr,
int32_t aAttrCount = 1);
nsresult MakeMappedUnique(nsMappedAttributes* aAttributes);
bool GrowBy(uint32_t aGrowSize);
// Tries to create an attribute, growing the buffer if needed, with the given
// name and value.
//
// The value is moved from the argument.
//
// `Name` can be anything you construct a `nsAttrName` with (either an atom or
// a NodeInfo pointer).
template <typename Name>
nsresult AddNewAttribute(Name*, nsAttrValue&);
/**
* Guts of SetMappedAttrStyleSheet for the rare case when we have mapped attrs
*/
nsresult DoSetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet);
/**
* Guts of UpdateMappedAttrRuleMapper for the case when we have mapped attrs.
*/
nsresult DoUpdateMappedAttrRuleMapper(nsMappedAttributeElement& aElement);
#ifdef _MSC_VER
// Disable MSVC warning 'nonstandard extension used: zero-sized array in
// struct/union'
# pragma warning(push)
# pragma warning(disable : 4200)
#endif
class Impl {
public:
constexpr static size_t AllocationSizeForAttributes(uint32_t aAttrCount) {
return sizeof(Impl) + aAttrCount * sizeof(InternalAttr);
}
auto NonMappedAttrs() const {
return mozilla::Span<const InternalAttr>{mBuffer, mAttrCount};
}
auto NonMappedAttrs() {
return mozilla::Span<InternalAttr>{mBuffer, mAttrCount};
}
Impl(const Impl&) = delete;
Impl(Impl&&) = delete;
~Impl();
uint32_t mAttrCount;
uint32_t mCapacity; // In number of InternalAttrs
// Manually refcounted.
nsMappedAttributes* mMappedAttrs;
// Allocated in the same buffer as `Impl`.
InternalAttr mBuffer[0];
};
#ifdef _MSC_VER
# pragma warning(pop)
#endif
mozilla::Span<InternalAttr> NonMappedAttrs() {
return mImpl ? mImpl->NonMappedAttrs() : mozilla::Span<InternalAttr>();
}
mozilla::Span<const InternalAttr> NonMappedAttrs() const {
return mImpl ? mImpl->NonMappedAttrs()
: mozilla::Span<const InternalAttr>();
}
mozilla::UniquePtr<Impl> mImpl;
};
#endif
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