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/* -*- Mode: C++; tab-width: 2; 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/. */
/*
* Implementation of the |attributes| property of DOM Core's Element object.
*/
#ifndef nsDOMAttributeMap_h
#define nsDOMAttributeMap_h
#include "mozilla/MemoryReporting.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/dom/Attr.h"
#include "mozilla/ErrorResult.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIDOMMozNamedAttrMap.h"
#include "nsRefPtrHashtable.h"
#include "nsString.h"
#include "nsWrapperCache.h"
class nsIAtom;
class nsIDocument;
/**
* Structure used as a key for caching Attrs in nsDOMAttributeMap's mAttributeCache.
*/
class nsAttrKey
{
public:
/**
* The namespace of the attribute
*/
int32_t mNamespaceID;
/**
* The atom for attribute, weak ref. is fine as we only use it for the
* hashcode, we never dereference it.
*/
nsIAtom* mLocalName;
nsAttrKey(int32_t aNs, nsIAtom* aName)
: mNamespaceID(aNs), mLocalName(aName) {}
nsAttrKey(const nsAttrKey& aAttr)
: mNamespaceID(aAttr.mNamespaceID), mLocalName(aAttr.mLocalName) {}
};
/**
* PLDHashEntryHdr implementation for nsAttrKey.
*/
class nsAttrHashKey : public PLDHashEntryHdr
{
public:
typedef const nsAttrKey& KeyType;
typedef const nsAttrKey* KeyTypePointer;
explicit nsAttrHashKey(KeyTypePointer aKey) : mKey(*aKey) {}
nsAttrHashKey(const nsAttrHashKey& aCopy) : mKey(aCopy.mKey) {}
~nsAttrHashKey() {}
KeyType GetKey() const { return mKey; }
bool KeyEquals(KeyTypePointer aKey) const
{
return mKey.mLocalName == aKey->mLocalName &&
mKey.mNamespaceID == aKey->mNamespaceID;
}
static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
static PLDHashNumber HashKey(KeyTypePointer aKey)
{
if (!aKey)
return 0;
return mozilla::HashGeneric(aKey->mNamespaceID, aKey->mLocalName);
}
enum { ALLOW_MEMMOVE = true };
private:
nsAttrKey mKey;
};
// Helper class that implements the nsIDOMMozNamedAttrMap interface.
class nsDOMAttributeMap : public nsIDOMMozNamedAttrMap
, public nsWrapperCache
{
public:
typedef mozilla::dom::Attr Attr;
typedef mozilla::dom::Element Element;
typedef mozilla::ErrorResult ErrorResult;
explicit nsDOMAttributeMap(Element *aContent);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(nsDOMAttributeMap)
// nsIDOMMozNamedAttrMap interface
NS_DECL_NSIDOMMOZNAMEDATTRMAP
void DropReference();
Element* GetContent()
{
return mContent;
}
/**
* Called when mContent is moved into a new document.
* Updates the nodeinfos of all owned nodes.
*/
nsresult SetOwnerDocument(nsIDocument* aDocument);
/**
* Drop an attribute from the map's cache (does not remove the attribute
* from the node!)
*/
void DropAttribute(int32_t aNamespaceID, nsIAtom* aLocalName);
/**
* Returns the number of attribute nodes currently in the map.
* Note: this is just the number of cached attribute nodes, not the number of
* attributes in mContent.
*
* @return The number of attribute nodes in the map.
*/
uint32_t Count() const;
typedef nsRefPtrHashtable<nsAttrHashKey, Attr> AttrCache;
/**
* Enumerates over the attribute nodess in the map and calls aFunc for each
* one. If aFunc returns PL_DHASH_STOP we'll stop enumerating at that point.
*
* @return The number of attribute nodes that aFunc was called for.
*/
uint32_t Enumerate(AttrCache::EnumReadFunction aFunc, void *aUserArg) const;
Element* GetParentObject() const
{
return mContent;
}
virtual JSObject* WrapObject(JSContext* aCx) override;
// WebIDL
Attr* GetNamedItem(const nsAString& aAttrName);
Attr* NamedGetter(const nsAString& aAttrName, bool& aFound);
bool NameIsEnumerable(const nsAString& aName);
already_AddRefed<Attr>
SetNamedItem(Attr& aAttr, ErrorResult& aError)
{
return SetNamedItemInternal(aAttr, false, aError);
}
already_AddRefed<Attr>
RemoveNamedItem(const nsAString& aName, ErrorResult& aError);
Attr* Item(uint32_t aIndex);
Attr* IndexedGetter(uint32_t aIndex, bool& aFound);
uint32_t Length() const;
Attr*
GetNamedItemNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName);
already_AddRefed<Attr>
SetNamedItemNS(Attr& aNode, ErrorResult& aError)
{
return SetNamedItemInternal(aNode, true, aError);
}
already_AddRefed<Attr>
RemoveNamedItemNS(const nsAString& aNamespaceURI, const nsAString& aLocalName,
ErrorResult& aError);
void GetSupportedNames(unsigned, nsTArray<nsString>& aNames)
{
// No supported names we want to show up in iteration.
}
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
protected:
virtual ~nsDOMAttributeMap();
private:
nsCOMPtr<Element> mContent;
/**
* Cache of Attrs. It's usually empty, and thus initialized lazily.
*/
mozilla::UniquePtr<AttrCache> mAttributeCache;
void EnsureAttributeCache();
/**
* SetNamedItem() (aWithNS = false) and SetNamedItemNS() (aWithNS =
* true) implementation.
*/
already_AddRefed<Attr>
SetNamedItemInternal(Attr& aNode, bool aWithNS, ErrorResult& aError);
already_AddRefed<mozilla::dom::NodeInfo>
GetAttrNodeInfo(const nsAString& aNamespaceURI,
const nsAString& aLocalName);
Attr* GetAttribute(mozilla::dom::NodeInfo* aNodeInfo, bool aNsAware);
/**
* Remove an attribute, returns the removed node.
*/
already_AddRefed<Attr> RemoveAttribute(mozilla::dom::NodeInfo* aNodeInfo);
};
// XXX khuey yes this is crazy. The bindings code needs to see this include,
// but if we pull it in at the top of the file we get a circular include
// problem.
#include "mozilla/dom/Element.h"
#endif /* nsDOMAttributeMap_h */
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