The Tor Browser: content/base/src/nsAttrName.h@deefc01c0e14 (annotated)

content/base/src/nsAttrName.h@deefc01c0e14 (annotated)

content/base/src/nsAttrName.h

Thu, 15 Jan 2015 21:03:48 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 21:03:48 +0100
branch: TOR_BUG_9701
changeset 11: deefc01c0e14
permissions: -rw-r--r--

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

 /* -*- 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/. */
 /*
  * Class that represents the name (nodeinfo or atom) of an attribute;
  * using nodeinfos all the time is too slow, so we use atoms when we
  * can.
  */
 #ifndef nsAttrName_h___
 #define nsAttrName_h___
 #include "nsINodeInfo.h"
 #include "nsIAtom.h"
 #include "nsDOMString.h"
 #define NS_ATTRNAME_NODEINFO_BIT 1
 class nsAttrName
 {
 public:
   nsAttrName(const nsAttrName& aOther)
     : mBits(aOther.mBits)
   {
     AddRefInternalName();
   }
   explicit nsAttrName(nsIAtom* aAtom)
     : mBits(reinterpret_cast<uintptr_t>(aAtom))
   {
     NS_ASSERTION(aAtom, "null atom-name in nsAttrName");
     NS_ADDREF(aAtom);
   }
   explicit nsAttrName(nsINodeInfo* aNodeInfo)
   {
     NS_ASSERTION(aNodeInfo, "null nodeinfo-name in nsAttrName");
     if (aNodeInfo->NamespaceEquals(kNameSpaceID_None)) {
       mBits = reinterpret_cast<uintptr_t>(aNodeInfo->NameAtom());
       NS_ADDREF(aNodeInfo->NameAtom());
     }
     else {
       mBits = reinterpret_cast<uintptr_t>(aNodeInfo) |
               NS_ATTRNAME_NODEINFO_BIT;
       NS_ADDREF(aNodeInfo);
     }
   }
   ~nsAttrName()
   {
     ReleaseInternalName();
   }
   void SetTo(nsINodeInfo* aNodeInfo)
   {
     NS_ASSERTION(aNodeInfo, "null nodeinfo-name in nsAttrName");
     ReleaseInternalName();
     if (aNodeInfo->NamespaceEquals(kNameSpaceID_None)) {
       mBits = reinterpret_cast<uintptr_t>(aNodeInfo->NameAtom());
       NS_ADDREF(aNodeInfo->NameAtom());
     }
     else {
       mBits = reinterpret_cast<uintptr_t>(aNodeInfo) |
               NS_ATTRNAME_NODEINFO_BIT;
       NS_ADDREF(aNodeInfo);
     }
   }
   void SetTo(nsIAtom* aAtom)
   {
     NS_ASSERTION(aAtom, "null atom-name in nsAttrName");
     ReleaseInternalName();
     mBits = reinterpret_cast<uintptr_t>(aAtom);
     NS_ADDREF(aAtom);
   }
   bool IsAtom() const
   {
     return !(mBits & NS_ATTRNAME_NODEINFO_BIT);
   }
   nsINodeInfo* NodeInfo() const
   {
     NS_ASSERTION(!IsAtom(), "getting nodeinfo-value of atom-name");
     return reinterpret_cast<nsINodeInfo*>(mBits & ~NS_ATTRNAME_NODEINFO_BIT);
   }
   nsIAtom* Atom() const
   {
     NS_ASSERTION(IsAtom(), "getting atom-value of nodeinfo-name");
     return reinterpret_cast<nsIAtom*>(mBits);
   }
   bool Equals(const nsAttrName& aOther) const
   {
     return mBits == aOther.mBits;
   }
   // Faster comparison in the case we know the namespace is null
   bool Equals(nsIAtom* aAtom) const
   {
     return reinterpret_cast<uintptr_t>(aAtom) == mBits;
   }
   // And the same but without forcing callers to atomize
   bool Equals(const nsAString& aLocalName) const
   {
     return IsAtom() && Atom()->Equals(aLocalName);
   }
   bool Equals(nsIAtom* aLocalName, int32_t aNamespaceID) const
   {
     if (aNamespaceID == kNameSpaceID_None) {
       return Equals(aLocalName);
     }
     return !IsAtom() && NodeInfo()->Equals(aLocalName, aNamespaceID);
   }
   bool Equals(nsINodeInfo* aNodeInfo) const
   {
     return Equals(aNodeInfo->NameAtom(), aNodeInfo->NamespaceID());
   }
   int32_t NamespaceID() const
   {
     return IsAtom() ? kNameSpaceID_None : NodeInfo()->NamespaceID();
   }
   int32_t NamespaceEquals(int32_t aNamespaceID) const
   {
     return aNamespaceID == kNameSpaceID_None ?
            IsAtom() :
            (!IsAtom() && NodeInfo()->NamespaceEquals(aNamespaceID));
   }
   nsIAtom* LocalName() const
   {
     return IsAtom() ? Atom() : NodeInfo()->NameAtom();
   }
   nsIAtom* GetPrefix() const
   {
     return IsAtom() ? nullptr : NodeInfo()->GetPrefixAtom();
   }
   bool QualifiedNameEquals(const nsAString& aName) const
   {
     return IsAtom() ? Atom()->Equals(aName) :
                       NodeInfo()->QualifiedNameEquals(aName);
   }
   void GetQualifiedName(nsAString& aStr) const
   {
     if (IsAtom()) {
       Atom()->ToString(aStr);
     }
     else {
       aStr = NodeInfo()->QualifiedName();
     }
   }
 #ifdef MOZILLA_INTERNAL_API
   void GetPrefix(nsAString& aStr) const
   {
     if (IsAtom()) {
       SetDOMStringToNull(aStr);
     }
     else {
       NodeInfo()->GetPrefix(aStr);
     }
   }
 #endif
   uint32_t HashValue() const
   {
     // mBits and uint32_t might have different size. This should silence
     // any warnings or compile-errors. This is what the implementation of
     // NS_PTR_TO_INT32 does to take care of the same problem.
     return mBits - 0;
   }
   bool IsSmaller(nsIAtom* aOther) const
   {
     return mBits < reinterpret_cast<uintptr_t>(aOther);
   }
 private:
   void AddRefInternalName()
   {
     // Since both nsINodeInfo and nsIAtom inherit nsISupports as its first
     // interface we can safely assume that it's first in the vtable
     nsISupports* name = reinterpret_cast<nsISupports *>
                                         (mBits & ~NS_ATTRNAME_NODEINFO_BIT);
     NS_ADDREF(name);
   }
   void ReleaseInternalName()
   {
     // Since both nsINodeInfo and nsIAtom inherit nsISupports as its first
     // interface we can safely assume that it's first in the vtable
     nsISupports* name = reinterpret_cast<nsISupports *>
                                         (mBits & ~NS_ATTRNAME_NODEINFO_BIT);
     NS_RELEASE(name);
   }
   uintptr_t mBits;
 };
 #endif

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content/base/src/nsAttrName.h@deefc01c0e14 (annotated)

content/base/src/nsAttrName.h