author Ryan VanderMeulen <>
Mon, 15 Jun 2015 15:55:28 -0400
changeset 279669 cd0d976e5f5c6389512cad8f2cae03526b0fb0f3
parent 272011 bd079aadd3feeee3f9b9f73c5e0bc4bd6a870722
child 307032 21605be9a2c7a5a9c526e79afc062caf3d7725a1
permissions -rw-r--r--
Merge inbound to m-c. a=merge

/* -*- 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 */

 * 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 "nsAttrAndChildArray.h"
#include "nsMappedAttributeElement.h"
#include "nsIStyleRule.h"
#include "mozilla/Attributes.h"
#include "mozilla/MemoryReporting.h"

class nsIAtom;
class nsHTMLStyleSheet;

class nsMappedAttributes final : public nsIStyleRule
  nsMappedAttributes(nsHTMLStyleSheet* aSheet,
                     nsMapRuleToAttributesFunc aMapRuleFunc);

  // Do not return null.
  void* operator new(size_t size, uint32_t aAttrCount = 1) CPP_THROW_NEW;
  nsMappedAttributes* Clone(bool aWillAddAttr);


  void SetAndTakeAttr(nsIAtom* aAttrName, nsAttrValue& aValue);
  const nsAttrValue* GetAttr(nsIAtom* aAttrName) const;
  const nsAttrValue* GetAttr(const nsAString& aAttrName) const;

  uint32_t Count() const
    return mAttrCount;

  bool Equals(const nsMappedAttributes* aAttributes) const;
  uint32_t HashValue() const;

  void DropStyleSheetReference()
    mSheet = nullptr;
  void SetStyleSheet(nsHTMLStyleSheet* aSheet);
  nsHTMLStyleSheet* GetStyleSheet()
    return mSheet;

  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(nsIAtom* aLocalName) const;

  // nsIStyleRule 
  virtual void MapRuleInfoInto(nsRuleData* aRuleData) override;
#ifdef DEBUG
  virtual void List(FILE* out = stdout, int32_t aIndent = 0) const override;

  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

  nsMappedAttributes(const nsMappedAttributes& aCopy);

  struct InternalAttr
    nsAttrName mName;
    nsAttrValue mValue;

   * Due to a compiler bug in VisualAge C++ for AIX, we need to return the 
   * address of the first index into mAttrs here, instead of simply
   * returning mAttrs itself.
   * See Bug 231104 for more information.
  const InternalAttr* Attrs() const
    return reinterpret_cast<const InternalAttr*>(&(mAttrs[0]));
  InternalAttr* Attrs()
    return reinterpret_cast<InternalAttr*>(&(mAttrs[0]));

  uint16_t mAttrCount;
#ifdef DEBUG
  uint16_t mBufferSize;
  nsHTMLStyleSheet* mSheet; //weak
  nsMapRuleToAttributesFunc mRuleMapper;
  void* mAttrs[1];

#endif /* nsMappedAttributes_h___ */