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gecko-dev/layout/style/nsRuleNode.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Original Author: David W. Hyatt (hyatt@netscape.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsRuleNode_h___
#define nsRuleNode_h___
#include "nsPresContext.h"
#include "nsStyleStruct.h"
class nsStyleContext;
struct nsRuleList;
struct PLDHashTable;
class nsILanguageAtomService;
struct nsRuleData;
class nsIStyleRule;
struct nsCSSStruct;
// Copy of typedef that's in nsCSSStruct.h, for compilation speed.
typedef nsCSSStruct nsRuleDataStruct;
struct nsRuleDataFont;
class nsCSSValue;
typedef void (*nsPostResolveFunc)(nsStyleStruct* aStyleStruct, nsRuleData* aData);
struct nsInheritedStyleData
{
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
nsStyle##name * m##name##Data;
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
};
void ClearInheritedData(PRUint32 aBits) {
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
if (m##name##Data && (aBits & NS_STYLE_INHERIT_BIT(name))) \
m##name##Data = nsnull;
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
};
void Destroy(PRUint32 aBits, nsPresContext* aContext) {
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
if (m##name##Data && !(aBits & NS_STYLE_INHERIT_BIT(name))) \
m##name##Data->Destroy(aContext);
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
aContext->FreeToShell(sizeof(nsInheritedStyleData), this);
};
nsInheritedStyleData() {
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
m##name##Data = nsnull;
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
};
};
struct nsResetStyleData
{
nsResetStyleData()
{
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
m##name##Data = nsnull;
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
};
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
}
void ClearInheritedData(PRUint32 aBits) {
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
if (m##name##Data && (aBits & NS_STYLE_INHERIT_BIT(name))) \
m##name##Data = nsnull;
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
};
void Destroy(PRUint32 aBits, nsPresContext* aContext) {
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
if (m##name##Data && !(aBits & NS_STYLE_INHERIT_BIT(name))) \
m##name##Data->Destroy(aContext);
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
aContext->FreeToShell(sizeof(nsResetStyleData), this);
};
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
nsStyle##name * m##name##Data;
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
};
struct nsCachedStyleData
{
struct StyleStructInfo {
ptrdiff_t mCachedStyleDataOffset;
ptrdiff_t mInheritResetOffset;
PRBool mIsReset;
};
static StyleStructInfo gInfo[];
nsInheritedStyleData* mInheritedData;
nsResetStyleData* mResetData;
static PRBool IsReset(const nsStyleStructID& aSID) {
return gInfo[aSID].mIsReset;
};
static PRUint32 GetBitForSID(const nsStyleStructID& aSID) {
return 1 << aSID;
};
NS_HIDDEN_(nsStyleStruct*) NS_FASTCALL GetStyleData(const nsStyleStructID& aSID) {
// Each struct is stored at this.m##type##Data->m##name##Data where
// |type| is either Inherit or Reset, and |name| is the name of the
// style struct. The |gInfo| stores the offset of the appropriate
// m##type##Data for the struct within nsCachedStyleData (|this|)
// and the offset of the appropriate m##name##Data within the
// m##type##Data. Note that if we don't have any reset structs,
// then mResetData is null, and likewise for mInheritedData. This
// saves us from having to go through the long if-else cascade into
// which most compilers will turn a case statement.
// NOTE: nsStyleContext::SetStyle works roughly the same way.
const StyleStructInfo& info = gInfo[aSID];
// Get either &mInheritedData or &mResetData.
char* resetOrInheritSlot = NS_REINTERPRET_CAST(char*, this) + info.mCachedStyleDataOffset;
// Get either mInheritedData or mResetData.
char* resetOrInherit = NS_REINTERPRET_CAST(char*, *NS_REINTERPRET_CAST(void**, resetOrInheritSlot));
nsStyleStruct* data = nsnull;
if (resetOrInherit) {
// If we have the mInheritedData or mResetData, then we might have
// the struct, so get it.
char* dataSlot = resetOrInherit + info.mInheritResetOffset;
data = *NS_REINTERPRET_CAST(nsStyleStruct**, dataSlot);
}
return data;
};
NS_HIDDEN_(void) ClearInheritedData(PRUint32 aBits) {
if (mResetData)
mResetData->ClearInheritedData(aBits);
if (mInheritedData)
mInheritedData->ClearInheritedData(aBits);
}
NS_HIDDEN_(void) Destroy(PRUint32 aBits, nsPresContext* aContext) {
if (mResetData)
mResetData->Destroy(aBits, aContext);
if (mInheritedData)
mInheritedData->Destroy(aBits, aContext);
mResetData = nsnull;
mInheritedData = nsnull;
}
nsCachedStyleData() :mInheritedData(nsnull), mResetData(nsnull) {};
~nsCachedStyleData() {};
};
/**
* nsRuleNode is a node in a lexicographic tree (the "rule tree")
* indexed by style rules (implementations of nsIStyleRule).
*
* The rule tree is owned by the nsStyleSet and is destroyed when the
* presentation of the document goes away. It is garbage-collected
* (using mark-and-sweep garbage collection) during the lifetime of the
* document (when dynamic changes cause the destruction of enough style
* contexts). Rule nodes are marked if they are pointed to by a style
* context or one of their descendants is.
*
* An nsStyleContext, which represents the computed style data for an
* element, points to an nsRuleNode. The path from the root of the rule
* tree to the nsStyleContext's mRuleNode gives the list of the rules
* matched, from least important in the cascading order to most
* important in the cascading order.
*
* The reason for using a lexicographic tree is that it allows for
* sharing of style data, which saves both memory (for storing the
* computed style data) and time (for computing them). This sharing
* depends on the computed style data being stored in structs (nsStyle*)
* that contain only properties that are inherited by default
* ("inherited structs") or structs that contain only properties that
* are not inherited by default ("reset structs"). The optimization
* depends on the normal case being that style rules specify relatively
* few properties and even that elements generally have relatively few
* properties specified. This allows sharing in the following ways:
* 1. [mainly reset structs] When a style data struct will contain the
* same computed value for any elements that match the same set of
* rules (common for reset structs), it can be stored on the
* nsRuleNode instead of on the nsStyleContext.
* 2. [only? reset structs] When (1) occurs, and an nsRuleNode doesn't
* have any rules that change the values in the struct, the
* nsRuleNode can share that struct with its parent nsRuleNode.
* 3. [mainly inherited structs] When an element doesn't match any
* rules that change the value of a property (or, in the edge case,
* when all the values specified are 'inherit'), the nsStyleContext
* can use the same nsStyle* struct as its parent nsStyleContext.
*
* Since the data represented by an nsIStyleRule are immutable, the data
* represented by an nsRuleNode are also immutable (with a few
* exceptions, like system color changes).
*/
class nsRuleNode {
public:
enum RuleDetail {
eRuleNone, // No props have been specified at all.
eRulePartialReset, // At least one prop with a non-"inherit" value
// has been specified. No props have been
// specified with an "inherit" value. At least
// one prop remains unspecified.
eRulePartialMixed, // At least one prop with a non-"inherit" value
// has been specified. Some props may also have
// been specified with an "inherit" value. At
// least one prop remains unspecified.
eRulePartialInherited, // Only props with "inherit" values have
// have been specified. At least one prop
// remains unspecified.
eRuleFullReset, // All props have been specified. None has an
// "inherit" value.
eRuleFullMixed, // All props have been specified. At least one has
// a non-"inherit" value.
eRuleFullInherited, // All props have been specified with "inherit"
// values.
eRuleUnknown // Information unknown (used as a result from a check
// callback to trigger the normal checking codepath)
};
private:
nsPresContext* mPresContext; // Our pres context.
nsRuleNode* mParent; // A pointer to the parent node in the tree.
// This enables us to walk backwards from the
// most specific rule matched to the least
// specific rule (which is the optimal order to
// use for lookups of style properties.
nsIStyleRule* mRule; // [STRONG] A pointer to our specific rule.
// The children of this node are stored in either a hashtable or list
// that maps from rules to our nsRuleNode children. When matching
// rules, we use this mapping to transition from node to node
// (constructing new nodes as needed to flesh out the tree).
void *mChildrenTaggedPtr; // Accessed only through the methods below.
enum {
kTypeMask = 0x1,
kListType = 0x0,
kHashType = 0x1
};
enum {
// Maximum to have in a list before converting to a hashtable.
// XXX Need to optimize this.
kMaxChildrenInList = 32
};
PRBool HaveChildren() {
return mChildrenTaggedPtr != nsnull;
}
PRBool ChildrenAreHashed() {
return (PRWord(mChildrenTaggedPtr) & kTypeMask) == kHashType;
}
nsRuleList* ChildrenList() {
return NS_REINTERPRET_CAST(nsRuleList*, mChildrenTaggedPtr);
}
nsRuleList** ChildrenListPtr() {
return NS_REINTERPRET_CAST(nsRuleList**, &mChildrenTaggedPtr);
}
PLDHashTable* ChildrenHash() {
return (PLDHashTable*) (PRWord(mChildrenTaggedPtr) & ~PRWord(kTypeMask));
}
void SetChildrenList(nsRuleList *aList) {
NS_ASSERTION(!(PRWord(aList) & kTypeMask),
"pointer not 2-byte aligned");
mChildrenTaggedPtr = aList;
}
void SetChildrenHash(PLDHashTable *aHashtable) {
NS_ASSERTION(!(PRWord(aHashtable) & kTypeMask),
"pointer not 2-byte aligned");
mChildrenTaggedPtr = (void*)(PRWord(aHashtable) | kHashType);
}
void ConvertChildrenToHash();
nsCachedStyleData mStyleData; // Any data we cached on the rule node.
PRUint32 mDependentBits; // Used to cache the fact that we can look up
// cached data under a parent rule.
PRUint32 mNoneBits; // Used to cache the fact that the branch to this
// node specifies no non-inherited data for a
// given struct type. (This usually implies that
// the entire branch specifies no non-inherited
// data, although not necessarily, if a
// non-inherited value is overridden by an
// explicit 'inherit' value.) For example, if an
// entire rule branch specifies no color
// information, then a bit will be set along every
// rule node on that branch, so that you can break
// out of the rule tree early and just inherit
// from the parent style context. The presence of
// this bit means we should just get inherited
// data from the parent style context, and it is
// never used for reset structs since their
// Compute*Data functions don't initialize from
// inherited data.
friend struct nsRuleList;
public:
// Overloaded new operator. Initializes the memory to 0 and relies on an arena
// (which comes from the presShell) to perform the allocation.
NS_HIDDEN_(void*) operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW;
NS_HIDDEN_(void) Destroy();
static NS_HIDDEN_(nsILanguageAtomService*) gLangService;
protected:
NS_HIDDEN_(void) PropagateDependentBit(PRUint32 aBit,
nsRuleNode* aHighestNode);
NS_HIDDEN_(void) PropagateNoneBit(PRUint32 aBit, nsRuleNode* aHighestNode);
NS_HIDDEN_(const nsStyleStruct*) SetDefaultOnRoot(const nsStyleStructID aSID,
nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*)
WalkRuleTree(const nsStyleStructID aSID, nsStyleContext* aContext,
nsRuleData* aRuleData, nsRuleDataStruct* aSpecificData);
NS_HIDDEN_(const nsStyleStruct*)
ComputeDisplayData(nsStyleStruct* aStartDisplay,
const nsRuleDataStruct& aDisplayData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeVisibilityData(nsStyleStruct* aStartVisibility,
const nsRuleDataStruct& aDisplayData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeFontData(nsStyleStruct* aStartFont,
const nsRuleDataStruct& aFontData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeColorData(nsStyleStruct* aStartColor,
const nsRuleDataStruct& aColorData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeBackgroundData(nsStyleStruct* aStartBackground,
const nsRuleDataStruct& aColorData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeMarginData(nsStyleStruct* aStartMargin,
const nsRuleDataStruct& aMarginData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeBorderData(nsStyleStruct* aStartBorder,
const nsRuleDataStruct& aMarginData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputePaddingData(nsStyleStruct* aStartPadding,
const nsRuleDataStruct& aMarginData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeOutlineData(nsStyleStruct* aStartOutline,
const nsRuleDataStruct& aMarginData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeListData(nsStyleStruct* aStartList,
const nsRuleDataStruct& aListData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputePositionData(nsStyleStruct* aStartPosition,
const nsRuleDataStruct& aPositionData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeTableData(nsStyleStruct* aStartTable,
const nsRuleDataStruct& aTableData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeTableBorderData(nsStyleStruct* aStartTable,
const nsRuleDataStruct& aTableData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeContentData(nsStyleStruct* aStartContent,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeQuotesData(nsStyleStruct* aStartQuotes,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeTextData(nsStyleStruct* aStartData, const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeTextResetData(nsStyleStruct* aStartData,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeUserInterfaceData(nsStyleStruct* aStartData,
const nsRuleDataStruct& aData,
nsStyleContext* aContext,
nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeUIResetData(nsStyleStruct* aStartData,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeXULData(nsStyleStruct* aStartXUL, const nsRuleDataStruct& aXULData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeColumnData(nsStyleStruct* aStartColumn, const nsRuleDataStruct& aColumnData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
#ifdef MOZ_SVG
NS_HIDDEN_(const nsStyleStruct*)
ComputeSVGData(nsStyleStruct* aStartSVG, const nsRuleDataStruct& aSVGData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
NS_HIDDEN_(const nsStyleStruct*)
ComputeSVGResetData(nsStyleStruct* aStartSVG,
const nsRuleDataStruct& aSVGData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
const RuleDetail& aRuleDetail, PRBool aInherited);
#endif
// helpers for |ComputeFontData| that need access to |mNoneBits|:
static NS_HIDDEN_(void) SetFont(nsPresContext* aPresContext,
nsStyleContext* aContext,
nscoord aMinFontSize,
PRBool aIsGeneric,
const nsRuleDataFont& aFontData,
const nsFont& aDefaultFont,
const nsStyleFont* aParentFont,
nsStyleFont* aFont, PRBool& aInherited);
static NS_HIDDEN_(void) SetGenericFont(nsPresContext* aPresContext,
nsStyleContext* aContext,
const nsRuleDataFont& aFontData,
PRUint8 aGenericFontID,
nscoord aMinFontSize,
nsStyleFont* aFont);
NS_HIDDEN_(void) AdjustLogicalBoxProp(nsStyleContext* aContext,
const nsCSSValue& aLTRSource,
const nsCSSValue& aRTLSource,
const nsCSSValue& aLTRLogicalValue,
const nsCSSValue& aRTLLogicalValue,
const nsStyleSides& aParentRect,
nsStyleSides& aRect,
PRUint8 aSide,
PRInt32 aMask,
PRBool& aInherited);
inline RuleDetail CheckSpecifiedProperties(const nsStyleStructID aSID, const nsRuleDataStruct& aRuleDataStruct);
NS_HIDDEN_(const nsStyleStruct*) GetParentData(const nsStyleStructID aSID);
NS_HIDDEN_(const nsStyleStruct*) GetDisplayData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetVisibilityData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetFontData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetColorData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetBackgroundData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetMarginData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetBorderData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetPaddingData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetOutlineData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetListData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetPositionData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetTableData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*)
GetTableBorderData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetContentData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetQuotesData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetTextData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetTextResetData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*)
GetUserInterfaceData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetUIResetData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetXULData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetColumnData(nsStyleContext* aContext);
#ifdef MOZ_SVG
NS_HIDDEN_(const nsStyleStruct*) GetSVGData(nsStyleContext* aContext);
NS_HIDDEN_(const nsStyleStruct*) GetSVGResetData(nsStyleContext* aContext);
#endif
public:
nsRuleNode(nsPresContext* aPresContext, nsIStyleRule* aRule,
nsRuleNode* aParent) NS_HIDDEN;
virtual ~nsRuleNode() NS_HIDDEN;
static NS_HIDDEN_(nsRuleNode*) CreateRootNode(nsPresContext* aPresContext);
NS_HIDDEN_(nsresult) Transition(nsIStyleRule* aRule, nsRuleNode** aResult);
nsRuleNode* GetParent() const { return mParent; }
PRBool IsRoot() const { return mParent == nsnull; }
// NOTE: Does not |AddRef|.
nsIStyleRule* GetRule() const { return mRule; }
// NOTE: Does not |AddRef|.
nsPresContext* GetPresContext() const { return mPresContext; }
NS_HIDDEN_(nsresult) ClearStyleData();
NS_HIDDEN_(const nsStyleStruct*) GetStyleData(nsStyleStructID aSID,
nsStyleContext* aContext,
PRBool aComputeData);
/*
* Garbage collection. Mark walks up the tree, marking any unmarked
* ancestors until it reaches a marked one. Sweep recursively sweeps
* the children, destroys any that are unmarked, and clears marks,
* returning true if the node on which it was called was destroyed.
*/
NS_HIDDEN_(void) Mark();
NS_HIDDEN_(PRBool) Sweep();
};
#endif
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