gecko-dev/layout/style/nsRuleProcessorData.h

284 lines
11 KiB
C++

/* -*- 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.org 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):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* 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 ***** */
/*
* data structures passed to nsIStyleRuleProcessor methods (to pull loop
* invariant computations out of the loop)
*/
#ifndef nsRuleProcessorData_h_
#define nsRuleProcessorData_h_
#include "nsPresContext.h" // for nsCompatability
#include "nsString.h"
#include "nsChangeHint.h"
#include "nsIContent.h"
#include "nsCSSPseudoElements.h"
#include "nsRuleWalker.h"
#include "nsNthIndexCache.h"
class nsIStyleSheet;
class nsIAtom;
class nsICSSPseudoComparator;
class nsAttrValue;
/**
* A |TreeMatchContext| has data about a matching operation. The
* data are not node-specific but are invariants of the DOM tree the
* nodes being matched against are in.
*
* Most of the members are in parameters to selector matching. The
* one out parameter is mHaveRelevantLink. Consumers that use a
* TreeMatchContext for more than one matching operation and care
* about :visited and mHaveRelevantLink need to
* ResetForVisitedMatching() and ResetForUnvisitedMatching() as
* needed.
*/
struct NS_STACK_CLASS TreeMatchContext {
// Reset this context for matching for the style-if-:visited.
void ResetForVisitedMatching() {
NS_PRECONDITION(mForStyling, "Why is this being called?");
mHaveRelevantLink = PR_FALSE;
mVisitedHandling = nsRuleWalker::eRelevantLinkVisited;
}
void ResetForUnvisitedMatching() {
NS_PRECONDITION(mForStyling, "Why is this being called?");
mHaveRelevantLink = PR_FALSE;
mVisitedHandling = nsRuleWalker::eRelevantLinkUnvisited;
}
void SetHaveRelevantLink() { mHaveRelevantLink = PR_TRUE; }
PRBool HaveRelevantLink() const { return mHaveRelevantLink; }
nsRuleWalker::VisitedHandlingType VisitedHandling() const
{
return mVisitedHandling;
}
// Is this matching operation for the creation of a style context?
// (If it is, we need to set slow selector bits on nodes indicating
// that certain restyling needs to happen.)
const PRBool mForStyling;
private:
// When mVisitedHandling is eRelevantLinkUnvisited, this is set to true if a
// relevant link (see explanation in definition of VisitedHandling enum) was
// encountered during the matching process, which means that matching needs
// to be rerun with eRelevantLinkVisited. Otherwise, its behavior is
// undefined (it might get set appropriately, or might not).
PRBool mHaveRelevantLink;
// How matching should be performed. See the documentation for
// nsRuleWalker::VisitedHandlingType.
nsRuleWalker::VisitedHandlingType mVisitedHandling;
public:
// The document we're working with.
nsIDocument* const mDocument;
// Root of scoped stylesheet (set and unset by the supplier of the
// scoped stylesheet).
nsIContent* mScopedRoot;
// Whether our document is HTML (as opposed to XML of some sort,
// including XHTML).
// XXX XBL2 issue: Should we be caching this? What should it be for XBL2?
const PRPackedBool mIsHTMLDocument;
// Possibly remove use of mCompatMode in SelectorMatches?
// XXX XBL2 issue: Should we be caching this? What should it be for XBL2?
const nsCompatibility mCompatMode;
// The nth-index cache we should use
nsNthIndexCache mNthIndexCache;
// Constructor to use when creating a tree match context for styling
TreeMatchContext(PRBool aForStyling,
nsRuleWalker::VisitedHandlingType aVisitedHandling,
nsIDocument* aDocument)
: mForStyling(aForStyling)
, mHaveRelevantLink(PR_FALSE)
, mVisitedHandling(aVisitedHandling)
, mDocument(aDocument)
, mScopedRoot(nsnull)
, mIsHTMLDocument(aDocument->IsHTML())
, mCompatMode(aDocument->GetCompatibilityMode())
{
}
};
// The implementation of the constructor and destructor are currently in
// nsCSSRuleProcessor.cpp.
struct NS_STACK_CLASS RuleProcessorData {
RuleProcessorData(nsPresContext* aPresContext,
mozilla::dom::Element* aElement,
nsRuleWalker* aRuleWalker,
TreeMatchContext& aTreeMatchContext)
: mPresContext(aPresContext)
, mElement(aElement)
, mRuleWalker(aRuleWalker)
, mTreeMatchContext(aTreeMatchContext)
{
NS_ASSERTION(aElement, "null element leaked into SelectorMatches");
NS_ASSERTION(aElement->GetOwnerDoc(), "Document-less node here?");
NS_PRECONDITION(aTreeMatchContext.mForStyling == !!aRuleWalker,
"Should be styling if and only if we have a rule walker");
}
nsPresContext* const mPresContext;
mozilla::dom::Element* const mElement; // weak ref, must not be null
nsRuleWalker* const mRuleWalker; // Used to add rules to our results.
TreeMatchContext& mTreeMatchContext;
};
struct NS_STACK_CLASS ElementRuleProcessorData : public RuleProcessorData {
ElementRuleProcessorData(nsPresContext* aPresContext,
mozilla::dom::Element* aElement,
nsRuleWalker* aRuleWalker,
TreeMatchContext& aTreeMatchContext)
: RuleProcessorData(aPresContext, aElement, aRuleWalker, aTreeMatchContext)
{
NS_PRECONDITION(aPresContext, "null pointer");
NS_PRECONDITION(aRuleWalker, "null pointer");
NS_PRECONDITION(aTreeMatchContext.mForStyling, "Styling here!");
}
};
struct NS_STACK_CLASS PseudoElementRuleProcessorData : public RuleProcessorData {
PseudoElementRuleProcessorData(nsPresContext* aPresContext,
mozilla::dom::Element* aParentElement,
nsRuleWalker* aRuleWalker,
nsCSSPseudoElements::Type aPseudoType,
TreeMatchContext& aTreeMatchContext)
: RuleProcessorData(aPresContext, aParentElement, aRuleWalker,
aTreeMatchContext),
mPseudoType(aPseudoType)
{
NS_PRECONDITION(aPresContext, "null pointer");
NS_PRECONDITION(aPseudoType <
nsCSSPseudoElements::ePseudo_PseudoElementCount,
"null pointer");
NS_PRECONDITION(aRuleWalker, "null pointer");
NS_PRECONDITION(aTreeMatchContext.mForStyling, "Styling here!");
}
nsCSSPseudoElements::Type mPseudoType;
};
struct NS_STACK_CLASS AnonBoxRuleProcessorData {
AnonBoxRuleProcessorData(nsPresContext* aPresContext,
nsIAtom* aPseudoTag,
nsRuleWalker* aRuleWalker)
: mPresContext(aPresContext),
mPseudoTag(aPseudoTag),
mRuleWalker(aRuleWalker)
{
NS_PRECONDITION(mPresContext, "Must have prescontext");
NS_PRECONDITION(aPseudoTag, "Must have pseudo tag");
NS_PRECONDITION(aRuleWalker, "Must have rule walker");
}
nsPresContext* mPresContext;
nsIAtom* mPseudoTag;
nsRuleWalker* mRuleWalker;
};
#ifdef MOZ_XUL
struct NS_STACK_CLASS XULTreeRuleProcessorData : public RuleProcessorData {
XULTreeRuleProcessorData(nsPresContext* aPresContext,
mozilla::dom::Element* aParentElement,
nsRuleWalker* aRuleWalker,
nsIAtom* aPseudoTag,
nsICSSPseudoComparator* aComparator,
TreeMatchContext& aTreeMatchContext)
: RuleProcessorData(aPresContext, aParentElement, aRuleWalker,
aTreeMatchContext),
mPseudoTag(aPseudoTag),
mComparator(aComparator)
{
NS_PRECONDITION(aPresContext, "null pointer");
NS_PRECONDITION(aPseudoTag, "null pointer");
NS_PRECONDITION(aRuleWalker, "null pointer");
NS_PRECONDITION(aComparator, "must have a comparator");
NS_PRECONDITION(aTreeMatchContext.mForStyling, "Styling here!");
}
nsIAtom* mPseudoTag;
nsICSSPseudoComparator* mComparator;
};
#endif
struct NS_STACK_CLASS StateRuleProcessorData : public RuleProcessorData {
StateRuleProcessorData(nsPresContext* aPresContext,
mozilla::dom::Element* aElement,
nsEventStates aStateMask,
TreeMatchContext& aTreeMatchContext)
: RuleProcessorData(aPresContext, aElement, nsnull, aTreeMatchContext),
mStateMask(aStateMask)
{
NS_PRECONDITION(aPresContext, "null pointer");
NS_PRECONDITION(!aTreeMatchContext.mForStyling, "Not styling here!");
}
const nsEventStates mStateMask; // |HasStateDependentStyle| for which state(s)?
// Constants defined in nsEventStates.h .
};
struct NS_STACK_CLASS AttributeRuleProcessorData : public RuleProcessorData {
AttributeRuleProcessorData(nsPresContext* aPresContext,
mozilla::dom::Element* aElement,
nsIAtom* aAttribute,
PRInt32 aModType,
PRBool aAttrHasChanged,
TreeMatchContext& aTreeMatchContext)
: RuleProcessorData(aPresContext, aElement, nsnull, aTreeMatchContext),
mAttribute(aAttribute),
mModType(aModType),
mAttrHasChanged(aAttrHasChanged)
{
NS_PRECONDITION(aPresContext, "null pointer");
NS_PRECONDITION(!aTreeMatchContext.mForStyling, "Not styling here!");
}
nsIAtom* mAttribute; // |HasAttributeDependentStyle| for which attribute?
PRInt32 mModType; // The type of modification (see nsIDOMMutationEvent).
PRBool mAttrHasChanged; // Whether the attribute has already changed.
};
#endif /* !defined(nsRuleProcessorData_h_) */