pjs/layout/style/nsIStyleRuleProcessor.h

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#ifndef nsIStyleRuleProcessor_h___
#define nsIStyleRuleProcessor_h___

#include <stdio.h>

#include "nsISupports.h"
#include "nsPresContext.h" // for nsCompatability
#include "nsILinkHandler.h"
#include "nsString.h"
#include "nsChangeHint.h"

class nsIStyleSheet;
class nsPresContext;
class nsIContent;
class nsIStyledContent;
class nsISupportsArray;
class nsIAtom;
class nsICSSPseudoComparator;
class nsRuleWalker;

// The implementation of the constructor and destructor are currently in
// nsCSSStyleSheet.cpp.

struct RuleProcessorData {
  RuleProcessorData(nsPresContext* aPresContext,
                    nsIContent* aContent, 
                    nsRuleWalker* aRuleWalker,
                    nsCompatibility* aCompat = nsnull);
  
  // NOTE: not |virtual|
  ~RuleProcessorData();

  void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
    return aContext->AllocateFromShell(sz);
  }
  void Destroy(nsPresContext* aContext) {
    this->~RuleProcessorData();
    aContext->FreeToShell(sizeof(RuleProcessorData), this);
  };

  const nsString* GetLang();

  nsPresContext*   mPresContext;
  nsIContent*       mContent;       // weak ref
  nsIContent*       mParentContent; // if content, content->GetParent(); weak ref
  nsRuleWalker*     mRuleWalker; // Used to add rules to our results.
  nsIContent*       mScopedRoot;    // Root of scoped stylesheet (set and unset by the supplier of the scoped stylesheet
  
  nsIAtom*          mContentTag;    // if content, then content->GetTag()
  nsIAtom*          mContentID;     // if styled content, then styledcontent->GetID()
  nsIStyledContent* mStyledContent; // if content, content->QI(nsIStyledContent)
  PRPackedBool      mIsHTMLContent; // if content, then does QI on HTMLContent, true or false
  PRPackedBool      mIsHTMLLink;    // if content, calls nsStyleUtil::IsHTMLLink
  PRPackedBool      mIsSimpleXLink; // if content, calls nsStyleUtil::IsSimpleXLink
  nsCompatibility   mCompatMode;    // Possibly remove use of this in SelectorMatches?
  PRPackedBool      mHasAttributes; // if content, content->GetAttrCount() > 0
  PRPackedBool      mIsChecked;     // checked/selected attribute for option and select elements
  nsLinkState       mLinkState;     // if a link, this is the state, otherwise unknown
  PRInt32           mEventState;    // if content, eventStateMgr->GetContentState()
  PRInt32           mNameSpaceID;   // if content, content->GetNameSapce()
  RuleProcessorData* mPreviousSiblingData;
  RuleProcessorData* mParentData;

protected:
  nsAutoString *mLanguage; // NULL means we haven't found out the language yet
};

struct ElementRuleProcessorData : public RuleProcessorData {
  ElementRuleProcessorData(nsPresContext* aPresContext,
                           nsIContent* aContent, 
                           nsRuleWalker* aRuleWalker)
  : RuleProcessorData(aPresContext,aContent,aRuleWalker)
  {
    NS_PRECONDITION(aContent, "null pointer");
    NS_PRECONDITION(aRuleWalker, "null pointer");
  }
};

struct PseudoRuleProcessorData : public RuleProcessorData {
  PseudoRuleProcessorData(nsPresContext* aPresContext,
                          nsIContent* aParentContent,
                          nsIAtom* aPseudoTag,
                          nsICSSPseudoComparator* aComparator,
                          nsRuleWalker* aRuleWalker)
  : RuleProcessorData(aPresContext, aParentContent, aRuleWalker)
  {
    NS_PRECONDITION(aPseudoTag, "null pointer");
    NS_PRECONDITION(aRuleWalker, "null pointer");
    mPseudoTag = aPseudoTag;
    mComparator = aComparator;
  }

  nsIAtom*                 mPseudoTag;
  nsICSSPseudoComparator*  mComparator;
};

struct StateRuleProcessorData : public RuleProcessorData {
  StateRuleProcessorData(nsPresContext* aPresContext,
                         nsIContent* aContent,
                         PRInt32 aStateMask)
    : RuleProcessorData(aPresContext, aContent, nsnull),
      mStateMask(aStateMask)
  {
    NS_PRECONDITION(aContent, "null pointer");
  }
  const PRInt32 mStateMask; // |HasStateDependentStyle| for which state(s)?
                            //  Constants defined in nsIEventStateManager.h .
};

struct AttributeRuleProcessorData : public RuleProcessorData {
  AttributeRuleProcessorData(nsPresContext* aPresContext,
                         nsIContent* aContent,
                         nsIAtom* aAttribute,
                         PRInt32 aModType)
    : RuleProcessorData(aPresContext, aContent, nsnull),
      mAttribute(aAttribute),
      mModType(aModType)
  {
    NS_PRECONDITION(aContent, "null pointer");
  }
  nsIAtom* mAttribute; // |HasAttributeDependentStyle| for which attribute?
  PRInt32 mModType;    // The type of modification (see nsIDOMMutationEvent).
};


// IID for the nsIStyleRuleProcessor interface {015575fe-7b6c-11d3-ba05-001083023c2b}
#define NS_ISTYLE_RULE_PROCESSOR_IID     \
{0x015575fe, 0x7b6c, 0x11d3, {0xba, 0x05, 0x00, 0x10, 0x83, 0x02, 0x3c, 0x2b}}

/* The style rule processor interface is a mechanism to separate the matching
 * of style rules from style sheet instances.
 * Simple style sheets can and will act as their own processor. 
 * Sheets where rule ordering interlaces between multiple sheets, will need to 
 * share a single rule processor between them (CSS sheets do this for cascading order)
 */
class nsIStyleRuleProcessor : public nsISupports {
public:
  NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_PROCESSOR_IID)

  // Shorthand for:
  //  nsCOMArray<nsIStyleRuleProcessor>::nsCOMArrayEnumFunc
  typedef PRBool (* PR_CALLBACK EnumFunc)(nsIStyleRuleProcessor*, void*);

  // populate rule node tree with nsIStyleRule*
  // rules are ordered, those with higher precedence are farthest from the root of the tree
  NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData) = 0;

  NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData) = 0;

  /**
   * Test whether style is dependent on content state.  This test is
   * used for optimization only, and may err on the side of reporting
   * more dependencies than really exist.
   *
   * Event states are defined in nsIEventStateManager.h.
   */
  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
                                    nsReStyleHint* aResult) = 0;

  /**
   * Test whether style is dependent the presence or value of an
   * attribute.  This test is used for optimization only, and may err on
   * the side of reporting more dependencies than really exist.
   */
  NS_IMETHOD HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
                                        nsReStyleHint* aResult) = 0;
};

#endif /* nsIStyleRuleProcessor_h___ */