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nsMappedAttributes.h
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00002 /* ***** BEGIN LICENSE BLOCK *****
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00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
00018  * IBM Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2004
00020  * IBM Corporation. All Rights Reserved.
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00022  * Contributor(s):
00023  *   IBM Corporation
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00025  * Alternatively, the contents of this file may be used under the terms of
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00038 
00039 #ifndef nsMappedAttributes_h___
00040 #define nsMappedAttributes_h___
00041 
00042 #include "nsAttrAndChildArray.h"
00043 #include "nsGenericHTMLElement.h"
00044 #include "nsIStyleRule.h"
00045 
00046 class nsIAtom;
00047 class nsHTMLStyleSheet;
00048 class nsRuleWalker;
00049 
00050 class nsMappedAttributes : public nsIStyleRule
00051 {
00052 public:
00053   nsMappedAttributes(nsHTMLStyleSheet* aSheet,
00054                      nsMapRuleToAttributesFunc aMapRuleFunc);
00055 
00056   void* operator new(size_t size, PRUint32 aAttrCount = 1) CPP_THROW_NEW;
00057 
00058   nsMappedAttributes* Clone(PRBool aWillAddAttr);
00059 
00060   NS_DECL_ISUPPORTS
00061 
00062   nsresult SetAndTakeAttr(nsIAtom* aAttrName, nsAttrValue& aValue);
00063   const nsAttrValue* GetAttr(nsIAtom* aAttrName) const;
00064 
00065   PRUint32 Count() const
00066   {
00067     return mAttrCount;
00068   }
00069 
00070   PRBool Equals(const nsMappedAttributes* aAttributes) const;
00071   PRUint32 HashValue() const;
00072 
00073   void DropStyleSheetReference()
00074   {
00075     mSheet = nsnull;
00076   }
00077   void SetStyleSheet(nsHTMLStyleSheet* aSheet);
00078   nsHTMLStyleSheet* GetStyleSheet()
00079   {
00080     return mSheet;
00081   }
00082 
00083   const nsAttrName* NameAt(PRUint32 aPos) const
00084   {
00085     NS_ASSERTION(aPos < mAttrCount, "out-of-bounds");
00086     return &Attrs()[aPos].mName;
00087   }
00088   const nsAttrValue* AttrAt(PRUint32 aPos) const
00089   {
00090     NS_ASSERTION(aPos < mAttrCount, "out-of-bounds");
00091     return &Attrs()[aPos].mValue;
00092   }
00093   // Remove the attr at position aPos.  The value of the attr is placed in
00094   // aValue; any value that was already in aValue is destroyed.
00095   void RemoveAttrAt(PRUint32 aPos, nsAttrValue& aValue);
00096   const nsAttrName* GetExistingAttrNameFromQName(const nsACString& aName) const;
00097   PRInt32 IndexOfAttr(nsIAtom* aLocalName, PRInt32 aNamespaceID) const;
00098   
00099 
00100   // nsIStyleRule 
00101   NS_IMETHOD MapRuleInfoInto(nsRuleData* aRuleData);
00102 #ifdef DEBUG
00103   NS_METHOD List(FILE* out = stdout, PRInt32 aIndent = 0) const;
00104 #endif
00105 
00106 private:
00107   nsMappedAttributes(const nsMappedAttributes& aCopy);
00108   ~nsMappedAttributes();
00109 
00110   struct InternalAttr
00111   {
00112     nsAttrName mName;
00113     nsAttrValue mValue;
00114   };
00115 
00123   const InternalAttr* Attrs() const
00124   {
00125     return NS_REINTERPRET_CAST(const InternalAttr*, &(mAttrs[0]));
00126   }
00127   InternalAttr* Attrs()
00128   {
00129     return NS_REINTERPRET_CAST(InternalAttr*, &(mAttrs[0]));
00130   }
00131 
00132   PRUint16 mAttrCount;
00133 #ifdef DEBUG
00134   PRUint16 mBufferSize;
00135 #endif
00136   nsHTMLStyleSheet* mSheet; //weak
00137   nsMapRuleToAttributesFunc mRuleMapper;
00138   void* mAttrs[1];
00139 };
00140 
00141 #endif /* nsMappedAttributes_h___ */