/* -*- 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): * Daniel Glazman * * 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 ***** */ /* * representation of a declaration block (or style attribute) in a CSS * stylesheet */ #ifndef mozilla_css_Declaration_h #define mozilla_css_Declaration_h // This header is in EXPORTS because it's used in several places in content/, // but it's not really a public interface. #ifndef _IMPL_NS_LAYOUT #error "This file should only be included within the layout library" #endif #include "nsISupports.h" #include "nsColor.h" #include #include "nsString.h" #include "nsCoord.h" #include "nsCSSValue.h" #include "nsCSSProps.h" #include "nsTArray.h" #include "nsCSSDataBlock.h" #include "nsCSSStruct.h" // must be forward-declared in root namespace class CSSStyleRuleImpl; namespace mozilla { namespace css { class Declaration { public: /** * Construct an |Declaration| that is in an invalid state (null * |mData|) and cannot be used until its |CompressFrom| method or * |InitializeEmpty| method is called. */ Declaration(); Declaration(const Declaration& aCopy); /** * |ValueAppended| must be called to maintain this declaration's * |mOrder| whenever a property is parsed into an expanded data block * for this declaration. aProperty must not be a shorthand. */ void ValueAppended(nsCSSProperty aProperty); void RemoveProperty(nsCSSProperty aProperty); void GetValue(nsCSSProperty aProperty, nsAString& aValue) const; PRBool HasImportantData() const { return mImportantData != nsnull; } PRBool GetValueIsImportant(nsCSSProperty aProperty) const; PRBool GetValueIsImportant(const nsAString& aProperty) const; PRUint32 Count() const { return mOrder.Length(); } void GetNthProperty(PRUint32 aIndex, nsAString& aReturn) const; void ToString(nsAString& aString) const; Declaration* Clone() const; nsCSSCompressedDataBlock* GetNormalBlock() const { return mData; } nsCSSCompressedDataBlock* GetImportantBlock() const { return mImportantData; } /** * Initialize this declaration as holding no data. Cannot fail. */ void InitializeEmpty(); /** * Transfer all of the state from |aExpandedData| into this declaration. * After calling, |aExpandedData| should be in its initial state. */ void CompressFrom(nsCSSExpandedDataBlock *aExpandedData) { NS_ASSERTION(!mData, "oops"); NS_ASSERTION(!mImportantData, "oops"); aExpandedData->Compress(getter_AddRefs(mData), getter_AddRefs(mImportantData)); aExpandedData->AssertInitialState(); } /** * Transfer all of the state from this declaration into * |aExpandedData| and put this declaration temporarily into an * invalid state (ended by |CompressFrom| or |InitializeEmpty|) that * should last only during parsing. During this time only * |ValueAppended| should be called. */ void ExpandTo(nsCSSExpandedDataBlock *aExpandedData) { AssertMutable(); aExpandedData->AssertInitialState(); NS_ASSERTION(mData, "oops"); aExpandedData->Expand(&mData, &mImportantData); NS_ASSERTION(!mData && !mImportantData, "Expand didn't null things out"); } /** * Return a pointer to our current value for this property. * Only returns non-null if the property is longhand, set, and * has the indicated importance level. * * May only be called when not expanded, and the caller must call * EnsureMutable first. */ void* SlotForValue(nsCSSProperty aProperty, PRBool aIsImportant) { AssertMutable(); NS_ABORT_IF_FALSE(mData, "called while expanded"); if (nsCSSProps::IsShorthand(aProperty)) { return nsnull; } nsCSSCompressedDataBlock *block = aIsImportant ? mImportantData : mData; // mImportantData might be null if (!block) { return nsnull; } void *slot = block->SlotForValue(aProperty); #ifdef DEBUG { nsCSSCompressedDataBlock *other = aIsImportant ? mData : mImportantData; NS_ABORT_IF_FALSE(!slot || !other || !other->StorageFor(aProperty), "Property both important and not?"); } #endif return slot; } PRBool HasNonImportantValueFor(nsCSSProperty aProperty) const { NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty), "must be longhand"); return !!mData->StorageFor(aProperty); } /** * Copy |this|, if necessary to ensure that it can be modified. */ Declaration* EnsureMutable(); /** * Crash if |this| is not mutable. */ void AssertMutable() const { NS_ABORT_IF_FALSE(IsMutable(), "someone forgot to call EnsureMutable"); } /** * Clear the data, in preparation for its replacement with entirely * new data by a call to |CompressFrom|. */ void ClearData() { AssertMutable(); mData = nsnull; mImportantData = nsnull; mOrder.Clear(); } #ifdef DEBUG void List(FILE* out = stdout, PRInt32 aIndent = 0) const; #endif private: // Not implemented, and not supported. Declaration& operator=(const Declaration& aCopy); PRBool operator==(const Declaration& aCopy) const; static void AppendImportanceToString(PRBool aIsImportant, nsAString& aString); // return whether there was a value in |aValue| (i.e., it had a non-null unit) PRBool AppendValueToString(nsCSSProperty aProperty, nsAString& aResult) const; // Helper for ToString with strange semantics regarding aValue. void AppendPropertyAndValueToString(nsCSSProperty aProperty, nsAutoString& aValue, nsAString& aResult) const; private: // // Specialized ref counting. // We do not want everyone to ref count us, only the rules which hold // onto us (our well defined lifetime is when the last rule releases // us). // It's worth a comment here that the main css::Declaration is // refcounted, but its |mImportant| is not refcounted, just owned // by the non-important declaration. // friend class ::CSSStyleRuleImpl; void AddRef(void) { if (mRefCnt == PR_UINT32_MAX) { NS_WARNING("refcount overflow, leaking object"); return; } ++mRefCnt; } void Release(void) { if (mRefCnt == PR_UINT32_MAX) { NS_WARNING("refcount overflow, leaking object"); return; } NS_ASSERTION(0 < mRefCnt, "bad Release"); if (0 == --mRefCnt) { delete this; } } public: void RuleAbort(void) { NS_ASSERTION(0 == mRefCnt, "bad RuleAbort"); delete this; } private: // Block everyone, except us or a derivative, from deleting us. ~Declaration(); nsCSSProperty OrderValueAt(PRUint32 aValue) const { return nsCSSProperty(mOrder.ElementAt(aValue)); } private: bool IsMutable() const { return ((!mData || mData->IsMutable()) && (!mImportantData || mImportantData->IsMutable())); } nsAutoTArray mOrder; nsAutoRefCnt mRefCnt; // never null, except while expanded nsRefPtr mData; // may be null nsRefPtr mImportantData; }; } // namespace css } // namespace mozilla #endif /* mozilla_css_Declaration_h */