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365 lines
10 KiB
C++
365 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsICSSStyleSheet.h"
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#include "nsIArena.h"
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#include "nsCRT.h"
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#include "nsIAtom.h"
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#include "nsIURL.h"
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#include "nsISupportsArray.h"
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#include "nsICSSStyleRule.h"
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#include "nsIHTMLContent.h"
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#include "nsIFrame.h"
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#include "nsString.h"
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static NS_DEFINE_IID(kICSSStyleSheetIID, NS_ICSS_STYLE_SHEET_IID);
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static NS_DEFINE_IID(kIStyleSheetIID, NS_ISTYLE_SHEET_IID);
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static NS_DEFINE_IID(kIStyleRuleIID, NS_ISTYLE_RULE_IID);
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static NS_DEFINE_IID(kIHTMLContentIID, NS_IHTMLCONTENT_IID);
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class CSSStyleSheetImpl : public nsICSSStyleSheet {
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public:
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void* operator new(size_t size);
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void* operator new(size_t size, nsIArena* aArena);
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void operator delete(void* ptr);
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CSSStyleSheetImpl(nsIURL* aURL);
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NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
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NS_IMETHOD_(nsrefcnt) AddRef();
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NS_IMETHOD_(nsrefcnt) Release();
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virtual PRBool SelectorMatches(nsCSSSelector* aSelector,
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nsIContent* aContent);
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virtual PRInt32 RulesMatching(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParentFrame,
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nsISupportsArray* aResults);
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virtual nsIURL* GetURL(void);
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virtual PRBool ContainsStyleSheet(nsIURL* aURL);
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virtual void AppendStyleSheet(nsICSSStyleSheet* aSheet);
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// XXX do these belong here or are they generic?
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virtual void PrependStyleRule(nsICSSStyleRule* aRule);
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virtual void AppendStyleRule(nsICSSStyleRule* aRule);
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// XXX style rule enumerations
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virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
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private:
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// These are not supported and are not implemented!
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CSSStyleSheetImpl(const CSSStyleSheetImpl& aCopy);
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CSSStyleSheetImpl& operator=(const CSSStyleSheetImpl& aCopy);
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protected:
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virtual ~CSSStyleSheetImpl();
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protected:
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PRUint32 mInHeap : 1;
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PRUint32 mRefCnt : 31;
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nsIURL* mURL;
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CSSStyleSheetImpl* mFirstChild;
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nsISupportsArray* mRules;
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CSSStyleSheetImpl* mNext;
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};
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void* CSSStyleSheetImpl::operator new(size_t size)
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{
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CSSStyleSheetImpl* rv = (CSSStyleSheetImpl*) ::operator new(size);
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#ifdef NS_DEBUG
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if (nsnull != rv) {
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nsCRT::memset(rv, 0xEE, size);
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}
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#endif
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rv->mInHeap = 1;
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return (void*) rv;
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}
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void* CSSStyleSheetImpl::operator new(size_t size, nsIArena* aArena)
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{
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CSSStyleSheetImpl* rv = (CSSStyleSheetImpl*) aArena->Alloc(PRInt32(size));
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#ifdef NS_DEBUG
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if (nsnull != rv) {
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nsCRT::memset(rv, 0xEE, size);
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}
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#endif
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rv->mInHeap = 0;
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return (void*) rv;
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}
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void CSSStyleSheetImpl::operator delete(void* ptr)
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{
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CSSStyleSheetImpl* sheet = (CSSStyleSheetImpl*) ptr;
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if (nsnull != sheet) {
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if (sheet->mInHeap) {
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::delete ptr;
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}
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}
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}
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CSSStyleSheetImpl::CSSStyleSheetImpl(nsIURL* aURL)
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: nsICSSStyleSheet(),
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mURL(aURL), mFirstChild(nsnull), mRules(nsnull), mNext(nsnull)
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{
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NS_INIT_REFCNT();
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NS_ADDREF(mURL);
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}
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CSSStyleSheetImpl::~CSSStyleSheetImpl()
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{
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NS_RELEASE(mURL);
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NS_IF_RELEASE(mFirstChild);
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NS_IF_RELEASE(mRules);
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NS_IF_RELEASE(mNext);
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}
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NS_IMPL_ADDREF(CSSStyleSheetImpl)
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NS_IMPL_RELEASE(CSSStyleSheetImpl)
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nsresult CSSStyleSheetImpl::QueryInterface(const nsIID& aIID,
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void** aInstancePtrResult)
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{
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NS_PRECONDITION(nsnull != aInstancePtrResult, "null pointer");
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if (nsnull == aInstancePtrResult) {
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return NS_ERROR_NULL_POINTER;
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}
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
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if (aIID.Equals(kICSSStyleSheetIID)) {
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*aInstancePtrResult = (void*) ((nsICSSStyleSheet*)this);
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AddRef();
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return NS_OK;
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}
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if (aIID.Equals(kIStyleSheetIID)) {
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*aInstancePtrResult = (void*) ((nsIStyleSheet*)this);
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AddRef();
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return NS_OK;
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}
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if (aIID.Equals(kISupportsIID)) {
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*aInstancePtrResult = (void*) ((nsISupports*)this);
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AddRef();
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return NS_OK;
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}
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return NS_NOINTERFACE;
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}
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PRBool CSSStyleSheetImpl::SelectorMatches(nsCSSSelector* aSelector, nsIContent* aContent)
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{
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PRBool result = PR_FALSE;
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if ((nsnull == aSelector->mTag) || (aSelector->mTag == aContent->GetTag())) {
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if ((nsnull != aSelector->mClass) || (nsnull != aSelector->mTag)) {
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nsIHTMLContent* htmlContent;
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if (NS_OK == aContent->QueryInterface(kIHTMLContentIID, (void**)&htmlContent)) {
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if ((nsnull == aSelector->mClass) || (aSelector->mClass == htmlContent->GetClass())) {
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if ((nsnull == aSelector->mID) || (aSelector->mID == htmlContent->GetID())) {
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result = PR_TRUE;
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}
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}
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NS_RELEASE(htmlContent);
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}
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}
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else {
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result = PR_TRUE;
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}
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}
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return result;
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}
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PRInt32 CSSStyleSheetImpl::RulesMatching(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParentFrame,
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nsISupportsArray* aResults)
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{
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NS_PRECONDITION(nsnull != aPresContext, "null arg");
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NS_PRECONDITION(nsnull != aContent, "null arg");
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// NS_PRECONDITION(nsnull != aParentFrame, "null arg");
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NS_PRECONDITION(nsnull != aResults, "null arg");
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PRInt32 matchCount = 0;
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CSSStyleSheetImpl* child = mFirstChild;
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while (nsnull != child) {
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matchCount += child->RulesMatching(aPresContext, aContent, aParentFrame, aResults);
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child = child->mNext;
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}
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PRInt32 count = ((nsnull != mRules) ? mRules->Count() : 0);
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for (PRInt32 index = 0; index < count; index++) {
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nsICSSStyleRule* rule = (nsICSSStyleRule*)mRules->ElementAt(index);
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nsCSSSelector* selector = rule->FirstSelector();
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if (SelectorMatches(selector, aContent)) {
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selector = selector->mNext;
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nsIFrame* frame = aParentFrame;
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while ((nsnull != selector) && (nsnull != frame)) { // check compound selectors
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nsIContent* content;
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frame->GetContent(content);
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if (SelectorMatches(selector, content)) {
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selector = selector->mNext;
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}
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frame->GetGeometricParent(frame);
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NS_RELEASE(content);
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}
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if (nsnull == selector) { // ran out, it matched
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nsIStyleRule* iRule;
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if (NS_OK == rule->QueryInterface(kIStyleRuleIID, (void**)&iRule)) {
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aResults->AppendElement(iRule);
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NS_RELEASE(iRule);
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matchCount++;
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}
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}
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}
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NS_RELEASE(rule);
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}
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return matchCount;
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}
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nsIURL* CSSStyleSheetImpl::GetURL(void)
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{
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NS_ADDREF(mURL);
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return mURL;
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}
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PRBool CSSStyleSheetImpl::ContainsStyleSheet(nsIURL* aURL)
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{
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NS_PRECONDITION(nsnull != aURL, "null arg");
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PRBool result = (*mURL == *aURL);
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CSSStyleSheetImpl* child = mFirstChild;
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while ((PR_FALSE == result) && (nsnull != child)) {
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result = child->ContainsStyleSheet(aURL);
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child = child->mNext;
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}
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return result;
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}
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void CSSStyleSheetImpl::AppendStyleSheet(nsICSSStyleSheet* aSheet)
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{
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NS_PRECONDITION(nsnull != aSheet, "null arg");
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if (nsnull == mFirstChild) {
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mFirstChild = (CSSStyleSheetImpl*)aSheet;
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}
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else {
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CSSStyleSheetImpl* child = mFirstChild;
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while (nsnull != child->mNext) {
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child = child->mNext;
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}
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child->mNext = (CSSStyleSheetImpl*)aSheet;
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}
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NS_ADDREF(aSheet);
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}
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void CSSStyleSheetImpl::PrependStyleRule(nsICSSStyleRule* aRule)
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{
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NS_PRECONDITION(nsnull != aRule, "null arg");
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//XXX replace this with a binary search?
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PRInt32 weight = aRule->GetWeight();
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if (nsnull == mRules) {
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if (NS_OK != NS_NewISupportsArray(&mRules))
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return;
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}
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PRInt32 index = mRules->Count();
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while (0 <= --index) {
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nsICSSStyleRule* rule = (nsICSSStyleRule*)mRules->ElementAt(index);
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if (rule->GetWeight() > weight) { // insert before rules with equal or lesser weight
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NS_RELEASE(rule);
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break;
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}
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NS_RELEASE(rule);
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}
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mRules->InsertElementAt(aRule, index + 1);
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}
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void CSSStyleSheetImpl::AppendStyleRule(nsICSSStyleRule* aRule)
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{
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NS_PRECONDITION(nsnull != aRule, "null arg");
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//XXX replace this with a binary search?
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PRInt32 weight = aRule->GetWeight();
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if (nsnull == mRules) {
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if (NS_OK != NS_NewISupportsArray(&mRules))
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return;
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}
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PRInt32 count = mRules->Count();
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PRInt32 index = -1;
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while (++index < count) {
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nsICSSStyleRule* rule = (nsICSSStyleRule*)mRules->ElementAt(index);
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if (rule->GetWeight() < weight) { // insert after rules with equal or greater weight (before lower weight)
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NS_RELEASE(rule);
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break;
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}
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NS_RELEASE(rule);
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}
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mRules->InsertElementAt(aRule, index);
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}
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void CSSStyleSheetImpl::List(FILE* out, PRInt32 aIndent) const
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{
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nsAutoString buffer;
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PRInt32 index;
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// Indent
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for (index = aIndent; --index >= 0; ) fputs(" ", out);
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fputs("CSS Style Sheet: ", out);
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mURL->ToString(buffer);
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fputs(buffer, out);
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fputs("\n", out);
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CSSStyleSheetImpl* child = mFirstChild;
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while (nsnull != child) {
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child->List(out, aIndent + 1);
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child = child->mNext;
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}
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PRInt32 count = ((nsnull != mRules) ? mRules->Count() : 0);
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for (index = 0; index < count; index++) {
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nsICSSStyleRule* rule = (nsICSSStyleRule*)mRules->ElementAt(index);
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rule->List(out, aIndent);
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NS_RELEASE(rule);
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}
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}
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NS_HTML nsresult
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NS_NewCSSStyleSheet(nsICSSStyleSheet** aInstancePtrResult, nsIURL* aURL)
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{
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if (aInstancePtrResult == nsnull) {
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return NS_ERROR_NULL_POINTER;
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}
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CSSStyleSheetImpl *it = new CSSStyleSheetImpl(aURL);
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(kICSSStyleSheetIID, (void **) aInstancePtrResult);
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}
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