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gecko-dev/layout/style/nsHTMLCSSStyleSheet.cpp

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/* -*- 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* 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 ***** */
/*
* style sheet and style rule processor representing style attributes
* and some additional overrides
*/
#include "nsIHTMLCSSStyleSheet.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "nsIURL.h"
#include "nsCSSPseudoElements.h"
#include "nsIStyleRule.h"
#include "nsIFrame.h"
#include "nsICSSStyleRule.h"
#include "nsIStyleRuleProcessor.h"
#include "nsPresContext.h"
#include "nsIDocument.h"
#include "nsCOMPtr.h"
#include "nsRuleWalker.h"
#include "nsRuleData.h"
/*
* The CSSFirstLetterRule and CSSFirstLineRule exist so that we can fix
* up the style data so that we don't have non-default values for the
* properties that don't apply to :first-letter and :first-line.
*
* CSSDisablePropsRule is a common base class for both the
* CSSFirstLetterRule and CSSFirstLineRule.
*/
class CSSDisablePropsRule : public nsIStyleRule {
public:
CSSDisablePropsRule();
virtual ~CSSDisablePropsRule();
NS_DECL_ISUPPORTS
// Call this something else so that this class still has pure virtual
// functions.
void CommonMapRuleInfoInto(nsRuleData* aRuleData);
#ifdef DEBUG
NS_IMETHOD List(FILE* out = stdout, PRInt32 aIndent = 0) const;
#endif
protected:
nsCSSValueList mInheritList;
nsCSSQuotes mInheritQuotes;
nsCSSCounterData mNoneCounter;
};
CSSDisablePropsRule::CSSDisablePropsRule()
{
nsCSSValue none(eCSSUnit_None);
mNoneCounter.mCounter = none;
nsCSSValue inherit(eCSSUnit_Inherit);
mInheritList.mValue = inherit;
mInheritQuotes.mOpen = inherit;
}
class CSSFirstLineRule : public CSSDisablePropsRule {
public:
CSSFirstLineRule() {}
NS_IMETHOD MapRuleInfoInto(nsRuleData* aRuleData);
};
class CSSFirstLetterRule : public CSSDisablePropsRule {
public:
CSSFirstLetterRule() {}
NS_IMETHOD MapRuleInfoInto(nsRuleData* aRuleData);
};
CSSDisablePropsRule::~CSSDisablePropsRule()
{
}
NS_IMPL_ISUPPORTS1(CSSDisablePropsRule, nsIStyleRule)
#ifdef DEBUG
NS_IMETHODIMP
CSSDisablePropsRule::List(FILE* out, PRInt32 aIndent) const
{
return NS_OK;
}
#endif
// -----------------------------------------------------------
/*
* Note: These rule mapping functions, unlike practically all others,
* will overwrite the properties even if they're not |eCSSUnit_Null|.
* XXX This is only a partial fix for the fact that they should be
* higher in the cascade (at the very top). It doesn't work in the case
* where something higher in the cascade fully specifies the struct.
*
* XXX This should be cleaned up once we implement eCSSUnit_Initial
* throughout.
*/
void
CSSDisablePropsRule::CommonMapRuleInfoInto(nsRuleData* aData)
{
/*
* Common code for disabling the properties that apply neither to
* :first-letter nor to :first-line.
*/
// Disable 'unicode-bidi'.
if (aData->mSID == eStyleStruct_TextReset) {
nsCSSValue normal(eCSSUnit_Normal);
aData->mTextData->mUnicodeBidi = normal;
}
// NOTE: 'text-align', 'text-indent', and 'white-space' should not be
// handled by the frames so we don't need to bother.
// Disable everything in the nsRuleDataDisplay struct except 'float'.
if (aData->mSID == eStyleStruct_Visibility) {
nsCSSValue inherit(eCSSUnit_Inherit);
aData->mDisplayData->mVisibility = inherit;
aData->mDisplayData->mDirection = inherit;
}
if (aData->mSID == eStyleStruct_Display) {
nsCSSValue none(eCSSUnit_None);
aData->mDisplayData->mAppearance = none;
nsCSSValue autovalue(eCSSUnit_Auto);
aData->mDisplayData->mClip.mTop = autovalue;
aData->mDisplayData->mClip.mRight = autovalue;
aData->mDisplayData->mClip.mBottom = autovalue;
aData->mDisplayData->mClip.mLeft = autovalue;
nsCSSValue one(1.0f, eCSSUnit_Number);
aData->mDisplayData->mOpacity = one;
nsCSSValue inlinevalue(NS_STYLE_DISPLAY_INLINE, eCSSUnit_Enumerated);
aData->mDisplayData->mDisplay = inlinevalue;
aData->mDisplayData->mBinding = none;
nsCSSValue staticposition(NS_STYLE_POSITION_STATIC, eCSSUnit_Enumerated);
aData->mDisplayData->mPosition = staticposition;
nsCSSValue visible(NS_STYLE_OVERFLOW_VISIBLE, eCSSUnit_Enumerated);
aData->mDisplayData->mOverflowX = visible;
aData->mDisplayData->mOverflowY = visible;
aData->mDisplayData->mClear = none;
// Nobody will care about 'break-before' or 'break-after', since
// they only apply to blocks (assuming we implement them correctly).
}
// NOTE: We'll never do anything with what's in nsCSSList,
// nsCSSTable, nsCSSBreaks, nsCSSPage, nsCSSAural, nsCSSXUL, or
// nsCSSSVG, so don't bother.
// Disable everything in the position struct.
if (aData->mSID == eStyleStruct_Position) {
nsCSSValue autovalue(eCSSUnit_Auto);
nsCSSValue none(eCSSUnit_None);
nsCSSValue zero(0.0f, eCSSUnit_Point);
aData->mPositionData->mOffset.mTop = autovalue;
aData->mPositionData->mOffset.mRight = autovalue;
aData->mPositionData->mOffset.mBottom = autovalue;
aData->mPositionData->mOffset.mLeft = autovalue;
aData->mPositionData->mWidth = autovalue;
aData->mPositionData->mMinWidth = zero;
aData->mPositionData->mMaxWidth = none;
aData->mPositionData->mHeight = autovalue;
aData->mPositionData->mMinHeight = zero;
aData->mPositionData->mMaxHeight = none;
nsCSSValue content(NS_STYLE_BOX_SIZING_CONTENT, eCSSUnit_Enumerated);
aData->mPositionData->mBoxSizing = content;
aData->mPositionData->mZIndex = autovalue;
}
// Disable everything in the Content struct.
if (aData->mSID == eStyleStruct_Content) {
// Don't bother resetting 'content'.
aData->mContentData->mCounterIncrement = &mNoneCounter;
aData->mContentData->mCounterReset = &mNoneCounter;
nsCSSValue autovalue(eCSSUnit_Auto);
aData->mContentData->mMarkerOffset = autovalue;
}
if (aData->mSID == eStyleStruct_Quotes) {
aData->mContentData->mQuotes = &mInheritQuotes;
}
// Disable everything in the UserInterface struct.
if (aData->mSID == eStyleStruct_UserInterface) {
nsCSSValue inherit(eCSSUnit_Inherit);
aData->mUserInterfaceData->mUserInput = inherit;
aData->mUserInterfaceData->mUserModify = inherit;
aData->mUserInterfaceData->mUserFocus = inherit;
aData->mUserInterfaceData->mCursor = &mInheritList;
}
if (aData->mSID == eStyleStruct_UIReset) {
nsCSSValue autovalue(eCSSUnit_Auto);
nsCSSValue none(eCSSUnit_None);
// Don't bother with '-moz-force-broken-image-icon' since it's only
// half a property.
// Don't bother with '-moz-user-select' because there's no way to
// specify the initial value.
}
// Disable all outline properties.
if (aData->mSID == eStyleStruct_Outline) {
nsCSSValue none(NS_STYLE_BORDER_STYLE_NONE, eCSSUnit_Enumerated);
aData->mMarginData->mOutlineStyle = none;
}
}
NS_IMETHODIMP
CSSFirstLineRule::MapRuleInfoInto(nsRuleData* aData)
{
/*
* See CSS2.1 section 5.12.1, which says that the properties that apply
* to :first-line are: font properties, color properties, background
* properties, 'word-spacing', 'letter-spacing', 'text-decoration',
* 'vertical-align', 'text-transform', and 'line-height'.
*
* We also allow 'text-shadow', which was listed in CSS2 (where the
* property existed).
*/
CommonMapRuleInfoInto(aData);
// Disable 'float'.
if (aData->mSID == eStyleStruct_Display) {
nsCSSValue none(eCSSUnit_None);
aData->mDisplayData->mFloat = none;
}
// Disable border properties, margin properties, and padding
// properties.
if (aData->mSID == eStyleStruct_Border) {
nsCSSValue none(NS_STYLE_BORDER_STYLE_NONE, eCSSUnit_Enumerated);
aData->mMarginData->mBorderStyle.mTop = none;
aData->mMarginData->mBorderStyle.mRight = none;
aData->mMarginData->mBorderStyle.mBottom = none;
aData->mMarginData->mBorderStyle.mLeft = none;
}
if (aData->mSID == eStyleStruct_Margin) {
nsCSSValue zero(0.0f, eCSSUnit_Point);
aData->mMarginData->mMargin.mTop = zero;
aData->mMarginData->mMargin.mRight = zero;
aData->mMarginData->mMargin.mBottom = zero;
aData->mMarginData->mMargin.mLeft = zero;
}
if (aData->mSID == eStyleStruct_Padding) {
nsCSSValue zero(0.0f, eCSSUnit_Point);
aData->mMarginData->mPadding.mTop = zero;
aData->mMarginData->mPadding.mRight = zero;
aData->mMarginData->mPadding.mBottom = zero;
aData->mMarginData->mPadding.mLeft = zero;
}
return NS_OK;
}
NS_IMETHODIMP
CSSFirstLetterRule::MapRuleInfoInto(nsRuleData* aData)
{
/*
* See CSS2.1 section 5.12.2, which says that the properties that
* apply to :first-letter are: font properties, 'text-decoration',
* 'text-transform', 'letter-spacing', 'word-spacing' (when
* appropriate), 'line-height', 'float', 'vertical-align' (only if
* 'float' is 'none'), margin properties, padding properties, border
* properties, 'color', and background properties.
*/
CommonMapRuleInfoInto(aData);
// NOTE: 'vertical-align' is only supposed to be relevant if 'float'
// is 'none', but we don't do anything with it if 'float' is not none,
// so we don't need to disable it.
return NS_OK;
}
// -----------------------------------------------------------
class HTMLCSSStyleSheetImpl : public nsIHTMLCSSStyleSheet,
public nsIStyleRuleProcessor {
public:
HTMLCSSStyleSheetImpl();
NS_DECL_ISUPPORTS
// basic style sheet data
NS_IMETHOD Init(nsIURI* aURL, nsIDocument* aDocument);
NS_IMETHOD Reset(nsIURI* aURL);
NS_IMETHOD GetSheetURI(nsIURI** aSheetURL) const;
NS_IMETHOD GetBaseURI(nsIURI** aBaseURL) const;
NS_IMETHOD GetTitle(nsString& aTitle) const;
NS_IMETHOD GetType(nsString& aType) const;
NS_IMETHOD_(PRBool) UseForMedium(nsPresContext* aPresContext) const;
NS_IMETHOD_(PRBool) HasRules() const;
NS_IMETHOD GetApplicable(PRBool& aApplicable) const;
NS_IMETHOD SetEnabled(PRBool aEnabled);
NS_IMETHOD GetComplete(PRBool& aComplete) const;
NS_IMETHOD SetComplete();
// style sheet owner info
NS_IMETHOD GetParentSheet(nsIStyleSheet*& aParent) const; // will be null
NS_IMETHOD GetOwningDocument(nsIDocument*& aDocument) const;
NS_IMETHOD SetOwningDocument(nsIDocument* aDocument);
// nsIStyleRuleProcessor api
NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData);
NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData);
NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
nsReStyleHint* aResult);
NS_IMETHOD HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
nsReStyleHint* aResult);
#ifdef DEBUG
virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
#endif
private:
// These are not supported and are not implemented!
HTMLCSSStyleSheetImpl(const HTMLCSSStyleSheetImpl& aCopy);
HTMLCSSStyleSheetImpl& operator=(const HTMLCSSStyleSheetImpl& aCopy);
protected:
virtual ~HTMLCSSStyleSheetImpl();
protected:
nsIURI* mURL;
nsIDocument* mDocument;
CSSFirstLineRule* mFirstLineRule;
CSSFirstLetterRule* mFirstLetterRule;
};
HTMLCSSStyleSheetImpl::HTMLCSSStyleSheetImpl()
: nsIHTMLCSSStyleSheet(),
mRefCnt(0),
mURL(nsnull),
mDocument(nsnull),
mFirstLineRule(nsnull),
mFirstLetterRule(nsnull)
{
}
HTMLCSSStyleSheetImpl::~HTMLCSSStyleSheetImpl()
{
NS_RELEASE(mURL);
NS_IF_RELEASE(mFirstLineRule);
NS_IF_RELEASE(mFirstLetterRule);
}
NS_IMPL_ISUPPORTS3(HTMLCSSStyleSheetImpl,
nsIHTMLCSSStyleSheet,
nsIStyleSheet,
nsIStyleRuleProcessor)
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::RulesMatching(ElementRuleProcessorData* aData)
{
nsIContent* content = aData->mContent;
if (content) {
// just get the one and only style rule from the content's STYLE attribute
nsICSSStyleRule* rule = content->GetInlineStyleRule();
if (rule)
aData->mRuleWalker->Forward(rule);
}
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::RulesMatching(PseudoRuleProcessorData* aData)
{
// We only want to add these rules if there are real :first-letter or
// :first-line rules that cause a pseudo-element frame to be created.
// Otherwise the use of ProbePseudoStyleContextFor will prevent frame
// creation, and adding rules here would cause it.
if (aData->mRuleWalker->AtRoot())
return NS_OK;
nsIAtom* pseudoTag = aData->mPseudoTag;
if (pseudoTag == nsCSSPseudoElements::firstLine) {
if (!mFirstLineRule) {
mFirstLineRule = new CSSFirstLineRule();
if (!mFirstLineRule)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(mFirstLineRule);
}
aData->mRuleWalker->Forward(mFirstLineRule);
}
else if (pseudoTag == nsCSSPseudoElements::firstLetter) {
if (!mFirstLetterRule) {
mFirstLetterRule = new CSSFirstLetterRule();
if (!mFirstLetterRule)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(mFirstLetterRule);
}
aData->mRuleWalker->Forward(mFirstLetterRule);
}
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::Init(nsIURI* aURL, nsIDocument* aDocument)
{
NS_PRECONDITION(aURL && aDocument, "null ptr");
if (! aURL || ! aDocument)
return NS_ERROR_NULL_POINTER;
if (mURL || mDocument)
return NS_ERROR_ALREADY_INITIALIZED;
mDocument = aDocument; // not refcounted!
mURL = aURL;
NS_ADDREF(mURL);
return NS_OK;
}
// Test if style is dependent on content state
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::HasStateDependentStyle(StateRuleProcessorData* aData,
nsReStyleHint* aResult)
{
*aResult = nsReStyleHint(0);
return NS_OK;
}
// Test if style is dependent on attribute
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
nsReStyleHint* aResult)
{
*aResult = nsReStyleHint(0);
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::Reset(nsIURI* aURL)
{
NS_IF_RELEASE(mURL);
mURL = aURL;
NS_ADDREF(mURL);
NS_IF_RELEASE(mFirstLineRule);
NS_IF_RELEASE(mFirstLetterRule);
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetSheetURI(nsIURI** aSheetURL) const
{
NS_IF_ADDREF(mURL);
*aSheetURL = mURL;
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetBaseURI(nsIURI** aBaseURL) const
{
NS_IF_ADDREF(mURL);
*aBaseURL = mURL;
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetTitle(nsString& aTitle) const
{
aTitle.AssignLiteral("Internal HTML/CSS Style Sheet");
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetType(nsString& aType) const
{
aType.AssignLiteral("text/html");
return NS_OK;
}
NS_IMETHODIMP_(PRBool)
HTMLCSSStyleSheetImpl::UseForMedium(nsPresContext* aPresContext) const
{
return PR_TRUE; // works for all media
}
NS_IMETHODIMP_(PRBool)
HTMLCSSStyleSheetImpl::HasRules() const
{
return PR_TRUE; // We always have rules, since mFirstLineRule and
// mFirstLetterRule are created on request.
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetApplicable(PRBool& aApplicable) const
{
aApplicable = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::SetEnabled(PRBool aEnabled)
{ // these can't be disabled
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetComplete(PRBool& aComplete) const
{
aComplete = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::SetComplete()
{
return NS_OK;
}
// style sheet owner info
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetParentSheet(nsIStyleSheet*& aParent) const
{
aParent = nsnull;
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::GetOwningDocument(nsIDocument*& aDocument) const
{
NS_IF_ADDREF(mDocument);
aDocument = mDocument;
return NS_OK;
}
NS_IMETHODIMP
HTMLCSSStyleSheetImpl::SetOwningDocument(nsIDocument* aDocument)
{
mDocument = aDocument;
return NS_OK;
}
#ifdef DEBUG
void HTMLCSSStyleSheetImpl::List(FILE* out, PRInt32 aIndent) const
{
// Indent
for (PRInt32 index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("HTML CSS Style Sheet: ", out);
nsCAutoString urlSpec;
mURL->GetSpec(urlSpec);
if (!urlSpec.IsEmpty()) {
fputs(urlSpec.get(), out);
}
fputs("\n", out);
}
#endif
// XXX For backwards compatibility and convenience
nsresult
NS_NewHTMLCSSStyleSheet(nsIHTMLCSSStyleSheet** aInstancePtrResult,
nsIURI* aURL, nsIDocument* aDocument)
{
nsresult rv;
nsIHTMLCSSStyleSheet* sheet;
if (NS_FAILED(rv = NS_NewHTMLCSSStyleSheet(&sheet)))
return rv;
if (NS_FAILED(rv = sheet->Init(aURL, aDocument))) {
NS_RELEASE(sheet);
return rv;
}
*aInstancePtrResult = sheet;
return NS_OK;
}
nsresult
NS_NewHTMLCSSStyleSheet(nsIHTMLCSSStyleSheet** aInstancePtrResult)
{
if (aInstancePtrResult == nsnull) {
return NS_ERROR_NULL_POINTER;
}
HTMLCSSStyleSheetImpl* it = new HTMLCSSStyleSheetImpl();
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(it);
*aInstancePtrResult = it;
return NS_OK;
}
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