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cssstyleselector.cpp
4369 lines (3999 loc) · 162 KB
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cssstyleselector.cpp
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/**
* This file is part of the CSS implementation for KDE.
*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004 Apple Computer, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "css/cssstyleselector.h"
#include "rendering/render_style.h"
#include "css/css_stylesheetimpl.h"
#include "css/css_ruleimpl.h"
#include "css/css_valueimpl.h"
#include "css/csshelper.h"
#include "rendering/render_object.h"
#include "html/html_documentimpl.h"
#include "html/html_elementimpl.h"
#include "xml/dom_elementimpl.h"
#include "dom/css_rule.h"
#include "dom/css_value.h"
#include "khtml_factory.h"
#include "khtmlpart_p.h"
#include "css/cssproperties.h"
#include "css/cssvalues.h"
#include "misc/khtmllayout.h"
#include "khtml_settings.h"
#include "misc/helper.h"
#include "misc/loader.h"
#include "rendering/font.h"
#include "render_theme.h"
#include "khtmlview.h"
#include "khtml_part.h"
#include <kstandarddirs.h>
#include <kcharsets.h>
#include <kglobal.h>
#include <qfile.h>
#include <qfontdatabase.h>
#include <qfontinfo.h>
#include <qvaluelist.h>
#include <qstring.h>
#include <kdebug.h>
#include <kurl.h>
#include <qdatetime.h>
#include <assert.h>
#include <qpaintdevicemetrics.h>
#include <qintcache.h>
#include <stdlib.h>
#include <kxmlcore/HashMap.h>
using namespace DOM;
using namespace HTMLNames;
// #define STYLE_SHARING_STATS 1
#define HANDLE_INHERIT(prop, Prop) \
if (isInherit) \
{\
style->set##Prop(parentStyle->prop());\
return;\
}
#define HANDLE_INHERIT_AND_INITIAL(prop, Prop) \
HANDLE_INHERIT(prop, Prop) \
else if (isInitial) \
{\
style->set##Prop(RenderStyle::initial##Prop());\
return;\
}
#define HANDLE_INHERIT_AND_INITIAL_WITH_VALUE(prop, Prop, Value) \
HANDLE_INHERIT(prop, Prop) \
else if (isInitial) \
{\
style->set##Prop(RenderStyle::initial##Value());\
return;\
}
#define HANDLE_BACKGROUND_INHERIT_AND_INITIAL(prop, Prop) \
if (isInherit) { \
BackgroundLayer* currChild = style->accessBackgroundLayers(); \
BackgroundLayer* prevChild = 0; \
const BackgroundLayer* currParent = parentStyle->backgroundLayers(); \
while (currParent && currParent->is##Prop##Set()) { \
if (!currChild) { \
/* Need to make a new layer.*/ \
currChild = new BackgroundLayer(); \
prevChild->setNext(currChild); \
} \
currChild->set##Prop(currParent->prop()); \
prevChild = currChild; \
currChild = prevChild->next(); \
currParent = currParent->next(); \
} \
\
while (currChild) { \
/* Reset any remaining layers to not have the property set. */ \
currChild->clear##Prop(); \
currChild = currChild->next(); \
} \
return; \
} \
if (isInitial) { \
BackgroundLayer* currChild = style->accessBackgroundLayers(); \
currChild->set##Prop(RenderStyle::initial##Prop()); \
for (currChild = currChild->next(); currChild; currChild = currChild->next()) \
currChild->clear##Prop(); \
return; \
}
#define HANDLE_BACKGROUND_VALUE(prop, Prop, value) { \
HANDLE_BACKGROUND_INHERIT_AND_INITIAL(prop, Prop) \
if (!value->isPrimitiveValue() && !value->isValueList()) \
return; \
BackgroundLayer* currChild = style->accessBackgroundLayers(); \
BackgroundLayer* prevChild = 0; \
if (value->isPrimitiveValue()) { \
map##Prop(currChild, value); \
currChild = currChild->next(); \
} \
else { \
/* Walk each value and put it into a layer, creating new layers as needed. */ \
CSSValueListImpl* valueList = static_cast<CSSValueListImpl*>(value); \
for (unsigned int i = 0; i < valueList->length(); i++) { \
if (!currChild) { \
/* Need to make a new layer to hold this value */ \
currChild = new BackgroundLayer(); \
prevChild->setNext(currChild); \
} \
map##Prop(currChild, valueList->item(i)); \
prevChild = currChild; \
currChild = currChild->next(); \
} \
} \
while (currChild) { \
/* Reset all remaining layers to not have the property set. */ \
currChild->clear##Prop(); \
currChild = currChild->next(); \
} }
#define HANDLE_INHERIT_COND(propID, prop, Prop) \
if (id == propID) \
{\
style->set##Prop(parentStyle->prop());\
return;\
}
#define HANDLE_INITIAL_COND(propID, Prop) \
if (id == propID) \
{\
style->set##Prop(RenderStyle::initial##Prop());\
return;\
}
#define HANDLE_INITIAL_COND_WITH_VALUE(propID, Prop, Value) \
if (id == propID) \
{\
style->set##Prop(RenderStyle::initial##Value());\
return;\
}
namespace khtml {
class CSSRuleSet
{
public:
CSSRuleSet();
~CSSRuleSet();
typedef HashMap<DOM::DOMStringImpl *, CSSRuleDataList *, PointerHash<DOM::DOMStringImpl *> > AtomRuleMap;
void addRulesFromSheet(DOM::CSSStyleSheetImpl* sheet, const DOM::DOMString &medium = "screen");
void addRule(DOM::CSSStyleRuleImpl* rule, DOM::CSSSelector* sel);
void addToRuleSet(DOM::DOMStringImpl* key, AtomRuleMap& map,
DOM::CSSStyleRuleImpl* rule, DOM::CSSSelector* sel);
CSSRuleDataList* getIDRules(DOM::DOMStringImpl* key) { return m_idRules.get(key); }
CSSRuleDataList* getClassRules(DOM::DOMStringImpl* key) { return m_classRules.get(key); }
CSSRuleDataList* getTagRules(DOM::DOMStringImpl* key) { return m_tagRules.get(key); }
CSSRuleDataList* getUniversalRules() { return m_universalRules; }
public:
AtomRuleMap m_idRules;
AtomRuleMap m_classRules;
AtomRuleMap m_tagRules;
CSSRuleDataList* m_universalRules;
uint m_ruleCount;
};
CSSRuleSet *CSSStyleSelector::defaultStyle = 0;
CSSRuleSet *CSSStyleSelector::defaultQuirksStyle = 0;
CSSRuleSet *CSSStyleSelector::defaultPrintStyle = 0;
CSSStyleSheetImpl *CSSStyleSelector::defaultSheet = 0;
RenderStyle* CSSStyleSelector::styleNotYetAvailable = 0;
CSSStyleSheetImpl *CSSStyleSelector::quirksSheet = 0;
static CSSStyleSelector::Encodedurl *currentEncodedURL = 0;
static PseudoState pseudoState;
CSSStyleSelector::CSSStyleSelector( DocumentImpl* doc, QString userStyleSheet, StyleSheetListImpl *styleSheets,
bool _strictParsing )
{
init();
view = doc->view();
strictParsing = _strictParsing;
settings = view ? view->part()->settings() : 0;
if(!defaultStyle) loadDefaultStyle(settings);
m_medium = view ? view->mediaType() : QString("all");
m_userStyle = 0;
m_userSheet = 0;
paintDeviceMetrics = doc->paintDeviceMetrics();
// FIXME: This sucks! The user sheet is reparsed every time!
if (!userStyleSheet.isEmpty()) {
m_userSheet = new CSSStyleSheetImpl(doc);
m_userSheet->parseString(DOMString(userStyleSheet), strictParsing);
m_userStyle = new CSSRuleSet();
m_userStyle->addRulesFromSheet( m_userSheet, m_medium );
}
// add stylesheets from document
m_authorStyle = new CSSRuleSet();
QPtrListIterator<StyleSheetImpl> it(styleSheets->styleSheets);
for (; it.current(); ++it)
if (it.current()->isCSSStyleSheet())
m_authorStyle->addRulesFromSheet(static_cast<CSSStyleSheetImpl*>(it.current()), m_medium);
//kdDebug( 6080 ) << "number of style sheets in document " << authorStyleSheets.count() << endl;
//kdDebug( 6080 ) << "CSSStyleSelector: author style has " << authorStyle->count() << " elements"<< endl;
}
CSSStyleSelector::CSSStyleSelector( CSSStyleSheetImpl *sheet )
{
init();
if(!defaultStyle) loadDefaultStyle();
KHTMLView *view = sheet->doc()->view();
m_medium = view ? view->mediaType() : QString("all");
m_authorStyle = new CSSRuleSet();
m_authorStyle->addRulesFromSheet( sheet, m_medium );
}
void CSSStyleSelector::init()
{
element = 0;
settings = 0;
paintDeviceMetrics = 0;
m_matchedRuleCount = m_matchedDeclCount = m_tmpRuleCount = 0;
}
void CSSStyleSelector::setEncodedURL(const KURL& url)
{
KURL u = url;
u.setQuery( QString::null );
u.setRef( QString::null );
encodedurl.file = u.url();
int pos = encodedurl.file.findRev('/');
encodedurl.path = encodedurl.file;
if ( pos > 0 ) {
encodedurl.path.truncate( pos );
encodedurl.path += '/';
}
u.setPath( QString::null );
encodedurl.host = u.url();
//kdDebug() << "CSSStyleSelector::CSSStyleSelector encoded url " << encodedurl.path << endl;
}
CSSStyleSelector::~CSSStyleSelector()
{
delete m_authorStyle;
delete m_userStyle;
delete m_userSheet;
}
static CSSStyleSheetImpl* parseUASheet(const KHTMLSettings* s, const char* sheetName)
{
QFile f(locate( "data", sheetName));
f.open(IO_ReadOnly);
QCString file(f.size() + 1);
int readbytes = f.readBlock(file.data(), f.size());
f.close();
if (readbytes >= 0)
file[readbytes] = '\0';
QString style = QString::fromLatin1(file.data());
if (s)
style += s->settingsToCSS();
DOMString str(style);
CSSStyleSheetImpl* sheet = new CSSStyleSheetImpl((CSSStyleSheetImpl*)0);
sheet->parseString(str);
return sheet;
}
void CSSStyleSelector::loadDefaultStyle(const KHTMLSettings *s)
{
if(defaultStyle) return;
defaultSheet = parseUASheet(s, "khtml/css/html4.css");
// Collect only strict-mode rules.
defaultStyle = new CSSRuleSet();
defaultStyle->addRulesFromSheet(defaultSheet, "screen");
defaultPrintStyle = new CSSRuleSet();
defaultPrintStyle->addRulesFromSheet(defaultSheet, "print");
// Collect only quirks-mode rules.
quirksSheet = parseUASheet(0, "khtml/css/quirks.css");
defaultQuirksStyle = new CSSRuleSet();
defaultQuirksStyle->addRulesFromSheet(quirksSheet, "screen");
}
void CSSStyleSelector::addMatchedRule(CSSRuleData* rule)
{
if (m_matchedRules.size() <= m_matchedRuleCount)
m_matchedRules.resize(2*m_matchedRules.size()+1);
m_matchedRules[m_matchedRuleCount++] = rule;
}
void CSSStyleSelector::addMatchedDeclaration(CSSMutableStyleDeclarationImpl* decl)
{
if (m_matchedDecls.size() <= m_matchedDeclCount)
m_matchedDecls.resize(2*m_matchedDecls.size()+1);
m_matchedDecls[m_matchedDeclCount++] = decl;
}
void CSSStyleSelector::matchRules(CSSRuleSet* rules, int& firstRuleIndex, int& lastRuleIndex)
{
m_matchedRuleCount = 0;
firstRuleIndex = lastRuleIndex = -1;
if (!rules || !element) return;
// We need to collect the rules for id, class, tag, and everything else into a buffer and
// then sort the buffer.
if (element->hasID())
matchRulesForList(rules->getIDRules(element->getIDAttribute().impl()), firstRuleIndex, lastRuleIndex);
if (element->hasClass())
for (const AtomicStringList* singleClass = element->getClassList(); singleClass; singleClass = singleClass->next())
matchRulesForList(rules->getClassRules(singleClass->string().impl()), firstRuleIndex, lastRuleIndex);
matchRulesForList(rules->getTagRules(element->localName().impl()),
firstRuleIndex, lastRuleIndex);
matchRulesForList(rules->getUniversalRules(), firstRuleIndex, lastRuleIndex);
// If we didn't match any rules, we're done.
if (m_matchedRuleCount == 0) return;
// Sort the set of matched rules.
sortMatchedRules(0, m_matchedRuleCount);
// Now transfer the set of matched rules over to our list of decls.
for (unsigned i = 0; i < m_matchedRuleCount; i++)
addMatchedDeclaration(m_matchedRules[i]->rule()->declaration());
}
void CSSStyleSelector::matchRulesForList(CSSRuleDataList* rules,
int& firstRuleIndex, int& lastRuleIndex)
{
if (!rules) return;
for (CSSRuleData* d = rules->first(); d; d = d->next()) {
CSSStyleRuleImpl* rule = d->rule();
const AtomicString& localName = element->localName();
const AtomicString& selectorLocalName = d->selector()->tag.localName();
if ((localName == selectorLocalName || selectorLocalName == starAtom) && checkSelector(d->selector(), element)) {
// If the rule has no properties to apply, then ignore it.
CSSMutableStyleDeclarationImpl* decl = rule->declaration();
if (!decl || !decl->length()) continue;
// If we're matching normal rules, set a pseudo bit if
// we really just matched a pseudo-element.
if (dynamicPseudo != RenderStyle::NOPSEUDO && pseudoStyle == RenderStyle::NOPSEUDO)
style->setHasPseudoStyle(dynamicPseudo);
else {
// Update our first/last rule indices in the matched rules array.
lastRuleIndex = m_matchedDeclCount + m_matchedRuleCount;
if (firstRuleIndex == -1) firstRuleIndex = m_matchedDeclCount + m_matchedRuleCount;
// Add this rule to our list of matched rules.
addMatchedRule(d);
}
}
}
}
bool operator >(CSSRuleData& r1, CSSRuleData& r2)
{
int spec1 = r1.selector()->specificity();
int spec2 = r2.selector()->specificity();
return (spec1 == spec2) ? r1.position() > r2.position() : spec1 > spec2;
}
bool operator <=(CSSRuleData& r1, CSSRuleData& r2)
{
return !(r1 > r2);
}
void CSSStyleSelector::sortMatchedRules(uint start, uint end)
{
if (start >= end || (end-start == 1))
return; // Sanity check.
if (end - start <= 6) {
// Apply a bubble sort for smaller lists.
for (uint i = end-1; i > start; i--) {
bool sorted = true;
for (uint j = start; j < i; j++) {
CSSRuleData* elt = m_matchedRules[j];
CSSRuleData* elt2 = m_matchedRules[j+1];
if (*elt > *elt2) {
sorted = false;
m_matchedRules[j] = elt2;
m_matchedRules[j+1] = elt;
}
}
if (sorted)
return;
}
}
else {
// Peform a merge sort for larger lists.
uint mid = (start+end)/2;
sortMatchedRules(start, mid);
sortMatchedRules(mid, end);
CSSRuleData* elt = m_matchedRules[mid-1];
CSSRuleData* elt2 = m_matchedRules[mid];
// Handle the fast common case (of equal specificity). The list may already
// be completely sorted.
if (*elt <= *elt2)
return;
// We have to merge sort. Ensure our merge buffer is big enough to hold
// all the items.
m_tmpRules.resize(end - start);
uint i1 = start;
uint i2 = mid;
elt = m_matchedRules[i1];
elt2 = m_matchedRules[i2];
while (i1 < mid || i2 < end) {
if (i1 < mid && (i2 == end || *elt <= *elt2)) {
m_tmpRules[m_tmpRuleCount++] = elt;
i1++;
if (i1 < mid)
elt = m_matchedRules[i1];
}
else {
m_tmpRules[m_tmpRuleCount++] = elt2;
i2++;
if (i2 < end)
elt2 = m_matchedRules[i2];
}
}
for (uint i = start; i < end; i++)
m_matchedRules[i] = m_tmpRules[i-start];
m_tmpRuleCount = 0;
}
}
void CSSStyleSelector::initElementAndPseudoState(ElementImpl* e)
{
element = e;
if (element && element->isStyledElement())
styledElement = static_cast<StyledElementImpl*>(element);
else
styledElement = 0;
currentEncodedURL = &encodedurl;
pseudoState = PseudoUnknown;
}
void CSSStyleSelector::initForStyleResolve(ElementImpl* e, RenderStyle* defaultParent)
{
// set some variables we will need
pseudoStyle = RenderStyle::NOPSEUDO;
parentNode = e->parentNode();
if (defaultParent)
parentStyle = defaultParent;
else
parentStyle = (parentNode && parentNode->renderer()) ? parentNode->renderer()->style() : 0;
view = element->getDocument()->view();
isXMLDoc = !element->getDocument()->isHTMLDocument();
part = element->getDocument()->part();
settings = part ? part->settings() : 0;
paintDeviceMetrics = element->getDocument()->paintDeviceMetrics();
style = 0;
m_matchedRuleCount = 0;
m_matchedDeclCount = 0;
m_tmpRuleCount = 0;
fontDirty = false;
}
// modified version of the one in kurl.cpp
static void cleanpath(QString &path)
{
int pos;
while ( (pos = path.find( "/../" )) != -1 ) {
int prev = 0;
if ( pos > 0 )
prev = path.findRev( "/", pos -1 );
// don't remove the host, i.e. http://foo.org/../foo.html
if (prev < 0 || (prev > 3 && path.findRev("://", prev-1) == prev-2))
path.remove( pos, 3);
else
// matching directory found ?
path.remove( prev, pos- prev + 3 );
}
pos = 0;
// Don't remove "//" from an anchor identifier. -rjw
// Set refPos to -2 to mean "I haven't looked for the anchor yet".
// We don't want to waste a function call on the search for the the anchor
// in the vast majority of cases where there is no "//" in the path.
int refPos = -2;
while ( (pos = path.find( "//", pos )) != -1) {
if (refPos == -2)
refPos = path.find("#", 0);
if (refPos > 0 && pos >= refPos)
break;
if ( pos == 0 || path[pos-1] != ':' )
path.remove( pos, 1 );
else
pos += 2;
}
while ( (pos = path.find( "/./" )) != -1)
path.remove( pos, 2 );
//kdDebug() << "checkPseudoState " << path << endl;
}
static void checkPseudoState( ElementImpl *e, bool checkVisited = true )
{
if (!e->isLink()) {
pseudoState = PseudoNone;
return;
}
const AtomicString& attr = e->getAttribute(hrefAttr);
if (attr.isNull()) {
pseudoState = PseudoNone;
return;
}
if (!checkVisited) {
pseudoState = PseudoAnyLink;
return;
}
QConstString cu(attr.unicode(), attr.length());
QString u = cu.string();
if ( !u.contains("://") ) {
if ( u[0] == '/' )
u.prepend(currentEncodedURL->host);
else if ( u[0] == '#' )
u.prepend(currentEncodedURL->file);
else
u.prepend(currentEncodedURL->path);
cleanpath( u );
}
//completeURL( attr.qstring() );
pseudoState = KHTMLFactory::vLinks()->contains( u ) ? PseudoVisited : PseudoLink;
}
#ifdef STYLE_SHARING_STATS
static int fraction = 0;
static int total = 0;
#endif
const int siblingThreshold = 10;
NodeImpl* CSSStyleSelector::locateCousinList(ElementImpl* parent)
{
if (parent && parent->isHTMLElement()) {
HTMLElementImpl* p = static_cast<HTMLElementImpl*>(parent);
if (p->renderer() && !p->inlineStyleDecl() && !p->hasID()) {
NodeImpl* r = p->previousSibling();
int subcount = 0;
RenderStyle* st = p->renderer()->style();
while (r) {
if (r->renderer() && r->renderer()->style() == st)
return r->lastChild();
if (subcount++ == siblingThreshold)
return 0;
r = r->previousSibling();
}
if (!r)
r = locateCousinList(static_cast<ElementImpl*>(parent->parentNode()));
while (r) {
if (r->renderer() && r->renderer()->style() == st)
return r->lastChild();
if (subcount++ == siblingThreshold)
return 0;
r = r->previousSibling();
}
}
}
return 0;
}
bool CSSStyleSelector::canShareStyleWithElement(NodeImpl* n)
{
if (n->isStyledElement()) {
StyledElementImpl* s = static_cast<StyledElementImpl*>(n);
if (s->renderer() && (s->tagName() == element->tagName()) && !s->hasID() &&
(s->hasClass() == element->hasClass()) && !s->inlineStyleDecl() &&
(s->hasMappedAttributes() == styledElement->hasMappedAttributes()) &&
(s->isLink() == element->isLink()) &&
!s->renderer()->style()->affectedByAttributeSelectors() &&
(s->hovered() == element->hovered()) &&
(s->active() == element->active()) &&
(s->focused() == element->focused())) {
bool classesMatch = true;
if (s->hasClass()) {
const AtomicString& class1 = element->getAttribute(classAttr);
const AtomicString& class2 = s->getAttribute(classAttr);
classesMatch = (class1 == class2);
}
if (classesMatch) {
bool mappedAttrsMatch = true;
if (s->hasMappedAttributes())
mappedAttrsMatch = s->mappedAttributes()->mapsEquivalent(styledElement->mappedAttributes());
if (mappedAttrsMatch) {
bool linksMatch = true;
if (s->isLink()) {
// We need to check to see if the visited state matches.
QColor linkColor = element->getDocument()->linkColor();
QColor visitedColor = element->getDocument()->visitedLinkColor();
if (pseudoState == PseudoUnknown)
checkPseudoState(element, s->renderer()->style()->pseudoState() != PseudoAnyLink ||
linkColor != visitedColor);
linksMatch = (pseudoState == s->renderer()->style()->pseudoState());
}
if (linksMatch)
return true;
}
}
}
}
return false;
}
RenderStyle* CSSStyleSelector::locateSharedStyle()
{
if (styledElement && !styledElement->inlineStyleDecl() && !styledElement->hasID() &&
!styledElement->getDocument()->usesSiblingRules()) {
// Check previous siblings.
int count = 0;
NodeImpl* n;
for (n = element->previousSibling(); n && !n->isElementNode(); n = n->previousSibling());
while (n) {
if (canShareStyleWithElement(n))
return n->renderer()->style();
if (count++ == siblingThreshold)
return 0;
for (n = n->previousSibling(); n && !n->isElementNode(); n = n->previousSibling());
}
if (!n)
n = locateCousinList(static_cast<ElementImpl*>(element->parentNode()));
while (n) {
if (canShareStyleWithElement(n))
return n->renderer()->style();
if (count++ == siblingThreshold)
return 0;
for (n = n->previousSibling(); n && !n->isElementNode(); n = n->previousSibling());
}
}
return 0;
}
RenderStyle* CSSStyleSelector::styleForElement(ElementImpl* e, RenderStyle* defaultParent, bool allowSharing)
{
if (!e->getDocument()->haveStylesheetsLoaded()) {
if (!styleNotYetAvailable) {
styleNotYetAvailable = ::new RenderStyle();
styleNotYetAvailable->setDisplay(NONE);
styleNotYetAvailable->ref();
}
return styleNotYetAvailable;
}
initElementAndPseudoState(e);
if (allowSharing) {
style = locateSharedStyle();
#ifdef STYLE_SHARING_STATS
fraction += style != 0;
total++;
printf("Sharing %d out of %d\n", fraction, total);
#endif
if (style)
return style;
}
initForStyleResolve(e, defaultParent);
style = new (e->getDocument()->renderArena()) RenderStyle();
if (parentStyle)
style->inheritFrom(parentStyle);
else
parentStyle = style;
// 1. First we match rules from the user agent sheet.
int firstUARule = -1, lastUARule = -1;
matchRules(defaultStyle, firstUARule, lastUARule);
// 2. In quirks mode, we match rules from the quirks user agent sheet.
if (!strictParsing)
matchRules(defaultQuirksStyle, firstUARule, lastUARule);
// 3. If our medium is print, then we match rules from the print sheet.
if (m_medium == "print")
matchRules(defaultPrintStyle, firstUARule, lastUARule);
// 4. Now we check user sheet rules.
int firstUserRule = -1, lastUserRule = -1;
matchRules(m_userStyle, firstUserRule, lastUserRule);
// 5. Now check author rules, beginning first with presentational attributes
// mapped from HTML.
int firstAuthorRule = -1, lastAuthorRule = -1;
if (styledElement) {
// Ask if the HTML element has mapped attributes.
if (styledElement->hasMappedAttributes()) {
// Walk our attribute list and add in each decl.
const NamedMappedAttrMapImpl* map = styledElement->mappedAttributes();
for (uint i = 0; i < map->length(); i++) {
MappedAttributeImpl* attr = map->attributeItem(i);
if (attr->decl()) {
if (firstAuthorRule == -1) firstAuthorRule = m_matchedDeclCount;
lastAuthorRule = m_matchedDeclCount;
addMatchedDeclaration(attr->decl());
}
}
}
// Now we check additional mapped declarations.
// Tables and table cells share an additional mapped rule that must be applied
// after all attributes, since their mapped style depends on the values of multiple attributes.
CSSMutableStyleDeclarationImpl* attributeDecl = styledElement->additionalAttributeStyleDecl();
if (attributeDecl) {
if (firstAuthorRule == -1) firstAuthorRule = m_matchedDeclCount;
lastAuthorRule = m_matchedDeclCount;
addMatchedDeclaration(attributeDecl);
}
}
// 6. Check the rules in author sheets next.
matchRules(m_authorStyle, firstAuthorRule, lastAuthorRule);
// 7. Now check our inline style attribute.
if (styledElement) {
CSSMutableStyleDeclarationImpl* inlineDecl = styledElement->inlineStyleDecl();
if (inlineDecl) {
if (firstAuthorRule == -1) firstAuthorRule = m_matchedDeclCount;
lastAuthorRule = m_matchedDeclCount;
addMatchedDeclaration(inlineDecl);
}
}
// Now we have all of the matched rules in the appropriate order. Walk the rules and apply
// high-priority properties first, i.e., those properties that other properties depend on.
// The order is (1) high-priority not important, (2) high-priority important, (3) normal not important
// and (4) normal important.
applyDeclarations(true, false, 0, m_matchedDeclCount-1);
applyDeclarations(true, true, firstAuthorRule, lastAuthorRule);
applyDeclarations(true, true, firstUserRule, lastUserRule);
applyDeclarations(true, true, firstUARule, lastUARule);
// If our font got dirtied, go ahead and update it now.
if (fontDirty) {
checkForTextSizeAdjust();
checkForGenericFamilyChange(style, parentStyle);
style->htmlFont().update(paintDeviceMetrics);
fontDirty = false;
}
// Now do the normal priority properties.
applyDeclarations(false, false, 0, m_matchedDeclCount-1);
applyDeclarations(false, true, firstAuthorRule, lastAuthorRule);
applyDeclarations(false, true, firstUserRule, lastUserRule);
applyDeclarations(false, true, firstUARule, lastUARule);
// If our font got dirtied by one of the non-essential font props,
// go ahead and update it a second time.
if (fontDirty) {
checkForTextSizeAdjust();
checkForGenericFamilyChange(style, parentStyle);
style->htmlFont().update(paintDeviceMetrics);
fontDirty = false;
}
// Clean up our style object's display and text decorations (among other fixups).
adjustRenderStyle(style, e);
// If we are a link, cache the determined pseudo-state.
if (e->isLink())
style->setPseudoState(pseudoState);
// Now return the style.
return style;
}
RenderStyle* CSSStyleSelector::pseudoStyleForElement(RenderStyle::PseudoId pseudo,
ElementImpl* e, RenderStyle* parentStyle)
{
if (!e)
return 0;
initElementAndPseudoState(e);
initForStyleResolve(e, parentStyle);
pseudoStyle = pseudo;
// Since we don't use pseudo-elements in any of our quirk/print user agent rules, don't waste time walking
// those rules.
// Check UA, user and author rules.
int firstUARule = -1, lastUARule = -1, firstUserRule = -1, lastUserRule = -1, firstAuthorRule = -1, lastAuthorRule = -1;
matchRules(defaultStyle, firstUARule, lastUARule);
matchRules(m_userStyle, firstUserRule, lastUserRule);
matchRules(m_authorStyle, firstAuthorRule, lastAuthorRule);
if (m_matchedDeclCount == 0)
return 0;
style = new (e->getDocument()->renderArena()) RenderStyle();
if (parentStyle)
style->inheritFrom(parentStyle);
else
parentStyle = style;
style->noninherited_flags._styleType = pseudoStyle;
// High-priority properties.
applyDeclarations(true, false, 0, m_matchedDeclCount-1);
applyDeclarations(true, true, firstAuthorRule, lastAuthorRule);
applyDeclarations(true, true, firstUserRule, lastUserRule);
applyDeclarations(true, true, firstUARule, lastUARule);
// If our font got dirtied, go ahead and update it now.
if (fontDirty) {
checkForTextSizeAdjust();
checkForGenericFamilyChange(style, parentStyle);
style->htmlFont().update(paintDeviceMetrics);
fontDirty = false;
}
// Now do the normal priority properties.
applyDeclarations(false, false, 0, m_matchedDeclCount-1);
applyDeclarations(false, true, firstAuthorRule, lastAuthorRule);
applyDeclarations(false, true, firstUserRule, lastUserRule);
applyDeclarations(false, true, firstUARule, lastUARule);
// If our font got dirtied by one of the non-essential font props,
// go ahead and update it a second time.
if (fontDirty) {
checkForTextSizeAdjust();
checkForGenericFamilyChange(style, parentStyle);
style->htmlFont().update(paintDeviceMetrics);
fontDirty = false;
}
// Clean up our style object's display and text decorations (among other fixups).
adjustRenderStyle(style, 0);
// Now return the style.
return style;
}
void CSSStyleSelector::adjustRenderStyle(RenderStyle* style, ElementImpl *e)
{
// Cache our original display.
style->setOriginalDisplay(style->display());
if (style->display() != NONE) {
// If we have a <td> that specifies a float property, in quirks mode we just drop the float
// property.
// Sites also commonly use display:inline/block on <td>s and <table>s. In quirks mode we force
// these tags to retain their display types.
if (!strictParsing && e) {
if (e->hasTagName(tdTag)) {
style->setDisplay(TABLE_CELL);
style->setFloating(FNONE);
}
else if (e->hasTagName(tableTag))
style->setDisplay(style->isDisplayInlineType() ? INLINE_TABLE : TABLE);
}
// Frames and framesets never honor position:relative or position:absolute. This is necessary to
// fix a crash where a site tries to position these objects. They also never honor display.
if (e && (e->hasTagName(frameTag) || e->hasTagName(framesetTag))) {
style->setPosition(STATIC);
style->setDisplay(BLOCK);
}
// Table headers with a text-align of auto will change the text-align to center.
if (e && e->hasTagName(thTag) && style->textAlign() == TAAUTO)
style->setTextAlign(CENTER);
// Mutate the display to BLOCK or TABLE for certain cases, e.g., if someone attempts to
// position or float an inline, compact, or run-in. Cache the original display, since it
// may be needed for positioned elements that have to compute their static normal flow
// positions. We also force inline-level roots to be block-level.
if (style->display() != BLOCK && style->display() != TABLE && style->display() != BOX &&
(style->position() == ABSOLUTE || style->position() == FIXED || style->floating() != FNONE ||
(e && e->getDocument()->documentElement() == e))) {
if (style->display() == INLINE_TABLE)
style->setDisplay(TABLE);
else if (style->display() == INLINE_BOX)
style->setDisplay(BOX);
else if (style->display() == LIST_ITEM) {
// It is a WinIE bug that floated list items lose their bullets, so we'll emulate the quirk,
// but only in quirks mode.
if (!strictParsing && style->floating() != FNONE)
style->setDisplay(BLOCK);
}
else
style->setDisplay(BLOCK);
}
// After performing the display mutation, check table rows. We do not honor position:relative on
// table rows or cells. This has been established in CSS2.1 (and caused a crash in containingBlock()
// on some sites).
if ((style->display() == TABLE_ROW || style->display() == TABLE_CELL) && style->position() == RELATIVE)
style->setPosition(STATIC);
}
// Make sure our z-index value is only applied if the object is positioned,
// relatively positioned, or transparent.
if (style->position() == STATIC && style->opacity() == 1.0f) {
if (e && e->getDocument()->documentElement() == e)
style->setZIndex(0); // The root has a z-index of 0 if not positioned or transparent.
else
style->setHasAutoZIndex(); // Everyone else gets an auto z-index.
}
// Auto z-index becomes 0 for transparent objects. This prevents cases where
// objects that should be blended as a single unit end up with a non-transparent object
// wedged in between them.
if (style->opacity() < 1.0f && style->hasAutoZIndex())
style->setZIndex(0);
// Button, legend, input, select and textarea all consider width values of 'auto' to be 'intrinsic'.
// This will be important when we use block flows for all form controls.
if (e && (e->hasTagName(legendTag) || e->hasTagName(buttonTag) || e->hasTagName(inputTag) ||
e->hasTagName(selectTag) || e->hasTagName(textareaTag))) {
if (style->width().isAuto())
style->setWidth(Length(Intrinsic));
}
// Finally update our text decorations in effect, but don't allow text-decoration to percolate through
// tables, inline blocks, inline tables, or run-ins.
if (style->display() == TABLE || style->display() == INLINE_TABLE || style->display() == RUN_IN
|| style->display() == INLINE_BLOCK || style->display() == INLINE_BOX)
style->setTextDecorationsInEffect(style->textDecoration());
else
style->addToTextDecorationsInEffect(style->textDecoration());
// Cull out any useless layers and also repeat patterns into additional layers.
style->adjustBackgroundLayers();
// Let the theme get a crack at changing the style if an appearance has been set.
if (style->hasAppearance())
theme()->adjustStyle(this, style, e);
// Only use slow repaints if we actually have a background image.