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/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CSSStyleSheet.h"
#include "CSSImportRule.h"
#include "CSSNamespace.h"
#include "CSSParser.h"
#include "CSSRuleList.h"
#include "Document.h"
#include "ExceptionCode.h"
#include "HTMLNames.h"
#include "Node.h"
#include "SVGNames.h"
#include "SecurityOrigin.h"
#include "TextEncoding.h"
#include <wtf/Deque.h>
namespace WebCore {
#if !ASSERT_DISABLED
static bool isAcceptableCSSStyleSheetParent(Node* parentNode)
{
// Only these nodes can be parents of StyleSheets, and they need to call clearOwnerNode() when moved out of document.
return !parentNode
|| parentNode->isDocumentNode()
|| parentNode->hasTagName(HTMLNames::linkTag)
|| parentNode->hasTagName(HTMLNames::styleTag)
#if ENABLE(SVG)
|| parentNode->hasTagName(SVGNames::styleTag)
#endif
|| parentNode->nodeType() == Node::PROCESSING_INSTRUCTION_NODE;
}
#endif
CSSStyleSheet::CSSStyleSheet(CSSStyleSheet* parentSheet, const String& href, const KURL& baseURL, const String& charset)
: StyleSheet(parentSheet, href, baseURL)
, m_charset(charset)
, m_loadCompleted(false)
, m_strictParsing(!parentSheet || parentSheet->useStrictParsing())
, m_isUserStyleSheet(parentSheet ? parentSheet->isUserStyleSheet() : false)
, m_hasSyntacticallyValidCSSHeader(true)
{
}
CSSStyleSheet::CSSStyleSheet(Node* parentNode, const String& href, const KURL& baseURL, const String& charset)
: StyleSheet(parentNode, href, baseURL)
, m_charset(charset)
, m_loadCompleted(false)
, m_strictParsing(false)
, m_isUserStyleSheet(false)
, m_hasSyntacticallyValidCSSHeader(true)
{
ASSERT(isAcceptableCSSStyleSheetParent(parentNode));
}
CSSStyleSheet::CSSStyleSheet(CSSRule* ownerRule, const String& href, const KURL& baseURL, const String& charset)
: StyleSheet(ownerRule, href, baseURL)
, m_charset(charset)
, m_loadCompleted(false)
, m_strictParsing(!ownerRule || ownerRule->useStrictParsing())
, m_hasSyntacticallyValidCSSHeader(true)
{
CSSStyleSheet* parentSheet = ownerRule ? ownerRule->parentStyleSheet() : 0;
m_isUserStyleSheet = parentSheet ? parentSheet->isUserStyleSheet() : false;
}
CSSStyleSheet::~CSSStyleSheet()
{
}
CSSRule *CSSStyleSheet::ownerRule() const
{
return (parent() && parent()->isRule()) ? static_cast<CSSRule*>(parent()) : 0;
}
unsigned CSSStyleSheet::insertRule(const String& rule, unsigned index, ExceptionCode& ec)
{
ec = 0;
if (index > length()) {
ec = INDEX_SIZE_ERR;
return 0;
}
CSSParser p(useStrictParsing());
RefPtr<CSSRule> r = p.parseRule(this, rule);
if (!r) {
ec = SYNTAX_ERR;
return 0;
}
// Throw a HIERARCHY_REQUEST_ERR exception if the rule cannot be inserted at the specified index. The best
// example of this is an @import rule inserted after regular rules.
if (index > 0) {
if (r->isImportRule()) {
// Check all the rules that come before this one to make sure they are only @charset and @import rules.
for (unsigned i = 0; i < index; ++i) {
if (!item(i)->isCharsetRule() && !item(i)->isImportRule()) {
ec = HIERARCHY_REQUEST_ERR;
return 0;
}
}
} else if (r->isCharsetRule()) {
// The @charset rule has to come first and there can be only one.
ec = HIERARCHY_REQUEST_ERR;
return 0;
}
}
insert(index, r.release());
styleSheetChanged();
return index;
}
int CSSStyleSheet::addRule(const String& selector, const String& style, int index, ExceptionCode& ec)
{
insertRule(selector + " { " + style + " }", index, ec);
// As per Microsoft documentation, always return -1.
return -1;
}
int CSSStyleSheet::addRule(const String& selector, const String& style, ExceptionCode& ec)
{
return addRule(selector, style, length(), ec);
}
PassRefPtr<CSSRuleList> CSSStyleSheet::cssRules(bool omitCharsetRules)
{
KURL url = finalURL();
if (!url.isEmpty() && document() && !document()->securityOrigin()->canRequest(url))
return 0;
return CSSRuleList::create(this, omitCharsetRules);
}
void CSSStyleSheet::deleteRule(unsigned index, ExceptionCode& ec)
{
if (index >= length()) {
ec = INDEX_SIZE_ERR;
return;
}
ec = 0;
item(index)->setParent(0);
remove(index);
styleSheetChanged();
}
void CSSStyleSheet::addNamespace(CSSParser* p, const AtomicString& prefix, const AtomicString& uri)
{
if (uri.isNull())
return;
m_namespaces = adoptPtr(new CSSNamespace(prefix, uri, m_namespaces.release()));
if (prefix.isEmpty())
// Set the default namespace on the parser so that selectors that omit namespace info will
// be able to pick it up easily.
p->m_defaultNamespace = uri;
}
const AtomicString& CSSStyleSheet::determineNamespace(const AtomicString& prefix)
{
if (prefix.isNull())
return nullAtom; // No namespace. If an element/attribute has a namespace, we won't match it.
if (prefix == starAtom)
return starAtom; // We'll match any namespace.
if (m_namespaces) {
if (CSSNamespace* namespaceForPrefix = m_namespaces->namespaceForPrefix(prefix))
return namespaceForPrefix->uri;
}
return nullAtom; // Assume we won't match any namespaces.
}
bool CSSStyleSheet::parseString(const String &string, bool strict)
{
return parseStringAtLine(string, strict, 0);
}
bool CSSStyleSheet::parseStringAtLine(const String& string, bool strict, int startLineNumber)
{
setStrictParsing(strict);
CSSParser p(strict);
p.parseSheet(this, string, startLineNumber);
return true;
}
bool CSSStyleSheet::isLoading()
{
unsigned len = length();
for (unsigned i = 0; i < len; ++i) {
StyleBase* rule = item(i);
if (rule->isImportRule() && static_cast<CSSImportRule*>(rule)->isLoading())
return true;
}
return false;
}
void CSSStyleSheet::checkLoaded()
{
if (isLoading())
return;
if (parent())
parent()->checkLoaded();
// Avoid |this| being deleted by scripts that run via
// ScriptableDocumentParser::executeScriptsWaitingForStylesheets().
// See <rdar://problem/6622300>.
RefPtr<CSSStyleSheet> protector(this);
m_loadCompleted = ownerNode() ? ownerNode()->sheetLoaded() : true;
}
Document* CSSStyleSheet::document()
{
StyleBase* styleObject = this;
while (styleObject) {
if (styleObject->isCSSStyleSheet()) {
Node* ownerNode = static_cast<CSSStyleSheet*>(styleObject)->ownerNode();
if (ownerNode)
return ownerNode->document();
}
if (styleObject->isRule())
styleObject = static_cast<CSSRule*>(styleObject)->parentStyleSheet();
else
styleObject = styleObject->parent();
}
return 0;
}
void CSSStyleSheet::styleSheetChanged()
{
StyleBase* root = this;
while (StyleBase* parent = root->parent())
root = parent;
Document* documentToUpdate = root->isCSSStyleSheet() ? static_cast<CSSStyleSheet*>(root)->document() : 0;
/* FIXME: We don't need to do everything updateStyleSelector does,
* basically we just need to recreate the document's selector with the
* already existing style sheets.
*/
if (documentToUpdate)
documentToUpdate->styleSelectorChanged(DeferRecalcStyle);
}
KURL CSSStyleSheet::completeURL(const String& url) const
{
// Always return a null URL when passed a null string.
// FIXME: Should we change the KURL constructor to have this behavior?
// See also Document::completeURL(const String&)
if (url.isNull() || m_charset.isEmpty())
return StyleSheet::completeURL(url);
const TextEncoding encoding = TextEncoding(m_charset);
return KURL(baseURL(), url, encoding);
}
void CSSStyleSheet::addSubresourceStyleURLs(ListHashSet<KURL>& urls)
{
Deque<CSSStyleSheet*> styleSheetQueue;
styleSheetQueue.append(this);
while (!styleSheetQueue.isEmpty()) {
CSSStyleSheet* styleSheet = styleSheetQueue.takeFirst();
for (unsigned i = 0; i < styleSheet->length(); ++i) {
StyleBase* styleBase = styleSheet->item(i);
if (!styleBase->isRule())
continue;
CSSRule* rule = static_cast<CSSRule*>(styleBase);
if (rule->isImportRule()) {
if (CSSStyleSheet* ruleStyleSheet = static_cast<CSSImportRule*>(rule)->styleSheet())
styleSheetQueue.append(ruleStyleSheet);
}
rule->addSubresourceStyleURLs(urls);
}
}
}
}