1 /*

     2  * (C) 1999-2003 Lars Knoll (knoll@kde.org)

     3  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.

     4  *

     5  * This library is free software; you can redistribute it and/or

     6  * modify it under the terms of the GNU Library General Public

     7  * License as published by the Free Software Foundation; either

     8  * version 2 of the License, or (at your option) any later version.

     9  *

    10  * This library is distributed in the hope that it will be useful,

    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13  * Library General Public License for more details.

    14  *

    15  * You should have received a copy of the GNU Library General Public License

    16  * along with this library; see the file COPYING.LIB.  If not, write to

    17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    18  * Boston, MA 02110-1301, USA.

    19  */

    20 

    21 #include "config.h"

    22 #include "CSSStyleSheet.h"

    23 

    24 #include "CSSImportRule.h"

    25 #include "CSSNamespace.h"

    26 #include "CSSParser.h"

    27 #include "CSSRuleList.h"

    28 #include "Document.h"

    29 #include "ExceptionCode.h"

    30 #include "Node.h"

    31 #include "SecurityOrigin.h"

    32 #include "TextEncoding.h"

    33 #include <wtf/Deque.h>

    34 

    35 namespace WebCore {

    36 

    37 CSSStyleSheet::CSSStyleSheet(CSSStyleSheet* parentSheet, const String& href, const KURL& baseURL, const String& charset)

    38     : StyleSheet(parentSheet, href, baseURL)

    39     , m_doc(parentSheet ? parentSheet->doc() : 0)

    40     , m_namespaces(0)

    41     , m_charset(charset)

    42     , m_loadCompleted(false)

    43     , m_strictParsing(!parentSheet || parentSheet->useStrictParsing())

    44     , m_isUserStyleSheet(parentSheet ? parentSheet->isUserStyleSheet() : false)

    45     , m_hasSyntacticallyValidCSSHeader(true)

    46 {

    47 }

    48 

    49 CSSStyleSheet::CSSStyleSheet(Node* parentNode, const String& href, const KURL& baseURL, const String& charset)

    50     : StyleSheet(parentNode, href, baseURL)

    51     , m_doc(parentNode->document())

    52     , m_namespaces(0)

    53     , m_charset(charset)

    54     , m_loadCompleted(false)

    55     , m_strictParsing(false)

    56     , m_isUserStyleSheet(false)

    57     , m_hasSyntacticallyValidCSSHeader(true)

    58 {

    59 }

    60 

    61 CSSStyleSheet::CSSStyleSheet(CSSRule* ownerRule, const String& href, const KURL& baseURL, const String& charset)

    62     : StyleSheet(ownerRule, href, baseURL)

    63     , m_namespaces(0)

    64     , m_charset(charset)

    65     , m_loadCompleted(false)

    66     , m_strictParsing(!ownerRule || ownerRule->useStrictParsing())

    67     , m_hasSyntacticallyValidCSSHeader(true)

    68 {

    69     CSSStyleSheet* parentSheet = ownerRule ? ownerRule->parentStyleSheet() : 0;

    70     m_doc = parentSheet ? parentSheet->doc() : 0;

    71     m_isUserStyleSheet = parentSheet ? parentSheet->isUserStyleSheet() : false;

    72 }

    73 

    74 CSSStyleSheet::~CSSStyleSheet()

    75 {

    76     delete m_namespaces;

    77 }

    78 

    79 CSSRule *CSSStyleSheet::ownerRule() const

    80 {

    81     return (parent() && parent()->isRule()) ? static_cast<CSSRule*>(parent()) : 0;

    82 }

    83 

    84 unsigned CSSStyleSheet::insertRule(const String& rule, unsigned index, ExceptionCode& ec)

    85 {

    86     ec = 0;

    87     if (index > length()) {

    88         ec = INDEX_SIZE_ERR;

    89         return 0;

    90     }

    91     CSSParser p(useStrictParsing());

    92     RefPtr<CSSRule> r = p.parseRule(this, rule);

    93 

    94     if (!r) {

    95         ec = SYNTAX_ERR;

    96         return 0;

    97     }

    98 

    99     // Throw a HIERARCHY_REQUEST_ERR exception if the rule cannot be inserted at the specified index.  The best

   100     // example of this is an @import rule inserted after regular rules.

   101     if (index > 0) {

   102         if (r->isImportRule()) {

   103             // Check all the rules that come before this one to make sure they are only @charset and @import rules.

   104             for (unsigned i = 0; i < index; ++i) {

   105                 if (!item(i)->isCharsetRule() && !item(i)->isImportRule()) {

   106                     ec = HIERARCHY_REQUEST_ERR;

   107                     return 0;

   108                 }

   109             }

   110         } else if (r->isCharsetRule()) {

   111             // The @charset rule has to come first and there can be only one.

   112             ec = HIERARCHY_REQUEST_ERR;

   113             return 0;

   114         }

   115     }

   116 

   117     insert(index, r.release());

   118     

   119     styleSheetChanged();

   120     

   121     return index;

   122 }

   123 

   124 int CSSStyleSheet::addRule(const String& selector, const String& style, int index, ExceptionCode& ec)

   125 {

   126     insertRule(selector + " { " + style + " }", index, ec);

   127 

   128     // As per Microsoft documentation, always return -1.

   129     return -1;

   130 }

   131 

   132 int CSSStyleSheet::addRule(const String& selector, const String& style, ExceptionCode& ec)

   133 {

   134     return addRule(selector, style, length(), ec);

   135 }

   136 

   137 PassRefPtr<CSSRuleList> CSSStyleSheet::cssRules(bool omitCharsetRules)

   138 {

   139     KURL url = finalURL();

   140     if (!url.isEmpty() && doc() && !doc()->securityOrigin()->canRequest(url))

   141         return 0;

   142     return CSSRuleList::create(this, omitCharsetRules);

   143 }

   144 

   145 void CSSStyleSheet::deleteRule(unsigned index, ExceptionCode& ec)

   146 {

   147     if (index >= length()) {

   148         ec = INDEX_SIZE_ERR;

   149         return;

   150     }

   151 

   152     ec = 0;

   153     remove(index);

   154     styleSheetChanged();

   155 }

   156 

   157 void CSSStyleSheet::addNamespace(CSSParser* p, const AtomicString& prefix, const AtomicString& uri)

   158 {

   159     if (uri.isNull())

   160         return;

   161 

   162     m_namespaces = new CSSNamespace(prefix, uri, m_namespaces);

   163     

   164     if (prefix.isEmpty())

   165         // Set the default namespace on the parser so that selectors that omit namespace info will

   166         // be able to pick it up easily.

   167         p->m_defaultNamespace = uri;

   168 }

   169 

   170 const AtomicString& CSSStyleSheet::determineNamespace(const AtomicString& prefix)

   171 {

   172     if (prefix.isNull())

   173         return nullAtom; // No namespace. If an element/attribute has a namespace, we won't match it.

   174     if (prefix == starAtom)

   175         return starAtom; // We'll match any namespace.

   176     if (m_namespaces) {

   177         CSSNamespace* ns = m_namespaces->namespaceForPrefix(prefix);

   178         if (ns)

   179             return ns->uri();

   180     }

   181     return nullAtom; // Assume we wont match any namespaces.

   182 }

   183 

   184 bool CSSStyleSheet::parseString(const String &string, bool strict)

   185 {

   186     return parseStringAtLine(string, strict, 0);

   187 }

   188 

   189 bool CSSStyleSheet::parseStringAtLine(const String& string, bool strict, int startLineNumber)

   190 {

   191     setStrictParsing(strict);

   192     CSSParser p(strict);

   193     p.parseSheet(this, string, startLineNumber);

   194     return true;

   195 }

   196 

   197 bool CSSStyleSheet::isLoading()

   198 {

   199     unsigned len = length();

   200     for (unsigned i = 0; i < len; ++i) {

   201         StyleBase* rule = item(i);

   202         if (rule->isImportRule() && static_cast<CSSImportRule*>(rule)->isLoading())

   203             return true;

   204     }

   205     return false;

   206 }

   207 

   208 void CSSStyleSheet::checkLoaded()

   209 {

   210     if (isLoading())

   211         return;

   212     if (parent())

   213         parent()->checkLoaded();

   214 

   215     // Avoid |this| being deleted by scripts that run via

   216     // ScriptableDocumentParser::executeScriptsWaitingForStylesheets().

   217     // See <rdar://problem/6622300>.

   218     RefPtr<CSSStyleSheet> protector(this);

   219     m_loadCompleted = ownerNode() ? ownerNode()->sheetLoaded() : true;

   220 }

   221 

   222 void CSSStyleSheet::styleSheetChanged()

   223 {

   224     StyleBase* root = this;

   225     while (StyleBase* parent = root->parent())

   226         root = parent;

   227     Document* documentToUpdate = root->isCSSStyleSheet() ? static_cast<CSSStyleSheet*>(root)->doc() : 0;

   228     

   229     /* FIXME: We don't need to do everything updateStyleSelector does,

   230      * basically we just need to recreate the document's selector with the

   231      * already existing style sheets.

   232      */

   233     if (documentToUpdate)

   234         documentToUpdate->updateStyleSelector();

   235 }

   236 

   237 KURL CSSStyleSheet::completeURL(const String& url) const

   238 {

   239     // Always return a null URL when passed a null string.

   240     // FIXME: Should we change the KURL constructor to have this behavior?

   241     // See also Document::completeURL(const String&)

   242     if (url.isNull() || m_charset.isEmpty())

   243         return StyleSheet::completeURL(url);

   244     const TextEncoding encoding = TextEncoding(m_charset);

   245     return KURL(baseURL(), url, encoding);

   246 }

   247 

   248 void CSSStyleSheet::addSubresourceStyleURLs(ListHashSet<KURL>& urls)

   249 {

   250     Deque<CSSStyleSheet*> styleSheetQueue;

   251     styleSheetQueue.append(this);

   252 

   253     while (!styleSheetQueue.isEmpty()) {

   254         CSSStyleSheet* styleSheet = styleSheetQueue.takeFirst();

   255 

   256         for (unsigned i = 0; i < styleSheet->length(); ++i) {

   257             StyleBase* styleBase = styleSheet->item(i);

   258             if (!styleBase->isRule())

   259                 continue;

   260             

   261             CSSRule* rule = static_cast<CSSRule*>(styleBase);

   262             if (rule->isImportRule()) {

   263                 if (CSSStyleSheet* ruleStyleSheet = static_cast<CSSImportRule*>(rule)->styleSheet())

   264                     styleSheetQueue.append(ruleStyleSheet);

   265             }

   266             rule->addSubresourceStyleURLs(urls);

   267         }

   268     }

   269 }

   270 

   271 }