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      1 /*
      2  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis (at) kde.org>
      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 
     23 #include "core/svg/SVGURIReference.h"
     24 
     25 #include "XLinkNames.h"
     26 #include "platform/weborigin/KURL.h"
     27 
     28 namespace WebCore {
     29 
     30 bool SVGURIReference::parseAttribute(const QualifiedName& name, const AtomicString& value)
     31 {
     32     if (name.matches(XLinkNames::hrefAttr)) {
     33         setHrefBaseValue(value);
     34         return true;
     35     }
     36 
     37     return false;
     38 }
     39 
     40 bool SVGURIReference::isKnownAttribute(const QualifiedName& attrName)
     41 {
     42     return attrName.matches(XLinkNames::hrefAttr);
     43 }
     44 
     45 String SVGURIReference::fragmentIdentifierFromIRIString(const String& url, const Document& document)
     46 {
     47     size_t start = url.find('#');
     48     if (start == kNotFound)
     49         return emptyString();
     50 
     51     KURL base = start ? KURL(document.baseURI(), url.substring(0, start)) : document.baseURI();
     52     if (equalIgnoringFragmentIdentifier(base, document.url()))
     53         return url.substring(start + 1);
     54 
     55     return emptyString();
     56 }
     57 
     58 static inline KURL urlFromIRIStringWithFragmentIdentifier(const String& url, const Document& document, String& fragmentIdentifier)
     59 {
     60     size_t startOfFragmentIdentifier = url.find('#');
     61     if (startOfFragmentIdentifier == kNotFound)
     62         return KURL();
     63 
     64     // Exclude the '#' character when determining the fragmentIdentifier.
     65     fragmentIdentifier = url.substring(startOfFragmentIdentifier + 1);
     66     if (startOfFragmentIdentifier) {
     67         KURL base(document.baseURI(), url.substring(0, startOfFragmentIdentifier));
     68         return KURL(base, url.substring(startOfFragmentIdentifier));
     69     }
     70 
     71     return KURL(document.baseURI(), url.substring(startOfFragmentIdentifier));
     72 }
     73 
     74 Element* SVGURIReference::targetElementFromIRIString(const String& iri, const Document& document, String* fragmentIdentifier, Document* externalDocument)
     75 {
     76     // If there's no fragment identifier contained within the IRI string, we can't lookup an element.
     77     String id;
     78     KURL url = urlFromIRIStringWithFragmentIdentifier(iri, document, id);
     79     if (url == KURL())
     80         return 0;
     81 
     82     if (fragmentIdentifier)
     83         *fragmentIdentifier = id;
     84 
     85     if (id.isEmpty())
     86         return 0;
     87 
     88     if (externalDocument) {
     89         // Enforce that the referenced url matches the url of the document that we've loaded for it!
     90         ASSERT(equalIgnoringFragmentIdentifier(url, externalDocument->url()));
     91         return externalDocument->getElementById(id);
     92     }
     93 
     94     // Exit early if the referenced url is external, and we have no externalDocument given.
     95     if (isExternalURIReference(iri, document))
     96         return 0;
     97 
     98     return document.getElementById(id);
     99 }
    100 
    101 void SVGURIReference::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
    102 {
    103     supportedAttributes.add(XLinkNames::hrefAttr);
    104 }
    105 
    106 }
    107