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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 "core/dom/Document.h"
     27 #include "weborigin/KURL.h"
     28 
     29 namespace WebCore {
     30 
     31 bool SVGURIReference::parseAttribute(const QualifiedName& name, const AtomicString& value)
     32 {
     33     if (name.matches(XLinkNames::hrefAttr)) {
     34         setHrefBaseValue(value);
     35         return true;
     36     }
     37 
     38     return false;
     39 }
     40 
     41 bool SVGURIReference::isKnownAttribute(const QualifiedName& attrName)
     42 {
     43     return attrName.matches(XLinkNames::hrefAttr);
     44 }
     45 
     46 String SVGURIReference::fragmentIdentifierFromIRIString(const String& url, Document* document)
     47 {
     48     ASSERT(document);
     49     size_t start = url.find('#');
     50     if (start == notFound)
     51         return emptyString();
     52 
     53     KURL base = start ? KURL(document->baseURI(), url.substring(0, start)) : document->baseURI();
     54     if (equalIgnoringFragmentIdentifier(base, document->url()))
     55         return url.substring(start + 1);
     56 
     57     return emptyString();
     58 }
     59 
     60 static inline KURL urlFromIRIStringWithFragmentIdentifier(const String& url, Document* document, String& fragmentIdentifier)
     61 {
     62     ASSERT(document);
     63     size_t startOfFragmentIdentifier = url.find('#');
     64     if (startOfFragmentIdentifier == notFound)
     65         return KURL();
     66 
     67     // Exclude the '#' character when determining the fragmentIdentifier.
     68     fragmentIdentifier = url.substring(startOfFragmentIdentifier + 1);
     69     if (startOfFragmentIdentifier) {
     70         KURL base(document->baseURI(), url.substring(0, startOfFragmentIdentifier));
     71         return KURL(base, url.substring(startOfFragmentIdentifier));
     72     }
     73 
     74     return KURL(document->baseURI(), url.substring(startOfFragmentIdentifier));
     75 }
     76 
     77 Element* SVGURIReference::targetElementFromIRIString(const String& iri, Document* document, String* fragmentIdentifier, Document* externalDocument)
     78 {
     79     // If there's no fragment identifier contained within the IRI string, we can't lookup an element.
     80     String id;
     81     KURL url = urlFromIRIStringWithFragmentIdentifier(iri, document, id);
     82     if (url == KURL())
     83         return 0;
     84 
     85     if (fragmentIdentifier)
     86         *fragmentIdentifier = id;
     87 
     88     if (id.isEmpty())
     89         return 0;
     90 
     91     if (externalDocument) {
     92         // Enforce that the referenced url matches the url of the document that we've loaded for it!
     93         ASSERT(equalIgnoringFragmentIdentifier(url, externalDocument->url()));
     94         return externalDocument->getElementById(id);
     95     }
     96 
     97     // Exit early if the referenced url is external, and we have no externalDocument given.
     98     if (isExternalURIReference(iri, document))
     99         return 0;
    100 
    101     return document->getElementById(id);
    102 }
    103 
    104 void SVGURIReference::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
    105 {
    106     supportedAttributes.add(XLinkNames::hrefAttr);
    107 }
    108 
    109 }
    110