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#define __SP_URI_REFERENCES_C__
/*
* Helper methods for resolving URI References
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
*
* Copyright (C) 2001-2002 Lauris Kaplinski
* Copyright (C) 2001 Ximian, Inc.
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <cstring>
#include <string>
#include "document.h"
#include "sp-object.h"
#include "uri.h"
#include "uri-references.h"
#include "extract-uri.h"
#include <sigc++/functors/mem_fun.h>
namespace Inkscape {
URIReference::URIReference(SPObject *owner)
: _owner(owner), _owner_document(NULL), _obj(NULL), _uri(NULL)
{
g_assert(_owner != NULL);
/* FIXME !!! attach to owner's destroy signal to clean up in case */
}
URIReference::URIReference(SPDocument *owner_document)
: _owner(NULL), _owner_document(owner_document), _obj(NULL), _uri(NULL)
{
g_assert(_owner_document != NULL);
}
URIReference::~URIReference()
{
detach();
}
void URIReference::attach(const URI &uri) throw(BadURIException)
{
SPDocument *document;
if (_owner) {
document = SP_OBJECT_DOCUMENT(_owner);
} else if (_owner_document) {
document = _owner_document;
} else {
g_assert_not_reached();
}
gchar const *fragment = uri.getFragment();
if ( !uri.isRelative() || uri.getQuery() || !fragment ) {
throw UnsupportedURIException();
}
/* FIXME !!! real xpointer support should be delegated to document */
/* for now this handles the minimal xpointer form that SVG 1.0
* requires of us
*/
gchar *id;
if (!strncmp(fragment, "xpointer(", 9)) {
/* FIXME !!! this is wasteful */
/* FIXME: It looks as though this is including "))" in the id. I suggest moving
the strlen calculation and validity testing to before strdup, and copying just
the id without the "))". -- pjrm */
if (!strncmp(fragment, "xpointer(id(", 12)) {
id = g_strdup(fragment+12);
size_t const len = strlen(id);
if ( len < 3 || strcmp(id+len-2, "))") ) {
g_free(id);
throw MalformedURIException();
}
} else {
throw UnsupportedURIException();
}
} else {
id = g_strdup(fragment);
}
/* FIXME !!! validate id as an NCName somewhere */
if (_uri) {
delete _uri;
}
_uri = new URI(uri);
_connection.disconnect();
_setObject(document->getObjectById(id));
_connection = document->connectIdChanged(id, sigc::mem_fun(*this, &URIReference::_setObject));
g_free(id);
}
void URIReference::detach()
{
_connection.disconnect();
delete _uri;
_uri = NULL;
_setObject(NULL);
}
void URIReference::_setObject(SPObject *obj)
{
if ( obj && !_acceptObject(obj) ) {
obj = NULL;
}
if ( obj == _obj ) return;
SPObject *old_obj=_obj;
_obj = obj;
_release_connection.disconnect();
if (_obj) {
sp_object_href(_obj, _owner);
_release_connection = _obj->connectRelease(sigc::mem_fun(*this, &URIReference::_release));
}
_changed_signal.emit(old_obj, _obj);
if (old_obj) {
/* release the old object _after_ the signal emission */
sp_object_hunref(old_obj, _owner);
}
}
/* If an object is deleted, current semantics require that we release
* it on its "release" signal, rather than later, when its ID is actually
* unregistered from the document.
*/
void URIReference::_release(SPObject *obj)
{
g_assert( _obj == obj );
_setObject(NULL);
}
} /* namespace Inkscape */
SPObject* sp_css_uri_reference_resolve( SPDocument *document, const gchar *uri )
{
SPObject* ref = 0;
if ( document && uri && ( strncmp(uri, "url(", 4) == 0 ) ) {
gchar *trimmed = extract_uri( uri );
if ( trimmed ) {
ref = sp_uri_reference_resolve( document, trimmed );
g_free( trimmed );
}
}
return ref;
}
SPObject *
sp_uri_reference_resolve (SPDocument *document, const gchar *uri)
{
SPObject* ref = 0;
if ( uri && (*uri == '#') ) {
ref = document->getObjectById( uri + 1 );
}
return ref;
}
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