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/*
This file is part of Akregator.
Copyright (C) 2004 Teemu Rytilahti <tpr@d5k.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
As a special exception, permission is given to link this program
with any edition of Qt, and distribute the resulting executable,
without including the source code for Qt in the source distribution.
*/
#include <qregexp.h>
#include <qstring.h>
#include <qstringlist.h>
#include <qvaluelist.h>
#include <kcharsets.h>
#include "feeddetector.h"
using namespace Akregator;
FeedDetectorEntryList FeedDetector::extractFromLinkTags(const QString& s)
{
//reduce all sequences of spaces, newlines etc. to one space:
QString str = s.simplifyWhiteSpace();
// extracts <link> tags
QRegExp reLinkTag("<[\\s]?LINK[^>]*REL[\\s]?=[\\s]?\\\"[\\s]?(ALTERNATE|SERVICE\\.FEED)[\\s]?\\\"[^>]*>", false);
// extracts the URL (href="url")
QRegExp reHref("HREF[\\s]?=[\\s]?\\\"([^\\\"]*)\\\"", false);
// extracts type attribute
QRegExp reType("TYPE[\\s]?=[\\s]?\\\"([^\\\"]*)\\\"", false);
// extracts the title (title="title")
QRegExp reTitle("TITLE[\\s]?=[\\s]?\\\"([^\\\"]*)\\\"", false);
int pos = 0;
int matchpos = 0;
// get all <link> tags
QStringList linkTags;
//int strlength = str.length();
while ( matchpos != -1 )
{
matchpos = reLinkTag.search(str, pos);
if (matchpos != -1)
{
linkTags.append( str.mid(matchpos, reLinkTag.matchedLength()) );
pos = matchpos + reLinkTag.matchedLength();
}
}
FeedDetectorEntryList list;
for ( QStringList::Iterator it = linkTags.begin(); it != linkTags.end(); ++it )
{
QString type;
int pos = reType.search(*it, 0);
if (pos != -1)
type = reType.cap(1).lower();
// we accept only type attributes indicating a feed
if ( type != "application/rss+xml" && type != "application/rdf+xml"
&& type != "application/atom+xml" && type != "text/xml" )
continue;
QString title;
pos = reTitle.search(*it, 0);
if (pos != -1)
title = reTitle.cap(1);
title = KCharsets::resolveEntities(title);
QString url;
pos = reHref.search(*it, 0);
if (pos != -1)
url = reHref.cap(1);
url = KCharsets::resolveEntities(url);
// if feed has no title, use the url as preliminary title (until feed is parsed)
if ( title.isEmpty() )
title = url;
if ( !url.isEmpty() )
list.append(FeedDetectorEntry(url, title) );
}
return list;
}
QStringList FeedDetector::extractBruteForce(const QString& s)
{
QString str = s.simplifyWhiteSpace();
QRegExp reAhrefTag("<[\\s]?A[^>]?HREF=[\\s]?\\\"[^\\\"]*\\\"[^>]*>", false);
// extracts the URL (href="url")
QRegExp reHref("HREF[\\s]?=[\\s]?\\\"([^\\\"]*)\\\"", false);
QRegExp rssrdfxml(".*(RSS|RDF|XML)", false);
int pos = 0;
int matchpos = 0;
// get all <a href> tags and capture url
QStringList list;
//int strlength = str.length();
while ( matchpos != -1 )
{
matchpos = reAhrefTag.search(str, pos);
if ( matchpos != -1 )
{
QString ahref = str.mid(matchpos, reAhrefTag.matchedLength());
int hrefpos = reHref.search(ahref, 0);
if ( hrefpos != -1 )
{
QString url = reHref.cap(1);
url = KCharsets::resolveEntities(url);
if ( rssrdfxml.exactMatch(url) )
list.append(url);
}
pos = matchpos + reAhrefTag.matchedLength();
}
}
return list;
}
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