Add a special matcher for ad block filters for host name

Quite a few rules of ad block are just matching domains. Those
are of the form:
||trolltech.com^$options

This patch add a new class to deal with this kind of filter,
AdBlockHostMatcher. Matching a host address is much faster (O(1))
than going through the entire list of rules.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/adblock/adblockhostmatcher.h b/src/adblock/adblockhostmatcher.h
new file mode 100644
index 00000000..0a15bd4e
--- /dev/null
+++ b/src/adblock/adblockhostmatcher.h
@@ -0,0 +1,51 @@
+/* ============================================================
+*
+* This file is a part of the rekonq project
+*
+* Copyright (C) 2010 by Benjamin Poulain <ikipou at gmail dot com>
+*
+*
+* 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) version 3 or any later version
+* accepted by the membership of KDE e.V. (or its successor approved
+* by the membership of KDE e.V.), which shall act as a proxy
+* defined in Section 14 of version 3 of the license.
+*
+* 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, see <http://www.gnu.org/licenses/>.
+*
+* ============================================================ */
+
+#ifndef ADBLOCKHOSTMATCHER_H
+#define ADBLOCKHOSTMATCHER_H
+
+#include <QSet>
+#include <QString>
+
+class AdBlockHostMatcher
+{
+public:
+    // Try to add an adblock filter to this host matcher.
+    // If the filter is not an hostname, the filter is not added
+    // and the method return false;
+    bool tryAddFilter(const QString &filter);
+
+    bool match(const QString &host) const
+    {
+        return m_hostList.contains(host.toLower());
+    }
+
+    void clear() { m_hostList.clear(); }
+
+private:
+    QSet<QString> m_hostList;
+};
+
+#endif // ADBLOCKHOSTMATCHER_H