Add a primitive text machter as an AdBlockRule implementations

About 30% of the filter of easylist are just simple text matching. This
new AdBlockRule implementation detects the simple occurences of this
to match the url directly.

On Qt 4.7, this reduce the time spend in AdBlock by around 20%.

1 files changed, 68 insertions, 0 deletions

diff --git a/src/adblock/adblockruletextmatchimpl.cpp b/src/adblock/adblockruletextmatchimpl.cpp
new file mode 100644
index 00000000..7c02ea37
--- /dev/null
+++ b/src/adblock/adblockruletextmatchimpl.cpp
@@ -0,0 +1,68 @@
+/* ============================================================
+*
+* 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/>.
+*
+* ============================================================ */
+
+// Self Includes
+#include "adblockruletextmatchimpl.h"
+
+// Rekonq Includes
+#include "rekonq_defines.h"
+
+AdBlockRuleTextMatchImpl::AdBlockRuleTextMatchImpl(const QString &filter)
+    : AdBlockRuleImpl(filter)
+{
+    Q_ASSERT(AdBlockRuleTextMatchImpl::isTextMatchFilter(filter));
+
+    m_textToMatch = filter;
+    m_textToMatch.remove(QL1C('*'));
+}
+
+bool AdBlockRuleTextMatchImpl::match(const QString &encodedUrl) const
+{
+    return encodedUrl.contains(m_textToMatch, Qt::CaseInsensitive);
+}
+
+bool AdBlockRuleTextMatchImpl::isTextMatchFilter(const QString &filter)
+{
+    // We don't deal with options just yet
+    if (filter.contains(QL1C('$')))
+        return false;
+
+    // We don't deal with element matching
+    if (filter.contains(QL1S("##")))
+        return false;
+
+    // We don't deal with the begin-end matching
+    if (filter.startsWith(QL1C('|')) || filter.endsWith(QL1C('|')))
+        return false;
+
+    // We only handle * at the beginning or the end
+    int starPosition = filter.indexOf(QL1C('*'));
+    while (starPosition >= 0) {
+        if (starPosition != 0 && starPosition != (filter.length() - 1))
+            return false;
+        starPosition = filter.indexOf(QL1C('*'), starPosition + 1);
+    }
+    return true;
+}