add spam engine

1 files changed, 127 insertions, 0 deletions

diff --git a/library/spam/b8/degenerator/degenerator_default.php b/library/spam/b8/degenerator/degenerator_default.php
new file mode 100644
index 000000000..4ff6d882b
--- /dev/null
+++ b/library/spam/b8/degenerator/degenerator_default.php
@@ -0,0 +1,127 @@
+<?php
+
+#   Copyright (C) 2006-2010 Tobias Leupold <tobias.leupold@web.de>
+#
+#   This file is part of the b8 package
+#
+#   This program is free software; you can redistribute it and/or modify it
+#   under the terms of the GNU Lesser General Public License as published by
+#   the Free Software Foundation in version 2.1 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 Lesser General Public
+#   License for more details.
+#
+#   You should have received a copy of the GNU Lesser General Public License
+#   along with this program; if not, write to the Free Software Foundation,
+#   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+
+/**
+ * Copyright (C) 2006-2010 Tobias Leupold <tobias.leupold@web.de>
+ *
+ * @license LGPL
+ * @access public
+ * @package b8
+ * @author Tobias Leupold
+ */
+
+class b8_degenerator_default
+{
+
+	public $degenerates = array();
+
+	/**
+	 * Generates a list of "degenerated" words for a list of words.
+	 *
+	 * @access public
+	 * @param array $tokens
+	 * @return array An array containing an array of degenerated tokens for each token
+	 */
+
+	public function degenerate(array $words)
+	{
+
+		$degenerates = array();
+
+		foreach($words as $word)
+			$degenerates[$word] = $this->_degenerate_word($word);
+
+		return $degenerates;
+
+	}
+
+	/**
+	 * If the original word is not found in the database then
+	 * we build "degenerated" versions of the word to lookup.
+	 *
+	 * @access private
+	 * @param string $word
+	 * @return array An array of degenerated words
+	 */
+
+	protected function _degenerate_word($word)
+	{
+
+		# Check for any stored words so the process doesn't have to repeat
+		if(isset($this->degenerates[$word]) === TRUE)
+			return $this->degenerates[$word];
+
+		$degenerate = array();
+
+		# Add different version of upper and lower case and ucfirst
+		array_push($degenerate, strtolower($word));
+		array_push($degenerate, strtoupper($word));
+		array_push($degenerate, ucfirst($word));
+
+		# Degenerate all versions
+
+		foreach($degenerate as $alt_word) {
+
+			# Look for stuff like !!! and ???
+
+			if(preg_match('/[!?]$/', $alt_word) > 0) {
+
+				# Add versions with different !s and ?s
+
+				if(preg_match('/[!?]{2,}$/', $alt_word) > 0) {
+					$tmp = preg_replace('/([!?])+$/', '$1', $alt_word);
+					array_push($degenerate, $tmp);
+				}
+
+				$tmp = preg_replace('/([!?])+$/', '', $alt_word);
+				array_push($degenerate, $tmp);
+
+			}
+
+			# Look for ... at the end of the word
+
+			$alt_word_int = $alt_word;
+
+			while(preg_match('/[\.]$/', $alt_word_int) > 0) {
+				$alt_word_int = substr($alt_word_int, 0, strlen($alt_word_int) - 1);
+				array_push($degenerate, $alt_word_int);
+			}
+
+		}
+
+		# Some degenerates are the same as the original word. These don't have
+		# to be fetched, so we create a new array with only new tokens
+
+		$real_degenerate = array();
+
+		foreach($degenerate as $deg_word) {
+			if($word != $deg_word)
+				array_push($real_degenerate, $deg_word);
+		}
+
+		# Store the list of degenerates for the token
+		$this->degenerates[$word] = $real_degenerate;
+
+		return $real_degenerate;
+
+	}
+
+}
+
+?>
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