1 files changed, 70 insertions, 0 deletions
diff --git a/platform/www/inc/Subscriptions/SubscriberRegexBuilder.php b/platform/www/inc/Subscriptions/SubscriberRegexBuilder.php
new file mode 100644
index 0000000..959702a
--- /dev/null
+++ b/platform/www/inc/Subscriptions/SubscriberRegexBuilder.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace dokuwiki\Subscriptions;
+
+use Exception;
+
+class SubscriberRegexBuilder
+{
+
+    /**
+     * Construct a regular expression for parsing a subscription definition line
+     *
+     * @param string|array $user
+     * @param string|array $style
+     * @param string|array $data
+     *
+     * @return string complete regexp including delimiters
+     * @throws Exception when no data is passed
+     * @author Andreas Gohr <andi@splitbrain.org>
+     *
+     */
+    public function buildRegex($user = null, $style = null, $data = null)
+    {
+        // always work with arrays
+        $user = (array)$user;
+        $style = (array)$style;
+        $data = (array)$data;
+
+        // clean
+        $user = array_filter(array_map('trim', $user));
+        $style = array_filter(array_map('trim', $style));
+        $data = array_filter(array_map('trim', $data));
+
+        // user names are encoded
+        $user = array_map('auth_nameencode', $user);
+
+        // quote
+        $user = array_map('preg_quote_cb', $user);
+        $style = array_map('preg_quote_cb', $style);
+        $data = array_map('preg_quote_cb', $data);
+
+        // join
+        $user = join('|', $user);
+        $style = join('|', $style);
+        $data = join('|', $data);
+
+        // any data at all?
+        if ($user . $style . $data === '') {
+            throw new Exception('no data passed');
+        }
+
+        // replace empty values, set which ones are optional
+        $sopt = '';
+        $dopt = '';
+        if ($user === '') {
+            $user = '\S+';
+        }
+        if ($style === '') {
+            $style = '\S+';
+            $sopt = '?';
+        }
+        if ($data === '') {
+            $data = '\S+';
+            $dopt = '?';
+        }
+
+        // assemble
+        return "/^($user)(?:\\s+($style))$sopt(?:\\s+($data))$dopt$/";
+    }
+}