add new mode to improve name extraction

This commit improves the name extraction by adding `db2` as an alternative mode.
- if there is more than one valid name bit, the last bit will always be the last name
- name bits following the first bit recognised as a last name will not become first names again

CRM/Banking/PluginImpl/Matcher/GetOrCreateContactAnalyser.php

@@ -279,6 +279,33 @@ protected function applyNameExtraction($btx, &$xcm_values, $name_mode)
         $xcm_values['last_name'] = implode(' ', $last_names);
         break;
 
+      // See PR #112
+      case 'db2':
+        $first_names = [];
+        $last_names = [];
+        foreach ($name_bits as $name_bit) {
+            if (!$this->isNameBlacklisted($name_bit, $config->name_blacklist)) {
+                if ((!$this->isNameBlacklisted($name_bit, $config->first_name_blacklist))
+                    && $this->isDBFirstName($name_bit)
+                    && empty($last_names)) {
+                    $first_names[] = $name_bit;
+                } else {
+                    $last_names[] = $name_bit;
+                }
+            }
+        }
+
+        // If we didn't find any last names, but we found more than one first name,
+        // then we assume that the last one is the last name of the contact
+        if (empty($last_names) && count($first_names) > 1) {
+            $last_names[] = array_pop($first_names);
+        }
+
+        $this->logMessage("Identified (by DB) first names of '{$btx_name}' are: " . implode(',', $first_names), 'debug');
+        $xcm_values['first_name'] = implode(' ', $first_names);
+        $xcm_values['last_name'] = implode(' ', $last_names);
+        break;
+
       default:
       case 'off':
         break;