filters: MDL-7336 backup and restore of local filter settings.

lib/filterlib.php

@@ -586,6 +586,23 @@ function filter_get_local_config($filter, $contextid) {
     return $DB->get_records_menu('filter_config', array('filter' => $filter, 'contextid' => $contextid), '', 'name,value');
 }
 
+/**
+ * This function is for use by backup. Gets all the filter information specific
+ * to one context.
+ * @return array with two elements. The first element is an array of objects with
+ *      fields filter and active. These come from the filter_active table. The
+ *      second element is an array of objects with fields filter, name and value
+ *      from the filter_config table.
+ */
+function filter_get_all_local_settings($contextid) {
+    global $DB;
+    $context = get_context_instance(CONTEXT_SYSTEM);
+    return array(
+        $DB->get_records('filter_active', array('contextid' => $contextid), 'filter', 'filter,active'),
+        $DB->get_records('filter_config', array('contextid' => $contextid), 'filter,name', 'filter,name,value'),
+    );
+}
+
 /**
  * Get the list of active filters, in the order that they should be used
  * for a particular context, along with any local configuration variables.
@@ -670,6 +687,16 @@ function filter_has_global_settings($filter) {
     return is_readable($settingspath);
 }
 
+/**
+ * Certain types of context (block and user) may not have local filter settings.
+ * the function checks a context to see whether it may have local config.
+ * @param object $context a context.
+ * @return boolean whether this context may have local filter settings.
+ */
+function filter_context_may_have_filter_settings($context) {
+    return $context->contextlevel != CONTEXT_BLOCK && $context->contextlevel != CONTEXT_USER;
+}
+
 /**
  * Process phrases intelligently found within a HTML text (such as adding links)
  *