From 9f9193f623a34f3cb0da89e07259be9129d76cc7 Mon Sep 17 00:00:00 2001
From: Petr Skoda <skodak@moodle.org>
Date: Tue, 13 Apr 2010 20:14:31 +0000
Subject: [PATCH] MDL-22061 new string_exists() method - this can be used in
 some corner cases

---
 lib/moodlelib.php | 55 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 52 insertions(+), 3 deletions(-)

diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 105f1a65363..91a47087853 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -5701,6 +5701,20 @@ interface string_manager {
      */
     public function get_string($identifier, $component = '', $a = NULL);
 
+    /**
+     * Does the string actually exist?
+     *
+     * get_string() is throwing debug warnings, sometimes we do not want them
+     * or we want to display better explanation of the problem.
+     *
+     * Use with care!
+     *
+     * @param string $identifier The identifier of the string to search for
+     * @param string $component The module the string is associated with
+     * @return boot true if exists
+     */
+    public function string_exists($identifier, $component);
+    
     /**
      * Returns a list of country names in the current language
      * @return array two-letter country code => translated name.
@@ -5803,7 +5817,6 @@ class core_string_manager implements string_manager {
             $string = array();
             // first load english pack
             if (!file_exists("$CFG->dirroot/lang/en/$file.php")) {
-                debugging("Invalid component parameter in get_string() call: $component", DEBUG_DEVELOPER);
                 return array();
             }
             include("$CFG->dirroot/lang/en/$file.php");
@@ -5828,7 +5841,6 @@ class core_string_manager implements string_manager {
 
         } else {
             if (!$location = get_plugin_directory($plugintype, $pluginname) or !is_dir($location)) {
-                debugging("Invalid component parameter in get_string() call, plugin files are missing: $component", DEBUG_DEVELOPER);
                 return array();
             }
             if ($plugintype === 'mod') {
@@ -5840,7 +5852,7 @@ class core_string_manager implements string_manager {
             $string = array();
             // first load english pack
             if (!file_exists("$location/lang/en/$file.php")) {
-                //english pack does not exist, so do not try to laod anything else
+                //english pack does not exist, so do not try to load anything else
                 return array();
             }
             include("$location/lang/en/$file.php");
@@ -5873,6 +5885,24 @@ class core_string_manager implements string_manager {
         return $string;
     }
 
+    /**
+     * Does the string actually exist?
+     *
+     * get_string() is throwing debug warnings, sometimes we do not want them
+     * or we want to display better explanation of the problem.
+     *
+     * Use with care!
+     *
+     * @param string $identifier The identifier of the string to search for
+     * @param string $component The module the string is associated with
+     * @return boot true if exists
+     */
+    public function string_exists($identifier, $component) {
+        $lang = current_language();
+        $string = $this->load_component_strings($component, $lang);
+        return isset($string[$identifier]);
+    }
+
     /**
      * Get String returns a requested string
      *
@@ -6054,9 +6084,28 @@ class install_string_manager implements string_manager {
      * @return array of all string for given component and lang
      */
     public function load_component_strings($component, $lang) {
+        // not needed in installer
         return array();
     }
 
+    /**
+     * Does the string actually exist?
+     *
+     * get_string() is throwing debug warnings, sometimes we do not want them
+     * or we want to display better explanation of the problem.
+     *
+     * Use with care!
+     *
+     * @param string $identifier The identifier of the string to search for
+     * @param string $component The module the string is associated with
+     * @return boot true if exists
+     */
+    public function string_exists($identifier, $component) {
+        // simple old style hack ;)
+        $str = get_string($identifier, $component);
+        return (strpos($str, '[[') === false);
+    }
+
     /**
      * Get String returns a requested string
      *