From: tjhunt <tjhunt>
Date: Wed, 7 Jan 2009 09:26:47 +0000 (+0000)
Subject: quiz editing: MDL-17416 Clean layout when starting a new attempt.
X-Git-Url: http://git.mjollnir.org/gw?a=commitdiff_plain;h=edd5246bddb5d19b7fabef8f63e87e69e5419a87;p=moodle.git

quiz editing: MDL-17416 Clean layout when starting a new attempt.
---

diff --git a/mod/quiz/attemptlib.php b/mod/quiz/attemptlib.php
index 47fa2c720b..821469da86 100644
--- a/mod/quiz/attemptlib.php
+++ b/mod/quiz/attemptlib.php
@@ -319,7 +319,7 @@ class quiz {
         }
 
         // Break up the layout string into pages.
-        $pagelayouts = explode(',0', $layout);
+        $pagelayouts = explode(',0', quiz_clean_layout($layout, true));
 
         // Strip off any empty last page (normally there is one).
         if (end($pagelayouts) == '') {
diff --git a/mod/quiz/locallib.php b/mod/quiz/locallib.php
index 4121f2e25a..3770cb66f1 100644
--- a/mod/quiz/locallib.php
+++ b/mod/quiz/locallib.php
@@ -1147,48 +1147,43 @@ function quiz_send_notification_emails($course, $quiz, $attempt, $context, $cm)
  * @param boolean $removeemptypages If true, remove empty pages from the quiz. False by default.
  * @return $string the cleaned-up layout
  */
-function quiz_clean_layout($layout,$removeemptypages=false){
-    //remove duplicate "," (or triple, or...)
-    while(strstr($layout,",,")){
-        $layout = str_replace(',,', ',', $layout);
-    }
-    //remove duplicate question ids
-    $layout_arr=explode(",",$layout);
-    $new_arr=array();
-    $seen=array();
-    foreach($layout_arr as $key=>$value){
-         if(!in_array($value,$seen) && $value!=0){
-             $new_arr[]=$value;
-             $seen[]=$value;
-         }else if($value==0){
-             $new_arr[]=0;
-         }
+function quiz_clean_layout($layout, $removeemptypages = false){
+    // Remove duplicate "," (or triple, or...)
+    $layout = preg_replace('/,{2,}/', ',', trim($layout, ','));
+
+    // Remove duplicate question ids
+    $layout = explode(',', $layout);
+    $cleanerlayout = array();
+    $seen = array();
+    foreach ($layout as $item) {
+        if ($item == 0) {
+            $cleanerlayout[] = '0';
+        } else if (!in_array($item, $seen)) {
+            $cleanerlayout[] = $item;
+            $seen[] = $item;
+        }
     }
-    if($removeemptypages){
+
+    if ($removeemptypages) {
         // Avoid duplicate page breaks
-        // Go through all the array keys
-        for($i=0;$i<count($new_arr);$i++){
-            //check if the current position and the one after are both zeros
-            //remove the one after until they are not both zeros
-                while(isset($new_arr[$i+1]) &&
-                        $new_arr[$i]==0 &&
-                        $new_arr[$i+1]==0){
-                    array_splice($new_arr,$i+1,1);
-                }
+        $layout = $cleanerlayout;
+        $cleanerlayout = array();
+        $stripfollowingbreaks = true; // Ensure breaks are stripped from the start.
+        foreach ($layout as $item) {
+            if ($stripfollowingbreaks && $item == 0) {
+                continue;
+            }
+            $cleanerlayout[] = $item;
+            $stripfollowingbreaks = $item == 0;
         }
     }
-    $layout=implode(",",$new_arr);
-    //remove extra "," from beginning and end
-    $layout=trim($layout, ",");
-    //add a ",0" (page break) at the end if there is none
-    $layoutlength=strlen($layout);
-    $last=(strlen($layout)-1);
-    if($layoutlength>1 AND
-            !($layout[$last-1] == ',' AND $layout[$last] == '0')){
-        $layout .= ',0';
+
+    // Add a page break at the end if there is none
+    if (end($cleanerlayout) !== '0') {
+        $cleanerlayout[] = '0';
     }
 
-    return $layout;
+    return implode(',', $cleanerlayout);
 }
 /**
  * Print a quiz error message. This is a thin wrapper around print_error, for convinience.
diff --git a/mod/quiz/simpletest/testlocallib.php b/mod/quiz/simpletest/testlocallib.php
index 833d5d68dc..75beb6830d 100644
--- a/mod/quiz/simpletest/testlocallib.php
+++ b/mod/quiz/simpletest/testlocallib.php
@@ -48,5 +48,28 @@ class quiz_locallib_test extends MoodleUnitTestCase {
         $this->assertEqual(quiz_number_of_questions_in_quiz('1,2,3,0'), 3);
         $this->assertEqual(quiz_number_of_questions_in_quiz('0,1,0,0,2,0'), 2);
     }
+
+    function test_quiz_clean_layout() {
+        // Without stripping empty pages.
+        $this->assertEqual(quiz_clean_layout(',,1,,,2,,'), '1,2,0');
+        $this->assertEqual(quiz_clean_layout(''), '0');
+        $this->assertEqual(quiz_clean_layout('0'), '0');
+        $this->assertEqual(quiz_clean_layout('0,0'), '0,0');
+        $this->assertEqual(quiz_clean_layout('0,0,0'), '0,0,0');
+        $this->assertEqual(quiz_clean_layout('1'), '1,0');
+        $this->assertEqual(quiz_clean_layout('1,2'), '1,2,0');
+        $this->assertEqual(quiz_clean_layout('1,0,2'), '1,0,2,0');
+        $this->assertEqual(quiz_clean_layout('0,1,0,0,2,0'), '0,1,0,0,2,0');
+
+        // With stripping empty pages.
+        $this->assertEqual(quiz_clean_layout('', true), '0');
+        $this->assertEqual(quiz_clean_layout('0', true), '0');
+        $this->assertEqual(quiz_clean_layout('0,0', true), '0');
+        $this->assertEqual(quiz_clean_layout('0,0,0', true), '0');
+        $this->assertEqual(quiz_clean_layout('1', true), '1,0');
+        $this->assertEqual(quiz_clean_layout('1,2', true), '1,2,0');
+        $this->assertEqual(quiz_clean_layout('1,0,2', true), '1,0,2,0');
+        $this->assertEqual(quiz_clean_layout('0,1,0,0,2,0', true), '1,0,2,0');
+    }
 }
 ?>
\ No newline at end of file