From: thepurpleblob <thepurpleblob>
Date: Thu, 27 Jan 2005 11:22:45 +0000 (+0000)
Subject: Addition code to handle 'multianswerchoice' type Learnwise questions.
X-Git-Url: http://git.mjollnir.org/gw?a=commitdiff_plain;h=2d4aa134d5d8e9c25f7a10797915013d0e0a8ac5;p=moodle.git

Addition code to handle 'multianswerchoice' type Learnwise questions.
---

diff --git a/mod/quiz/format/learnwise/format.php b/mod/quiz/format/learnwise/format.php
index ce0fcc0816..363f69e9e2 100755
--- a/mod/quiz/format/learnwise/format.php
+++ b/mod/quiz/format/learnwise/format.php
@@ -1,109 +1,144 @@
-<?PHP  // $Id$ 
-// Alton College, Hampshire, UK - Tom Flannaghan
-// Imports learnwise multiple choice quizzes
+<?php    // $Id$ 
+// Alton College, Hampshire, UK - Tom Flannaghan, Andrew Walker
+// Imports learnwise multiple choice quizzes (single and multiple answers)
+// currently ignores the deduct attribute for multiple answer questions
+// deductions are currently simply found by dividing the award for the incorrect 
+// answer by the total number of options
 // Based on format.php, included by ../../import.php
 
-function string_between($text, $start, $end)
-{
-	$startpos = strpos($text, $start) + strlen($start);
-	$endpos = strpos($text, $end);
-	
-	if($startpos <= $endpos) return substr($text, $startpos, $endpos - $startpos);
-}
-	
-	
-
 class quiz_file_format extends quiz_default_format {
 
-	function readquestions($lines) {
+    function readquestions($lines) {
         $questions = array();
         $currentquestion = array();
 		
-		foreach($lines as $line) {
-			$line = trim($line);
-			$currentquestion[] = $line;
+        foreach($lines as $line) {
+            $line = trim($line);
+            $currentquestion[] = $line;
 			
-			if($question = $this->readquestion($currentquestion)) {
-				$questions[] = $question;
-				$currentquestion = array();
-			}
-		}
-				
-		return $questions;
-	}
-
-        function unhtmlentities($string)
-        // puts all the &gt; etc stuff back to 'normal' 
-        // good for PHP 4.1.0 on
-        {
-          $trans_tbl = get_html_translation_table(HTML_ENTITIES);
-          $trans_tbl = array_flip($trans_tbl);
-          return strtr($string, $trans_tbl);
-        }
+            if ($question = $this->readquestion($currentquestion)) {
+                $questions[] = $question;
+                $currentquestion = array();
+            }
+        }				
+        return $questions;
+    }
 
     function readquestion($lines) {
-		$text = '';
-		foreach ($lines as $line) $text .= $line;
-		$text = str_replace(array('\t','\n','\r','\''), array('','','','\\\''), $text);
-		$len = strlen($text);
-
-		$question = NULL;
-
-		if($questiontype = sscanf($text, '<question type="%s">'))
-		{
-			if($pos = stripos($text, '</question>'))
-			{
-				$text = substr($text, 0, $pos);
-				$text = stristr($text, '<question');
-				
-				$questiontext = '';
-				$questionaward = '';
-				$questionhint = '';
-				$optionlist = '';
-				$questiontext = string_between($text, '<text>', '</text>');
-				$questionaward = string_between($text, '<award>', '</award>');
-				$questionhint = string_between($text, '<hint>', '</hint>');
-				$optionlist = string_between($text, '<answer>', '</answer>');
-				
-				$optionlist = explode('<option', $optionlist);
-				$n=0;
-				
-				foreach($optionlist as $option)
-				{
-					$a = string_between($option, ' correct="', '">');
-					$b = string_between($option, '">', '</option>');
-					
-					$options_correct[$n] = $a; $options_text[$n] = $b;
-					//echo "$a, $b<br>";
-					$n++;
-					
-				}
-				
-				$question->qtype = MULTICHOICE;
-				$question->name = substr($this->unhtmlentities($questiontext),0,30);
-				if(strlen($questionlen)<30) $question->name .= '...';
-				$question->questiontext = $this->unhtmlentities($questiontext);
-				$question->single = 1;
-				$question->feedback[] = '';
-				$question->usecase = 0;
-				$question->defaultgrade = 1;
-				$question->image = '';
-				
-				for($n=0; $n<sizeof($options_text); $n++)
-				{
-					if($options_text[$n])
-					{
-						if($options_correct[$n]=='yes') $fraction = (int) $questionaward; else $fraction = 0;
-						$question->fraction[] = $fraction;
-						$question->answer[] = $this->unhtmlentities($options_text[$n]);
-						//echo "hello: $options_text[$n], $fraction<br>";
-					}
-				}
-			}
-		}
-		
+        $text = implode(' ', $lines);
+        $text = str_replace(array('\t','\n','\r','\''), array('','','','\\\''), $text);
+
+        $startpos = strpos($text, '<question type');
+        $endpos = strpos($text, '</question>');
+        if ($startpos === false || $endpos === false) {
+            return false;
+        }
+
+        preg_match("/<question type=[\"\']([^\"\']+)[\"\']>/i", $text, $matches);
+        $type = strtolower($matches[1]); // multichoice or multianswerchoice
+
+        $questiontext = $this->unhtmlentities($this->stringbetween($text, '<text>', '</text>'));
+        $questionhint = $this->unhtmlentities($this->stringbetween($text, '<hint>', '</hint>'));
+        $questionaward = $this->stringbetween($text, '<award>', '</award>');
+        $optionlist = $this->stringbetween($text, '<answer>', '</answer>');
+
+        $optionlist = explode('<option', $optionlist);
+
+        $n = 0;
+
+        $optionscorrect = array();
+        $optionstext = array();
+
+        if ($type == 'multichoice') {
+            foreach ($optionlist as $option) {
+                $correct = $this->stringbetween($option, ' correct="', '">');
+                $answer = $this->stringbetween($option, '">', '</option>');
+                $optionscorrect[$n] = $correct; 
+                $optionstext[$n] = $this->unhtmlentities($answer);
+                ++$n;
+            }
+        } else if ($type == 'multianswerchoice') {
+            $numcorrect = 0;
+            $totalaward = 0;
+
+            $optionsaward = array();
+
+            foreach ($optionlist as $option) {
+                preg_match("/correct=\"([^\"]*)\"/i", $option, $correctmatch);
+                preg_match("/award=\"([^\"]*)\"/i", $option, $awardmatch);
+
+                $correct = $correctmatch[1];
+                $award = $awardmatch[1];
+                if ($correct == 'yes') {
+                    $totalaward += $award;
+                    ++$numcorrect;
+                }
+
+                $answer = $this->stringbetween($option, '">', '</option>');
+
+                $optionscorrect[$n] = $correct; 
+                $optionstext[$n] = $this->unhtmlentities($answer);
+                $optionsaward[$n] = $award;
+                ++$n;
+            }
+
+        } else {
+            echo "<p>I don't understand this question type (type = <strong>$type</strong>).</p>\n";
+        }
+
+        $question->qtype = MULTICHOICE;
+        $question->name = substr($questiontext, 0, 30);
+        if (strlen($questiontext) > 30) {
+            $question->name .= '...';
+        }
+
+        $question->questiontext = $questiontext;
+        $question->single = ($type == 'multichoice') ? 1 : 0;
+        $question->feedback[] = '';
+        $question->usecase = 0;
+        $question->defaultgrade = 1;
+        $question->image = '';
+			
+        $question->fraction = array();
+        $question->answer = array();
+        for ($n = 0; $n < count($optionstext); ++$n) {
+            if ($optionstext[$n]) {
+                if (!isset($numcorrect)) { // single answer
+                    if ($optionscorrect[$n] == 'yes') {
+                        $fraction = (int) $questionaward; 
+                    } else {
+                        $fraction = 0;
+                    } 
+                } else { // mulitple answers
+                    if ($optionscorrect[$n] == 'yes') {
+                        $fraction = $optionsaward[$n] / $totalaward; 
+                    } else {
+                        $fraction = -$optionsaward[$n] / count($optionstext);
+                    }
+                }
+                $question->fraction[] = $fraction;
+                $question->answer[] = $optionstext[$n];
+            }
+        }
+
         return $question;
     }
+
+    function stringbetween($text, $start, $end) {
+        $startpos = strpos($text, $start) + strlen($start);
+        $endpos = strpos($text, $end);
+	
+        if ($startpos <= $endpos) {
+            return substr($text, $startpos, $endpos - $startpos);
+        }
+    }
+
+    function unhtmlentities($string) {
+        $transtable = get_html_translation_table(HTML_ENTITIES);
+        $transtable = array_flip($transtable);
+        return strtr($string, $transtable);
+    } 
+
 }
 
 ?>