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351 lines
10 KiB
351 lines
10 KiB
<?php // $Id: $
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/* For licensing terms, see /license.txt */
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/**
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* @author Claro Team <cvs@claroline.net>
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* @author Amand Tihon <amand@alrj.org>
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* @author Sebastien Piraux <pir@cerdecam.be>
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* @author Yannick Warnier <yannick.warnier@beeznest.com>
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* @package chamilo.exercise.qti
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*/
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/**
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* Code
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*/
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if ( count( get_included_files() ) == 1 ) die( '---' );
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include dirname(__FILE__) . '/qti_classes.php';
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/*--------------------------------------------------------
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Classes
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--------------------------------------------------------*/
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/**
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* This class represents an entire exercise to be exported in IMS/QTI.
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* It will be represented by a single <section> containing several <item>.
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*
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* Some properties cannot be exported, as IMS does not support them :
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* - type (one page or multiple pages)
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* - start_date and end_date
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* - max_attempts
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* - show_answer
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* - anonymous_attempts
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*
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* @author Amand Tihon <amand@alrj.org>
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* @package chamilo.exercise.qti
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*/
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class ImsSection
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{
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var $exercise;
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/**
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* Constructor.
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* @param $exe The Exercise instance to export
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* @author Amand Tihon <amand@alrj.org>
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*/
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function ImsSection($exe)
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{
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$this->exercise = $exe;
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}
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function start_section()
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{
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$out = '<section ident="EXO_' . $this->exercise->getId() . '" title="' . $this->exercise->getTitle() . '">' . "\n";
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return $out;
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}
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function end_section()
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{
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return "</section>\n";
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}
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function export_duration()
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{
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if ($max_time = $this->exercise->getTimeLimit())
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{
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// return exercise duration in ISO8601 format.
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$minutes = floor($max_time / 60);
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$seconds = $max_time % 60;
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return '<duration>PT' . $minutes . 'M' . $seconds . "S</duration>\n";
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}
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else
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{
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return '';
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}
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}
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/**
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* Export the presentation (Exercise's description)
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export_presentation()
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{
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$out = "<presentation_material><flow_mat><material>\n"
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. " <mattext><![CDATA[" . $this->exercise->getDescription() . "]]></mattext>\n"
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. "</material></flow_mat></presentation_material>\n";
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return $out;
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}
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/**
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* Export the ordering information.
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* Either sequential, through all questions, or random, with a selected number of questions.
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export_ordering()
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{
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$out = '';
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if ($n = $this->exercise->getShuffle()) {
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$out.= "<selection_ordering>"
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. " <selection>\n"
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. " <selection_number>" . $n . "</selection_number>\n"
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. " </selection>\n"
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. ' <order order_type="Random" />'
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. "\n</selection_ordering>\n";
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}
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else
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{
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$out.= '<selection_ordering sequence_type="Normal">' . "\n"
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. " <selection />\n"
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. "</selection_ordering>\n";
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}
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return $out;
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}
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/**
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* Export the questions, as a succession of <items>
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export_questions()
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{
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$out = "";
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foreach ($this->exercise->getQuestionList() as $q)
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{
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$out .= export_question($q['id'], False);
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}
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return $out;
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}
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/**
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* Export the exercise in IMS/QTI.
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*
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* @param bool $standalone Wether it should include XML tag and DTD line.
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* @return a string containing the XML flow
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export($standalone)
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{
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global $charset;
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$head = $foot = "";
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if ($standalone) {
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$head = '<?xml version = "1.0" encoding = "' . $charset . '" standalone = "no"?>' . "\n"
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. '<!DOCTYPE questestinterop SYSTEM "ims_qtiasiv1p2p1.dtd">' . "\n"
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. "<questestinterop>\n";
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$foot = "</questestinterop>\n";
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}
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$out = $head
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. $this->start_section()
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. $this->export_duration()
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. $this->export_presentation()
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. $this->export_ordering()
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. $this->export_questions()
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. $this->end_section()
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. $foot;
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return $out;
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}
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}
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/*
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Some quick notes on identifiers generation.
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The IMS format requires some blocks, like items, responses, feedbacks, to be uniquely
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identified.
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The unicity is mandatory in a single XML, of course, but it's prefered that the identifier stays
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coherent for an entire site.
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Here's the method used to generate those identifiers.
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Question identifier :: "QST_" + <Question Id from the DB> + "_" + <Question numeric type>
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Response identifier :: <Question identifier> + "_A_" + <Response Id from the DB>
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Condition identifier :: <Question identifier> + "_C_" + <Response Id from the DB>
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Feedback identifier :: <Question identifier> + "_F_" + <Response Id from the DB>
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*/
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/**
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* An IMS/QTI item. It corresponds to a single question.
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* This class allows export from Claroline to IMS/QTI XML format.
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* It is not usable as-is, but must be subclassed, to support different kinds of questions.
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*
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* Every start_*() and corresponding end_*(), as well as export_*() methods return a string.
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*
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* Warning: Attached files are NOT exported.
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* @package chamilo.exercise.qti
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* @author Amand Tihon <amand@alrj.org>
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*/
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class ImsItem
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{
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var $question;
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var $question_ident;
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var $answer;
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/**
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* Constructor.
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*
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* @param $question The Question object we want to export.
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* @author Anamd Tihon
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*/
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function ImsItem($question)
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{
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$this->question = $question;
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$this->answer = $question->answer;
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$this->questionIdent = "QST_" . $question->getId() ;
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}
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/**
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* Start the XML flow.
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*
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* This opens the <item> block, with correct attributes.
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*
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* @author Amand Tihon <amand@alrj.org>
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*/
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function start_item()
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{
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return '<item title="' . htmlspecialchars($this->question->getTitle()) . '" ident="' . $this->questionIdent . '">' . "\n";
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}
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/**
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* End the XML flow, closing the </item> tag.
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*
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* @author Amand Tihon <amand@alrj.org>
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*/
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function end_item()
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{
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return "</item>\n";
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}
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/**
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* Create the opening, with the question itself.
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*
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* This means it opens the <presentation> but doesn't close it, as this is the role of end_presentation().
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* Inbetween, the export_responses from the subclass should have been called.
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*
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* @author Amand Tihon <amand@alrj.org>
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*/
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function start_presentation()
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{
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return '<presentation label="' . $this->questionIdent . '"><flow>' . "\n"
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. '<material><mattext><![CDATA[' . $this->question->getDescription() . "]]></mattext></material>\n";
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}
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/**
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* End the </presentation> part, opened by export_header.
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*
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* @author Amand Tihon <amand@alrj.org>
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*/
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function end_presentation()
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{
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return "</flow></presentation>\n";
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}
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/**
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* Start the response processing, and declare the default variable, SCORE, at 0 in the outcomes.
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*
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* @author Amand Tihon <amand@alrj.org>
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*/
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function start_processing()
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{
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return '<resprocessing><outcomes><decvar vartype="Integer" defaultval="0" /></outcomes>' . "\n";
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}
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/**
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* End the response processing part.
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*
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* @author Amand Tihon <amand@alrj.org>
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*/
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function end_processing()
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{
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return "</resprocessing>\n";
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}
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/**
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* Export the question as an IMS/QTI Item.
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*
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* This is a default behaviour, some classes may want to override this.
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*
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* @param $standalone: Boolean stating if it should be exported as a stand-alone question
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* @return A string, the XML flow for an Item.
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export($standalone = False)
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{
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global $charset;
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$head = $foot = "";
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if( $standalone )
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{
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$head = '<?xml version = "1.0" encoding = "'.$charset.'" standalone = "no"?>' . "\n"
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. '<!DOCTYPE questestinterop SYSTEM "ims_qtiasiv1p2p1.dtd">' . "\n"
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. "<questestinterop>\n";
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$foot = "</questestinterop>\n";
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}
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return $head
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. $this->start_item()
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. $this->start_presentation()
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. $this->answer->imsExportResponses($this->questionIdent)
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. $this->end_presentation()
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. $this->start_processing()
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. $this->answer->imsExportProcessing($this->questionIdent)
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. $this->end_processing()
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. $this->answer->imsExportFeedback($this->questionIdent)
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. $this->end_item()
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. $foot;
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}
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}
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/*--------------------------------------------------------
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Functions
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--------------------------------------------------------*/
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/**
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* Send a complete exercise in IMS/QTI format, from its ID
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*
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* @param int $exerciseId The exercise to exporte
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* @param boolean $standalone Wether it should include XML tag and DTD line.
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* @return The XML as a string, or an empty string if there's no exercise with given ID.
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export_exercise($exerciseId, $standalone=True)
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{
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$exercise = new Exercise();
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if (! $exercise->load($exerciseId))
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{
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return '';
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}
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$ims = new ImsSection($exercise);
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$xml = $ims->export($standalone);
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return $xml;
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}
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/**
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* Returns the XML flow corresponding to one question
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*
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* @param int The question ID
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* @param bool standalone (ie including XML tag, DTD declaration, etc)
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* @author Amand Tihon <amand@alrj.org>
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*/
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function export_question($questionId, $standalone=True)
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{
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$question = new ImsQuestion();
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if( !$question->load($questionId) )
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{
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return '';
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}
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$ims = new ImsItem($question);
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return $ims->export($standalone);
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}
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?>
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