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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Aiken format question importer.
  19   *
  20   * @package    qformat_aiken
  21   * @copyright  2003 Tom Robb <tom@robb.net>
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  
  29  /**
  30   * Aiken format - a simple format for creating multiple choice questions (with
  31   * only one correct choice, and no feedback).
  32   *
  33   * The format looks like this:
  34   *
  35   * Question text
  36   * A) Choice #1
  37   * B) Choice #2
  38   * C) Choice #3
  39   * D) Choice #4
  40   * ANSWER: B
  41   *
  42   * That is,
  43   *  + question text all one one line.
  44   *  + then a number of choices, one to a line. Each line must comprise a letter,
  45   *    then ')' or '.', then a space, then the choice text.
  46   *  + Then a line of the form 'ANSWER: X' to indicate the correct answer.
  47   *
  48   * Be sure to word "All of the above" type choices like "All of these" in
  49   * case choices are being shuffled.
  50   *
  51   * @copyright  2003 Tom Robb <tom@robb.net>
  52   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  53   */
  54  class qformat_aiken extends qformat_default {
  55  
  56      public function provide_import() {
  57          return true;
  58      }
  59  
  60      public function readquestions($lines) {
  61          $questions = array();
  62          $question = $this->defaultquestion();
  63          $endchar = chr(13);
  64          foreach ($lines as $line) {
  65              $stp = strpos($line, $endchar, 0);
  66              $newlines = explode($endchar, $line);
  67              $linescount = count($newlines);
  68              for ($i=0; $i < $linescount; $i++) {
  69                  $nowline = trim($newlines[$i]);
  70                  // Go through the array and build an object called $question
  71                  // When done, add $question to $questions.
  72                  if (strlen($nowline) < 2) {
  73                      continue;
  74                  }
  75                  if (preg_match('/^[A-Z][).][ \t]/', $nowline)) {
  76                      // A choice. Trim off the label and space, then save.
  77                      $question->answer[] = $this->text_field(
  78                              htmlspecialchars(trim(substr($nowline, 2)), ENT_NOQUOTES));
  79                      $question->fraction[] = 0;
  80                      $question->feedback[] = $this->text_field('');
  81                  } else if (preg_match('/^ANSWER:/', $nowline)) {
  82                      // The line that indicates the correct answer. This question is finised.
  83                      $ans = trim(substr($nowline, strpos($nowline, ':') + 1));
  84                      $ans = substr($ans, 0, 1);
  85                      // We want to map A to 0, B to 1, etc.
  86                      $rightans = ord($ans) - ord('A');
  87                      $question->fraction[$rightans] = 1;
  88                      $questions[] = $question;
  89  
  90                      // Clear array for next question set.
  91                      $question = $this->defaultquestion();
  92                      continue;
  93                  } else {
  94                      // Must be the first line of a new question, since no recognised prefix.
  95                      $question->qtype = 'multichoice';
  96                      $question->name = $this->create_default_question_name($nowline, get_string('questionname', 'question'));
  97                      $question->questiontext = htmlspecialchars(trim($nowline), ENT_NOQUOTES);
  98                      $question->questiontextformat = FORMAT_HTML;
  99                      $question->generalfeedback = '';
 100                      $question->generalfeedbackformat = FORMAT_HTML;
 101                      $question->single = 1;
 102                      $question->answer = array();
 103                      $question->fraction = array();
 104                      $question->feedback = array();
 105                      $question->correctfeedback = $this->text_field('');
 106                      $question->partiallycorrectfeedback = $this->text_field('');
 107                      $question->incorrectfeedback = $this->text_field('');
 108                  }
 109              }
 110          }
 111          return $questions;
 112      }
 113  
 114      protected function text_field($text) {
 115          return array(
 116              'text' => htmlspecialchars(trim($text), ENT_NOQUOTES),
 117              'format' => FORMAT_HTML,
 118              'files' => array(),
 119          );
 120      }
 121  
 122      public function readquestion($lines) {
 123          // This is no longer needed but might still be called by default.php.
 124          return;
 125      }
 126  }
 127  
 128