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Differences Between: [Versions 39 and 402]

   1  <?php
   2  
   3  // This file is part of Moodle - http://moodle.org/
   4  //
   5  // Moodle is free software: you can redistribute it and/or modify
   6  // it under the terms of the GNU General Public License as published by
   7  // the Free Software Foundation, either version 3 of the License, or
   8  // (at your option) any later version.
   9  //
  10  // Moodle is distributed in the hope that it will be useful,
  11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  // GNU General Public License for more details.
  14  //
  15  // You should have received a copy of the GNU General Public License
  16  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17  
  18  require_once($CFG->dirroot.'/lib/gradelib.php');
  19  require_once($CFG->dirroot.'/grade/lib.php');
  20  require_once($CFG->dirroot.'/grade/export/grade_export_form.php');
  21  
  22  /**
  23   * Base export class
  24   */
  25  abstract class grade_export {
  26  
  27      /** @var int Value to state nothing is being exported. */
  28      protected const EXPORT_SELECT_NONE = -1;
  29  
  30      public $plugin; // plgin name - must be filled in subclasses!
  31  
  32      public $grade_items; // list of all course grade items
  33      public $groupid;     // groupid, 0 means all groups
  34      public $course;      // course object
  35      public $columns;     // array of grade_items selected for export
  36  
  37      public $export_letters;  // export letters
  38      public $export_feedback; // export feedback
  39      public $userkey;         // export using private user key
  40  
  41      public $updatedgradesonly; // only export updated grades
  42  
  43      /**
  44       *  Grade display type (real, percentages or letter).
  45       *
  46       *  This attribute is an integer for XML file export. Otherwise is an array for all other formats (ODS, XLS and TXT).
  47       *
  48       *  @var $displaytype Grade display type constant (1, 2 or 3) or an array of display types where the key is the name
  49       *                    and the value is the grade display type constant or 0 for unchecked display types.
  50       * @access public.
  51       */
  52      public $displaytype;
  53      public $decimalpoints; // number of decimal points for exports
  54      public $onlyactive; // only include users with an active enrolment
  55      public $usercustomfields; // include users custom fields
  56  
  57      /**
  58       * @deprecated since Moodle 2.8
  59       * @var $previewrows Number of rows in preview.
  60       */
  61      public $previewrows;
  62  
  63      /**
  64       * Constructor should set up all the private variables ready to be pulled.
  65       *
  66       * This constructor used to accept the individual parameters as separate arguments, in
  67       * 2.8 this was simplified to just accept the data from the moodle form.
  68       *
  69       * @access public
  70       * @param object $course
  71       * @param int $groupid
  72       * @param stdClass|null $formdata
  73       * @note Exporting as letters will lead to data loss if that exported set it re-imported.
  74       */
  75      public function __construct($course, $groupid, $formdata) {
  76          if (func_num_args() != 3 || ($formdata != null && get_class($formdata) != "stdClass")) {
  77              $args = func_get_args();
  78              return call_user_func_array(array($this, "deprecated_constructor"), $args);
  79          }
  80          $this->course = $course;
  81          $this->groupid = $groupid;
  82  
  83          $this->grade_items = grade_item::fetch_all(array('courseid'=>$this->course->id));
  84  
  85          $this->process_form($formdata);
  86      }
  87  
  88      /**
  89       * Old deprecated constructor.
  90       *
  91       * This deprecated constructor accepts the individual parameters as separate arguments, in
  92       * 2.8 this was simplified to just accept the data from the moodle form.
  93       *
  94       * @deprecated since 2.8 MDL-46548. Instead call the shortened constructor which accepts the data
  95       * directly from the grade_export_form.
  96       */
  97      protected function deprecated_constructor($course,
  98                                                $groupid=0,
  99                                                $itemlist='',
 100                                                $export_feedback=false,
 101                                                $updatedgradesonly = false,
 102                                                $displaytype = GRADE_DISPLAY_TYPE_REAL,
 103                                                $decimalpoints = 2,
 104                                                $onlyactive = false,
 105                                                $usercustomfields = false) {
 106  
 107          debugging('Many argument constructor for class "grade_export" is deprecated. Call the 3 argument version instead.', DEBUG_DEVELOPER);
 108  
 109          $this->course = $course;
 110          $this->groupid = $groupid;
 111  
 112          $this->grade_items = grade_item::fetch_all(array('courseid'=>$this->course->id));
 113          //Populating the columns here is required by /grade/export/(whatever)/export.php
 114          //however index.php, when the form is submitted, will construct the collection here
 115          //with an empty $itemlist then reconstruct it in process_form() using $formdata
 116          $this->columns = array();
 117          if (!empty($itemlist)) {
 118              // Check that user selected something.
 119              if ($itemlist != self::EXPORT_SELECT_NONE) {
 120                  $itemids = explode(',', $itemlist);
 121                  // remove items that are not requested
 122                  foreach ($itemids as $itemid) {
 123                      if (array_key_exists($itemid, $this->grade_items)) {
 124                          $this->columns[$itemid] =& $this->grade_items[$itemid];
 125                      }
 126                  }
 127              }
 128          } else {
 129              foreach ($this->grade_items as $itemid=>$unused) {
 130                  $this->columns[$itemid] =& $this->grade_items[$itemid];
 131              }
 132          }
 133  
 134          $this->export_feedback = $export_feedback;
 135          $this->userkey         = '';
 136          $this->previewrows     = false;
 137          $this->updatedgradesonly = $updatedgradesonly;
 138  
 139          $this->displaytype = $displaytype;
 140          $this->decimalpoints = $decimalpoints;
 141          $this->onlyactive = $onlyactive;
 142          $this->usercustomfields = $usercustomfields;
 143      }
 144  
 145      /**
 146       * Init object based using data from form
 147       * @param object $formdata
 148       */
 149      function process_form($formdata) {
 150          global $USER;
 151  
 152          $this->columns = array();
 153          if (!empty($formdata->itemids)) {
 154              // Check that user selected something.
 155              if ($formdata->itemids != self::EXPORT_SELECT_NONE) {
 156                  foreach ($formdata->itemids as $itemid=>$selected) {
 157                      if ($selected and array_key_exists($itemid, $this->grade_items)) {
 158                          $this->columns[$itemid] =& $this->grade_items[$itemid];
 159                      }
 160                  }
 161              }
 162          } else {
 163              foreach ($this->grade_items as $itemid=>$unused) {
 164                  $this->columns[$itemid] =& $this->grade_items[$itemid];
 165              }
 166          }
 167  
 168          if (isset($formdata->key)) {
 169              if ($formdata->key == 1 && isset($formdata->iprestriction) && isset($formdata->validuntil)) {
 170                  // Create a new key
 171                  $formdata->key = create_user_key('grade/export', $USER->id, $this->course->id, $formdata->iprestriction, $formdata->validuntil);
 172              }
 173              $this->userkey = $formdata->key;
 174          }
 175  
 176          if (isset($formdata->decimals)) {
 177              $this->decimalpoints = $formdata->decimals;
 178          }
 179  
 180          if (isset($formdata->export_letters)) {
 181              $this->export_letters = $formdata->export_letters;
 182          }
 183  
 184          if (isset($formdata->export_feedback)) {
 185              $this->export_feedback = $formdata->export_feedback;
 186          }
 187  
 188          if (isset($formdata->export_onlyactive)) {
 189              $this->onlyactive = $formdata->export_onlyactive;
 190          }
 191  
 192          if (isset($formdata->previewrows)) {
 193              $this->previewrows = $formdata->previewrows;
 194          }
 195  
 196          if (isset($formdata->display)) {
 197              $this->displaytype = $formdata->display;
 198  
 199              // Used by grade exports which accept multiple display types.
 200              // If the checkbox value is 0 (unchecked) then remove it.
 201              if (is_array($formdata->display)) {
 202                  $this->displaytype = array_filter($formdata->display);
 203              }
 204          }
 205  
 206          if (isset($formdata->updatedgradesonly)) {
 207              $this->updatedgradesonly = $formdata->updatedgradesonly;
 208          }
 209      }
 210  
 211      /**
 212       * Update exported field in grade_grades table
 213       * @return boolean
 214       */
 215      public function track_exports() {
 216          global $CFG;
 217  
 218          /// Whether this plugin is entitled to update export time
 219          if ($expplugins = explode(",", $CFG->gradeexport)) {
 220              if (in_array($this->plugin, $expplugins)) {
 221                  return true;
 222              } else {
 223                  return false;
 224            }
 225          } else {
 226              return false;
 227          }
 228      }
 229  
 230      /**
 231       * Returns string representation of final grade
 232       * @param object $grade instance of grade_grade class
 233       * @param integer $gradedisplayconst grade display type constant.
 234       * @return string
 235       */
 236      public function format_grade($grade, $gradedisplayconst = null) {
 237          $displaytype = $this->displaytype;
 238          if (is_array($this->displaytype) && !is_null($gradedisplayconst)) {
 239              $displaytype = $gradedisplayconst;
 240          }
 241  
 242          $gradeitem = $this->grade_items[$grade->itemid];
 243  
 244          // We are going to store the min and max so that we can "reset" the grade_item for later.
 245          $grademax = $gradeitem->grademax;
 246          $grademin = $gradeitem->grademin;
 247  
 248          // Updating grade_item with this grade_grades min and max.
 249          $gradeitem->grademax = $grade->get_grade_max();
 250          $gradeitem->grademin = $grade->get_grade_min();
 251  
 252          $formattedgrade = grade_format_gradevalue($grade->finalgrade, $gradeitem, false, $displaytype, $this->decimalpoints);
 253  
 254          // Resetting the grade item in case it is reused.
 255          $gradeitem->grademax = $grademax;
 256          $gradeitem->grademin = $grademin;
 257  
 258          return $formattedgrade;
 259      }
 260  
 261      /**
 262       * Returns the name of column in export
 263       * @param object $grade_item
 264       * @param boolean $feedback feedback colum
 265       * @param string $gradedisplayname grade display name.
 266       * @return string
 267       */
 268      public function format_column_name($grade_item, $feedback=false, $gradedisplayname = null) {
 269          $column = new stdClass();
 270  
 271          if ($grade_item->itemtype == 'mod') {
 272              $column->name = get_string('modulename', $grade_item->itemmodule).get_string('labelsep', 'langconfig').$grade_item->get_name();
 273          } else {
 274              $column->name = $grade_item->get_name(true);
 275          }
 276  
 277          // We can't have feedback and display type at the same time.
 278          $column->extra = ($feedback) ? get_string('feedback') : get_string($gradedisplayname, 'grades');
 279  
 280          return html_to_text(get_string('gradeexportcolumntype', 'grades', $column), 0, false);
 281      }
 282  
 283      /**
 284       * Returns formatted grade feedback
 285       * @param object $feedback object with properties feedback and feedbackformat
 286       * @param object $grade Grade object with grade properties
 287       * @return string
 288       */
 289      public function format_feedback($feedback, $grade = null) {
 290          $string = $feedback->feedback;
 291          if (!empty($grade)) {
 292              // Rewrite links to get the export working for 36, refer MDL-63488.
 293              $string = file_rewrite_pluginfile_urls(
 294                  $feedback->feedback,
 295                  'pluginfile.php',
 296                  $grade->get_context()->id,
 297                  GRADE_FILE_COMPONENT,
 298                  GRADE_FEEDBACK_FILEAREA,
 299                  $grade->id
 300              );
 301          }
 302  
 303          return strip_tags(format_text($string, $feedback->feedbackformat));
 304      }
 305  
 306      /**
 307       * Implemented by child class
 308       */
 309      public abstract function print_grades();
 310  
 311      /**
 312       * Prints preview of exported grades on screen as a feedback mechanism
 313       * @param bool $require_user_idnumber true means skip users without idnumber
 314       * @deprecated since 2.8 MDL-46548. Previews are not useful on export.
 315       */
 316      public function display_preview($require_user_idnumber=false) {
 317          global $OUTPUT;
 318  
 319          debugging('function grade_export::display_preview is deprecated.', DEBUG_DEVELOPER);
 320  
 321          $userprofilefields = grade_helper::get_user_profile_fields($this->course->id, $this->usercustomfields);
 322          $formatoptions = new stdClass();
 323          $formatoptions->para = false;
 324  
 325          echo $OUTPUT->heading(get_string('previewrows', 'grades'));
 326  
 327          echo '<table>';
 328          echo '<tr>';
 329          foreach ($userprofilefields as $field) {
 330              echo '<th>' . $field->fullname . '</th>';
 331          }
 332          if (!$this->onlyactive) {
 333              echo '<th>'.get_string("suspended")."</th>";
 334          }
 335          foreach ($this->columns as $grade_item) {
 336              echo '<th>'.$this->format_column_name($grade_item).'</th>';
 337  
 338              /// add a column_feedback column
 339              if ($this->export_feedback) {
 340                  echo '<th>'.$this->format_column_name($grade_item, true).'</th>';
 341              }
 342          }
 343          echo '</tr>';
 344          /// Print all the lines of data.
 345          $i = 0;
 346          $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
 347          $gui->require_active_enrolment($this->onlyactive);
 348          $gui->allow_user_custom_fields($this->usercustomfields);
 349          $gui->init();
 350          while ($userdata = $gui->next_user()) {
 351              // number of preview rows
 352              if ($this->previewrows and $this->previewrows <= $i) {
 353                  break;
 354              }
 355              $user = $userdata->user;
 356              if ($require_user_idnumber and empty($user->idnumber)) {
 357                  // some exports require user idnumber so we can match up students when importing the data
 358                  continue;
 359              }
 360  
 361              $gradeupdated = false; // if no grade is update at all for this user, do not display this row
 362              $rowstr = '';
 363              foreach ($this->columns as $itemid=>$unused) {
 364                  $gradetxt = $this->format_grade($userdata->grades[$itemid]);
 365  
 366                  // get the status of this grade, and put it through track to get the status
 367                  $g = new grade_export_update_buffer();
 368                  $grade_grade = new grade_grade(array('itemid'=>$itemid, 'userid'=>$user->id));
 369                  $status = $g->track($grade_grade);
 370  
 371                  if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
 372                      $rowstr .= '<td>'.get_string('unchangedgrade', 'grades').'</td>';
 373                  } else {
 374                      $rowstr .= "<td>$gradetxt</td>";
 375                      $gradeupdated = true;
 376                  }
 377  
 378                  if ($this->export_feedback) {
 379                      $rowstr .=  '<td>'.$this->format_feedback($userdata->feedbacks[$itemid]).'</td>';
 380                  }
 381              }
 382  
 383              // if we are requesting updated grades only, we are not interested in this user at all
 384              if (!$gradeupdated && $this->updatedgradesonly) {
 385                  continue;
 386              }
 387  
 388              echo '<tr>';
 389              foreach ($userprofilefields as $field) {
 390                  $fieldvalue = grade_helper::get_user_field_value($user, $field);
 391                  // @see profile_field_base::display_data().
 392                  echo '<td>' . format_text($fieldvalue, FORMAT_MOODLE, $formatoptions) . '</td>';
 393              }
 394              if (!$this->onlyactive) {
 395                  $issuspended = ($user->suspendedenrolment) ? get_string('yes') : '';
 396                  echo "<td>$issuspended</td>";
 397              }
 398              echo $rowstr;
 399              echo "</tr>";
 400  
 401              $i++; // increment the counter
 402          }
 403          echo '</table>';
 404          $gui->close();
 405      }
 406  
 407      /**
 408       * Returns array of parameters used by dump.php and export.php.
 409       * @return array
 410       */
 411      public function get_export_params() {
 412          $itemids = array_keys($this->columns);
 413          $itemidsparam = implode(',', $itemids);
 414          if (empty($itemidsparam)) {
 415              $itemidsparam = self::EXPORT_SELECT_NONE;
 416          }
 417  
 418          // We have a single grade display type constant.
 419          if (!is_array($this->displaytype)) {
 420              $displaytypes = $this->displaytype;
 421          } else {
 422              // Implode the grade display types array as moodle_url function doesn't accept arrays.
 423              $displaytypes = implode(',', $this->displaytype);
 424          }
 425  
 426          if (!empty($this->updatedgradesonly)) {
 427              $updatedgradesonly = $this->updatedgradesonly;
 428          } else {
 429              $updatedgradesonly = 0;
 430          }
 431          $params = array('id'                => $this->course->id,
 432                          'groupid'           => $this->groupid,
 433                          'itemids'           => $itemidsparam,
 434                          'export_letters'    => $this->export_letters,
 435                          'export_feedback'   => $this->export_feedback,
 436                          'updatedgradesonly' => $updatedgradesonly,
 437                          'decimalpoints'     => $this->decimalpoints,
 438                          'export_onlyactive' => $this->onlyactive,
 439                          'usercustomfields'  => $this->usercustomfields,
 440                          'displaytype'       => $displaytypes,
 441                          'key'               => $this->userkey);
 442  
 443          return $params;
 444      }
 445  
 446      /**
 447       * Either prints a "Export" box, which will redirect the user to the download page,
 448       * or prints the URL for the published data.
 449       *
 450       * @deprecated since 2.8 MDL-46548. Call get_export_url and set the
 451       *             action of the grade_export_form instead.
 452       * @return void
 453       */
 454      public function print_continue() {
 455          global $CFG, $OUTPUT;
 456  
 457          debugging('function grade_export::print_continue is deprecated.', DEBUG_DEVELOPER);
 458          $params = $this->get_export_params();
 459  
 460          echo $OUTPUT->heading(get_string('export', 'grades'));
 461  
 462          echo $OUTPUT->container_start('gradeexportlink');
 463  
 464          if (!$this->userkey) {
 465              // This button should trigger a download prompt.
 466              $url = new moodle_url('/grade/export/'.$this->plugin.'/export.php', $params);
 467              echo $OUTPUT->single_button($url, get_string('download', 'admin'));
 468  
 469          } else {
 470              $paramstr = '';
 471              $sep = '?';
 472              foreach($params as $name=>$value) {
 473                  $paramstr .= $sep.$name.'='.$value;
 474                  $sep = '&';
 475              }
 476  
 477              $link = $CFG->wwwroot.'/grade/export/'.$this->plugin.'/dump.php'.$paramstr.'&key='.$this->userkey;
 478  
 479              echo get_string('download', 'admin').': ' . html_writer::link($link, $link);
 480          }
 481          echo $OUTPUT->container_end();
 482  
 483          return;
 484      }
 485  
 486      /**
 487       * Generate the export url.
 488       *
 489       * Get submitted form data and create the url to be used on the grade publish feature.
 490       *
 491       * @return moodle_url the url of grade publishing export.
 492       */
 493      public function get_export_url() {
 494          return new moodle_url('/grade/export/'.$this->plugin.'/dump.php', $this->get_export_params());
 495      }
 496  
 497      /**
 498       * Convert the grade display types parameter into the required array to grade exporting class.
 499       *
 500       * In order to export, the array key must be the display type name and the value must be the grade display type
 501       * constant.
 502       *
 503       * Note: Added support for combined display types constants like the (GRADE_DISPLAY_TYPE_PERCENTAGE_REAL) as
 504       *       the $CFG->grade_export_displaytype config is still used on 2.7 in case of missing displaytype url param.
 505       *       In these cases, the file will be exported with a column for each display type.
 506       *
 507       * @param string $displaytypes can be a single or multiple display type constants comma separated.
 508       * @return array $types
 509       */
 510      public static function convert_flat_displaytypes_to_array($displaytypes) {
 511          $types = array();
 512  
 513          // We have a single grade display type constant.
 514          if (is_int($displaytypes)) {
 515              $displaytype = clean_param($displaytypes, PARAM_INT);
 516  
 517              // Let's set a default value, will be replaced below by the grade display type constant.
 518              $display[$displaytype] = 1;
 519          } else {
 520              // Multiple grade display types constants.
 521              $display = array_flip(explode(',', $displaytypes));
 522          }
 523  
 524          // Now, create the array in the required format by grade exporting class.
 525          foreach ($display as $type => $value) {
 526              $type = clean_param($type, PARAM_INT);
 527              if ($type == GRADE_DISPLAY_TYPE_LETTER) {
 528                  $types['letter'] = GRADE_DISPLAY_TYPE_LETTER;
 529              } else if ($type == GRADE_DISPLAY_TYPE_PERCENTAGE) {
 530                  $types['percentage'] = GRADE_DISPLAY_TYPE_PERCENTAGE;
 531              } else if ($type == GRADE_DISPLAY_TYPE_REAL) {
 532                  $types['real'] = GRADE_DISPLAY_TYPE_REAL;
 533              } else if ($type == GRADE_DISPLAY_TYPE_REAL_PERCENTAGE) {
 534                  $types['real'] = GRADE_DISPLAY_TYPE_REAL;
 535                  $types['percentage'] = GRADE_DISPLAY_TYPE_PERCENTAGE;
 536              } else if ($type == GRADE_DISPLAY_TYPE_REAL_LETTER) {
 537                  $types['real'] = GRADE_DISPLAY_TYPE_REAL;
 538                  $types['letter'] = GRADE_DISPLAY_TYPE_LETTER;
 539              } else if ($type == GRADE_DISPLAY_TYPE_LETTER_REAL) {
 540                  $types['letter'] = GRADE_DISPLAY_TYPE_LETTER;
 541                  $types['real'] = GRADE_DISPLAY_TYPE_REAL;
 542              } else if ($type == GRADE_DISPLAY_TYPE_LETTER_PERCENTAGE) {
 543                  $types['letter'] = GRADE_DISPLAY_TYPE_LETTER;
 544                  $types['percentage'] = GRADE_DISPLAY_TYPE_PERCENTAGE;
 545              } else if ($type == GRADE_DISPLAY_TYPE_PERCENTAGE_LETTER) {
 546                  $types['percentage'] = GRADE_DISPLAY_TYPE_PERCENTAGE;
 547                  $types['letter'] = GRADE_DISPLAY_TYPE_LETTER;
 548              } else if ($type == GRADE_DISPLAY_TYPE_PERCENTAGE_REAL) {
 549                  $types['percentage'] = GRADE_DISPLAY_TYPE_PERCENTAGE;
 550                  $types['real'] = GRADE_DISPLAY_TYPE_REAL;
 551              }
 552          }
 553          return $types;
 554      }
 555  
 556      /**
 557       * Convert the item ids parameter into the required array to grade exporting class.
 558       *
 559       * In order to export, the array key must be the grade item id and all values must be one.
 560       *
 561       * @param string $itemids can be a single item id or many item ids comma separated.
 562       * @return array $items correctly formatted array.
 563       */
 564      public static function convert_flat_itemids_to_array($itemids) {
 565          $items = array();
 566  
 567          // We just have one single item id.
 568          if (is_int($itemids)) {
 569              $itemid = clean_param($itemids, PARAM_INT);
 570              $items[$itemid] = 1;
 571          } else {
 572              // Few grade items.
 573              $items = array_flip(explode(',', $itemids));
 574              foreach ($items as $itemid => $value) {
 575                  $itemid = clean_param($itemid, PARAM_INT);
 576                  $items[$itemid] = 1;
 577              }
 578          }
 579          return $items;
 580      }
 581  
 582      /**
 583       * Create the html code of the grade publishing feature.
 584       *
 585       * @return string $output html code of the grade publishing.
 586       */
 587      public function get_grade_publishing_url() {
 588          $url = $this->get_export_url();
 589          $output =  html_writer::start_div();
 590          $output .= html_writer::tag('p', get_string('gradepublishinglink', 'grades', html_writer::link($url, $url)));
 591          $output .=  html_writer::end_div();
 592          return $output;
 593      }
 594  
 595      /**
 596       * Create a stdClass object from URL parameters to be used by grade_export class.
 597       *
 598       * @param int $id course id.
 599       * @param string $itemids grade items comma separated.
 600       * @param bool $exportfeedback export feedback option.
 601       * @param bool $onlyactive only enrolled active students.
 602       * @param string $displaytype grade display type constants comma separated.
 603       * @param int $decimalpoints grade decimal points.
 604       * @param null $updatedgradesonly recently updated grades only (Used by XML exporting only).
 605       * @param null $separator separator character: tab, comma, colon and semicolon (Used by TXT exporting only).
 606       *
 607       * @return stdClass $formdata
 608       */
 609      public static function export_bulk_export_data($id, $itemids, $exportfeedback, $onlyactive, $displaytype,
 610                                                     $decimalpoints, $updatedgradesonly = null, $separator = null) {
 611  
 612          $formdata = new \stdClass();
 613          $formdata->id = $id;
 614          $formdata->itemids = self::convert_flat_itemids_to_array($itemids);
 615          $formdata->exportfeedback = $exportfeedback;
 616          $formdata->export_onlyactive = $onlyactive;
 617          $formdata->display = self::convert_flat_displaytypes_to_array($displaytype);
 618          $formdata->decimals = $decimalpoints;
 619  
 620          if (!empty($updatedgradesonly)) {
 621              $formdata->updatedgradesonly = $updatedgradesonly;
 622          }
 623  
 624          if (!empty($separator)) {
 625              $formdata->separator = $separator;
 626          }
 627  
 628          return $formdata;
 629      }
 630  }
 631  
 632  /**
 633   * This class is used to update the exported field in grade_grades.
 634   * It does internal buffering to speedup the db operations.
 635   */
 636  class grade_export_update_buffer {
 637      public $update_list;
 638      public $export_time;
 639  
 640      /**
 641       * Constructor - creates the buffer and initialises the time stamp
 642       */
 643      public function __construct() {
 644          $this->update_list = array();
 645          $this->export_time = time();
 646      }
 647  
 648      /**
 649       * Old syntax of class constructor. Deprecated in PHP7.
 650       *
 651       * @deprecated since Moodle 3.1
 652       */
 653      public function grade_export_update_buffer() {
 654          debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
 655          self::__construct();
 656      }
 657  
 658      public function flush($buffersize) {
 659          global $CFG, $DB;
 660  
 661          if (count($this->update_list) > $buffersize) {
 662              list($usql, $params) = $DB->get_in_or_equal($this->update_list);
 663              $params = array_merge(array($this->export_time), $params);
 664  
 665              $sql = "UPDATE {grade_grades} SET exported = ? WHERE id $usql";
 666              $DB->execute($sql, $params);
 667              $this->update_list = array();
 668          }
 669      }
 670  
 671      /**
 672       * Track grade export status
 673       * @param object $grade_grade
 674       * @return string $status (unknow, new, regrade, nochange)
 675       */
 676      public function track($grade_grade) {
 677  
 678          if (empty($grade_grade->exported) or empty($grade_grade->timemodified)) {
 679              if (is_null($grade_grade->finalgrade)) {
 680                  // grade does not exist yet
 681                  $status = 'unknown';
 682              } else {
 683                  $status = 'new';
 684                  $this->update_list[] = $grade_grade->id;
 685              }
 686  
 687          } else if ($grade_grade->exported < $grade_grade->timemodified) {
 688              $status = 'regrade';
 689              $this->update_list[] = $grade_grade->id;
 690  
 691          } else if ($grade_grade->exported >= $grade_grade->timemodified) {
 692              $status = 'nochange';
 693  
 694          } else {
 695              // something is wrong?
 696              $status = 'unknown';
 697          }
 698  
 699          $this->flush(100);
 700  
 701          return $status;
 702      }
 703  
 704      /**
 705       * Flush and close the buffer.
 706       */
 707      public function close() {
 708          $this->flush(0);
 709      }
 710  }
 711  
 712  /**
 713   * Verify that there is a valid set of grades to export.
 714   * @param $courseid int The course being exported
 715   */
 716  function export_verify_grades($courseid) {
 717      if (grade_needs_regrade_final_grades($courseid)) {
 718          throw new moodle_exception('gradesneedregrading', 'grades');
 719      }
 720  }