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gradelib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library of functions for gradebook - both public and internal
*
* @package core
* @subpackage grade
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/** Include essential files */
require_once($CFG->libdir . '/grade/constants.php');
require_once($CFG->libdir . '/grade/grade_category.php');
require_once($CFG->libdir . '/grade/grade_item.php');
require_once($CFG->libdir . '/grade/grade_grade.php');
require_once($CFG->libdir . '/grade/grade_scale.php');
require_once($CFG->libdir . '/grade/grade_outcome.php');
/////////////////////////////////////////////////////////////////////
///// Start of public API for communication with modules/blocks /////
/////////////////////////////////////////////////////////////////////
/**
* Submit new or update grade; update/create grade_item definition. Grade must have userid specified,
* rawgrade and feedback with format are optional. rawgrade NULL means 'Not graded', missing property
* or key means do not change existing.
*
* Only following grade item properties can be changed 'itemname', 'idnumber', 'gradetype', 'grademax',
* 'grademin', 'scaleid', 'multfactor', 'plusfactor', 'deleted' and 'hidden'. 'reset' means delete all current grades including locked ones.
*
* Manual, course or category items can not be updated by this function.
* @access public
* @global object
* @global object
* @global object
* @param string $source source of the grade such as 'mod/assignment'
* @param int $courseid id of course
* @param string $itemtype type of grade item - mod, block
* @param string $itemmodule more specific then $itemtype - assignment, forum, etc.; maybe NULL for some item types
* @param int $iteminstance instance it of graded subject
* @param int $itemnumber most probably 0, modules can use other numbers when having more than one grades for each user
* @param mixed $grades grade (object, array) or several grades (arrays of arrays or objects), NULL if updating grade_item definition only
* @param mixed $itemdetails object or array describing the grading item, NULL if no change
*/
function grade_update($source, $courseid, $itemtype, $itemmodule, $iteminstance, $itemnumber, $grades=NULL, $itemdetails=NULL) {
global $USER, $CFG, $DB;
// only following grade_item properties can be changed in this function
$allowed = array('itemname', 'idnumber', 'gradetype', 'grademax', 'grademin', 'scaleid', 'multfactor', 'plusfactor', 'deleted', 'hidden');
// list of 10,5 numeric fields
$floats = array('grademin', 'grademax', 'multfactor', 'plusfactor');
// grade item identification
$params = compact('courseid', 'itemtype', 'itemmodule', 'iteminstance', 'itemnumber');
if (is_null($courseid) or is_null($itemtype)) {
debugging('Missing courseid or itemtype');
return GRADE_UPDATE_FAILED;
}
if (!$grade_items = grade_item::fetch_all($params)) {
// create a new one
$grade_item = false;
} else if (count($grade_items) == 1){
$grade_item = reset($grade_items);
unset($grade_items); //release memory
} else {
debugging('Found more than one grade item');
return GRADE_UPDATE_MULTIPLE;
}
if (!empty($itemdetails['deleted'])) {
if ($grade_item) {
if ($grade_item->delete($source)) {
return GRADE_UPDATE_OK;
} else {
return GRADE_UPDATE_FAILED;
}
}
return GRADE_UPDATE_OK;
}
/// Create or update the grade_item if needed
if (!$grade_item) {
if ($itemdetails) {
$itemdetails = (array)$itemdetails;
// grademin and grademax ignored when scale specified
if (array_key_exists('scaleid', $itemdetails)) {
if ($itemdetails['scaleid']) {
unset($itemdetails['grademin']);
unset($itemdetails['grademax']);
}
}
foreach ($itemdetails as $k=>$v) {
if (!in_array($k, $allowed)) {
// ignore it
continue;
}
if ($k == 'gradetype' and $v == GRADE_TYPE_NONE) {
// no grade item needed!
return GRADE_UPDATE_OK;
}
$params[$k] = $v;
}
}
$grade_item = new grade_item($params);
$grade_item->insert();
} else {
if ($grade_item->is_locked()) {
// no notice() here, test returned value instead!
return GRADE_UPDATE_ITEM_LOCKED;
}
if ($itemdetails) {
$itemdetails = (array)$itemdetails;
$update = false;
foreach ($itemdetails as $k=>$v) {
if (!in_array($k, $allowed)) {
// ignore it
continue;
}
if (in_array($k, $floats)) {
if (grade_floats_different($grade_item->{$k}, $v)) {
$grade_item->{$k} = $v;
$update = true;
}
} else {
if ($grade_item->{$k} != $v) {
$grade_item->{$k} = $v;
$update = true;
}
}
}
if ($update) {
$grade_item->update();
}
}
}
/// reset grades if requested
if (!empty($itemdetails['reset'])) {
$grade_item->delete_all_grades('reset');
return GRADE_UPDATE_OK;
}
/// Some extra checks
// do we use grading?
if ($grade_item->gradetype == GRADE_TYPE_NONE) {
return GRADE_UPDATE_OK;
}
// no grade submitted
if (empty($grades)) {
return GRADE_UPDATE_OK;
}
/// Finally start processing of grades
if (is_object($grades)) {
$grades = array($grades->userid=>$grades);
} else {
if (array_key_exists('userid', $grades)) {
$grades = array($grades['userid']=>$grades);
}
}
/// normalize and verify grade array
foreach($grades as $k=>$g) {
if (!is_array($g)) {
$g = (array)$g;
$grades[$k] = $g;
}
if (empty($g['userid']) or $k != $g['userid']) {
debugging('Incorrect grade array index, must be user id! Grade ignored.');
unset($grades[$k]);
}
}
if (empty($grades)) {
return GRADE_UPDATE_FAILED;
}
$count = count($grades);
if ($count > 0 and $count < 200) {
list($uids, $params) = $DB->get_in_or_equal(array_keys($grades), SQL_PARAMS_NAMED, $start='uid0');
$params['gid'] = $grade_item->id;
$sql = "SELECT * FROM {grade_grades} WHERE itemid = :gid AND userid $uids";
} else {
$sql = "SELECT * FROM {grade_grades} WHERE itemid = :gid";
$params = array('gid'=>$grade_item->id);
}
$rs = $DB->get_recordset_sql($sql, $params);
$failed = false;
while (count($grades) > 0) {
$grade_grade = null;
$grade = null;
foreach ($rs as $gd) {
$userid = $gd->userid;
if (!isset($grades[$userid])) {
// this grade not requested, continue
continue;
}
// existing grade requested
$grade = $grades[$userid];
$grade_grade = new grade_grade($gd, false);
unset($grades[$userid]);
break;
}
if (is_null($grade_grade)) {
if (count($grades) == 0) {
// no more grades to process
break;
}
$grade = reset($grades);
$userid = $grade['userid'];
$grade_grade = new grade_grade(array('itemid'=>$grade_item->id, 'userid'=>$userid), false);
$grade_grade->load_optional_fields(); // add feedback and info too
unset($grades[$userid]);
}
$rawgrade = false;
$feedback = false;
$feedbackformat = FORMAT_MOODLE;
$usermodified = $USER->id;
$datesubmitted = null;
$dategraded = null;
if (array_key_exists('rawgrade', $grade)) {
$rawgrade = $grade['rawgrade'];
}
if (array_key_exists('feedback', $grade)) {
$feedback = $grade['feedback'];
}
if (array_key_exists('feedbackformat', $grade)) {
$feedbackformat = $grade['feedbackformat'];
}
if (array_key_exists('usermodified', $grade)) {
$usermodified = $grade['usermodified'];
}
if (array_key_exists('datesubmitted', $grade)) {
$datesubmitted = $grade['datesubmitted'];
}
if (array_key_exists('dategraded', $grade)) {
$dategraded = $grade['dategraded'];
}
// update or insert the grade
if (!$grade_item->update_raw_grade($userid, $rawgrade, $source, $feedback, $feedbackformat, $usermodified, $dategraded, $datesubmitted, $grade_grade)) {
$failed = true;
}
}
if ($rs) {
$rs->close();
}
if (!$failed) {
return GRADE_UPDATE_OK;
} else {
return GRADE_UPDATE_FAILED;
}
}
/**
* Updates outcomes of user
* Manual outcomes can not be updated.
*
* @access public
* @param string $source source of the grade such as 'mod/assignment'
* @param int $courseid id of course
* @param string $itemtype 'mod', 'block'
* @param string $itemmodule 'forum, 'quiz', etc.
* @param int $iteminstance id of the item module
* @param int $userid ID of the graded user
* @param array $data array itemnumber=>outcomegrade
* @return boolean returns true if grade items were found and updated successfully
*/
function grade_update_outcomes($source, $courseid, $itemtype, $itemmodule, $iteminstance, $userid, $data) {
if ($items = grade_item::fetch_all(array('itemtype'=>$itemtype, 'itemmodule'=>$itemmodule, 'iteminstance'=>$iteminstance, 'courseid'=>$courseid))) {
$result = true;
foreach ($items as $item) {
if (!array_key_exists($item->itemnumber, $data)) {
continue;
}
$grade = $data[$item->itemnumber] < 1 ? null : $data[$item->itemnumber];
$result = ($item->update_final_grade($userid, $grade, $source) && $result);
}
return $result;
}
return false; //grade items not found
}
/**
* Returns grading information for given activity - optionally with users grades
* Manual, course or category items can not be queried.
*
* @access public
* @global object
* @param int $courseid id of course
* @param string $itemtype 'mod', 'block'
* @param string $itemmodule 'forum, 'quiz', etc.
* @param int $iteminstance id of the item module
* @param array|int $userid_or_ids optional id of the graded user or array of ids; if userid not used, returns only information about grade_item
* @return array Array of grade information objects (scaleid, name, grade and locked status, etc.) indexed with itemnumbers
*/
function grade_get_grades($courseid, $itemtype, $itemmodule, $iteminstance, $userid_or_ids=null) {
global $CFG;
$return = new stdClass();
$return->items = array();
$return->outcomes = array();
$course_item = grade_item::fetch_course_item($courseid);
$needsupdate = array();
if ($course_item->needsupdate) {
$result = grade_regrade_final_grades($courseid);
if ($result !== true) {
$needsupdate = array_keys($result);
}
}
if ($grade_items = grade_item::fetch_all(array('itemtype'=>$itemtype, 'itemmodule'=>$itemmodule, 'iteminstance'=>$iteminstance, 'courseid'=>$courseid))) {
foreach ($grade_items as $grade_item) {
$decimalpoints = null;
if (empty($grade_item->outcomeid)) {
// prepare information about grade item
$item = new stdClass();
$item->itemnumber = $grade_item->itemnumber;
$item->scaleid = $grade_item->scaleid;
$item->name = $grade_item->get_name();
$item->grademin = $grade_item->grademin;
$item->grademax = $grade_item->grademax;
$item->gradepass = $grade_item->gradepass;
$item->locked = $grade_item->is_locked();
$item->hidden = $grade_item->is_hidden();
$item->grades = array();
switch ($grade_item->gradetype) {
case GRADE_TYPE_NONE:
continue;
case GRADE_TYPE_VALUE:
$item->scaleid = 0;
break;
case GRADE_TYPE_TEXT:
$item->scaleid = 0;
$item->grademin = 0;
$item->grademax = 0;
$item->gradepass = 0;
break;
}
if (empty($userid_or_ids)) {
$userids = array();
} else if (is_array($userid_or_ids)) {
$userids = $userid_or_ids;
} else {
$userids = array($userid_or_ids);
}
if ($userids) {
$grade_grades = grade_grade::fetch_users_grades($grade_item, $userids, true);
foreach ($userids as $userid) {
$grade_grades[$userid]->grade_item =& $grade_item;
$grade = new stdClass();
$grade->grade = $grade_grades[$userid]->finalgrade;
$grade->locked = $grade_grades[$userid]->is_locked();
$grade->hidden = $grade_grades[$userid]->is_hidden();
$grade->overridden = $grade_grades[$userid]->overridden;
$grade->feedback = $grade_grades[$userid]->feedback;
$grade->feedbackformat = $grade_grades[$userid]->feedbackformat;
$grade->usermodified = $grade_grades[$userid]->usermodified;
$grade->datesubmitted = $grade_grades[$userid]->get_datesubmitted();
$grade->dategraded = $grade_grades[$userid]->get_dategraded();
// create text representation of grade
if ($grade_item->gradetype == GRADE_TYPE_TEXT or $grade_item->gradetype == GRADE_TYPE_NONE) {
$grade->grade = null;
$grade->str_grade = '-';
$grade->str_long_grade = $grade->str_grade;
} else if (in_array($grade_item->id, $needsupdate)) {
$grade->grade = false;
$grade->str_grade = get_string('error');
$grade->str_long_grade = $grade->str_grade;
} else if (is_null($grade->grade)) {
$grade->str_grade = '-';
$grade->str_long_grade = $grade->str_grade;
} else {
$grade->str_grade = grade_format_gradevalue($grade->grade, $grade_item);
if ($grade_item->gradetype == GRADE_TYPE_SCALE or $grade_item->get_displaytype() != GRADE_DISPLAY_TYPE_REAL) {
$grade->str_long_grade = $grade->str_grade;
} else {
$a = new stdClass();
$a->grade = $grade->str_grade;
$a->max = grade_format_gradevalue($grade_item->grademax, $grade_item);
$grade->str_long_grade = get_string('gradelong', 'grades', $a);
}
}
// create html representation of feedback
if (is_null($grade->feedback)) {
$grade->str_feedback = '';
} else {
$grade->str_feedback = format_text($grade->feedback, $grade->feedbackformat);
}
$item->grades[$userid] = $grade;
}
}
$return->items[$grade_item->itemnumber] = $item;
} else {
if (!$grade_outcome = grade_outcome::fetch(array('id'=>$grade_item->outcomeid))) {
debugging('Incorect outcomeid found');
continue;
}
// outcome info
$outcome = new stdClass();
$outcome->itemnumber = $grade_item->itemnumber;
$outcome->scaleid = $grade_outcome->scaleid;
$outcome->name = $grade_outcome->get_name();
$outcome->locked = $grade_item->is_locked();
$outcome->hidden = $grade_item->is_hidden();
if (empty($userid_or_ids)) {
$userids = array();
} else if (is_array($userid_or_ids)) {
$userids = $userid_or_ids;
} else {
$userids = array($userid_or_ids);
}
if ($userids) {
$grade_grades = grade_grade::fetch_users_grades($grade_item, $userids, true);
foreach ($userids as $userid) {
$grade_grades[$userid]->grade_item =& $grade_item;
$grade = new stdClass();
$grade->grade = $grade_grades[$userid]->finalgrade;
$grade->locked = $grade_grades[$userid]->is_locked();
$grade->hidden = $grade_grades[$userid]->is_hidden();
$grade->feedback = $grade_grades[$userid]->feedback;
$grade->feedbackformat = $grade_grades[$userid]->feedbackformat;
$grade->usermodified = $grade_grades[$userid]->usermodified;
// create text representation of grade
if (in_array($grade_item->id, $needsupdate)) {
$grade->grade = false;
$grade->str_grade = get_string('error');
} else if (is_null($grade->grade)) {
$grade->grade = 0;
$grade->str_grade = get_string('nooutcome', 'grades');
} else {
$grade->grade = (int)$grade->grade;
$scale = $grade_item->load_scale();
$grade->str_grade = format_string($scale->scale_items[(int)$grade->grade-1]);
}
// create html representation of feedback
if (is_null($grade->feedback)) {
$grade->str_feedback = '';
} else {
$grade->str_feedback = format_text($grade->feedback, $grade->feedbackformat);
}
$outcome->grades[$userid] = $grade;
}
}
if (isset($return->outcomes[$grade_item->itemnumber])) {
// itemnumber duplicates - lets fix them!
$newnumber = $grade_item->itemnumber + 1;
while(grade_item::fetch(array('itemtype'=>$itemtype, 'itemmodule'=>$itemmodule, 'iteminstance'=>$iteminstance, 'courseid'=>$courseid, 'itemnumber'=>$newnumber))) {
$newnumber++;
}
$outcome->itemnumber = $newnumber;
$grade_item->itemnumber = $newnumber;
$grade_item->update('system');
}
$return->outcomes[$grade_item->itemnumber] = $outcome;
}
}
}
// sort results using itemnumbers
ksort($return->items, SORT_NUMERIC);
ksort($return->outcomes, SORT_NUMERIC);
return $return;
}
///////////////////////////////////////////////////////////////////
///// End of public API for communication with modules/blocks /////
///////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////
///// Internal API: used by gradebook plugins and Moodle core /////
///////////////////////////////////////////////////////////////////
/**
* Returns course gradebook setting
*
* @global object
* @param int $courseid
* @param string $name of setting, maybe null if reset only
* @param string $default
* @param bool $resetcache force reset of internal static cache
* @return string value, NULL if no setting
*/
function grade_get_setting($courseid, $name, $default=null, $resetcache=false) {
global $DB;
static $cache = array();
if ($resetcache or !array_key_exists($courseid, $cache)) {
$cache[$courseid] = array();
} else if (is_null($name)) {
return null;
} else if (array_key_exists($name, $cache[$courseid])) {
return $cache[$courseid][$name];
}
if (!$data = $DB->get_record('grade_settings', array('courseid'=>$courseid, 'name'=>$name))) {
$result = null;
} else {
$result = $data->value;
}
if (is_null($result)) {
$result = $default;
}
$cache[$courseid][$name] = $result;
return $result;
}
/**
* Returns all course gradebook settings as object properties
*
* @global object
* @param int $courseid
* @return object
*/
function grade_get_settings($courseid) {
global $DB;
$settings = new stdClass();
$settings->id = $courseid;
if ($records = $DB->get_records('grade_settings', array('courseid'=>$courseid))) {
foreach ($records as $record) {
$settings->{$record->name} = $record->value;
}
}
return $settings;
}
/**
* Add/update course gradebook setting
*
* @global object
* @param int $courseid
* @param string $name of setting
* @param string value, NULL means no setting==remove
* @return void
*/
function grade_set_setting($courseid, $name, $value) {
global $DB;
if (is_null($value)) {
$DB->delete_records('grade_settings', array('courseid'=>$courseid, 'name'=>$name));
} else if (!$existing = $DB->get_record('grade_settings', array('courseid'=>$courseid, 'name'=>$name))) {
$data = new stdClass();
$data->courseid = $courseid;
$data->name = $name;
$data->value = $value;
$DB->insert_record('grade_settings', $data);
} else {
$data = new stdClass();
$data->id = $existing->id;
$data->value = $value;
$DB->update_record('grade_settings', $data);
}
grade_get_setting($courseid, null, null, true); // reset the cache
}
/**
* Returns string representation of grade value
*
* @param float $value grade value
* @param object $grade_item - by reference to prevent scale reloading
* @param bool $localized use localised decimal separator
* @param int $displaytype type of display - GRADE_DISPLAY_TYPE_REAL, GRADE_DISPLAY_TYPE_PERCENTAGE, GRADE_DISPLAY_TYPE_LETTER
* @param int $decimals number of decimal places when displaying float values
* @return string
*/
function grade_format_gradevalue($value, &$grade_item, $localized=true, $displaytype=null, $decimals=null) {
if ($grade_item->gradetype == GRADE_TYPE_NONE or $grade_item->gradetype == GRADE_TYPE_TEXT) {
return '';
}
// no grade yet?
if (is_null($value)) {
return '-';
}
if ($grade_item->gradetype != GRADE_TYPE_VALUE and $grade_item->gradetype != GRADE_TYPE_SCALE) {
//unknown type??
return '';
}
if (is_null($displaytype)) {
$displaytype = $grade_item->get_displaytype();
}
if (is_null($decimals)) {
$decimals = $grade_item->get_decimals();
}
switch ($displaytype) {
case GRADE_DISPLAY_TYPE_REAL:
return grade_format_gradevalue_real($value, $grade_item, $decimals, $localized);
case GRADE_DISPLAY_TYPE_PERCENTAGE:
return grade_format_gradevalue_percentage($value, $grade_item, $decimals, $localized);
case GRADE_DISPLAY_TYPE_LETTER:
return grade_format_gradevalue_letter($value, $grade_item);
case GRADE_DISPLAY_TYPE_REAL_PERCENTAGE:
return grade_format_gradevalue_real($value, $grade_item, $decimals, $localized) . ' (' .
grade_format_gradevalue_percentage($value, $grade_item, $decimals, $localized) . ')';
case GRADE_DISPLAY_TYPE_REAL_LETTER:
return grade_format_gradevalue_real($value, $grade_item, $decimals, $localized) . ' (' .
grade_format_gradevalue_letter($value, $grade_item) . ')';
case GRADE_DISPLAY_TYPE_PERCENTAGE_REAL:
return grade_format_gradevalue_percentage($value, $grade_item, $decimals, $localized) . ' (' .
grade_format_gradevalue_real($value, $grade_item, $decimals, $localized) . ')';
case GRADE_DISPLAY_TYPE_LETTER_REAL:
return grade_format_gradevalue_letter($value, $grade_item) . ' (' .
grade_format_gradevalue_real($value, $grade_item, $decimals, $localized) . ')';
case GRADE_DISPLAY_TYPE_LETTER_PERCENTAGE:
return grade_format_gradevalue_letter($value, $grade_item) . ' (' .
grade_format_gradevalue_percentage($value, $grade_item, $decimals, $localized) . ')';
case GRADE_DISPLAY_TYPE_PERCENTAGE_LETTER:
return grade_format_gradevalue_percentage($value, $grade_item, $decimals, $localized) . ' (' .
grade_format_gradevalue_letter($value, $grade_item) . ')';
default:
return '';
}
}
/**
* @todo Document this function
*/
function grade_format_gradevalue_real($value, $grade_item, $decimals, $localized) {
if ($grade_item->gradetype == GRADE_TYPE_SCALE) {
if (!$scale = $grade_item->load_scale()) {
return get_string('error');
}
$value = $grade_item->bounded_grade($value);
return format_string($scale->scale_items[$value-1]);
} else {
return format_float($value, $decimals, $localized);
}
}
/**
* @todo Document this function
*/
function grade_format_gradevalue_percentage($value, $grade_item, $decimals, $localized) {
$min = $grade_item->grademin;
$max = $grade_item->grademax;
if ($min == $max) {
return '';
}
$value = $grade_item->bounded_grade($value);
$percentage = (($value-$min)*100)/($max-$min);
return format_float($percentage, $decimals, $localized).' %';
}
/**
* @todo Document this function
*/
function grade_format_gradevalue_letter($value, $grade_item) {
$context = get_context_instance(CONTEXT_COURSE, $grade_item->courseid);
if (!$letters = grade_get_letters($context)) {
return ''; // no letters??
}
if (is_null($value)) {
return '-';
}
$value = grade_grade::standardise_score($value, $grade_item->grademin, $grade_item->grademax, 0, 100);
$value = bounded_number(0, $value, 100); // just in case
foreach ($letters as $boundary => $letter) {
if ($value >= $boundary) {
return format_string($letter);
}
}
return '-'; // no match? maybe '' would be more correct
}
/**
* Returns grade options for gradebook category menu
*
* @param int $courseid
* @param bool $includenew include option for new category (-1)
* @return array of grade categories in course
*/
function grade_get_categories_menu($courseid, $includenew=false) {
$result = array();
if (!$categories = grade_category::fetch_all(array('courseid'=>$courseid))) {
//make sure course category exists
if (!grade_category::fetch_course_category($courseid)) {
debugging('Can not create course grade category!');
return $result;
}
$categories = grade_category::fetch_all(array('courseid'=>$courseid));
}
foreach ($categories as $key=>$category) {
if ($category->is_course_category()) {
$result[$category->id] = get_string('uncategorised', 'grades');
unset($categories[$key]);
}
}
if ($includenew) {
$result[-1] = get_string('newcategory', 'grades');
}
$cats = array();
foreach ($categories as $category) {
$cats[$category->id] = $category->get_name();
}
textlib_get_instance()->asort($cats);
return ($result+$cats);
}
/**
* Returns grade letters array used in context
*
* @param object $context object or null for defaults
* @return array of grade_boundary=>letter_string
*/
function grade_get_letters($context=null) {
global $DB;
if (empty($context)) {
//default grading letters
return array('93'=>'A', '90'=>'A-', '87'=>'B+', '83'=>'B', '80'=>'B-', '77'=>'C+', '73'=>'C', '70'=>'C-', '67'=>'D+', '60'=>'D', '0'=>'F');
}
static $cache = array();
if (array_key_exists($context->id, $cache)) {
return $cache[$context->id];
}
if (count($cache) > 100) {
$cache = array(); // cache size limit
}
$letters = array();
$contexts = get_parent_contexts($context);
array_unshift($contexts, $context->id);
foreach ($contexts as $ctxid) {
if ($records = $DB->get_records('grade_letters', array('contextid'=>$ctxid), 'lowerboundary DESC')) {
foreach ($records as $record) {
$letters[$record->lowerboundary] = $record->letter;
}
}
if (!empty($letters)) {
$cache[$context->id] = $letters;
return $letters;
}
}
$letters = grade_get_letters(null);
$cache[$context->id] = $letters;
return $letters;
}
/**
* Verify new value of idnumber - checks for uniqueness of new idnumbers, old are kept intact
*
* @global object
* @param string idnumber string (with magic quotes)
* @param int $courseid id numbers are course unique only
* @param object $grade_item is item idnumber
* @param object $cm used for course module idnumbers and items attached to modules
* @return boolean true means idnumber ok
*/
function grade_verify_idnumber($idnumber, $courseid, $grade_item=null, $cm=null) {
global $DB;
if ($idnumber == '') {
//we allow empty idnumbers
return true;
}
// keep existing even when not unique
if ($cm and $cm->idnumber == $idnumber) {
if ($grade_item and $grade_item->itemnumber != 0) {
// grade item with itemnumber > 0 can't have the same idnumber as the main
// itemnumber 0 which is synced with course_modules
return false;
}
return true;
} else if ($grade_item and $grade_item->idnumber == $idnumber) {
return true;
}
if ($DB->record_exists('course_modules', array('course'=>$courseid, 'idnumber'=>$idnumber))) {
return false;
}
if ($DB->record_exists('grade_items', array('courseid'=>$courseid, 'idnumber'=>$idnumber))) {
return false;
}
return true;
}
/**
* Force final grade recalculation in all course items
*
* @global object
* @param int $courseid
*/
function grade_force_full_regrading($courseid) {
global $DB;
$DB->set_field('grade_items', 'needsupdate', 1, array('courseid'=>$courseid));
}
/**
* Forces regrading of all site grades - usualy when chanign site setings
* @global object
* @global object
*/
function grade_force_site_regrading() {
global $CFG, $DB;
$DB->set_field('grade_items', 'needsupdate', 1);
}
/**
* Updates all final grades in course.
*
* @param int $courseid
* @param int $userid if specified, try to do a quick regrading of grades of this user only
* @param object $updated_item the item in which
* @return boolean true if ok, array of errors if problems found (item id is used as key)
*/
function grade_regrade_final_grades($courseid, $userid=null, $updated_item=null) {
$course_item = grade_item::fetch_course_item($courseid);
if ($userid) {
// one raw grade updated for one user
if (empty($updated_item)) {
print_error("cannotbenull", 'debug', '', "updated_item");
}
if ($course_item->needsupdate) {
$updated_item->force_regrading();
return array($course_item->id =>'Can not do fast regrading after updating of raw grades');
}
} else {
if (!$course_item->needsupdate) {
// nothing to do :-)
return true;
}
}
$grade_items = grade_item::fetch_all(array('courseid'=>$courseid));
$depends_on = array();
// first mark all category and calculated items as needing regrading
// this is slower, but 100% accurate
foreach ($grade_items as $gid=>$gitem) {
if (!empty($updated_item) and $updated_item->id == $gid) {
$grade_items[$gid]->needsupdate = 1;
} else if ($gitem->is_course_item() or $gitem->is_category_item() or $gitem->is_calculated()) {
$grade_items[$gid]->needsupdate = 1;
}
// construct depends_on lookup array
$depends_on[$gid] = $grade_items[$gid]->depends_on();
}
$errors = array();
$finalids = array();
$gids = array_keys($grade_items);
$failed = 0;
while (count($finalids) < count($gids)) { // work until all grades are final or error found
$count = 0;
foreach ($gids as $gid) {
if (in_array($gid, $finalids)) {
continue; // already final
}
if (!$grade_items[$gid]->needsupdate) {
$finalids[] = $gid; // we can make it final - does not need update
continue;
}
$doupdate = true;
foreach ($depends_on[$gid] as $did) {
if (!in_array($did, $finalids)) {
$doupdate = false;
continue; // this item depends on something that is not yet in finals array
}
}
//oki - let's update, calculate or aggregate :-)
if ($doupdate) {
$result = $grade_items[$gid]->regrade_final_grades($userid);
if ($result === true) {
$grade_items[$gid]->regrading_finished();
$grade_items[$gid]->check_locktime(); // do the locktime item locking
$count++;
$finalids[] = $gid;
} else {
$grade_items[$gid]->force_regrading();
$errors[$gid] = $result;
}