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question.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/>.
/**
* Essay question definition class.
*
* @package qtype
* @subpackage essayautograde
* @copyright 2018 Gordon Bateson ([email protected])
* @copyright based on work by 2009 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
// prevent direct access to this script
defined('MOODLE_INTERNAL') || die();
// require the parent class
require_once($CFG->dirroot.'/question/type/essay/question.php');
/**
* Represents an essayautograde question.
*
* We can use almost all the methods from the parent "qtype_essay_question" class.
* However, we override "make_behaviour" in case automatic grading is required.
* Additionally, we implement the methods required for automatic grading.
*
* @copyright 2018 Gordon Bateson ([email protected])
* @copyright based on work by 2009 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
// interface: question_automatically_gradable
// class: question_graded_automatically
class qtype_essayautograde_question extends qtype_essay_question implements question_automatically_gradable {
/** @var string */
public $feedback;
/** @var int */
public $feedbackformat;
/** @var string */
public $correctfeedback;
/** @var int */
public $correctfeedbackformat;
/** @var string */
public $incorrectfeedback;
/** @var int */
public $incorrectfeedbackformat;
/** @var string */
public $partiallycorrectfeedback;
/** @var int */
public $partiallycorrectfeedbackformat;
/** Array of records from the "question_answers" table */
protected $answers = null;
/** Information about the latest response */
protected $currentresponse = null;
/** Text content of response template */
protected $responsetemplatetext = null;
/** Text content of response sample */
protected $responsesampletext = null;
/**
* These variables are only used if needed
* to detect patterns in a student response
*/
private static $aliases = null;
private static $metachars = null;
private static $flipmetachars = null;
/**
* Override "make_behaviour" method in the parent class, "qtype_essay_question",
* because we may need to autograde the response
*/
public function make_behaviour(question_attempt $qa, $preferredbehaviour) {
if ($this->enableautograde) {
return question_engine::make_archetypal_behaviour($preferredbehaviour, $qa);
} else {
return question_engine::make_behaviour('manualgraded', $qa, $preferredbehaviour);
}
}
/**
* @param moodle_page the page we are outputting to.
* @return qtype_essay_format_renderer_base the response-format-specific renderer.
*/
public function get_format_renderer(moodle_page $page) {
return $page->get_renderer($this->plugin_name(), 'format_' . $this->responseformat);
}
/**
* Use by many of the behaviours to determine whether the student has provided
* enough of an answer for the question to be graded automatically, or whether
* it must be considered aborted.
*
* @param array $response responses, as returned by
* {@link question_attempt_step::get_qt_data()}.
* @return bool whether this response can be graded.
*/
public function is_gradable_response(array $response) {
if ($this->get_validation_error($response)) {
return false;
} else {
return true;
}
}
/**
* In situations where is_gradable_response() returns false, this method
* should generate a description of what the problem is.
* @return string the message.
*/
public function get_validation_error(array $response) {
// Check we have either a text answer or a file attachment.
if (empty($response['answer']) && empty($response['attachments'])) {
return get_string('noresponse', 'quiz');
}
// Ensure we have text response, if required
if ($this->responseformat == 'noinline') {
$responserequired = 0; // i.e. not required
} else {
$responserequired = $this->responserequired;
}
if ($responserequired && empty($response['answer'])) {
return get_string('pleaseinputtext', $this->plugin_name());
}
// Ensure we have attachments, if required
if ($this->itemtype == $this->plugin_constant('ITEM_TYPE_FILES')) {
$attachmentsrequired = $this->itemcount;
} else if ($this->attachments) {
$attachmentsrequired = $this->attachmentsrequired;
} else {
$attachmentsrequired = 0;
}
if ($attachmentsrequired && empty($response['attachments'])) {
return get_string('pleaseattachfiles', $this->plugin_name());
}
// Check that the answer is not simply the unaltered response template/sample.
if ($text = $this->get_response_answer_text($response)) {
$this->set_template_and_sample_text();
if ($this->is_similar_text($text, $this->responsetemplatetext)) {
return get_string('responseisnotoriginal', $this->plugin_name());
}
if ($this->is_similar_text($text, $this->responsesampletext)) {
return get_string('responseisnotoriginal', $this->plugin_name());
}
}
// No validation errors.
return '';
}
/**
* Grade a response to the question, returning a fraction between
* get_min_fraction() and get_max_fraction(), and the corresponding
* {@link question_state} right, partial or wrong.
*
* @param array $response responses, as returned by
* {@link question_attempt_step::get_qt_data()}.
* @return array (float, integer) the fraction, and the state.
*/
public function grade_response(array $response) {
$this->update_current_response($response);
if ($this->enableautograde) {
$fraction = $this->get_current_response('autofraction');
$state = question_state::graded_state_for_fraction($fraction);
} else {
// use manual grading, as per the "essay" question type
$state = question_state::manually_graded_state_for_fraction(null);
}
return array($fraction, $state);
}
/**
* Checks whether the users is allow to be served a particular file.
*
* @param question_attempt $qa the question attempt being displayed.
* @param question_display_options $options the options that control display of the question.
* @param string $component the name of the component we are serving files for.
* @param string $filearea the name of the file area.
* @param array $args the remaining bits of the file path.
* @param bool $forcedownload whether the user must be forced to download the file.
* @return bool true if the user can access this file.
*/
public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) {
if (empty($options) || empty($args)) {
return false; // shouldn't happen !!
}
switch ($component) {
case 'question':
if ($filearea == 'response_attachments') {
return ($this->attachments != 0);
}
if ($filearea == 'response_answer') {
return ($this->responseformat === 'editorfilepicker');
}
if ($filearea == 'hint') {
return $this->check_hint_file_access($qa, $options, $args);
}
if (in_array($filearea, $this->qtype->feedbackfields)) {
return $this->check_combined_feedback_file_access($qa, $options, $filearea, $args);
}
break;
case $this->plugin_name():
if ($filearea == 'graderinfo' && $options->manualcomment) {
return ($this->id == reset($args));
}
break;
}
return parent::check_file_access($qa, $options, $component, $filearea, $args, $forcedownload);
}
/**
* Get one of the question hints. The question_attempt is passed in case
* the question type wants to do something complex. For example, the
* multiple choice with multiple responses question type will turn off most
* of the hint options if the student has selected too many opitions.
* @param int $hintnumber Which hint to display. Indexed starting from 0
* @param question_attempt $qa The question_attempt.
*/
public function get_hint($hintnumber, question_attempt $qa) {
if (empty($this->hints[$hintnumber])) {
return null;
}
return $this->hints[$hintnumber];
}
/**
* format a hint for "multiple tries" behavior
*
* @param question_hint $hint
* @param question_attempt $qa
* @return string formatted hint text
*/
public function format_hint(question_hint $hint, question_attempt $qa) {
return $this->format_text($hint->hint, $hint->hintformat, $qa, 'question', 'hint', $hint->id);
}
/**
* Generate a brief, plain-text, summary of the correct answer to this question.
* This is used by various reports, and can also be useful when testing.
* This method will return null if such a summary is not possible, or
* inappropriate.
* @return string|null a plain text summary of the right answer to this question.
*/
public function get_right_answer_summary() {
return $this->html_to_text($this->questiontext, $this->questiontextformat);
}
///////////////////////////////////////////////////////
// non-standard methods (used only in this class)
///////////////////////////////////////////////////////
/**
* qtype is plugin name without leading "qtype_"
*/
protected function qtype() {
return substr($this->plugin_name(), 6);
// = return $this->qtype->name();
}
/**
* Plugin name is class name without trailing "_question"
*/
protected function plugin_name() {
return substr(get_class($this), 0, -9);
// = return $this->qtype->plugin_name();
}
/**
* Fetch a constant from the plugin class in "questiontype.php".
*/
public function plugin_constant($name) {
$plugin = $this->plugin_name();
return constant($plugin.'::'.$name);
}
public function update_current_response($response, $displayoptions=null) {
global $CFG, $PAGE, $USER;
if (empty($CFG->enableplagiarism)) {
$enableplagiarism = false;
$plagiarismparams = array();
$context = null;
$course = null;
$cm = null;
} else {
$enableplagiarism = true;
require_once($CFG->dirroot.'/lib/plagiarismlib.php');
list($context, $course, $cm) = get_context_info_array($PAGE->context->id);
$plagiarismparams = array(
'userid' => $USER->id
);
if ($course) {
$plagiarismparams['course'] = $course->id;
}
if ($cm) {
$plagiarismparams['cmid'] = $cm->id;
$plagiarismparams[$cm->modname] = $cm->instance;
}
}
// Initialize data about this $response
$count = 0;
$bands = array();
$phrases = array();
$myphrases = array();
$plagiarism = array();
$breaks = 0;
$rawpercent = 0;
$rawfraction = 0.0;
$autopercent = 0;
$autofraction = 0.0;
$currentcount = 0;
$currentpercent = 0;
$partialcount = 0;
$partialpercent = 0;
$completecount = 0;
$completepercent = 0;
if ($text = $this->get_response_answer_text($response)) {
$this->set_template_and_sample_text();
if ($this->is_similar_text($text, $this->responsetemplatetext)) {
$text = '';
} else if ($this->is_similar_text($text, $this->responsesampletext)) {
$text = '';
}
}
if ($enableplagiarism) {
$plagiarism[] = plagiarism_get_links($plagiarismparams + array('content' => $text));
}
if (empty($response) || empty($response['attachments'])) {
$files = array();
} else {
$files = $response['attachments']->get_files();
}
if ($enableplagiarism) {
foreach ($files as $file) {
$plagiarism[] = plagiarism_get_links($plagiarismparams + array('file' => $file));
}
}
// detect common errors
list($errors, $errortext, $errorpercent) = $this->get_common_errors($text);
// Get stats for this $text.
$stats = $this->get_stats($text, $files, $errors);
// Count items in $text.
switch ($this->itemtype) {
case $this->plugin_constant('ITEM_TYPE_CHARS'): $count = $stats->chars; break;
case $this->plugin_constant('ITEM_TYPE_WORDS'): $count = $stats->words; break;
case $this->plugin_constant('ITEM_TYPE_SENTENCES'): $count = $stats->sentences; break;
case $this->plugin_constant('ITEM_TYPE_PARAGRAPHS'): $count = $stats->paragraphs; break;
case $this->plugin_constant('ITEM_TYPE_FILES'): $count = $stats->files; break;
}
// Get records from "question_answers" table.
$answers = $this->get_answers();
if (empty($answers) || ($this->itemtype == $this->plugin_constant('ITEM_TYPE_FILES'))) {
// Set fractional grade from number of items.
if (empty($this->itemcount)) {
$rawfraction = 0.0;
} else {
$rawfraction = ($count / $this->itemcount);
}
} else {
// Cache plugin constants.
$ANSWER_TYPE_BAND = $this->plugin_constant('ANSWER_TYPE_BAND');
$ANSWER_TYPE_PHRASE = $this->plugin_constant('ANSWER_TYPE_PHRASE');
// override "addpartialgrades" with incoming form data, if necessary
$addpartialgrades = $this->addpartialgrades;
$addpartialgrades = optional_param('addpartialgrades', $addpartialgrades, PARAM_INT);
// set fractional grade from item count and target phrases
$rawfraction = 0.0;
$checkbands = true;
foreach ($answers as $answer) {
switch ($answer->type) {
case $ANSWER_TYPE_BAND:
if ($checkbands) {
if ($answer->answer > $count) {
$checkbands = false;
}
// update band counts and percents
$completecount = $currentcount;
$completepercent = $currentpercent;
$currentcount = $answer->answer;
$currentpercent = $answer->answerformat;
}
$bands[$answer->answer] = $answer->answerformat;
break;
case $ANSWER_TYPE_PHRASE:
if ($search = trim($answer->feedback)) {
if ($match = $this->search_text($search, $text, $answer->fullmatch, $answer->casesensitive, $answer->ignorebreaks)) {
list($pos, $length, $match) = $match;
$myphrases[$match] = $search;
$rawfraction += ($answer->feedbackformat / 100);
} else if (empty($answer->ignorebreaks) && preg_match('/\\bAND|ANY\\b/', $search) && preg_match("/[\r\n]/us", $text)) {
$breaks++;
}
$phrases[$search] = $answer->feedbackformat;
}
break;
}
}
// update band counts for top grade band, if necessary
if ($checkbands) {
$completecount = $currentcount;
$completepercent = $currentpercent;
}
// set the item width of the current band
// and the percentage width of the current band
$currentcount = ($currentcount - $completecount);
$currentpercent = ($currentpercent - $completepercent);
// set the number of items to be graded by the current band
// and thus calculate the percent awarded by the current band
if ($addpartialgrades && $currentcount) {
$partialcount = ($count - $completecount);
$partialpercent = round(($partialcount / $currentcount) * $currentpercent);
} else {
$partialcount = 0;
$partialpercent = 0;
}
$rawfraction += (($completepercent + $partialpercent) / 100);
}
// deduct penalties for common errors
$rawfraction -= ($errorpercent / 100);
// make sure $autofraction is in range 0.0 - 1.0
$autofraction = min(1.0, max(0.0, $rawfraction));
// we can now set $autopercent and $rawpercent
$rawpercent = round($rawfraction * 100);
$autopercent = round($autofraction * 100);
// store this information, in case it is needed elswhere
$this->save_current_response('text', $text);
$this->save_current_response('stats', $stats);
$this->save_current_response('count', $count);
$this->save_current_response('bands', $bands);
$this->save_current_response('phrases', $phrases);
$this->save_current_response('myphrases', $myphrases);
$this->save_current_response('plagiarism', $plagiarism);
$this->save_current_response('breaks', $breaks);
$this->save_current_response('rawpercent', $rawpercent);
$this->save_current_response('rawfraction', $rawfraction);
$this->save_current_response('autopercent', $autopercent);
$this->save_current_response('autofraction', $autofraction);
$this->save_current_response('partialcount', $partialcount);
$this->save_current_response('partialpercent', $partialpercent);
$this->save_current_response('completecount', $completecount);
$this->save_current_response('completepercent', $completepercent);
$this->save_current_response('displayoptions', $displayoptions);
$this->save_current_response('errors', $errors);
$this->save_current_response('errortext', $errortext);
$this->save_current_response('errorpercent', $errorpercent);
}
/**
* set_template_and_sample_text
*/
protected function set_template_and_sample_text() {
if ($this->responsetemplatetext === null) {
$this->responsetemplatetext = $this->to_plain_text(
$this->responsetemplate, $this->responsetemplateformat
);
}
if ($this->responsesampletext === null) {
$this->responsesampletext = $this->to_plain_text(
$this->responsesample, $this->responsesampleformat
);
}
}
/**
* get_response_answer_text($response)
*/
protected function get_response_answer_text($response) {
if (empty($response) || empty($response['answer'])) {
return '';
}
return $this->to_plain_text($response['answer'], $response['answerformat']);
}
/**
* to_plain_text
*/
protected function to_plain_text($text, $format) {
if (empty($text)) {
return '';
}
$plaintext = question_utils::to_plain_text($text, $format, array('para' => false));
$plaintext = $this->standardize_white_space($plaintext);
return $plaintext;
}
/**
* standardize_white_space($text)
*/
protected function standardize_white_space($text) {
// Standardize white space in $text.
// Html-entity for non-breaking space, $nbsp;,
// is converted to a unicode character, "\xc2\xa0",
// that can be simulated by two ascii chars (194,160)
$text = str_replace(chr(194).chr(160), ' ', $text);
$text = preg_replace('/[ \t]+/', ' ', trim($text));
$text = preg_replace('/( *[\x0A-\x0D]+ *)+/s', "\n", $text);
return $text;
}
/**
* is_similar_text($a, $b, $thresholdpercent=10)
*/
protected function is_similar_text($a, $b, $thresholdpercent=10) {
if (empty($a)) {
$a = '';
$alen = 0;
} else {
$a = strip_tags($a);
$alen = core_text::strlen($a);
}
if (empty($b)) {
$b = '';
$blen = 0;
} else {
$b = strip_tags($b);
$blen = core_text::strlen($b);
}
// If possible, we compare with a simple comparison
if ($alen==$blen && $a==$b) {
return true;
}
// Cache the length of the longer of the two strings.
$maxlen = max($alen, $blen);
// Compare short strings (of up to 255 chars) with "levenshtein()" because its faster.
// Compare long strings with "similar_text()" because it can handle texts of any length.
if ($maxlen <= 255) {
// "levenshtein()" returns the minimal number of characters
// you have to replace, insert or delete to transform $a into $b
// i.e. the lower the number, the more similar the texts are.
$fraction = (levenshtein($a, $b) / $maxlen);
} else {
// "similar_text()" returns the number of matching chars in both $a and $b,
// i.e. the higher number, the more similar the texts are.
$fraction = (($maxlen - similar_text($a, $b)) / $maxlen);
}
return (round($fraction * 100, 2) <= $thresholdpercent);
}
/**
* get_common_errors
*/
protected function get_common_errors($text) {
global $DB;
$errors = array();
$matches = array();
if (empty($this->errorcmid)) {
$cm = null;
} else {
$cm = get_coursemodule_from_id('', $this->errorcmid);
}
if (empty($this->errorpercent)) {
$percent = 0;
} else {
$percent = $this->errorpercent;
}
if ($cm) {
$entryids = array();
if ($entries = $DB->get_records('glossary_entries', array('glossaryid' => $cm->instance), 'concept')) {
foreach ($entries as $entry) {
if ($match = $this->glossary_entry_search_text($entry, $entry->concept, $text)) {
list($pos, $length, $match) = $match;
$errors[$match] = $this->glossary_entry_link($cm->name, $entry, $match);
$matches[$pos] = (object)array('pos' => $pos, 'length' => $length, 'match' => $match);
} else {
$entryids[] = $entry->id;
}
}
}
if (count($entryids)) {
list($select, $params) = $DB->get_in_or_equal($entryids);
if ($aliases = $DB->get_records_select('glossary_alias', "entryid $select", $params)) {
foreach ($aliases as $alias) {
$entry = $entries[$alias->entryid];
if ($match = $this->glossary_entry_search_text($entry, $alias->alias, $text)) {
list($pos, $length, $match) = $match;
$errors[$match] = $this->glossary_entry_link($cm->name, $entry, $match);
$matches[$pos] = (object)array('pos' => $pos, 'length' => $length, 'match' => $match);
}
}
}
}
}
$errortext = $text;
if (count($matches)) {
// sort error $matches from last position to first position
krsort($matches);
foreach ($matches as $match) {
$pos = $match->pos;
$length = $match->length;
$match = $errors[$match->match]; // a link to the glossary
$errortext = substr_replace($errortext, $match, $pos, $length);
}
}
if (count($errors)) {
// sort the common errors by length (shortest to longest)
// https://stackoverflow.com/questions/3955536/php-sort-hash-array-by-key-length
$matches = array_keys($errors);
$lengths = array_map('core_text::strlen', $matches);
array_multisort($lengths, SORT_DESC, $matches, $errors);
// remove matches that are substrings of longer matches
while ($match = array_shift($matches)) {
$search = '/^'.preg_quote($match, '/').'.+/iu';
$search = preg_grep($search, $matches);
if (count($search)) {
unset($errors[$match]);
}
}
}
return array($errors, $errortext, count($errors) * $percent);
}
/**
* glossary_entry_search_text
*
* @param object $entry
* @param string $match
* @param string $text
* @return mixed array($match, $pos, $length) if matching substring in $text; otherwise ""
*/
protected function glossary_entry_search_text($entry, $search, $text) {
if (empty($entry->usedynalink)) {
$fullmatch = $this->errorfullmatch;
$casesensitive = $this->errorcasesensitive;
} else {
$fullmatch = $entry->fullmatch;
$casesensitive = $entry->casesensitive;
}
$ignorebreaks = $this->errorignorebreaks;
return $this->search_text($search, $text, $fullmatch, $casesensitive, $ignorebreaks);
}
/**
* search_text
*
* @param string $match
* @param string $text
* @return boolean TRUE if $text mattches the $match; otherwise FALSE;
*/
protected function search_text($search, $text, $fullmatch=false, $casesensitive=false, $ignorebreaks=true) {
$text = trim($text);
if ($text=='') {
return false; // unexpected ?!
}
$search = trim($search);
if ($search=='') {
return false; // shouldn't happen !!
}
if (self::$aliases===null) {
// human readable aliases for regexp strings
self::$aliases = array(' OR ' => '|',
' OR' => '|',
'OR ' => '|',
' , ' => '|',
' ,' => '|',
', ' => '|',
',' => '|',
' AND ' => '\\b.*\\b',
' AND' => '\\b.*\\b',
'AND ' => '\\b.*\\b',
' ANY ' => '\\b.*\\b',
' ANY' => '\\b.*\\b',
'ANY ' => '\\b.*\\b');
// allowable regexp strings and their internal aliases
self::$metachars = array('^' => 'CARET',
'$' => 'DOLLAR',
'.' => 'DOT',
'?' => 'QUESTION_MARK',
'*' => 'ASTERISK',
'+' => 'PLUS_SIGN',
'|' => 'VERTICAL_BAR',
'-' => 'HYPHEN',
':' => 'COLON',
'!' => 'EXCLAMATION_MARK',
'=' => 'EQUALS_SIGN',
'(' => 'OPEN_ROUND',
')' => 'CLOSE_ROUND',
'[' => 'OPEN_SQUARE',
']' => 'CLOSE_SQUARE',
'{' => 'OPEN_CURLY',
'}' => 'CLOSE_CURLY',
'<' => 'OPEN_ANGLE',
'>' => 'CLOSE_ANGLE',
'\\' => 'BACKSLASH',
'\b' => 'WORD_BREAK');
self::$flipmetachars = array_flip(self::$metachars);
}
$regexp = strtr($search, self::$aliases);
$regexp = strtr($regexp, self::$metachars);
$regexp = preg_quote($regexp, '/');
$regexp = strtr($regexp, self::$flipmetachars);
if ($fullmatch) {
$regexp = "\\b$regexp\\b";
}
$regexp = "/$regexp/u"; // unicode match
if (empty($casesensitive)) {
$regexp .= 'i';
}
if ($ignorebreaks) {
$regexp .= 's';
}
if (preg_match($regexp, $text, $match, PREG_OFFSET_CAPTURE)) {
list($match, $offset) = $match[0];
$length = strlen($match);
if (core_text::strlen($search) < core_text::strlen($match[0])) {
$match = $search;
}
return array($offset, $length, $match);
} else {
return ''; // no matches
}
}
/**
* Store information about latest response to this question
*
* @param string $name
* @param string $value
* @return void, but will update currentresponse property of this object
*/
public function glossary_entry_link($glossaryname, $entry, $text) {
$params = array('eid' => $entry->id,
'displayformat' => 'dictionary');
$url = new moodle_url('/mod/glossary/showentry.php', $params);
$params = array('target' => '_blank',
'title' => $glossaryname.': '.$entry->concept,
'class' => 'glossary autolink concept glossaryid'.$entry->glossaryid);
return html_writer::link($url, $text, $params);
}
/**
* Store information about latest response to this question
*
* @param string $name
* @param string $value
* @return void, but will update currentresponse property of this object
*/
public function save_current_response($name, $value) {
if ($this->currentresponse===null) {
$this->currentresponse = new stdClass();
}
$this->currentresponse->$name = $value;
}
/**
* Returns information about latest response to this question
*
* @return string
*/
public function get_current_response($name='') {
if ($this->currentresponse===null) {
return $this->currentresponse;
}
if (empty($name)) {
return $this->currentresponse;
}
return $this->currentresponse->$name;
}
/**
* get "answers" ordered by "type" (=fraction)
* and "percent" (=answer/feedback format)
*/
public function get_answers() {
global $DB;
if ($this->answers===null) {
if ($this->answers = $DB->get_records('question_answers', array('question' => $this->id), 'id')) {
$ANSWER_TYPE = $this->plugin_constant('ANSWER_TYPE');
$ANSWER_FULL_MATCH = $this->plugin_constant('ANSWER_FULL_MATCH');
$ANSWER_CASE_SENSITIVE = $this->plugin_constant('ANSWER_CASE_SENSITIVE');
$ANSWER_IGNORE_BREAKS = $this->plugin_constant('ANSWER_IGNORE_BREAKS');
foreach ($this->answers as $id => $answer) {
$fraction = intval($answer->fraction);
$this->answers[$id]->fraction = $fraction;
$this->answers[$id]->type = ($fraction & $ANSWER_TYPE);
$this->answers[$id]->fullmatch = (($fraction & $ANSWER_FULL_MATCH) ? 1 : 0);
$this->answers[$id]->casesensitive = (($fraction & $ANSWER_CASE_SENSITIVE) ? 1 : 0);
$this->answers[$id]->ignorebreaks = (($fraction & $ANSWER_IGNORE_BREAKS) ? 1 : 0);
}
} else {
$this->answers = array();
}
}
return $this->answers;
}
/**
* get_stats
*/
protected function get_stats($text, $files, $errors) {
$precision = 1;
$stats = (object)array('chars' => $this->get_stats_chars($text),
'words' => $this->get_stats_words($text),
'sentences' => $this->get_stats_sentences($text),
'paragraphs' => $this->get_stats_paragraphs($text),
'files' => $this->get_stats_files($files),
'longwords' => $this->get_stats_longwords($text),
'uniquewords' => $this->get_stats_uniquewords($text),
'fogindex' => 0,
'commonerrors' => count($errors),
'lexicaldensity' => 0,
'charspersentence' => 0,
'wordspersentence' => 0,
'longwordspersentence' => 0,
'sentencesperparagraph' => 0);
if ($stats->words) {
$stats->lexicaldensity = round(($stats->uniquewords / $stats->words) * 100, 0).'%';
}
if ($stats->sentences) {
$stats->charspersentence = round($stats->chars / $stats->sentences, $precision);
$stats->wordspersentence = round($stats->words / $stats->sentences, $precision);
$stats->longwordspersentence = round($stats->longwords / $stats->sentences, $precision);
}
if ($stats->wordspersentence) {
$stats->fogindex = ($stats->wordspersentence + $stats->longwordspersentence);
$stats->fogindex = round($stats->fogindex * 0.4, $precision);
}
if ($stats->paragraphs) {
$stats->sentencesperparagraph = round($stats->sentences / $stats->paragraphs, $precision);
}
return $stats;
}
/**
* get_stats
*/
protected function get_stats_chars($text) {
return core_text::strlen($text);
}
/**
* get_stats_words
*/
protected function get_stats_words($text) {
return str_word_count($text, 0);
}
/**
* get_stats_sentences
*/
protected function get_stats_sentences($text) {
$items = preg_split('/[!?.]+(?![0-9])/', $text);
$items = array_filter($items);
return count($items);
}
/**
* get_stats_paragraphs
*/
protected function get_stats_paragraphs($text) {
$items = explode("\n", $text);
$items = array_filter($items);
return count($items);
}
/**
* get_stats_files
*/
protected function get_stats_files($files) {
return count($files);
}
/**
* get_stats_uniquewords
*/
protected function get_stats_uniquewords($text) {
$items = core_text::strtolower($text);
$items = str_word_count($items, 1);
$items = array_unique($items);
return count($items);
}
/**
* get_stats_longwords
*/
protected function get_stats_longwords($text) {
$count = 0;
$items = core_text::strtolower($text);
$items = str_word_count($items, 1);
$items = array_unique($items);
foreach ($items as $item) {
if ($this->count_syllables($item) > 2) {
$count++;
}
}
return $count;
}
/**
* count_syllables
*
* based on: https://github.com/e-rasvet/sassessment/blob/master/lib.php
*/
protected function count_syllables($word) {
// https://github.com/vanderlee/phpSyllable (multilang)
// https://github.com/DaveChild/Text-Statistics (English only)
// https://pear.php.net/manual/en/package.text.text-statistics.intro.php
// https://pear.php.net/package/Text_Statistics/docs/latest/__filesource/fsource_Text_Statistics__Text_Statistics-1.0.1TextWord.php.html
$str = strtoupper($word);
if (strlen($str) < 2) {
$count = 1;
} else {
$count = 0;
// Detect syllables for double-vowels.
$vowelcount = 0;
$vowels = array('AA','AE','AI','AO','AU','AY',
'EA','EE','EI','EO','EU','EY',
'IA','IE','II','IO','IU','IY',
'OA','OE','OI','OO','OU','OY',
'UA','UE','UI','UO','UU','UY',
'YA','YE','YI','YO','YU','YY');
$str = str_replace($vowels, '', $str, $vowelcount);
$count += $vowelcount;
// Cache the final letter, in case it is an "e"
$finalletter = substr($str, -1);
// Detect syllables for single-vowels.
$vowelcount = 0;
$vowels = array('A','E','I','O','U','Y');
$str = str_replace($vowels, '', $str, $vowelcount);
$count += $vowelcount;