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view_compare.php
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view_compare.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/>.
/**
* Page to compare two assignment, when the user click on the similarity percentage
*
* @package plagiarism
* @subpackage programming
* @author thanhtri
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once(__DIR__.'/../../config.php');
require_once(__DIR__.'/reportlib.php');
global $OUTPUT, $PAGE, $DB, $USER, $CFG;
//----------------------------------------Processing of parameters----------------------------------------------//
$result_id = required_param('id', PARAM_INT); //id in the plagiarism_programming_reslt table
$anchor = optional_param('anchor', -1, PARAM_INT);
$result_record = $DB->get_record('plagiarism_programming_reslt', array('id'=>$result_id));
$report_rec = $DB->get_record('plagiarism_programming_rpt', array('id'=>$result_record->reportid));
$result_record = plagiarism_programming_transform_similarity_pair($result_record);
// get the report directory
$cmid = $report_rec->cmid;
$detector = $report_rec->detector;
require_once(__DIR__.'/'.$detector.'_tool.php');
if ($detector=='jplag') {
$directory = jplag_tool::get_report_path($report_rec);
} else {
$directory = moss_tool::get_report_path($report_rec);
}
//-------------------------------------end parameter processing--------------------------------------------------//
// create page context
if (!$course_module = $DB->get_record('course_modules', array('id'=>$cmid))) {
redirect($CFG->wwwroot, 'Invalid course module id');
}
$course = $DB->get_record('course', array('id'=>$course_module->course));
if (!$course) {
redirect($CFG->wwwroot, 'Invalid course id');
}
require_login($course, true, $course_module);
//------------------------------------- authorisation: only teacher can see the names -----------------------------//
$context = context_module::instance($cmid);
$is_teacher = has_capability('mod/assignment:grade', $context);
if (!$is_teacher) {
// check if he is allowed to see the assignment
if (!has_capability('mod/assignment:submit', $context) || // must have submission right to his assignment
!$DB->get_field('plagiarism_programming', 'auto_publish', array('cmid' => $cmid))) { // and permission to see the report
redirect($CFG->wwwroot, "You don't have permission to see this page");
}
if ($result_record->student1_id==$USER->id) {
$student1 = 'yours';
$student2 = 'another\'s';
} else if ($result_record->student2_id==$USER->id) {
$student1 = 'another\'s';
$student2 = 'yours';
} else {
// this condition cannot happen unless users fabricate the link
redirect($CFG->wwwroot, "You can only see the report on your work");
}
} else {
// teacher can see the students' name
$users = $DB->get_records_list('user', 'id', array($result_record->student1_id, $result_record->student2_id),
'firstname,lastname,idnumber');
$student1 = isset($users[$result_record->student1_id]) ?
fullname($users[$result_record->student1_id]) :
$result_record->student1_id;
$student2 = isset($users[$result_record->student2_id]) ?
fullname($users[$result_record->student2_id]) :
$result_record->student2_id;
}
//---------------------------------end autorisation--------------------------------------------------------------------//
$title = get_string('comparison_title', 'plagiarism_programming');
$heading = get_string('comparison', 'plagiarism_programming');
$PAGE->set_pagelayout('base'); // don't want the blocks to save space
$PAGE->set_url(me());
$PAGE->set_title($title);
$PAGE->set_heading($heading);
$PAGE->navbar->add(get_string('similarity_report', 'plagiarism_programming'), "view.php?cmid=$cmid&tool=$report_rec->detector");
$PAGE->navbar->add($heading);
echo $OUTPUT->header();
// the top bar
$average_similarity = ($result_record->similarity1+$result_record->similarity2)/2;
$content = html_writer::tag('div',
get_string('and', '', array('one'=>$student1, 'two'=>$student2)). "($average_similarity%)",
array('class'=>'compare_header'));
$result1 = plagiarism_programming_reconstruct_file($result_record->student1_id, $result_record->student2_id, $directory);
$result2 = plagiarism_programming_reconstruct_file($result_record->student2_id, $result_record->student1_id, $directory);
$sumary_data = plagiarism_programming_get_summary_data($result1['list'], $student1, $result_record->similarity1,
$result2['list'], $student2, $result_record->similarity2);
// place holder for summary table, content will be rendered via javascript
echo html_writer::tag('div', $content."<div class='simiarity_table_holder'></div>",
array('name'=>'link', 'frameborder'=>'0', 'width'=>'40%',
'class'=>'programming_result_comparison_top_left'));
$content='';
if ($is_teacher) { // only teachers can mark the suspicious pairs, so add the select box
$actions = array(
'Y'=>get_string('mark_suspicious', 'plagiarism_programming'),
'N'=>get_string('mark_nonsuspicious', 'plagiarism_programming')
);
$content .= html_writer::label(get_string('mark_select_title', 'plagiarism_programming'), 'action_menu').' ';
$content .= html_writer::select($actions, 'mark', $result_record->mark, 'Action...', array('id'=>'action_menu'));
}
$img_src = '';
if ($result_record->mark=='Y') {
$img_src = 'pix/suspicious.png';
} else if ($result_record->mark=='N') {
$img_src = 'pix/normal.png';
}
$content .= html_writer::empty_tag('img', array('src'=>$img_src, 'id'=>'mark_image', 'class'=>'programming_result_mark_img'));
// select the report history
$similarity_history = plagiarism_programming_get_student_similarity_history($result_record);
$report_select = array();
foreach ($similarity_history as $pair) {
$report_select[$pair->id] = date('d M h.i A', $pair->time_created);
}
$content .= '<br/><br/>';
$content .= html_writer::label(get_string('version'), 'report_version').' ';
$content .= html_writer::select($report_select, 'report_version', $result_record->id, null, array('id'=>'report_version'));
echo html_writer::tag('div', "<div>$content</div>", array('class'=>'programming_result_comparison_top_right'));
// separator
echo html_writer::tag('div', '', array('class'=>'programming_result_comparison_separator'));
// left panel
echo html_writer::tag('div', $result1['content'], array('class'=>'programming_result_comparison_bottom_left'));
// right panel
echo html_writer::tag('div', $result2['content'], array('class'=>'programming_result_comparison_bottom_right'));
//----- name lookup table for javascript--------
$result_select = "reportid=$report_rec->id ".
"AND (student1_id='$result_record->student1_id' OR student1_id='$result_record->student2_id' ".
"OR student2_id='$result_record->student1_id' OR student2_id='$result_record->student2_id')";
$result = $DB->get_records_select('plagiarism_programming_reslt', $result_select);
$all_names = null;
plagiarism_programming_create_student_lookup_table($result, $is_teacher, $all_names);
//----------id lookup table for javascript-----------------------
$result_id_table = array();
foreach ($result as $pair) {
$std1 = max($pair->student1_id, $pair->student2_id);
$std2 = min($pair->student1_id, $pair->student2_id);
$result_id_table[$std1][$std2] = $pair->id;
}
$result_info = array('id'=>$result_id, 'mark'=>$result_record->mark, 'student1'=>$result_record->student1_id,
'student2'=>$result_record->student2_id);
$jsmodule = array(
'name' => 'plagiarism_programming',
'fullpath' => '/plagiarism/programming/compare_code.js',
'requires' => array('base', 'overlay', 'node', 'json', 'io', 'datatable', 'datatable-scroll'),
'strings' => array(
array('show_similarity_to_others', 'plagiarism_programming'),
array('history_char', 'plagiarism_programming'),
array('date', 'moodle')
)
);
$PAGE->requires->js_init_call('M.plagiarism_programming.compare_code.init',
array($result_info, $all_names, $sumary_data, $result_id_table, $anchor), true, $jsmodule);
echo $OUTPUT->footer();
function plagiarism_programming_get_summary_data($list1, $student1, $rate1, $list2, $student2, $rate2) {
// header
$data = array();
foreach ($list1 as $anchor => $portion) {
$line1 = $portion['line'];
$file1 = $portion['file'];
$line2 = $list2[$anchor]['line'];
$file2 = $list2[$anchor]['file'];
$color = $portion['color'];
$data[]= array(
'color' => "#$color",
'student1' => "<a style='color:#$color' class='similarity_link' href='sim_$anchor'>$file1 ($line1)</a>",
'student2' => "<a style='color:#$color' class='similarity_link' href='sim_$anchor'>$file2 ($line2)</a>",
);
}
$columns = array(
array('key' => 'color', 'label' => ' '),
array('key' => 'student1', 'label' => "$student1 ($rate1%)"),
array('key' => 'student2', 'label' => "$student2 ($rate2%)"),
);
return array(
'columns' => $columns,
'data' => $data,
);
}
function plagiarism_programming_reconstruct_file($student_id, $other_student_id, $dir) {
$code_file = $dir.'/'.$student_id;
$dom = new DOMDocument();
$dom->preserveWhiteSpace = false;
$content = file_get_contents($code_file);
@$dom->loadHTML('<pre>'.$content.'</pre>');
$pre = $dom->childNodes->item(1)->firstChild->firstChild; // root->html->body->pre
$line_no = 1;
$current_file = '';
$portion_list = array();
$node = $pre->firstChild;
while ($node!=null) {
if ($node->nodeType==XML_TEXT_NODE) {
$line_no += substr_count($node->nodeValue, "\n"); // count the line
} else if ($node->tagName=='h3') {
$current_file = $node->nodeValue;
$line_no = 1;
} else if ($node->tagName=='span' && $node->getAttribute('type')=='begin') {
$sid = explode(',', $node->getAttribute('sid'));
$key = array_search($other_student_id, $sid);
if ($key!==false) { // matching portion
$anchors = explode(',', $node->getAttribute('anchor'));
$anchor = $anchors[$key];
$colors = explode(',', $node->getAttribute('color'));
$color = $colors[$key];
$font = $dom->createElement('font');
$font->setAttribute('color', $color);
$font->setAttribute('class', 'sim_'.$anchor);
$font = $node->parentNode->insertBefore($font, $node);
$sibling = $node->nextSibling;
$start_line = $line_no;
while (!plagiarism_programming_end_span_node($sibling, $other_student_id)) {
if ($sibling->nodeType==XML_TEXT_NODE) {
$line_no += substr_count($sibling->nodeValue, "\n");
}
$next_sibling = $sibling->nextSibling;
$font->appendChild($sibling);
$sibling = $next_sibling;
}
if (count($sid)==1) { // remove the mark if this portion has in common with only one student
$node->parentNode->removeChild($node);
$sibling->parentNode->removeChild($sibling);
} else { // if not, move the marks within the font
$font->insertBefore($node, $font->firstChild);
$font->appendChild($sibling);
}
$node = $font;
$portion_list[$anchor] = array('file'=>$current_file, 'line'=>"$start_line-$line_no", 'color'=>$color);
}
}
$node = $node->nextSibling;
}
return array('list'=>$portion_list, 'content'=>$dom->saveHTML());
}
function plagiarism_programming_end_span_node($node, $student_id) {
if ($node->nodeType==XML_ELEMENT_NODE &&
$node->tagName=='span' &&
$node->getAttribute('type')=='end') {
$end_sid = explode(',', $node->getAttribute('sid'));
return in_array($student_id, $end_sid);
} else {
return false;
}
}