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moodle/mod/book/locallib.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/>.
/**
* Book module local lib functions
*
* @package mod_book
* @copyright 2010-2011 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die;
require_once(__DIR__.'/lib.php');
require_once($CFG->libdir.'/filelib.php');
/**
* The following defines are used to define how the chapters and subchapters of a book should be displayed in that table of contents.
* BOOK_NUM_NONE No special styling will applied and the editor will be able to do what ever thay want in the title
* BOOK_NUM_NUMBERS Chapters and subchapters are numbered (1, 1.1, 1.2, 2, ...)
* BOOK_NUM_BULLETS Subchapters are indented and displayed with bullets
* BOOK_NUM_INDENTED Subchapters are indented
*/
define('BOOK_NUM_NONE', '0');
define('BOOK_NUM_NUMBERS', '1');
define('BOOK_NUM_BULLETS', '2');
define('BOOK_NUM_INDENTED', '3');
/**
* The following defines are used to define the navigation style used within a book.
* BOOK_LINK_TOCONLY Only the table of contents is shown, in a side region.
* BOOK_LINK_IMAGE Arrows link to previous/next/exit pages, in addition to the TOC.
* BOOK_LINK_TEXT Page names and arrows link to previous/next/exit pages, in addition to the TOC.
*/
define ('BOOK_LINK_TOCONLY', '0');
define ('BOOK_LINK_IMAGE', '1');
define ('BOOK_LINK_TEXT', '2');
/**
* Preload book chapters and fix toc structure if necessary.
*
* Returns array of chapters with standard 'pagenum', 'id, pagenum, subchapter, title, content, contentformat, hidden'
* and extra 'parent, number, subchapters, prev, next'.
* Please note the content/text of chapters is not included.
*
* @param stdClass $book
* @return array of id=>chapter
*/
function book_preload_chapters($book) {
global $DB;
$chapters = $DB->get_records('book_chapters', array('bookid' => $book->id), 'pagenum', 'id, pagenum,
subchapter, title, content, contentformat, hidden');
if (!$chapters) {
return array();
}
$prev = null;
$prevsub = null;
$first = true;
$hidesub = true;
$parent = null;
$pagenum = 0; // chapter sort
$i = 0; // main chapter num
$j = 0; // subchapter num
foreach ($chapters as $id => $ch) {
$oldch = clone($ch);
$pagenum++;
$ch->pagenum = $pagenum;
if ($first) {
// book can not start with a subchapter
$ch->subchapter = 0;
$first = false;
}
if (!$ch->subchapter) {
if ($ch->hidden) {
if ($book->numbering == BOOK_NUM_NUMBERS) {
$ch->number = 'x';
} else {
$ch->number = null;
}
} else {
$i++;
$ch->number = $i;
}
$j = 0;
$prevsub = null;
$hidesub = $ch->hidden;
$parent = $ch->id;
$ch->parent = null;
$ch->subchapters = array();
} else {
$ch->parent = $parent;
$ch->subchapters = null;
$chapters[$parent]->subchapters[$ch->id] = $ch->id;
if ($hidesub) {
// all subchapters in hidden chapter must be hidden too
$ch->hidden = 1;
}
if ($ch->hidden) {
if ($book->numbering == BOOK_NUM_NUMBERS) {
$ch->number = 'x';
} else {
$ch->number = null;
}
} else {
$j++;
$ch->number = $j;
}
}
if ($oldch->subchapter != $ch->subchapter or $oldch->pagenum != $ch->pagenum or $oldch->hidden != $ch->hidden) {
// update only if something changed
$DB->update_record('book_chapters', $ch);
}
$chapters[$id] = $ch;
}
return $chapters;
}
/**
* Returns the title for a given chapter
*
* @param int $chid
* @param array $chapters
* @param stdClass $book
* @param context_module $context
* @return string
*/
function book_get_chapter_title($chid, $chapters, $book, $context) {
$ch = $chapters[$chid];
$title = trim(format_string($ch->title, true, array('context'=>$context)));
$numbers = array();
if ($book->numbering == BOOK_NUM_NUMBERS) {
if ($ch->parent and $chapters[$ch->parent]->number) {
$numbers[] = $chapters[$ch->parent]->number;
}
if ($ch->number) {
$numbers[] = $ch->number;
}
}
if ($numbers) {
$title = implode('.', $numbers) . '. ' . $title;
}
return $title;
}
/**
* Add the book TOC sticky block to the default region.
*
* @param array $chapters The Chapters in the book
* @param stdClass $chapter The current chapter
* @param stdClass $book The book
* @param stdClass $cm The course module
* @param bool|null $edit Whether the user is editing
*/
function book_add_fake_block($chapters, $chapter, $book, $cm, $edit = null) {
global $PAGE, $USER;
if ($edit === null) {
if (has_capability('mod/book:edit', context_module::instance($cm->id))) {
if (isset($USER->editing)) {
$edit = $USER->editing;
} else {
$edit = 0;
}
} else {
$edit = 0;
}
}
$toc = book_get_toc($chapters, $chapter, $book, $cm, $edit);
$bc = new block_contents();
$bc->title = get_string('toc', 'mod_book');
$bc->attributes['class'] = 'block block_book_toc';
$bc->content = $toc;
$defaultregion = $PAGE->blocks->get_default_region();
$PAGE->blocks->add_fake_block($bc, $defaultregion);
}
/**
* Generate toc structure
*
* @param array $chapters
* @param stdClass $chapter
* @param stdClass $book
* @param stdClass $cm
* @param bool $edit
* @return string
*/
function book_get_toc($chapters, $chapter, $book, $cm, $edit) {
global $USER, $OUTPUT;
$toc = '';
$nch = 0; // Chapter number
$ns = 0; // Subchapter number
$first = 1;
$context = context_module::instance($cm->id);
$viewhidden = has_capability('mod/book:viewhiddenchapters', $context);
switch ($book->numbering) {
case BOOK_NUM_NONE:
$toc .= html_writer::start_tag('div', array('class' => 'book_toc_none clearfix'));
break;
case BOOK_NUM_NUMBERS:
$toc .= html_writer::start_tag('div', array('class' => 'book_toc_numbered clearfix'));
break;
case BOOK_NUM_BULLETS:
$toc .= html_writer::start_tag('div', array('class' => 'book_toc_bullets clearfix'));
break;
case BOOK_NUM_INDENTED:
$toc .= html_writer::start_tag('div', array('class' => 'book_toc_indented clearfix'));
break;
}
if ($edit) { // Editing on (Teacher's TOC).
$toc .= html_writer::start_tag('ul');
$i = 0;
foreach ($chapters as $ch) {
$i++;
$title = trim(format_string($ch->title, true, array('context' => $context)));
$titleunescaped = trim(format_string($ch->title, true, array('context' => $context, 'escape' => false)));
$titleout = $title;
if (!$ch->subchapter) {
if ($first) {
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
} else {
$toc .= html_writer::end_tag('ul');
$toc .= html_writer::end_tag('li');
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
}
if (!$ch->hidden) {
$nch++;
$ns = 0;
if ($book->numbering == BOOK_NUM_NUMBERS) {
$title = "$nch. $title";
$titleout = $title;
}
} else {
if ($book->numbering == BOOK_NUM_NUMBERS) {
$title = "x. $title";
}
$titleout = html_writer::tag('span', $title, array('class' => 'dimmed_text'));
}
} else {
if ($first) {
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
$toc .= html_writer::start_tag('ul');
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
} else {
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
}
if (!$ch->hidden) {
$ns++;
if ($book->numbering == BOOK_NUM_NUMBERS) {
$title = "$nch.$ns. $title";
$titleout = $title;
}
} else {
if ($book->numbering == BOOK_NUM_NUMBERS) {
if (empty($chapters[$ch->parent]->hidden)) {
$title = "$nch.x. $title";
} else {
$title = "x.x. $title";
}
}
$titleout = html_writer::tag('span', $title, array('class' => 'dimmed_text'));
}
}
if ($ch->id == $chapter->id) {
$toc .= html_writer::tag('strong', $titleout);
} else {
$toc .= html_writer::link(new moodle_url('view.php', array('id' => $cm->id, 'chapterid' => $ch->id)), $titleout,
array('title' => $titleunescaped));
}
$toc .= html_writer::start_tag('div', array('class' => 'action-list'));
if ($i != 1) {
$toc .= html_writer::link(new moodle_url('move.php', array('id' => $cm->id, 'chapterid' => $ch->id, 'up' => '1', 'sesskey' => $USER->sesskey)),
$OUTPUT->pix_icon('t/up', get_string('movechapterup', 'mod_book', $title)),
array('title' => get_string('movechapterup', 'mod_book', $titleunescaped)));
}
if ($i != count($chapters)) {
$toc .= html_writer::link(new moodle_url('move.php', array('id' => $cm->id, 'chapterid' => $ch->id, 'up' => '0', 'sesskey' => $USER->sesskey)),
$OUTPUT->pix_icon('t/down', get_string('movechapterdown', 'mod_book', $title)),
array('title' => get_string('movechapterdown', 'mod_book', $titleunescaped)));
}
$toc .= html_writer::link(new moodle_url('edit.php', array('cmid' => $cm->id, 'id' => $ch->id)),
$OUTPUT->pix_icon('t/edit', get_string('editchapter', 'mod_book', $title)),
array('title' => get_string('editchapter', 'mod_book', $titleunescaped)));
$deleteaction = new confirm_action(get_string('deletechapter', 'mod_book', $titleunescaped));
$toc .= $OUTPUT->action_icon(
new moodle_url('delete.php', [
'id' => $cm->id,
'chapterid' => $ch->id,
'sesskey' => sesskey(),
'confirm' => 1,
]),
new pix_icon('t/delete', get_string('deletechapter', 'mod_book', $title)),
$deleteaction,
['title' => get_string('deletechapter', 'mod_book', $titleunescaped)]
);
if ($ch->hidden) {
$toc .= html_writer::link(new moodle_url('show.php', array('id' => $cm->id, 'chapterid' => $ch->id, 'sesskey' => $USER->sesskey)),
$OUTPUT->pix_icon('t/show', get_string('showchapter', 'mod_book', $title)),
array('title' => get_string('showchapter', 'mod_book', $titleunescaped)));
} else {
$toc .= html_writer::link(new moodle_url('show.php', array('id' => $cm->id, 'chapterid' => $ch->id, 'sesskey' => $USER->sesskey)),
$OUTPUT->pix_icon('t/hide', get_string('hidechapter', 'mod_book', $title)),
array('title' => get_string('hidechapter', 'mod_book', $titleunescaped)));
}
$buttontitle = get_string('addafterchapter', 'mod_book', ['title' => $ch->title]);
$toc .= html_writer::link(new moodle_url('edit.php', array('cmid' => $cm->id, 'pagenum' => $ch->pagenum, 'subchapter' => $ch->subchapter)),
$OUTPUT->pix_icon('add', $buttontitle, 'mod_book'), array('title' => $buttontitle));
$toc .= html_writer::end_tag('div');
if (!$ch->subchapter) {
$toc .= html_writer::start_tag('ul');
} else {
$toc .= html_writer::end_tag('li');
}
$first = 0;
}
$toc .= html_writer::end_tag('ul');
$toc .= html_writer::end_tag('li');
$toc .= html_writer::end_tag('ul');
} else { // Editing off. Normal students, teachers view.
$toc .= html_writer::start_tag('ul');
foreach ($chapters as $ch) {
$title = trim(format_string($ch->title, true, array('context'=>$context)));
$titleunescaped = trim(format_string($ch->title, true, array('context' => $context, 'escape' => false)));
if (!$ch->hidden || ($ch->hidden && $viewhidden)) {
if (!$ch->subchapter) {
$nch++;
$ns = 0;
if ($first) {
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
} else {
$toc .= html_writer::end_tag('ul');
$toc .= html_writer::end_tag('li');
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
}
if ($book->numbering == BOOK_NUM_NUMBERS) {
$title = "$nch. $title";
}
} else {
$ns++;
if ($first) {
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
$toc .= html_writer::start_tag('ul');
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
} else {
$toc .= html_writer::start_tag('li', array('class' => 'clearfix'));
}
if ($book->numbering == BOOK_NUM_NUMBERS) {
$title = "$nch.$ns. $title";
}
}
$cssclass = ($ch->hidden && $viewhidden) ? 'dimmed_text' : '';
if ($ch->id == $chapter->id) {
$toc .= html_writer::tag('strong', $title, array('class' => $cssclass));
} else {
$toc .= html_writer::link(new moodle_url('view.php',
array('id' => $cm->id, 'chapterid' => $ch->id)),
$title, array('title' => s($titleunescaped), 'class' => $cssclass));
}
if (!$ch->subchapter) {
$toc .= html_writer::start_tag('ul');
} else {
$toc .= html_writer::end_tag('li');
}
$first = 0;
}
}
$toc .= html_writer::end_tag('ul');
$toc .= html_writer::end_tag('li');
$toc .= html_writer::end_tag('ul');
}
$toc .= html_writer::end_tag('div');
$toc = str_replace('<ul></ul>', '', $toc); // Cleanup of invalid structures.
return $toc;
}
/**
* Returns book chapters tagged with a specified tag.
*
* This is a callback used by the tag area mod_book/book_chapters to search for book chapters
* tagged with a specific tag.
*
* @param core_tag_tag $tag
* @param bool $exclusivemode if set to true it means that no other entities tagged with this tag
* are displayed on the page and the per-page limit may be bigger
* @param int $fromctx context id where the link was displayed, may be used by callbacks
* to display items in the same context first
* @param int $ctx context id where to search for records
* @param bool $rec search in subcontexts as well
* @param int $page 0-based number of page being displayed
* @return \core_tag\output\tagindex
*/
function mod_book_get_tagged_chapters($tag, $exclusivemode = false, $fromctx = 0, $ctx = 0, $rec = true, $page = 0) {
global $OUTPUT;
$perpage = $exclusivemode ? 20 : 5;
// Build the SQL query.
$ctxselect = context_helper::get_preload_record_columns_sql('ctx');
$query = "SELECT bc.id, bc.title, bc.bookid, bc.hidden,
cm.id AS cmid, c.id AS courseid, c.shortname, c.fullname, $ctxselect
FROM {book_chapters} bc
JOIN {book} b ON b.id = bc.bookid
JOIN {modules} m ON m.name='book'
JOIN {course_modules} cm ON cm.module = m.id AND cm.instance = b.id
JOIN {tag_instance} tt ON bc.id = tt.itemid
JOIN {course} c ON cm.course = c.id
JOIN {context} ctx ON ctx.instanceid = cm.id AND ctx.contextlevel = :coursemodulecontextlevel
WHERE tt.itemtype = :itemtype AND tt.tagid = :tagid AND tt.component = :component
AND cm.deletioninprogress = 0
AND bc.id %ITEMFILTER% AND c.id %COURSEFILTER%";
$params = array('itemtype' => 'book_chapters', 'tagid' => $tag->id, 'component' => 'mod_book',
'coursemodulecontextlevel' => CONTEXT_MODULE);
if ($ctx) {
$context = $ctx ? context::instance_by_id($ctx) : context_system::instance();
$query .= $rec ? ' AND (ctx.id = :contextid OR ctx.path LIKE :path)' : ' AND ctx.id = :contextid';
$params['contextid'] = $context->id;
$params['path'] = $context->path.'/%';
}
$query .= " ORDER BY ";
if ($fromctx) {
// In order-clause specify that modules from inside "fromctx" context should be returned first.
$fromcontext = context::instance_by_id($fromctx);
$query .= ' (CASE WHEN ctx.id = :fromcontextid OR ctx.path LIKE :frompath THEN 0 ELSE 1 END),';
$params['fromcontextid'] = $fromcontext->id;
$params['frompath'] = $fromcontext->path.'/%';
}
$query .= ' c.sortorder, cm.id, bc.id';
$totalpages = $page + 1;
// Use core_tag_index_builder to build and filter the list of items.
$builder = new core_tag_index_builder('mod_book', 'book_chapters', $query, $params, $page * $perpage, $perpage + 1);
while ($item = $builder->has_item_that_needs_access_check()) {
context_helper::preload_from_record($item);
$courseid = $item->courseid;
if (!$builder->can_access_course($courseid)) {
$builder->set_accessible($item, false);
continue;
}
$modinfo = get_fast_modinfo($builder->get_course($courseid));
// Set accessibility of this item and all other items in the same course.
$builder->walk(function ($taggeditem) use ($courseid, $modinfo, $builder) {
if ($taggeditem->courseid == $courseid) {
$accessible = false;
if (($cm = $modinfo->get_cm($taggeditem->cmid)) && $cm->uservisible) {
if (empty($taggeditem->hidden)) {
$accessible = true;
} else {
$accessible = has_capability('mod/book:viewhiddenchapters', context_module::instance($cm->id));
}
}
$builder->set_accessible($taggeditem, $accessible);
}
});
}
$items = $builder->get_items();
if (count($items) > $perpage) {
$totalpages = $page + 2; // We don't need exact page count, just indicate that the next page exists.
array_pop($items);
}
// Build the display contents.
if ($items) {
$tagfeed = new core_tag\output\tagfeed();
foreach ($items as $item) {
context_helper::preload_from_record($item);
$modinfo = get_fast_modinfo($item->courseid);
$cm = $modinfo->get_cm($item->cmid);
$pageurl = new moodle_url('/mod/book/view.php', array('chapterid' => $item->id, 'b' => $item->bookid));
$pagename = format_string($item->title, true, array('context' => context_module::instance($item->cmid)));
$pagename = html_writer::link($pageurl, $pagename);
$courseurl = course_get_url($item->courseid, $cm->sectionnum);
$cmname = html_writer::link($cm->url, $cm->get_formatted_name());
$coursename = format_string($item->fullname, true, array('context' => context_course::instance($item->courseid)));
$coursename = html_writer::link($courseurl, $coursename);
$icon = html_writer::link($pageurl, html_writer::empty_tag('img', array('src' => $cm->get_icon_url())));
$tagfeed->add($icon, $pagename, $cmname.'<br>'.$coursename);
}
$content = $OUTPUT->render_from_template('core_tag/tagfeed',
$tagfeed->export_for_template($OUTPUT));
return new core_tag\output\tagindex($tag, 'mod_book', 'book_chapters', $content,
$exclusivemode, $fromctx, $ctx, $rec, $page, $totalpages);
}
}
/**
* File browsing support class
*
* @copyright 2010-2011 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class book_file_info extends file_info {
/** @var stdClass Course object */
protected $course;
/** @var stdClass Course module object */
protected $cm;
/** @var array Available file areas */
protected $areas;
/** @var string File area to browse */
protected $filearea;
/**
* Constructor
*
* @param file_browser $browser file_browser instance
* @param stdClass $course course object
* @param stdClass $cm course module object
* @param stdClass $context module context
* @param array $areas available file areas
* @param string $filearea file area to browse
*/
public function __construct($browser, $course, $cm, $context, $areas, $filearea) {
parent::__construct($browser, $context);
$this->course = $course;
$this->cm = $cm;
$this->areas = $areas;
$this->filearea = $filearea;
}
/**
* Returns list of standard virtual file/directory identification.
* The difference from stored_file parameters is that null values
* are allowed in all fields
* @return array with keys contextid, filearea, itemid, filepath and filename
*/
public function get_params() {
return array('contextid'=>$this->context->id,
'component'=>'mod_book',
'filearea' =>$this->filearea,
'itemid' =>null,
'filepath' =>null,
'filename' =>null);
}
/**
* Returns localised visible name.
* @return string
*/
public function get_visible_name() {
return $this->areas[$this->filearea];
}
/**
* Can I add new files or directories?
* @return bool
*/
public function is_writable() {
return false;
}
/**
* Is directory?
* @return bool
*/
public function is_directory() {
return true;
}
/**
* Returns list of children.
* @return array of file_info instances
*/
public function get_children() {
return $this->get_filtered_children('*', false, true);
}
/**
* Help function to return files matching extensions or their count
*
* @param string|array $extensions, either '*' or array of lowercase extensions, i.e. array('.gif','.jpg')
* @param bool|int $countonly if false returns the children, if an int returns just the
* count of children but stops counting when $countonly number of children is reached
* @param bool $returnemptyfolders if true returns items that don't have matching files inside
* @return array|int array of file_info instances or the count
*/
private function get_filtered_children($extensions = '*', $countonly = false, $returnemptyfolders = false) {
global $DB;
$params = array('contextid' => $this->context->id,
'component' => 'mod_book',
'filearea' => $this->filearea,
'bookid' => $this->cm->instance);
$sql = 'SELECT DISTINCT bc.id, bc.pagenum
FROM {files} f, {book_chapters} bc
WHERE f.contextid = :contextid
AND f.component = :component
AND f.filearea = :filearea
AND bc.bookid = :bookid
AND bc.id = f.itemid';
if (!$returnemptyfolders) {
$sql .= ' AND filename <> :emptyfilename';
$params['emptyfilename'] = '.';
}
list($sql2, $params2) = $this->build_search_files_sql($extensions, 'f');
$sql .= ' '.$sql2;
$params = array_merge($params, $params2);
if ($countonly === false) {
$sql .= ' ORDER BY bc.pagenum';
}
$rs = $DB->get_recordset_sql($sql, $params);
$children = array();
foreach ($rs as $record) {
if ($child = $this->browser->get_file_info($this->context, 'mod_book', $this->filearea, $record->id)) {
if ($returnemptyfolders || $child->count_non_empty_children($extensions)) {
$children[] = $child;
}
}
if ($countonly !== false && count($children) >= $countonly) {
break;
}
}
$rs->close();
if ($countonly !== false) {
return count($children);
}
return $children;
}
/**
* Returns list of children which are either files matching the specified extensions
* or folders that contain at least one such file.
*
* @param string|array $extensions, either '*' or array of lowercase extensions, i.e. array('.gif','.jpg')
* @return array of file_info instances
*/
public function get_non_empty_children($extensions = '*') {
return $this->get_filtered_children($extensions, false);
}
/**
* Returns the number of children which are either files matching the specified extensions
* or folders containing at least one such file.
*
* @param string|array $extensions, for example '*' or array('.gif','.jpg')
* @param int $limit stop counting after at least $limit non-empty children are found
* @return int
*/
public function count_non_empty_children($extensions = '*', $limit = 1) {
return $this->get_filtered_children($extensions, $limit);
}
/**
* Returns parent file_info instance
* @return file_info or null for root
*/
public function get_parent() {
return $this->browser->get_file_info($this->context);
}
}