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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/>.
/**
* Functions used by the health tool.
*
* @package tool_health
* @copyright 2013 Marko Vidberg
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Given a list of categories, this function searches for ones
* that have a missing parent category.
*
* @param array $categories List of categories.
* @return array List of categories with missing parents.
*/
function tool_health_category_find_missing_parents($categories) {
$missingparent = array();
foreach ($categories as $category) {
if ($category->parent != 0 && !array_key_exists($category->parent, $categories)) {
$missingparent[$category->id] = $category;
}
}
return $missingparent;
}
/**
* Generates a list of categories with missing parents.
*
* @param array $missingparent List of categories with missing parents.
* @return string Bullet point list of categories with missing parents.
*/
function tool_health_category_list_missing_parents($missingparent) {
$description = '';
if (!empty($missingparent)) {
$description .= '<p>The following categories are missing their parents:</p><ul>';
foreach ($missingparent as $cat) {
$description .= "<li>Category $cat->id: " . s($cat->name) . "</li>\n";
}
$description .= "</ul>\n";
}
return $description;
}
/**
* Given a list of categories, this function searches for ones
* that have loops to previous parent categories.
*
* @param array $categories List of categories.
* @return array List of categories with loops.
*/
function tool_health_category_find_loops($categories) {
$loops = array();
while (!empty($categories)) {
$current = array_pop($categories);
$thisloop = array($current->id => $current);
while (true) {
if (isset($thisloop[$current->parent])) {
// Loop detected.
$loops = $loops + $thisloop;
break;
} else if ($current->parent === 0) {
// Top level.
break;
} else if (isset($loops[$current->parent])) {
// If the parent is in a loop we should also update this category.
$loops = $loops + $thisloop;
break;
} else if (!isset($categories[$current->parent])) {
// We already checked this category and is correct.
break;
} else {
// Continue following the path.
$current = $categories[$current->parent];
$thisloop[$current->id] = $current;
unset($categories[$current->id]);
}
}
}
return $loops;
}
/**
* Generates a list of categories with loops.
*
* @param array $loops List of categories with loops.
* @return string Bullet point list of categories with loops.
*/
function tool_health_category_list_loops($loops) {
$description = '';
if (!empty($loops)) {
$description .= '<p>The following categories form a loop of parents:</p><ul>';
foreach ($loops as $loop) {
$description .= "<li>\n";
$description .= "Category $loop->id: " . s($loop->name) . " has parent $loop->parent\n";
$description .= "</li>\n";
}
$description .= "</ul>\n";
}
return $description;
}