C:/xampp/htdocs/moodle/admin/tool/xmldb/actions/generate_documentation/generate_documentation.class.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/>.

class generate_documentation extends XMLDBAction {

    function init() {
        parent::init();

        // Set own custom attributes
        $this->sesskey_protected = false; // This action doesn't need sesskey protection

        // Get needed strings
        $this->loadStrings(array(
            'backtomainview' => 'tool_xmldb',
            'documentationintro' => 'tool_xmldb'
        ));
    }

    function invoke() {
        parent::invoke();

        $result = true;

        // Set own core attributes
        $this->does_generate = ACTION_GENERATE_HTML;

        // These are always here
        global $CFG, $XMLDB;

        // Do the job, setting $result as needed

        // Get the dir containing the file
        $dirpath = required_param('dir', PARAM_PATH);
        $dirpath = $CFG->dirroot . $dirpath;
        $path = $dirpath.'/install.xml';
        if(!file_exists($path) || !is_readable($path)) {
            return false;
        }

        // Add link back to home
        $b = ' <p class="centerpara buttons">';
        $b .= '&nbsp;<a href="index.php?action=main_view#lastused">[' . $this->str['backtomainview'] . ']</a>';
        $b .= '</p>';
        $this->output=$b;

        $c = ' <p class="centerpara">';
        $c .= $this->str['documentationintro'];
        $c .= '</p>';
        $this->output.=$c;

        if(class_exists('XSLTProcessor')) {
            // Transform XML file and display it
            $doc = new DOMDocument();
            $xsl = new XSLTProcessor();

            $doc->load(dirname(__FILE__).'/xmldb.xsl');
            $xsl->importStyleSheet($doc);

            $doc->load($path);
            $this->output.=$xsl->transformToXML($doc);
            $this->output.=$b;
        } else {
            $this->output.=get_string('extensionrequired','tool_xmldb','xsl');
        }

        // Launch postaction if exists (leave this unmodified)
        if ($this->getPostAction() && $result) {
            return $this->launch($this->getPostAction());
        }

        return $result;
    }
}