<?php
/**
 * This program 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; under version 2
 * of the License (non-upgradable).
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2008-2010 (original work) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
 *               2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
 *
 */

/**
 * The StructureExtractor extracts translation units from structures.xml files.
 *
 * Some extracted translation units will be given a 'tao-public' flag. This flag indicates
 * that the translation unit has to be included in every compiled messages.po file.
 *
 * @access public
 * @author firstname and lastname of author, <author@example.org>
 * @package tao

 */
class tao_helpers_translation_StructureExtractor extends tao_helpers_translation_TranslationExtractor
{

    /**
     * Extracts the translation units from a structures.xml file.
     * Translation Units can be retrieved after extraction by calling the getTranslationUnits
     * method.
     *
     * @access public
     * @author Jerome Bogaerts <jerome@taotesting.com>
     * @throws tao_helpers_translation_TranslationException If an error occurs.
     */
    public function extract()
    {
        $translationUnits = [];
        
        foreach ($this->getPaths() as $file) {
            $xml = new \SimpleXMLElement($file, null, true);
            if ($xml instanceof SimpleXMLElement) {
                // look up for "name" attributes of structure elements.
                $nodes = $xml->xpath("//structure[@name]|//section[@name]");
                foreach ($nodes as $node) {
                    if (isset($node['name'])) {
                        $nodeName = (string)$node['name'];
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource($nodeName);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[$nodeName] = $newTranslationUnit;
                    }
                }
                
                // look up for "name" attributes of action elements.
                $nodes = $xml->xpath("//action[@name]|//tree[@name]");
                foreach ($nodes as $node) {
                    if (isset($node['name'])) {
                        $nodeName = (string)$node['name'];
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource($nodeName);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[$nodeName] = $newTranslationUnit;
                    }
                }
                
                // look up for "description" elements.
                $nodes = $xml->xpath("//description");
                foreach ($nodes as $node) {
                    if ((string)$node != '') {
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource((string)$node);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[(string)$node] = $newTranslationUnit;
                    }
                }
                
                // look up for "action" elements inside a toolbar
                $nodes = $xml->xpath("//toolbar/toolbaraction");
                foreach ($nodes as $node) {
                    $nodeValue = (string)$node;
                    if (trim($nodeValue) != '' && !array_key_exists($nodeValue, $translationUnits)) {
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource($nodeValue);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[$nodeValue] = $newTranslationUnit;
                    }
                }
                
                // look up for the "title" attr of an "action" element inside a toolbar
                $nodes = $xml->xpath("//toolbar/toolbaraction[@title]");
                foreach ($nodes as $node) {
                    if (isset($node['title'])) {
                        $nodeTitle = (string)$node['title'];
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource($nodeTitle);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[$nodeTitle] = $newTranslationUnit;
                    }
                }
                
                // look up for the "entrypoint" elements
                $nodes = $xml->xpath("//entrypoint");
                foreach ($nodes as $node) {
                    if (isset($node['title'])) {
                        $nodeTitle = (string)$node['title'];
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource($nodeTitle);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[$nodeTitle] = $newTranslationUnit;
                    }
                    if (isset($node['label'])) {
                        $nodeLabel = (string)$node['label'];
                        $newTranslationUnit = new tao_helpers_translation_POTranslationUnit();
                        $newTranslationUnit->setSource($nodeLabel);
                        $newTranslationUnit->addFlag('tao-public');
                        $translationUnits[$nodeTitle] = $newTranslationUnit;
                    }
                }
            }
        }
        
        $this->setTranslationUnits(array_values($translationUnits));
    }
}