drupal-civicrm/sites/all/modules/civicrm/CRM/Extension/Info.php

<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.7                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2017                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM 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 Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
 */

/**
 * Metadata for an extension (e.g. the extension's "info.xml" file)
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2017
 */
class CRM_Extension_Info {

  /**
   * Extension info file name.
   */
  const FILENAME = 'info.xml';

  public $key = NULL;
  public $type = NULL;
  public $name = NULL;
  public $label = NULL;
  public $file = NULL;

  /**
   * @var array
   *   Each item is a specification like:
   *   array('type'=>'psr4', 'namespace'=>'Foo\Bar', 'path'=>'/foo/bar').
   */
  public $classloader = array();

  /**
   * @var array
   *   Each item is they key-name of an extension required by this extension.
   */
  public $requires = array();

  /**
   * Load extension info an XML file.
   *
   * @param $file
   *
   * @throws CRM_Extension_Exception_ParseException
   * @return CRM_Extension_Info
   */
  public static function loadFromFile($file) {
    list ($xml, $error) = CRM_Utils_XML::parseFile($file);
    if ($xml === FALSE) {
      throw new CRM_Extension_Exception_ParseException("Failed to parse info XML: $error");
    }

    $instance = new CRM_Extension_Info();
    $instance->parse($xml);
    return $instance;
  }

  /**
   * Load extension info a string.
   *
   * @param string $string
   *   XML content.
   *
   * @throws CRM_Extension_Exception_ParseException
   * @return CRM_Extension_Info
   */
  public static function loadFromString($string) {
    list ($xml, $error) = CRM_Utils_XML::parseString($string);
    if ($xml === FALSE) {
      throw new CRM_Extension_Exception_ParseException("Failed to parse info XML: $string");
    }

    $instance = new CRM_Extension_Info();
    $instance->parse($xml);
    return $instance;
  }

  /**
   * Build a reverse-dependency map.
   *
   * @param array $infos
   *   The universe of available extensions.
   *   Ex: $infos['org.civicrm.foobar'] = new CRM_Extension_Info().
   * @return array
   *   If "org.civicrm.api" is required by "org.civicrm.foo", then return
   *   array('org.civicrm.api' => array(CRM_Extension_Info[org.civicrm.foo])).
   *   Array(string $key => array $requiredBys).
   */
  public static function buildReverseMap($infos) {
    $revMap = array();
    foreach ($infos as $info) {
      foreach ($info->requires as $key) {
        $revMap[$key][] = $info;
      }
    }
    return $revMap;
  }

  /**
   * @param null $key
   * @param null $type
   * @param null $name
   * @param null $label
   * @param null $file
   */
  public function __construct($key = NULL, $type = NULL, $name = NULL, $label = NULL, $file = NULL) {
    $this->key = $key;
    $this->type = $type;
    $this->name = $name;
    $this->label = $label;
    $this->file = $file;
  }

  /**
   * Copy attributes from an XML document to $this
   *
   * @param SimpleXMLElement $info
   */
  public function parse($info) {
    $this->key = (string) $info->attributes()->key;
    $this->type = (string) $info->attributes()->type;
    $this->file = (string) $info->file;
    $this->label = (string) $info->name;

    // Convert first level variables to CRM_Core_Extension properties
    // and deeper into arrays. An exception for URLS section, since
    // we want them in special format.
    foreach ($info as $attr => $val) {
      if (count($val->children()) == 0) {
        $this->$attr = (string) $val;
      }
      elseif ($attr === 'urls') {
        $this->urls = array();
        foreach ($val->url as $url) {
          $urlAttr = (string) $url->attributes()->desc;
          $this->urls[$urlAttr] = (string) $url;
        }
        ksort($this->urls);
      }
      elseif ($attr === 'classloader') {
        $this->classloader = array();
        foreach ($val->psr4 as $psr4) {
          $this->classloader[] = array(
            'type' => 'psr4',
            'prefix' => (string) $psr4->attributes()->prefix,
            'path' => (string) $psr4->attributes()->path,
          );
        }
      }
      elseif ($attr === 'requires') {
        $this->requires = array();
        foreach ($val->ext as $ext) {
          $this->requires[] = (string) $ext;
        }
      }
      else {
        $this->$attr = CRM_Utils_XML::xmlObjToArray($val);
      }
    }
  }

}