inheritance_depth.php

<?php

require './tests/bootstrap.php';
function lib_files() {
  $module_roots = array();
  foreach (scandir('./modules') as $module) {
    if (!in_array($module, array('.', '..')) && is_dir("./modules/$module")) {
      $module_roots[$module] = "./modules/$module/lib";
    }
  }

  $core_root = './lib';
  $lib_files = array_filter(array_map(function ($dir) {
    if (is_dir($dir)) {
      $all_files = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir));
      $files = array_filter(array_map(function($file) {
        return $file->getExtension() === 'php' ? $file->getPathname() : NULL;
      }, iterator_to_array($all_files, false)));
      return $files;
    }
  }, $module_roots + array($core_root)));
  return call_user_func_array('array_merge', $lib_files);
}

function get_parent($classname) {
  try {
    $class = new \ReflectionClass($classname);
    $parent = $class->getParentClass();

    if (!$parent) return FALSE;

    return $parent->getName();
  }
  catch (ReflectionException $e) {
    return FALSE;
  }
}

function get_inheritance_chain($classname) {
  $parents = array();

  $parent = get_parent($classname);
  while ($parent) {
    $parents[] = $parent;
    $parent = get_parent($parent);
  }
  return $parents;
}

function files_to_classes($files) {
  return array_filter(array_map(function ($file) {
    if (strpos($file, '/Tests/') !== false) return false;
    if (strpos($file, 'Simpletest') !== false) return false;
    if (strpos($file, 'simpletest') !== false) return false;
    list($loader_root, $filename) = explode('lib', $file);
    return str_replace('.php', '', str_replace('/', '\\', $filename));
  }, $files));
}

$files = lib_files();
$classes = files_to_classes($files);
$inheritence_chain = array();

foreach ($classes as $class) {
  $inheritence_chain[$class] = get_inheritance_chain($class);
}

$rows = array(array('class', 'furthest_parent', 'depth'));
foreach ($inheritence_chain as $class => $parents) {
  $rows[] = array($class, end($parents), count($parents));
}

$csv = array_map(function($row) { return implode(',', $row);}, $rows);
file_put_contents(getenv('HOME') . '/d8_inheritence_depth.csv', implode("\n", $csv));