fixate/pw-mvc-boilerplate

<?php

use fixate as f8;
use ProcessWire as PW;

trait Javascript
{
  public static function __jsInitialize($obj)
  {
    $obj->helper('js_add_vendor');
    $obj->helper('js_add_script');
    $obj->helper('js_add_cdn');
    $obj->helper('render_scripts');
    $obj->helper('render_js_data');
  }

  private $__js_scripts = array();

  public function js_add_vendor($vendor)
  {
    if ($main = $this->__load_bower_main($vendor)) {
      if (is_array($main)) {
        $main = $this->__get_script_path($main);
      }

      $path = "vendor/%%/{$main}";
    } else {
      $path = 'vendor/%%/%%';
    }

    $this->__js_scripts[] = array('vendor', $vendor, $path, null);
  }

  public function js_add_script($script, $path_tmpl = 'js/%%')
  {
    $this->__js_scripts[] = array('user', $script, $path_tmpl, null);
  }

  public function js_add_cdn($url, $detect = false, $fallback = false)
  {
    $this->__js_scripts[] = array('cdn', null, null, $url, array($detect, $fallback));
  }

  public function render_scripts()
  {
    $html = '';
    foreach ($this->__js_scripts as $script) {
      list($type, $script_name, $script_path, $url) = $script;
      switch ($type) {
        case 'user':
        case 'vendor':
          $path = str_replace('%%', $script_name, $script_path);
          $has_ext = f8\Paths::get_extension($path) == 'js';
          if (!$has_ext) {
            $path = f8\Paths::change_extension($path, 'js');
          }
          $path = $this->view->assets($path);
          $html .= $this->__script_tag($path);
          break;
        case 'cdn':
          $html .= $this->__cdn_tag($url, array_pop($script));
          break;
      }
    }

    return $html;
  }

  public function render_js_data()
  {
    $page = $this->page;

    return '<script>window.processWire = ' . PW\wireEncodeJSON(array(
      'page' => $page->name,
      'template' => $page->template->name,
    )) . '</script>';
  }

  private function __cdn_tag($url, $fallback = false)
  {
    $html = $this->__script_tag($url);
    if ($fallback) {
      list($detect, $asset) = $fallback;
      $asset = $this->view->assets($asset);
      $html .= "<script>({$detect}) || document.write('<script src=\"{$asset}\">\\x3C/script>')</script>";
    }

    return $html;
  }

  private function __load_bower_main($vendor)
  {
    $tries = array('.bower.json', 'bower.json', 'component.json');

    foreach ($tries as $t) {
      $file = f8\Paths::join(TEMPLATE_DIR, "assets/vendor/{$vendor}/{$t}");
      if (file_exists($file)) {
        $manifest = json_decode(file_get_contents($file), true);
        if (array_key_exists('main', $manifest)) {
          return $manifest['main'];
        }
      }
    }

    return;
  }

  private function __script_tag($src)
  {
    return "<scripe src='{$src}'></script>";
  }

  private function __get_script_path($array)
  {
    $i = 0;

    foreach ($array as $path) {
      if (f8\Paths::get_extension($path) === 'js') {
        return $array[$i];
      }
      ++$i;
    }

    return;
  }
}