<?php
namespace structures\html;
class Script extends Element
{
   public function __construct($src=null)
   {
      parent::__construct("script");
      $this->add_attribute("src", $src);
   }
}

<?php
namespace structures\html;

class Head extends Element
{
   public function __construct(
      $title=null, $css_path=null, $description=null, $favicon_path=null,
      $thumbnail_path=null)
   {
      parent::__construct("head");
      $this->title = $title;
      $this->css_path = $css_path;
      $this->description = $description;
      $this->favicon_path = $favicon_path;
      $this->thumbnail_path = $thumbnail_path;
   }
   protected function build_content()
   {
      $markup = $this->build_title();
      $markup .= $this->build_css_link();
      $markup .= $this->build_description();
      $markup .= $this->build_favicon_link();
      $markup .= $this->build_thumbnail_link();
      return $markup;
   }
   protected function build_title()
   {
      $title = $this->title;
      if (!is_null($title))
      {
         return new Title($this->title);
      }
      return null;
   }
   protected function build_css_link()
   {
      $path = $this->css_path;
      if (!is_null($path))
      {
         return new Link("stylesheet", $path);
      }
      return null;
   }
   protected function build_description()
   {
      $description = $this->description;
      if (!is_null($description))
      {
         return new Meta($description, "description");
      }
      return null;
   }
   protected function build_favicon_link()
   {
      $path = $this->favicon_path;
      if (!is_null($path))
      {
         return new Link("shortcut icon", $path);
      }
      return null;
   }
   protected function build_thumbnail_link()
   {
      $path = $this->thumbnail_path;
      if (!is_null($path))
      {
         return new Link("image_src", $path);
      }
      return null;
   }
}

<?php
namespace structures\html;

class Table extends Element
{
   public function __construct($id=null, $class=null, $cellspacing=0)
   {
      parent::__construct("table", $id, $class);
      $this->add_attribute("cellspacing", $cellspacing);
   }
}

<?php
namespace structures\html;

class A extends Element
{
   public function __construct($href=null, $content=null, $id=null, $class=null)
   {
      parent::__construct("a", $id, $class);
      $this->add_attribute("href", $href);
      $this->content = $content;
   }

   protected function build_content()
   {
      $content = $this->content;
      if (is_null($content))
      {
         $content = $this->get_attribute("href");
      }
      return $content;
   }
}

<?php
namespace structures\html;

class HTML extends Element
{
   public function __construct(
      $title=null, $css_path=null, $description=null, $favicon_path=null,
      $thumbnail_path=null)
   {
      parent::__construct("html");
      $this->title = $this->get_default($title, "PAGE_TITLE");
      $this->css_path = $this->get_default($css_path, "CSS_PATH");
      $this->description = $description;
      $this->favicon_path = $favicon_path;
      $this->thumbnail_path = $thumbnail_path;
   }
   protected function build_content()
   {
      $markup = $this->build_head();
      $markup .= new Body($this->build_body());
      return $markup;
   }
   protected function build_head()
   {
      return new Head(
         $this->title, $this->css_path, $this->description,
         $this->favicon_path, $this->thumbnail_path);
   }
   protected function build_body()
   {
      return null;
   }
}

<?php
namespace structures\html;

class Td extends Element
{
   public function __construct(
      $content=null, $id=null, $class=null, $colspan=null, $rowspan=null)
   {
      parent::__construct("td", $id, $class);
      $this->content = $content;
      $this->add_attribute("colspan", $colspan);
      $this->add_attribute("rowspan", $rowspan);
   }
   protected function build_content()
   {
      return $this->content;
   }
}

<?php
namespace structures\html;

class IFrame extends Element
{
   public function __construct($id, $src, $width, $height)
   {
      parent::__construct("iframe", $id);
      $this->add_attribute("src", $src);
      $this->add_attribute("width", $width);
      $this->add_attribute("height", $height);
      $this->add_attribute("frameborder", "0");
   }
}

<?php
namespace structures\html;

class Body extends Element
{
   public function __construct($content)
   {
      parent::__construct("body");
      $this->content = $content;
   }
   protected function build_content()
   {
      return $this->content . $this->break_line();
   }
}