Builder.php

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<?php

namespace Rsi\Fred\Controller\View\Html;

class Builder extends \Rsi\Thing{

  const RENDER_CAPTION = '~'; //!< ID prefix indicating to render only the caption.
  const RENDER_WIDGET = '$'; //!< ID prefix indicating to render only the widget.
  const RENDER_BOTH = '%'; //!< ID prefix indicating to render both caption and widget (explicitly).
  const RENDER_WILD = '*'; //!< Render all (between previous and next id).

  protected $_view;

  public function __construct($view){
    $this->_view = $view;
  }
  /**
   * Add a row.
   * @param array $ids  Current set of widget ID's.
   * @param array $row  Widget ID's for the row.
   * @param string $index  Position to insert the row (before; empty to add on end).
   * @return array  Widget ID's with the row added (duplicate ID's are removed from the original set).
   */
  public static function row($ids,$row,$index = null){
    $result = [];
    foreach($ids as $id){
      if($id == $index){
        $result[] = $row;
        $index = false;
      }
      if(is_array($id) || !in_array($id,$row)) $result[] = $id;
    }
    if($index !== false) $result[] = $row;
    return $result;
  }

  protected function trim($id){
    return ltrim($id,self::RENDER_CAPTION . self::RENDER_WIDGET . self::RENDER_BOTH);
  }

  protected function next($ids){
    while($id = array_shift($ids)){
      if(is_array($id)) $id = $this->next($id);
      if($id && ($id != self::RENDER_WILD)) return $id;
    }
    return null;
  }

  protected function expand($ids,&$done = []){
    $result = [];
    while($id = array_shift($ids))
      if(is_array($id)) $result[] = $this->expand($id,$done);
      elseif($id == self::RENDER_WILD){
        $todo = array_diff($this->_view->notRenderedWidgetIds(),$done);
        $next = $this->trim($this->next($ids));
        while(($id = array_shift($todo)) && ($id != $next)) $done[] = $this->trim($result[] = $id);
      }
      else $done[] = $this->trim($result[] = $id);
    return $result;
  }

  protected function renderCaption($id){
    return substr($id,0,1) == self::RENDER_WIDGET ? null : $this->_view->widget($this->trim($id))->renderCaption();
  }

  protected function renderWidget($id){
    return substr($id,0,1) == self::RENDER_CAPTION ? null : $this->_view->renderWidget($this->trim($id));
  }

  public function build($ids){
    $content = '';
    foreach($this->expand($ids) as $id) $content .= is_array($id)
      ? $this->html->div($this->build($id),null,'fred-sub ids-' . implode($id))
      : $this->html->div($this->renderCaption($id) . $this->renderWidget($id),null,'fred-row id-' . $id);
    return $content;
  }

  protected function getHtml(){
    return $this->_view->component('html');
  }

}