<?php
  
  namespace Sabre\VObject\Splitter;
  
  use Sabre\VObject;
  
  /**
   * Splitter
   *
   * This class is responsible for splitting up VCard objects.
   *
   * It is assumed that the input stream contains 1 or more VCARD objects. This
   * class checks for BEGIN:VCARD and END:VCARD and parses each encountered
   * component individually.
   *
   * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
   * @author Dominik Tobschall
   * @author Armin Hackmann
   * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
   */
  class VCard implements SplitterInterface {
  
      /**
       * File handle
       *
       * @var resource
       */
      protected $input;
  
      /**
       * Constructor
       *
       * The splitter should receive an readable file stream as it's input.
       *
       * @param resource $input
       */
      public function __construct($input) {
  
          $this->input = $input;
  
      }
  
      /**
       * Every time getNext() is called, a new object will be parsed, until we
       * hit the end of the stream.
       *
       * When the end is reached, null will be returned.
       *
       * @return Sabre\VObject\Component|null
       */
      public function getNext() {
  
          $vcard = '';
  
          do {
  
              if (feof($this->input)) {
                  return false;
              }
  
              $line = fgets($this->input);
              $vcard .= $line;
  
          } while(strtoupper(substr($line,0,4))!=="END:");
  
          $object = VObject\Reader::read($vcard);
  
          if($object->name !== 'VCARD') {
              throw new \InvalidArgumentException("Thats no vCard!", 1);
          }
  
          return $object;
  
      }
  
  }