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   1  <?php
   2  
   3  /**
   4   * This file is part of the POMO package.
   5   */
   6  
   7  namespace POMO\Streams;
   8  
   9      /**
  10       * Provides file-like methods for manipulating a string instead
  11       * of a physical file.
  12       */
  13  class StringReader extends Reader implements StreamInterface
  14  {
  15      public $_str = '';
  16  
  17      public function __construct($str = '')
  18      {
  19          parent::__construct();
  20          $this->_str = $str;
  21          $this->_pos = 0;
  22      }
  23  
  24      /**
  25       * @param string $bytes
  26       * @return string
  27       */
  28      public function read($bytes)
  29      {
  30          $data        = $this->substr($this->_str, $this->_pos, $bytes);
  31          $this->_pos += $bytes;
  32          if ($this->strlen($this->_str) < $this->_pos) {
  33              $this->_pos = $this->strlen($this->_str);
  34          }
  35          return $data;
  36      }
  37  
  38      /**
  39       * @param int $pos
  40       * @return int
  41       */
  42      public function seekto($pos)
  43      {
  44          $this->_pos = $pos;
  45          if ($this->strlen($this->_str) < $this->_pos) {
  46              $this->_pos = $this->strlen($this->_str);
  47          }
  48          return $this->_pos;
  49      }
  50  
  51      /**
  52       * @return int
  53       */
  54      public function length()
  55      {
  56          return $this->strlen($this->_str);
  57      }
  58  
  59      /**
  60       * @return string
  61       */
  62      public function read_all()
  63      {
  64          return $this->substr($this->_str, $this->_pos, $this->strlen($this->_str));
  65      }
  66  }