# StringReader.class.php

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    00001 <?php
    00002 /***************************************************************************
    00003  *   Copyright (C) 2007 by Dmitry A. Lomash                                *
    00004  *                                                                         *
    00005  *   This program is free software; you can redistribute it and/or modify  *
    00006  *   it under the terms of the GNU Lesser General Public License as        *
    00007  *   published by the Free Software Foundation; either version 3 of the    *
    00008  *   License, or (at your option) any later version.                       *
    00009  *                                                                         *
    00010  ***************************************************************************/
    00011
    00015     final class StringReader extends Reader
    00016     {
    00017         private $string     = null;
    00018         private $length     = null;
    00019
    00020         private $next       = 0;
    00021         private $mark       = 0;
    00022
    00026         public static function create($string)
    00027         {
    00028             return new self($string);
    00029         }
    00030
    00031         public function __construct($string)
    00032         {
    00033             $this->string = $string;
    00034             $this->length = mb_strlen($this->string);
    00035         }
    00036
    00040         public function close()
    00041         {
    00042             $this->string = null;
    00043
    00044             return $this;
    00045         }
    00046
    00047         public function read($count)
    00048         {
    00049             $this->ensureOpen();
    00050
    00051             if ($this->next >= $this->length)
    00052                 return null;
    00053
    00054             $result = mb_substr($this->string, $this->next, $count);
    00055
    00056             $this->next += $count;
    00057
    00058             return $result;
    00059         }
    00060
    00064         public function mark()
    00065         {
    00066             $this->ensureOpen();
    00067
    00068             $this->mark = $this->next;
    00069
    00070             return $this;
    00071         }
    00072
    00073         public function markSupported()
    00074         {
    00075             return true;
    00076         }
    00077
    00081         public function reset()
    00082         {
    00083             $this->ensureOpen();
    00084
    00085             $this->next = $this->mark;
    00086
    00087             return $this;
    00088         }
    00089
    00090         public function skip($count)
    00091         {
    00092             $this->ensureOpen();
    00093
    00094             if ($this->isEof())
    00095                 return 0;
    00096
    00097             $actualSkip =
    00098                 max(
    00099                     -$this->next,
    00100                     min($this->length - $this->next, $count)
    00101                 );
    00102
    00103             $this->next += $actualSkip;
    00104
    00105             return $actualSkip;
    00106         }
    00107
    00108         public function isEof()
    00109         {
    00110             return ($this->next >= $this->length);
    00111         }
    00112
    00113         public function getWhole()
    00114         {
    00115             return $this->read($this->length - $this->next);
    00116         }
    00117
    00118         /* void */ private function ensureOpen()
    00119         {
    00120             if ($this->string === null)
    00121                 throw new IOException('Stream closed');
    00122         }
    00123     }
    00124 ?>