1:  2:  3:  4:  5:  6:  7:  8:  9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: 55: 56: 57: 58: 59: 60: 61: 62: 63: 64: 65: 66: 67: 68: 69: 70: 71: 72: 73: 74: 75: 76: 77: 

<?php

/*
 * This file is part of the webmozart/console package.
 *
 * (c) Bernhard Schussek <bschussek@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Webmozart\Console\IO\InputStream;

/**
 * An input stream that reads from a string.
 *
 * @since  1.0
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class StringInputStream extends StreamInputStream
{
    /**
     * @var resource
     */
    private $stream;

    /**
     * Creates the input stream.
     *
     * @param string $string The string to read from.
     */
    public function __construct($string = '')
    {
        $this->stream = fopen('php://memory', 'rw');

        parent::__construct($this->stream);

        $this->set($string);
    }

    /**
     * Clears the contents of the buffer.
     */
    public function clear()
    {
        ftruncate($this->stream, 0);
        rewind($this->stream);
    }

    /**
     * Sets the string to read from.
     *
     * @param string $string The string to read from.
     */
    public function set($string)
    {
        $this->clear();

        fwrite($this->stream, $string);
        rewind($this->stream);
    }

    /**
     * Appends a string to the stream.
     *
     * @param string $string The string to append.
     */
    public function append($string)
    {
        $pos = ftell($this->stream);
        fseek($this->stream, 0, SEEK_END);
        fwrite($this->stream, $string);
        fseek($this->stream, $pos);
    }
}