Stream.php

<?php

use const Prelude\{_, id, isResource};
use function Prelude\{always, ifElse, apply, placeholder};

class Stream
{
    protected $stream;

    public function __construct($stream, $options = [])
    {
        $fn = ifElse(isResource, id, function () {
            throw new \InvalidArgumentException();
        });

        $this->stream = $fn($stream);
    }

    public function eof()
    {
    }

    public function close()
    {
        return $this->do('fclose');
    }

    public function write()
    {
    }

    public function tell()
    {
        return $this->do('ftell');
    }

    public function seek($offset, $whence = SEEK_SET)
    {
        return $this->do(placeholder('fseek', _, $offset, $whence));
    }

    public function rewind()
    {
        return $this->do('rewind');
    }

    public function readLine()
    {
        return $this->do(placeholder('stream_get_line', _, 1024, "\n"));
    }

    public function __destruct()
    {
        $this->close();
    }

    private function do(callable $callback)
    {
        return apply(ifElse(isResource, apply($callback), always(false)), $this->stream);
    }
}