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Date: Sat, 2 Jan 2010 14:32:38 -0800
Message-ID: <c25f8d341001021432s182f4a7dxdcebb9fbf40b567f@mail.gmail.com>
To: Oskar Eisemuth <patchnow@gmail.com>
Cc: internals@lists.php.net
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Subject: Re: [PHP-DEV] array position isfirst / islast / valid ?
From: 0xcafefeed@gmail.com (mm w)

<?php

interface FastEnumeration extends IteratorAggregate
{

};

interface FastEnumerator extends Iterator
{

};

define('EnumerationConcurrent', 0);
define('EnumerationReverse', 1);

class Enumerator implements FastEnumerator
{
	private $arr;
	private $reversed;
=09
	function __construct(array &$arr, $reversed =3D 0) {
		$this->reversed  =3D $reversed;
		$this->arr =3D $arr;
		if ($this->reversed) {
			end($this->arr);
		}
	}
=09
	public function first() {
		if ($this->reversed) {
			$cnt =3D count($this->arr);
			$idx =3D $cnt > 1 ? $cnt - 1 : 0;
		} else {
			$idx =3D 0;
		}
		return $this->arr[$idx];
	}
=09
	public function last() {
		if ($this->reversed) {
			$idx =3D 0;
		} else {
			$cnt =3D count($this->arr);
			$idx =3D $cnt > 1 ? $cnt - 1 : 0;
		}
		return $this->arr[$idx];
	}
=09
	public function isfirst() {
		if ($this->reversed) {
			$cnt =3D count($this->arr);
			$idx =3D $cnt > 1 ? $cnt - 1 : 0;
		} else {
			$idx =3D 0;
		}
		return key($this->arr) =3D=3D $idx;
	}
=09
	public function islast() {
		if ($this->reversed) {
			$idx =3D 0;
		} else {
			$cnt =3D count($this->arr);
			$idx =3D $cnt > 1 ? $cnt - 1 : 0;
		}
		return key($this->arr) =3D=3D $idx;
	}
=09
	public function rewind() {
		if ($this->reversed) {
			end($this->arr);
		} else {
			reset($this->arr);
		}
	}
=09
	public function current() {
		return current($this->arr);
	}
=09
	public function key() {
		return key($this->arr);
	}
=09
	public function end() {
		if ($this->reversed) {
			reset($this->arr);
		} else {
			end($this->arr);
		}
	}


	public function next() {
		if ($this->reversed) {
			return prev($this->arr);
		} else {
			return next($this->arr);
		}
	}
=09
	public function prev() {
		if ($this->reversed) {
			return next($this->arr);
		} else {
			return prev($this->arr);
		}
	}

	public function valid() {
		$current =3D $this->current();
		return  !empty($current) && $current !=3D null;
	}
};

class MArray implements FastEnumeration
{
	private $arr;
=09
	public function getIterator() {
		return new Enumerator($this->arr);
        }

	public function reverseEnumerator() {
		return new Enumerator($this->arr, EnumerationReverse);
	}

	public function concurrentEnumerator() {
		return new Enumerator($this->arr, EnumerationConcurrent);
    }

    // ...
};

/* EOF */ ?>

On Sat, Jan 2, 2010 at 8:47 AM, Oskar Eisemuth <patchnow@gmail.com> wrote:
> Hello
>
> Would it be possible to add functions to know the relative internal array
> position?
>
> I found "[PHP-DEV] RFC array functions" from 2006, but nothing really
> changed.
>
> The need to use next, prev in combination is ridiculous compared to a cle=
an
> array_hasmore or array_pos_islast, as the internals already know this.
> To get an array_valid_position or array_pos_isvalid wouldn't be bad eithe=
r.
>
> So would it possible to introduce:
>
> array_pos_isfirst(& =C2=A0$array)
> array_pos_islast(& =C2=A0$array)
> array_pos_isvalid(& =C2=A0$array)
>
>
> Best regards
> Oskar Eisemuth
>
>
>
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