__ __ __ __ _____ _ _ _____ _ _ _
| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<?php
namespace jlawrence\eos;
/**
* Basic Stack Class.
*
* Created for use with eqEOS. May eventually be replaced with native
* PHP functions `array_pop()`, `array_push()`, and `end()`
*
* @author Jon Lawrence <jlawrence11@gmail.com>
* @copyright Copyright ©2005-2015 Jon Lawrence
* @license http://opensource.org/licenses/LGPL-2.1 LGPL 2.1 License
* @package Math
* @version 0.1
*/
class Stack {
private $index;
private $locArray;
/**
* Constructor
*
* Initializes the stack
*/
public function __construct() {
//define the private vars
$this->locArray = array();
$this->index = -1;
}
/**
* Peek
*
* Will view the last element of the stack without removing it
*
* @return mixed An element of the array or false if none exist
*/
public function peek() {
if($this->index > -1)
return $this->locArray[$this->index];
else
return false;
}
/**
* Poke
*
* Will add an element to the end of the stack
*
* @param mixed $data Element to add
*/
public function poke($data) {
$this->locArray[++$this->index] = $data;
}
/**
* Push
*
* Alias of {@see Stack::poke()}
* Adds element to the stack
*
* @param mixed $data Element to add
*/
public function push($data) {
//alias for 'poke'
$this->poke($data);
}
/**
* Pop
*
* Retrieves an element from the end of the stack, and removes it from
* the stack at the same time. If no elements, returns boolean false
*
* @return mixed Element at end of stack or false if none exist
*/
public function pop() {
if($this->index > -1)
{
$this->index--;
return $this->locArray[$this->index+1];
}
else
return false;
}
/**
* Clear
*
* Clears the stack to be reused.
*/
public function clear() {
$this->index = -1;
$this->locArray = array();
}
/**
* Get Stack
*
* Returns the array of stack elements, keeping all, indexed at 0
*
* @return mixed Array of stack elements or false if none exist.
*/
public function getStack() {
if($this->index > -1)
{
return array_values($this->locArray);
}
else
return false;
}
}
?>