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<?php
namespace NXP\Classes;
use NXP\Exception\IncorrectNumberOfFunctionParametersException;
use ReflectionException;
use ReflectionFunction;
class CustomFunction
{
/**
* @var string
*/
public $name;
/**
* @var callable $function
*/
public $function;
/**
* @var int
*/
public $places;
/**
* CustomFunction constructor.
* @param string $name
* @param callable $function
* @param int $places
* @throws ReflectionException
* @throws IncorrectNumberOfFunctionParametersException
*/
public function __construct(string $name, callable $function, ?int $places = null)
{
$this->name = $name;
$this->function = $function;
if ($places === null) {
$reflection = new ReflectionFunction($function);
$this->places = $reflection->getNumberOfParameters();
} else {
$this->places = $places;
}
}
/**
* @param array<Token> $stack
*
* @throws IncorrectNumberOfFunctionParametersException
*/
public function execute(array &$stack) : Token
{
if (count($stack) < $this->places) {
throw new IncorrectNumberOfFunctionParametersException($this->name);
}
$args = [];
for ($i = 0; $i < $this->places; $i++) {
array_unshift($args, array_pop($stack)->value);
}
$result = call_user_func_array($this->function, $args);
return new Token(Token::Literal, $result);
}
}
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