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