<?php
namespace NXP\Classes;
use NXP\Exception\IncorrectExpressionException;
use ReflectionFunction;
class Operator
{
public $function;
public int $places = 0;
public function __construct(public string $operator, public bool $isRightAssoc, public int $priority, callable $function)
{
$this->function = $function;
$reflection = new ReflectionFunction($function);
$this->places = $reflection->getNumberOfParameters();
}
public function execute(array &$stack) : Token
{
if (\count($stack) < $this->places) {
throw new IncorrectExpressionException();
}
$args = [];
for ($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);
}
}