/**
* @param string $input Source string of equation
* @return array Tokens stream
* @throws \Z\Exception\IncorrectExpressionException
*/
public function stringToTokensStream($input)
{
$matches = array();
preg_match_all($this->tokenFactory->getTokenParserRegex(), $input, $matches);
$tokenFactory = $this->tokenFactory;
$matches = array_diff($matches[0], [""]);
$tokensStream = array_map(function ($token) use($tokenFactory) {
return $tokenFactory->createToken($token);
}, $matches);
return $tokensStream;
}
/**
* Add function to executor
*
* @param string $name Name of function
* @param callable $function Function
* @param int $places Count of arguments
* @return MathExecutor
*/
public function addFunction($name, callable $function = null, $places = 1)
{
$this->tokenFactory->addFunction($name, $function, $places);
return $this;
}