/**
* Executes a filter on a value if there is one.
*
* @param mixed $value value to filter
* @param function $filter filter to use to transform
* @return mixed filtered value
*/
function _transform($value, $filter)
{
if ($filter instanceof T_Filter) {
return $filter->transform($value);
} elseif ($filter) {
return call_user_func_array($filter, array($value));
} else {
return $value;
}
}
/**
* Add a {@link net.objecthunter.exp4j.function.Function} implementation available for use in the expression
* @param function $function the custom {@link net.objecthunter.exp4j.function.Function} implementation that should be available for use in the expression.
* @return self the ExpressionBuilder instance
*/
public function func($function)
{
$this->userFunctions[$function->getName()] = $function;
return $this;
}
/**
* Invoke a closure with context(explicitly or implicitly)
* if Preview::$config->use_implicit_context is set to true,
* the closure will be bound to the context object.
* Otherwise context will be passed to closure as an argument.
*
* @param function $fn
* @param object context object (new stdClass)
* @return mixed
*/
protected function invoke_closure_with_context($fn, $context)
{
if (Preview::$config->use_implicit_context) {
return $fn->bindTo($context, $context)->__invoke();
} else {
return $fn->__invoke($context);
}
}
