/**
* Internal function used for the main currying functionality
* @param callable $fn
* @param $appliedArgs
* @param $requiredParameters
* @return callable
*/
function _curry(callable $fn, $appliedArgs, $requiredParameters)
{
return function (...$args) use($fn, $appliedArgs, $requiredParameters) {
$originalArgs = $appliedArgs;
$newArgs = $args;
array_push($appliedArgs, ...$args);
// Get the number of arguments currently applied
$appliedArgsCount = count(array_filter($appliedArgs, function ($v) {
if ($v instanceof Placeholder) {
return false;
}
return true;
}));
// If we have the required number of arguments call the function
if ($appliedArgsCount >= $requiredParameters) {
foreach ($appliedArgs as $k => $v) {
if ($v instanceof Placeholder) {
$appliedArgs[$k] = array_shift($newArgs);
unset($appliedArgs[count($originalArgs) + $k]);
}
}
return $fn(...$appliedArgs);
// If we will have the required arguments on the next call, return an optimized function
} elseif ($appliedArgsCount + 1 === $requiredParameters) {
return bind($fn, ...$appliedArgs);
// Return the standard full curry
} else {
return _curry($fn, $appliedArgs, $requiredParameters);
}
};
}
/**
* Internal function used for the main currying functionality
* @param callable $fn
* @param $appliedArgs
* @param $requiredParameters
* @return callable
*/
function _curry(callable $fn, $appliedArgs, $requiredParameters)
{
return function (...$args) use($fn, $appliedArgs, $requiredParameters) {
array_push($appliedArgs, ...$args);
// Get the number of arguments currently applied
$appliedArgsCount = count($appliedArgs);
// If we have the required number of arguments call the function
if ($appliedArgsCount >= $requiredParameters) {
return $fn(...$appliedArgs);
// If we will have the required arguments on the next call, return an optimized function
} elseif ($appliedArgsCount + 1 === $requiredParameters) {
return bind($fn, ...$appliedArgs);
// Return the standard full curry
} else {
return _curry($fn, $appliedArgs, $requiredParameters);
}
};
}