<?php
namespace eMacros\Runtime\Collection;
use eMacros\Runtime\GenericFunction;
class Cdr extends GenericFunction {
/**
* Returns a list without its first element
* Usage: (Array::cdr (array 1 2 3))
* Returns: array
* (non-PHPdoc)
* @see \eMacros\Runtime\GenericFunction::execute()
*/
public function execute(array $arguments) {
if (empty($arguments)) {
throw new \BadFunctionCallException("Cdr: No parameters found.");
}
list($list) = $arguments;
if (is_array($list)) {
if (empty($list)) {
return null;
}
return array_slice($list, 1);
}
if ($list instanceof \Iterator || $list instanceof \IteratorAggregate) {
$it = $list instanceof \Iterator ? $list : $list->getIterator();
$it->rewind();
//empty list?
if (!$it->valid()) {
return null;
}
$result = array();
for ($it->next(); $it->valid(); $it->next()) {
$result[] = $it->current();
}
return $result;
}
throw new \InvalidArgumentException('Cdr: Parameter is not a list.');
}
}
?>
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