<?php
namespace eMacros\Runtime\Collection;
use eMacros\Applicable;
use eMacros\Scope;
use eMacros\GenericList;
use eMacros\Symbol;
class ArrayShift implements Applicable {
/**
* Shifts the first value of an array off and returns it
* Usage: (Array::shift _arr)
* Returns: mixed
* (non-PHPdoc)
* @see \eMacros\Applicable::apply()
*/
public function apply(Scope $scope, GenericList $arguments) {
if (count($arguments) == 0) {
throw new \BadFunctionCallException();
}
$target = $arguments[0];
if (!($target instanceof Symbol)) {
throw new \InvalidArgumentException(sprintf("ArrayShift: Expected symbol as first argument but %s was found instead.", substr(strtolower(strstr(get_class($arguments[0]), '\\')), 1)));
}
$ref = $target->symbol;
if (is_array($scope->symbols[$ref])) {
return array_shift($scope->symbols[$ref]);
}
elseif ($scope->symbols[$ref] instanceof \ArrayObject) {
$arr = $scope->symbols[$ref]->getArrayCopy();
$value = array_shift($arr);
if (count($scope->symbols[$ref]->getArrayCopy()) != 0) {
$scope->symbols[$ref]->exchangeArray($arr);
}
return $value;
}
return null;
}
}
?>
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