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<?php
/*
* Copyright 2018 Google LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Google\ApiCore;
/**
* Provides basic array helper methods.
*
* @internal
*/
trait ArrayTrait
{
/**
* Pluck a value out of an array.
*
* @param string $key
* @param array $arr
* @param bool $isRequired
* @return mixed|null
* @throws \InvalidArgumentException
*/
private function pluck(string $key, array &$arr, bool $isRequired = true)
{
if (!array_key_exists($key, $arr)) {
if ($isRequired) {
throw new \InvalidArgumentException(
"Key $key does not exist in the provided array."
);
}
return null;
}
$value = $arr[$key];
unset($arr[$key]);
return $value;
}
/**
* Pluck a subset of an array.
*
* @param array $keys
* @param array $arr
* @return array
*/
private function pluckArray(array $keys, array &$arr)
{
$values = [];
foreach ($keys as $key) {
if (array_key_exists($key, $arr)) {
$values[$key] = $this->pluck($key, $arr, false);
}
}
return $values;
}
/**
* Determine whether given array is associative.
*
* @param array $arr
* @return bool
*/
private function isAssoc(array $arr)
{
return array_keys($arr) !== range(0, count($arr) - 1);
}
/**
* Just like array_filter(), but preserves falsey values except null.
*
* @param array $arr
* @return array
*/
private function arrayFilterRemoveNull(array $arr)
{
return array_filter($arr, function ($element) {
if (!is_null($element)) {
return true;
}
return false;
});
}
/**
* Return a subset of an array, like pluckArray, without modifying the original array.
*
* @param array $keys
* @param array $arr
* @return array
*/
private function subsetArray(array $keys, array $arr)
{
return array_intersect_key(
$arr,
array_flip($keys)
);
}
}
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