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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use JetBrains\PhpStorm\Language;
use Nette;
use function is_array, is_int, is_object, count;
/**
* Array tools library.
*/
class Arrays
{
use Nette\StaticClass;
/**
* Returns item from array. If it does not exist, it throws an exception, unless a default value is set.
* @template T
* @param array<T> $array
* @param array-key|array-key[] $key
* @param ?T $default
* @return ?T
* @throws Nette\InvalidArgumentException if item does not exist and default value is not provided
*/
public static function get(array $array, string|int|array $key, mixed $default = null): mixed
{
foreach (is_array($key) ? $key : [$key] as $k) {
if (is_array($array) && array_key_exists($k, $array)) {
$array = $array[$k];
} else {
if (func_num_args() < 3) {
throw new Nette\InvalidArgumentException("Missing item '$k'.");
}
return $default;
}
}
return $array;
}
/**
* Returns reference to array item. If the index does not exist, new one is created with value null.
* @template T
* @param array<T> $array
* @param array-key|array-key[] $key
* @return ?T
* @throws Nette\InvalidArgumentException if traversed item is not an array
*/
public static function &getRef(array &$array, string|int|array $key): mixed
{
foreach (is_array($key) ? $key : [$key] as $k) {
if (is_array($array) || $array === null) {
$array = &$array[$k];
} else {
throw new Nette\InvalidArgumentException('Traversed item is not an array.');
}
}
return $array;
}
/**
* Recursively merges two fields. It is useful, for example, for merging tree structures. It behaves as
* the + operator for array, ie. it adds a key/value pair from the second array to the first one and retains
* the value from the first array in the case of a key collision.
* @template T1
* @template T2
* @param array<T1> $array1
* @param array<T2> $array2
* @return array<T1|T2>
*/
public static function mergeTree(array $array1, array $array2): array
{
$res = $array1 + $array2;
foreach (array_intersect_key($array1, $array2) as $k => $v) {
if (is_array($v) && is_array($array2[$k])) {
$res[$k] = self::mergeTree($v, $array2[$k]);
}
}
return $res;
}
/**
* Returns zero-indexed position of given array key. Returns null if key is not found.
*/
public static function getKeyOffset(array $array, string|int $key): ?int
{
return Helpers::falseToNull(array_search(self::toKey($key), array_keys($array), strict: true));
}
/**
* @deprecated use getKeyOffset()
*/
public static function searchKey(array $array, $key): ?int
{
return self::getKeyOffset($array, $key);
}
/**
* Tests an array for the presence of value.
*/
public static function contains(array $array, mixed $value): bool
{
return in_array($value, $array, true);
}
/**
* Returns the first item (matching the specified predicate if given). If there is no such item, it returns result of invoking $else or null.
* The $predicate has the signature `function (mixed $value, int|string $key, array $array): bool`.
* @template T
* @param array<T> $array
* @return ?T
*/
public static function first(array $array, ?callable $predicate = null, ?callable $else = null): mixed
{
$key = self::firstKey($array, $predicate);
return $key === null
? ($else ? $else() : null)
: $array[$key];
}
/**
* Returns the last item (matching the specified predicate if given). If there is no such item, it returns result of invoking $else or null.
* The $predicate has the signature `function (mixed $value, int|string $key, array $array): bool`.
* @template T
* @param array<T> $array
* @return ?T
*/
public static function last(array $array, ?callable $predicate = null, ?callable $else = null): mixed
{
$key = self::lastKey($array, $predicate);
return $key === null
? ($else ? $else() : null)
: $array[$key];
}
/**
* Returns the key of first item (matching the specified predicate if given) or null if there is no such item.
* The $predicate has the signature `function (mixed $value, int|string $key, array $array): bool`.
*/
public static function firstKey(array $array, ?callable $predicate = null): int|string|null
{
if (!$predicate) {
return array_key_first($array);
}
foreach ($array as $k => $v) {
if ($predicate($v, $k, $array)) {
return $k;
}
}
return null;
}
/**
* Returns the key of last item (matching the specified predicate if given) or null if there is no such item.
* The $predicate has the signature `function (mixed $value, int|string $key, array $array): bool`.
*/
public static function lastKey(array $array, ?callable $predicate = null): int|string|null
{
return $predicate
? self::firstKey(array_reverse($array, preserve_keys: true), $predicate)
: array_key_last($array);
}
/**
* Inserts the contents of the $inserted array into the $array immediately after the $key.
* If $key is null (or does not exist), it is inserted at the beginning.
*/
public static function insertBefore(array &$array, string|int|null $key, array $inserted): void
{
$offset = $key === null ? 0 : (int) self::getKeyOffset($array, $key);
$array = array_slice($array, 0, $offset, preserve_keys: true)
+ $inserted
+ array_slice($array, $offset, count($array), preserve_keys: true);
}
/**
* Inserts the contents of the $inserted array into the $array before the $key.
* If $key is null (or does not exist), it is inserted at the end.
*/
public static function insertAfter(array &$array, string|int|null $key, array $inserted): void
{
if ($key === null || ($offset = self::getKeyOffset($array, $key)) === null) {
$offset = count($array) - 1;
}
$array = array_slice($array, 0, $offset + 1, preserve_keys: true)
+ $inserted
+ array_slice($array, $offset + 1, count($array), preserve_keys: true);
}
/**
* Renames key in array.
*/
public static function renameKey(array &$array, string|int $oldKey, string|int $newKey): bool
{
$offset = self::getKeyOffset($array, $oldKey);
if ($offset === null) {
return false;
}
$val = &$array[$oldKey];
$keys = array_keys($array);
$keys[$offset] = $newKey;
$array = array_combine($keys, $array);
$array[$newKey] = &$val;
return true;
}
/**
* Returns only those array items, which matches a regular expression $pattern.
* @param string[] $array
* @return string[]
*/
public static function grep(
array $array,
#[Language('RegExp')]
string $pattern,
bool|int $invert = false,
): array
{
$flags = $invert ? PREG_GREP_INVERT : 0;
return Strings::pcre('preg_grep', [$pattern, $array, $flags]);
}
/**
* Transforms multidimensional array to flat array.
*/
public static function flatten(array $array, bool $preserveKeys = false): array
{
$res = [];
$cb = $preserveKeys
? function ($v, $k) use (&$res): void { $res[$k] = $v; }
: function ($v) use (&$res): void { $res[] = $v; };
array_walk_recursive($array, $cb);
return $res;
}
/**
* Checks if the array is indexed in ascending order of numeric keys from zero, a.k.a list.
* @return ($value is list ? true : false)
*/
public static function isList(mixed $value): bool
{
return is_array($value) && (PHP_VERSION_ID < 80100
? !$value || array_keys($value) === range(0, count($value) - 1)
: array_is_list($value)
);
}
/**
* Reformats table to associative tree. Path looks like 'field|field[]field->field=field'.
* @param string|string[] $path
*/
public static function associate(array $array, $path): array|\stdClass
{
$parts = is_array($path)
? $path
: preg_split('#(\[\]|->|=|\|)#', $path, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
if (!$parts || $parts === ['->'] || $parts[0] === '=' || $parts[0] === '|') {
throw new Nette\InvalidArgumentException("Invalid path '$path'.");
}
$res = $parts[0] === '->' ? new \stdClass : [];
foreach ($array as $rowOrig) {
$row = (array) $rowOrig;
$x = &$res;
for ($i = 0; $i < count($parts); $i++) {
$part = $parts[$i];
if ($part === '[]') {
$x = &$x[];
} elseif ($part === '=') {
if (isset($parts[++$i])) {
$x = $row[$parts[$i]];
$row = null;
}
} elseif ($part === '->') {
if (isset($parts[++$i])) {
if ($x === null) {
$x = new \stdClass;
}
$x = &$x->{$row[$parts[$i]]};
} else {
$row = is_object($rowOrig) ? $rowOrig : (object) $row;
}
} elseif ($part !== '|') {
$x = &$x[(string) $row[$part]];
}
}
if ($x === null) {
$x = $row;
}
}
return $res;
}
/**
* Normalizes array to associative array. Replace numeric keys with their values, the new value will be $filling.
*/
public static function normalize(array $array, mixed $filling = null): array
{
$res = [];
foreach ($array as $k => $v) {
$res[is_int($k) ? $v : $k] = is_int($k) ? $filling : $v;
}
return $res;
}
/**
* Returns and removes the value of an item from an array. If it does not exist, it throws an exception,
* or returns $default, if provided.
* @template T
* @param array<T> $array
* @param ?T $default
* @return ?T
* @throws Nette\InvalidArgumentException if item does not exist and default value is not provided
*/
public static function pick(array &$array, string|int $key, mixed $default = null): mixed
{
if (array_key_exists($key, $array)) {
$value = $array[$key];
unset($array[$key]);
return $value;
} elseif (func_num_args() < 3) {
throw new Nette\InvalidArgumentException("Missing item '$key'.");
} else {
return $default;
}
}
/**
* Tests whether at least one element in the array passes the test implemented by the provided function,
* which has the signature `function ($value, $key, array $array): bool`.
* @template K
* @template V
* @param iterable<K, V> $array
* @param callable(V, K, ($array is array ? array<K, V> : iterable<K, V>)): bool $predicate
*/
public static function some(iterable $array, callable $predicate): bool
{
foreach ($array as $k => $v) {
if ($predicate($v, $k, $array)) {
return true;
}
}
return false;
}
/**
* Tests whether all elements in the array pass the test implemented by the provided function,
* which has the signature `function ($value, $key, array $array): bool`.
* @template K
* @template V
* @param iterable<K, V> $array
* @param callable(V, K, ($array is array ? array<K, V> : iterable<K, V>)): bool $predicate
*/
public static function every(iterable $array, callable $predicate): bool
{
foreach ($array as $k => $v) {
if (!$predicate($v, $k, $array)) {
return false;
}
}
return true;
}
/**
* Returns a new array containing all key-value pairs matching the given $predicate.
* The callback has the signature `function (mixed $value, int|string $key, array $array): bool`.
* @template K of array-key
* @template V
* @param array<K, V> $array
* @param callable(V, K, array<K, V>): bool $predicate
* @return array<K, V>
*/
public static function filter(array $array, callable $predicate): array
{
$res = [];
foreach ($array as $k => $v) {
if ($predicate($v, $k, $array)) {
$res[$k] = $v;
}
}
return $res;
}
/**
* Returns an array containing the original keys and results of applying the given transform function to each element.
* The function has signature `function ($value, $key, array $array): mixed`.
* @template K of array-key
* @template V
* @template R
* @param iterable<K, V> $array
* @param callable(V, K, ($array is array ? array<K, V> : iterable<K, V>)): R $transformer
* @return array<K, R>
*/
public static function map(iterable $array, callable $transformer): array
{
$res = [];
foreach ($array as $k => $v) {
$res[$k] = $transformer($v, $k, $array);
}
return $res;
}
/**
* Invokes all callbacks and returns array of results.
* @param callable[] $callbacks
*/
public static function invoke(iterable $callbacks, ...$args): array
{
$res = [];
foreach ($callbacks as $k => $cb) {
$res[$k] = $cb(...$args);
}
return $res;
}
/**
* Invokes method on every object in an array and returns array of results.
* @param object[] $objects
*/
public static function invokeMethod(iterable $objects, string $method, ...$args): array
{
$res = [];
foreach ($objects as $k => $obj) {
$res[$k] = $obj->$method(...$args);
}
return $res;
}
/**
* Copies the elements of the $array array to the $object object and then returns it.
* @template T of object
* @param T $object
* @return T
*/
public static function toObject(iterable $array, object $object): object
{
foreach ($array as $k => $v) {
$object->$k = $v;
}
return $object;
}
/**
* Converts value to array key.
*/
public static function toKey(mixed $value): int|string
{
return key([$value => null]);
}
/**
* Returns copy of the $array where every item is converted to string
* and prefixed by $prefix and suffixed by $suffix.
* @param string[] $array
* @return string[]
*/
public static function wrap(array $array, string $prefix = '', string $suffix = ''): array
{
$res = [];
foreach ($array as $k => $v) {
$res[$k] = $prefix . $v . $suffix;
}
return $res;
}
}
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