<?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 Nette;
/**
* Utilities for iterables.
*/
final class Iterables
{
use Nette\StaticClass;
/**
* Tests for the presence of value.
*/
public static function contains(iterable $iterable, mixed $value): bool
{
foreach ($iterable as $v) {
if ($v === $value) {
return true;
}
}
return false;
}
/**
* Tests for the presence of key.
*/
public static function containsKey(iterable $iterable, mixed $key): bool
{
foreach ($iterable as $k => $v) {
if ($k === $key) {
return true;
}
}
return false;
}
/**
* 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, mixed $key, iterable $iterable): bool`.
* @template T
* @param iterable<T> $iterable
* @return ?T
*/
public static function first(iterable $iterable, ?callable $predicate = null, ?callable $else = null): mixed
{
foreach ($iterable as $k => $v) {
if (!$predicate || $predicate($v, $k, $iterable)) {
return $v;
}
}
return $else ? $else() : null;
}
/**
* Returns the key of 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, mixed $key, iterable $iterable): bool`.
* @template T
* @param iterable<T, mixed> $iterable
* @return ?T
*/
public static function firstKey(iterable $iterable, ?callable $predicate = null, ?callable $else = null): mixed
{
foreach ($iterable as $k => $v) {
if (!$predicate || $predicate($v, $k, $iterable)) {
return $k;
}
}
return $else ? $else() : null;
}
/**
* Tests whether at least one element in the iterator passes the test implemented by the
* provided callback with signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
* @template K
* @template V
* @param iterable<K, V> $iterable
* @param callable(V, K, iterable<K, V>): bool $predicate
*/
public static function some(iterable $iterable, callable $predicate): bool
{
foreach ($iterable as $k => $v) {
if ($predicate($v, $k, $iterable)) {
return true;
}
}
return false;
}
/**
* Tests whether all elements in the iterator pass the test implemented by the provided function,
* which has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
* @template K
* @template V
* @param iterable<K, V> $iterable
* @param callable(V, K, iterable<K, V>): bool $predicate
*/
public static function every(iterable $iterable, callable $predicate): bool
{
foreach ($iterable as $k => $v) {
if (!$predicate($v, $k, $iterable)) {
return false;
}
}
return true;
}
/**
* Iterator that filters elements according to a given $predicate. Maintains original keys.
* The callback has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
* @template K
* @template V
* @param iterable<K, V> $iterable
* @param callable(V, K, iterable<K, V>): bool $predicate
* @return \Generator<K, V>
*/
public static function filter(iterable $iterable, callable $predicate): \Generator
{
foreach ($iterable as $k => $v) {
if ($predicate($v, $k, $iterable)) {
yield $k => $v;
}
}
}
/**
* Iterator that transforms values by calling $transformer. Maintains original keys.
* The callback has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
* @template K
* @template V
* @template R
* @param iterable<K, V> $iterable
* @param callable(V, K, iterable<K, V>): R $transformer
* @return \Generator<K, R>
*/
public static function map(iterable $iterable, callable $transformer): \Generator
{
foreach ($iterable as $k => $v) {
yield $k => $transformer($v, $k, $iterable);
}
}
}
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