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phpoption/composer.json 0000644 00000002457 15002203421 0011303 0 ustar 00 { "name": "phpoption/phpoption", "description": "Option Type for PHP", "keywords": ["php", "option", "language", "type"], "license": "Apache-2.0", "authors": [ { "name": "Johannes M. Schmitt", "email": "schmittjoh@gmail.com", "homepage": "https://github.com/schmittjoh" }, { "name": "Graham Campbell", "email": "hello@gjcampbell.co.uk", "homepage": "https://github.com/GrahamCampbell" } ], "require": { "php": "^7.2.5 || ^8.0" }, "require-dev": { "bamarni/composer-bin-plugin": "^1.8.2", "phpunit/phpunit": "^8.5.34 || ^9.6.13 || ^10.4.2" }, "autoload": { "psr-4": { "PhpOption\\": "src/PhpOption/" } }, "autoload-dev": { "psr-4": { "PhpOption\\Tests\\": "tests/PhpOption/Tests/" } }, "config": { "allow-plugins": { "bamarni/composer-bin-plugin": true }, "preferred-install": "dist" }, "extra": { "bamarni-bin": { "bin-links": true, "forward-command": true }, "branch-alias": { "dev-master": "1.9-dev" } }, "minimum-stability": "dev", "prefer-stable": true } phpoption/LICENSE 0000644 00000026134 15002203421 0007564 0 ustar 00 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. 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We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. phpoption/src/PhpOption/None.php 0000644 00000004722 15002203421 0012675 0 ustar 00 <?php /* * Copyright 2012 Johannes M. Schmitt <schmittjoh@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace PhpOption; use EmptyIterator; /** * @extends Option<mixed> */ final class None extends Option { /** @var None|null */ private static $instance; /** * @return None */ public static function create(): self { if (null === self::$instance) { self::$instance = new self(); } return self::$instance; } public function get() { throw new \RuntimeException('None has no value.'); } public function getOrCall($callable) { return $callable(); } public function getOrElse($default) { return $default; } public function getOrThrow(\Exception $ex) { throw $ex; } public function isEmpty(): bool { return true; } public function isDefined(): bool { return false; } public function orElse(Option $else) { return $else; } public function ifDefined($callable) { // Just do nothing in that case. } public function forAll($callable) { return $this; } public function map($callable) { return $this; } public function flatMap($callable) { return $this; } public function filter($callable) { return $this; } public function filterNot($callable) { return $this; } public function select($value) { return $this; } public function reject($value) { return $this; } public function getIterator(): EmptyIterator { return new EmptyIterator(); } public function foldLeft($initialValue, $callable) { return $initialValue; } public function foldRight($initialValue, $callable) { return $initialValue; } private function __construct() { } } phpoption/src/PhpOption/Option.php 0000644 00000032034 15002203421 0013243 0 ustar 00 <?php /* * Copyright 2012 Johannes M. Schmitt <schmittjoh@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace PhpOption; use ArrayAccess; use IteratorAggregate; /** * @template T * * @implements IteratorAggregate<T> */ abstract class Option implements IteratorAggregate { /** * Creates an option given a return value. * * This is intended for consuming existing APIs and allows you to easily * convert them to an option. By default, we treat ``null`` as the None * case, and everything else as Some. * * @template S * * @param S $value The actual return value. * @param S $noneValue The value which should be considered "None"; null by * default. * * @return Option<S> */ public static function fromValue($value, $noneValue = null) { if ($value === $noneValue) { return None::create(); } return new Some($value); } /** * Creates an option from an array's value. * * If the key does not exist in the array, the array is not actually an * array, or the array's value at the given key is null, None is returned. * Otherwise, Some is returned wrapping the value at the given key. * * @template S * * @param array<string|int,S>|ArrayAccess<string|int,S>|null $array A potential array or \ArrayAccess value. * @param string $key The key to check. * * @return Option<S> */ public static function fromArraysValue($array, $key) { if (!(is_array($array) || $array instanceof ArrayAccess) || !isset($array[$key])) { return None::create(); } return new Some($array[$key]); } /** * Creates a lazy-option with the given callback. * * This is also a helper constructor for lazy-consuming existing APIs where * the return value is not yet an option. By default, we treat ``null`` as * None case, and everything else as Some. * * @template S * * @param callable $callback The callback to evaluate. * @param array $arguments The arguments for the callback. * @param S $noneValue The value which should be considered "None"; * null by default. * * @return LazyOption<S> */ public static function fromReturn($callback, array $arguments = [], $noneValue = null) { return new LazyOption(static function () use ($callback, $arguments, $noneValue) { /** @var mixed */ $return = call_user_func_array($callback, $arguments); if ($return === $noneValue) { return None::create(); } return new Some($return); }); } /** * Option factory, which creates new option based on passed value. * * If value is already an option, it simply returns. If value is callable, * LazyOption with passed callback created and returned. If Option * returned from callback, it returns directly. On other case value passed * to Option::fromValue() method. * * @template S * * @param Option<S>|callable|S $value * @param S $noneValue Used when $value is mixed or * callable, for None-check. * * @return Option<S>|LazyOption<S> */ public static function ensure($value, $noneValue = null) { if ($value instanceof self) { return $value; } elseif (is_callable($value)) { return new LazyOption(static function () use ($value, $noneValue) { /** @var mixed */ $return = $value(); if ($return instanceof self) { return $return; } else { return self::fromValue($return, $noneValue); } }); } else { return self::fromValue($value, $noneValue); } } /** * Lift a function so that it accepts Option as parameters. * * We return a new closure that wraps the original callback. If any of the * parameters passed to the lifted function is empty, the function will * return a value of None. Otherwise, we will pass all parameters to the * original callback and return the value inside a new Option, unless an * Option is returned from the function, in which case, we use that. * * @template S * * @param callable $callback * @param mixed $noneValue * * @return callable */ public static function lift($callback, $noneValue = null) { return static function () use ($callback, $noneValue) { /** @var array<int, mixed> */ $args = func_get_args(); $reduced_args = array_reduce( $args, /** @param bool $status */ static function ($status, self $o) { return $o->isEmpty() ? true : $status; }, false ); // if at least one parameter is empty, return None if ($reduced_args) { return None::create(); } $args = array_map( /** @return T */ static function (self $o) { // it is safe to do so because the fold above checked // that all arguments are of type Some /** @var T */ return $o->get(); }, $args ); return self::ensure(call_user_func_array($callback, $args), $noneValue); }; } /** * Returns the value if available, or throws an exception otherwise. * * @throws \RuntimeException If value is not available. * * @return T */ abstract public function get(); /** * Returns the value if available, or the default value if not. * * @template S * * @param S $default * * @return T|S */ abstract public function getOrElse($default); /** * Returns the value if available, or the results of the callable. * * This is preferable over ``getOrElse`` if the computation of the default * value is expensive. * * @template S * * @param callable():S $callable * * @return T|S */ abstract public function getOrCall($callable); /** * Returns the value if available, or throws the passed exception. * * @param \Exception $ex * * @return T */ abstract public function getOrThrow(\Exception $ex); /** * Returns true if no value is available, false otherwise. * * @return bool */ abstract public function isEmpty(); /** * Returns true if a value is available, false otherwise. * * @return bool */ abstract public function isDefined(); /** * Returns this option if non-empty, or the passed option otherwise. * * This can be used to try multiple alternatives, and is especially useful * with lazy evaluating options: * * ```php * $repo->findSomething() * ->orElse(new LazyOption(array($repo, 'findSomethingElse'))) * ->orElse(new LazyOption(array($repo, 'createSomething'))); * ``` * * @param Option<T> $else * * @return Option<T> */ abstract public function orElse(self $else); /** * This is similar to map() below except that the return value has no meaning; * the passed callable is simply executed if the option is non-empty, and * ignored if the option is empty. * * In all cases, the return value of the callable is discarded. * * ```php * $comment->getMaybeFile()->ifDefined(function($file) { * // Do something with $file here. * }); * ``` * * If you're looking for something like ``ifEmpty``, you can use ``getOrCall`` * and ``getOrElse`` in these cases. * * @deprecated Use forAll() instead. * * @param callable(T):mixed $callable * * @return void */ abstract public function ifDefined($callable); /** * This is similar to map() except that the return value of the callable has no meaning. * * The passed callable is simply executed if the option is non-empty, and ignored if the * option is empty. This method is preferred for callables with side-effects, while map() * is intended for callables without side-effects. * * @param callable(T):mixed $callable * * @return Option<T> */ abstract public function forAll($callable); /** * Applies the callable to the value of the option if it is non-empty, * and returns the return value of the callable wrapped in Some(). * * If the option is empty, then the callable is not applied. * * ```php * (new Some("foo"))->map('strtoupper')->get(); // "FOO" * ``` * * @template S * * @param callable(T):S $callable * * @return Option<S> */ abstract public function map($callable); /** * Applies the callable to the value of the option if it is non-empty, and * returns the return value of the callable directly. * * In contrast to ``map``, the return value of the callable is expected to * be an Option itself; it is not automatically wrapped in Some(). * * @template S * * @param callable(T):Option<S> $callable must return an Option * * @return Option<S> */ abstract public function flatMap($callable); /** * If the option is empty, it is returned immediately without applying the callable. * * If the option is non-empty, the callable is applied, and if it returns true, * the option itself is returned; otherwise, None is returned. * * @param callable(T):bool $callable * * @return Option<T> */ abstract public function filter($callable); /** * If the option is empty, it is returned immediately without applying the callable. * * If the option is non-empty, the callable is applied, and if it returns false, * the option itself is returned; otherwise, None is returned. * * @param callable(T):bool $callable * * @return Option<T> */ abstract public function filterNot($callable); /** * If the option is empty, it is returned immediately. * * If the option is non-empty, and its value does not equal the passed value * (via a shallow comparison ===), then None is returned. Otherwise, the * Option is returned. * * In other words, this will filter all but the passed value. * * @param T $value * * @return Option<T> */ abstract public function select($value); /** * If the option is empty, it is returned immediately. * * If the option is non-empty, and its value does equal the passed value (via * a shallow comparison ===), then None is returned; otherwise, the Option is * returned. * * In other words, this will let all values through except the passed value. * * @param T $value * * @return Option<T> */ abstract public function reject($value); /** * Binary operator for the initial value and the option's value. * * If empty, the initial value is returned. If non-empty, the callable * receives the initial value and the option's value as arguments. * * ```php * * $some = new Some(5); * $none = None::create(); * $result = $some->foldLeft(1, function($a, $b) { return $a + $b; }); // int(6) * $result = $none->foldLeft(1, function($a, $b) { return $a + $b; }); // int(1) * * // This can be used instead of something like the following: * $option = Option::fromValue($integerOrNull); * $result = 1; * if ( ! $option->isEmpty()) { * $result += $option->get(); * } * ``` * * @template S * * @param S $initialValue * @param callable(S, T):S $callable * * @return S */ abstract public function foldLeft($initialValue, $callable); /** * foldLeft() but with reversed arguments for the callable. * * @template S * * @param S $initialValue * @param callable(T, S):S $callable * * @return S */ abstract public function foldRight($initialValue, $callable); } phpoption/src/PhpOption/LazyOption.php 0000644 00000007762 15002203421 0014115 0 ustar 00 <?php /* * Copyright 2012 Johannes M. Schmitt <schmittjoh@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace PhpOption; use Traversable; /** * @template T * * @extends Option<T> */ final class LazyOption extends Option { /** @var callable(mixed...):(Option<T>) */ private $callback; /** @var array<int, mixed> */ private $arguments; /** @var Option<T>|null */ private $option; /** * @template S * @param callable(mixed...):(Option<S>) $callback * @param array<int, mixed> $arguments * * @return LazyOption<S> */ public static function create($callback, array $arguments = []): self { return new self($callback, $arguments); } /** * @param callable(mixed...):(Option<T>) $callback * @param array<int, mixed> $arguments */ public function __construct($callback, array $arguments = []) { if (!is_callable($callback)) { throw new \InvalidArgumentException('Invalid callback given'); } $this->callback = $callback; $this->arguments = $arguments; } public function isDefined(): bool { return $this->option()->isDefined(); } public function isEmpty(): bool { return $this->option()->isEmpty(); } public function get() { return $this->option()->get(); } public function getOrElse($default) { return $this->option()->getOrElse($default); } public function getOrCall($callable) { return $this->option()->getOrCall($callable); } public function getOrThrow(\Exception $ex) { return $this->option()->getOrThrow($ex); } public function orElse(Option $else) { return $this->option()->orElse($else); } public function ifDefined($callable) { $this->option()->forAll($callable); } public function forAll($callable) { return $this->option()->forAll($callable); } public function map($callable) { return $this->option()->map($callable); } public function flatMap($callable) { return $this->option()->flatMap($callable); } public function filter($callable) { return $this->option()->filter($callable); } public function filterNot($callable) { return $this->option()->filterNot($callable); } public function select($value) { return $this->option()->select($value); } public function reject($value) { return $this->option()->reject($value); } /** * @return Traversable<T> */ public function getIterator(): Traversable { return $this->option()->getIterator(); } public function foldLeft($initialValue, $callable) { return $this->option()->foldLeft($initialValue, $callable); } public function foldRight($initialValue, $callable) { return $this->option()->foldRight($initialValue, $callable); } /** * @return Option<T> */ private function option(): Option { if (null === $this->option) { /** @var mixed */ $option = call_user_func_array($this->callback, $this->arguments); if ($option instanceof Option) { $this->option = $option; } else { throw new \RuntimeException(sprintf('Expected instance of %s', Option::class)); } } return $this->option; } } phpoption/src/PhpOption/Some.php 0000644 00000006367 15002203421 0012710 0 ustar 00 <?php /* * Copyright 2012 Johannes M. Schmitt <schmittjoh@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace PhpOption; use ArrayIterator; /** * @template T * * @extends Option<T> */ final class Some extends Option { /** @var T */ private $value; /** * @param T $value */ public function __construct($value) { $this->value = $value; } /** * @template U * * @param U $value * * @return Some<U> */ public static function create($value): self { return new self($value); } public function isDefined(): bool { return true; } public function isEmpty(): bool { return false; } public function get() { return $this->value; } public function getOrElse($default) { return $this->value; } public function getOrCall($callable) { return $this->value; } public function getOrThrow(\Exception $ex) { return $this->value; } public function orElse(Option $else) { return $this; } public function ifDefined($callable) { $this->forAll($callable); } public function forAll($callable) { $callable($this->value); return $this; } public function map($callable) { return new self($callable($this->value)); } public function flatMap($callable) { /** @var mixed */ $rs = $callable($this->value); if (!$rs instanceof Option) { throw new \RuntimeException('Callables passed to flatMap() must return an Option. Maybe you should use map() instead?'); } return $rs; } public function filter($callable) { if (true === $callable($this->value)) { return $this; } return None::create(); } public function filterNot($callable) { if (false === $callable($this->value)) { return $this; } return None::create(); } public function select($value) { if ($this->value === $value) { return $this; } return None::create(); } public function reject($value) { if ($this->value === $value) { return None::create(); } return $this; } /** * @return ArrayIterator<int, T> */ public function getIterator(): ArrayIterator { return new ArrayIterator([$this->value]); } public function foldLeft($initialValue, $callable) { return $callable($initialValue, $this->value); } public function foldRight($initialValue, $callable) { return $callable($this->value, $initialValue); } }
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