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or(...$predicate): Predicate { array_unshift($predicate, $this); - return any($predicate); + return any(...$predicate); } } \ No newline at end of file diff --git a/src/Predicate/AllOfPredicate.php b/src/Predicate/AllOfPredicate.php index 7097cfc..9941e2f 100644 --- a/src/Predicate/AllOfPredicate.php +++ b/src/Predicate/AllOfPredicate.php @@ -28,7 +28,7 @@ class AllOfPredicate extends AbstractPredicate public function and(...$predicate): Predicate { $predicate = array_merge($this->predicates, $predicate); - return parent::and($predicate); + return parent::and(...$predicate); } public function __invoke(...$args): bool diff --git a/src/Predicate/AnyOfPredicate.php b/src/Predicate/AnyOfPredicate.php index 19f3cb7..35a184c 100644 --- a/src/Predicate/AnyOfPredicate.php +++ b/src/Predicate/AnyOfPredicate.php @@ -28,7 +28,7 @@ class AnyOfPredicate extends AbstractPredicate public function or(...$predicate): Predicate { $predicate = array_merge($this->predicates, $predicate); - return parent::or($predicate); + return parent::or(...$predicate); } diff --git a/src/Predicate/ConstantPredicate.php b/src/Predicate/ConstantPredicate.php index 03e6e70..68eafd7 100644 --- a/src/Predicate/ConstantPredicate.php +++ b/src/Predicate/ConstantPredicate.php @@ -23,7 +23,7 @@ class ConstantPredicate extends AbstractPredicate * * @param bool $value */ - public function __construct(bool $value) + private function __construct(bool $value) { $this->value = $value; } @@ -55,4 +55,14 @@ class ConstantPredicate extends AbstractPredicate { return $this->value; } + + public static function always() + { + return new static(true); + } + + public static function never() + { + return new static(false); + } } \ No newline at end of file diff --git a/src/Predicates/comparisons.php b/src/Predicates/comparisons.php new file mode 100644 index 0000000..6322f22 --- /dev/null +++ b/src/Predicates/comparisons.php @@ -0,0 +1,91 @@ + + * + * Full license available in separate LICENSE file + */ + +namespace Kadet\Functional\Predicates; + +use Kadet\Functional\Predicate; +use function Kadet\Functional\predicate; + +/** + * @param $expected + * + * @return \Kadet\Functional\Predicate + * @throws \Exception + */ +function equals($expected): Predicate +{ + return predicate(function ($value) use ($expected) { + return $expected == $value; + }); +} + +/** + * @param $expected + * + * @return \Kadet\Functional\Predicate + * @throws \Exception + */ +function same($expected): Predicate +{ + return predicate(function ($value) use ($expected) { + return $value === $expected; + }); +} + +/** + * @param $expected + * + * @return \Kadet\Functional\Predicate + * @throws \Exception + */ +function gt($expected): Predicate +{ + return predicate(function ($value) use ($expected) { + return $value > $expected; + }); +} + +/** + * @param $expected + * + * @return \Kadet\Functional\Predicate + * @throws \Exception + */ +function ge($expected): Predicate +{ + return predicate(function ($value) use ($expected) { + return $value >= $expected; + }); +} + +/** + * @param $expected + * + * @return \Kadet\Functional\Predicate + * @throws \Exception + */ +function lt($expected): Predicate +{ + return predicate(function ($value) use ($expected) { + return $value < $expected; + }); +} + +/** + * @param $expected + * + * @return \Kadet\Functional\Predicate + * @throws \Exception + */ +function le($expected): Predicate +{ + return predicate(function ($value) use ($expected) { + return $value <= $expected; + }); +} diff --git a/src/Predicates/index.php b/src/Predicates/index.php new file mode 100644 index 0000000..24d5066 --- /dev/null +++ b/src/Predicates/index.php @@ -0,0 +1,11 @@ + + * + * Full license available in separate LICENSE file + */ + +require_once __DIR__."/comparisons.php"; +require_once __DIR__."/objects.php"; diff --git a/src/Predicates/objects.php b/src/Predicates/objects.php new file mode 100644 index 0000000..e6ecbe7 --- /dev/null +++ b/src/Predicates/objects.php @@ -0,0 +1,57 @@ + + * + * Full license available in separate LICENSE file + */ + +namespace Kadet\Functional\Predicates; + + +use function Kadet\Functional\predicate; +use Kadet\Functional\Predicate\ClosurePredicate; + +/** + * @param string $method + * @param $predicate + * @param array $args + * + * @return \Kadet\Functional\Predicate + */ +function method(string $method, $predicate, ...$args) +{ + $predicate = predicate($predicate); + + return new ClosurePredicate(function ($object) use ($method, $predicate, $args) { + return $predicate($object->{$method}($args)); + }); +} + +/** + * @param string $property + * @param $predicate + * + * @return \Kadet\Functional\Predicate + */ +function property(string $property, $predicate) { + $predicate = predicate($predicate); + + return new ClosurePredicate(function ($object) use ($property, $predicate) { + if (isset($object->$property)) { + return $predicate($object->$property); + } elseif (method_exists($object, $getter = 'get'.ucfirst($property))) { + return $predicate($object->$getter()); + } else { + return false; + } + }); +} + +function instance(string $class) +{ + return new ClosurePredicate(function ($value) use ($class) { + return $value instanceof $class; + }); +} \ No newline at end of file diff --git a/src/functions.php b/src/functions.php index 1030922..ba6f502 100644 --- a/src/functions.php +++ b/src/functions.php @@ -11,20 +11,17 @@ use Kadet\Functional\Predicate\ConstantPredicate; * @param $predicate * * @return \Kadet\Functional\Predicate - * @throws \Exception */ function predicate($predicate): Predicate { - if ($predicate instanceof Predicate) { - return $predicate; + switch (true) { + case $predicate instanceof Predicate: + return $predicate; + case is_callable($predicate): + return new ClosurePredicate(\Closure::fromCallable($predicate)); + default: + throw new \InvalidArgumentException('$predicate is not valid predicate.'); } - - if (is_callable($predicate)) { - return new ClosurePredicate(\Closure::fromCallable($predicate)); - } - - // todo better exception - throw new \Exception(); } function not($predicate) @@ -34,30 +31,29 @@ function not($predicate) function always() { - return new ConstantPredicate(true); + return ConstantPredicate::always(); } function never() { - return new ConstantPredicate(false); + return ConstantPredicate::never(); +} + +function unpack($arguments) +{ + return count($arguments) === 1 && is_array(reset($arguments)) + ? reset($arguments) + : $arguments; } function all(...$predicates) { - // extract array - if (count($predicates) === 1 && is_array($predicates[0])) { - $predicates = $predicates[0]; - } - + $predicates = unpack($predicates); return new AllOfPredicate(...array_map(predicate::class, $predicates)); } function any(...$predicates) { - // extract array - if (count($predicates) === 1 && is_array($predicates[0])) { - $predicates = $predicates[0]; - } - + $predicates = unpack($predicates); return new AnyOfPredicate(...array_map(predicate::class, $predicates)); }