SignpostMarv\DaftInterfaceCollector\StaticMethodCollector

Complexity

Total Complexity

32

Size/Duplication

Total Lines	223
Duplicated Lines	0 %

Test Coverage

Coverage

96.34%

Importance

Changes

0

13 Methods

Rating	Name	Duplication	Size	Complexity
A	Collect()	0	8	2
A	__construct()	0	23	2
A	FilterArrayOfInterfaces()	0	5	1
A	FilterIsA()	0	4	1
B	CollectInterfacesFromImplementation()	0	26	6
B	CollectInterfaces()	0	26	6
A	FilterNonZeroArray()	0	6	1
A	FilterArrayOfInterfaceOffsets()	0	8	1
A	FilterMethods()	0	15	1
A	MakeMethodFilter()	0	8	2
A	FilterReflectionMethod()	0	7	4
A	FilterReflectionReturnType()	0	5	3
A	FilterArrayOfInterfacesOrClasses()	0	9	2

<?php

declare(strict_types=1);
/**
* @author SignpostMarv
*/

namespace SignpostMarv\DaftInterfaceCollector;

use Closure;
use Generator;
use ReflectionClass;
use ReflectionMethod;
use ReflectionType;
use Traversable;

class StaticMethodCollector
{
    /**
    * @var array<string, array<string, string[]>>
    */
    private $staticMethods = [];

    /**
    * @var string[]
    */
    private $interfaces = [];

    /**
    * @var array<int, string>
    */
    private $processedSources = [];

    /**
    * @var string[]
    */
    private $alreadyYielded = [];

    /**
    * @var bool
    */
    private $autoReset;

    public function __construct(array $staticMethods, array $interfaces, bool $autoReset = true)
    {
        $filteredMethods = [];

        foreach ($this->FilterArrayOfInterfaceOffsets($staticMethods) as $interface => $methods) {
            $filteredMethods[$interface] = $this->FilterMethods($interface, $methods);
        }

        /**
        * @var array<string, array<string, string[]>> $filteredMethods
        */
        $filteredMethods = $this->FilterNonZeroArray($filteredMethods);

        $this->staticMethods = $filteredMethods;

        /**
        * @var string[] $filteredInterfaces
        */
        $filteredInterfaces = $this->FilterArrayOfInterfacesOrClasses($interfaces);

        $this->interfaces = $filteredInterfaces;

        $this->autoReset = $autoReset;
    }

    public function Collect(string ...$implementations) : Generator
    {
        if ($this->autoReset) {
            $this->processedSources = [];
            $this->alreadyYielded = [];
        }

        yield from $this->CollectInterfaces(...$implementations);
    }

    protected function CollectInterfaces(string ...$implementations) : Generator
    {
        foreach (
            array_filter(
                $implementations,
                function (string $implementation) : bool {
                    return
                        class_exists($implementation) &&
                        ! in_array($implementation, $this->processedSources, true);
                }
            ) as $implementation
        ) {
            $this->processedSources[] = $implementation;

            foreach ($this->interfaces as $interface) {
                if (
                    ! in_array($implementation, $this->alreadyYielded, true) &&
                    is_a($implementation, $interface, true)
                ) {
                    yield $implementation;
                    $this->alreadyYielded[] = $implementation;
                    break;
                }
            }

            yield from $this->CollectInterfacesFromImplementation($implementation);
        }
    }

    private function CollectInterfacesFromImplementation(string $implementation) : Generator
    {
        $interfaces = array_keys($this->staticMethods);
        /**
        * @var string $interface
        */
        foreach ($this->FilterIsA($implementation, $interfaces) as $interface) {
            foreach ($this->staticMethods[$interface] as $method => $types) {
                /**
                * @var iterable<string> $methodResult
                */
                $methodResult = $implementation::$method();

                foreach ($methodResult as $result) {
                    if (in_array($result, $this->alreadyYielded, true)) {
                        continue;
                    }
                    /**
                    * @var string $type
                    */
                    foreach ($this->FilterIsA($result, $types) as $type) {
                        yield $result;
                        $this->alreadyYielded[] = $result;
                    }

                    yield from $this->CollectInterfaces($result);
                }
            }
        }
    }

    private function FilterIsA(string $implementation, array $interfaces) : array
    {
        return array_filter($interfaces, function (string $interface) use ($implementation) : bool {
            return is_a($implementation, $interface, true);
        });
    }

    /**
    * @return string[]|array<string, mixed>
    */
    private function FilterArrayOfInterfaces(array $interfaces, int $flag = 0) : array
    {
        $strings = array_filter($interfaces, 'is_string', $flag);

        return array_filter($strings, 'interface_exists', $flag);
    }

    /**
    * @return string[]
    */
    private function FilterArrayOfInterfacesOrClasses(array $interfaces) : array
    {
        /**
        * @var string[] $strings
        */
        $strings = array_filter($interfaces, 'is_string');

        return array_filter($strings, function (string $maybe) : bool {
            return interface_exists($maybe) || class_exists($maybe);
        });
    }

    /**
    * @return array<string, array>
    */
    private function FilterArrayOfInterfaceOffsets(array $interfaces) : array
    {
        /**
        * @var array<string, array> $strings
        */
        $strings = $this->FilterArrayOfInterfaces($interfaces, ARRAY_FILTER_USE_KEY);

        return array_filter($strings, 'is_array');
    }

    private function MakeMethodFilter(string $interface) : Closure
    {
        return function (string $maybe) use ($interface) : bool {
            $ref = new ReflectionClass($interface);

            return
                $ref->hasMethod($maybe) &&
                $this->FilterReflectionMethod($ref->getMethod($maybe));
        };
    }

    private function FilterReflectionMethod(ReflectionMethod $refMethod) : bool
    {
        return
            $refMethod->isStatic() &&
            $refMethod->isPublic() &&
            0 === $refMethod->getNumberOfRequiredParameters() &&
            $this->FilterReflectionReturnType($refMethod->getReturnType());
    }

    private function FilterReflectionReturnType(? ReflectionType $refReturn) : bool
    {
        $refReturnName = is_null($refReturn) ? '' : $refReturn->__toString();

The function ReflectionType::__toString() has been deprecated: 7.1.0:8.0.0 Please use getName()

        return 'array' === $refReturnName || is_a($refReturnName, Traversable::class, true);
    }

    /**
    * @return array<string, string[]>
    */
    private function FilterMethods(string $interface, array $methods) : array
    {
        /**
        * @var array<string, string[]>
        */
        $filteredMethods = $this->FilterNonZeroArray(array_map(
            [$this, 'FilterArrayOfInterfacesOrClasses'],
            array_filter(
                array_filter($methods, 'is_string', ARRAY_FILTER_USE_KEY),
                $this->MakeMethodFilter($interface),
                ARRAY_FILTER_USE_KEY
            )
        ));

        return $filteredMethods;
    }

    /**
    * @var array[]
    */
    private function FilterNonZeroArray(array $in) : array
    {
        return array_filter(
            $in,
            function (array $val) : bool {
                return count($val) > 0;
            }
        );
    }
}