Injector::resolveObjectParameter() - Code Metrics - Inspection of "Customization of identifier template" - yiisoft/injector - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#32)

by Aleksei
created 2020-11-11 21:45 UTC
Injector::resolveObjectParameter() B

↳ Parent: Injector
Complexity

Conditions	7
Paths	5
Size

Total Lines	29
Code Lines	21
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	0
CRAP Score	56
Importance

Changes	1
Bugs	0	Features	0
Metric	Value
cc	7
eloc	21
c	1
b	0
f	0
nc	5
nop	3
dl	0
loc	29
ccs	0
cts	0
cp	0
crap	56
rs	8.6506
<?php

declare(strict_types=1);

namespace Yiisoft\Injector;

use Closure;
use Psr\Container\ContainerExceptionInterface;
use Psr\Container\ContainerInterface;
use Psr\Container\NotFoundExceptionInterface;
use ReflectionClass;
use ReflectionException;
use ReflectionFunction;
use ReflectionFunctionAbstract;
use ReflectionNamedType;
use ReflectionParameter;

/**
 * Injector is able to analyze callable dependencies based on type hinting and
 * inject them from any PSR-11 compatible container.
 */
final class Injector
{
    public const TEMPLATE_PARAM_CLASS = '{paramClass}';
    public const TEMPLATE_PARAM_NAME = '{paramName}';
    public const TEMPLATE_PARAM_POS = '{paramPos}';
    public const TEMPLATE_CLASS = '{class}';
    public const TEMPLATE_METHOD = '{functionName}';
    public const TEMPLATE_NAMESPACE = '{namespace}';

    private ContainerInterface $container;
    /** @var string[] */
    private array $idTemplates = [self::TEMPLATE_PARAM_CLASS];

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    /**
     * todo comment
     */
    public function withIdTemplates(string ...$templates): self
    {
        if (count($templates) === 0) {
            throw new \InvalidArgumentException('Template list cannot be empty.');
        }
        $new = clone $this;
        $new->idTemplates = $templates;
        return $new;
    }

    /**
     * Invoke a callback with resolving dependencies based on parameter types.
     *
     * This methods allows invoking a callback and let type hinted parameter names to be
     * resolved as objects of the Container. It additionally allow calling function passing named arguments.
     *
     * For example, the following callback may be invoked using the Container to resolve the formatter dependency:
     *
     * ```php
     * $formatString = function($string, \Yiisoft\I18n\MessageFormatterInterface $formatter) {
     *    // ...
     * }
     *
     * $injector = new Yiisoft\Injector\Injector($container);
     * $injector->invoke($formatString, ['string' => 'Hello World!']);
     * ```
     *
     * This will pass the string `'Hello World!'` as the first argument, and a formatter instance created
     * by the DI container as the second argument.
     *
     * @param callable $callable callable to be invoked.
     * @param array $arguments The array of the function arguments.
     * This can be either a list of arguments, or an associative array where keys are argument names.
     * @return mixed the callable return value.
     * @throws MissingRequiredArgumentException if required argument is missing.
     * @throws ContainerExceptionInterface if a dependency cannot be resolved or if a dependency cannot be fulfilled.
     * @throws ReflectionException
     */
    public function invoke(callable $callable, array $arguments = [])
    {
        $callable = Closure::fromCallable($callable);
        $reflection = new ReflectionFunction($callable);
        return $reflection->invokeArgs($this->resolveDependencies($reflection, $arguments));
    }

    /**
     * Creates an object of a given class with resolving constructor dependencies based on parameter types.
     *
     * This methods allows invoking a constructor and let type hinted parameter names to be
     * resolved as objects of the Container. It additionally allow calling constructor passing named arguments.
     *
     * For example, the following constructor may be invoked using the Container to resolve the formatter dependency:
     *
     * ```php
     * class StringFormatter
     * {
     *     public function __construct($string, \Yiisoft\I18n\MessageFormatterInterface $formatter)
     *     {
     *         // ...
     *     }
     * }
     *
     * $injector = new Yiisoft\Injector\Injector($container);
     * $stringFormatter = $injector->make(StringFormatter::class, ['string' => 'Hello World!']);
     * ```
     *
     * This will pass the string `'Hello World!'` as the first argument, and a formatter instance created
     * by the DI container as the second argument.
     *
     * @param string $class name of the class to be created.
     * @param array $arguments The array of the function arguments.
     * This can be either a list of arguments, or an associative array where keys are argument names.
     * @return mixed object of the given class.
     * @throws ContainerExceptionInterface
     * @throws MissingRequiredArgumentException|InvalidArgumentException
     * @throws ReflectionException
     */
    public function make(string $class, array $arguments = [])
    {
        $classReflection = new ReflectionClass($class);
        if (!$classReflection->isInstantiable()) {
            throw new \InvalidArgumentException("Class $class is not instantiable.");
        }
        $reflection = $classReflection->getConstructor();
        if ($reflection === null) {
            // Method __construct() does not exist
            return new $class();
        }

        return new $class(...$this->resolveDependencies($reflection, $arguments));
    }

    /**
     * Resolve dependencies for the given function reflection object and a list of concrete arguments
     * and return array of arguments to call the function with.
     *
     * @param ReflectionFunctionAbstract $reflection function reflection.
     * @param array $arguments concrete arguments.
     * @return array resolved arguments.
     * @throws ContainerExceptionInterface
     * @throws MissingRequiredArgumentException|InvalidArgumentException
     * @throws ReflectionException
     */
    private function resolveDependencies(ReflectionFunctionAbstract $reflection, array $arguments = []): array
    {
        $state = new ResolvingState($reflection, $arguments);

        $isInternalOptional = false;
        $internalParameter = '';
        foreach ($reflection->getParameters() as $parameter) {
            if ($isInternalOptional) {
                // Check custom parameter definition for an internal function
                if ($state->hasNamedArgument($parameter->getName())) {
                    throw new MissingInternalArgumentException($reflection, $internalParameter);
                }
                continue;
            }
            // Resolve parameter
            $resolved = $this->resolveParameter($parameter, $state);
            if ($resolved === true) {
                continue;
            }

            if ($resolved === false) {
                throw new MissingRequiredArgumentException($reflection, $parameter->getName());
            }
            // Internal function. Parameter not resolved
            $isInternalOptional = true;
            $internalParameter = $parameter->getName();
        }

        return $state->getResolvedValues();
    }

    /**
     * @param ReflectionParameter $parameter
     * @param ResolvingState $state
     * @return null|bool True if argument resolved; False if not resolved; Null if parameter is optional but without
     * default value in a Reflection object. This is possible for internal functions.
     * @throws NotFoundExceptionInterface
     * @throws ReflectionException
     */
    private function resolveParameter(ReflectionParameter $parameter, ResolvingState $state): ?bool
    {
        $name = $parameter->getName();
        $isVariadic = $parameter->isVariadic();
        $hasType = $parameter->hasType();
        $state->disablePushTrailingArguments($isVariadic && $hasType);

        // Try to resolve parameter by name
        if ($state->resolveParameterByName($name, $isVariadic)) {
            return true;
        }

        $error = null;

        if ($hasType) {
            $reflectionType = $parameter->getType();

            // $reflectionType may be instance of ReflectionUnionType (php8)
            /** @phan-suppress-next-line PhanUndeclaredMethod */
            $types = $reflectionType instanceof ReflectionNamedType ? [$reflectionType] : $reflectionType->getTypes();
            $types = $reflectionType instanceof ReflectionNamedType ? [$reflectionType] : $reflectionType->/** @scrutinizer ignore-call */ getTypes();
            foreach ($types as $namedType) {
                try {
                    if ($this->resolveNamedType($state, $parameter, $namedType)) {
                        return true;
                    }
                } catch (NotFoundExceptionInterface $e) {
                    $error = $e;
                }
            }
        }

        if ($parameter->isDefaultValueAvailable()) {
            $argument = $parameter->getDefaultValue();
            $state->addResolvedValue($argument);
            return true;
        }

        if (!$parameter->isOptional()) {
            if ($hasType && $parameter->allowsNull()) {
                $argument = null;
                $state->addResolvedValue($argument);
                return true;
            }

            if ($error === null) {
                return false;
            }

            // Throw container exception
            throw $error;
        }

        if ($isVariadic) {
            return true;
        }
        return null;
    }

    /**
     * @param ResolvingState $state
     * @param ReflectionParameter $parameter
     * @param ReflectionNamedType $namedType
     * @param bool $isVariadic
     * @return bool True if argument was resolved
     */
    private function resolveNamedType(
        ResolvingState $state,
        ReflectionParameter $parameter,
        ReflectionNamedType $namedType
    ): bool {
        $type = $namedType->getName();
        $class = $namedType->isBuiltin() ? null : $type;
        $isClass = $class !== null || $type === 'object';
        return $isClass && $this->resolveObjectParameter($state, $parameter, $class);
    }

    /**
     * @param ResolvingState $state
     * @param ReflectionParameter $parameter
     * @param null|string $class
     * @return bool True if argument resolved
     */
    private function resolveObjectParameter(ResolvingState $state, ReflectionParameter $parameter, ?string $class): bool
    {
        $isVariadic = $parameter->isVariadic();
        $found = $state->resolveParameterByClass($class, $isVariadic);
        if ($found || $isVariadic) {
            return $found;
        }
        if ($class !== null) {
            $toReplace = $state->getDataToTemplate() + [
                self::TEMPLATE_PARAM_CLASS => $class,
                self::TEMPLATE_PARAM_NAME => $parameter->getName(),
                self::TEMPLATE_PARAM_POS => (string) $parameter->getPosition(),
            ];
            $left = count($this->idTemplates);
            foreach ($this->idTemplates as $template) {
                try {
                    --$left;
                    $argument = $this->container->get(strtr($template, $toReplace));
                    break;
                } catch (NotFoundExceptionInterface $e) {
                    if ($left === 0) {
                        throw $e;
                    }
                }
            }
            $state->addResolvedValue($argument);
            return true;
        }
        return false;
    }
}

yiisoft / injector

Pull Request — master (#32)

Injector::resolveObjectParameter() B

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