SourceArgumentsReader.php

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<?php
namespace Magento\Framework\Code\Reader;

class SourceArgumentsReader
{
    const NS_SEPARATOR = '\\';

    private $namespaceResolver;

    public function __construct(NamespaceResolver $namespaceResolver = null)
    {
        $this->namespaceResolver = $namespaceResolver ?: new NamespaceResolver();
    }

    public function getConstructorArgumentTypes(
        \ReflectionClass $class,
        $inherited = false
    ) {
        $output = [null];
        if (!$class->getFileName() || false == $class->hasMethod(
            '__construct'
        ) || !$inherited && $class->getConstructor()->class !== $class->getName()
        ) {
            return $output;
        }

        //Reading parameters' types.
        $params = $class->getConstructor()->getParameters();
        $types = [];
        foreach ($params as $param) {
            //For the sake of backward compatibility.
            $typeName = '';
            if ($param->isArray()) {
                //For the sake of backward compatibility.
                $typeName = 'array';
            } else {
                try {
                    $paramClass = $param->getClass();
                    if ($paramClass) {
                        $typeName = '\\' .$paramClass->getName();
                    }
                } catch (\ReflectionException $exception) {
                    //If there's a problem loading a class then ignore it and
                    //just return it's name.
                    $typeName = '\\' .$param->getType()->getName();
                }
            }
            $types[] = $typeName;
        }
        if (!$types) {
            //For the sake of backward compatibility.
            $types = [null];
        }

        return $types;
    }

    protected function resolveNamespaces($argument, $availableNamespaces)
    {
        return $this->namespaceResolver->resolveNamespace($argument, $availableNamespaces);
    }

    protected function removeToken($argument, $token)
    {
        $position = strpos($argument, $token);
        if (is_numeric($position)) {
            return substr($argument, 0, $position);
        }
        return $argument;
    }

    protected function getImportedNamespaces(array $file)
    {
        return $this->namespaceResolver->getImportedNamespaces($file);
    }
}