Resolver::__construct() - Code Metrics - Inspection of "Merge pull request #5 from benrowe/feature/find-cl..." - benrowe/fqcn - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( e1c890...c13eee )

by Ben

created 2017-03-27 00:26 UTC

Resolver::__construct() A

↳ Parent: Resolver

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	1
eloc	2
nc	1
nop	1

<?php

declare(strict_types=1);

namespace Benrowe\Fqcn;

use Composer\Autoload\ClassLoader;

/**
 * Resolver
 * Resolve a php psr4 namespace to a directory
 *
 * @package Benrowe\Fqcn
 */
class Resolver
{
    /**
     * Instance of composer, since this will be used to load the ps4 prefixes
     *
     * @var ClassLoader
     */
    private $composer;

    /**
     * Resolver constructor.
     *
     * @param ClassLoader $composer
     */
    public function __construct(ClassLoader $composer)
    {
        $this->composer = $composer;
    }

    /**
     * Find all of the avaiable classes under a specific namespace
     *
     * @param  string $namespace  The namespace to search for
     * @param  string $instanceOf optional, restrict the classes found to those
     *                            that extend from this base
     * @return array a list of FQCN's that match
     */
    public function findClasses(string $namespace, string $instanceOf = null): array
    {
        $availablePaths = $this->resolveDirectory($namespace);

        $classes = [];
        foreach ($availablePaths as $path) {
            foreach ($this->getDirectoryIterator($path) as $file) {
                $fqcn = $namespace.strtr(substr($file[0], strlen($path), -4), '//', '\\');
                try {
                    // test if the class exists
                    new \ReflectionClass($fqcn);
                    $classes[] = $fqcn;
                } catch (\ReflectionException $e) {
                    // could not load the class/interface/trait
                }
            }
        }

        sort($classes);

        if ($instanceOf) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
            $classes = array_values(array_filter($classes, function ($className) use ($instanceOf) {
                return is_subclass_of($className, $instanceOf);
            }));
        }

        return $classes;
    }

    /**
     * Resolve a psr4 based namespace to an absolute directory
     *
     * @param string $namespace
     * @return array
     * @throws Exception
     */
    public function resolveDirectory(string $namespace): array
    {
        $namespace = $this->normalise($namespace);

        $prefixes = $this->composer->getPrefixesPsr4();
        $prefix   = $this->findPrefix($namespace, array_keys($prefixes));
        if (!$prefix) {
            throw new Exception('Could not find registered psr4 prefix that matches '.$namespace);
        }

        $discovered = [];
        foreach ($prefixes[$prefix] as $path) {
            $path = $this->findAbsolutePathForPsr4($namespace, $prefix, $path);
            // convert the rest of the relative path, from the prefix into a directory slug
            if ($path && is_dir($path)) {
                $discovered[] =  $path;
            }
        }
        return $discovered;
    }

    /**
     * Find the best psr4 namespace prefix, based on the supplied namespace, and
     * list of provided prefix
     *
     * @param string $namespace
     * @param array  $prefixes
     * @return string
     */
    private function findPrefix(string $namespace, array $prefixes): string
    {
        $prefixResult = '';

        // find the best matching prefix!
        foreach ($prefixes as $prefix) {
            // if we have a match, and it's longer than the previous match
            if (substr($namespace, 0, strlen($prefix)) == $prefix &&
                strlen($prefix) > strlen($prefixResult)
            ) {
                $prefixResult = $prefix;
            }
        }
        return $prefixResult;
    }

    /**
     * Convert the supplied namespace string into a standard format
     * no prefix, ends with trailing slash
     *
     * Example:
     * Psr4\Prefix\
     * Something\
     *
     * @param string $namespace
     * @return string
     * @throws Exception
     */
    private function normalise(string $namespace): string
    {
        $tidy = trim($namespace, '\\');
        if (!$tidy) {
            throw new Exception('Invalid namespace', 100);
        }

        return $tidy . '\\';
    }

    /**
     * Get an absolute path for the provided namespace, based on a existing
     * directory and its psr4 prefix
     *
     * @param string $namespace
     * @param string $psr4Prefix the psr4 prefix
     * @param string $psr4Path and it's related path
     * @return string the absolute directory path the provided namespace, given
     *                    the correct prefix and path empty string if path can't
     *                    be resolved
     */
    private function findAbsolutePathForPsr4(string $namespace, string $psr4Prefix, string $psr4Path): string
    {
        $relFqn = trim(substr($namespace, strlen($psr4Prefix)), '\\/');
        $path =
            $psr4Path .
            DIRECTORY_SEPARATOR .
            strtr($relFqn, [
                '\\' => DIRECTORY_SEPARATOR,
                '//' => DIRECTORY_SEPARATOR
            ]);
        $path = realpath($path);

        return $path ?: '';
    }


    /**
     * Retrieve a directory iterator for the supplied path
     *
     * @param  string $path The directory to iterate
     * @return \RegexIterator
     */
    private function getDirectoryIterator(string $path): \RegexIterator
    {
        $dirIterator = new \RecursiveDirectoryIterator($path);
        $iterator = new \RecursiveIteratorIterator($dirIterator);
        return new \RegexIterator($iterator, '/^.+\.php$/i', \RecursiveRegexIterator::GET_MATCH);
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			namespace Benrowe\Fqcn;
6
7			use Composer\Autoload\ClassLoader;
8
9			/**
10			* Resolver
11			* Resolve a php psr4 namespace to a directory
12			*
13			* @package Benrowe\Fqcn
14			*/
15			class Resolver
16			{
17			/**
18			* Instance of composer, since this will be used to load the ps4 prefixes
19			*
20			* @var ClassLoader
21			*/
22			private $composer;
23
24			/**
25			* Resolver constructor.
26			*
27			* @param ClassLoader $composer
28			*/
29			public function __construct(ClassLoader $composer)
30			{
31			$this->composer = $composer;
32			}
33
34			/**
35			* Find all of the avaiable classes under a specific namespace
36			*
37			* @param string $namespace The namespace to search for
38			* @param string $instanceOf optional, restrict the classes found to those
39			* that extend from this base
40			* @return array a list of FQCN's that match
41			*/
42			public function findClasses(string $namespace, string $instanceOf = null): array
43			{
44			$availablePaths = $this->resolveDirectory($namespace);
45
46			$classes = [];
47			foreach ($availablePaths as $path) {
48			foreach ($this->getDirectoryIterator($path) as $file) {
49			$fqcn = $namespace.strtr(substr($file[0], strlen($path), -4), '//', '\\');
50			try {
51			// test if the class exists
52			new \ReflectionClass($fqcn);
53			$classes[] = $fqcn;
54			} catch (\ReflectionException $e) {
55			// could not load the class/interface/trait
56			}
57			}
58			}
59
60			sort($classes);
61
62			if ($instanceOf) {
			0 ignored issues – show Bug Best Practice introduced 2017-03-27 00:37 UTC by Report Bug Copy Issue Report The expression `$instanceOf` of type `null\|string` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
63			$classes = array_values(array_filter($classes, function ($className) use ($instanceOf) {
64			return is_subclass_of($className, $instanceOf);
65			}));
66			}
67
68			return $classes;
69			}
70
71			/**
72			* Resolve a psr4 based namespace to an absolute directory
73			*
74			* @param string $namespace
75			* @return array
76			* @throws Exception
77			*/
78			public function resolveDirectory(string $namespace): array
79			{
80			$namespace = $this->normalise($namespace);
81
82			$prefixes = $this->composer->getPrefixesPsr4();
83			$prefix = $this->findPrefix($namespace, array_keys($prefixes));
84			if (!$prefix) {
85			throw new Exception('Could not find registered psr4 prefix that matches '.$namespace);
86			}
87
88			$discovered = [];
89			foreach ($prefixes[$prefix] as $path) {
90			$path = $this->findAbsolutePathForPsr4($namespace, $prefix, $path);
91			// convert the rest of the relative path, from the prefix into a directory slug
92			if ($path && is_dir($path)) {
93			$discovered[] = $path;
94			}
95			}
96			return $discovered;
97			}
98
99			/**
100			* Find the best psr4 namespace prefix, based on the supplied namespace, and
101			* list of provided prefix
102			*
103			* @param string $namespace
104			* @param array $prefixes
105			* @return string
106			*/
107			private function findPrefix(string $namespace, array $prefixes): string
108			{
109			$prefixResult = '';
110
111			// find the best matching prefix!
112			foreach ($prefixes as $prefix) {
113			// if we have a match, and it's longer than the previous match
114			if (substr($namespace, 0, strlen($prefix)) == $prefix &&
115			strlen($prefix) > strlen($prefixResult)
116			) {
117			$prefixResult = $prefix;
118			}
119			}
120			return $prefixResult;
121			}
122
123			/**
124			* Convert the supplied namespace string into a standard format
125			* no prefix, ends with trailing slash
126			*
127			* Example:
128			* Psr4\Prefix\
129			* Something\
130			*
131			* @param string $namespace
132			* @return string
133			* @throws Exception
134			*/
135			private function normalise(string $namespace): string
136			{
137			$tidy = trim($namespace, '\\');
138			if (!$tidy) {
139			throw new Exception('Invalid namespace', 100);
140			}
141
142			return $tidy . '\\';
143			}
144
145			/**
146			* Get an absolute path for the provided namespace, based on a existing
147			* directory and its psr4 prefix
148			*
149			* @param string $namespace
150			* @param string $psr4Prefix the psr4 prefix
151			* @param string $psr4Path and it's related path
152			* @return string the absolute directory path the provided namespace, given
153			* the correct prefix and path empty string if path can't
154			* be resolved
155			*/
156			private function findAbsolutePathForPsr4(string $namespace, string $psr4Prefix, string $psr4Path): string
157			{
158			$relFqn = trim(substr($namespace, strlen($psr4Prefix)), '\\/');
159			$path =
160			$psr4Path .
161			DIRECTORY_SEPARATOR .
162			strtr($relFqn, [
163			'\\' => DIRECTORY_SEPARATOR,
164			'//' => DIRECTORY_SEPARATOR
165			]);
166			$path = realpath($path);
167
168			return $path ?: '';
169			}
170
171
172			/**
173			* Retrieve a directory iterator for the supplied path
174			*
175			* @param string $path The directory to iterate
176			* @return \RegexIterator
177			*/
178			private function getDirectoryIterator(string $path): \RegexIterator
179			{
180			$dirIterator = new \RecursiveDirectoryIterator($path);
181			$iterator = new \RecursiveIteratorIterator($dirIterator);
182			return new \RegexIterator($iterator, '/^.+\.php$/i', \RecursiveRegexIterator::GET_MATCH);
183			}
184			}
185

benrowe / fqcn

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Resolver::__construct() A

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