ClosureExporter::export() - Code Metrics - Inspection of "Add export objects with closures" - yiisoft/var-dumper - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#54)

by Dmitriy

created 2021-04-06 23:50 UTC

ClosureExporter::export() F

↳ Parent: ClosureExporter

Complexity

Conditions	29
Paths	150

Size

Total Lines	76
Code Lines	50

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	47
CRAP Score	29.4052

Importance

Changes	2
Bugs	1	Features	0

Metric	Value
cc	29
eloc	50
c	2
b	1
f	0
nc	150
nop	2
dl	0
loc	76
ccs	47
cts	51
cp	0.9216
crap	29.4052
rs	3.75

How to fix Long Method Complexity

<?php

declare(strict_types=1);

namespace Yiisoft\VarDumper;

use Closure;
use ReflectionException;
use ReflectionFunction;

use function array_filter;
use function array_pop;
use function array_shift;
use function array_slice;
use function explode;
use function file;
use function implode;
use function in_array;
use function is_array;
use function is_string;
use function mb_strlen;
use function mb_substr;
use function strpos;
use function token_get_all;
use function trim;

/**
 * ClosureExporter exports PHP {@see \Closure} as a string containing PHP code.
 *
 * The string is a valid PHP expression that can be evaluated by PHP parser
 * and the evaluation result will give back the closure instance.
 */
final class ClosureExporter
{
    private UseStatementParser $useStatementParser;

    public function __construct()
    {
        $this->useStatementParser = new UseStatementParser();
    }

    /**
     * Export closure as a string containing PHP code.
     *
     * @param Closure $closure Closure to export.
     *
     * @param int $level Level for padding.
     *
     * @throws ReflectionException
     *
     * @return string String containing PHP code.
     */
    public function export(Closure $closure, int $level = 0): string
    {
        $reflection = new ReflectionFunction($closure);

        $fileName = $reflection->getFileName();
        $start = $reflection->getStartLine();
        $end = $reflection->getEndLine();

        if ($fileName === false || $start === false || $end === false || ($fileContent = file($fileName)) === false) {
            return 'function () {/* Error: unable to determine Closure source */}';
        }

        --$start;
        $uses = $this->useStatementParser->fromFile($fileName);
        $tokens = token_get_all('<?php ' . implode('', array_slice($fileContent, $start, $end - $start)));
        array_shift($tokens);

        $bufferUse = '';
        $closureTokens = [];
        $pendingParenthesisCount = 0;

        foreach ($tokens as $i => $token) {
            if (in_array($token[0], [T_FUNCTION, T_FN, T_STATIC], true)) {
                $closureTokens[] = $token[1];
                continue;
            }

            if ($closureTokens === []) {
                continue;
            }

            $readableToken = is_array($token) ? $token[1] : $token;

            if ($this->useStatementParser->isTokenIsPartOfUse($token)) {
                if ($this->isUseConsistingOfMultipleParts($readableToken)) {
                    $readableToken = $this->processFullUse($readableToken, $uses);
                    $bufferUse = '';
                } elseif (isset($uses[$readableToken])) {
                    if (isset($tokens[$i + 1]) && $this->useStatementParser->isTokenIsPartOfUse($tokens[$i + 1])) {
                        $bufferUse .= $uses[$readableToken];
                        continue;
                    }
                    $readableToken = $uses[$readableToken];
                } elseif ($readableToken === '\\' && isset($tokens[$i - 1][1]) && $tokens[$i - 1][1] === '\\') {
                    continue;
                } elseif (isset($tokens[$i + 1]) && $this->useStatementParser->isTokenIsPartOfUse($tokens[$i + 1])) {
                    $bufferUse .= $readableToken;
                    continue;
                }
                if (!empty($bufferUse)) {
                    if ($bufferUse !== $readableToken && strpos($readableToken, $bufferUse) === false) {
                        $readableToken = $bufferUse . $readableToken;
                    }
                    $bufferUse = '';
                }
            }

            if (is_string($token)) {
                if ($this->isOpenParenthesis($token)) {
                    $pendingParenthesisCount++;
                } elseif ($this->isCloseParenthesis($token)) {
                    if ($pendingParenthesisCount === 0) {
                        break;
                    }
                    $pendingParenthesisCount--;
                } elseif ($token === ',' || $token === ';') {
                    if ($pendingParenthesisCount === 0) {
                        break;
                    }
                }
            }

            $closureTokens[] = $readableToken;
        }

        return $this->formatClosure(implode('', $closureTokens), $level);
    }

    private function formatClosure(string $code, int $level): string
    {
        if ($level <= 0) {
            return $code;
        }
        $spaces = str_repeat(' ', ($level -1) * 4);
        $lines = explode("\n", $code);

        foreach ($lines as $index => $line) {
            if ($index === 0) {
                continue;
            }
            $lines[$index] = $spaces . $line;
        }

        return rtrim(implode('', $lines), "\n");
    }

    /**
     * Returns the last part from the use statement data.
     *
     * @param string $use The full use statement data.
     *
     * @return string The last part from the use statement data.
     */
    private function getUseLastPart(string $use): string
    {
        $parts = array_filter(explode('\\', $use));
        return (string) array_pop($parts);
    }

    /**
     * Processes and returns the full use statement data.
     *
     * @param string $use The use statement data to process.
     * @param array<string, string> $uses The use statement data.
     *
         * @return string The processed full use statement.
     */
    private function processFullUse(string $use, array $uses): string
    {
        $lastPart = $this->getUseLastPart($use);

        if (isset($uses[$lastPart])) {
            return $uses[$lastPart];
        }

        $result = '';

        do {
            $lastPart = $this->getUseLastPart($use);
            $use = mb_substr($use, 0, -mb_strlen("\\{$lastPart}"));
            $result = ($uses[$lastPart] ?? $lastPart) . '\\' . $result;
        } while (!empty($lastPart) && !isset($uses[$lastPart]));

        return '\\' . trim($result, '\\');
    }

    /**
     * Checks whether the use statement data consists of multiple parts.
     *
     * @param string $use The use statement data.
     *
     * @return bool Whether the use statement data consists of multiple parts.
     */
    private function isUseConsistingOfMultipleParts(string $use): bool
    {
        return $use !== '\\' && strpos($use, '\\') !== false;
    }

    /**
     * Checks whether the value of the token is an opening parenthesis.
     *
     * @param string $value The token value.
     *
     * @return bool Whether the value of the token is an opening parenthesis.
     */
    private function isOpenParenthesis(string $value): bool
    {
        return in_array($value, ['{', '[', '(']);
    }

    /**
     * Checks whether the value of the token is a closing parenthesis.
     *
     * @param string $value The token value.
     *
     * @return bool Whether the value of the token is a closing parenthesis.
     */
    private function isCloseParenthesis(string $value): bool
    {
        return in_array($value, ['}', ']', ')']);
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Yiisoft\VarDumper;
6
7		use Closure;
8		use ReflectionException;
9		use ReflectionFunction;
10
11		use function array_filter;
12		use function array_pop;
13		use function array_shift;
14		use function array_slice;
15		use function explode;
16		use function file;
17		use function implode;
18		use function in_array;
19		use function is_array;
20		use function is_string;
21		use function mb_strlen;
22		use function mb_substr;
23		use function strpos;
24		use function token_get_all;
25		use function trim;
26
27		/**
28		* ClosureExporter exports PHP {@see \Closure} as a string containing PHP code.
29		*
30		* The string is a valid PHP expression that can be evaluated by PHP parser
31		* and the evaluation result will give back the closure instance.
32		*/
33		final class ClosureExporter
34		{
35		private UseStatementParser $useStatementParser;
36
37	10	public function __construct()
38		{
39	10	$this->useStatementParser = new UseStatementParser();
40	10	}
41
42		/**
43		* Export closure as a string containing PHP code.
44		*
45		* @param Closure $closure Closure to export.
46		*
47		* @param int $level Level for padding.
48		*
49		* @throws ReflectionException
50		*
51		* @return string String containing PHP code.
52		*/
53	44	public function export(Closure $closure, int $level = 0): string
54		{
55	44	$reflection = new ReflectionFunction($closure);
56
57	44	$fileName = $reflection->getFileName();
58	44	$start = $reflection->getStartLine();
59	44	$end = $reflection->getEndLine();
60
61	44	if ($fileName === false \|\| $start === false \|\| $end === false \|\| ($fileContent = file($fileName)) === false) {
62		return 'function () {/* Error: unable to determine Closure source */}';
63		}
64
65	44	--$start;
66	44	$uses = $this->useStatementParser->fromFile($fileName);
67	44	$tokens = token_get_all('<?php ' . implode('', array_slice($fileContent, $start, $end - $start)));
68	44	array_shift($tokens);
69
70	44	$bufferUse = '';
71	44	$closureTokens = [];
72	44	$pendingParenthesisCount = 0;
73
74	44	foreach ($tokens as $i => $token) {
75	44	if (in_array($token[0], [T_FUNCTION, T_FN, T_STATIC], true)) {
76	44	$closureTokens[] = $token[1];
77	44	continue;
78		}
79
80	44	if ($closureTokens === []) {
81	44	continue;
82		}
83
84	44	$readableToken = is_array($token) ? $token[1] : $token;
85
86	44	if ($this->useStatementParser->isTokenIsPartOfUse($token)) {
87	30	if ($this->isUseConsistingOfMultipleParts($readableToken)) {
88		$readableToken = $this->processFullUse($readableToken, $uses);
89		$bufferUse = '';
90	30	} elseif (isset($uses[$readableToken])) {
91	17	if (isset($tokens[$i + 1]) && $this->useStatementParser->isTokenIsPartOfUse($tokens[$i + 1])) {
92	5	$bufferUse .= $uses[$readableToken];
93	5	continue;
94		}
95	17	$readableToken = $uses[$readableToken];
96	21	} elseif ($readableToken === '\\' && isset($tokens[$i - 1][1]) && $tokens[$i - 1][1] === '\\') {
97		continue;
98	21	} elseif (isset($tokens[$i + 1]) && $this->useStatementParser->isTokenIsPartOfUse($tokens[$i + 1])) {
99	6	$bufferUse .= $readableToken;
100	6	continue;
101		}
102	30	if (!empty($bufferUse)) {
103	6	if ($bufferUse !== $readableToken && strpos($readableToken, $bufferUse) === false) {
104	2	$readableToken = $bufferUse . $readableToken;
105		}
106	6	$bufferUse = '';
107		}
108		}
109
110	44	if (is_string($token)) {
111	44	if ($this->isOpenParenthesis($token)) {
112	44	$pendingParenthesisCount++;
113	44	} elseif ($this->isCloseParenthesis($token)) {
114	44	if ($pendingParenthesisCount === 0) {
115	12	break;
116		}
117	44	$pendingParenthesisCount--;
118	37	} elseif ($token === ',' \|\| $token === ';') {
119	34	if ($pendingParenthesisCount === 0) {
120	32	break;
121		}
122		}
123		}
124
125	44	$closureTokens[] = $readableToken;
126		}
127
128	44	return $this->formatClosure(implode('', $closureTokens), $level);
129		}
130
131	44	private function formatClosure(string $code, int $level): string
132		{
133	44	if ($level <= 0) {
134	37	return $code;
135		}
136	7	$spaces = str_repeat(' ', ($level -1) * 4);
137	7	$lines = explode("\n", $code);
138
139	7	foreach ($lines as $index => $line) {
140	7	if ($index === 0) {
141	7	continue;
142		}
143	1	$lines[$index] = $spaces . $line;
144		}
145
146	7	return rtrim(implode('', $lines), "\n");
147		}
148
149		/**
150		* Returns the last part from the use statement data.
151		*
152		* @param string $use The full use statement data.
153		*
154		* @return string The last part from the use statement data.
155		*/
156		private function getUseLastPart(string $use): string
157		{
158		$parts = array_filter(explode('\\', $use));
159		return (string) array_pop($parts);
160		}
161
162		/**
163		* Processes and returns the full use statement data.
164		*
165		* @param string $use The use statement data to process.
166		* @param array<string, string> $uses The use statement data.
167		*
168		* @return string The processed full use statement.
169		*/
170		private function processFullUse(string $use, array $uses): string
171		{
172		$lastPart = $this->getUseLastPart($use);
173
174		if (isset($uses[$lastPart])) {
175		return $uses[$lastPart];
176		}
177
178		$result = '';
179
180		do {
181		$lastPart = $this->getUseLastPart($use);
182		$use = mb_substr($use, 0, -mb_strlen("\\{$lastPart}"));
183		$result = ($uses[$lastPart] ?? $lastPart) . '\\' . $result;
184		} while (!empty($lastPart) && !isset($uses[$lastPart]));
185
186		return '\\' . trim($result, '\\');
187		}
188
189		/**
190		* Checks whether the use statement data consists of multiple parts.
191		*
192		* @param string $use The use statement data.
193		*
194		* @return bool Whether the use statement data consists of multiple parts.
195		*/
196	30	private function isUseConsistingOfMultipleParts(string $use): bool
197		{
198	30	return $use !== '\\' && strpos($use, '\\') !== false;
199		}
200
201		/**
202		* Checks whether the value of the token is an opening parenthesis.
203		*
204		* @param string $value The token value.
205		*
206		* @return bool Whether the value of the token is an opening parenthesis.
207		*/
208	44	private function isOpenParenthesis(string $value): bool
209		{
210	44	return in_array($value, ['{', '[', '(']);
211		}
212
213		/**
214		* Checks whether the value of the token is a closing parenthesis.
215		*
216		* @param string $value The token value.
217		*
218		* @return bool Whether the value of the token is a closing parenthesis.
219		*/
220	44	private function isCloseParenthesis(string $value): bool
221		{
222	44	return in_array($value, ['}', ']', ')']);
223		}
224		}
225

yiisoft / var-dumper

Pull Request — master (#54)

ClosureExporter::export() F

Complexity

Size

Duplication

Code Coverage

Importance

How to fix Long Method Complexity

Long Method

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