Translator::getPluralForms() - Code Metrics - Inspection of "Add ability to use APCu for translation cache" - phpmyadmin/motranslator - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#42)

unknown

created 2022-03-01 13:39 UTC

Translator::getPluralForms() A

↳ Parent: Translator

Complexity

Conditions	2
Paths	2

Size

Total Lines	15
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
eloc	6
c	0
b	0
f	0
nc	2
nop	0
dl	0
loc	15
rs	10
ccs	6
cts	6
cp	1
crap	2

<?php

declare(strict_types=1);

/*
    Copyright (c) 2003, 2009 Danilo Segan <[email protected]>.
    Copyright (c) 2005 Nico Kaiser <[email protected]>
    Copyright (c) 2016 Michal Čihař <[email protected]>

    This file is part of MoTranslator.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

namespace PhpMyAdmin\MoTranslator;

use PhpMyAdmin\MoTranslator\Cache\CacheInterface;
use PhpMyAdmin\MoTranslator\Cache\GetAllInterface;
use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Throwable;

use function chr;
use function count;
use function explode;
use function get_class;
use function implode;
use function intval;
use function ltrim;
use function preg_replace;
use function rtrim;
use function sprintf;
use function stripos;
use function strpos;
use function strtolower;
use function substr;
use function trim;

/**
 * Provides a simple gettext replacement that works independently from
 * the system's gettext abilities.
 * It can read MO files and use them for translating strings.
 *
 * It caches ll strings and translations to speed up the string lookup.
 */
class Translator
{
    /**
     * None error.
     */
    public const ERROR_NONE = 0;
    /**
     * File does not exist.
     */
    public const ERROR_DOES_NOT_EXIST = 1;
    /**
     * File has bad magic number.
     */
    public const ERROR_BAD_MAGIC = 2;
    /**
     * Error while reading file, probably too short.
     */
    public const ERROR_READING = 3;

    /**
     * Big endian mo file magic bytes.
     */
    public const MAGIC_BE = "\x95\x04\x12\xde";
    /**
     * Little endian mo file magic bytes.
     */
    public const MAGIC_LE = "\xde\x12\x04\x95";

    /**
     * Parse error code (0 if no error).
     *
     * @var int
     */
    public $error = self::ERROR_NONE;

    /**
     * Cache header field for plural forms.
     *
     * @var string|null
     */
    private $pluralEquation = null;

    /** @var ExpressionLanguage|null Evaluator for plurals */
    private $pluralExpression = null;

    /** @var int|null number of plurals */
    private $pluralCount = null;

    /** @var CacheInterface */
    private $cache;

    public function __construct(CacheInterface $cache)
    {
        $this->cache = $cache;
    }

    /**
     * Translates a string.
     *
     * @param string $msgid String to be translated
     *
     * @return string translated string (or original, if not found)
     */
    public function gettext(string $msgid): string
    {
        return $this->cache->get($msgid);
    }

    /**
     * Check if a string is translated.
     *
     * @param string $msgid String to be checked
     */
    public function exists(string $msgid): bool
    {
        return $this->cache->has($msgid);
    }

    /**
     * Sanitize plural form expression for use in ExpressionLanguage.
     *
     * @param string $expr Expression to sanitize
     *
     * @return string sanitized plural form expression
     */
    public static function sanitizePluralExpression(string $expr): string
    {
        // Parse equation
        $expr = explode(';', $expr);
        if (count($expr) >= 2) {
            $expr = $expr[1];
        } else {
            $expr = $expr[0];
        }

        $expr = trim(strtolower($expr));
        // Strip plural prefix
        if (substr($expr, 0, 6) === 'plural') {
            $expr = ltrim(substr($expr, 6));
        }

        // Strip equals
        if (substr($expr, 0, 1) === '=') {
            $expr = ltrim(substr($expr, 1));
        }

        // Cleanup from unwanted chars
        $expr = preg_replace('@[^n0-9:\(\)\?=!<>/%&| ]@', '', $expr);

        return (string) $expr;
    }

    /**
     * Extracts number of plurals from plurals form expression.
     *
     * @param string $expr Expression to process
     *
     * @return int Total number of plurals
     */
    public static function extractPluralCount(string $expr): int
    {
        $parts = explode(';', $expr, 2);
        $nplurals = explode('=', trim($parts[0]), 2);
        if (strtolower(rtrim($nplurals[0])) !== 'nplurals') {
            return 1;
        }

        if (count($nplurals) === 1) {
            return 1;
        }

        return intval($nplurals[1]);
    }

    /**
     * Parse full PO header and extract only plural forms line.
     *
     * @param string $header Gettext header
     *
     * @return string verbatim plural form header field
     */
    public static function extractPluralsForms(string $header): string
    {
        $headers = explode("\n", $header);
        $expr = 'nplurals=2; plural=n == 1 ? 0 : 1;';
        foreach ($headers as $header) {
            if (stripos($header, 'Plural-Forms:') !== 0) {
                continue;
            }

            $expr = substr($header, 13);
        }

        return $expr;
    }

    /**
     * Get possible plural forms from MO header.
     *
     * @return string plural form header
     */
    private function getPluralForms(): string
    {
        // lets assume message number 0 is header
        // this is true, right?

        // cache header field for plural forms
        if ($this->pluralEquation === null) {
            $header = $this->cache->get('');

            $expr = $this->extractPluralsForms($header);
            $this->pluralEquation = $this->sanitizePluralExpression($expr);
            $this->pluralCount = $this->extractPluralCount($expr);
        }

        return $this->pluralEquation;
    }

    /**
     * Detects which plural form to take.
     *
     * @param int $n count of objects
     *
     * @return int array index of the right plural form
     */
    private function selectString(int $n): int
    {
        if ($this->pluralExpression === null) {
            $this->pluralExpression = new ExpressionLanguage();
        }

        try {
            $plural = (int) $this->pluralExpression->evaluate(
                $this->getPluralForms(),
                ['n' => $n]
            );
        } catch (Throwable $e) {
            $plural = 0;
        }

        if ($plural >= $this->pluralCount) {
            $plural = $this->pluralCount - 1;
        }

        return $plural;
    }

    /**
     * Plural version of gettext.
     *
     * @param string $msgid       Single form
     * @param string $msgidPlural Plural form
     * @param int    $number      Number of objects
     *
     * @return string translated plural form
     */
    public function ngettext(string $msgid, string $msgidPlural, int $number): string
    {
        // this should contains all strings separated by NULLs
        $key = implode(chr(0), [$msgid, $msgidPlural]);
        if (! $this->cache->has($key)) {
            return $number !== 1 ? $msgidPlural : $msgid;
        }

        $result = $this->cache->get($key);

        // find out the appropriate form
        $select = $this->selectString($number);

        $list = explode(chr(0), $result);
        // @codeCoverageIgnoreStart
        if ($list === false) {
            // This was added in 3ff2c63bcf85f81b3a205ce7222de11b33e2bf56 for phpstan
            // But according to the php manual it should never happen
            return '';
        }

        // @codeCoverageIgnoreEnd

        if (! isset($list[$select])) {
            return $list[0];
        }

        return $list[$select];
    }

    /**
     * Translate with context.
     *
     * @param string $msgctxt Context
     * @param string $msgid   String to be translated
     *
     * @return string translated plural form
     */
    public function pgettext(string $msgctxt, string $msgid): string
    {
        $key = implode(chr(4), [$msgctxt, $msgid]);
        $ret = $this->gettext($key);
        if (strpos($ret, chr(4)) !== false) {
            return $msgid;
        }

        return $ret;
    }

    /**
     * Plural version of pgettext.
     *
     * @param string $msgctxt     Context
     * @param string $msgid       Single form
     * @param string $msgidPlural Plural form
     * @param int    $number      Number of objects
     *
     * @return string translated plural form
     */
    public function npgettext(string $msgctxt, string $msgid, string $msgidPlural, int $number): string
    {
        $key = implode(chr(4), [$msgctxt, $msgid]);
        $ret = $this->ngettext($key, $msgidPlural, $number);
        if (strpos($ret, chr(4)) !== false) {
            return $msgid;
        }

        return $ret;
    }

    /**
     * Set translation in place
     *
     * @param string $msgid  String to be set
     * @param string $msgstr Translation
     */
    public function setTranslation(string $msgid, string $msgstr): void
    {
        $this->cache->set($msgid, $msgstr);
    }

    /**
     * Set the translations
     *
     * @param array<string,string> $translations The translations "key => value" array
     */
    public function setTranslations(array $translations): void
    {
        $this->cache->setAll($translations);
    }

    /**
     * Get the translations
     *
     * @return array<string,string> The translations "key => value" array
     */
    public function getTranslations(): array
    {
        if ($this->cache instanceof GetAllInterface) {
            return $this->cache->getAll();
        }

        throw new CacheException(sprintf(
            "Cache '%s' does not support getting translations",
            get_class($this->cache)
        ));
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		/*
6		Copyright (c) 2003, 2009 Danilo Segan <[email protected]>.
7		Copyright (c) 2005 Nico Kaiser <[email protected]>
8		Copyright (c) 2016 Michal Čihař <[email protected]>
9
10		This file is part of MoTranslator.
11
12		This program is free software; you can redistribute it and/or modify
13		it under the terms of the GNU General Public License as published by
14		the Free Software Foundation; either version 2 of the License, or
15		(at your option) any later version.
16
17		This program is distributed in the hope that it will be useful,
18		but WITHOUT ANY WARRANTY; without even the implied warranty of
19		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20		GNU General Public License for more details.
21
22		You should have received a copy of the GNU General Public License along
23		with this program; if not, write to the Free Software Foundation, Inc.,
24		51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25		*/
26
27		namespace PhpMyAdmin\MoTranslator;
28
29		use PhpMyAdmin\MoTranslator\Cache\CacheInterface;
30		use PhpMyAdmin\MoTranslator\Cache\GetAllInterface;
31		use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
32		use Throwable;
33
34		use function chr;
35		use function count;
36		use function explode;
37		use function get_class;
38		use function implode;
39		use function intval;
40		use function ltrim;
41		use function preg_replace;
42		use function rtrim;
43		use function sprintf;
44		use function stripos;
45		use function strpos;
46		use function strtolower;
47		use function substr;
48		use function trim;
49
50		/**
51		* Provides a simple gettext replacement that works independently from
52		* the system's gettext abilities.
53		* It can read MO files and use them for translating strings.
54		*
55		* It caches ll strings and translations to speed up the string lookup.
56		*/
57		class Translator
58		{
59		/**
60		* None error.
61		*/
62		public const ERROR_NONE = 0;
63		/**
64		* File does not exist.
65		*/
66		public const ERROR_DOES_NOT_EXIST = 1;
67		/**
68		* File has bad magic number.
69		*/
70		public const ERROR_BAD_MAGIC = 2;
71		/**
72		* Error while reading file, probably too short.
73		*/
74		public const ERROR_READING = 3;
75
76		/**
77		* Big endian mo file magic bytes.
78		*/
79		public const MAGIC_BE = "\x95\x04\x12\xde";
80		/**
81		* Little endian mo file magic bytes.
82		*/
83		public const MAGIC_LE = "\xde\x12\x04\x95";
84
85		/**
86		* Parse error code (0 if no error).
87		*
88		* @var int
89		*/
90		public $error = self::ERROR_NONE;
91
92		/**
93		* Cache header field for plural forms.
94		*
95		* @var string\|null
96		*/
97		private $pluralEquation = null;
98
99		/** @var ExpressionLanguage\|null Evaluator for plurals */
100		private $pluralExpression = null;
101
102		/** @var int\|null number of plurals */
103		private $pluralCount = null;
104
105		/** @var CacheInterface */
106		private $cache;
107
108		public function __construct(CacheInterface $cache)
109		{
110		$this->cache = $cache;
111		}
112
113		/**
114	220	* Translates a string.
115		*
116		* @param string $msgid String to be translated
117	220	*
118	4	* @return string translated string (or original, if not found)
119		*/
120		public function gettext(string $msgid): string
121	220	{
122	55	return $this->cache->get($msgid);
123		}
124
125		/**
126		* Check if a string is translated.
127		*
128		* @param string $msgid String to be checked
129	220	*/
130		public function exists(string $msgid): bool
131	220	{
132	64	return $this->cache->has($msgid);
133		}
134	64
135		/**
136		* Sanitize plural form expression for use in ExpressionLanguage.
137	156	*
138		* @param string $expr Expression to sanitize
139		*
140	156	* @return string sanitized plural form expression
141	152	*/
142	120	public static function sanitizePluralExpression(string $expr): string
143	32	{
144	28	// Parse equation
145		$expr = explode(';', $expr);
146	4	if (count($expr) >= 2) {
147		$expr = $expr[1];
148	4	} else {
149		$expr = $expr[0];
150		}
151
152	148	$expr = trim(strtolower($expr));
153	148	// Strip plural prefix
154	136	if (substr($expr, 0, 6) === 'plural') {
155		$expr = ltrim(substr($expr, 6));
156		}
157	136
158	136	// Strip equals
159	132	if (substr($expr, 0, 1) === '=') {
160		$expr = ltrim(substr($expr, 1));
161		}
162	132
163	132	// Cleanup from unwanted chars
164	132	$expr = preg_replace('@[^n0-9:\(\)\?=!<>/%&\| ]@', '', $expr);
165	132
166	132	return (string) $expr;
167	132	}
168	132
169		/**
170	20	* Extracts number of plurals from plurals form expression.
171	20	*
172		* @param string $expr Expression to process
173	20	*
174		* @return int Total number of plurals
175	33	*/
176		public static function extractPluralCount(string $expr): int
177		{
178		$parts = explode(';', $expr, 2);
179		$nplurals = explode('=', trim($parts[0]), 2);
180		if (strtolower(rtrim($nplurals[0])) !== 'nplurals') {
181		return 1;
182		}
183
184	124	if (count($nplurals) === 1) {
185		return 1;
186	124	}
187	88
188		return intval($nplurals[1]);
189		}
190	60
191		/**
192		* Parse full PO header and extract only plural forms line.
193		*
194		* @param string $header Gettext header
195		*
196		* @return string verbatim plural form header field
197		*/
198	24	public static function extractPluralsForms(string $header): string
199		{
200	24	$headers = explode("\n", $header);
201		$expr = 'nplurals=2; plural=n == 1 ? 0 : 1;';
202		foreach ($headers as $header) {
203		if (stripos($header, 'Plural-Forms:') !== 0) {
204		continue;
205		}
206
207		$expr = substr($header, 13);
208		}
209
210	92	return $expr;
211		}
212
213	92	/**
214	92	* Get possible plural forms from MO header.
215	80	*
216		* @return string plural form header
217	12	*/
218		private function getPluralForms(): string
219		{
220	92	// lets assume message number 0 is header
221		// this is true, right?
222	92
223	84	// cache header field for plural forms
224		if ($this->pluralEquation === null) {
225		$header = $this->cache->get('');
226
227	92	$expr = $this->extractPluralsForms($header);
228	84	$this->pluralEquation = $this->sanitizePluralExpression($expr);
229		$this->pluralCount = $this->extractPluralCount($expr);
230		}
231
232	92	return $this->pluralEquation;
233		}
234	92
235		/**
236		* Detects which plural form to take.
237		*
238		* @param int $n count of objects
239		*
240		* @return int array index of the right plural form
241		*/
242		private function selectString(int $n): int
243		{
244	88	if ($this->pluralExpression === null) {
245		$this->pluralExpression = new ExpressionLanguage();
246	88	}
247	88
248	88	try {
249	8	$plural = (int) $this->pluralExpression->evaluate(
250		$this->getPluralForms(),
251		['n' => $n]
252	80	);
253	4	} catch (Throwable $e) {
254		$plural = 0;
255		}
256	76
257		if ($plural >= $this->pluralCount) {
258		$plural = $this->pluralCount - 1;
259		}
260
261		return $plural;
262		}
263
264		/**
265		* Plural version of gettext.
266	80	*
267		* @param string $msgid Single form
268	80	* @param string $msgidPlural Plural form
269	80	* @param int $number Number of objects
270	80	*
271	80	* @return string translated plural form
272	80	*/
273		public function ngettext(string $msgid, string $msgidPlural, int $number): string
274		{
275	60	// this should contains all strings separated by NULLs
276		$key = implode(chr(0), [$msgid, $msgidPlural]);
277		if (! $this->cache->has($key)) {
278	80	return $number !== 1 ? $msgidPlural : $msgid;
279		}
280
281		$result = $this->cache->get($key);
282
283		// find out the appropriate form
284		$select = $this->selectString($number);
285
286	68	$list = explode(chr(0), $result);
287		// @codeCoverageIgnoreStart
288		if ($list === false) {
289		// This was added in 3ff2c63bcf85f81b3a205ce7222de11b33e2bf56 for phpstan
290		// But according to the php manual it should never happen
291		return '';
292	68	}
293	64
294	52	// @codeCoverageIgnoreEnd
295
296	12	if (! isset($list[$select])) {
297		return $list[0];
298		}
299	64
300	64	return $list[$select];
301	64	}
302
303		/**
304	68	* Translate with context.
305		*
306		* @param string $msgctxt Context
307		* @param string $msgid String to be translated
308		*
309		* @return string translated plural form
310		*/
311		public function pgettext(string $msgctxt, string $msgid): string
312		{
313		$key = implode(chr(4), [$msgctxt, $msgid]);
314	68	$ret = $this->gettext($key);
315		if (strpos($ret, chr(4)) !== false) {
316	68	return $msgid;
317	64	}
318
319		return $ret;
320		}
321	68
322	68	/**
323	17	* Plural version of pgettext.
324		*
325	4	* @param string $msgctxt Context
326	4	* @param string $msgid Single form
327		* @param string $msgidPlural Plural form
328		* @param int $number Number of objects
329	68	*
330	4	* @return string translated plural form
331		*/
332		public function npgettext(string $msgctxt, string $msgid, string $msgidPlural, int $number): string
333	68	{
334		$key = implode(chr(4), [$msgctxt, $msgid]);
335		$ret = $this->ngettext($key, $msgidPlural, $number);
336		if (strpos($ret, chr(4)) !== false) {
337		return $msgid;
338		}
339
340		return $ret;
341		}
342
343		/**
344		* Set translation in place
345	108	*
346		* @param string $msgid String to be set
347		* @param string $msgstr Translation
348	108	*/
349	108	public function setTranslation(string $msgid, string $msgstr): void
350	72	{
351		$this->cache->set($msgid, $msgstr);
352		}
353
354	68	/**
355		* Set the translations
356	68	*
357	68	* @param array<string,string> $translations The translations "key => value" array
358		*/
359		public function setTranslations(array $translations): void
360		{
361		$this->cache->setAll($translations);
362		}
363
364		/**
365		* Get the translations
366		*
367	68	* @return array<string,string> The translations "key => value" array
368	4	*/
369		public function getTranslations(): array
370		{
371	68	if ($this->cache instanceof GetAllInterface) {
372		return $this->cache->getAll();
373		}
374
375		throw new CacheException(sprintf(
376		"Cache '%s' does not support getting translations",
377		get_class($this->cache)
378		));
379		}
380		}
381

phpmyadmin / motranslator

Pull Request — master (#42)

Translator::getPluralForms() A

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