Translator::extractPluralsForms() - Code Metrics - Inspection of "Try using older version for PHP 5.4 compatibility" - phpmyadmin/motranslator - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 01349c...a83e3f )

by Michal

created 2016-10-13 11:14 UTC

Translator::extractPluralsForms() A

↳ Parent: Translator

Complexity

Conditions	3
Paths	3

Size

Total Lines	11
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	9
CRAP Score	3

Importance

Changes

Metric	Value
cc	3
eloc	7
nc	3
nop	1
dl	0
loc	11
ccs	9
cts	9
cp	1
crap	3
rs	9.4285
c	0
b	0
f	0

<?php
/*
    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 MoTranslator;

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;

/**
 * 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
     */
    const ERROR_NONE = 0;
    /**
     * File does not exist
     */
    const ERROR_DOES_NOT_EXIST = 1;
    /**
     * File has bad magic number
     */
    const ERROR_BAD_MAGIC = 2;
    /**
     * Error while reading file, probably too short
     */
    const ERROR_READING = 3;

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

    /**
     * Parse error code (0 if no error)
     *
     * @var int
     */
    public $error = Translator::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;
    /**
     * Array with original -> translation mapping
     *
     * @var array
     */
    private $cache_translations = array();

    /**
     * Constructor
     *
     * @param string $filename Name of mo file to load
     */
    public function __construct($filename)
    {
        if (!is_readable($filename)) {
            $this->error = Translator::ERROR_DOES_NOT_EXIST;
            return;
        }

        $stream = new StringReader($filename);

        try {
            $magic = $stream->read(0, 4);
            if (strcmp($magic, Translator::MAGIC_LE) == 0) {
                $unpack = 'V';
            } elseif (strcmp($magic, Translator::MAGIC_BE) == 0) {
                $unpack = 'N';
            } else {
                $this->error = Translator::ERROR_BAD_MAGIC;
                return;
            }

            /* Parse header */
            $total = $stream->readint($unpack, 8);
            $originals = $stream->readint($unpack, 12);
            $translations = $stream->readint($unpack, 16);

            /* get original and translations tables */
            $table_originals = $stream->readintarray($unpack, $originals, $total * 2);
            $table_translations = $stream->readintarray($unpack, $translations, $total * 2);

            /* read all strings to the cache */
            for ($i = 0; $i < $total; $i++) {
                $original = $stream->read($table_originals[$i * 2 + 2], $table_originals[$i * 2 + 1]);
                $translation = $stream->read($table_translations[$i * 2 + 2], $table_translations[$i * 2 + 1]);
                $this->cache_translations[$original] = $translation;
            }
        } catch (ReaderException $e) {
            $this->error = Translator::ERROR_READING;
            return;
        }
    }

    /**
     * Translates a string
     *
     * @param string $msgid String to be translated
     *
     * @return string translated string (or original, if not found)
     */
    public function gettext($msgid)
    {
        if (array_key_exists($msgid, $this->cache_translations)) {
            return $this->cache_translations[$msgid];
        } else {
            return $msgid;
        }
    }

    /**
     * Sanitize plural form expression for use in ExpressionLanguage
     *
     * @param string $expr Expression to sanitize
     *
     * @return string sanitized plural form expression
     */
    public static function sanitizePluralExpression($expr)
    {
        // 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') {
            $expr = trim(substr($expr, 6));
        }
        // Strip equals
        if (substr($expr, 0, 1) === '=') {
            $expr = trim(substr($expr, 1));
        }
        return $expr;
    }

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

    /**
     * Parse full PO header and extract only plural forms line.
     *
     * @param string $header Gettext header
     *
     * @return string verbatim plural form header field
     */
    public static function extractPluralsForms($header)
    {
        $headers = explode("\n", $header);
        $expr = 'nplurals=2; plural=n == 1 ? 0 : 1;';
        foreach ($headers as $header) {
            if (stripos($header, 'Plural-Forms:') === 0) {
                $expr = substr($header, 13);
            }
        }
        return $expr;
    }

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

        // cache header field for plural forms
        if (is_null($this->pluralequation)) {
            $header = $this->cache_translations[''];
            $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 $n count of objects
     *
     * @return int array index of the right plural form
     */
    private function selectString($n)
    {
        if (is_null($this->pluralexpression)) {
            $this->pluralexpression = new ExpressionLanguage();
        }
        $plural = $this->pluralexpression->evaluate(
            $this->getPluralForms(), array('n' => $n)
        );

        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 string $number      Number of objects
     *
     * @return string translated plural form
     */
    public function ngettext($msgid, $msgidPlural, $number)
    {
        // this should contains all strings separated by NULLs
        $key = implode(chr(0), array($msgid, $msgidPlural));
        if (!array_key_exists($key, $this->cache_translations)) {
            return ($number != 1) ? $msgidPlural : $msgid;
        }

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

        $result = $this->cache_translations[$key];
        $list = explode(chr(0), $result);
        return $list[$select];
    }

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

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


1		<?php
2		/*
3		Copyright (c) 2003, 2009 Danilo Segan <[email protected]>.
4		Copyright (c) 2005 Nico Kaiser <[email protected]>
5		Copyright (c) 2016 Michal Čihař <[email protected]>
6
7		This file is part of MoTranslator.
8
9		This program is free software; you can redistribute it and/or modify
10		it under the terms of the GNU General Public License as published by
11		the Free Software Foundation; either version 2 of the License, or
12		(at your option) any later version.
13
14		This program is distributed in the hope that it will be useful,
15		but WITHOUT ANY WARRANTY; without even the implied warranty of
16		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17		GNU General Public License for more details.
18
19		You should have received a copy of the GNU General Public License along
20		with this program; if not, write to the Free Software Foundation, Inc.,
21		51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22		*/
23
24		namespace MoTranslator;
25
26		use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
27
28		/**
29		* Provides a simple gettext replacement that works independently from
30		* the system's gettext abilities.
31		* It can read MO files and use them for translating strings.
32		*
33		* It caches ll strings and translations to speed up the string lookup.
34		*/
35		class Translator {
36
37		/**
38		* None error
39		*/
40		const ERROR_NONE = 0;
41		/**
42		* File does not exist
43		*/
44		const ERROR_DOES_NOT_EXIST = 1;
45		/**
46		* File has bad magic number
47		*/
48		const ERROR_BAD_MAGIC = 2;
49		/**
50		* Error while reading file, probably too short
51		*/
52		const ERROR_READING = 3;
53
54		/**
55		* Big endian mo file magic bytes.
56		*/
57		const MAGIC_BE = "\x95\x04\x12\xde";
58		/**
59		* Little endian mo file magic bytes.
60		*/
61		const MAGIC_LE = "\xde\x12\x04\x95";
62
63		/**
64		* Parse error code (0 if no error)
65		*
66		* @var int
67		*/
68		public $error = Translator::ERROR_NONE;
69
70		/**
71		* Cache header field for plural forms
72		*
73		* @var string\|null
74		*/
75		private $pluralequation = NULL;
76		/**
77		*
78		*
79		* @var ExpressionLanguage\|null Evaluator for plurals
80		*/
81		private $pluralexpression = NULL;
82		/**
83		*
84		*
85		* @var int\|null number of plurals
86		*/
87		private $pluralcount = NULL;
88		/**
89		* Array with original -> translation mapping
90		*
91		* @var array
92		*/
93		private $cache_translations = array();
94
95		/**
96		* Constructor
97		*
98		* @param string $filename Name of mo file to load
99		*/
100	23	public function __construct($filename)
101		{
102	23	if (!is_readable($filename)) {
103	4	$this->error = Translator::ERROR_DOES_NOT_EXIST;
104	4	return;
105		}
106
107	19	$stream = new StringReader($filename);
108
109		try {
110	19	$magic = $stream->read(0, 4);
111	18	if (strcmp($magic, Translator::MAGIC_LE) == 0) {
112	11	$unpack = 'V';
113	18	} elseif (strcmp($magic, Translator::MAGIC_BE) == 0) {
114	6	$unpack = 'N';
115	6	} else {
116	1	$this->error = Translator::ERROR_BAD_MAGIC;
117	1	return;
118		}
119
120		/* Parse header */
121	17	$total = $stream->readint($unpack, 8);
122	14	$originals = $stream->readint($unpack, 12);
123	14	$translations = $stream->readint($unpack, 16);
124
125		/* get original and translations tables */
126	14	$table_originals = $stream->readintarray($unpack, $originals, $total * 2);
127	14	$table_translations = $stream->readintarray($unpack, $translations, $total * 2);
128
129		/* read all strings to the cache */
130	14	for ($i = 0; $i < $total; $i++) {
131	14	$original = $stream->read($table_originals[$i * 2 + 2], $table_originals[$i * 2 + 1]);
132	14	$translation = $stream->read($table_translations[$i * 2 + 2], $table_translations[$i * 2 + 1]);
133	14	$this->cache_translations[$original] = $translation;
134	14	}
135	18	} catch (ReaderException $e) {
136	4	$this->error = Translator::ERROR_READING;
137	4	return;
138		}
139	14	}
140
141		/**
142		* Translates a string
143		*
144		* @param string $msgid String to be translated
145		*
146		* @return string translated string (or original, if not found)
147		*/
148	20	public function gettext($msgid)
149		{
150	20	if (array_key_exists($msgid, $this->cache_translations)) {
151	13	return $this->cache_translations[$msgid];
152		} else {
153	10	return $msgid;
154		}
155		}
156
157		/**
158		* Sanitize plural form expression for use in ExpressionLanguage
159		*
160		* @param string $expr Expression to sanitize
161		*
162		* @return string sanitized plural form expression
163		*/
164	10	public static function sanitizePluralExpression($expr)
165		{
166		// Parse equation
167	10	$expr = explode(';', $expr);
168	10	if (count($expr) >= 2) {
169	8	$expr = $expr[1];
170	8	} else {
171	2	$expr = $expr[0];
172		}
173	10	$expr = trim(strtolower($expr));
174		// Strip plural prefix
175	10	if (substr($expr, 0, 6) === 'plural') {
176	9	$expr = trim(substr($expr, 6));
177	9	}
178		// Strip equals
179	10	if (substr($expr, 0, 1) === '=') {
180	9	$expr = trim(substr($expr, 1));
181	9	}
182	10	return $expr;
183		}
184
185		/**
186		* Extracts number of plurals from plurals form expression
187		*
188		* @param string $expr Expression to process
189		*
190		* @return int Total number of plurals
191		*/
192	9	public static function extractPluralCount($expr)
193		{
194	9	$parts = explode(';', $expr, 2);
195	9	$nplurals = explode('=', trim($parts[0]), 2);
196	9	if (strtolower(trim($nplurals[0])) != 'nplurals') {
197	2	return 1;
198		}
199	7	return intval($nplurals[1]);
200		}
201
202		/**
203		* Parse full PO header and extract only plural forms line.
204		*
205		* @param string $header Gettext header
206		*
207		* @return string verbatim plural form header field
208		*/
209	8	public static function extractPluralsForms($header)
210		{
211	8	$headers = explode("\n", $header);
212	8	$expr = 'nplurals=2; plural=n == 1 ? 0 : 1;';
213	8	foreach ($headers as $header) {
214	8	if (stripos($header, 'Plural-Forms:') === 0) {
215	6	$expr = substr($header, 13);
216	6	}
217	8	}
218	8	return $expr;
219		}
220
221		/**
222		* Get possible plural forms from MO header
223		*
224		* @return string plural form header
225		*/
226	5	private function getPluralForms()
227		{
228		// lets assume message number 0 is header
229		// this is true, right?
230
231		// cache header field for plural forms
232	5	if (is_null($this->pluralequation)) {
233	4	$header = $this->cache_translations[''];
234	4	$expr = $this->extractPluralsForms($header);
235	4	$this->pluralequation = $this->sanitizePluralExpression($expr);
236	4	$this->pluralcount = $this->extractPluralCount($expr);
237	4	}
238	5	return $this->pluralequation;
239		}
240
241		/**
242		* Detects which plural form to take
243		*
244		* @param int $n count of objects
245		*
246		* @return int array index of the right plural form
247		*/
248	5	private function selectString($n)
249		{
250	5	if (is_null($this->pluralexpression)) {
251	4	$this->pluralexpression = new ExpressionLanguage();
252	4	}
253	5	$plural = $this->pluralexpression->evaluate(
254	5	$this->getPluralForms(), array('n' => $n)
255	5	);
256
257	5	if ($plural >= $this->pluralcount) {
258	1	$plural = $this->pluralcount - 1;
259	1	}
260	5	return $plural;
261		}
262
263		/**
264		* Plural version of gettext
265		*
266		* @param string $msgid Single form
267		* @param string $msgidPlural Plural form
268		* @param string $number Number of objects
269		*
270		* @return string translated plural form
271		*/
272	12	public function ngettext($msgid, $msgidPlural, $number)
273		{
274		// this should contains all strings separated by NULLs
275	12	$key = implode(chr(0), array($msgid, $msgidPlural));
276	12	if (!array_key_exists($key, $this->cache_translations)) {
277	12	return ($number != 1) ? $msgidPlural : $msgid;
278		}
279
280		// find out the appropriate form
281	5	$select = $this->selectString($number);
282
283	5	$result = $this->cache_translations[$key];
284	5	$list = explode(chr(0), $result);
285	5	return $list[$select];
286		}
287
288		/**
289		* Translate with context
290		*
291		* @param string $msgctxt Context
292		* @param string $msgid String to be translated
293		*
294		* @return string translated plural form
295		*/
296	10	public function pgettext($msgctxt, $msgid)
297		{
298	10	$key = implode(chr(4), array($msgctxt, $msgid));
299	10	$ret = $this->gettext($key);
300	10	if (strpos($ret, chr(4)) !== false) {
301	5	return $msgid;
302		} else {
303	5	return $ret;
304		}
305		}
306
307		/**
308		* Plural version of pgettext
309		*
310		* @param string $msgctxt Context
311		* @param string $msgid Single form
312		* @param string $msgidPlural Plural form
313		* @param string $number Number of objects
314		*
315		* @return string translated plural form
316		*/
317	4	public function npgettext($msgctxt, $msgid, $msgidPlural, $number)
318		{
319	4	$key = implode(chr(4), array($msgctxt, $msgid));
320	4	$ret = $this->ngettext($key, $msgidPlural, $number);
321	4	if (strpos($ret, chr(4)) !== false) {
322	1	return $msgid;
323		} else {
324	3	return $ret;
325		}
326		}
327		}
328

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Translator::extractPluralsForms() A

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