gettext_reader::select_string() - Code Metrics - codysnider/tt-rss - Measure and Improve Code Quality continuously with Scrutinizer

gettext_reader::select_string() A
last analyzed 2019-12-23 07:25 UTC

↳ Parent: gettext_reader
Complexity

Conditions	3
Paths	3
Size

Total Lines	18
Code Lines	13
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	3
eloc	13
c	0
b	0
f	0
nc	3
nop	1
dl	0
loc	18
rs	9.8333
<?php
/*
   Copyright (c) 2003, 2009 Danilo Segan <[email protected]>.
   Copyright (c) 2005 Nico Kaiser <[email protected]>

   This file is part of PHP-gettext.

   PHP-gettext 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.

   PHP-gettext 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 PHP-gettext; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

/**
 * 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.
 * The files are passed to gettext_reader as a Stream (see streams.php)
 *
 * This version has the ability to cache all strings and translations to
 * speed up the string lookup.
 * While the cache is enabled by default, it can be switched off with the
 * second parameter in the constructor (e.g. whenusing very large MO files
 * that you don't want to keep in memory)
 */
class gettext_reader {
    //public:
    var $error = 0; // public variable that holds error code (0 if no error)

    //private:
    var $BYTEORDER = 0; // 0: low endian, 1: big endian
    var $STREAM = null;
    var $short_circuit = false;
    var $enable_cache = false;
    var $originals = null; // offset of original table
    var $translations = null; // offset of translation table
    var $pluralheader = null; // cache header field for plural forms
    var $total = 0; // total string count
    var $table_originals = null; // table for original strings (offsets)
    var $table_translations = null; // table for translated strings (offsets)
    var $cache_translations = null; // original -> translation mapping


    /* Methods */


    /**
     * Reads a 32bit Integer from the Stream
     *
     * @access private
     * @return Integer from the Stream
     */
    function readint() {

        if ($this->BYTEORDER == 0) {
        // low endian
        $input = unpack('V', $this->STREAM->read(4));
        return array_shift($input);
        return array_shift(/** @scrutinizer ignore-type */ $input);
        } else {
        // big endian
        $input = unpack('N', $this->STREAM->read(4));
        return array_shift($input);
        }
    }

    function read($bytes) {

    return $this->STREAM->read($bytes);
    }

    /**
     * Reads an array of Integers from the Stream
     *
     * @param int count How many elements should be read
     * @return Array of Integers
     */
    function readintarray($count) {

    if ($this->BYTEORDER == 0) {
        // low endian
        return unpack('V'.$count, $this->STREAM->read(4 * $count));
        } else {
        // big endian
        return unpack('N'.$count, $this->STREAM->read(4 * $count));
        }
    }

    /**
     * Constructor
     *
     * @param object Reader the StreamReader object
filter:
    dependency_paths: ["lib/*"]
     * @param boolean enable_cache Enable or disable caching of strings (default on)
filter:
    dependency_paths: ["lib/*"]
     */
    function __construct($Reader, $enable_cache = true) {

    // If there isn't a StreamReader, turn on short circuit mode.
    if (!$Reader || isset($Reader->error)) {
        $this->short_circuit = true;
        return;
    }

    // Caching can be turned off
    $this->enable_cache = $enable_cache;

    $MAGIC1 = "\x95\x04\x12\xde";
    $MAGIC2 = "\xde\x12\x04\x95";

    $this->STREAM = $Reader;
    $magic = $this->read(4);
    if ($magic == $MAGIC1) {
        $this->BYTEORDER = 1;
    } elseif ($magic == $MAGIC2) {
        $this->BYTEORDER = 0;
    } else {
        $this->error = 1; // not MO file
        return false;
    }

    // FIXME: Do we care about revision? We should.
    $revision = $this->readint();


    $this->total = $this->readint();
    $this->originals = $this->readint();
    $this->translations = $this->readint();
    }

    /**
     * Loads the translation tables from the MO file into the cache
     * If caching is enabled, also loads all strings into a cache
     * to speed up translation lookups
     *
     * @access private
     */
    function load_tables() {

    if (is_array($this->cache_translations) &&
      is_array($this->table_originals) &&
      is_array($this->table_translations)) {
            return;
    }

    /* get original and translations tables */
    if (!is_array($this->table_originals)) {
        $this->STREAM->seekto($this->originals);
        $this->table_originals = $this->readintarray($this->total * 2);
    }
    if (!is_array($this->table_translations)) {
        $this->STREAM->seekto($this->translations);
        $this->table_translations = $this->readintarray($this->total * 2);
    }

    if ($this->enable_cache) {
        $this->cache_translations = array();
        /* read all strings in the cache */
        for ($i = 0; $i < $this->total; $i++) {
        $this->STREAM->seekto($this->table_originals[$i * 2 + 2]);
        $original = $this->STREAM->read($this->table_originals[$i * 2 + 1]);
        $this->STREAM->seekto($this->table_translations[$i * 2 + 2]);
        $translation = $this->STREAM->read($this->table_translations[$i * 2 + 1]);
        $this->cache_translations[$original] = $translation;
        }
    }
    }

    /**
     * Returns a string from the "originals" table
     *
     * @access private
     * @param int num Offset number of original string
     * @return string Requested string if found, otherwise ''
     */
    function get_original_string($num) {

    $length = $this->table_originals[$num * 2 + 1];
    $offset = $this->table_originals[$num * 2 + 2];
    if (!$length) {
            return '';
    }
    $this->STREAM->seekto($offset);
    $data = $this->STREAM->read($length);
    return (string) $data;
    }

    /**
     * Returns a string from the "translations" table
     *
     * @access private
     * @param int num Offset number of original string
     * @return string Requested string if found, otherwise ''
     */
    function get_translation_string($num) {

    $length = $this->table_translations[$num * 2 + 1];
    $offset = $this->table_translations[$num * 2 + 2];
    if (!$length) {
            return '';
    }
    $this->STREAM->seekto($offset);
    $data = $this->STREAM->read($length);
    return (string) $data;
    }

    /**
     * Binary search for string
     *
     * @access private
     * @param string string
     * @param int start (internally used in recursive function)
     * @param int end (internally used in recursive function)
     * @return int string number (offset in originals table)
     */
    function find_string($string, $start = -1, $end = -1) {

    if (($start == -1) or ($end == -1)) {
        // find_string is called with only one parameter, set start end end
        $start = 0;
        $end = $this->total;
    }
    if (abs($start - $end) <= 1) {
        // We're done, now we either found the string, or it doesn't exist
        $txt = $this->get_original_string($start);
        if ($string == $txt) {
                return $start;
        } else {
                return -1;
        }
    } else if ($start > $end) {
        // start > end -> turn around and start over
        return $this->find_string($string, $end, $start);
    } else {
        // Divide table in two parts
        $half = (int) (($start + $end) / 2);
        $cmp = strcmp($string, $this->get_original_string($half));
        if ($cmp == 0) {
                // string is exactly in the middle => return it
        return $half;
        } else if ($cmp < 0) {
                // The string is in the upper half
        return $this->find_string($string, $start, $half);
        } else {
                // The string is in the lower half
        return $this->find_string($string, $half, $end);
        }
    }
    }

    /**
     * Translates a string
     *
     * @access public
     * @param string string to be translated
     * @return string translated string (or original, if not found)
     */
    function translate($string) {

    if ($this->short_circuit) {
            return $string;
    }
    $this->load_tables();

    if ($this->enable_cache) {
        // Caching enabled, get translated string from cache
        if (array_key_exists($string, $this->cache_translations)) {
                return $this->cache_translations[$string];
        } else {
                return $string;
        }
    } else {
        // Caching not enabled, try to find string
        $num = $this->find_string($string);
        if ($num == -1) {
                return $string;
        } else {
                return $this->get_translation_string($num);
        }
    }
    }

    /**
     * Sanitize plural form expression for use in PHP eval call.
     *
     * @access private
     * @return string sanitized plural form expression
     */
    function sanitize_plural_expression($expr) {

    // Get rid of disallowed characters.
    $expr = preg_replace('@[^a-zA-Z0-9_:;\(\)\?\|\&=!<>+*/\%-]@', '', $expr);

    // Add parenthesis for tertiary '?' operator.
    $expr .= ';';
    $res = '';
    $p = 0;
    for ($i = 0; $i < strlen($expr); $i++) {
        $ch = $expr[$i];
        switch ($ch) {
        case '?':
        $res .= ' ? (';
        $p++;
        break;
        case ':':
        $res .= ') : (';
        break;
        case ';':
        $res .= str_repeat(')', $p).';';
        $p = 0;
        break;
        default:
        $res .= $ch;
        }
    }
    return $res;
    }

    /**
     * Parse full PO header and extract only plural forms line.
     *
     * @access private
     * @return string verbatim plural form header field
     */
    function extract_plural_forms_header_from_po_header($header) {

    if (preg_match("/(^|\n)plural-forms: ([^\n]*)\n/i", $header, $regs)) {
            $expr = $regs[2];
    } else {
            $expr = "nplurals=2; plural=n == 1 ? 0 : 1;";
    }
    return $expr;
    }

    /**
     * Get possible plural forms from MO header
     *
     * @access private
     * @return string plural form header
     */
    function get_plural_forms() {

    // lets assume message number 0 is header
    // this is true, right?
    $this->load_tables();

    // cache header field for plural forms
    if (!is_string($this->pluralheader)) {
        if ($this->enable_cache) {
        $header = $this->cache_translations[""];
        } else {
        $header = $this->get_translation_string(0);
        }
        $expr = $this->extract_plural_forms_header_from_po_header($header);
        $this->pluralheader = $this->sanitize_plural_expression($expr);
    }
    return $this->pluralheader;
    }

    /**
     * Detects which plural form to take
     *
     * @access private
     * @param n count
     * @return int array index of the right plural form
     */
    function select_string($n) {

    if (!is_int($n)) {

        throw new InvalidArgumentException(
        "Select_string only accepts integers: ".$n);
    }
    $string = $this->get_plural_forms();
    $string = str_replace('nplurals', "\$total", $string);
    $string = str_replace("n", $n, $string);
    $string = str_replace('plural', "\$plural", $string);

    $total = 0;
    $plural = 0;

    eval("$string");

    if ($plural >= $total) {
        $plural = $total - 1;
    }
    return $plural;
    }

    /**
     * Plural version of gettext
     *
     * @access public
     * @param string single
     * @param string plural
     * @param string number
     * @return translated plural form
filter:
    dependency_paths: ["lib/*"]
     */
    function ngettext($single, $plural, $number) {

    if ($this->short_circuit) {
        if ($number != 1) {
                return $plural;
        } else {
                return $single;
        }
    }

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

    // this should contains all strings separated by NULLs
    $key = $single.chr(0).$plural;


    if ($this->enable_cache) {
        if (!array_key_exists($key, $this->cache_translations)) {
        return ($number != 1) ? $plural : $single;
        } else {
        $result = $this->cache_translations[$key];
        $list = explode(chr(0), $result);
        return $list[$select];
        }
    } else {
        $num = $this->find_string($key);
        if ($num == -1) {
        return ($number != 1) ? $plural : $single;
        } else {
        $result = $this->get_translation_string($num);
        $list = explode(chr(0), $result);
        return $list[$select];
        }
    }
    }

    function pgettext($context, $msgid) {

    $key = $context.chr(4).$msgid;
    $ret = $this->translate($key);
    if (strpos($ret, "\004") !== false) {
        return $msgid;
    } else {
        return $ret;
    }
    }

    function npgettext($context, $singular, $plural, $number) {

    $key = $context.chr(4).$singular;
    $ret = $this->ngettext($key, $plural, $number);
    if (strpos($ret, "\004") !== false) {
        return $singular;
    } else {
        return $ret;
    }

    }
}

?>


codysnider / tt-rss

gettext_reader::select_string() A last analyzed 2019-12-23 07:25 UTC

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gettext_reader::select_string() A
last analyzed 2019-12-23 07:25 UTC
