208 lines
6.3 KiB
PHP
208 lines
6.3 KiB
PHP
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<?php
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/**
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* Class: Translation
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* A shim for translation support in the absence of GNU gettext.
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*/
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class Translation {
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const MO_MAGIC_WORD_BE = "950412de";
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const MO_MAGIC_WORD_LE = "de120495";
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const MO_SIZEOF_HEADER = 28;
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# Array: $mo
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# The loaded translations for each domain.
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private $mo = array();
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# String: $locale
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# The current locale.
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private $locale = "en_US";
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/**
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* Function: __construct
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* Discovers the current locale.
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*/
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private function __construct() {
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$this->locale = get_locale();
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}
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/**
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* Function: load
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* Loads translations from the .mo file into the supplied domain.
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*
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* Parameters:
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* $domain - The name of this translation domain.
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* $path - The path to the locale directory.
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* $reload - Reload the translation if already loaded?
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*/
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public function load($domain, $path, $reload = false): bool {
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$filepath = $path.DIR.$this->locale.DIR."LC_MESSAGES".DIR.$domain.".mo";
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if (isset($this->mo[$domain]) and !$reload)
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return true;
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if (!is_file($filepath) or !is_readable($filepath))
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return false;
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$mo_file = file_get_contents($filepath);
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$mo_data = array();
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$mo_length = strlen($mo_file);
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$big_endian = null;
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if (self::MO_SIZEOF_HEADER > $mo_length)
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return false;
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$id = unpack("H8magic", $mo_file);
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if ($id["magic"] == self::MO_MAGIC_WORD_BE)
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$big_endian = true;
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if ($id["magic"] == self::MO_MAGIC_WORD_LE)
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$big_endian = false;
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# Neither magic word matches; not a valid .mo file.
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if (!isset($big_endian))
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return false;
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$unpack = ($big_endian) ?
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"Nformat/Nnum/Nor/Ntr" :
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"Vformat/Vnum/Vor/Vtr" ;
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$mo_offset = unpack($unpack, $mo_file, 4);
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$unpack = ($big_endian) ?
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"Nlength/Noffset" :
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"Vlength/Voffset" ;
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for ($i = 0; $i < $mo_offset["num"]; $i++) {
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$or_str_offset = $mo_offset["or"] + ($i * 8);
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$tr_str_offset = $mo_offset["tr"] + ($i * 8);
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if (($or_str_offset + 8) > $mo_length)
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return false;
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if (($tr_str_offset + 8) > $mo_length)
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return false;
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$or_str_meta = unpack($unpack, $mo_file, $or_str_offset);
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$tr_str_meta = unpack($unpack, $mo_file, $tr_str_offset);
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$or_str_end = $or_str_meta["offset"] + $or_str_meta["length"];
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$tr_str_end = $tr_str_meta["offset"] + $tr_str_meta["length"];
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if ($or_str_end > $mo_length)
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return false;
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if ($tr_str_end > $mo_length)
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return false;
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$or_str_data = substr(
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$mo_file,
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$or_str_meta["offset"],
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$or_str_meta["length"]
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);
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$tr_str_data = substr(
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$mo_file,
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$tr_str_meta["offset"],
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$tr_str_meta["length"]
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);
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# Discover null-separated plural forms.
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$or_str_data = explode("\0", $or_str_data);
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$tr_str_data = explode("\0", $tr_str_data);
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# Add discovered messages to the data.
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$mo_data[] = array(
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"or" => $or_str_data,
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"tr" => $tr_str_data
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);
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}
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$this->mo[$domain] = $mo_data;
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return true;
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}
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/**
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* Function: text
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* Returns the singular or plural translation of a string.
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*
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* Parameters:
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* $domain - The translation domain to search.
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* $single - Singular string.
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* $plural - Pluralized string (optional).
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* $number - The number to judge by (optional).
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*/
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public function text($domain, $single, $plural = null, $number = 1): string {
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if (isset($plural)) {
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$array = $this->find($domain, $plural);
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$n = (int) $number;
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$nplural = $this->nplural($n);
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return fallback(
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$array[$nplural],
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($n != 1) ? $plural : $single
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);
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}
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$array = $this->find($domain, $single);
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return fallback($array[0], $single);
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}
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/**
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* Function: find
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* Returns a translation array from the supplied domain.
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*/
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public function find($domain, $string): array {
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if (!isset($this->mo[$domain]))
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return array();
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foreach ($this->mo[$domain] as $entry) {
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if (in_array($string, $entry["or"], true))
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return $entry["tr"];
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}
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return array();
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}
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/**
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* Function: nplural
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* Support for for languages with n != 2 plural forms.
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*/
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private function nplural($n): int {
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static $base;
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if (!isset($base))
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$base = strtolower(lang_base($this->locale));
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switch ($base) {
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case "zh":
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return 0;
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case "ar":
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if ($n == 0)
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return 0;
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elseif ($n == 1)
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return 1;
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elseif ($n == 2)
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return 2;
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elseif ($n % 100 >= 3 and $n % 100 <= 10)
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return 3;
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elseif ($n % 100 >= 11 and $n % 100 <= 99)
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return 4;
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else
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return 5;
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default:
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return ($n != 1) ? 1 : 0 ;
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}
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}
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/**
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* Function: current
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* Returns a singleton reference to the current class.
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*/
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public static function & current(): self {
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static $instance = null;
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$instance = (empty($instance)) ? new self() : $instance ;
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return $instance;
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}
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}
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