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<?php
/**
* Class for a set of entries for translation and their associated headers
*
* @version $Id: translations.php 718 2012-10-31 00:32:02Z nbachiyski $
* @package pomo
* @subpackage translations
*/
require_once dirname(__FILE__) . '/entry.php';
if ( !class_exists( 'Translations' ) ):
class Translations {
var $entries = array();
var $headers = array();
/**
* Add entry to the PO structure
*
* @param array|Translation_Entry &$entry
* @return bool true on success, false if the entry doesn't have a key
*/
function add_entry($entry) {
if (is_array($entry)) {
$entry = new Translation_Entry($entry);
}
$key = $entry->key();
if (false === $key) return false;
$this->entries[$key] = &$entry;
return true;
}
/**
* @param array|Translation_Entry $entry
* @return bool
*/
function add_entry_or_merge($entry) {
if (is_array($entry)) {
$entry = new Translation_Entry($entry);
}
$key = $entry->key();
if (false === $key) return false;
if (isset($this->entries[$key]))
$this->entries[$key]->merge_with($entry);
else
$this->entries[$key] = &$entry;
return true;
}
/**
* Sets $header PO header to $value
*
* If the header already exists, it will be overwritten
*
* TODO: this should be out of this class, it is gettext specific
*
* @param string $header header name, without trailing :
* @param string $value header value, without trailing \n
*/
function set_header($header, $value) {
$this->headers[$header] = $value;
}
/**
* @param array $headers
*/
function set_headers($headers) {
foreach($headers as $header => $value) {
$this->set_header($header, $value);
}
}
/**
* @param string $header
*/
function get_header($header) {
return isset($this->headers[$header])? $this->headers[$header] : false;
}
/**
* @param Translation_Entry $entry
*/
function translate_entry(&$entry) {
$key = $entry->key();
return isset($this->entries[$key])? $this->entries[$key] : false;
}
/**
* @param string $singular
* @param string $context
* @return string
*/
function translate($singular, $context=null) {
$entry = new Translation_Entry(array('singular' => $singular, 'context' => $context));
$translated = $this->translate_entry($entry);
return ($translated && !empty($translated->translations))? $translated->translations[0] : $singular;
}
/**
* Given the number of items, returns the 0-based index of the plural form to use
*
* Here, in the base Translations class, the common logic for English is implemented:
* 0 if there is one element, 1 otherwise
*
* This function should be overrided by the sub-classes. For example MO/PO can derive the logic
* from their headers.
*
* @param integer $count number of items
*/
function select_plural_form($count) {
return 1 == $count? 0 : 1;
}
function get_plural_forms_count() {
return 2;
}
/**
* @param string $singular
* @param string $plural
* @param int $count
* @param string $context
*/
function translate_plural($singular, $plural, $count, $context = null) {
$entry = new Translation_Entry(array('singular' => $singular, 'plural' => $plural, 'context' => $context));
$translated = $this->translate_entry($entry);
$index = $this->select_plural_form($count);
$total_plural_forms = $this->get_plural_forms_count();
if ($translated && 0 <= $index && $index < $total_plural_forms &&
is_array($translated->translations) &&
isset($translated->translations[$index]))
return $translated->translations[$index];
else
return 1 == $count? $singular : $plural;
}
/**
* Merge $other in the current object.
*
* @param Object &$other Another Translation object, whose translations will be merged in this one
* @return void
**/
function merge_with(&$other) {
foreach( $other->entries as $entry ) {
$this->entries[$entry->key()] = $entry;
}
}
function merge_originals_with(&$other) {
foreach( $other->entries as $entry ) {
if ( !isset( $this->entries[$entry->key()] ) )
$this->entries[$entry->key()] = $entry;
else
$this->entries[$entry->key()]->merge_with($entry);
}
}
}
class Gettext_Translations extends Translations {
/**
* The gettext implementation of select_plural_form.
*
* It lives in this class, because there are more than one descendand, which will use it and
* they can't share it effectively.
*
* @param int $count
*/
function gettext_select_plural_form($count) {
if (!isset($this->_gettext_select_plural_form) || is_null($this->_gettext_select_plural_form)) {
list( $nplurals, $expression ) = $this->nplurals_and_expression_from_header($this->get_header('Plural-Forms'));
$this->_nplurals = $nplurals;
$this->_gettext_select_plural_form = $this->make_plural_form_function($nplurals, $expression);
}
return call_user_func($this->_gettext_select_plural_form, $count);
}
/**
* @param string $header
* @return array
*/
function nplurals_and_expression_from_header($header) {
if (preg_match('/^\s*nplurals\s*=\s*(\d+)\s*;\s+plural\s*=\s*(.+)$/', $header, $matches)) {
$nplurals = (int)$matches[1];
$expression = trim($this->parenthesize_plural_exression($matches[2]));
return array($nplurals, $expression);
} else {
return array(2, 'n != 1');
}
}
/**
* Makes a function, which will return the right translation index, according to the
* plural forms header
* @param int $nplurals
* @param string $expression
*/
function make_plural_form_function($nplurals, $expression) {
$expression = str_replace('n', '$n', $expression);
$func_body = "
\$index = (int)($expression);
return (\$index < $nplurals)? \$index : $nplurals - 1;";
return create_function('$n', $func_body);
}
/**
* Adds parentheses to the inner parts of ternary operators in
* plural expressions, because PHP evaluates ternary oerators from left to right
*
* @param string $expression the expression without parentheses
* @return string the expression with parentheses added
*/
function parenthesize_plural_exression($expression) {
$expression .= ';';
$res = '';
$depth = 0;
for ($i = 0; $i < strlen($expression); ++$i) {
$char = $expression[$i];
switch ($char) {
case '?':
$res .= ' ? (';
$depth++;
break;
case ':':
$res .= ') : (';
break;
case ';':
$res .= str_repeat(')', $depth) . ';';
$depth= 0;
break;
default:
$res .= $char;
}
}
return rtrim($res, ';');
}
/**
* @param string $translation
* @return array
*/
function make_headers($translation) {
$headers = array();
// sometimes \ns are used instead of real new lines
$translation = str_replace('\n', "\n", $translation);
$lines = explode("\n", $translation);
foreach($lines as $line) {
$parts = explode(':', $line, 2);
if (!isset($parts[1])) continue;
$headers[trim($parts[0])] = trim($parts[1]);
}
return $headers;
}
/**
* @param string $header
* @param string $value
*/
function set_header($header, $value) {
parent::set_header($header, $value);
if ('Plural-Forms' == $header) {
list( $nplurals, $expression ) = $this->nplurals_and_expression_from_header($this->get_header('Plural-Forms'));
$this->_nplurals = $nplurals;
$this->_gettext_select_plural_form = $this->make_plural_form_function($nplurals, $expression);
}
}
}
endif;
if ( !class_exists( 'NOOP_Translations' ) ):
/**
* Provides the same interface as Translations, but doesn't do anything
*/
class NOOP_Translations {
var $entries = array();
var $headers = array();
function add_entry($entry) {
return true;
}
function set_header($header, $value) {
}
function set_headers($headers) {
}
function get_header($header) {
return false;
}
function translate_entry(&$entry) {
return false;
}
/**
* @param string $singular
* @param string $context
*/
function translate($singular, $context=null) {
return $singular;
}
function select_plural_form($count) {
return 1 == $count? 0 : 1;
}
function get_plural_forms_count() {
return 2;
}
/**
* @param string $singular
* @param string $plural
* @param int $count
* @param string $context
*/
function translate_plural($singular, $plural, $count, $context = null) {
return 1 == $count? $singular : $plural;
}
function merge_with(&$other) {
}
}
endif;
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