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