380 lines
9.4 KiB
PHP
380 lines
9.4 KiB
PHP
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<?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 1157 2015-11-20 04:30:11Z dd32 $
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* @package pomo
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* @subpackage translations
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*/
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require_once __DIR__ . '/plural-forms.php';
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require_once __DIR__ . '/entry.php';
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if ( ! class_exists( 'Translations', false ) ) :
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class Translations {
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public $entries = array();
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public $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 array|Translation_Entry $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 === $key ) {
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return false;
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}
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$this->entries[ $key ] = &$entry;
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return true;
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}
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/**
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* @param array|Translation_Entry $entry
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* @return bool
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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 ) {
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return false;
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}
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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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}
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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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/**
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* @param array $headers
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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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/**
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* @param string $header
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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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/**
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* @param Translation_Entry $entry
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*/
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function translate_entry( &$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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/**
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* @param string $singular
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* @param string $context
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* @return string
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*/
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function translate( $singular, $context = null ) {
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$entry = new Translation_Entry(
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array(
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'singular' => $singular,
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'context' => $context,
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)
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);
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$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 implemented:
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* 0 if there is one element, 1 otherwise
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*
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* This function should be overridden by the subclasses. For example MO/PO can derive the logic
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* from their headers.
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*
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* @param int $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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/**
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* @return int
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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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/**
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* @param string $singular
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* @param string $plural
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* @param int $count
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* @param string $context
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*/
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function translate_plural( $singular, $plural, $count, $context = null ) {
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$entry = new Translation_Entry(
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array(
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'singular' => $singular,
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'plural' => $plural,
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'context' => $context,
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)
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);
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$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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/**
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* Merge $other in the current object.
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*
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* @param Object $other Another Translation object, whose translations will be merged in this one (passed by reference).
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* @return void
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*/
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function merge_with( &$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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/**
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* @param object $other
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*/
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function merge_originals_with( &$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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}
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class Gettext_Translations extends Translations {
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/**
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* The gettext implementation 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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* @param int $count
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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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/**
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* @param string $header
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* @return array
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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( $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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* @param int $nplurals
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* @param string $expression
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*/
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function make_plural_form_function( $nplurals, $expression ) {
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try {
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$handler = new Plural_Forms( rtrim( $expression, ';' ) );
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return array( $handler, 'get' );
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} catch ( Exception $e ) {
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// Fall back to default plural-form function.
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return $this->make_plural_form_function( 2, 'n != 1' );
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}
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}
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/**
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* Adds parentheses 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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/**
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* @param string $translation
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* @return array
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*/
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function make_headers( $translation ) {
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$headers = array();
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// Sometimes \n's 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( $parts[1] ) ) {
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continue;
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}
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$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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/**
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* @param string $header
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* @param string $value
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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', false ) ) :
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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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public $entries = array();
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public $headers = array();
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function add_entry( $entry ) {
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return true;
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}
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/**
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* @param string $header
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* @param string $value
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*/
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function set_header( $header, $value ) {
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}
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/**
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* @param array $headers
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*/
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function set_headers( $headers ) {
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}
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/**
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* @param string $header
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* @return false
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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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/**
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* @param Translation_Entry $entry
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* @return false
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*/
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function translate_entry( &$entry ) {
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return false;
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}
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/**
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* @param string $singular
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* @param string $context
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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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/**
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* @param int $count
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* @return bool
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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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/**
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* @return int
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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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/**
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* @param string $singular
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* @param string $plural
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* @param int $count
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* @param string $context
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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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/**
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* @param object $other
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*/
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function merge_with( &$other ) {
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}
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}
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endif;
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