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• File: translations.php

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<?php
/**
 * This is a modified version of the POMO library included with WordPress. The WordPress copyright has been included
 * for attribution.
 */

/*
WordPress - Web publishing software

This program 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.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

This program incorporates work covered by the following copyright and
permission notices:

Wherever third party code has been used, credit has been given in the code's
  comments.

b2 is released under the GPL

and

WordPress - Web publishing software

WordPress is released under the GPL
 */

/**
 * Class for a set of entries for translation and their associated headers
 *
 * @version $Id: translations.php 1157 2015-11-20 04:30:11Z dd32 $
 * @package pomo
 * @subpackage translations
 */

require_once __DIR__ . '/plural-forms.php';
require_once __DIR__ . '/entry.php';

if ( ! class_exists( 'wfTranslations', false ) ) :
	class wfTranslations {
		var $entries = array();
		var $headers = array();

/**
		 * Add entry to the PO structure
		 *
		 * @param array|wfTranslation_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 wfTranslation_Entry( $entry );
			}
			$key = $entry->key();
			if ( false === $key ) {
				return false;
			}
			$this->entries[ $key ] = &$entry;
			return true;
		}

/**
		 * @param array|wfTranslation_Entry $entry
		 * @return bool
		 */
		function add_entry_or_merge( $entry ) {
			if ( is_array( $entry ) ) {
				$entry = new wfTranslation_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 wfTranslation_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 wfTranslation_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 overridden by the subclasses. 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;
		}

/**
		 * @return int
		 */
		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 wfTranslation_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 $other Another Translation object, whose translations will be merged in this one (passed by reference).
		 * @return void
		 */
		function merge_with( &$other ) {
			foreach ( $other->entries as $entry ) {
				$this->entries[ $entry->key() ] = $entry;
			}
		}

/**
		 * @param object $other
		 */
		function merge_originals_with( &$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 wfGettext_Translations extends wfTranslations {

private $_gettext_select_plural_form = null;

/**
		 * 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( $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 ) {
			try {
				$handler = new wfPlural_Forms( rtrim( $expression, ';' ) );
				return array( $handler, 'get' );
			} catch ( Exception $e ) {
				// Fall back to default plural-form function.
				return $this->make_plural_form_function( 2, 'n != 1' );
			}
		}

/**
		 * 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 \n's 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( 'wfNOOP_Translations', false ) ) :
	/**
	 * Provides the same interface as Translations, but doesn't do anything
	 */
	class wfNOOP_Translations {
		var $entries = array();
		var $headers = array();

function add_entry( $entry ) {
			return true;
		}

/**
		 * @param string $header
		 * @param string $value
		 */
		function set_header( $header, $value ) {
		}

/**
		 * @param array $headers
		 */
		function set_headers( $headers ) {
		}

/**
		 * @param string $header
		 * @return false
		 */
		function get_header( $header ) {
			return false;
		}

/**
		 * @param wfTranslation_Entry $entry
		 * @return false
		 */
		function translate_entry( &$entry ) {
			return false;
		}

/**
		 * @param string $singular
		 * @param string $context
		 */
		function translate( $singular, $context = null ) {
			return $singular;
		}

/**
		 * @param int $count
		 * @return bool
		 */
		function select_plural_form( $count ) {
			return 1 == $count ? 0 : 1;
		}

/**
		 * @return int
		 */
		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;
		}

/**
		 * @param object $other
		 */
		function merge_with( &$other ) {
		}
	}
endif;

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