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<?php |
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namespace JosephNC\Translation; |
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use Illuminate\Contracts\Foundation\Application; |
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use Illuminate\Support\Facades\Log; |
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use Carbon\Carbon; |
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use Exception; |
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use InvalidArgumentException; |
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use UnexpectedValueException; |
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use GoogleTranslate\Client as T1; |
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use Stichoza\GoogleTranslate\GoogleTranslate as T2; |
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class Translation |
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{ |
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/** |
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* Holds the app configuration. |
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* |
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* @access protected |
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* @var Illuminate\Config\Repository |
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*/ |
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public $config; |
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/** |
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* Holds the current request. |
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* |
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* @access protected |
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* @var Illuminate\Http\Request |
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*/ |
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protected $request; |
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/** |
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* Represents the translation model |
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* |
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* @access protected |
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* @var JosephNC\Translation\Models\Translation |
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*/ |
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protected $translationModel; |
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/** |
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* Translation constructor |
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* |
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* @access public |
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* @var Illuminate\Contracts\Foundation\Application |
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*/ |
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public function __construct( Application $app ) |
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{ |
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$this->config = $app->make('config'); |
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$this->request = app( \Illuminate\Http\Request::class ); |
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$this->translationModel = $app->make($this->getTranslationModel()); |
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} |
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/** |
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* Returns the API Key |
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* |
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* @return string |
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*/ |
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public function getApiKey() : string |
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{ |
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return (string) $this->config->get( 'translation.key', '' ); |
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} |
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/** |
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* Returns the locale |
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* |
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* @return string |
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*/ |
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public function getLocale() : string |
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{ |
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$locale = $_SESSION['locale'] ?? $this->getDefaultLocale(); |
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return (string) ( empty( $locale ) ? $this->getDefaultLocale() : $locale ); |
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} |
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/** |
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* Returns the array of configuration locales. |
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* |
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* @return array |
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*/ |
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protected function getLocales() : array |
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{ |
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return (array) $this->config->get( 'translation.locales' ); |
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} |
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/** |
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* Returns the default locale from the configuration. |
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* |
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* @access protected |
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* |
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* @return string |
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*/ |
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protected function getDefaultLocale() : string |
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{ |
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$locale = $this->config->get( 'app.locale', $this->config->get('app.fallback_locale') ); |
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$locale = $this->localeExist( $locale ) ? $locale : 'en'; |
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return (string) $locale; |
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} |
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/** |
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* Returns the translation model from the configuration. |
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* |
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* @access protected |
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* |
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* @return string |
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*/ |
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protected function getTranslationModel() : string |
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{ |
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return (string) $this->config->get('translation.models.translation', Models\Translation::class); |
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} |
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/** |
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* Returns the current route translation prefix |
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* using the srequest segment set in the config |
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* |
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* @return string |
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*/ |
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public function getRoutePrefix() : string |
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{ |
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$locale = (string) $this->request->segment( $this->getRequestSegment() ); |
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return $this->localeExist( $locale ) ? $locale : ''; |
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} |
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/** |
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* Returns the request segment to retrieve the locale from. |
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* |
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* @return int |
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*/ |
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protected function getRequestSegment() : int |
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{ |
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return $this->config->get( 'translation.request_segment', 1 ); |
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} |
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/** |
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* Sets the locale |
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* |
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* @param string $locale The locale to use. Defaults to 'en'. |
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* @throws InvalidArgumentException|Exception |
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*/ |
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public function setLocale( string $locale = 'en' ) |
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{ |
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if ( ! empty( $locale ) && ! $this->localeExist( $locale ) ) { |
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$message = 'Invalid Argument! Locale passed does not exist.'; |
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throw new InvalidArgumentException( $message ); |
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} |
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$_SESSION['locale'] = $locale; |
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} |
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/** |
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* Checks if the locale passed is exist |
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* |
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* @param string $locale The locale to check |
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* |
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* @return bool |
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*/ |
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public function localeExist( string $locale = 'en' ) : bool |
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{ |
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return array_key_exists( $locale, (array) $this->getLocales() ) ? true : false; |
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} |
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/** |
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* Translate the text |
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* |
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* @access public |
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* |
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* @param string $text |
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* @param array $replacements |
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* @param string $to_locale |
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* |
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* @throws InvalidArgumentException |
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* |
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* @return string The translated text. |
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*/ |
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public function translate( string $text, array $replacements = [], string $to_locale = '' ) : string |
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{ |
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$do_translate = false; |
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$data = []; |
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$locale = 'en'; |
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$to_locale = empty( $to_locale ) ? $this->getLocale() : $to_locale; |
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$text = preg_replace( '/:([a-z]+)/i', '__$1__', $text ); // Turn replacements to placeholders |
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$trans = $text; |
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$translations = []; |
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if ( ! array_key_exists( $to_locale, $this->getLocales() ) ) { |
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$message = 'Invalid Argument. Locale not found for translation.'; |
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throw new InvalidArgumentException( $message ); |
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} |
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if ( empty( $text ) ) return $text; |
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// Get translation data from session or database |
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$translations = (array) ($_SESSION['__translations'] ?? $this->translationModel->pluck( 'data', 'text' )->toArray()); |
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if ( ( empty( $translations ) || ! isset( $translations[ $text ] ) ) && $locale != $to_locale ) { |
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$do_translate = true; |
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} else if ( isset( $translations[ $text ] ) ) { |
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$data = json_decode( $translations[ $text ], true ); |
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if ( $locale != $to_locale ) { |
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$trans = $data[ $to_locale ] ?? ''; |
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$do_translate = ! empty( $trans ) && $trans == $text ? true : ( empty( $trans ) ? true : false ); |
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} |
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} |
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if ( $do_translate ) { |
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// Let's request for translation |
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try { |
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$trans = (new T1( $this->getApiKey() ) )->translate( $text, $to_locale, $locale ); |
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} catch (\Exception $e) { |
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Log::info( $e->getMessage() ); |
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$trans = T2::trans( $text, $to_locale, $locale ); |
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} |
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} |
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$data = array_merge( $data, [ $to_locale => $trans ] ); |
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$translations[ $text ] = json_encode( $data ); |
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// Save to session |
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$_SESSION['__translations'] = $translations; |
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return (string) ( empty( $replacements ) ? $trans : $this->makeReplacements( $trans, $replacements ) ); |
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} |
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/** |
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* Replaces placeholders with its real value |
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* |
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* @access private |
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* @param string $text The text having the placeholder |
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* @param array $replacements The replacement values in array |
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* |
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* @return string The replaced text |
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*/ |
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private function makeReplacements( string $text, array $replacements ) : string |
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{ |
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$keys = strtolower( '__' . join( '__,__', array_keys( $replacements ) ) . '__' ); |
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$search = explode( ',', $keys ); |
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$replace = array_values( $replacements ); |
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return (string) str_replace( $search, $replace, $text ); |
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} |
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/** |
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* Runs on page shutdown |
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* |
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* @access public |
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*/ |
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public function shutdown() |
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{ |
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// Get translation data from session |
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$new_translations = $_SESSION['__translations'] ?? []; |
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$old_translations = (array) $this->translationModel->pluck( 'data', 'text' )->toArray(); |
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if ( json_encode( $new_translations ) == json_encode( $old_translations ) ) return; |
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$now = Carbon::now('utc')->toDateTimeString(); |
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$insert = $update = []; |
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if ( empty( $new_translations ) ) return; |
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foreach ($new_translations as $text => $data) { |
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if ( isset( $old_translations[ $text ] ) ) { |
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if ( $old_translations[ $text ] == $data ) continue; |
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// Update old |
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$this->translationModel->where( 'text', $text )->update( [ 'data' => $data ] ); |
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continue; |
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} |
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// Create new |
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$insert[] = [ |
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'text' => $text, |
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'data' => $data, |
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'created_at' => $now, |
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'updated_at' => $now |
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]; |
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} |
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if ( ! empty( $insert ) ) $this->translationModel->insert( $insert ); |
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// Remove the translation |
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if ( isset( $_SESSION['__translations'] ) ) unset( $_SESSION['__translations'] ); |
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} |
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} |
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