Generator.php

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<?php
namespace Magento\Setup\Module\I18n\Pack;

use Magento\Setup\Module\I18n\Dictionary;
use Magento\Setup\Module\I18n\Factory;
use Magento\Setup\Module\I18n\Pack;

class Generator
{
    protected $dictionaryLoader;

    protected $packWriter;

    protected $factory;

    public function __construct(
        Dictionary\Loader\FileInterface $dictionaryLoader,
        Pack\WriterInterface $packWriter,
        Factory $factory
    ) {
        $this->dictionaryLoader = $dictionaryLoader;
        $this->packWriter = $packWriter;
        $this->factory = $factory;
    }

    public function generate(
        $dictionaryPath,
        $locale,
        $mode = WriterInterface::MODE_REPLACE,
        $allowDuplicates = false
    ) {
        $locale = $this->factory->createLocale($locale);
        $dictionary = $this->dictionaryLoader->load($dictionaryPath);

        $phrases = $dictionary->getPhrases();
        if (!is_array($phrases) || !count($phrases)) {
            throw new \UnexpectedValueException('No phrases have been found by the specified path.');
        }

        if (!$allowDuplicates && ($duplicates = $dictionary->getDuplicates())) {
            throw new \RuntimeException(
                "Duplicated translation is found, but it is not allowed.\n"
                . $this->createDuplicatesPhrasesError($duplicates)
            );
        }

        $this->packWriter->writeDictionary($dictionary, $locale, $mode);
    }

    protected function createDuplicatesPhrasesError($duplicates)
    {
        $error = '';
        foreach ($duplicates as $phrases) {
            $phrase = $phrases[0];
            $error .= sprintf(
                "The phrase \"%s\" is translated in %d places.\n",
                $phrase->getPhrase(),
                count($phrases)
            );
        }
        return $error;
    }
}