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Filename : export-plural-rules
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<?php

use Gettext\Languages\Exporter\Exporter;
use Gettext\Languages\Language;

// Let's start by imposing that we don't accept any error or warning.
// This is a really life-saving approach.
error_reporting(E_ALL);
set_error_handler(function ($errno, $errstr, $errfile, $errline) {
    fprintf(STDERR, "${errstr}\nFile: ${errfile}\nLine: ${errline}\nCode: ${errno}\n");
    die(5);
});

require_once dirname(__DIR__) . '/src/autoloader.php';

// Parse the command line options
Enviro::initialize();

try {
    if (isset(Enviro::$languages)) {
        $languages = array();
        foreach (Enviro::$languages as $languageId) {
            $language = Language::getById($languageId);
            if (!isset($language)) {
                throw new Exception("Unable to find the language with id '${languageId}'");
            }
            $languages[] = $language;
        }
    } else {
        $languages = Language::getAll();
    }
    if (Enviro::$reduce) {
        $languages = Enviro::reduce($languages);
    }
    if (Enviro::$noExtraParenthesis) {
        $languages = array_map(
            function (Language $language) {
                $language->formula = $language->buildFormula(true);

                return $language;
            },
            $languages
        );
    }
    if (isset(Enviro::$outputFilename)) {
        echo call_user_func(array(Exporter::getExporterClassName(Enviro::$outputFormat), 'toFile'), $languages, Enviro::$outputFilename, array('us-ascii' => Enviro::$outputUSAscii));
    } else {
        echo call_user_func(array(Exporter::getExporterClassName(Enviro::$outputFormat), 'toString'), $languages, array('us-ascii' => Enviro::$outputUSAscii));
    }
} catch (Exception $x) {
    fprintf(STDERR, $x->getMessage() . "\n");
    fprintf(STDERR, "Trace:\n");
    fprintf(STDERR, $x->getTraceAsString() . "\n");
    die(4);
}

die(0);

/**
 * Helper class to handle command line options.
 */
class Enviro
{
    /**
     * Shall the output contain only US-ASCII characters?
     *
     * @var bool
     */
    public static $outputUSAscii;

    /**
     * The output format.
     *
     * @var string
     */
    public static $outputFormat;

    /**
     * Output file name.
     *
     * @var string
     */
    public static $outputFilename;

    /**
     * List of wanted language IDs; it not set: all languages will be returned.
     *
     * @var array|null
     */
    public static $languages;

    /**
     * Reduce the language list to the minimum common denominator.
     *
     * @var bool
     */
    public static $reduce;

    /**
     * Omit extra parenthesis in plural rule formulas.
     *
     * @var bool
     */
    public static $noExtraParenthesis;

    /**
     * Parse the command line options.
     */
    public static function initialize()
    {
        global $argv;
        self::$outputUSAscii = false;
        self::$outputFormat = null;
        self::$outputFilename = null;
        self::$languages = null;
        self::$reduce = null;
        self::$noExtraParenthesis = false;
        $exporters = Exporter::getExporters();
        if (isset($argv) && is_array($argv)) {
            foreach ($argv as $argi => $arg) {
                if ($argi === 0) {
                    continue;
                }
                if (is_string($arg)) {
                    $argLC = trim(strtolower($arg));
                    switch ($argLC) {
                        case '-h':
                        case '--help':
                            self::showSyntax();
                            die(0);
                        case '--us-ascii':
                            self::$outputUSAscii = true;
                            break;
                        case '--reduce=yes':
                            self::$reduce = true;
                            break;
                        case '--reduce=no':
                            self::$reduce = false;
                            break;
                        case '--parenthesis=yes':
                            self::$noExtraParenthesis = false;
                            break;
                        case '--parenthesis=no':
                            self::$noExtraParenthesis = true;
                            break;
                        default:
                            if (preg_match('/^--output=.+$/', $argLC)) {
                                if (isset(self::$outputFilename)) {
                                    fprintf(STDERR, "The output file name has been specified more than once!\n");
                                    self::showSyntax();
                                    die(3);
                                }
                                list(, self::$outputFilename) = explode('=', $arg, 2);
                                self::$outputFilename = trim(self::$outputFilename);
                            } elseif (preg_match('/^--languages?=.+$/', $argLC)) {
                                list(, $s) = explode('=', $arg, 2);
                                $list = explode(',', $s);
                                if (is_array(self::$languages)) {
                                    self::$languages = array_merge(self::$languages, $list);
                                } else {
                                    self::$languages = $list;
                                }
                            } elseif (isset($exporters[$argLC])) {
                                if (isset(self::$outputFormat)) {
                                    fprintf(STDERR, "The output format has been specified more than once!\n");
                                    self::showSyntax();
                                    die(3);
                                }
                                self::$outputFormat = $argLC;
                            } else {
                                fprintf(STDERR, "Unknown option: ${arg}\n");
                                self::showSyntax();
                                die(2);
                            }
                            break;
                    }
                }
            }
        }
        if (!isset(self::$outputFormat)) {
            self::showSyntax();
            die(1);
        }
        if (isset(self::$languages)) {
            self::$languages = array_values(array_unique(self::$languages));
        }
        if (!isset(self::$reduce)) {
            self::$reduce = isset(self::$languages) ? false : true;
        }
    }

    /**
     * Write out the syntax.
     */
    public static function showSyntax()
    {
        $basename = basename(__FILE__);
        $exporters = array_keys(Exporter::getExporters(true));
        $exporterList = implode('|', $exporters);
        fprintf(STDERR, <<<EOT
Syntax:
    ${basename} [-h|--help] [--us-ascii] [--languages=<LanguageId>[,<LanguageId>,...]] [--reduce=yes|no] [--parenthesis=yes|no] [--output=<file name>] <${exporterList}>

Where:
    --help
        show this help message.

    --us-ascii
        if specified, the output will contain only US-ASCII characters.

    --languages(or --language)
        export only the specified language codes.
        Separate languages with commas; you can also use this argument
        more than once; it's case insensitive and accepts both '_' and
        '-' as locale chunks separator (eg we accept 'it_IT' as well as
        'it-it').
    --reduce
        if set to yes the output won't contain languages with the same
        base language and rules.
        For instance nl_BE ('Flemish') will be omitted because it's the
        same as nl ('Dutch').
        Defaults to 'no' if --languages is specified, to 'yes' otherwise.
    --parenthesis
        if set to no, extra parenthesis will be omitted in generated
        plural rules formulas.
        Those extra parenthesis are needed to create a PHP-compatible
        formula.
        Defaults to 'yes'
    --output
        if specified, the output will be saved to <file name>. If not
        specified we'll output to standard output.

Output formats

EOT
        );
        $len = max(array_map('strlen', $exporters));
        foreach ($exporters as $exporter) {
            fprintf(STDERR, '    ' . str_pad($exporter, $len) . ': ' . Exporter::getExporterDescription($exporter) . "\n");
        }
        fprintf(STDERR, "\n");
    }

    /**
     * Reduce a language list to the minimum common denominator.
     *
     * @param Language[] $languages
     *
     * @return Language[]
     */
    public static function reduce($languages)
    {
        for ($numChunks = 3; $numChunks >= 2; $numChunks--) {
            $filtered = array();
            foreach ($languages as $language) {
                $chunks = explode('_', $language->id);
                $compatibleFound = false;
                if (count($chunks) === $numChunks) {
                    $categoriesHash = serialize($language->categories);
                    $otherIds = array();
                    $otherIds[] = $chunks[0];
                    for ($k = 2; $k < $numChunks; $k++) {
                        $otherIds[] = $chunks[0] . '_' . $chunks[$numChunks - 1];
                    }

                    foreach ($languages as $check) {
                        foreach ($otherIds as $otherId) {
                            if (($check->id === $otherId) && ($check->formula === $language->formula) && (serialize($check->categories) === $categoriesHash)) {
                                $compatibleFound = true;
                                break;
                            }
                        }
                        if ($compatibleFound === true) {
                            break;
                        }
                    }
                }
                if (!$compatibleFound) {
                    $filtered[] = $language;
                }
            }
            $languages = $filtered;
        }

        return $languages;
    }
}