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<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <[email protected]>
 *     Jordi Boggiano <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Platform;

/**
 * @author Lars Strojny <[email protected]>
 */
class Version
{
    /**
     * @param  string      $opensslVersion
     * @param  bool        $isFips
     * @return string|null
     */
    public static function parseOpenssl($opensslVersion, &$isFips)
    {
        $isFips = false;

        if (!preg_match('/^(?<version>[0-9.]+)(?<patch>[a-z]{0,2})?(?<suffix>(?:-?(?:dev|pre|alpha|beta|rc|fips)[\d]*)*)?(?<garbage>-\w+)?$/', $opensslVersion, $matches)) {
            return null;
        }

        $isFips = strpos($matches['suffix'], 'fips') !== false;
        $suffix = strtr('-'.ltrim($matches['suffix'], '-'), array('-fips' => '', '-pre' => '-alpha'));
        $patch = self::convertAlphaVersionToIntVersion($matches['patch']);

        return rtrim($matches['version'].'.'.$patch.$suffix, '-');
    }

    /**
     * @param  string      $libjpegVersion
     * @return string|null
     */
    public static function parseLibjpeg($libjpegVersion)
    {
        if (!preg_match('/^(?<major>\d+)(?<minor>[a-z]*)$/', $libjpegVersion, $matches)) {
            return null;
        }

        return $matches['major'].'.'.self::convertAlphaVersionToIntVersion($matches['minor']);
    }

    /**
     * @param  string      $zoneinfoVersion
     * @return string|null
     */
    public static function parseZoneinfoVersion($zoneinfoVersion)
    {
        if (!preg_match('/^(?<year>\d{4})(?<revision>[a-z]*)$/', $zoneinfoVersion, $matches)) {
            return null;
        }

        return $matches['year'].'.'.self::convertAlphaVersionToIntVersion($matches['revision']);
    }

    /**
     * "" => 0, "a" => 1, "zg" => 33
     *
     * @param  string $alpha
     * @return int
     */
    private static function convertAlphaVersionToIntVersion($alpha)
    {
        return strlen($alpha) * (-ord('a') + 1) + array_sum(array_map('ord', str_split($alpha)));
    }

    /**
     * @param  int    $versionId
     * @return string
     */
    public static function convertLibxpmVersionId($versionId)
    {
        return self::convertVersionId($versionId, 100);
    }

    /**
     * @param  int    $versionId
     * @return string
     */
    public static function convertOpenldapVersionId($versionId)
    {
        return self::convertVersionId($versionId, 100);
    }

    /**
     * @param int $versionId
     * @param int $base
     *
     * @return string
     */
    private static function convertVersionId($versionId, $base)
    {
        return sprintf(
            '%d.%d.%d',
            $versionId / ($base * $base),
            (int) ($versionId / $base) % $base,
            $versionId % $base
        );
    }
}