ComposerPackageModifier.php

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<?php

use Composer\Package\Link;
use Composer\Package\LinkConstraint\VersionConstraint;
use Composer\Package\Package;

class ComposerPackageModifier {

    const MEDIAWIKI_PACKAGE_NAME = 'mediawiki/mediawiki';

    protected $package;
    protected $versionNormalizer;
    protected $versionFetcher;

    public function __construct( Package $package,
        ComposerVersionNormalizer $versionNormalizer, MediaWikiVersionFetcher $versionFetcher
    ) {
        $this->package = $package;
        $this->versionNormalizer = $versionNormalizer;
        $this->versionFetcher = $versionFetcher;
    }

    public function setProvidesMediaWiki() {
        $this->setLinkAsProvides( $this->newMediaWikiLink() );
    }

    private function setLinkAsProvides( Link $link ) {
        $this->package->setProvides( array( $link ) );
    }

    private function newMediaWikiLink() {
        $version = $this->getMediaWikiVersionConstraint();

        $link = new Link(
            '__root__',
            self::MEDIAWIKI_PACKAGE_NAME,
            $version,
            'provides',
            $version->getPrettyString()
        );

        return $link;
    }

    private function getMediaWikiVersionConstraint() {
        $mvVersion = $this->versionFetcher->fetchVersion();
        $mvVersion = $this->versionNormalizer->normalizeSuffix( $mvVersion );

        $version = new VersionConstraint(
            '==',
            $this->versionNormalizer->normalizeLevelCount( $mvVersion )
        );
        $version->setPrettyString( $mvVersion );

        return $version;
    }

}