CoreVersionChecker.php

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<?php

use Composer\Semver\VersionParser;
use Composer\Semver\Constraint\Constraint;

class CoreVersionChecker {

    private $coreVersion = false;

    private $versionParser;

    public function __construct( $coreVersion ) {
        $this->versionParser = new VersionParser();
        try {
            $this->coreVersion = new Constraint(
                '==',
                $this->versionParser->normalize( $coreVersion )
            );
        } catch ( UnexpectedValueException $e ) {
            // Non-parsable version, don't fatal.
        }
    }

    public function check( $constraint ) {
        if ( $this->coreVersion === false ) {
            // Couldn't parse the core version, so we can't check anything
            return true;
        }

        return $this->versionParser->parseConstraints( $constraint )
            ->matches( $this->coreVersion );
    }
}