<form method="POST">
    <h3>Editing: ManifestSerializer.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types = 1);
/*
 * This file is part of PharIo\Manifest.
 *
 * Copyright (c) Arne Blankerts &lt;arne@blankerts.de&gt;, Sebastian Heuer &lt;sebastian@phpeople.de&gt;, Sebastian Bergmann &lt;sebastian@phpunit.de&gt; and contributors
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 */
namespace PharIo\Manifest;

use PharIo\Version\AnyVersionConstraint;
use PharIo\Version\Version;
use PharIo\Version\VersionConstraint;
use XMLWriter;
use function count;
use function file_put_contents;
use function str_repeat;

/** @psalm-suppress MissingConstructor */
class ManifestSerializer {
    /** @var XMLWriter */
    private $xmlWriter;

    public function serializeToFile(Manifest $manifest, string $filename): void {
        file_put_contents(
            $filename,
            $this-&gt;serializeToString($manifest)
        );
    }

    public function serializeToString(Manifest $manifest): string {
        $this-&gt;startDocument();

        $this-&gt;addContains($manifest-&gt;getName(), $manifest-&gt;getVersion(), $manifest-&gt;getType());
        $this-&gt;addCopyright($manifest-&gt;getCopyrightInformation());
        $this-&gt;addRequirements($manifest-&gt;getRequirements());
        $this-&gt;addBundles($manifest-&gt;getBundledComponents());

        return $this-&gt;finishDocument();
    }

    private function startDocument(): void {
        $xmlWriter = new XMLWriter();
        $xmlWriter-&gt;openMemory();
        $xmlWriter-&gt;setIndent(true);
        $xmlWriter-&gt;setIndentString(str_repeat(' ', 4));
        $xmlWriter-&gt;startDocument('1.0', 'UTF-8');
        $xmlWriter-&gt;startElement('phar');
        $xmlWriter-&gt;writeAttribute('xmlns', 'https://phar.io/xml/manifest/1.0');

        $this-&gt;xmlWriter = $xmlWriter;
    }

    private function finishDocument(): string {
        $this-&gt;xmlWriter-&gt;endElement();
        $this-&gt;xmlWriter-&gt;endDocument();

        return $this-&gt;xmlWriter-&gt;outputMemory();
    }

    private function addContains(ApplicationName $name, Version $version, Type $type): void {
        $this-&gt;xmlWriter-&gt;startElement('contains');
        $this-&gt;xmlWriter-&gt;writeAttribute('name', $name-&gt;asString());
        $this-&gt;xmlWriter-&gt;writeAttribute('version', $version-&gt;getVersionString());

        switch (true) {
            case $type-&gt;isApplication(): {
                $this-&gt;xmlWriter-&gt;writeAttribute('type', 'application');

                break;
            }

            case $type-&gt;isLibrary(): {
                $this-&gt;xmlWriter-&gt;writeAttribute('type', 'library');

                break;
            }

            case $type-&gt;isExtension(): {
                $this-&gt;xmlWriter-&gt;writeAttribute('type', 'extension');
                /* @var $type Extension */
                $this-&gt;addExtension(
                    $type-&gt;getApplicationName(),
                    $type-&gt;getVersionConstraint()
                );

                break;
            }

            default: {
                $this-&gt;xmlWriter-&gt;writeAttribute('type', 'custom');
            }
        }

        $this-&gt;xmlWriter-&gt;endElement();
    }

    private function addCopyright(CopyrightInformation $copyrightInformation): void {
        $this-&gt;xmlWriter-&gt;startElement('copyright');

        foreach ($copyrightInformation-&gt;getAuthors() as $author) {
            $this-&gt;xmlWriter-&gt;startElement('author');
            $this-&gt;xmlWriter-&gt;writeAttribute('name', $author-&gt;getName());
            $this-&gt;xmlWriter-&gt;writeAttribute('email', $author-&gt;getEmail()-&gt;asString());
            $this-&gt;xmlWriter-&gt;endElement();
        }

        $license = $copyrightInformation-&gt;getLicense();

        $this-&gt;xmlWriter-&gt;startElement('license');
        $this-&gt;xmlWriter-&gt;writeAttribute('type', $license-&gt;getName());
        $this-&gt;xmlWriter-&gt;writeAttribute('url', $license-&gt;getUrl()-&gt;asString());
        $this-&gt;xmlWriter-&gt;endElement();

        $this-&gt;xmlWriter-&gt;endElement();
    }

    private function addRequirements(RequirementCollection $requirementCollection): void {
        $phpRequirement = new AnyVersionConstraint();
        $extensions     = [];

        foreach ($requirementCollection as $requirement) {
            if ($requirement instanceof PhpVersionRequirement) {
                $phpRequirement = $requirement-&gt;getVersionConstraint();

                continue;
            }

            if ($requirement instanceof PhpExtensionRequirement) {
                $extensions[] = $requirement-&gt;asString();
            }
        }

        $this-&gt;xmlWriter-&gt;startElement('requires');
        $this-&gt;xmlWriter-&gt;startElement('php');
        $this-&gt;xmlWriter-&gt;writeAttribute('version', $phpRequirement-&gt;asString());

        foreach ($extensions as $extension) {
            $this-&gt;xmlWriter-&gt;startElement('ext');
            $this-&gt;xmlWriter-&gt;writeAttribute('name', $extension);
            $this-&gt;xmlWriter-&gt;endElement();
        }

        $this-&gt;xmlWriter-&gt;endElement();
        $this-&gt;xmlWriter-&gt;endElement();
    }

    private function addBundles(BundledComponentCollection $bundledComponentCollection): void {
        if (count($bundledComponentCollection) === 0) {
            return;
        }
        $this-&gt;xmlWriter-&gt;startElement('bundles');

        foreach ($bundledComponentCollection as $bundledComponent) {
            $this-&gt;xmlWriter-&gt;startElement('component');
            $this-&gt;xmlWriter-&gt;writeAttribute('name', $bundledComponent-&gt;getName());
            $this-&gt;xmlWriter-&gt;writeAttribute('version', $bundledComponent-&gt;getVersion()-&gt;getVersionString());
            $this-&gt;xmlWriter-&gt;endElement();
        }

        $this-&gt;xmlWriter-&gt;endElement();
    }

    private function addExtension(ApplicationName $applicationName, VersionConstraint $versionConstraint): void {
        $this-&gt;xmlWriter-&gt;startElement('extension');
        $this-&gt;xmlWriter-&gt;writeAttribute('for', $applicationName-&gt;asString());
        $this-&gt;xmlWriter-&gt;writeAttribute('compatible', $versionConstraint-&gt;asString());
        $this-&gt;xmlWriter-&gt;endElement();
    }
}
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