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<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer;

use Composer\Autoload\ClassLoader;
use Composer\Semver\VersionParser;

/**
 * This class is copied in every Composer installed project and available to all
 *
 * See also https://getcomposer.org/doc/07-runtime.md#installed-versions
 *
 * To require its presence, you can require `composer-runtime-api ^2.0`
 *
 * @final
 */
class InstalledVersions
{
	/**
	 * @var mixed[]|null
	 * @psalm-var array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>}|array{}|null
	 */
	private static $installed;

	/**
	 * @var bool|null
	 */
	private static $canGetVendors;

	/**
	 * @var array[]
	 * @psalm-var array<string, array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>}>
	 */
	private static $installedByVendor = array();

	/**
	 * Returns a list of all package names which are present, either by being installed, replaced or provided
	 *
	 * @return string[]
	 * @psalm-return list<string>
	 */
	public static function getInstalledPackages()
	{
		$packages = array();
		foreach (self::getInstalled() as $installed) {
			$packages[] = array_keys($installed['versions']);
		}

		if (1 === \count($packages)) {
			return $packages[0];
		}

		return array_keys(array_flip(\call_user_func_array('array_merge', $packages)));
	}

	/**
	 * Returns a list of all package names with a specific type e.g. 'library'
	 *
	 * @param  string   $type
	 * @return string[]
	 * @psalm-return list<string>
	 */
	public static function getInstalledPackagesByType($type)
	{
		$packagesByType = array();

		foreach (self::getInstalled() as $installed) {
			foreach ($installed['versions'] as $name => $package) {
				if (isset($package['type']) && $package['type'] === $type) {
					$packagesByType[] = $name;
				}
			}
		}

		return $packagesByType;
	}

	/**
	 * Checks whether the given package is installed
	 *
	 * This also returns true if the package name is provided or replaced by another package
	 *
	 * @param  string $packageName
	 * @param  bool   $includeDevRequirements
	 * @return bool
	 */
	public static function isInstalled($packageName, $includeDevRequirements = true)
	{
		foreach (self::getInstalled() as $installed) {
			if (isset($installed['versions'][$packageName])) {
				return $includeDevRequirements || !isset($installed['versions'][$packageName]['dev_requirement']) || $installed['versions'][$packageName]['dev_requirement'] === false;
			}
		}

		return false;
	}

	/**
	 * Checks whether the given package satisfies a version constraint
	 *
	 * e.g. If you want to know whether version 2.3+ of package foo/bar is installed, you would call:
	 *
	 *   Composer\InstalledVersions::satisfies(new VersionParser, 'foo/bar', '^2.3')
	 *
	 * @param  VersionParser $parser      Install composer/semver to have access to this class and functionality
	 * @param  string        $packageName
	 * @param  string|null   $constraint  A version constraint to check for, if you pass one you have to make sure composer/semver is required by your package
	 * @return bool
	 */
	public static function satisfies(VersionParser $parser, $packageName, $constraint)
	{
		$constraint = $parser->parseConstraints((string) $constraint);
		$provided = $parser->parseConstraints(self::getVersionRanges($packageName));

		return $provided->matches($constraint);
	}

	/**
	 * Returns a version constraint representing all the range(s) which are installed for a given package
	 *
	 * It is easier to use this via isInstalled() with the $constraint argument if you need to check
	 * whether a given version of a package is installed, and not just whether it exists
	 *
	 * @param  string $packageName
	 * @return string Version constraint usable with composer/semver
	 */
	public static function getVersionRanges($packageName)
	{
		foreach (self::getInstalled() as $installed) {
			if (!isset($installed['versions'][$packageName])) {
				continue;
			}

			$ranges = array();
			if (isset($installed['versions'][$packageName]['pretty_version'])) {
				$ranges[] = $installed['versions'][$packageName]['pretty_version'];
			}
			if (array_key_exists('aliases', $installed['versions'][$packageName])) {
				$ranges = array_merge($ranges, $installed['versions'][$packageName]['aliases']);
			}
			if (array_key_exists('replaced', $installed['versions'][$packageName])) {
				$ranges = array_merge($ranges, $installed['versions'][$packageName]['replaced']);
			}
			if (array_key_exists('provided', $installed['versions'][$packageName])) {
				$ranges = array_merge($ranges, $installed['versions'][$packageName]['provided']);
			}

			return implode(' || ', $ranges);
		}

		throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
	}

	/**
	 * @param  string      $packageName
	 * @return string|null If the package is being replaced or provided but is not really installed, null will be returned as version, use satisfies or getVersionRanges if you need to know if a given version is present
	 */
	public static function getVersion($packageName)
	{
		foreach (self::getInstalled() as $installed) {
			if (!isset($installed['versions'][$packageName])) {
				continue;
			}

			if (!isset($installed['versions'][$packageName]['version'])) {
				return null;
			}

			return $installed['versions'][$packageName]['version'];
		}

		throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
	}

	/**
	 * @param  string      $packageName
	 * @return string|null If the package is being replaced or provided but is not really installed, null will be returned as version, use satisfies or getVersionRanges if you need to know if a given version is present
	 */
	public static function getPrettyVersion($packageName)
	{
		foreach (self::getInstalled() as $installed) {
			if (!isset($installed['versions'][$packageName])) {
				continue;
			}

			if (!isset($installed['versions'][$packageName]['pretty_version'])) {
				return null;
			}

			return $installed['versions'][$packageName]['pretty_version'];
		}

		throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
	}

	/**
	 * @param  string      $packageName
	 * @return string|null If the package is being replaced or provided but is not really installed, null will be returned as reference
	 */
	public static function getReference($packageName)
	{
		foreach (self::getInstalled() as $installed) {
			if (!isset($installed['versions'][$packageName])) {
				continue;
			}

			if (!isset($installed['versions'][$packageName]['reference'])) {
				return null;
			}

			return $installed['versions'][$packageName]['reference'];
		}

		throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
	}

	/**
	 * @param  string      $packageName
	 * @return string|null If the package is being replaced or provided but is not really installed, null will be returned as install path. Packages of type metapackages also have a null install path.
	 */
	public static function getInstallPath($packageName)
	{
		foreach (self::getInstalled() as $installed) {
			if (!isset($installed['versions'][$packageName])) {
				continue;
			}

			return isset($installed['versions'][$packageName]['install_path']) ? $installed['versions'][$packageName]['install_path'] : null;
		}

		throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
	}

	/**
	 * @return array
	 * @psalm-return array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}
	 */
	public static function getRootPackage()
	{
		$installed = self::getInstalled();

		return $installed[0]['root'];
	}

	/**
	 * Returns the raw installed.php data for custom implementations
	 *
	 * @deprecated Use getAllRawData() instead which returns all datasets for all autoloaders present in the process. getRawData only returns the first dataset loaded, which may not be what you expect.
	 * @return array[]
	 * @psalm-return array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>}
	 */
	public static function getRawData()
	{
		@trigger_error('getRawData only returns the first dataset loaded, which may not be what you expect. Use getAllRawData() instead which returns all datasets for all autoloaders present in the process.', E_USER_DEPRECATED);

		if (null === self::$installed) {
			// only require the installed.php file if this file is loaded from its dumped location,
			// and not from its source location in the composer/composer package, see https://github.com/composer/composer/issues/9937
			if (substr(__DIR__, -8, 1) !== 'C') {
				self::$installed = include __DIR__ . '/installed.php';
			} else {
				self::$installed = array();
			}
		}

		return self::$installed;
	}

	/**
	 * Returns the raw data of all installed.php which are currently loaded for custom implementations
	 *
	 * @return array[]
	 * @psalm-return list<array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>}>
	 */
	public static function getAllRawData()
	{
		return self::getInstalled();
	}

	/**
	 * Lets you reload the static array from another file
	 *
	 * This is only useful for complex integrations in which a project needs to use
	 * this class but then also needs to execute another project's autoloader in process,
	 * and wants to ensure both projects have access to their version of installed.php.
	 *
	 * A typical case would be PHPUnit, where it would need to make sure it reads all
	 * the data it needs from this class, then call reload() with
	 * `require $CWD/vendor/composer/installed.php` (or similar) as input to make sure
	 * the project in which it runs can then also use this class safely, without
	 * interference between PHPUnit's dependencies and the project's dependencies.
	 *
	 * @param  array[] $data A vendor/composer/installed.php data set
	 * @return void
	 *
	 * @psalm-param array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>} $data
	 */
	public static function reload($data)
	{
		self::$installed = $data;
		self::$installedByVendor = array();
	}

	/**
	 * @return array[]
	 * @psalm-return list<array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>}>
	 */
	private static function getInstalled()
	{
		if (null === self::$canGetVendors) {
			self::$canGetVendors = method_exists('Composer\Autoload\ClassLoader', 'getRegisteredLoaders');
		}

		$installed = array();

		if (self::$canGetVendors) {
			foreach (ClassLoader::getRegisteredLoaders() as $vendorDir => $loader) {
				if (isset(self::$installedByVendor[$vendorDir])) {
					$installed[] = self::$installedByVendor[$vendorDir];
				} elseif (is_file($vendorDir.'/composer/installed.php')) {
					/** @var array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>} $required */
					$required = require $vendorDir.'/composer/installed.php';
					$installed[] = self::$installedByVendor[$vendorDir] = $required;
					if (null === self::$installed && strtr($vendorDir.'/composer', '\\', '/') === strtr(__DIR__, '\\', '/')) {
						self::$installed = $installed[count($installed) - 1];
					}
				}
			}
		}

		if (null === self::$installed) {
			// only require the installed.php file if this file is loaded from its dumped location,
			// and not from its source location in the composer/composer package, see https://github.com/composer/composer/issues/9937
			if (substr(__DIR__, -8, 1) !== 'C') {
				/** @var array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>} $required */
				$required = require __DIR__ . '/installed.php';
				self::$installed = $required;
			} else {
				self::$installed = array();
			}
		}

		if (self::$installed !== array()) {
			$installed[] = self::$installed;
		}

		return $installed;
	}
}