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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\Package\Version;
use Composer\Package\BasePackage;
use Composer\Package\AliasPackage;
use Composer\Package\PackageInterface;
use Composer\Composer;
use Composer\Package\Loader\ArrayLoader;
use Composer\Package\Dumper\ArrayDumper;
use Composer\Repository\RepositorySet;
use Composer\Repository\PlatformRepository;
use Composer\Semver\Constraint\Constraint;
/**
* Selects the best possible version for a package
*
* @author Ryan Weaver <ryan@knpuniversity.com>
* @author Jordi Boggiano <j.boggiano@seld.be>
*/
class VersionSelector
{
private $repositorySet;
private $platformConstraints = array();
private $parser;
/**
* @param PlatformRepository $platformRepo If passed in, the versions found will be filtered against their requirements to eliminate any not matching the current platform packages
*/
public function __construct(RepositorySet $repositorySet, PlatformRepository $platformRepo = null)
{
$this->repositorySet = $repositorySet;
if ($platformRepo) {
foreach ($platformRepo->getPackages() as $package) {
$this->platformConstraints[$package->getName()][] = new Constraint('==', $package->getVersion());
}
}
}
/**
* Given a package name and optional version, returns the latest PackageInterface
* that matches.
*
* @param string $packageName
* @param string $targetPackageVersion
* @param string $preferredStability
* @param bool|array $ignorePlatformReqs
* @return PackageInterface|false
*/
public function findBestCandidate($packageName, $targetPackageVersion = null, $preferredStability = 'stable', $ignorePlatformReqs = false, $repoSetFlags = 0)
{
if (!isset(BasePackage::$stabilities[$preferredStability])) {
// If you get this, maybe you are still relying on the Composer 1.x signature where the 3rd arg was the php version
throw new \UnexpectedValueException('Expected a valid stability name as 3rd argument, got '.$preferredStability);
}
$constraint = $targetPackageVersion ? $this->getParser()->parseConstraints($targetPackageVersion) : null;
$candidates = $this->repositorySet->findPackages(strtolower($packageName), $constraint, $repoSetFlags);
if ($this->platformConstraints && true !== $ignorePlatformReqs) {
$platformConstraints = $this->platformConstraints;
$ignorePlatformReqs = $ignorePlatformReqs ?: array();
$candidates = array_filter($candidates, function ($pkg) use ($platformConstraints, $ignorePlatformReqs) {
$reqs = $pkg->getRequires();
foreach ($reqs as $name => $link) {
if (!in_array($name, $ignorePlatformReqs, true) && isset($platformConstraints[$name])) {
foreach ($platformConstraints[$name] as $constraint) {
if ($link->getConstraint()->matches($constraint)) {
continue 2;
}
}
return false;
}
}
return true;
});
}
if (!$candidates) {
return false;
}
// select highest version if we have many
$package = reset($candidates);
$minPriority = BasePackage::$stabilities[$preferredStability];
foreach ($candidates as $candidate) {
$candidatePriority = $candidate->getStabilityPriority();
$currentPriority = $package->getStabilityPriority();
// candidate is less stable than our preferred stability,
// and current package is more stable than candidate, skip it
if ($minPriority < $candidatePriority && $currentPriority < $candidatePriority) {
continue;
}
// candidate is less stable than our preferred stability,
// and current package is less stable than candidate, select candidate
if ($minPriority < $candidatePriority && $candidatePriority < $currentPriority) {
$package = $candidate;
continue;
}
// candidate is more stable than our preferred stability,
// and current package is less stable than preferred stability, select candidate
if ($minPriority >= $candidatePriority && $minPriority < $currentPriority) {
$package = $candidate;
continue;
}
// select highest version of the two
if (version_compare($package->getVersion(), $candidate->getVersion(), '<')) {
$package = $candidate;
}
}
// if we end up with 9999999-dev as selected package, make sure we use the original version instead of the alias
if ($package instanceof AliasPackage && $package->getVersion() === VersionParser::DEFAULT_BRANCH_ALIAS) {
$package = $package->getAliasOf();
}
return $package;
}
/**
* Given a concrete version, this returns a ^ constraint (when possible)
* that should be used, for example, in composer.json.
*
* For example:
* * 1.2.1 -> ^1.2
* * 1.2 -> ^1.2
* * v3.2.1 -> ^3.2
* * 2.0-beta.1 -> ^2.0@beta
* * dev-master -> ^2.1@dev (dev version with alias)
* * dev-master -> dev-master (dev versions are untouched)
*
* @param PackageInterface $package
* @return string
*/
public function findRecommendedRequireVersion(PackageInterface $package)
{
// Extensions which are versioned in sync with PHP should rather be required as "*" to simplify
// the requires and have only one required version to change when bumping the php requirement
if (0 === strpos($package->getName(), 'ext-')) {
$phpVersion = PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION . '.' . PHP_RELEASE_VERSION;
$extVersion = implode('.', array_slice(explode('.', $package->getVersion()), 0, 3));
if ($phpVersion === $extVersion) {
return '*';
}
}
$version = $package->getVersion();
if (!$package->isDev()) {
return $this->transformVersion($version, $package->getPrettyVersion(), $package->getStability());
}
$loader = new ArrayLoader($this->getParser());
$dumper = new ArrayDumper();
$extra = $loader->getBranchAlias($dumper->dump($package));
if ($extra && $extra !== VersionParser::DEFAULT_BRANCH_ALIAS) {
$extra = preg_replace('{^(\d+\.\d+\.\d+)(\.9999999)-dev$}', '$1.0', $extra, -1, $count);
if ($count) {
$extra = str_replace('.9999999', '.0', $extra);
return $this->transformVersion($extra, $extra, 'dev');
}
}
return $package->getPrettyVersion();
}
private function transformVersion($version, $prettyVersion, $stability)
{
// attempt to transform 2.1.1 to 2.1
// this allows you to upgrade through minor versions
$semanticVersionParts = explode('.', $version);
// check to see if we have a semver-looking version
if (count($semanticVersionParts) == 4 && preg_match('{^0\D?}', $semanticVersionParts[3])) {
// remove the last parts (i.e. the patch version number and any extra)
if ($semanticVersionParts[0] === '0') {
unset($semanticVersionParts[3]);
} else {
unset($semanticVersionParts[2], $semanticVersionParts[3]);
}
$version = implode('.', $semanticVersionParts);
} else {
return $prettyVersion;
}
// append stability flag if not default
if ($stability != 'stable') {
$version .= '@'.$stability;
}
// 2.1 -> ^2.1
return '^' . $version;
}
private function getParser()
{
if ($this->parser === null) {
$this->parser = new VersionParser();
}
return $this->parser;
}
}