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<?php
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/*
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* This file is part of Composer.
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*
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* (c) Nils Adermann <naderman@naderman.de>
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* Jordi Boggiano <j.boggiano@seld.be>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Composer\DependencyResolver;
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use Composer\Repository\RepositoryInterface;
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use Composer\Package\PackageInterface;
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use Composer\Package\LinkConstraint\VersionConstraint;
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/**
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* @author Nils Adermann <naderman@naderman.de>
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*/
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class DefaultPolicy implements PolicyInterface
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{
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public function allowUninstall()
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{
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return false;
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}
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public function allowDowngrade()
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{
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return false;
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}
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public function versionCompare(PackageInterface $a, PackageInterface $b, $operator)
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{
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$constraint = new VersionConstraint($operator, $b->getVersion());
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$version = new VersionConstraint('==', $a->getVersion());
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return $constraint->matchSpecific($version);
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}
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public function findUpdatePackages(Solver $solver, Pool $pool, RepositoryInterface $repo, PackageInterface $package, $allowAll = false)
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{
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$packages = array();
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foreach ($pool->whatProvides($package->getName()) as $candidate) {
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// skip old packages unless downgrades are an option
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if (!$allowAll && !$this->allowDowngrade() && $this->versionCompare($package, $candidate, '>')) {
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continue;
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}
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if ($candidate !== $package) {
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$packages[] = $candidate;
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}
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}
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return $packages;
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}
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public function installable(Solver $solver, Pool $pool, RepositoryInterface $repo, PackageInterface $package)
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{
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// todo: package blacklist?
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return true;
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}
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public function selectPreferedPackages(Pool $pool, RepositoryInterface $installed, array $literals)
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{
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$packages = $this->groupLiteralsByNamePreferInstalled($installed, $literals);
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foreach ($packages as &$literals) {
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$policy = $this;
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usort($literals, function ($a, $b) use ($policy, $pool, $installed) {
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return $policy->compareByPriorityPreferInstalled($pool, $installed, $a->getPackage(), $b->getPackage());
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});
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}
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foreach ($packages as &$literals) {
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$literals = $this->pruneToBestVersion($literals);
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$literals = $this->pruneToHighestPriorityOrInstalled($pool, $installed, $literals);
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}
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$selected = call_user_func_array('array_merge', $packages);
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return $selected;
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}
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protected function groupLiteralsByNamePreferInstalled(RepositoryInterface $installed, $literals)
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{
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$packages = array();
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foreach ($literals as $literal) {
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$packageName = $literal->getPackage()->getName();
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if (!isset($packages[$packageName])) {
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$packages[$packageName] = array();
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}
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if ($literal->getPackage()->getRepository() === $installed) {
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array_unshift($packages[$packageName], $literal);
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} else {
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$packages[$packageName][] = $literal;
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}
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}
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return $packages;
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}
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public function compareByPriorityPreferInstalled(Pool $pool, RepositoryInterface $installed, PackageInterface $a, PackageInterface $b)
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{
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if ($a->getRepository() === $b->getRepository()) {
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return 0;
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}
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if ($a->getRepository() === $installed) {
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return -1;
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}
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if ($b->getRepository() === $installed) {
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return 1;
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}
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return ($pool->getPriority($a->getRepository()) > $pool->getPriority($b->getRepository())) ? -1 : 1;
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}
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protected function pruneToBestVersion($literals)
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{
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$bestLiterals = array($literals[0]);
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$bestPackage = $literals[0]->getPackage();
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foreach ($literals as $i => $literal) {
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if (0 === $i) {
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continue;
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}
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if ($this->versionCompare($literal->getPackage(), $bestPackage, '>')) {
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$bestPackage = $literal->getPackage();
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$bestLiterals = array($literal);
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} else if ($this->versionCompare($literal->getPackage(), $bestPackage, '==')) {
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$bestLiterals[] = $literal;
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}
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}
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return $bestLiterals;
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}
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protected function selectNewestPackages(RepositoryInterface $installed, array $literals)
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{
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$maxLiterals = array($literals[0]);
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$maxPackage = $literals[0]->getPackage();
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foreach ($literals as $i => $literal) {
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if (0 === $i) {
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continue;
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}
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if ($this->versionCompare($literal->getPackage(), $maxPackage, '>')) {
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$maxPackage = $literal->getPackage();
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$maxLiterals = array($literal);
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} else if ($this->versionCompare($literal->getPackage(), $maxPackage, '==')) {
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$maxLiterals[] = $literal;
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}
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}
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return $maxLiterals;
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}
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protected function pruneToHighestPriorityOrInstalled(Pool $pool, RepositoryInterface $installed, array $literals)
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{
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$selected = array();
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$priority = null;
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foreach ($literals as $literal) {
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$repo = $literal->getPackage()->getRepository();
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if ($repo === $installed) {
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$selected[] = $literal;
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continue;
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}
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if (null === $priority) {
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$priority = $pool->getPriority($repo);
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}
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if ($pool->getPriority($repo) != $priority) {
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break;
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}
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$selected[] = $literal;
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}
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return $selected;
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}
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}
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