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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\DependencyResolver;
use Composer\Package\PackageInterface;
use Composer\Package\AliasPackage;
use Composer\Repository\PlatformRepository;
/**
* @author Nils Adermann <naderman@naderman.de>
*/
class RuleSetGenerator
{
protected $policy;
protected $pool;
protected $rules;
protected $addedMap;
protected $conflictAddedMap;
protected $addedPackagesByNames;
protected $conflictsForName;
public function __construct(PolicyInterface $policy, Pool $pool)
{
$this->policy = $policy;
$this->pool = $pool;
}
/**
* Creates a new rule for the requirements of a package
*
* This rule is of the form (-A|B|C), where B and C are the providers of
* one requirement of the package A.
*
* @param PackageInterface $package The package with a requirement
* @param array $providers The providers of the requirement
* @param int $reason A RULE_* constant describing the
* reason for generating this rule
* @param mixed $reasonData Any data, e.g. the requirement name,
* that goes with the reason
* @return Rule|null The generated rule or null if tautological
*/
protected function createRequireRule(PackageInterface $package, array $providers, $reason, $reasonData = null)
{
$literals = array(-$package->id);
foreach ($providers as $provider) {
// self fulfilling rule?
if ($provider === $package) {
return null;
}
$literals[] = $provider->id;
}
return new GenericRule($literals, $reason, $reasonData);
}
/**
* Creates a rule to install at least one of a set of packages
*
* The rule is (A|B|C) with A, B and C different packages. If the given
* set of packages is empty an impossible rule is generated.
*
* @param array $packages The set of packages to choose from
* @param int $reason A RULE_* constant describing the reason for
* generating this rule
* @param array $reasonData Additional data like the root require or fix request info
* @return Rule The generated rule
*/
protected function createInstallOneOfRule(array $packages, $reason, $reasonData)
{
$literals = array();
foreach ($packages as $package) {
$literals[] = $package->id;
}
return new GenericRule($literals, $reason, $reasonData);
}
/**
* Creates a rule for two conflicting packages
*
* The rule for conflicting packages A and B is (-A|-B). A is called the issuer
* and B the provider.
*
* @param PackageInterface $issuer The package declaring the conflict
* @param PackageInterface $provider The package causing the conflict
* @param int $reason A RULE_* constant describing the
* reason for generating this rule
* @param mixed $reasonData Any data, e.g. the package name, that
* goes with the reason
* @return Rule|null The generated rule
*/
protected function createRule2Literals(PackageInterface $issuer, PackageInterface $provider, $reason, $reasonData = null)
{
// ignore self conflict
if ($issuer === $provider) {
return null;
}
return new Rule2Literals(-$issuer->id, -$provider->id, $reason, $reasonData);
}
protected function createMultiConflictRule(array $packages, $reason, $reasonData = null)
{
$literals = array();
foreach ($packages as $package) {
$literals[] = -$package->id;
}
if (\count($literals) == 2) {
return new Rule2Literals($literals[0], $literals[1], $reason, $reasonData);
}
return new MultiConflictRule($literals, $reason, $reasonData);
}
/**
* Adds a rule unless it duplicates an existing one of any type
*
* To be able to directly pass in the result of one of the rule creation
* methods null is allowed which will not insert a rule.
*
* @param int $type A TYPE_* constant defining the rule type
* @param Rule $newRule The rule about to be added
*/
private function addRule($type, Rule $newRule = null)
{
if (!$newRule) {
return;
}
$this->rules->add($newRule, $type);
}
protected function addRulesForPackage(PackageInterface $package, $ignorePlatformReqs)
{
$workQueue = new \SplQueue;
$workQueue->enqueue($package);
while (!$workQueue->isEmpty()) {
/** @var PackageInterface $package */
$package = $workQueue->dequeue();
if (isset($this->addedMap[$package->id])) {
continue;
}
$this->addedMap[$package->id] = $package;
if (!$package instanceof AliasPackage) {
foreach ($package->getNames(false) as $name) {
$this->addedPackagesByNames[$name][] = $package;
}
} else {
$workQueue->enqueue($package->getAliasOf());
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRequireRule($package, array($package->getAliasOf()), Rule::RULE_PACKAGE_ALIAS, $package));
// aliases must be installed with their main package, so create a rule the other way around as well
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRequireRule($package->getAliasOf(), array($package), Rule::RULE_PACKAGE_INVERSE_ALIAS, $package->getAliasOf()));
// if alias package has no self.version requires, its requirements do not
// need to be added as the aliased package processing will take care of it
if (!$package->hasSelfVersionRequires()) {
continue;
}
}
foreach ($package->getRequires() as $link) {
if ((true === $ignorePlatformReqs || (is_array($ignorePlatformReqs) && in_array($link->getTarget(), $ignorePlatformReqs, true))) && PlatformRepository::isPlatformPackage($link->getTarget())) {
continue;
}
$possibleRequires = $this->pool->whatProvides($link->getTarget(), $link->getConstraint());
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRequireRule($package, $possibleRequires, Rule::RULE_PACKAGE_REQUIRES, $link));
foreach ($possibleRequires as $require) {
$workQueue->enqueue($require);
}
}
}
}
protected function addConflictRules($ignorePlatformReqs = false)
{
/** @var PackageInterface $package */
foreach ($this->addedMap as $package) {
foreach ($package->getConflicts() as $link) {
// even if conlict ends up being with an alias, there would be at least one actual package by this name
if (!isset($this->addedPackagesByNames[$link->getTarget()])) {
continue;
}
if ((true === $ignorePlatformReqs || (is_array($ignorePlatformReqs) && in_array($link->getTarget(), $ignorePlatformReqs, true))) && PlatformRepository::isPlatformPackage($link->getTarget())) {
continue;
}
$conflicts = $this->pool->whatProvides($link->getTarget(), $link->getConstraint());
foreach ($conflicts as $conflict) {
// define the conflict rule for regular packages, for alias packages it's only needed if the name
// matches the conflict exactly, otherwise the name match is by provide/replace which means the
// package which this is an alias of will conflict anyway, so no need to create additional rules
if (!$conflict instanceof AliasPackage || $conflict->getName() === $link->getTarget()) {
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRule2Literals($package, $conflict, Rule::RULE_PACKAGE_CONFLICT, $link));
}
}
}
}
foreach ($this->addedPackagesByNames as $name => $packages) {
if (\count($packages) > 1) {
$reason = Rule::RULE_PACKAGE_SAME_NAME;
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createMultiConflictRule($packages, $reason, $name));
}
}
}
protected function addRulesForRequest(Request $request, $ignorePlatformReqs)
{
foreach ($request->getFixedPackages() as $package) {
if ($package->id == -1) {
// fixed package was not added to the pool as it did not pass the stability requirements, this is fine
if ($this->pool->isUnacceptableFixedOrLockedPackage($package)) {
continue;
}
// otherwise, looks like a bug
throw new \LogicException("Fixed package ".$package->getPrettyString()." was not added to solver pool.");
}
$this->addRulesForPackage($package, $ignorePlatformReqs);
$rule = $this->createInstallOneOfRule(array($package), Rule::RULE_FIXED, array(
'package' => $package,
));
$this->addRule(RuleSet::TYPE_REQUEST, $rule);
}
foreach ($request->getRequires() as $packageName => $constraint) {
if ((true === $ignorePlatformReqs || (is_array($ignorePlatformReqs) && in_array($packageName, $ignorePlatformReqs, true))) && PlatformRepository::isPlatformPackage($packageName)) {
continue;
}
$packages = $this->pool->whatProvides($packageName, $constraint);
if ($packages) {
foreach ($packages as $package) {
$this->addRulesForPackage($package, $ignorePlatformReqs);
}
$rule = $this->createInstallOneOfRule($packages, Rule::RULE_ROOT_REQUIRE, array(
'packageName' => $packageName,
'constraint' => $constraint,
));
$this->addRule(RuleSet::TYPE_REQUEST, $rule);
}
}
}
protected function addRulesForRootAliases($ignorePlatformReqs)
{
foreach ($this->pool->getPackages() as $package) {
// ensure that rules for root alias packages and aliases of packages which were loaded are also loaded
// even if the alias itself isn't required, otherwise a package could be installed without its alias which
// leads to unexpected behavior
if (!isset($this->addedMap[$package->id]) &&
$package instanceof AliasPackage &&
($package->isRootPackageAlias() || isset($this->addedMap[$package->getAliasOf()->id]))
) {
$this->addRulesForPackage($package, $ignorePlatformReqs);
}
}
}
/**
* @param bool|array $ignorePlatformReqs
*/
public function getRulesFor(Request $request, $ignorePlatformReqs = false)
{
$this->rules = new RuleSet;
$this->addedMap = array();
$this->conflictAddedMap = array();
$this->addedPackagesByNames = array();
$this->conflictsForName = array();
$this->addRulesForRequest($request, $ignorePlatformReqs);
$this->addRulesForRootAliases($ignorePlatformReqs);
$this->addConflictRules($ignorePlatformReqs);
// Remove references to packages
$this->addedMap = $this->addedPackagesByNames = null;
return $this->rules;
}
}
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