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Move handling of watch graph to separate classes

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Nils Adermann 2012-05-19 01:27:57 +02:00
parent 71ee5c8f4c
commit 731a451dfe
3 changed files with 242 additions and 120 deletions
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134
src/Composer/DependencyResolver/RuleWatchGraph.php Normal file
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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;
/**
* @author Nils Adermann <naderman@naderman.de>
*/
class RuleWatchGraph
{
protected $watches = array();
/**
* Alters watch chains for a rule.
*
* Next1/2 always points to the next rule that is watching the same package.
* The watches array contains rules to start from for each package
*
*/
public function insert(RuleWatchNode $node)
{
// skip simple assertions of the form (A) or (-A)
if ($node->getRule()->isAssertion()) {
return;
}
if (!isset($this->watches[$node->watch1])) {
$this->watches[$node->watch1] = null;
}
$node->next1 = $this->watches[$node->watch1];
$this->watches[$node->watch1] = $node;
if (!isset($this->watches[$node->watch2])) {
$this->watches[$node->watch2] = null;
}
$node->next2 = $this->watches[$node->watch2];
$this->watches[$node->watch2] = $node;
}
public function contains($literalId)
{
return isset($this->watches[$literalId]);
}
public function walkLiteral($literalId, $level, $skipCallback, $conflictCallback, $decideCallback)
{
if (!isset($this->watches[$literalId])) {
return;
}
$prevNode = null;
for ($node = $this->watches[$literalId]; $node !== null; $prevNode = $node, $node = $nextNode) {
$nextNode = $node->getNext($literalId);
if ($node->getRule()->isDisabled()) {
continue;
}
$otherWatch = $node->getOtherWatch($literalId);
if (call_user_func($skipCallback, $otherWatch)) {
continue;
}
$ruleLiterals = $node->getRule()->getLiterals();
if (sizeof($ruleLiterals) > 2) {
foreach ($ruleLiterals as $ruleLiteral) {
if ($otherWatch !== $ruleLiteral->getId() &&
!call_user_func($conflictCallback, $ruleLiteral->getId())) {
$node = $this->moveWatch($literalId, $ruleLiteral->getId(), $prevNode, $node, $nextNode);
continue 2;
}
}
}
// yay, we found a unit clause! try setting it to true
if (call_user_func($conflictCallback, $otherWatch)) {
return $node->getRule();
}
call_user_func($decideCallback, $otherWatch, $level, $node->getRule());
}
return null;
}
public function moveWatch($fromLiteral, $toLiteral, $prevNode, $node, $nextNode) {
if ($fromLiteral == $node->watch1) {
$node->watch1 = $toLiteral;
$node->next1 = (isset($this->watches[$toLiteral])) ? $this->watches[$toLiteral] : null;
} else {
$node->watch2 = $toLiteral;
$node->next2 = (isset($this->watches[$toLiteral])) ? $this->watches[$toLiteral] : null;
}
if ($prevNode) {
if ($prevNode->next1 === $node) {
$prevNode->next1 = $nextNode;
} else {
$prevNode->next2 = $nextNode;
}
} else {
$this->watches[$fromLiteral] = $nextNode;
}
$this->watches[$toLiteral] = $node;
if ($prevNode) {
return $prevNode;
}
$tmpNode = new RuleWatchNode(new Rule(array(), null, null));
$tmpNode->watch1 = $fromLiteral;
$tmpNode->next1 = $nextNode;
$tmpNode->watch2 = $fromLiteral;
$tmpNode->next2 = $nextNode;
return $tmpNode;
}
}