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MultiConstraint.php
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MultiConstraint.php
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<?php
/*
* This file is part of composer/semver.
*
* (c) Composer <https://github.com/composer>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace Composer\Semver\Constraint;
/**
* Defines a conjunctive or disjunctive set of constraints.
*/
class MultiConstraint implements ConstraintInterface
{
/**
* @var ConstraintInterface[]
* @phpstan-var non-empty-array<ConstraintInterface>
*/
protected $constraints;
/** @var string|null */
protected $prettyString;
/** @var string|null */
protected $string;
/** @var bool */
protected $conjunctive;
/** @var Bound|null */
protected $lowerBound;
/** @var Bound|null */
protected $upperBound;
/**
* @param ConstraintInterface[] $constraints A set of constraints
* @param bool $conjunctive Whether the constraints should be treated as conjunctive or disjunctive
*
* @throws \InvalidArgumentException If less than 2 constraints are passed
*/
public function __construct(array $constraints, $conjunctive = true)
{
if (\count($constraints) < 2) {
throw new \InvalidArgumentException(
'Must provide at least two constraints for a MultiConstraint. Use '.
'the regular Constraint class for one constraint only or MatchAllConstraint for none. You may use '.
'MultiConstraint::create() which optimizes and handles those cases automatically.'
);
}
$this->constraints = $constraints;
$this->conjunctive = $conjunctive;
}
/**
* @return ConstraintInterface[]
*/
public function getConstraints()
{
return $this->constraints;
}
/**
* @return bool
*/
public function isConjunctive()
{
return $this->conjunctive;
}
/**
* @return bool
*/
public function isDisjunctive()
{
return !$this->conjunctive;
}
/**
* {@inheritDoc}
*/
public function compile($otherOperator)
{
$parts = array();
foreach ($this->constraints as $constraint) {
$code = $constraint->compile($otherOperator);
if ($code === 'true') {
if (!$this->conjunctive) {
return 'true';
}
} elseif ($code === 'false') {
if ($this->conjunctive) {
return 'false';
}
} else {
$parts[] = '('.$code.')';
}
}
if (!$parts) {
return $this->conjunctive ? 'true' : 'false';
}
return $this->conjunctive ? implode('&&', $parts) : implode('||', $parts);
}
/**
* @param ConstraintInterface $provider
*
* @return bool
*/
public function matches(ConstraintInterface $provider)
{
if (false === $this->conjunctive) {
foreach ($this->constraints as $constraint) {
if ($provider->matches($constraint)) {
return true;
}
}
return false;
}
// when matching a conjunctive and a disjunctive multi constraint we have to iterate over the disjunctive one
// otherwise we'd return true if different parts of the disjunctive constraint match the conjunctive one
// which would lead to incorrect results, e.g. [>1 and <2] would match [<1 or >2] although they do not intersect
if ($provider instanceof MultiConstraint && $provider->isDisjunctive()) {
return $provider->matches($this);
}
foreach ($this->constraints as $constraint) {
if (!$provider->matches($constraint)) {
return false;
}
}
return true;
}
/**
* {@inheritDoc}
*/
public function setPrettyString($prettyString)
{
$this->prettyString = $prettyString;
}
/**
* {@inheritDoc}
*/
public function getPrettyString()
{
if ($this->prettyString) {
return $this->prettyString;
}
return (string) $this;
}
/**
* {@inheritDoc}
*/
public function __toString()
{
if ($this->string !== null) {
return $this->string;
}
$constraints = array();
foreach ($this->constraints as $constraint) {
$constraints[] = (string) $constraint;
}
return $this->string = '[' . implode($this->conjunctive ? ' ' : ' || ', $constraints) . ']';
}
/**
* {@inheritDoc}
*/
public function getLowerBound()
{
$this->extractBounds();
if (null === $this->lowerBound) {
throw new \LogicException('extractBounds should have populated the lowerBound property');
}
return $this->lowerBound;
}
/**
* {@inheritDoc}
*/
public function getUpperBound()
{
$this->extractBounds();
if (null === $this->upperBound) {
throw new \LogicException('extractBounds should have populated the upperBound property');
}
return $this->upperBound;
}
/**
* Tries to optimize the constraints as much as possible, meaning
* reducing/collapsing congruent constraints etc.
* Does not necessarily return a MultiConstraint instance if
* things can be reduced to a simple constraint
*
* @param ConstraintInterface[] $constraints A set of constraints
* @param bool $conjunctive Whether the constraints should be treated as conjunctive or disjunctive
*
* @return ConstraintInterface
*/
public static function create(array $constraints, $conjunctive = true)
{
if (0 === \count($constraints)) {
return new MatchAllConstraint();
}
if (1 === \count($constraints)) {
return $constraints[0];
}
$optimized = self::optimizeConstraints($constraints, $conjunctive);
if ($optimized !== null) {
list($constraints, $conjunctive) = $optimized;
if (\count($constraints) === 1) {
return $constraints[0];
}
}
return new self($constraints, $conjunctive);
}
/**
* @param ConstraintInterface[] $constraints
* @param bool $conjunctive
* @return ?array
*
* @phpstan-return array{0: list<ConstraintInterface>, 1: bool}|null
*/
private static function optimizeConstraints(array $constraints, $conjunctive)
{
// parse the two OR groups and if they are contiguous we collapse
// them into one constraint
// [>= 1 < 2] || [>= 2 < 3] || [>= 3 < 4] => [>= 1 < 4]
if (!$conjunctive) {
$left = $constraints[0];
$mergedConstraints = array();
$optimized = false;
for ($i = 1, $l = \count($constraints); $i < $l; $i++) {
$right = $constraints[$i];
if (
$left instanceof self
&& $left->conjunctive
&& $right instanceof self
&& $right->conjunctive
&& \count($left->constraints) === 2
&& \count($right->constraints) === 2
&& ($left0 = (string) $left->constraints[0])
&& $left0[0] === '>' && $left0[1] === '='
&& ($left1 = (string) $left->constraints[1])
&& $left1[0] === '<'
&& ($right0 = (string) $right->constraints[0])
&& $right0[0] === '>' && $right0[1] === '='
&& ($right1 = (string) $right->constraints[1])
&& $right1[0] === '<'
&& substr($left1, 2) === substr($right0, 3)
) {
$optimized = true;
$left = new MultiConstraint(
array(
$left->constraints[0],
$right->constraints[1],
),
true);
} else {
$mergedConstraints[] = $left;
$left = $right;
}
}
if ($optimized) {
$mergedConstraints[] = $left;
return array($mergedConstraints, false);
}
}
// TODO: Here's the place to put more optimizations
return null;
}
/**
* @return void
*/
private function extractBounds()
{
if (null !== $this->lowerBound) {
return;
}
foreach ($this->constraints as $constraint) {
if (null === $this->lowerBound || null === $this->upperBound) {
$this->lowerBound = $constraint->getLowerBound();
$this->upperBound = $constraint->getUpperBound();
continue;
}
if ($constraint->getLowerBound()->compareTo($this->lowerBound, $this->isConjunctive() ? '>' : '<')) {
$this->lowerBound = $constraint->getLowerBound();
}
if ($constraint->getUpperBound()->compareTo($this->upperBound, $this->isConjunctive() ? '<' : '>')) {
$this->upperBound = $constraint->getUpperBound();
}
}
}
}

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text/x-php
Expires
Sat, May 16, 21:25 (1 d, 13 h)
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MultiConstraint.php (9 KB)

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