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Intervals.php
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Intervals.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;
use Composer\Semver\Constraint\Constraint;
use Composer\Semver\Constraint\ConstraintInterface;
use Composer\Semver\Constraint\MatchAllConstraint;
use Composer\Semver\Constraint\MatchNoneConstraint;
use Composer\Semver\Constraint\MultiConstraint;
/**
* Helper class generating intervals from constraints
*
* This contains utilities for:
*
* - compacting an existing constraint which can be used to combine several into one
* by creating a MultiConstraint out of the many constraints you have.
*
* - checking whether one subset is a subset of another.
*
* Note: You should call clear to free memoization memory usage when you are done using this class
*/
class Intervals
{
/**
* @phpstan-var array<string, array{'numeric': Interval[], 'branches': array{'names': string[], 'exclude': bool}}>
*/
private static $intervalsCache = array();
/**
* @phpstan-var array<string, int>
*/
private static $opSortOrder = array(
'>=' => -3,
'<' => -2,
'>' => 2,
'<=' => 3,
);
/**
* Clears the memoization cache once you are done
*
* @return void
*/
public static function clear()
{
self::$intervalsCache = array();
}
/**
* Checks whether $candidate is a subset of $constraint
*
* @return bool
*/
public static function isSubsetOf(ConstraintInterface $candidate, ConstraintInterface $constraint)
{
if ($constraint instanceof MatchAllConstraint) {
return true;
}
if ($candidate instanceof MatchNoneConstraint || $constraint instanceof MatchNoneConstraint) {
return false;
}
$intersectionIntervals = self::get(new MultiConstraint(array($candidate, $constraint), true));
$candidateIntervals = self::get($candidate);
if (\count($intersectionIntervals['numeric']) !== \count($candidateIntervals['numeric'])) {
return false;
}
foreach ($intersectionIntervals['numeric'] as $index => $interval) {
if (!isset($candidateIntervals['numeric'][$index])) {
return false;
}
if ((string) $candidateIntervals['numeric'][$index]->getStart() !== (string) $interval->getStart()) {
return false;
}
if ((string) $candidateIntervals['numeric'][$index]->getEnd() !== (string) $interval->getEnd()) {
return false;
}
}
if ($intersectionIntervals['branches']['exclude'] !== $candidateIntervals['branches']['exclude']) {
return false;
}
if (\count($intersectionIntervals['branches']['names']) !== \count($candidateIntervals['branches']['names'])) {
return false;
}
foreach ($intersectionIntervals['branches']['names'] as $index => $name) {
if ($name !== $candidateIntervals['branches']['names'][$index]) {
return false;
}
}
return true;
}
/**
* Checks whether $a and $b have any intersection, equivalent to $a->matches($b)
*
* @return bool
*/
public static function haveIntersections(ConstraintInterface $a, ConstraintInterface $b)
{
if ($a instanceof MatchAllConstraint || $b instanceof MatchAllConstraint) {
return true;
}
if ($a instanceof MatchNoneConstraint || $b instanceof MatchNoneConstraint) {
return false;
}
$intersectionIntervals = self::generateIntervals(new MultiConstraint(array($a, $b), true), true);
return \count($intersectionIntervals['numeric']) > 0 || $intersectionIntervals['branches']['exclude'] || \count($intersectionIntervals['branches']['names']) > 0;
}
/**
* Attempts to optimize a MultiConstraint
*
* When merging MultiConstraints together they can get very large, this will
* compact it by looking at the real intervals covered by all the constraints
* and then creates a new constraint containing only the smallest amount of rules
* to match the same intervals.
*
* @return ConstraintInterface
*/
public static function compactConstraint(ConstraintInterface $constraint)
{
if (!$constraint instanceof MultiConstraint) {
return $constraint;
}
$intervals = self::generateIntervals($constraint);
$constraints = array();
$hasNumericMatchAll = false;
if (\count($intervals['numeric']) === 1 && (string) $intervals['numeric'][0]->getStart() === (string) Interval::fromZero() && (string) $intervals['numeric'][0]->getEnd() === (string) Interval::untilPositiveInfinity()) {
$constraints[] = $intervals['numeric'][0]->getStart();
$hasNumericMatchAll = true;
} else {
$unEqualConstraints = array();
for ($i = 0, $count = \count($intervals['numeric']); $i < $count; $i++) {
$interval = $intervals['numeric'][$i];
// if current interval ends with < N and next interval begins with > N we can swap this out for != N
// but this needs to happen as a conjunctive expression together with the start of the current interval
// and end of next interval, so [>=M, <N] || [>N, <P] => [>=M, !=N, <P] but M/P can be skipped if
// they are zero/+inf
if ($interval->getEnd()->getOperator() === '<' && $i+1 < $count) {
$nextInterval = $intervals['numeric'][$i+1];
if ($interval->getEnd()->getVersion() === $nextInterval->getStart()->getVersion() && $nextInterval->getStart()->getOperator() === '>') {
// only add a start if we didn't already do so, can be skipped if we're looking at second
// interval in [>=M, <N] || [>N, <P] || [>P, <Q] where unEqualConstraints currently contains
// [>=M, !=N] already and we only want to add !=P right now
if (\count($unEqualConstraints) === 0 && (string) $interval->getStart() !== (string) Interval::fromZero()) {
$unEqualConstraints[] = $interval->getStart();
}
$unEqualConstraints[] = new Constraint('!=', $interval->getEnd()->getVersion());
continue;
}
}
if (\count($unEqualConstraints) > 0) {
// this is where the end of the following interval of a != constraint is added as explained above
if ((string) $interval->getEnd() !== (string) Interval::untilPositiveInfinity()) {
$unEqualConstraints[] = $interval->getEnd();
}
// count is 1 if entire constraint is just one != expression
if (\count($unEqualConstraints) > 1) {
$constraints[] = new MultiConstraint($unEqualConstraints, true);
} else {
$constraints[] = $unEqualConstraints[0];
}
$unEqualConstraints = array();
continue;
}
// convert back >= x - <= x intervals to == x
if ($interval->getStart()->getVersion() === $interval->getEnd()->getVersion() && $interval->getStart()->getOperator() === '>=' && $interval->getEnd()->getOperator() === '<=') {
$constraints[] = new Constraint('==', $interval->getStart()->getVersion());
continue;
}
if ((string) $interval->getStart() === (string) Interval::fromZero()) {
$constraints[] = $interval->getEnd();
} elseif ((string) $interval->getEnd() === (string) Interval::untilPositiveInfinity()) {
$constraints[] = $interval->getStart();
} else {
$constraints[] = new MultiConstraint(array($interval->getStart(), $interval->getEnd()), true);
}
}
}
$devConstraints = array();
if (0 === \count($intervals['branches']['names'])) {
if ($intervals['branches']['exclude']) {
if ($hasNumericMatchAll) {
return new MatchAllConstraint;
}
// otherwise constraint should contain a != operator and already cover this
}
} else {
foreach ($intervals['branches']['names'] as $branchName) {
if ($intervals['branches']['exclude']) {
$devConstraints[] = new Constraint('!=', $branchName);
} else {
$devConstraints[] = new Constraint('==', $branchName);
}
}
// excluded branches, e.g. != dev-foo are conjunctive with the interval, so
// > 2.0 != dev-foo must return a conjunctive constraint
if ($intervals['branches']['exclude']) {
if (\count($constraints) > 1) {
return new MultiConstraint(array_merge(
array(new MultiConstraint($constraints, false)),
$devConstraints
), true);
}
if (\count($constraints) === 1 && (string)$constraints[0] === (string)Interval::fromZero()) {
if (\count($devConstraints) > 1) {
return new MultiConstraint($devConstraints, true);
}
return $devConstraints[0];
}
return new MultiConstraint(array_merge($constraints, $devConstraints), true);
}
// otherwise devConstraints contains a list of == operators for branches which are disjunctive with the
// rest of the constraint
$constraints = array_merge($constraints, $devConstraints);
}
if (\count($constraints) > 1) {
return new MultiConstraint($constraints, false);
}
if (\count($constraints) === 1) {
return $constraints[0];
}
return new MatchNoneConstraint;
}
/**
* Creates an array of numeric intervals and branch constraints representing a given constraint
*
* if the returned numeric array is empty it means the constraint matches nothing in the numeric range (0 - +inf)
* if the returned branches array is empty it means no dev-* versions are matched
* if a constraint matches all possible dev-* versions, branches will contain Interval::anyDev()
*
* @return array
* @phpstan-return array{'numeric': Interval[], 'branches': array{'names': string[], 'exclude': bool}}
*/
public static function get(ConstraintInterface $constraint)
{
$key = (string) $constraint;
if (!isset(self::$intervalsCache[$key])) {
self::$intervalsCache[$key] = self::generateIntervals($constraint);
}
return self::$intervalsCache[$key];
}
/**
* @param bool $stopOnFirstValidInterval
*
* @phpstan-return array{'numeric': Interval[], 'branches': array{'names': string[], 'exclude': bool}}
*/
private static function generateIntervals(ConstraintInterface $constraint, $stopOnFirstValidInterval = false)
{
if ($constraint instanceof MatchAllConstraint) {
return array('numeric' => array(new Interval(Interval::fromZero(), Interval::untilPositiveInfinity())), 'branches' => Interval::anyDev());
}
if ($constraint instanceof MatchNoneConstraint) {
return array('numeric' => array(), 'branches' => array('names' => array(), 'exclude' => false));
}
if ($constraint instanceof Constraint) {
return self::generateSingleConstraintIntervals($constraint);
}
if (!$constraint instanceof MultiConstraint) {
throw new \UnexpectedValueException('The constraint passed in should be an MatchAllConstraint, Constraint or MultiConstraint instance, got '.\get_class($constraint).'.');
}
$constraints = $constraint->getConstraints();
$numericGroups = array();
$constraintBranches = array();
foreach ($constraints as $c) {
$res = self::get($c);
$numericGroups[] = $res['numeric'];
$constraintBranches[] = $res['branches'];
}
if ($constraint->isDisjunctive()) {
$branches = Interval::noDev();
foreach ($constraintBranches as $b) {
if ($b['exclude']) {
if ($branches['exclude']) {
// disjunctive constraint, so only exclude what's excluded in all constraints
// !=a,!=b || !=b,!=c => !=b
$branches['names'] = array_intersect($branches['names'], $b['names']);
} else {
// disjunctive constraint so exclude all names which are not explicitly included in the alternative
// (==b || ==c) || !=a,!=b => !=a
$branches['exclude'] = true;
$branches['names'] = array_diff($b['names'], $branches['names']);
}
} else {
if ($branches['exclude']) {
// disjunctive constraint so exclude all names which are not explicitly included in the alternative
// !=a,!=b || (==b || ==c) => !=a
$branches['names'] = array_diff($branches['names'], $b['names']);
} else {
// disjunctive constraint, so just add all the other branches
// (==a || ==b) || ==c => ==a || ==b || ==c
$branches['names'] = array_merge($branches['names'], $b['names']);
}
}
}
} else {
$branches = Interval::anyDev();
foreach ($constraintBranches as $b) {
if ($b['exclude']) {
if ($branches['exclude']) {
// conjunctive, so just add all branch names to be excluded
// !=a && !=b => !=a,!=b
$branches['names'] = array_merge($branches['names'], $b['names']);
} else {
// conjunctive, so only keep included names which are not excluded
// (==a||==c) && !=a,!=b => ==c
$branches['names'] = array_diff($branches['names'], $b['names']);
}
} else {
if ($branches['exclude']) {
// conjunctive, so only keep included names which are not excluded
// !=a,!=b && (==a||==c) => ==c
$branches['names'] = array_diff($b['names'], $branches['names']);
$branches['exclude'] = false;
} else {
// conjunctive, so only keep names that are included in both
// (==a||==b) && (==a||==c) => ==a
$branches['names'] = array_intersect($branches['names'], $b['names']);
}
}
}
}
$branches['names'] = array_unique($branches['names']);
if (\count($numericGroups) === 1) {
return array('numeric' => $numericGroups[0], 'branches' => $branches);
}
$borders = array();
foreach ($numericGroups as $group) {
foreach ($group as $interval) {
$borders[] = array('version' => $interval->getStart()->getVersion(), 'operator' => $interval->getStart()->getOperator(), 'side' => 'start');
$borders[] = array('version' => $interval->getEnd()->getVersion(), 'operator' => $interval->getEnd()->getOperator(), 'side' => 'end');
}
}
$opSortOrder = self::$opSortOrder;
usort($borders, function ($a, $b) use ($opSortOrder) {
$order = version_compare($a['version'], $b['version']);
if ($order === 0) {
return $opSortOrder[$a['operator']] - $opSortOrder[$b['operator']];
}
return $order;
});
$activeIntervals = 0;
$intervals = array();
$index = 0;
$activationThreshold = $constraint->isConjunctive() ? \count($numericGroups) : 1;
$start = null;
foreach ($borders as $border) {
if ($border['side'] === 'start') {
$activeIntervals++;
} else {
$activeIntervals--;
}
if (!$start && $activeIntervals >= $activationThreshold) {
$start = new Constraint($border['operator'], $border['version']);
} elseif ($start && $activeIntervals < $activationThreshold) {
// filter out invalid intervals like > x - <= x, or >= x - < x
if (
version_compare($start->getVersion(), $border['version'], '=')
&& (
($start->getOperator() === '>' && $border['operator'] === '<=')
|| ($start->getOperator() === '>=' && $border['operator'] === '<')
)
) {
unset($intervals[$index]);
} else {
$intervals[$index] = new Interval($start, new Constraint($border['operator'], $border['version']));
$index++;
if ($stopOnFirstValidInterval) {
break;
}
}
$start = null;
}
}
return array('numeric' => $intervals, 'branches' => $branches);
}
/**
* @phpstan-return array{'numeric': Interval[], 'branches': array{'names': string[], 'exclude': bool}}
*/
private static function generateSingleConstraintIntervals(Constraint $constraint)
{
$op = $constraint->getOperator();
// handle branch constraints first
if (strpos($constraint->getVersion(), 'dev-') === 0) {
$intervals = array();
$branches = array('names' => array(), 'exclude' => false);
// != dev-foo means any numeric version may match, we treat >/< like != they are not really defined for branches
if ($op === '!=') {
$intervals[] = new Interval(Interval::fromZero(), Interval::untilPositiveInfinity());
$branches = array('names' => array($constraint->getVersion()), 'exclude' => true);
} elseif ($op === '==') {
$branches['names'][] = $constraint->getVersion();
}
return array(
'numeric' => $intervals,
'branches' => $branches,
);
}
if ($op[0] === '>') { // > & >=
return array('numeric' => array(new Interval($constraint, Interval::untilPositiveInfinity())), 'branches' => Interval::noDev());
}
if ($op[0] === '<') { // < & <=
return array('numeric' => array(new Interval(Interval::fromZero(), $constraint)), 'branches' => Interval::noDev());
}
if ($op === '!=') {
// convert !=x to intervals of 0 - <x && >x - +inf + dev*
return array('numeric' => array(
new Interval(Interval::fromZero(), new Constraint('<', $constraint->getVersion())),
new Interval(new Constraint('>', $constraint->getVersion()), Interval::untilPositiveInfinity()),
), 'branches' => Interval::anyDev());
}
// convert ==x to an interval of >=x - <=x
return array('numeric' => array(
new Interval(new Constraint('>=', $constraint->getVersion()), new Constraint('<=', $constraint->getVersion())),
), 'branches' => Interval::noDev());
}
}

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