function MultiConstraint::optimizeConstraints

@phpstan-return array{0: list<ConstraintInterface>, 1: bool}|null

Parameters

ConstraintInterface[] $constraints:

bool $conjunctive:

Return value

?array

1 call to MultiConstraint::optimizeConstraints()

MultiConstraint::create in vendor/composer/semver/src/Constraint/MultiConstraint.php

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

File

vendor/composer/semver/src/Constraint/MultiConstraint.php, line 249

Class

MultiConstraint

Defines a conjunctive or disjunctive set of constraints.

Namespace

Composer\Semver\Constraint

Code

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;
}