class VersionConstraintParser

class VersionConstraintParser {
    
    /**
     * @throws UnsupportedVersionConstraintException
     */
    public function parse(string $value) : VersionConstraint {
        if (\strpos($value, '|') !== false) {
            return $this->handleOrGroup($value);
        }
        if (!\preg_match('/^[\\^~*]?v?[\\d.*]+(?:-.*)?$/i', $value)) {
            throw new UnsupportedVersionConstraintException(\sprintf('Version constraint %s is not supported.', $value));
        }
        switch ($value[0]) {
            case '~':
                return $this->handleTildeOperator($value);
            case '^':
                return $this->handleCaretOperator($value);
        }
        $constraint = new VersionConstraintValue($value);
        if ($constraint->getMajor()
            ->isAny()) {
            return new AnyVersionConstraint();
        }
        if ($constraint->getMinor()
            ->isAny()) {
            return new SpecificMajorVersionConstraint($constraint->getVersionString(), $constraint->getMajor()
                ->getValue() ?? 0);
        }
        if ($constraint->getPatch()
            ->isAny()) {
            return new SpecificMajorAndMinorVersionConstraint($constraint->getVersionString(), $constraint->getMajor()
                ->getValue() ?? 0, $constraint->getMinor()
                ->getValue() ?? 0);
        }
        return new ExactVersionConstraint($constraint->getVersionString());
    }
    private function handleOrGroup(string $value) : OrVersionConstraintGroup {
        $constraints = [];
        foreach (\preg_split('{\\s*\\|\\|?\\s*}', \trim($value)) as $groupSegment) {
            $constraints[] = $this->parse(\trim($groupSegment));
        }
        return new OrVersionConstraintGroup($value, $constraints);
    }
    private function handleTildeOperator(string $value) : AndVersionConstraintGroup {
        $constraintValue = new VersionConstraintValue(\substr($value, 1));
        if ($constraintValue->getPatch()
            ->isAny()) {
            return $this->handleCaretOperator($value);
        }
        $constraints = [
            new GreaterThanOrEqualToVersionConstraint($value, new Version(\substr($value, 1))),
            new SpecificMajorAndMinorVersionConstraint($value, $constraintValue->getMajor()
                ->getValue() ?? 0, $constraintValue->getMinor()
                ->getValue() ?? 0),
        ];
        return new AndVersionConstraintGroup($value, $constraints);
    }
    private function handleCaretOperator(string $value) : AndVersionConstraintGroup {
        $constraintValue = new VersionConstraintValue(\substr($value, 1));
        $constraints = [
            new GreaterThanOrEqualToVersionConstraint($value, new Version(\substr($value, 1))),
        ];
        if ($constraintValue->getMajor()
            ->getValue() === 0) {
            $constraints[] = new SpecificMajorAndMinorVersionConstraint($value, $constraintValue->getMajor()
                ->getValue() ?? 0, $constraintValue->getMinor()
                ->getValue() ?? 0);
        }
        else {
            $constraints[] = new SpecificMajorVersionConstraint($value, $constraintValue->getMajor()
                ->getValue() ?? 0);
        }
        return new AndVersionConstraintGroup($value, $constraints);
    }

}