Composer\Semver\VersionParser::parseConstraint()

Complexity

Conditions	70
Paths	1820

Size

Total Lines	218
Code Lines	111

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

<?php
    private function parseConstraint($constraint)
    {
        // strip off aliasing
        if (preg_match('{^([^,\s]++) ++as ++([^,\s]++)$}', $constraint, $match)) {
            $constraint = $match[1];
        }

        // strip @stability flags, and keep it for later use
        if (preg_match('{^([^,\s]*?)@(' . self::$stabilitiesRegex . ')$}i', $constraint, $match)) {
            $constraint = '' !== $match[1] ? $match[1] : '*';
            if ($match[2] !== 'stable') {
                $stabilityModifier = $match[2];
            }
        }

        // get rid of #refs as those are used by composer only
        if (preg_match('{^(dev-[^,\s@]+?|[^,\s@]+?\.x-dev)#.+$}i', $constraint, $match)) {
            $constraint = $match[1];
        }

        if (preg_match('{^(v)?[xX*](\.[xX*])*$}i', $constraint, $match)) {
            if (!empty($match[1]) || !empty($match[2])) {
                return array(new Constraint('>=', '0.0.0.0-dev'));
            }

            return array(new MatchAllConstraint());
        }

        $versionRegex = 'v?(\d++)(?:\.(\d++))?(?:\.(\d++))?(?:\.(\d++))?(?:' . self::$modifierRegex . '|\.([xX*][.-]?dev))(?:\+[^\s]+)?';

        // Tilde Range
        //
        // Like wildcard constraints, unsuffixed tilde constraints say that they must be greater than the previous
        // version, to ensure that unstable instances of the current version are allowed. However, if a stability
        // suffix is added to the constraint, then a >= match on the current version is used instead.
        if (preg_match('{^~>?' . $versionRegex . '$}i', $constraint, $matches)) {
            if (strpos($constraint, '~>') === 0) {
                throw new \UnexpectedValueException(
                    'Could not parse version constraint ' . $constraint . ': ' .
                    'Invalid operator "~>", you probably meant to use the "~" operator'
                );
            }

            // Work out which position in the version we are operating at
            if (isset($matches[4]) && '' !== $matches[4] && null !== $matches[4]) {
                $position = 4;
            } elseif (isset($matches[3]) && '' !== $matches[3] && null !== $matches[3]) {
                $position = 3;
            } elseif (isset($matches[2]) && '' !== $matches[2] && null !== $matches[2]) {
                $position = 2;
            } else {
                $position = 1;
            }

            // when matching 2.x-dev or 3.0.x-dev we have to shift the second or third number, despite no second/third number matching above
            if (!empty($matches[8])) {
                $position++;
            }

            // Calculate the stability suffix
            $stabilitySuffix = '';
            if (empty($matches[5]) && empty($matches[7]) && empty($matches[8])) {
                $stabilitySuffix .= '-dev';
            }

            $lowVersion = $this->normalize(substr($constraint . $stabilitySuffix, 1));
            $lowerBound = new Constraint('>=', $lowVersion);

            // For upper bound, we increment the position of one more significance,
            // but highPosition = 0 would be illegal
            $highPosition = max(1, $position - 1);
            $highVersion = $this->manipulateVersionString($matches, $highPosition, 1) . '-dev';
            $upperBound = new Constraint('<', $highVersion);

            return array(
                $lowerBound,
                $upperBound,
            );
        }

        // Caret Range
        //
        // Allows changes that do not modify the left-most non-zero digit in the [major, minor, patch] tuple.
        // In other words, this allows patch and minor updates for versions 1.0.0 and above, patch updates for
        // versions 0.X >=0.1.0, and no updates for versions 0.0.X
        if (preg_match('{^\^' . $versionRegex . '($)}i', $constraint, $matches)) {
            // Work out which position in the version we are operating at
            if ('0' !== $matches[1] || '' === $matches[2] || null === $matches[2]) {
                $position = 1;
            } elseif ('0' !== $matches[2] || '' === $matches[3] || null === $matches[3]) {
                $position = 2;
            } else {
                $position = 3;
            }

            // Calculate the stability suffix
            $stabilitySuffix = '';
            if (empty($matches[5]) && empty($matches[7]) && empty($matches[8])) {
                $stabilitySuffix .= '-dev';
            }

            $lowVersion = $this->normalize(substr($constraint . $stabilitySuffix, 1));
            $lowerBound = new Constraint('>=', $lowVersion);

            // For upper bound, we increment the position of one more significance,
            // but highPosition = 0 would be illegal
            $highVersion = $this->manipulateVersionString($matches, $position, 1) . '-dev';
            $upperBound = new Constraint('<', $highVersion);

            return array(
                $lowerBound,
                $upperBound,
            );
        }

        // X Range
        //
        // Any of X, x, or * may be used to "stand in" for one of the numeric values in the [major, minor, patch] tuple.
        // A partial version range is treated as an X-Range, so the special character is in fact optional.
        if (preg_match('{^v?(\d++)(?:\.(\d++))?(?:\.(\d++))?(?:\.[xX*])++$}', $constraint, $matches)) {
            if (isset($matches[3]) && '' !== $matches[3] && null !== $matches[3]) {
                $position = 3;
            } elseif (isset($matches[2]) && '' !== $matches[2] && null !== $matches[2]) {
                $position = 2;
            } else {
                $position = 1;
            }

            $lowVersion = $this->manipulateVersionString($matches, $position) . '-dev';
            $highVersion = $this->manipulateVersionString($matches, $position, 1) . '-dev';

            if ($lowVersion === '0.0.0.0-dev') {
                return array(new Constraint('<', $highVersion));
            }

            return array(
                new Constraint('>=', $lowVersion),
                new Constraint('<', $highVersion),
            );
        }

        // Hyphen Range
        //
        // Specifies an inclusive set. If a partial version is provided as the first version in the inclusive range,
        // then the missing pieces are replaced with zeroes. If a partial version is provided as the second version in
        // the inclusive range, then all versions that start with the supplied parts of the tuple are accepted, but
        // nothing that would be greater than the provided tuple parts.
        if (preg_match('{^(?P<from>' . $versionRegex . ') +- +(?P<to>' . $versionRegex . ')($)}i', $constraint, $matches)) {
            // Calculate the stability suffix
            $lowStabilitySuffix = '';
            if (empty($matches[6]) && empty($matches[8]) && empty($matches[9])) {
                $lowStabilitySuffix = '-dev';
            }

            $lowVersion = $this->normalize($matches['from']);
            $lowerBound = new Constraint('>=', $lowVersion . $lowStabilitySuffix);

            $empty = function ($x) {
                return ($x === 0 || $x === '0') ? false : empty($x);
            };

            if ((!$empty($matches[12]) && !$empty($matches[13])) || !empty($matches[15]) || !empty($matches[17]) || !empty($matches[18])) {
                $highVersion = $this->normalize($matches['to']);
                $upperBound = new Constraint('<=', $highVersion);
            } else {
                $highMatch = array('', $matches[11], $matches[12], $matches[13], $matches[14]);

                // validate to version
                $this->normalize($matches['to']);

                $highVersion = $this->manipulateVersionString($highMatch, $empty($matches[12]) ? 1 : 2, 1) . '-dev';
                $upperBound = new Constraint('<', $highVersion);
            }

            return array(
                $lowerBound,
                $upperBound,
            );
        }

        // Basic Comparators
        if (preg_match('{^(<>|!=|>=?|<=?|==?)?\s*(.*)}', $constraint, $matches)) {
            try {
                try {
                    $version = $this->normalize($matches[2]);
                } catch (\UnexpectedValueException $e) {
                    // recover from an invalid constraint like foobar-dev which should be dev-foobar
                    // except if the constraint uses a known operator, in which case it must be a parse error
                    if (substr($matches[2], -4) === '-dev' && preg_match('{^[0-9a-zA-Z-./]+$}', $matches[2])) {
                        $version = $this->normalize('dev-'.substr($matches[2], 0, -4));
                    } else {
                        throw $e;
                    }
                }

                $op = $matches[1] ?: '=';

                if ($op !== '==' && $op !== '=' && !empty($stabilityModifier) && self::parseStability($version) === 'stable') {
                    $version .= '-' . $stabilityModifier;
                } elseif ('<' === $op || '>=' === $op) {
                    if (!preg_match('/-' . self::$modifierRegex . '$/', strtolower($matches[2]))) {
                        if (strpos($matches[2], 'dev-') !== 0) {
                            $version .= '-dev';
                        }
                    }
                }

                return array(new Constraint($matches[1] ?: '=', $version));
            } catch (\Exception $e) {

Consider adding a comment why this CATCH block is empty.

            }
        }

        $message = 'Could not parse version constraint ' . $constraint;
        if (isset($e)) {
            $message .= ': ' . $e->getMessage();
        }

        throw new \UnexpectedValueException($message);
    }