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/** |
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* SemanticVersion Class |
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* |
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* @package phpfeature |
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* @author Alain Schlesser <[email protected]> |
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* @license GPL-2.0+ |
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* @link http://www.brightnucleus.com/ |
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* @copyright 2016 Alain Schlesser, Bright Nucleus |
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*/ |
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/** |
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* Class SemanticVersion |
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* |
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* @since 0.1.0 |
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* |
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* @author Alain Schlesser <[email protected]> |
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*/ |
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class SemanticVersion |
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{ |
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/** |
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* RegEx pattern that matches the different version components. |
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* |
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* @since 0.1.0 |
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* |
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* @var string |
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*/ |
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const VERSION_PATTERN = '/^(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:-([0-9A-Za-z-]*))?(?:\+([0-9A-Za-z-]*))?$/'; |
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/** |
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* Version that is used. |
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* |
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* @since 0.1.0 |
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* |
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* @var string |
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*/ |
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protected $version; |
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/** |
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* Different components of the version that is used. |
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* |
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* @since 0.1.0 |
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* |
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* @var array |
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*/ |
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protected $components; |
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/** |
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* Instantiate a Version object. |
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* |
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* @since 0.1.0 |
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* |
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* @param string|null $version Optional. The version to use. Defaults to |
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* the current PHP interpreter's version. |
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* @param bool $partial Optional. Whether to accept a partial |
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* version number. If true, the missing |
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* components will default to `0` instead of |
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* throwing an exception. |
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* @throws RuntimeException When the version fails to validate. |
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*/ |
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public function __construct($version = null, $partial = false) |
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{ |
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if ( ! $version) { |
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$version = '0.0.0'; |
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} |
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$version = $this->validate($version, $partial); |
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$this->version = $version; |
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} |
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/** |
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* Validate the version and assert it is in SemVer format. |
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* |
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* @since 0.1.0 |
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* |
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* @param string $version The version to validate. |
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* @param bool $partial Optional. Whether to accept a partial version |
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* number. If true, the missing components will |
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* default to `0` instead of throwing an exception. |
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* @return string |
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* @throws RuntimeException When the version fails to validate. |
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*/ |
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protected function validate($version, $partial = false) |
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{ |
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$version = trim($version); |
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$pattern = self::VERSION_PATTERN; |
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$components = array(); |
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$result = preg_match($pattern, $version, $components); |
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if ( ! $result) { |
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throw new RuntimeException(sprintf( |
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'Failed to validate version "%1$s".', |
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(string)$version |
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)); |
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} |
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if ( ! $partial && ( ! isset($components[2]) || ! isset($components[3]))) { |
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throw new RuntimeException(sprintf( |
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'Could not accept partial version "%1$s", requested full versions only.', |
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(string)$version |
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)); |
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} |
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$this->setComponent('major', isset($components[1]) ? (int)$components[1] : 0); |
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$this->setComponent('minor', isset($components[2]) ? (int)$components[2] : 0); |
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$this->setComponent('patch', isset($components[3]) ? (int)$components[3] : 0); |
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$this->setComponent('pre-release', isset($components[4]) ? (string)$components[4] : ''); |
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$this->setComponent('build', isset($components[5]) ? (string)$components[5] : ''); |
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$version = $this->getVersionFromComponents(); |
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return $version; |
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} |
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/** |
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* Get the version that is used. |
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* |
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* @since 0.1.0 |
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* |
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* @return string The version that is used. '0.0.0' if not defined. |
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*/ |
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public function getVersion() |
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{ |
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return (string)isset($this->version) ? $this->version : '0.0.0'; |
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} |
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/** |
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* Build and return a versin from the separated components. |
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* |
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* @since 0.1.0 |
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* |
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* @return string |
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*/ |
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protected function getVersionFromComponents() |
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{ |
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$pre_release = $this->getPreRelease() ? '-' . $this->getPreRelease() : ''; |
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$build = $this->getBuild() ? '+' . $this->getBuild() : ''; |
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$version = sprintf( |
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'%1$s.%2$s.%3$s%4$s%5$s', |
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$this->getMajor(), |
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$this->getMinor(), |
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$this->getPatch(), |
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$pre_release, |
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$build |
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); |
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return $version; |
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} |
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/** |
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* Get the major version number. |
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* |
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* @since 0.1.0 |
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* |
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* @return int The major version that is used. 0 if not defined. |
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*/ |
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public function getMajor() |
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{ |
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return (int)$this->getComponent('major') ?: 0; |
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} |
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/** |
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* Get the minor version number. |
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* |
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* @since 0.1.0 |
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* |
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* @return int The minor version that is used. 0 if not defined. |
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*/ |
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public function getMinor() |
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{ |
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return (int)$this->getComponent('minor') ?: 0; |
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} |
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/** |
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* Get the patch version number. |
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* |
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* @since 0.1.0 |
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* |
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* @return int The patch version that is used. 0 if not defined. |
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*/ |
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public function getPatch() |
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{ |
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return (int)$this->getComponent('patch') ?: 0; |
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} |
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/** |
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* Get the pre-release label. |
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* |
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* @since 0.1.0 |
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* |
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* @return int The patch version that is used. '' if not defined. |
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*/ |
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public function getPreRelease() |
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{ |
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return (string)$this->getComponent('pre-release') ?: ''; |
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} |
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/** |
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* Get the build metadata. |
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* |
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* @since 0.1.0 |
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* |
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* @return int The build metadata for the version that is used. '' if not |
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* defined. |
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*/ |
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public function getBuild() |
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{ |
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return (string)$this->getComponent('build') ?: ''; |
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} |
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/** |
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* Get a component of the version. |
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* |
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* @since 0.1.0 |
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* |
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* @param string $level What level of component to get. Possible values: |
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* 'major', 'minor', 'patch' |
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* @return int The requested version component. null if not defined. |
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*/ |
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protected function getComponent($level) |
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{ |
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return array_key_exists($level, $this->components) |
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? $this->components[$level] |
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: null; |
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} |
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/** |
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* Set a component of the version. |
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* |
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* @since 0.1.0 |
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* |
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* @param string $level What level of component to set. Possible values: |
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* 'major', 'minor', 'patch' |
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* @param int $version What version to set that component to. |
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*/ |
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protected function setComponent($level, $version) |
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{ |
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$this->components[$level] = $version; |
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} |
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/** |
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* Get a string representation of the object. |
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* |
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* @since 0.2.0 |
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* |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return (string)$this->getVersion(); |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: