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<?php |
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/* this file is part of pipelines */ |
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namespace Ktomk\Pipelines; |
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/** |
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* Class LibFsPath - path utility functions |
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* |
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* @package Ktomk\Pipelines |
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*/ |
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class LibFsPath |
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{ |
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/** |
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* check if path is absolute |
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* |
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* @param string $path |
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* |
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* @return bool |
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*/ |
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public static function isAbsolute($path) |
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{ |
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// TODO: a variant with PHP stream wrapper prefix support |
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/* @see LibFsStream::isUri */ |
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$count = strspn($path, '/', 0, 3) % 2; |
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return (bool)$count; |
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} |
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/** |
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* check if path is basename |
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* |
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* @param string $path |
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* |
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* @return bool |
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*/ |
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public static function isBasename($path) |
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{ |
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if (in_array($path, array('', '.', '..'), true)) { |
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return false; |
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} |
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if (false !== strpos($path, '/')) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Resolve relative path segments in a path on it's own |
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* |
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* This is not realpath, not resolving any links. |
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* |
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* @param string $path |
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* |
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* @return string |
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*/ |
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public static function normalizeSegments($path) |
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{ |
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if ('' === $path) { |
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return $path; |
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} |
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$buffer = $path; |
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$prefix = ''; |
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$len = strspn($buffer, '/'); |
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if (0 < $len) { |
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$prefix = substr($buffer, 0, $len); |
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$buffer = substr($buffer, $len); |
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} |
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$buffer = rtrim($buffer, '/'); |
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if (in_array($buffer, array('', '.'), true)) { |
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return $prefix; |
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} |
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$pos = strpos($buffer, '/'); |
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if (false === $pos) { |
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return $prefix . $buffer; |
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} |
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$buffer = preg_replace('~/+~', '/', $buffer); |
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$segments = explode('/', $buffer); |
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$stack = array(); |
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foreach ($segments as $segment) { |
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$i = count($stack) - 1; |
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if ('.' === $segment) { |
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continue; |
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} |
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if ('..' !== $segment) { |
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$stack[] = $segment; |
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continue; |
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} |
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if (($i > -1) && '..' !== $stack[$i]) { |
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array_pop($stack); |
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continue; |
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} |
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$stack[] = $segment; |
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} |
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return $prefix . implode('/', $stack); |
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} |
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/** |
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* @param string $path |
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* |
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* @return bool |
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*/ |
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public static function containsRelativeSegment($path) |
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{ |
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$segments = array_flip(explode('/', $path)); |
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return isset($segments['.']) || isset($segments['..']); |
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} |
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/** |
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* Normalize a path as/if common in PHP |
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* |
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* E.g. w/ phar:// in front which means w/ stream wrappers in |
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* mind. |
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* |
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* @param string $path |
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* |
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* @return string |
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*/ |
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public static function normalize($path) |
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{ |
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$buffer = $path; |
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$scheme = ''; |
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// TODO support for all supported stream wrappers (w/ absolute/relative notation?) |
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/* @see LibFsStream::isUri */ |
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/* @see LibFsPath::isAbsolute */ |
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if (0 === strpos($buffer, 'phar://') || 0 === strpos($buffer, 'file://')) { |
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$scheme = substr($buffer, 0, 7); |
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$buffer = substr($buffer, 7); |
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} |
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5 |
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$normalized = self::normalizeSegments($buffer); |
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return $scheme . $normalized; |
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} |
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/** |
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* @param string $path |
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* |
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* @return bool |
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*/ |
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public static function isPortable($path) |
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{ |
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return 1 === Preg::match('(^(?>/?(?!-)[A-Za-z0-9._-]+)+$)D', $path); |
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} |
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/** |
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* @param string $path |
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* |
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* @return string |
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*/ |
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5 |
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public static function gateAbsolutePortable($path) |
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{ |
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if (!self::isAbsolute($path)) { |
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throw new \InvalidArgumentException(sprintf('not an absolute path: "%s"', $path)); |
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} |
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4 |
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$normalized = self::normalizeSegments($path); |
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if (self::containsRelativeSegment($normalized)) { |
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throw new \InvalidArgumentException(sprintf('not a fully qualified path: "%s"', $path)); |
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} |
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3 |
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if (!self::isPortable($path)) { |
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throw new \InvalidArgumentException(sprintf('not a portable path: "%s"', $path)); |
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} |
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2 |
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return $normalized; |
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} |
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} |
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ktomk /
pipelines
