Aerys\Root::removeDotPathSegments PHP Method

    public static function removeDotPathSegments(string $path) : string
    {
        if (strpos($path, '/.') === false) {
            return $path;
        }
        $inputBuffer = $path;
        $outputStack = [];
        /**
         * 2.  While the input buffer is not empty, loop as follows:
         */
        while ($inputBuffer != '') {
            /**
             * A.  If the input buffer begins with a prefix of "../" or "./",
             *     then remove that prefix from the input buffer; otherwise,
             */
            if (strpos($inputBuffer, "./") === 0) {
                $inputBuffer = substr($inputBuffer, 2);
                continue;
            }
            if (strpos($inputBuffer, "../") === 0) {
                $inputBuffer = substr($inputBuffer, 3);
                continue;
            }
            /**
             * B.  if the input buffer begins with a prefix of "/./" or "/.",
             *     where "." is a complete path segment, then replace that
             *     prefix with "/" in the input buffer; otherwise,
             */
            if ($inputBuffer === "/.") {
                $outputStack[] = '/';
                break;
            }
            if (substr($inputBuffer, 0, 3) === "/./") {
                $inputBuffer = substr($inputBuffer, 2);
                continue;
            }
            /**
             * C.  if the input buffer begins with a prefix of "/../" or "/..",
             *     where ".." is a complete path segment, then replace that
             *     prefix with "/" in the input buffer and remove the last
             *     segment and its preceding "/" (if any) from the output
             *     buffer; otherwise,
             */
            if ($inputBuffer === "/..") {
                array_pop($outputStack);
                $outputStack[] = '/';
                break;
            }
            if (substr($inputBuffer, 0, 4) === "/../") {
                while (array_pop($outputStack) === "/") {
                }
                $inputBuffer = substr($inputBuffer, 3);
                continue;
            }
            /**
             * D.  if the input buffer consists only of "." or "..", then remove
             *     that from the input buffer; otherwise,
             */
            if ($inputBuffer === '.' || $inputBuffer === '..') {
                break;
            }
            /**
             * E.  move the first path segment in the input buffer to the end of
             *     the output buffer, including the initial "/" character (if
             *     any) and any subsequent characters up to, but not including,
             *     the next "/" character or the end of the input buffer.
             */
            if (($slashPos = stripos($inputBuffer, '/', 1)) === false) {
                $outputStack[] = $inputBuffer;
                break;
            } else {
                $outputStack[] = substr($inputBuffer, 0, $slashPos);
                $inputBuffer = substr($inputBuffer, $slashPos);
            }
        }
        return implode($outputStack);
    }