Iri::remove_dot_segments( string $input ): string

Source

protected function remove_dot_segments($input) {
	$output = '';
	while (strpos($input, './') !== false || strpos($input, '/.') !== false || $input === '.' || $input === '..') {
		// A: If the input buffer begins with a prefix of "../" or "./",
		// then remove that prefix from the input buffer; otherwise,
		if (strpos($input, '../') === 0) {
			$input = substr($input, 3);
		}
		elseif (strpos($input, './') === 0) {
			$input = substr($input, 2);
		}
		// 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,
		elseif (strpos($input, '/./') === 0) {
			$input = substr($input, 2);
		}
		elseif ($input === '/.') {
			$input = '/';
		}
		// C: if the input buffer begins with a prefix of "/../" or "/..",
		// where ".." is a complete path segment, then replace that prefix
		// with "/" in the input buffer and remove the last segment and its
		// preceding "/" (if any) from the output buffer; otherwise,
		elseif (strpos($input, '/../') === 0) {
			$input = substr($input, 3);
			$output = substr_replace($output, '', (strrpos($output, '/') ?: 0));
		}
		elseif ($input === '/..') {
			$input = '/';
			$output = substr_replace($output, '', (strrpos($output, '/') ?: 0));
		}
		// D: if the input buffer consists only of "." or "..", then remove
		// that from the input buffer; otherwise,
		elseif ($input === '.' || $input === '..') {
			$input = '';
		}
		// E: move the first path segment in the input buffer to the end of
		// the output buffer, including the initial "/" character (if any)
		// and any subsequent characters up to, but not including, the next
		// "/" character or the end of the input buffer
		elseif (($pos = strpos($input, '/', 1)) !== false) {
			$output .= substr($input, 0, $pos);
			$input = substr_replace($input, '', 0, $pos);
		}
		else {
			$output .= $input;
			$input = '';
		}
	}
	return $output . $input;
}

View all references View on Trac View on GitHub