parentOf method
String parentOf(Removes the final path component of a path, using the platform's path separator to split the path. Will not remove the root component of a Windows path, like "C:\" or "\\server_name\". Ignores trailing path separators, and leaves no trailing path separators.
Source
static String parentOf(String path) { int rootEnd = -1; if (Platform.isWindows) { if (path.startsWith(_absoluteWindowsPathPattern)) { // Root ends at first / or \ after the first two characters. rootEnd = path.indexOf(new RegExp(r'[/\\]'), 2); if (rootEnd == -1) return path; } else if (path.startsWith('\\') || path.startsWith('/')) { rootEnd = 0; } } else if (path.startsWith('/')) { rootEnd = 0; } // Ignore trailing slashes. // All non-trivial cases have separators between two non-separators. int pos = path.lastIndexOf(_parentRegExp); if (pos > rootEnd) { return path.substring(0, pos + 1); } else if (rootEnd > -1) { return path.substring(0, rootEnd + 1); } else { return '.'; } }
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https://api.dartlang.org/stable/1.24.3/dart-io/FileSystemEntity/parentOf.html