pathWithoutExtension function

String pathWithoutExtension(String path)

Returns path with its trailing file extension (and the dot) removed.

A leading dot (dotfile like .gitignore) is not treated as an extension, so such paths are returned unchanged.

Example:

pathWithoutExtension('archive.tar.gz'); // 'archive.tar'
pathWithoutExtension('.gitignore'); // '.gitignore'

Audited: 2026-06-12 11:26 EDT

Implementation

String pathWithoutExtension(String path) {
  // Confine the extension dot to the final segment, like pathExtension: the old
  // whole-path search made pathWithoutExtension('/a.b/c') return '/a' by cutting
  // at the dot in the directory name 'a.b'.
  final int slash = path.lastIndexOf('/');
  final int backslash = path.lastIndexOf(r'\');
  final int sep = slash > backslash ? slash : backslash;
  final int dotIndex = path.lastIndexOf('.');
  if (dotIndex <= sep + 1) return path;
  return path.substring(0, dotIndex);
}