def construct_id_from_path(subdir: str, name: str, type_suffix: str) -> str:
        """Construct target ID from subdir, name and type suffix.

        This helper function is made public mostly for tests."""
        # This ID must also be a valid file name on all OSs.
        # It should also avoid shell metacharacters for obvious
        # reasons. '@' is not used as often as '_' in source code names.
        # In case of collisions consider using checksums.
        # FIXME replace with assert when slash in names is prohibited
        name_part = name.replace('/', '@').replace('\\', '@')
        assert not has_path_sep(type_suffix)
        my_id = name_part + type_suffix
        if subdir:
            subdir_part = Target._get_id_hash(subdir)
            # preserve myid for better debuggability
            return subdir_part + '@@' + my_id
        return my_id
Construct target ID from subdir, name and type suffix.

        This helper function is made public mostly for tests.
mesonbuild/build.py