def parse_lammps_dumps(file_pattern):
    """
    Generator that parses dump file(s).

    Args:
        file_pattern (str): Filename to parse. The timestep wildcard
            (e.g., dump.atom.'*') is supported and the files are parsed
            in the sequence of timestep.

    Yields:
        LammpsDump for each available snapshot.

    """
    files = glob.glob(file_pattern)
    if len(files) > 1:
        pattern = r"%s" % file_pattern.replace("*", "([0-9]+)")
        pattern = pattern.replace("\\", "\\\\")
        files = sorted(files,
                       key=lambda f: int(re.match(pattern, f).group(1)))

    for fname in files:
        with zopen(fname, "rt") as f:
            dump_cache = []
            for line in f:
                if line.startswith("ITEM: TIMESTEP"):
                    if len(dump_cache) > 0:
                        yield LammpsDump.from_string("".join(dump_cache))
                    dump_cache = [line]
                else:
                    dump_cache.append(line)
            yield LammpsDump.from_string("".join(dump_cache))