Fix get_data_patterns for directories with the word data twice (#6309)

* Test get_data_patterns from directory with the word data twice

* Fix get_data_patterns

* Use glob_pattern_to_regex in entire xjoin

* Fix test by passing base_path as posix

* Use slash instead of xjoin for data files patterns

* Fix slash sep

src/datasets/data_files.py

@@ -227,7 +227,9 @@ def _is_unrequested_hidden_file_or_is_inside_unrequested_hidden_dir(matched_rel_
     return len(hidden_directories_in_path) != len(hidden_directories_in_pattern)
 
 
-def _get_data_files_patterns(pattern_resolver: Callable[[str], List[str]]) -> Dict[str, List[str]]:
+def _get_data_files_patterns(
+    pattern_resolver: Callable[[str], List[str]], base_path: str = ""
+) -> Dict[str, List[str]]:
     """
     Get the default pattern from a directory or repository by testing all the supported patterns.
     The first patterns to return a non-empty list of data files is returned.
@@ -242,7 +244,8 @@ def _get_data_files_patterns(pattern_resolver: Callable[[str], List[str]]) -> Di
         except FileNotFoundError:
             continue
         if len(data_files) > 0:
-            splits: Set[str] = {string_to_dict(p, glob_pattern_to_regex(split_pattern))["split"] for p in data_files}
+            pattern = base_path + ("/" if base_path else "") + split_pattern
+            splits: Set[str] = {string_to_dict(p, glob_pattern_to_regex(pattern))["split"] for p in data_files}
             sorted_splits = [str(split) for split in DEFAULT_SPLITS if split in splits] + sorted(
                 splits - set(DEFAULT_SPLITS)
             )
@@ -462,7 +465,7 @@ def get_data_patterns(base_path: str, download_config: Optional[DownloadConfig]
     """
     resolver = partial(resolve_pattern, base_path=base_path, download_config=download_config)
     try:
-        return _get_data_files_patterns(resolver)
+        return _get_data_files_patterns(resolver, base_path=base_path)
     except FileNotFoundError:
         raise EmptyDatasetError(f"The directory at {base_path} doesn't contain any data files") from None
 

tests/test_data_files.py

@@ -16,6 +16,7 @@
     _get_metadata_files_patterns,
     _is_inside_unrequested_special_dir,
     _is_unrequested_hidden_file_or_is_inside_unrequested_hidden_dir,
+    get_data_patterns,
     resolve_pattern,
 )
 from datasets.fingerprint import Hasher
@@ -634,3 +635,13 @@ def resolver(pattern):
     patterns = _get_metadata_files_patterns(resolver)
     matched = [file_path for pattern in patterns for file_path in resolver(pattern)]
     assert sorted(matched) == sorted(metadata_files)
+
+
+def test_get_data_patterns_from_directory_with_the_word_data_twice(tmp_path):
+    repo_dir = tmp_path / "directory-name-ending-with-the-word-data"  # parent directory contains the word "data/"
+    data_dir = repo_dir / "data"
+    data_dir.mkdir(parents=True)
+    data_file = data_dir / "train-00001-of-00009.parquet"
+    data_file.touch()
+    data_file_patterns = get_data_patterns(repo_dir.as_posix())
+    assert data_file_patterns == {"train": ["data/train-[0-9][0-9][0-9][0-9][0-9]-of-[0-9][0-9][0-9][0-9][0-9]*.*"]}