rfctr(part): extract partition.common submodules (#3649)

**Summary**
In preparation for consolidating post-partitioning metadata decorators,
extract `partition.common` module into a sub-package (directory) and
extract `partition.common.metadata` module to house metadata-specific
object shared by partitioners.

**Additional Context**
- This new module will be the home of the new consolidated metadata
decorator.
- The consolidated decorator is a step toward removing post-processing
decorators from _delegating_ partitioners. A delegating partitioner is
one that convert its file to a different format and "delegates" actual
partitioning to the partitioner for that target format. 10 of the 20
partitioners are delegating partitioners.
- Removing decorators from delegating partitioners will allow us to
avoid "double-decorating", i.e. running those decorators twice, once on
the principal partitioner and again on the proxy partitioner.
- This will allow us to send `**kwargs` to either partitioner, removing
the knowledge of which arguments to send for each file-type from
auto-partition.
- And this will allow pluggable auto-partitioners which all have a
`partition_x(filename, *, file, **kwargs) -> list[Element]` interface.

CHANGELOG.md

@@ -1,5 +1,17 @@
+## 0.15.14-dev0
+
+### Enhancements
+
+### Features
+
+### Fixes
+
 ## 0.15.13
 
+### BREAKING CHANGES
+
+* **Remove dead experimental code.** Unused code in `file_utils.experimantal` and `file_utils.metadata` was removed. These functions were never published in the documentation, but if a client dug these out and used them this removal could break client code.
+
 ### Enhancements
 
 * **Improve `pdfminer` image cleanup process**. Optimized the removal of duplicated pdfminer images by performing the cleanup before merging elements, rather than after. This improvement reduces execution time and enhances overall processing speed of PDF documents.

scripts/chroma-test-helpers/create-and-check-chroma.sh

@@ -3,13 +3,4 @@
 set -e
 
 # $1 is the path for chroma to write the contents to. The symbol "&" runs process in background
-echo "Current venv is:"
-echo "$VIRTUAL_ENV"
-echo "Current path is:"
-echo "$PATH"
-ls -l "$VIRTUAL_ENV/bin/chroma"
-echo "================"
-cat "$VIRTUAL_ENV/bin/chroma"
-echo "================"
-# chroma run --path "$1" &
 python "$VIRTUAL_ENV/bin/chroma" run --path "$1" &

test_unstructured/partition/common/test_common.py

@@ -1,6 +1,3 @@
-import datetime as dt
-import io
-import os
 import pathlib
 from dataclasses import dataclass
 from multiprocessing import Pool
@@ -20,7 +17,6 @@ from unstructured.documents.elements import (
     TYPE_TO_TEXT_ELEMENT_MAP,
     CheckBox,
     CoordinatesMetadata,
-    ElementMetadata,
     ElementType,
     FigureCaption,
     Header,
@@ -32,7 +28,7 @@ from unstructured.documents.elements import (
 from unstructured.documents.elements import (
     Image as ImageElement,
 )
-from unstructured.partition import common
+from unstructured.partition.common import common
 from unstructured.partition.utils.constants import SORT_MODE_BASIC, SORT_MODE_DONT, SORT_MODE_XY_CUT
 
 
@@ -347,7 +343,7 @@ class MockRunOutput:
 
 
 def test_convert_office_doc_captures_errors(monkeypatch, caplog):
-    from unstructured.partition.common import subprocess
+    from unstructured.partition.common.common import subprocess
 
     def mock_run(*args, **kwargs):
         return MockRunOutput(1, "an error occurred".encode(), "error details".encode())
@@ -429,75 +425,6 @@ def test_get_page_image_metadata_and_coordinate_system():
     assert isinstance(metadata, dict)
 
 
-def test_set_element_hierarchy():
-    elements_to_set = [
-        Title(text="Title"),  # 0
-        NarrativeText(text="NarrativeText"),  # 1
-        FigureCaption(text="FigureCaption"),  # 2
-        ListItem(text="ListItem"),  # 3
-        ListItem(text="ListItem", metadata=ElementMetadata(category_depth=1)),  # 4
-        ListItem(text="ListItem", metadata=ElementMetadata(category_depth=1)),  # 5
-        ListItem(text="ListItem"),  # 6
-        CheckBox(element_id="some-id-1", checked=True),  # 7
-        Title(text="Title 2"),  # 8
-        ListItem(text="ListItem"),  # 9
-        ListItem(text="ListItem"),  # 10
-        Text(text="Text"),  # 11
-    ]
-    elements = common.set_element_hierarchy(elements_to_set)
-
-    assert (
-        elements[1].metadata.parent_id == elements[0].id
-    ), "NarrativeText should be child of Title"
-    assert (
-        elements[2].metadata.parent_id == elements[0].id
-    ), "FigureCaption should be child of Title"
-    assert elements[3].metadata.parent_id == elements[0].id, "ListItem should be child of Title"
-    assert elements[4].metadata.parent_id == elements[3].id, "ListItem should be child of Title"
-    assert elements[5].metadata.parent_id == elements[3].id, "ListItem should be child of Title"
-    assert elements[6].metadata.parent_id == elements[0].id, "ListItem should be child of Title"
-    # NOTE(Hubert): moving the category field to Element, caused this to fail.
-    # Checkboxes will soon be deprecated, then we can remove the test.
-    # assert (
-    #         elements[7].metadata.parent_id is None
-    # ), "CheckBox should be None, as it's not a Text based element"
-    assert elements[8].metadata.parent_id is None, "Title 2 should be child of None"
-    assert elements[9].metadata.parent_id == elements[8].id, "ListItem should be child of Title 2"
-    assert elements[10].metadata.parent_id == elements[8].id, "ListItem should be child of Title 2"
-    assert elements[11].metadata.parent_id == elements[8].id, "Text should be child of Title 2"
-
-
-def test_set_element_hierarchy_custom_rule_set():
-    elements_to_set = [
-        Header(text="Header"),  # 0
-        Title(text="Title"),  # 1
-        NarrativeText(text="NarrativeText"),  # 2
-        Text(text="Text"),  # 3
-        Title(text="Title 2"),  # 4
-        FigureCaption(text="FigureCaption"),  # 5
-    ]
-
-    custom_rule_set = {
-        "Header": ["Title", "Text"],
-        "Title": ["NarrativeText", "UncategorizedText", "FigureCaption"],
-    }
-
-    elements = common.set_element_hierarchy(
-        elements=elements_to_set,
-        ruleset=custom_rule_set,
-    )
-
-    assert elements[1].metadata.parent_id == elements[0].id, "Title should be child of Header"
-    assert (
-        elements[2].metadata.parent_id == elements[1].id
-    ), "NarrativeText should be child of Title"
-    assert elements[3].metadata.parent_id == elements[1].id, "Text should be child of Title"
-    assert elements[4].metadata.parent_id == elements[0].id, "Title 2 should be child of Header"
-    assert (
-        elements[5].metadata.parent_id == elements[4].id
-    ), "FigureCaption should be child of Title 2"
-
-
 @dataclass
 class MockImage:
     width = 640
@@ -607,99 +534,3 @@ def test_ocr_data_to_elements(
             points=layout_el.bbox.coordinates,
             system=coordinate_system,
         )
-
-
-class Describe_get_last_modified:
-    """Isolated unit-tests for `unstructured.partition.common.get_last_modified()."""
-
-    def it_pulls_last_modified_from_the_filesystem_when_a_path_is_provided(
-        self, file_and_last_modified: tuple[str, str]
-    ):
-        file_path, last_modified = file_and_last_modified
-        last_modified_date = common.get_last_modified(str(file_path), None, False)
-        assert last_modified_date == last_modified
-
-    def and_it_pulls_last_modified_from_the_file_like_object_when_one_is_provided(
-        self, file_and_last_modified: tuple[str, str]
-    ):
-        file_path, last_modified = file_and_last_modified
-        with open(file_path, "rb") as f:
-            last_modified_date = common.get_last_modified(None, f, True)
-        assert last_modified_date == last_modified
-
-    def but_not_when_date_from_file_object_is_False(self, file_and_last_modified: tuple[str, str]):
-        file_path, _ = file_and_last_modified
-        with open(file_path, "rb") as f:
-            last_modified_date = common.get_last_modified(None, f, False)
-        assert last_modified_date is None
-
-    # -- fixtures --------------------------------------------------------------------------------
-
-    @pytest.fixture()
-    def file_and_last_modified(self, tmp_path: pathlib.Path) -> tuple[str, str]:
-        modified_timestamp = dt.datetime(
-            year=2024, month=6, day=14, hour=15, minute=39, second=25
-        ).timestamp()
-        file_path = tmp_path / "some_file.txt"
-        file_path.write_text("abcdefg")
-        os.utime(file_path, (modified_timestamp, modified_timestamp))
-        return str(file_path), "2024-06-14T15:39:25"
-
-
-class Describe_get_last_modified_date:
-    def it_gets_the_modified_time_of_a_file_identified_by_a_path(self, tmp_path: pathlib.Path):
-        modified_timestamp = dt.datetime(
-            year=2024, month=3, day=5, hour=17, minute=43, second=40
-        ).timestamp()
-        file_path = tmp_path / "some_file.txt"
-        file_path.write_text("abcdefg")
-        os.utime(file_path, (modified_timestamp, modified_timestamp))
-
-        last_modified_date = common.get_last_modified_date(str(file_path))
-
-        assert last_modified_date == "2024-03-05T17:43:40"
-
-    def but_it_returns_None_when_there_is_no_file_at_that_path(self, tmp_path: pathlib.Path):
-        file_path = tmp_path / "some_file_that_does_not_exist.txt"
-
-        last_modified_date = common.get_last_modified_date(str(file_path))
-
-        assert last_modified_date is None
-
-
-class Describe_get_last_modified_date_from_file:
-    def it_gets_the_modified_time_of_a_file_like_object_corresponding_to_a_filesystem_file(
-        self, tmp_path: pathlib.Path
-    ):
-        modified_timestamp = dt.datetime(
-            year=2024, month=3, day=5, hour=20, minute=48, second=26
-        ).timestamp()
-        file_path = tmp_path / "some_file_2.txt"
-        file_path.write_text("abcdefg")
-        os.utime(file_path, (modified_timestamp, modified_timestamp))
-
-        with open(file_path, "rb") as f:
-            last_modified_date = common.get_last_modified_date_from_file(f)
-
-        assert last_modified_date == "2024-03-05T20:48:26"
-
-    def but_it_returns_None_when_the_argument_is_a_bytes_object(self):
-        assert common.get_last_modified_date_from_file(b"abcdefg") is None
-
-    def and_it_returns_None_when_the_file_like_object_has_no_name_attribute(self):
-        file = io.BytesIO(b"abcdefg")
-        assert hasattr(file, "name") is False
-
-        last_modified_date = common.get_last_modified_date_from_file(file)
-
-        assert last_modified_date is None
-
-    def and_it_returns_None_when_the_file_like_object_name_is_not_a_path_to_a_file(
-        self, tmp_path: pathlib.Path
-    ):
-        file = io.BytesIO(b"abcdefg")
-        file.name = str(tmp_path / "a_file_that_isn't_here.txt")
-
-        last_modified_date = common.get_last_modified_date_from_file(file)
-
-        assert last_modified_date is None

test_unstructured/partition/common/test_metadata.py

@@ -0,0 +1,201 @@
+"""Test-suite for `unstructured.partition.common.metadata` module."""
+
+from __future__ import annotations
+
+import datetime as dt
+import io
+import os
+import pathlib
+
+import pytest
+
+from unstructured.documents.elements import (
+    CheckBox,
+    ElementMetadata,
+    FigureCaption,
+    Header,
+    ListItem,
+    NarrativeText,
+    Text,
+    Title,
+)
+from unstructured.partition.common.metadata import (
+    get_last_modified,
+    get_last_modified_date,
+    get_last_modified_date_from_file,
+    set_element_hierarchy,
+)
+
+# ================================================================================================
+# LAST-MODIFIED
+# ================================================================================================
+
+
+class Describe_get_last_modified:
+    """Isolated unit-tests for `unstructured.partition.common.metadata.get_last_modified()."""
+
+    def it_pulls_last_modified_from_the_filesystem_when_a_path_is_provided(
+        self, file_and_last_modified: tuple[str, str]
+    ):
+        file_path, last_modified = file_and_last_modified
+        last_modified_date = get_last_modified(str(file_path), None, False)
+        assert last_modified_date == last_modified
+
+    def and_it_pulls_last_modified_from_the_file_like_object_when_one_is_provided(
+        self, file_and_last_modified: tuple[str, str]
+    ):
+        file_path, last_modified = file_and_last_modified
+        with open(file_path, "rb") as f:
+            last_modified_date = get_last_modified(None, f, True)
+        assert last_modified_date == last_modified
+
+    def but_not_when_date_from_file_object_is_False(self, file_and_last_modified: tuple[str, str]):
+        file_path, _ = file_and_last_modified
+        with open(file_path, "rb") as f:
+            last_modified_date = get_last_modified(None, f, False)
+        assert last_modified_date is None
+
+    # -- fixtures --------------------------------------------------------------------------------
+
+    @pytest.fixture()
+    def file_and_last_modified(self, tmp_path: pathlib.Path) -> tuple[str, str]:
+        modified_timestamp = dt.datetime(
+            year=2024, month=6, day=14, hour=15, minute=39, second=25
+        ).timestamp()
+        file_path = tmp_path / "some_file.txt"
+        file_path.write_text("abcdefg")
+        os.utime(file_path, (modified_timestamp, modified_timestamp))
+        return str(file_path), "2024-06-14T15:39:25"
+
+
+class Describe_get_last_modified_date:
+    def it_gets_the_modified_time_of_a_file_identified_by_a_path(self, tmp_path: pathlib.Path):
+        modified_timestamp = dt.datetime(
+            year=2024, month=3, day=5, hour=17, minute=43, second=40
+        ).timestamp()
+        file_path = tmp_path / "some_file.txt"
+        file_path.write_text("abcdefg")
+        os.utime(file_path, (modified_timestamp, modified_timestamp))
+
+        last_modified_date = get_last_modified_date(str(file_path))
+
+        assert last_modified_date == "2024-03-05T17:43:40"
+
+    def but_it_returns_None_when_there_is_no_file_at_that_path(self, tmp_path: pathlib.Path):
+        file_path = tmp_path / "some_file_that_does_not_exist.txt"
+
+        last_modified_date = get_last_modified_date(str(file_path))
+
+        assert last_modified_date is None
+
+
+class Describe_get_last_modified_date_from_file:
+    def it_gets_the_modified_time_of_a_file_like_object_corresponding_to_a_filesystem_file(
+        self, tmp_path: pathlib.Path
+    ):
+        modified_timestamp = dt.datetime(
+            year=2024, month=3, day=5, hour=20, minute=48, second=26
+        ).timestamp()
+        file_path = tmp_path / "some_file_2.txt"
+        file_path.write_text("abcdefg")
+        os.utime(file_path, (modified_timestamp, modified_timestamp))
+
+        with open(file_path, "rb") as f:
+            last_modified_date = get_last_modified_date_from_file(f)
+
+        assert last_modified_date == "2024-03-05T20:48:26"
+
+    def but_it_returns_None_when_the_argument_is_a_bytes_object(self):
+        assert get_last_modified_date_from_file(b"abcdefg") is None
+
+    def and_it_returns_None_when_the_file_like_object_has_no_name_attribute(self):
+        file = io.BytesIO(b"abcdefg")
+        assert hasattr(file, "name") is False
+
+        last_modified_date = get_last_modified_date_from_file(file)
+
+        assert last_modified_date is None
+
+    def and_it_returns_None_when_the_file_like_object_name_is_not_a_path_to_a_file(
+        self, tmp_path: pathlib.Path
+    ):
+        file = io.BytesIO(b"abcdefg")
+        file.name = str(tmp_path / "a_file_that_isn't_here.txt")
+
+        last_modified_date = get_last_modified_date_from_file(file)
+
+        assert last_modified_date is None
+
+
+# ================================================================================================
+# ELEMENT HIERARCHY
+# ================================================================================================
+
+
+def test_set_element_hierarchy():
+    elements_to_set = [
+        Title(text="Title"),  # 0
+        NarrativeText(text="NarrativeText"),  # 1
+        FigureCaption(text="FigureCaption"),  # 2
+        ListItem(text="ListItem"),  # 3
+        ListItem(text="ListItem", metadata=ElementMetadata(category_depth=1)),  # 4
+        ListItem(text="ListItem", metadata=ElementMetadata(category_depth=1)),  # 5
+        ListItem(text="ListItem"),  # 6
+        CheckBox(element_id="some-id-1", checked=True),  # 7
+        Title(text="Title 2"),  # 8
+        ListItem(text="ListItem"),  # 9
+        ListItem(text="ListItem"),  # 10
+        Text(text="Text"),  # 11
+    ]
+    elements = set_element_hierarchy(elements_to_set)
+
+    assert (
+        elements[1].metadata.parent_id == elements[0].id
+    ), "NarrativeText should be child of Title"
+    assert (
+        elements[2].metadata.parent_id == elements[0].id
+    ), "FigureCaption should be child of Title"
+    assert elements[3].metadata.parent_id == elements[0].id, "ListItem should be child of Title"
+    assert elements[4].metadata.parent_id == elements[3].id, "ListItem should be child of Title"
+    assert elements[5].metadata.parent_id == elements[3].id, "ListItem should be child of Title"
+    assert elements[6].metadata.parent_id == elements[0].id, "ListItem should be child of Title"
+    # NOTE(Hubert): moving the category field to Element, caused this to fail.
+    # Checkboxes will soon be deprecated, then we can remove the test.
+    # assert (
+    #         elements[7].metadata.parent_id is None
+    # ), "CheckBox should be None, as it's not a Text based element"
+    assert elements[8].metadata.parent_id is None, "Title 2 should be child of None"
+    assert elements[9].metadata.parent_id == elements[8].id, "ListItem should be child of Title 2"
+    assert elements[10].metadata.parent_id == elements[8].id, "ListItem should be child of Title 2"
+    assert elements[11].metadata.parent_id == elements[8].id, "Text should be child of Title 2"
+
+
+def test_set_element_hierarchy_custom_rule_set():
+    elements_to_set = [
+        Header(text="Header"),  # 0
+        Title(text="Title"),  # 1
+        NarrativeText(text="NarrativeText"),  # 2
+        Text(text="Text"),  # 3
+        Title(text="Title 2"),  # 4
+        FigureCaption(text="FigureCaption"),  # 5
+    ]
+
+    custom_rule_set = {
+        "Header": ["Title", "Text"],
+        "Title": ["NarrativeText", "UncategorizedText", "FigureCaption"],
+    }
+
+    elements = set_element_hierarchy(
+        elements=elements_to_set,
+        ruleset=custom_rule_set,
+    )
+
+    assert elements[1].metadata.parent_id == elements[0].id, "Title should be child of Header"
+    assert (
+        elements[2].metadata.parent_id == elements[1].id
+    ), "NarrativeText should be child of Title"
+    assert elements[3].metadata.parent_id == elements[1].id, "Text should be child of Title"
+    assert elements[4].metadata.parent_id == elements[0].id, "Title 2 should be child of Header"
+    assert (
+        elements[5].metadata.parent_id == elements[4].id
+    ), "FigureCaption should be child of Title 2"

unstructured/__version__.py

@@ -1 +1 @@
-__version__ = "0.15.13"  # pragma: no cover
+__version__ = "0.15.14-dev0"  # pragma: no cover

unstructured/file_utils/encoding.py

@@ -2,7 +2,7 @@ from typing import IO, Optional, Tuple, Union
 
 import chardet
 
-from unstructured.partition.common import convert_to_bytes
+from unstructured.partition.common.common import convert_to_bytes
 
 ENCODE_REC_THRESHOLD = 0.8
 

unstructured/file_utils/file_conversion.py

@@ -4,7 +4,7 @@ import os
 import tempfile
 from typing import IO
 
-from unstructured.partition.common import exactly_one
+from unstructured.partition.common.common import exactly_one
 from unstructured.utils import requires_dependencies
 
 

unstructured/file_utils/filetype.py

@@ -47,12 +47,12 @@ from unstructured.file_utils.encoding import detect_file_encoding, format_encodi
 from unstructured.file_utils.model import FileType
 from unstructured.logger import logger
 from unstructured.nlp.patterns import EMAIL_HEAD_RE, LIST_OF_DICTS_PATTERN
-from unstructured.partition.common import (
+from unstructured.partition.common.common import (
     add_element_metadata,
     exactly_one,
     remove_element_metadata,
-    set_element_hierarchy,
 )
+from unstructured.partition.common.metadata import set_element_hierarchy
 from unstructured.utils import get_call_args_applying_defaults, lazyproperty
 
 LIBMAGIC_AVAILABLE = bool(importlib.util.find_spec("magic"))
@@ -500,8 +500,8 @@ class _OleFileDifferentiator:
     @staticmethod
     def _check_ole_file_type(ctx: _FileTypeDetectionContext) -> FileType | None:
         with ctx.open() as f:
-            ole = OleFileIO(f)
+            ole = OleFileIO(f)  # pyright: ignore[reportUnknownVariableType]
-            root_storage = Storage.from_ole(ole)
+            root_storage = Storage.from_ole(ole)  # pyright: ignore[reportUnknownMemberType]
 
         for stream in root_storage.streams:
             if stream.name == "WordDocument":

unstructured/partition/api.py

@@ -9,7 +9,7 @@ from unstructured_client.models import shared
 
 from unstructured.documents.elements import Element
 from unstructured.logger import logger
-from unstructured.partition.common import exactly_one
+from unstructured.partition.common.common import exactly_one
 from unstructured.staging.base import elements_from_dicts, elements_from_json
 
 

unstructured/partition/auto.py

@@ -13,7 +13,7 @@ from unstructured.documents.elements import DataSourceMetadata, Element
 from unstructured.file_utils.filetype import detect_filetype, is_json_processable
 from unstructured.file_utils.model import FileType
 from unstructured.logger import logger
-from unstructured.partition.common import exactly_one
+from unstructured.partition.common.common import exactly_one
 from unstructured.partition.lang import check_language_args
 from unstructured.partition.utils.constants import PartitionStrategy
 from unstructured.utils import dependency_exists

unstructured/partition/common/common.py

@@ -1,9 +1,7 @@
 from __future__ import annotations
 
 import numbers
-import os
 import subprocess
-from datetime import datetime
 from io import BufferedReader, BytesIO, TextIOWrapper
 from tempfile import SpooledTemporaryFile
 from time import sleep
@@ -41,76 +39,6 @@ if TYPE_CHECKING:
     from unstructured_inference.inference.layout import DocumentLayout, PageLayout
     from unstructured_inference.inference.layoutelement import LayoutElement
 
-HIERARCHY_RULE_SET = {
-    "Title": [
-        "Text",
-        "UncategorizedText",
-        "NarrativeText",
-        "ListItem",
-        "BulletedText",
-        "Table",
-        "FigureCaption",
-        "CheckBox",
-        "Table",
-    ],
-    "Header": [
-        "Title",
-        "Text",
-        "UncategorizedText",
-        "NarrativeText",
-        "ListItem",
-        "BulletedText",
-        "Table",
-        "FigureCaption",
-        "CheckBox",
-        "Table",
-    ],
-}
-
-
-def get_last_modified(
-    filename: str | None, file: IO[bytes] | None, date_from_file_object: bool
-) -> str | None:
-    """Determine best available last-modified date from file or filename."""
-    if filename is not None:
-        return get_last_modified_date(filename)
-
-    if file is not None:
-        return get_last_modified_date_from_file(file) if date_from_file_object else None
-
-    return None
-
-
-def get_last_modified_date(filename: str) -> Optional[str]:
-    """Modification time of file at path `filename`, if it exists.
-
-    Returns `None` when `filename` is not a path to a file on the local filesystem.
-
-    Otherwise returns date and time in ISO 8601 string format (YYYY-MM-DDTHH:MM:SS) like
-    "2024-03-05T17:02:53".
-    """
-    if not os.path.isfile(filename):
-        return None
-
-    modify_date = datetime.fromtimestamp(os.path.getmtime(filename))
-    return modify_date.strftime("%Y-%m-%dT%H:%M:%S%z")
-
-
-def get_last_modified_date_from_file(file: IO[bytes] | bytes) -> Optional[str]:
-    """Modified timestamp of `file` if it corresponds to a file on the local filesystem."""
-    # -- a file-like object will have a name attribute if created by `open()` or if a name is
-    # -- assigned to it for metadata purposes. Use "" as default because the empty string is never
-    # -- a path to an actual file.
-    filename = str(getattr(file, "name", ""))
-
-    # -- there's no guarantee the path corresponds to an actual file on the filesystem. In
-    # -- particular, a user can set the `.name` attribute of an e.g. `io.BytesIO` object to
-    # -- populate the `.metadata.filename` fields for a payload perhaps downloaded via HTTP.
-    if not os.path.isfile(filename):
-        return None
-
-    return get_last_modified_date(filename)
-
 
 def normalize_layout_element(
     layout_element: LayoutElement | Element | dict[str, Any],
@@ -230,54 +158,6 @@ def layout_list_to_list_items(
     return list_items
 
 
-def set_element_hierarchy(
-    elements: list[Element], ruleset: dict[str, list[str]] = HIERARCHY_RULE_SET
-) -> list[Element]:
-    """Sets the parent_id for each element in the list of elements
-    based on the element's category, depth and a ruleset
-
-    """
-    stack: list[Element] = []
-    for element in elements:
-        if element.metadata.parent_id is not None:
-            continue
-        parent_id = None
-        element_category = getattr(element, "category", None)
-        element_category_depth = getattr(element.metadata, "category_depth", 0) or 0
-
-        if not element_category:
-            continue
-
-        while stack:
-            top_element: Element = stack[-1]
-            top_element_category = getattr(top_element, "category")
-            top_element_category_depth = (
-                getattr(
-                    top_element.metadata,
-                    "category_depth",
-                    0,
-                )
-                or 0
-            )
-
-            if (
-                top_element_category == element_category
-                and top_element_category_depth < element_category_depth
-            ) or (
-                top_element_category != element_category
-                and element_category in ruleset.get(top_element_category, [])
-            ):
-                parent_id = top_element.id
-                break
-
-            stack.pop()
-
-        element.metadata.parent_id = parent_id
-        stack.append(element)
-
-    return elements
-
-
 def add_element_metadata(
     element: Element,
     filename: Optional[str] = None,
@@ -580,7 +460,7 @@ def _get_page_image_metadata(page: PageLayout) -> dict[str, Any]:
 # FIXME: document here can be either DocumentLayout or HTMLDocument; HTMLDocument is defined in
 # unstructured.documents.html, which imports this module so we can't import the class for type
 # hints. Moreover, those two types of documents have different lists of attributes
-# UPDATE(scanny): HTMLDocument no longer uses this function, so it can be optimized for use by
+# UPDATE(scanny): HTMLDocument no longer exists, so this function can be optimized for use by
 # DocumentLayout only.
 def document_to_element_list(
     document: DocumentLayout,

unstructured/partition/common/metadata.py

@@ -0,0 +1,128 @@
+"""Helpers used across multiple partitioners to compute metadata."""
+
+from __future__ import annotations
+
+import datetime as dt
+import os
+from typing import IO, Optional, Sequence
+
+from unstructured.documents.elements import Element
+
+
+def get_last_modified(
+    filename: str | None, file: IO[bytes] | None, date_from_file_object: bool
+) -> str | None:
+    """Determine best available last-modified date from file or filename."""
+    if filename is not None:
+        return get_last_modified_date(filename)
+
+    if file is not None:
+        return get_last_modified_date_from_file(file) if date_from_file_object else None
+
+    return None
+
+
+def get_last_modified_date(filename: str) -> Optional[str]:
+    """Modification time of file at path `filename`, if it exists.
+
+    Returns `None` when `filename` is not a path to a file on the local filesystem.
+
+    Otherwise returns date and time in ISO 8601 string format (YYYY-MM-DDTHH:MM:SS) like
+    "2024-03-05T17:02:53".
+    """
+    if not os.path.isfile(filename):
+        return None
+
+    modify_date = dt.datetime.fromtimestamp(os.path.getmtime(filename))
+    return modify_date.strftime("%Y-%m-%dT%H:%M:%S%z")
+
+
+def get_last_modified_date_from_file(file: IO[bytes] | bytes) -> Optional[str]:
+    """Modified timestamp of `file` if it corresponds to a file on the local filesystem."""
+    # -- a file-like object will have a name attribute if created by `open()` or if a name is
+    # -- assigned to it for metadata purposes. Use "" as default because the empty string is never
+    # -- a path to an actual file.
+    filename = str(getattr(file, "name", ""))
+
+    # -- there's no guarantee the path corresponds to an actual file on the filesystem. In
+    # -- particular, a user can set the `.name` attribute of an e.g. `io.BytesIO` object to
+    # -- populate the `.metadata.filename` fields for a payload perhaps downloaded via HTTP.
+    if not os.path.isfile(filename):
+        return None
+
+    return get_last_modified_date(filename)
+
+
+HIERARCHY_RULE_SET = {
+    "Title": [
+        "Text",
+        "UncategorizedText",
+        "NarrativeText",
+        "ListItem",
+        "BulletedText",
+        "Table",
+        "FigureCaption",
+        "CheckBox",
+        "Table",
+    ],
+    "Header": [
+        "Title",
+        "Text",
+        "UncategorizedText",
+        "NarrativeText",
+        "ListItem",
+        "BulletedText",
+        "Table",
+        "FigureCaption",
+        "CheckBox",
+        "Table",
+    ],
+}
+
+
+def set_element_hierarchy(
+    elements: Sequence[Element], ruleset: dict[str, list[str]] = HIERARCHY_RULE_SET
+) -> list[Element]:
+    """Sets the parent_id for each element in the list of elements
+    based on the element's category, depth and a ruleset
+
+    """
+    stack: list[Element] = []
+    for element in elements:
+        if element.metadata.parent_id is not None:
+            continue
+        parent_id = None
+        element_category = getattr(element, "category", None)
+        element_category_depth = getattr(element.metadata, "category_depth", 0) or 0
+
+        if not element_category:
+            continue
+
+        while stack:
+            top_element: Element = stack[-1]
+            top_element_category = getattr(top_element, "category")
+            top_element_category_depth = (
+                getattr(
+                    top_element.metadata,
+                    "category_depth",
+                    0,
+                )
+                or 0
+            )
+
+            if (
+                top_element_category == element_category
+                and top_element_category_depth < element_category_depth
+            ) or (
+                top_element_category != element_category
+                and element_category in ruleset.get(top_element_category, [])
+            ):
+                parent_id = top_element.id
+                break
+
+            stack.pop()
+
+        element.metadata.parent_id = parent_id
+        stack.append(element)
+
+    return list(elements)

unstructured/partition/csv.py

@@ -16,7 +16,10 @@ from unstructured.documents.elements import (
 )
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import get_last_modified_date, get_last_modified_date_from_file
+from unstructured.partition.common.metadata import (
+    get_last_modified_date,
+    get_last_modified_date_from_file,
+)
 from unstructured.partition.lang import apply_lang_metadata
 from unstructured.utils import is_temp_file_path, lazyproperty
 

unstructured/partition/doc.py

@@ -8,11 +8,8 @@ from unstructured.chunking import add_chunking_strategy
 from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.common import convert_office_doc, exactly_one
-    convert_office_doc,
+from unstructured.partition.common.metadata import get_last_modified
-    exactly_one,
-    get_last_modified,
-)
 from unstructured.partition.docx import partition_docx
 
 

unstructured/partition/docx.py

@@ -46,7 +46,7 @@ from unstructured.documents.elements import (
 )
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/email.py

@@ -46,9 +46,8 @@ from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
 from unstructured.logger import logger
 from unstructured.nlp.patterns import EMAIL_DATETIMETZ_PATTERN_RE
-from unstructured.partition.common import (
+from unstructured.partition.common.common import convert_to_bytes, exactly_one
-    convert_to_bytes,
+from unstructured.partition.common.metadata import (
-    exactly_one,
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/epub.py

@@ -7,7 +7,8 @@ from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.file_conversion import convert_file_to_html_text_using_pandoc
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import exactly_one, get_last_modified
+from unstructured.partition.common.common import exactly_one
+from unstructured.partition.common.metadata import get_last_modified
 from unstructured.partition.html import partition_html
 
 DETECTION_ORIGIN: str = "epub"

unstructured/partition/html/partition.py

@@ -14,7 +14,10 @@ from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.encoding import read_txt_file
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import get_last_modified_date, get_last_modified_date_from_file
+from unstructured.partition.common.metadata import (
+    get_last_modified_date,
+    get_last_modified_date_from_file,
+)
 from unstructured.partition.html.parser import Flow, html_parser
 from unstructured.partition.lang import apply_lang_metadata
 from unstructured.utils import is_temp_file_path, lazyproperty

unstructured/partition/image.py

@@ -5,7 +5,7 @@ from typing import IO, Any, Optional
 from unstructured.chunking import add_chunking_strategy
 from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.filetype import add_metadata
-from unstructured.partition.common import exactly_one
+from unstructured.partition.common.common import exactly_one
 from unstructured.partition.lang import check_language_args
 from unstructured.partition.pdf import partition_pdf_or_image
 from unstructured.partition.utils.constants import PartitionStrategy

unstructured/partition/json.py

@@ -19,8 +19,8 @@ from unstructured.file_utils.filetype import (
     add_metadata_with_filetype,
     is_json_processable,
 )
-from unstructured.partition.common import (
+from unstructured.partition.common.common import exactly_one
-    exactly_one,
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/md.py

@@ -9,8 +9,8 @@ from unstructured.chunking import add_chunking_strategy
 from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.common import exactly_one
-    exactly_one,
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/msg.py

@@ -14,7 +14,7 @@ from unstructured.documents.elements import Element, ElementMetadata, process_me
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
 from unstructured.logger import logger
-from unstructured.partition.common import (
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/odt.py

@@ -8,7 +8,8 @@ from unstructured.chunking import add_chunking_strategy
 from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import exactly_one, get_last_modified
+from unstructured.partition.common.common import exactly_one
+from unstructured.partition.common.metadata import get_last_modified
 from unstructured.partition.docx import partition_docx
 from unstructured.utils import requires_dependencies
 

unstructured/partition/org.py

@@ -7,7 +7,8 @@ from unstructured.documents.elements import Element
 from unstructured.file_utils.file_conversion import convert_file_to_html_text_using_pandoc
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import exactly_one, get_last_modified
+from unstructured.partition.common.common import exactly_one
+from unstructured.partition.common.metadata import get_last_modified
 from unstructured.partition.html import partition_html
 
 DETECTION_ORIGIN: str = "org"

unstructured/partition/pdf.py

@@ -42,7 +42,7 @@ from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
 from unstructured.logger import logger, trace_logger
 from unstructured.nlp.patterns import PARAGRAPH_PATTERN
-from unstructured.partition.common import (
+from unstructured.partition.common.common import (
     document_to_element_list,
     exactly_one,
     ocr_data_to_elements,

unstructured/partition/pdf_image/pdf_image_utils.py

@@ -17,16 +17,16 @@ from PIL import Image
 
 from unstructured.documents.elements import ElementType
 from unstructured.logger import logger
-from unstructured.partition.common import (
+from unstructured.partition.common.common import convert_to_bytes, exactly_one
-    convert_to_bytes,
+from unstructured.partition.common.metadata import (
-    exactly_one,
     get_last_modified_date,
     get_last_modified_date_from_file,
 )
 from unstructured.partition.utils.config import env_config
 
 if TYPE_CHECKING:
-    from unstructured_inference.inference.layout import DocumentLayout, PageLayout, TextRegion
+    from unstructured_inference.inference.elements import TextRegion
+    from unstructured_inference.inference.layout import DocumentLayout, PageLayout
     from unstructured_inference.inference.layoutelement import LayoutElement
 
     from unstructured.documents.elements import Element

unstructured/partition/ppt.py

@@ -8,9 +8,8 @@ from unstructured.chunking import add_chunking_strategy
 from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.common import convert_office_doc, exactly_one
-    convert_office_doc,
+from unstructured.partition.common.metadata import (
-    exactly_one,
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/pptx.py

@@ -36,8 +36,8 @@ from unstructured.documents.elements import (
 )
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.common import convert_ms_office_table_to_text
-    convert_ms_office_table_to_text,
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/rst.py

@@ -7,7 +7,8 @@ from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.file_conversion import convert_file_to_html_text_using_pandoc
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import exactly_one, get_last_modified
+from unstructured.partition.common.common import exactly_one
+from unstructured.partition.common.metadata import get_last_modified
 from unstructured.partition.html import partition_html
 
 DETECTION_ORIGIN: str = "rst"

unstructured/partition/rtf.py

@@ -7,7 +7,8 @@ from unstructured.documents.elements import Element, process_metadata
 from unstructured.file_utils.file_conversion import convert_file_to_html_text_using_pandoc
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import exactly_one, get_last_modified
+from unstructured.partition.common.common import exactly_one
+from unstructured.partition.common.metadata import get_last_modified
 from unstructured.partition.html import partition_html
 
 DETECTION_ORIGIN: str = "rtf"

unstructured/partition/text.py

@@ -29,8 +29,8 @@ from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
 from unstructured.nlp.patterns import PARAGRAPH_PATTERN, UNICODE_BULLETS_RE
 from unstructured.nlp.tokenize import sent_tokenize
-from unstructured.partition.common import (
+from unstructured.partition.common.common import exactly_one
-    exactly_one,
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
 )

unstructured/partition/tsv.py

@@ -14,11 +14,13 @@ from unstructured.documents.elements import (
 )
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.common import (
     exactly_one,
+    spooled_to_bytes_io_if_needed,
+)
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
-    spooled_to_bytes_io_if_needed,
 )
 from unstructured.partition.lang import apply_lang_metadata
 

unstructured/partition/xlsx.py

@@ -26,7 +26,10 @@ from unstructured.documents.elements import (
 )
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import get_last_modified_date, get_last_modified_date_from_file
+from unstructured.partition.common.metadata import (
+    get_last_modified_date,
+    get_last_modified_date_from_file,
+)
 from unstructured.partition.lang import apply_lang_metadata
 from unstructured.partition.text_type import (
     is_bulleted_text,

unstructured/partition/xml.py

@@ -16,11 +16,13 @@ from unstructured.documents.elements import (
 from unstructured.file_utils.encoding import read_txt_file
 from unstructured.file_utils.filetype import add_metadata_with_filetype
 from unstructured.file_utils.model import FileType
-from unstructured.partition.common import (
+from unstructured.partition.common.common import (
     exactly_one,
+    spooled_to_bytes_io_if_needed,
+)
+from unstructured.partition.common.metadata import (
     get_last_modified_date,
     get_last_modified_date_from_file,
-    spooled_to_bytes_io_if_needed,
 )
 from unstructured.partition.lang import apply_lang_metadata
 from unstructured.partition.text import element_from_text

unstructured/staging/base.py

@@ -16,7 +16,7 @@ from unstructured.documents.elements import (
     Element,
     ElementMetadata,
 )
-from unstructured.partition.common import exactly_one
+from unstructured.partition.common.common import exactly_one
 from unstructured.utils import Point, dependency_exists, requires_dependencies
 
 if dependency_exists("pandas"):