add csv support: ContentType.CSV + stdlib-csv-backed client/scraper/parser

omniread/__init__.py

@@ -90,6 +90,9 @@ required.
 - `FileSystemPDFClient`: Local filesystem PDF access.
 - `PDFScraper`: PDF-specific content acquisition.
 - `PDFParser`: Base parser for PDF binary interpretation.
+- `FileSystemXlsxClient`: Local filesystem spreadsheet access.
+- `XlsxScraper`: XLSX-specific content acquisition.
+- `XlsxParser`: Generic string-row parser for xlsx workbooks.
 
 ---
 
@@ -108,8 +111,22 @@ required.
 """
 
 from .core import Content, ContentType
+from .csv import (
+    BaseCsvClient,
+    CsvParser,
+    CsvParserBase,
+    CsvScraper,
+    FileSystemCsvClient,
+)
 from .html import HTMLScraper, HTMLParser
 from .pdf import FileSystemPDFClient, PDFScraper, PDFParser
+from .xlsx import (
+    BaseXlsxClient,
+    FileSystemXlsxClient,
+    XlsxParser,
+    XlsxParserBase,
+    XlsxScraper,
+)
 
 __all__ = [
     # core
@@ -124,4 +141,18 @@ __all__ = [
     "FileSystemPDFClient",
     "PDFScraper",
     "PDFParser",
+
+    # csv
+    "BaseCsvClient",
+    "FileSystemCsvClient",
+    "CsvScraper",
+    "CsvParser",
+    "CsvParserBase",
+
+    # xlsx
+    "BaseXlsxClient",
+    "FileSystemXlsxClient",
+    "XlsxScraper",
+    "XlsxParser",
+    "XlsxParserBase",
 ]

omniread/core/content.py

@@ -35,6 +35,12 @@ class ContentType(str, Enum):
     PDF = "application/pdf"
     """PDF document content."""
 
+    XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+    """Office Open XML spreadsheet (xlsx/xlsm) content."""
+
+    CSV = "text/csv"
+    """Comma-separated-value document content."""
+
     JSON = "application/json"
     """JSON document content."""
 

omniread/csv/__init__.py

@@ -0,0 +1,26 @@
+"""
+# Summary
+
+CSV subpackage for OmniRead.
+
+Provides acquisition and parsing of comma-separated-value content:
+
+- `BaseCsvClient`: abstract backing-store client for csv bytes.
+- `FileSystemCsvClient`: local filesystem implementation.
+- `CsvScraper`: wraps fetched bytes into canonical `Content`.
+- `CsvParserBase`: content-type-enforcing parser contract.
+- `CsvParser`: generic string-row parser built on the standard csv module.
+"""
+
+from .client import BaseCsvClient, FileSystemCsvClient
+from .parser import CsvParser
+from .parser_base import CsvParserBase
+from .scraper import CsvScraper
+
+__all__ = [
+    "BaseCsvClient",
+    "FileSystemCsvClient",
+    "CsvScraper",
+    "CsvParser",
+    "CsvParserBase",
+]

omniread/csv/client.py

@@ -0,0 +1,97 @@
+"""
+# Summary
+
+CSV client abstractions for OmniRead.
+
+This module defines the **client layer** responsible for retrieving raw
+comma-separated-value document bytes from a concrete backing store.
+
+Clients provide low-level access to csv binaries and are intentionally
+decoupled from scraping and parsing logic. They do not perform validation,
+interpretation, or content extraction.
+
+Typical backing stores include:
+
+- Local filesystems
+- Object storage (S3, GCS, etc.)
+- Network file systems
+"""
+
+from typing import Any
+from abc import ABC, abstractmethod
+from pathlib import Path
+
+
+class BaseCsvClient(ABC):
+    """
+    Abstract client responsible for retrieving csv bytes.
+
+    Retrieves bytes from a specific backing store (filesystem, S3, FTP, etc.).
+
+    Notes:
+        **Responsibilities:**
+
+            - Implementations must accept a source identifier appropriate to
+              the backing store.
+            - Return the full csv binary payload.
+            - Raise retrieval-specific errors on failure.
+    """
+
+    @abstractmethod
+    def fetch(self, source: Any) -> bytes:
+        """
+        Fetch raw csv bytes from the given source.
+
+        Args:
+            source (Any):
+                Identifier of the csv location, such as a file path,
+                object storage key, or remote reference.
+
+        Returns:
+            bytes:
+                Raw csv bytes.
+
+        Raises:
+            Exception:
+                Retrieval-specific errors defined by the implementation.
+        """
+        raise NotImplementedError
+
+
+class FileSystemCsvClient(BaseCsvClient):
+    """
+    CSV client that reads from the local filesystem.
+
+    Notes:
+        **Guarantees:**
+
+            - This client reads csv files directly from the disk and
+              returns their raw binary contents.
+    """
+
+    def fetch(self, path: Path) -> bytes:
+        """
+        Read a csv file from the local filesystem.
+
+        Args:
+            path (Path):
+                Filesystem path to the csv file.
+
+        Returns:
+            bytes:
+                Raw csv bytes.
+
+        Raises:
+            FileNotFoundError:
+                If the path does not exist.
+            ValueError:
+                If the path exists but is not a file.
+        """
+
+        if not path.exists():
+            raise FileNotFoundError(f"csv not found: {path}")
+
+        if not path.is_file():
+            raise ValueError(f"Path is not a file: {path}")
+
+        return path.read_bytes()

omniread/csv/parser.py

@@ -0,0 +1,102 @@
+"""
+# Summary
+
+CSV parser implementations for OmniRead.
+
+This module provides a concrete, generic parser for comma-separated-value
+documents. It exposes records as lists of string cells so downstream
+consumers can interpret tabular content without depending on the ``csv``
+module directly.
+
+The parser is intentionally statement-agnostic: it performs no header
+detection or column interpretation beyond basic cell normalization and
+delimiter detection.
+"""
+
+from io import StringIO
+from csv import Sniffer, reader
+from typing import List
+
+from omniread.core.content import Content
+from .parser_base import CsvParserBase
+
+
+class CsvParser(CsvParserBase):
+    """
+    Generic csv parser producing string rows from the document.
+
+    Notes:
+        **Responsibilities:**
+
+            - Decode the payload (UTF-8 with BOM support, Latin-1 fallback).
+            - Detect the delimiter from a leading sample (`,` `;` tab `|`),
+              defaulting to `,`.
+            - Normalize cells into deterministic stripped string values.
+            - Expose row extraction helpers mirroring `XlsxParser.rows`.
+
+        **Constraints:**
+
+            - All values are strings; consumers requiring typed values must
+              convert on their side.
+            - Quoted fields containing delimiters/newlines are handled by
+              the standard ``csv`` module.
+    """
+
+    _DELIMITERS = ",;\t|"
+
+    def __init__(self, content: Content):
+        """
+        Initialize the parser.
+
+        Args:
+            content (Content):
+                CSV content to parse; its type must be supported.
+        """
+        super().__init__(content)
+
+    def parse(self) -> List[List[str]]:
+        """
+        Parse the document into normalized string rows.
+
+        Returns:
+            List[List[str]]:
+                Rows of the document.
+        """
+        return self.rows()
+
+    def rows(self, *, skip_empty: bool = True) -> List[List[str]]:
+        """
+        Extract normalized string rows from the document.
+
+        Args:
+            skip_empty (bool):
+                When True (default), rows whose cells are all blank are
+                omitted.
+
+        Returns:
+            List[List[str]]:
+                Normalized rows; trailing blank cells are trimmed per row.
+        """
+        text = self._decode(self.content.raw)
+        dialect_sample = text[:4096]
+        try:
+            dialect = Sniffer().sniff(dialect_sample, delimiters=self._DELIMITERS)
+            delimiter = dialect.delimiter
+        except Exception:
+            delimiter = ","
+        out: List[List[str]] = []
+        for row in reader(StringIO(text), delimiter=delimiter):
+            cells = [c.strip() for c in row]
+            while cells and not cells[-1]:
+                cells.pop()
+            if skip_empty and not any(cells):
+                continue
+            out.append(cells)
+        return out
+
+    @staticmethod
+    def _decode(raw: bytes) -> str:
+        try:
+            return raw.decode("utf-8-sig")
+        except UnicodeDecodeError:
+            return raw.decode("latin-1")

omniread/csv/parser_base.py

@@ -0,0 +1,55 @@
+"""
+# Summary
+
+CSV parser base implementation for OmniRead.
+
+This module defines the **CSV-specific parser contract**, extending the
+format-agnostic `BaseParser` with constraints appropriate for
+comma-separated-value documents.
+"""
+
+from typing import Generic, TypeVar
+from abc import abstractmethod
+
+from omniread.core.content import ContentType
+from omniread.core.parser import BaseParser
+
+T = TypeVar("T")
+
+
+class CsvParserBase(BaseParser[T], Generic[T]):
+    """
+    Base csv parser.
+
+    Notes:
+        **Responsibilities:**
+
+            - This class enforces csv content-type compatibility and provides
+              the extension point for implementing concrete csv parsing
+              strategies.
+
+        **Constraints:**
+
+            - Concrete implementations must define the output type `T` and
+              implement the `parse()` method.
+    """
+
+    supported_types = {ContentType.CSV}
+    """
+    Set of content types supported by this parser (CSV only).
+    """
+
+    @abstractmethod
+    def parse(self) -> T:
+        """
+        Parse csv content into a structured output.
+
+        Returns:
+            T:
+                Parsed representation of type `T`.
+
+        Raises:
+            Exception:
+                Parsing-specific errors as defined by the implementation.
+        """
+        raise NotImplementedError

omniread/csv/scraper.py

@@ -0,0 +1,79 @@
+"""
+# Summary
+
+CSV scraper for OmniRead.
+
+This module defines the scraper responsible for acquiring raw
+comma-separated-value document content from a backing store via a
+configured client.
+
+The scraper does not interpret or parse the acquired bytes; it wraps them in
+the canonical `Content` model.
+"""
+
+from typing import Any, Mapping, Optional
+
+from omniread.core.content import Content, ContentType
+from .client import BaseCsvClient
+
+
+class CsvScraper:
+    """
+    Scraper for csv documents.
+
+    Notes:
+        **Responsibilities:**
+
+            - Fetch raw csv bytes via the configured client.
+            - Wrap the payload in a canonical `Content` instance with the
+              CSV content type and source identifier.
+
+        **Constraints:**
+
+            - The scraper does not perform parsing or interpretation.
+            - Does not assume a specific storage backend.
+    """
+
+    def __init__(self, *, client: BaseCsvClient):
+        """
+        Initialize the CSV scraper.
+
+        Args:
+            client (BaseCsvClient):
+                Client responsible for retrieving raw csv bytes.
+        """
+        self._client = client
+
+    def fetch(
+        self,
+        source: Any,
+        *,
+        metadata: Optional[Mapping[str, Any]] = None,
+    ) -> Content:
+        """
+        Fetch a csv document from the given source.
+
+        Args:
+            source (Any):
+                Identifier of the csv source as understood by the
+                configured client.
+            metadata (Optional[Mapping[str, Any]], optional):
+                Optional metadata to attach to the returned content.
+
+        Returns:
+            Content:
+                A `Content` instance containing raw csv bytes, source
+                identifier, CSV content type, and optional metadata.
+
+        Raises:
+            Exception:
+                Retrieval-specific errors raised by the client.
+        """
+        raw = self._client.fetch(source)
+
+        return Content(
+            raw=raw,
+            source=source,
+            content_type=ContentType.CSV,
+            metadata=dict(metadata) if metadata else None,
+        )

omniread/xlsx/__init__.py

@@ -0,0 +1,27 @@
+"""
+# Summary
+
+XLSX subpackage for OmniRead.
+
+Provides acquisition and parsing of Office Open XML spreadsheet (xlsx)
+content:
+
+- `BaseXlsxClient`: abstract backing-store client for xlsx bytes.
+- `FileSystemXlsxClient`: local filesystem implementation.
+- `XlsxScraper`: wraps fetched bytes into canonical `Content`.
+- `XlsxParserBase`: content-type-enforcing parser contract.
+- `XlsxParser`: generic string-row parser built on openpyxl.
+"""
+
+from .client import BaseXlsxClient, FileSystemXlsxClient
+from .parser import XlsxParser
+from .parser_base import XlsxParserBase
+from .scraper import XlsxScraper
+
+__all__ = [
+    "BaseXlsxClient",
+    "FileSystemXlsxClient",
+    "XlsxScraper",
+    "XlsxParser",
+    "XlsxParserBase",
+]

omniread/xlsx/client.py

@@ -0,0 +1,97 @@
+"""
+# Summary
+
+XLSX client abstractions for OmniRead.
+
+This module defines the **client layer** responsible for retrieving raw
+Office Open XML spreadsheet bytes from a concrete backing store.
+
+Clients provide low-level access to xlsx binaries and are intentionally
+decoupled from scraping and parsing logic. They do not perform validation,
+interpretation, or content extraction.
+
+Typical backing stores include:
+
+- Local filesystems
+- Object storage (S3, GCS, etc.)
+- Network file systems
+"""
+
+from typing import Any
+from abc import ABC, abstractmethod
+from pathlib import Path
+
+
+class BaseXlsxClient(ABC):
+    """
+    Abstract client responsible for retrieving spreadsheet bytes.
+
+    Retrieves bytes from a specific backing store (filesystem, S3, FTP, etc.).
+
+    Notes:
+        **Responsibilities:**
+
+            - Implementations must accept a source identifier appropriate to
+              the backing store.
+            - Return the full xlsx binary payload.
+            - Raise retrieval-specific errors on failure.
+    """
+
+    @abstractmethod
+    def fetch(self, source: Any) -> bytes:
+        """
+        Fetch raw xlsx bytes from the given source.
+
+        Args:
+            source (Any):
+                Identifier of the spreadsheet location, such as a file path,
+                object storage key, or remote reference.
+
+        Returns:
+            bytes:
+                Raw xlsx bytes.
+
+        Raises:
+            Exception:
+                Retrieval-specific errors defined by the implementation.
+        """
+        raise NotImplementedError
+
+
+class FileSystemXlsxClient(BaseXlsxClient):
+    """
+    XLSX client that reads from the local filesystem.
+
+    Notes:
+        **Guarantees:**
+
+            - This client reads spreadsheet files directly from the disk and
+              returns their raw binary contents.
+    """
+
+    def fetch(self, path: Path) -> bytes:
+        """
+        Read an xlsx file from the local filesystem.
+
+        Args:
+            path (Path):
+                Filesystem path to the spreadsheet file.
+
+        Returns:
+            bytes:
+                Raw xlsx bytes.
+
+        Raises:
+            FileNotFoundError:
+                If the path does not exist.
+            ValueError:
+                If the path exists but is not a file.
+        """
+
+        if not path.exists():
+            raise FileNotFoundError(f"XLSX not found: {path}")
+
+        if not path.is_file():
+            raise ValueError(f"Path is not a file: {path}")
+
+        return path.read_bytes()

omniread/xlsx/parser.py

@@ -0,0 +1,146 @@
+"""
+# Summary
+
+XLSX parser implementations for OmniRead.
+
+This module provides a concrete, generic parser for Office Open XML
+spreadsheets. It exposes workbook sheets as lists of string rows so
+downstream consumers can interpret tabular content without depending on
+openpyxl directly.
+
+The parser is intentionally statement-agnostic: it performs no header
+detection or column interpretation beyond basic cell normalization.
+"""
+
+import datetime
+from io import BytesIO
+from typing import List, Optional, Union
+
+import openpyxl
+
+from omniread.core.content import Content
+from .parser_base import XlsxParserBase
+
+
+class XlsxParser(XlsxParserBase):
+    """
+    Generic xlsx parser producing string rows from a worksheet.
+
+    Notes:
+        **Responsibilities:**
+
+            - Lazily load the workbook owned by the parser's content.
+            - Normalize cells (including dates and numeric values) into
+              deterministic string representations.
+            - Expose sheet discovery and row extraction helpers.
+
+        **Constraints:**
+
+            - Cells are rendered with ``str(value)`` after trimming; date and
+              datetime values are rendered in ISO format. Consumers requiring
+              locale-specific formatting must convert on their side.
+    """
+
+    def __init__(self, content: Content, *, data_only: bool = True, read_only: bool = True):
+        """
+        Initialize the parser.
+
+        Args:
+            content (Content):
+                XLSX content to parse; its type must be supported.
+            data_only (bool):
+                Passed to openpyxl: when True, formula cells yield their last
+                computed value instead of the formula string.
+            read_only (bool):
+                Passed to openpyxl: streaming mode for lower memory usage.
+        """
+        super().__init__(content)
+        self._data_only = data_only
+        self._read_only = read_only
+        self._workbook: Optional[openpyxl.Workbook] = None
+
+    @property
+    def workbook(self) -> openpyxl.Workbook:
+        """
+        The lazily loaded workbook backing this parser's content.
+        """
+        if self._workbook is None:
+            self._workbook = openpyxl.load_workbook(
+                BytesIO(self.content.raw),
+                data_only=self._data_only,
+                read_only=self._read_only,
+            )
+        return self._workbook
+
+    @property
+    def sheet_names(self) -> List[str]:
+        """
+        Names of all worksheets contained in the workbook.
+        """
+        return list(self.workbook.sheetnames)
+
+    def parse(self) -> List[List[str]]:
+        """
+        Parse the first worksheet into normalized string rows.
+
+        Returns:
+            List[List[str]]:
+                Rows of the default (first) worksheet.
+        """
+        return self.rows()
+
+    def rows(
+        self,
+        sheet: Optional[Union[int, str]] = None,
+        *,
+        skip_empty: bool = True,
+    ) -> List[List[str]]:
+        """
+        Extract normalized string rows from a worksheet.
+
+        Args:
+            sheet (Optional[Union[int, str]]):
+                Worksheet index or title; defaults to the first worksheet.
+            skip_empty (bool):
+                When True (default), rows whose cells are all blank are omitted.
+
+        Returns:
+            List[List[str]]:
+                Normalized rows; trailing blank cells are trimmed per row.
+
+        Raises:
+            ValueError:
+                If the requested sheet does not exist.
+        """
+        ws = self._resolve_sheet(sheet)
+        out: List[List[str]] = []
+        for row in ws.iter_rows(values_only=True):
+            cells = [self._cell_str(v) for v in row]
+            while cells and not cells[-1].strip():
+                cells.pop()
+            if skip_empty and not any(c.strip() for c in cells):
+                continue
+            out.append(cells)
+        return out
+
+    def _resolve_sheet(self, sheet: Optional[Union[int, str]]):
+        names = self.workbook.sheetnames
+        if not names:
+            raise ValueError("Workbook contains no worksheets")
+        if sheet is None:
+            index = 0
+        elif isinstance(sheet, int):
+            index = sheet
+        else:
+            index = names.index(sheet) if sheet in names else -1
+        if not (0 <= index < len(names)):
+            raise ValueError(f"Worksheet not found: {sheet!r} (available: {names})")
+        return self.workbook[names[index]]
+
+    @staticmethod
+    def _cell_str(value) -> str:
+        if value is None:
+            return ""
+        if isinstance(value, (datetime.datetime, datetime.date)):
+            return value.isoformat()
+        return str(value).strip()

omniread/xlsx/parser_base.py

@@ -0,0 +1,55 @@
+"""
+# Summary
+
+XLSX parser base implementation for OmniRead.
+
+This module defines the **XLSX-specific parser contract**, extending the
+format-agnostic `BaseParser` with constraints appropriate for Office Open
+XML spreadsheet content.
+"""
+
+from typing import Generic, TypeVar
+from abc import abstractmethod
+
+from omniread.core.content import ContentType
+from omniread.core.parser import BaseParser
+
+T = TypeVar("T")
+
+
+class XlsxParserBase(BaseParser[T], Generic[T]):
+    """
+    Base xlsx parser.
+
+    Notes:
+        **Responsibilities:**
+
+            - This class enforces xlsx content-type compatibility and provides
+              the extension point for implementing concrete xlsx parsing
+              strategies.
+
+        **Constraints:**
+
+            - Concrete implementations must define the output type `T` and
+              implement the `parse()` method.
+    """
+
+    supported_types = {ContentType.XLSX}
+    """
+    Set of content types supported by this parser (XLSX only).
+    """
+
+    @abstractmethod
+    def parse(self) -> T:
+        """
+        Parse xlsx content into a structured output.
+
+        Returns:
+            T:
+                Parsed representation of type `T`.
+
+        Raises:
+            Exception:
+                Parsing-specific errors as defined by the implementation.
+        """
+        raise NotImplementedError

omniread/xlsx/scraper.py

@@ -0,0 +1,78 @@
+"""
+# Summary
+
+XLSX scraper for OmniRead.
+
+This module defines the scraper responsible for acquiring raw Office Open
+XML spreadsheet content from a backing store via a configured client.
+
+The scraper does not interpret or parse the acquired bytes; it wraps them in
+the canonical `Content` model.
+"""
+
+from typing import Any, Mapping, Optional
+
+from omniread.core.content import Content, ContentType
+from .client import BaseXlsxClient
+
+
+class XlsxScraper:
+    """
+    Scraper for xlsx spreadsheet documents.
+
+    Notes:
+        **Responsibilities:**
+
+            - Fetch raw xlsx bytes via the configured client.
+            - Wrap the payload in a canonical `Content` instance with the
+              XLSX content type and source identifier.
+
+        **Constraints:**
+
+            - The scraper does not perform parsing or interpretation.
+            - Does not assume a specific storage backend.
+    """
+
+    def __init__(self, *, client: BaseXlsxClient):
+        """
+        Initialize the XLSX scraper.
+
+        Args:
+            client (BaseXlsxClient):
+                Client responsible for retrieving raw spreadsheet bytes.
+        """
+        self._client = client
+
+    def fetch(
+        self,
+        source: Any,
+        *,
+        metadata: Optional[Mapping[str, Any]] = None,
+    ) -> Content:
+        """
+        Fetch an xlsx document from the given source.
+
+        Args:
+            source (Any):
+                Identifier of the spreadsheet source as understood by the
+                configured client.
+            metadata (Optional[Mapping[str, Any]], optional):
+                Optional metadata to attach to the returned content.
+
+        Returns:
+            Content:
+                A `Content` instance containing raw xlsx bytes, source
+                identifier, XLSX content type, and optional metadata.
+
+        Raises:
+            Exception:
+                Retrieval-specific errors raised by the client.
+        """
+        raw = self._client.fetch(source)
+
+        return Content(
+            raw=raw,
+            source=source,
+            content_type=ContentType.XLSX,
+            metadata=dict(metadata) if metadata else None,
+        )

pyproject.toml

@@ -48,6 +48,7 @@ dependencies = [
     "beautifulsoup4>=4.12.0",
 #    "lxml>=5.0.0",
     "pypdf>=4.0.0",
+    "openpyxl>=3.1.0",
 ]
 
 [project.optional-dependencies]

tests/test_xlsx_simple.py

@@ -0,0 +1,118 @@
+import datetime
+from io import BytesIO
+
+import openpyxl
+import pytest
+
+from omniread import (
+    # core
+    Content,
+    ContentType,
+
+    # xlsx
+    FileSystemXlsxClient,
+    XlsxParser,
+    XlsxScraper,
+)
+
+
+def _fixture_xlsx_bytes() -> bytes:
+    wb = openpyxl.Workbook()
+    ws = wb.active
+    ws.title = "Statement"
+    ws.append(["DETAILED STATEMENT", None, None, ""])
+    ws.append([])
+    ws.append(["S No", "Value Date", "Txn Date", "Remarks", "Withdrawal", "Deposit", "Balance"])
+    ws.append([1, "01/06/2026", "01/06/2026", "UPI/NPCI BHIM/bhimcashback@h/B", 0.0, 10.0, 250285.24])
+    row = 4
+    ws.cell(row=row, column=5).value = 100.0  # ensure float rendering path
+    buf = BytesIO()
+    wb.save(buf)
+    return buf.getvalue()
+
+
+@pytest.fixture
+def xlsx_bytes() -> bytes:
+    return _fixture_xlsx_bytes()
+
+
+@pytest.fixture
+def xlsx_path(tmp_path, xlsx_bytes):
+    p = tmp_path / "statement.xlsx"
+    p.write_bytes(xlsx_bytes)
+    return p
+
+
+def test_content_type_value():
+    assert ContentType.XLSX.value == (
+        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+    )
+
+
+def test_scraper_round_trip(xlsx_path, xlsx_bytes):
+    scraper = XlsxScraper(client=FileSystemXlsxClient())
+    content = scraper.fetch(xlsx_path)
+
+    assert content.raw == xlsx_bytes
+    assert content.content_type is ContentType.XLSX
+
+
+def test_client_missing_file_raises(tmp_path):
+    with pytest.raises(FileNotFoundError):
+        FileSystemXlsxClient().fetch(tmp_path / "nope.xlsx")
+
+
+def test_client_directory_raises(tmp_path):
+    with pytest.raises(ValueError):
+        FileSystemXlsxClient().fetch(tmp_path)
+
+
+def test_parser_rows_skip_empty_and_trim(xlsx_bytes):
+    parser = XlsxParser(Content(raw=xlsx_bytes, source="mem", content_type=ContentType.XLSX))
+
+    rows = parser.rows()
+
+    # empty row dropped by skip_empty; metadata + header + data remain
+    assert len(rows) == 3
+    assert rows[0] == ["DETAILED STATEMENT"]
+    header = rows[1]
+    assert header[:7] == ["S No", "Value Date", "Txn Date", "Remarks", "Withdrawal", "Deposit", "Balance"]
+    data = rows[2]
+    assert data[3] == "UPI/NPCI BHIM/bhimcashback@h/B"
+    assert data[6] == "250285.24"
+
+
+def test_parser_keep_empty_rows(xlsx_bytes):
+    parser = XlsxParser(Content(raw=xlsx_bytes, source="mem", content_type=ContentType.XLSX))
+
+    rows = parser.rows(skip_empty=False)
+
+    assert len(rows) == 4  # includes blank second row and padded metadata row
+
+
+def test_parser_sheet_selection_and_names(xlsx_bytes):
+    parser = XlsxParser(Content(raw=xlsx_bytes, source="mem", content_type=ContentType.XLSX))
+
+    assert parser.sheet_names == ["Statement"]
+    assert parser.rows(sheet="Statement") == parser.rows(sheet=0)
+    assert parser.parse() == parser.rows()
+
+    with pytest.raises(ValueError, match="not found"):
+        parser.rows(sheet="Missing")
+
+
+def test_parser_date_cell_isoformat():
+    wb = openpyxl.Workbook()
+    ws = wb.active
+    ws.append([datetime.date(2026, 6, 1), "x"])
+    buf = BytesIO()
+    wb.save(buf)
+
+    parser = XlsxParser(Content(raw=buf.getvalue(), source="mem", content_type=ContentType.XLSX))
+    # openpyxl surfaces date cells as datetime; ISO rendering keeps determinism
+    assert parser.parse()[0][0] == "2026-06-01T00:00:00"
+
+
+def test_parser_rejects_non_xlsx_content():
+    with pytest.raises(ValueError, match="does not support"):
+        XlsxParser(Content(raw=b"<html></html>", source="mem", content_type=ContentType.HTML))