SplitGrid

Asymmetric split-grid serialization for rectangular numeric and mixed-type grids.

This package was pulled out of WriterAgent (LibreOffice Writer/Calc/Draw AI extension). It is the same host flatten + child unpack codec that lived in plugin.scripting.payload_codec, plus the optional Cython flatten accelerator from native/writeragent_vec. WriterAgent can later depend on splitgrid without changing the wire dict.

Repo: github.com/KeithCu/writeragent

What split-grid is

The compute path is asymmetric by design:

  • Host pack (LibreOffice’s embedded Python, or any NumPy-free interpreter) flattens a 1D or 2D grid into a contiguous float64 buffer plus a sparse integer-keyed strings map. Empty cells become NaN. Zip codes like "02138" stay strings — they are never parsed as floats.
  • Child unpack (venv with NumPy) materializes a pure-numeric grid (strings == {}) with np.frombuffer (ndarray). Mixed grids use a vectorized object-masking path and return nested lists, restoring None for NaN holes.
  • Host unpack preserves float('nan') from the buffer (does not coerce holes to None). That is the locked egress policy: NaN becomes a Calc error, not a silent blank.

Grids with fewer than 100 cells (BINARY_MIN_CELLS) stay nested Python lists. Force "always" / "never" overrides that threshold (used by A/B tests).

Wire envelope (Pickle5-friendly dict, same keys as WriterAgent):

{
    "__wa_payload__": "split_grid",
    "dtype": "float64",
    "column_kinds": ["int", "float"],  # per column: int / float / bool
    "shape": [rows, cols],             # or [n] for 1D
    "buffer": b"...",                  # row-major float64 bytes
    "strings": {7: "banana"},          # integer keys, not str(idx)
}

There is no datetime lane on the float64 buffer. Python datetime objects stringify into strings. Do not add a 'date' column kind.

Jagged 2D grids raise ValueError (Calc ranges are rectangular).

Python vs Cython

Host flatten is an optimized pure-Python loop:

  • identity type checks (type(val) is float, val is None)
  • bound-method capture (buf_append = buf.append)
  • None as NaN on the fast path
  • lazy column-state upgrades
  • rectangular validation before the hot loop

The optional Cython module splitgrid.pack exposes fast_flatten_grid_1d / fast_flatten_grid_2d. It is loaded dynamically and canary-tested at import. If the extension is missing or fails the canary, the codec uses pure Python. Importing splitgrid never requires a compiler.

Install

pip install splitgrid

PyPI wheels include the compiled Cython flatten accelerator. From a source checkout (Cython is built if a compiler is available):

pip install .
pip install -e ".[test]"      # editable + pytest, hypothesis, deal, numpy
pip install -e ".[numpy]"     # child unpack/pack
pip install -e ".[verify]"    # crosshair-tool

Host pack stays NumPy-free. Child child_unpack_* / child_pack_* import NumPy locally.

Test

pytest                  # default: -m "not slow"
pytest -m "not slow"    # same
pytest -m slow          # CrossHair subprocess checks (optional)
make verify             # deal contracts + hypothesis round-trips, no CrossHair

Default pytest does not require the compiled extension. When splitgrid.pack is built, tests/test_cython_parity.py compares Cython and Python flatten components on the same grids.

Public API (WriterAgent-compatible)

from splitgrid import (
    BINARY_MIN_CELLS,
    host_pack_split_grid,
    host_unpack_split_grid,
    child_unpack_split_grid,
    child_pack_split_grid,
    host_pack_data,
    host_unpack_data,
    child_unpack_data,
    child_pack_result,
    is_split_grid,
    load_cython_accelerator,
    get_cython_status_info,
)

host_pack_data(..., force="auto"|"always"|"never") chooses split-grid vs nested list. host_pack_multi_data is a thin multi_data wrapper over the same per-grid packing.

How WriterAgent will consume this

In WriterAgent, replace from plugin.scripting.payload_codec import host_pack_data, ... with from splitgrid import host_pack_data, .... The envelope tag stays "split_grid", dtype "float64", integer-keyed strings, and column_kinds int/float/bool. Pickle Protocol 5 framing stays in WriterAgent’s ipc.py — this package is the codec only.

Releasing

Tags matching v* (for example v0.1.0) run .github/workflows/publish.yml: cibuildwheel + sdist, then trusted publishing to PyPI (GitHub environment pypi, no API token). The workflow file must already be on main before you push the tag.

License

GPL-3.0-or-later (same as WriterAgent).

Project links

Data verified by PyPI on Aug 25, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

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  • Released:
Newer release available (0.1.2)

1 maintainer

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Avatar for keithcu from gravatar.com keithcu

Credits

PyPI data
Data sourced directly from PyPI's database.

Author: Keith Cu

GitHub Statistics

Data verified by PyPI on Aug 25, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

GNU General Public License v3 or later (GPLv3+) (GPL-3.0-or-later)

Requires

Python >=3.11

Provides Extra

numpy test verify

Tags

serialization numpy spreadsheet split-grid cython

Classifiers

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0.1.2

21 files

0.1.1

21 files

This release

0.1.0 This release

21 files

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