laterite — a Rust-backed AGS4 reader, writer and validator

laterite

A Rust-backed AGS4 reader, writer and validator for Python.

A faster drop-in for python-ags4's AGS4 module (1.2.0 parity-pinned, 122/131 tests) — swap from python_ags4 import AGS4 for from laterite import compat as AGS4. The native API returns born-typed polars frames by default (or pandas with read(..., backend="pandas")) — both pyarrow-free, read back from a Python-owned in-memory DuckDB engine.

pip install laterite                  # base AGS4 (polars + duckdb, pyarrow-free)
pip install "laterite[compat]"        # + pandas (python-ags4 drop-in)

import laterite

result = laterite.validate("delivery.ags")
for rule, findings in result.by_rule().items():
    print(rule, len(findings))

# python-ags4 drop-in
from laterite import compat as AGS4
tables, _ = AGS4.AGS4_to_dataframe("delivery.ags")

# Or a typed view of the file
from laterite.ags4 import read_typed
proj = read_typed("delivery.ags")

The validator engine is clean-room from the AGS4 spec. python-ags4 is LGPL-3.0; the clean-room separation lets laterite ship under MIT.

Requires Python ≥ 3.12.

Full docs, parity catalogue and observations at https://github.com/niko86/laterite.

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