Crate kenro 

kenro

SpatiaLite-style spatial SQL for SQLite in pure Rust — PostGIS-compatible ST_ functions that work with rusqlite, as a loadable extension, and in WASM.

kenro is a spatial SQL engine for SQLite in pure Rust, with zero C dependencies: WKB/WKT/GeoPackage-blob I/O, the DE-9IM predicate family, pure-Rust overlay/repair/buffer, SQL aggregates (ST_Union, ST_AsMVT), and the helper functions the GeoPackage spatial index triggers require — so a plain SQLite build can maintain a GeoPackage spatial index correctly.

Function names and signatures follow PostGIS (SQL/MM ST_ prefix); PostGIS is the declared reference for semantics. Where kenro differs, it errs loudly — never silently.

let conn = rusqlite::Connection::open("parks.gpkg")?;
kenro::register(&conn)?;
let wkt: String = conn.query_row(
    "SELECT ST_AsText(ST_GeomFromGPB(geom)) FROM parks LIMIT 1",
    [],
    |r| r.get(0),
)?;

All functions are pure (no I/O, no clock, no randomness): identical input always produces identical output.

Re-exports

pub use error::Error;

pub use error::Result;

pub use geom::Geom;

Modules

coords

Coordinate rewriting at the encoding level.

crs

Coordinate reference systems: a built-in EPSG → proj4-string table and the proj4rs-backed geometry transform.

error

functions

Pure counterparts of the SQL functions. No SQLite types appear anywhere in this module tree: every function takes &[u8] / &str / scalars and returns Result — the binding layers (rusqlite, and later the loadable extension and WASM) are thin value-mapping shims over these.

geom

The internal geometry hub: everything decodes into Geom, all algorithms run on it, all encoders consume it.

gpb

GeoPackage geometry blob (GPB) header codec.

mvt

Hand-rolled Mapbox Vector Tile encoder (spec 2.1, layer version 2).