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from __future__ import annotations
import msgspec
Position = tuple[float, float]
# Define the 7 standard Geometry types.
# All types set `tag=True`, meaning that they'll make use of a `type` field to
# disambiguate between types when decoding.
class Point(msgspec.Struct, tag=True):
coordinates: Position
class MultiPoint(msgspec.Struct, tag=True):
coordinates: list[Position]
class LineString(msgspec.Struct, tag=True):
coordinates: list[Position]
class MultiLineString(msgspec.Struct, tag=True):
coordinates: list[list[Position]]
class Polygon(msgspec.Struct, tag=True):
coordinates: list[list[Position]]
class MultiPolygon(msgspec.Struct, tag=True):
coordinates: list[list[list[Position]]]
class GeometryCollection(msgspec.Struct, tag=True):
geometries: list[Geometry]
Geometry = (
Point
| MultiPoint
| LineString
| MultiLineString
| Polygon
| MultiPolygon
| GeometryCollection
)
# Define the two Feature types
class Feature(msgspec.Struct, tag=True):
geometry: Geometry | None = None
properties: dict | None = None
id: str | int | None = None
class FeatureCollection(msgspec.Struct, tag=True):
features: list[Feature]
# A union of all 9 GeoJSON types
GeoJSON = Geometry | Feature | FeatureCollection
# Create a decoder and an encoder to use for decoding & encoding GeoJSON types
loads = msgspec.json.Decoder(GeoJSON).decode
dumps = msgspec.json.Encoder().encode
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