Support LinearRing objects in the shape() function (#1192)

shapely/geometry/geo.py

@@ -8,7 +8,7 @@
 
 from .point import Point, asPoint
 from .linestring import LineString, asLineString
-from .polygon import Polygon, asPolygon
+from .polygon import LinearRing, Polygon, asPolygon
 from .multipoint import MultiPoint, asMultiPoint
 from .multilinestring import MultiLineString, asMultiLineString
 from .multipolygon import MultiPolygon, MultiPolygonAdapter
@@ -106,6 +106,8 @@ def shape(context):
         return Point(ob["coordinates"])
     elif geom_type == "linestring":
         return LineString(ob["coordinates"])
+    elif geom_type == "linearring":
+        return LinearRing(ob["coordinates"])
     elif geom_type == "polygon":
         return Polygon(ob["coordinates"][0], ob["coordinates"][1:])
     elif geom_type == "multipoint":

tests/test_geointerface.py

@@ -6,7 +6,7 @@
 from shapely.geometry.multipoint import MultiPoint, MultiPointAdapter
 from shapely.geometry.linestring import LineString, LineStringAdapter
 from shapely.geometry.multilinestring import MultiLineString, MultiLineStringAdapter
-from shapely.geometry.polygon import Polygon, PolygonAdapter
+from shapely.geometry.polygon import LinearRing, Polygon, PolygonAdapter
 from shapely.geometry.multipolygon import MultiPolygon, MultiPolygonAdapter
 from shapely import wkt
 
@@ -94,6 +94,17 @@ def test_geointerface(self):
         self.assertIsInstance(geom, LineString)
         self.assertEqual(tuple(geom.coords), ((-1.0, -1.0), (1.0, 1.0)))
 
+        # Check linearring
+        geom = shape(
+            {'type': 'LinearRing', 
+             'coordinates': 
+                 ((0.0, 0.0), (0.0, 1.0), (1.0, 1.0), (2.0, -1.0), (0.0, 0.0))}
+        )
+        self.assertIsInstance(geom, LinearRing)
+        self.assertEqual(
+            tuple(geom.coords),
+            ((0.0, 0.0), (0.0, 1.0), (1.0, 1.0), (2.0, -1.0), (0.0, 0.0)))
+
         # polygon
         geom = shape(
             {'type': 'Polygon',