polygon from string

fastkml/geometry.py

@@ -980,6 +980,55 @@ def etree_element(
             )
         return element
 
+    @classmethod
+    def _get_polygon_kwargs(
+        cls,
+        *,
+        ns: str,
+        element: Element,
+        strict: bool,
+    ) -> Dict[str, Any]:
+        outer_boundary = element.find(f"{ns}outerBoundaryIs")
+        if outer_boundary is None:
+            error = config.etree.tostring(  # type: ignore[attr-defined]
+                element,
+                encoding="UTF-8",
+            ).decode("UTF-8")
+            raise KMLParseError(f"Missing outerBoundaryIs in {error}")
+        outer_ring = outer_boundary.find(f"{ns}LinearRing")
+        if outer_ring is None:
+            error = config.etree.tostring(  # type: ignore[attr-defined]
+                element,
+                encoding="UTF-8",
+            ).decode("UTF-8")
+            raise KMLParseError(f"Missing LinearRing in {error}")
+        exterior = cls._get_geometry(ns=ns, element=outer_ring, strict=strict)
+        interiors = []
+        for inner_boundary in element.findall(f"{ns}innerBoundaryIs"):
+            inner_ring = inner_boundary.find(f"{ns}LinearRing")
+            if inner_ring is None:
+                error = config.etree.tostring(  # type: ignore[attr-defined]
+                    element,
+                    encoding="UTF-8",
+                ).decode("UTF-8")
+                raise KMLParseError(f"Missing LinearRing in {error}")
+            interiors.append(
+                cls._get_geometry(ns=ns, element=inner_ring, strict=strict)
+            )
+        return {"geometry": geo.Polygon.from_linear_rings(exterior, *interiors)}
+
+    @classmethod
+    def _get_kwargs(
+        cls,
+        *,
+        ns: str,
+        element: Element,
+        strict: bool,
+    ) -> Dict[str, Any]:
+        kwargs = super()._get_kwargs(ns=ns, element=element, strict=strict)
+        kwargs.update(cls._get_polygon_kwargs(ns=ns, element=element, strict=strict))
+        return kwargs
+
 
 class MultiGeometry(_Geometry):
     ...

tests/geometries/polygon_test.py

@@ -15,6 +15,8 @@
 # 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 
 """Test the geometry classes."""
+from typing import cast
+
 import pygeoif.geometry as geo
 
 from fastkml.geometry import Polygon
@@ -60,6 +62,45 @@ def test_exterior_interior(self):
             "0.900000,0.100000 0.100000,0.100000"
         ) in polygon.to_string()
 
+    def test_from_string_exterior_only(self):
+        """Test exterior only."""
+        doc = """<kml:Polygon xmlns:kml="http://www.opengis.net/kml/2.2">
+          <kml:outerBoundaryIs>
+            <kml:LinearRing>
+              <kml:coordinates>0.000000,0.000000 1.000000,0.000000 1.000000,1.000000
+              0.000000,0.000000</kml:coordinates>
+            </kml:LinearRing>
+          </kml:outerBoundaryIs>
+        </kml:Polygon>"""
+
+        polygon2 = cast(Polygon, Polygon.class_from_string(doc))
+
+        assert polygon2.geometry == geo.Polygon([(0, 0), (1, 0), (1, 1), (0, 0)])
+
+    def test_from_string_exterior_interior(self):
+        doc = """<kml:Polygon xmlns:kml="http://www.opengis.net/kml/2.2">
+          <kml:outerBoundaryIs>
+            <kml:LinearRing>
+              <kml:coordinates>-1.000000,-1.000000 2.000000,-1.000000 2.000000,2.000000
+              -1.000000,-1.000000</kml:coordinates>
+            </kml:LinearRing>
+          </kml:outerBoundaryIs>
+          <kml:innerBoundaryIs>
+            <kml:LinearRing>
+              <kml:coordinates>0.000000,0.000000 1.000000,0.000000 1.000000,1.000000
+              0.000000,0.000000</kml:coordinates>
+            </kml:LinearRing>
+          </kml:innerBoundaryIs>
+        </kml:Polygon>
+        """
+
+        polygon2 = cast(Polygon, Polygon.class_from_string(doc))
+
+        assert polygon2.geometry == geo.Polygon(
+            [(-1, -1), (2, -1), (2, 2), (-1, -1)],
+            [[(0, 0), (1, 0), (1, 1), (0, 0)]],
+        )
+
 
 class TestLxml(Lxml, TestStdLibrary):
     """Test with lxml."""