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venv/Lib/site-packages/django/contrib/gis/forms/fields.py

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+from django import forms
+from django.contrib.gis.gdal import GDALException
+from django.contrib.gis.geos import GEOSException, GEOSGeometry
+from django.core.exceptions import ValidationError
+from django.utils.translation import gettext_lazy as _
+
+from .widgets import OpenLayersWidget
+
+
+class GeometryField(forms.Field):
+    """
+    This is the basic form field for a Geometry.  Any textual input that is
+    accepted by GEOSGeometry is accepted by this form.  By default,
+    this includes WKT, HEXEWKB, WKB (in a buffer), and GeoJSON.
+    """
+    widget = OpenLayersWidget
+    geom_type = 'GEOMETRY'
+
+    default_error_messages = {
+        'required': _('No geometry value provided.'),
+        'invalid_geom': _('Invalid geometry value.'),
+        'invalid_geom_type': _('Invalid geometry type.'),
+        'transform_error': _('An error occurred when transforming the geometry '
+                             'to the SRID of the geometry form field.'),
+    }
+
+    def __init__(self, *, srid=None, geom_type=None, **kwargs):
+        self.srid = srid
+        if geom_type is not None:
+            self.geom_type = geom_type
+        super().__init__(**kwargs)
+        self.widget.attrs['geom_type'] = self.geom_type
+
+    def to_python(self, value):
+        """Transform the value to a Geometry object."""
+        if value in self.empty_values:
+            return None
+
+        if not isinstance(value, GEOSGeometry):
+            if hasattr(self.widget, 'deserialize'):
+                try:
+                    value = self.widget.deserialize(value)
+                except GDALException:
+                    value = None
+            else:
+                try:
+                    value = GEOSGeometry(value)
+                except (GEOSException, ValueError, TypeError):
+                    value = None
+            if value is None:
+                raise ValidationError(self.error_messages['invalid_geom'], code='invalid_geom')
+
+        # Try to set the srid
+        if not value.srid:
+            try:
+                value.srid = self.widget.map_srid
+            except AttributeError:
+                if self.srid:
+                    value.srid = self.srid
+        return value
+
+    def clean(self, value):
+        """
+        Validate that the input value can be converted to a Geometry object
+        and return it. Raise a ValidationError if the value cannot be
+        instantiated as a Geometry.
+        """
+        geom = super().clean(value)
+        if geom is None:
+            return geom
+
+        # Ensuring that the geometry is of the correct type (indicated
+        # using the OGC string label).
+        if str(geom.geom_type).upper() != self.geom_type and self.geom_type != 'GEOMETRY':
+            raise ValidationError(self.error_messages['invalid_geom_type'], code='invalid_geom_type')
+
+        # Transforming the geometry if the SRID was set.
+        if self.srid and self.srid != -1 and self.srid != geom.srid:
+            try:
+                geom.transform(self.srid)
+            except GEOSException:
+                raise ValidationError(
+                    self.error_messages['transform_error'], code='transform_error')
+
+        return geom
+
+    def has_changed(self, initial, data):
+        """ Compare geographic value of data with its initial value. """
+
+        try:
+            data = self.to_python(data)
+            initial = self.to_python(initial)
+        except ValidationError:
+            return True
+
+        # Only do a geographic comparison if both values are available
+        if initial and data:
+            data.transform(initial.srid)
+            # If the initial value was not added by the browser, the geometry
+            # provided may be slightly different, the first time it is saved.
+            # The comparison is done with a very low tolerance.
+            return not initial.equals_exact(data, tolerance=0.000001)
+        else:
+            # Check for change of state of existence
+            return bool(initial) != bool(data)
+
+
+class GeometryCollectionField(GeometryField):
+    geom_type = 'GEOMETRYCOLLECTION'
+
+
+class PointField(GeometryField):
+    geom_type = 'POINT'
+
+
+class MultiPointField(GeometryField):
+    geom_type = 'MULTIPOINT'
+
+
+class LineStringField(GeometryField):
+    geom_type = 'LINESTRING'
+
+
+class MultiLineStringField(GeometryField):
+    geom_type = 'MULTILINESTRING'
+
+
+class PolygonField(GeometryField):
+    geom_type = 'POLYGON'
+
+
+class MultiPolygonField(GeometryField):
+    geom_type = 'MULTIPOLYGON'