import binascii from django.contrib.gis.geos import ( GEOSGeometry, Point, Polygon, WKBReader, WKBWriter, WKTReader, WKTWriter, ) from django.test import SimpleTestCase class GEOSIOTest(SimpleTestCase): def test01_wktreader(self): # Creating a WKTReader instance wkt_r = WKTReader() wkt = 'POINT (5 23)' # read() should return a GEOSGeometry ref = GEOSGeometry(wkt) g1 = wkt_r.read(wkt.encode()) g2 = wkt_r.read(wkt) for geom in (g1, g2): self.assertEqual(ref, geom) # Should only accept string objects. with self.assertRaises(TypeError): wkt_r.read(1) with self.assertRaises(TypeError): wkt_r.read(memoryview(b'foo')) def test02_wktwriter(self): # Creating a WKTWriter instance, testing its ptr property. wkt_w = WKTWriter() with self.assertRaises(TypeError): wkt_w.ptr = WKTReader.ptr_type() ref = GEOSGeometry('POINT (5 23)') ref_wkt = 'POINT (5.0000000000000000 23.0000000000000000)' self.assertEqual(ref_wkt, wkt_w.write(ref).decode()) def test_wktwriter_constructor_arguments(self): wkt_w = WKTWriter(dim=3, trim=True, precision=3) ref = GEOSGeometry('POINT (5.34562 23 1.5)') ref_wkt = 'POINT Z (5.35 23 1.5)' self.assertEqual(ref_wkt, wkt_w.write(ref).decode()) def test03_wkbreader(self): # Creating a WKBReader instance wkb_r = WKBReader() hex = b'000000000140140000000000004037000000000000' wkb = memoryview(binascii.a2b_hex(hex)) ref = GEOSGeometry(hex) # read() should return a GEOSGeometry on either a hex string or # a WKB buffer. g1 = wkb_r.read(wkb) g2 = wkb_r.read(hex) for geom in (g1, g2): self.assertEqual(ref, geom) bad_input = (1, 5.23, None, False) for bad_wkb in bad_input: with self.assertRaises(TypeError): wkb_r.read(bad_wkb) def test04_wkbwriter(self): wkb_w = WKBWriter() # Representations of 'POINT (5 23)' in hex -- one normal and # the other with the byte order changed. g = GEOSGeometry('POINT (5 23)') hex1 = b'010100000000000000000014400000000000003740' wkb1 = memoryview(binascii.a2b_hex(hex1)) hex2 = b'000000000140140000000000004037000000000000' wkb2 = memoryview(binascii.a2b_hex(hex2)) self.assertEqual(hex1, wkb_w.write_hex(g)) self.assertEqual(wkb1, wkb_w.write(g)) # Ensuring bad byteorders are not accepted. for bad_byteorder in (-1, 2, 523, 'foo', None): # Equivalent of `wkb_w.byteorder = bad_byteorder` with self.assertRaises(ValueError): wkb_w._set_byteorder(bad_byteorder) # Setting the byteorder to 0 (for Big Endian) wkb_w.byteorder = 0 self.assertEqual(hex2, wkb_w.write_hex(g)) self.assertEqual(wkb2, wkb_w.write(g)) # Back to Little Endian wkb_w.byteorder = 1 # Now, trying out the 3D and SRID flags. g = GEOSGeometry('POINT (5 23 17)') g.srid = 4326 hex3d = b'0101000080000000000000144000000000000037400000000000003140' wkb3d = memoryview(binascii.a2b_hex(hex3d)) hex3d_srid = b'01010000A0E6100000000000000000144000000000000037400000000000003140' wkb3d_srid = memoryview(binascii.a2b_hex(hex3d_srid)) # Ensuring bad output dimensions are not accepted for bad_outdim in (-1, 0, 1, 4, 423, 'foo', None): with self.assertRaisesMessage(ValueError, 'WKB output dimension must be 2 or 3'): wkb_w.outdim = bad_outdim # Now setting the output dimensions to be 3 wkb_w.outdim = 3 self.assertEqual(hex3d, wkb_w.write_hex(g)) self.assertEqual(wkb3d, wkb_w.write(g)) # Telling the WKBWriter to include the srid in the representation. wkb_w.srid = True self.assertEqual(hex3d_srid, wkb_w.write_hex(g)) self.assertEqual(wkb3d_srid, wkb_w.write(g)) def test_wkt_writer_trim(self): wkt_w = WKTWriter() self.assertFalse(wkt_w.trim) self.assertEqual(wkt_w.write(Point(1, 1)), b'POINT (1.0000000000000000 1.0000000000000000)') wkt_w.trim = True self.assertTrue(wkt_w.trim) self.assertEqual(wkt_w.write(Point(1, 1)), b'POINT (1 1)') self.assertEqual(wkt_w.write(Point(1.1, 1)), b'POINT (1.1 1)') self.assertEqual(wkt_w.write(Point(1. / 3, 1)), b'POINT (0.3333333333333333 1)') wkt_w.trim = False self.assertFalse(wkt_w.trim) self.assertEqual(wkt_w.write(Point(1, 1)), b'POINT (1.0000000000000000 1.0000000000000000)') def test_wkt_writer_precision(self): wkt_w = WKTWriter() self.assertIsNone(wkt_w.precision) self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0.3333333333333333 0.6666666666666666)') wkt_w.precision = 1 self.assertEqual(wkt_w.precision, 1) self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0.3 0.7)') wkt_w.precision = 0 self.assertEqual(wkt_w.precision, 0) self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0 1)') wkt_w.precision = None self.assertIsNone(wkt_w.precision) self.assertEqual(wkt_w.write(Point(1. / 3, 2. / 3)), b'POINT (0.3333333333333333 0.6666666666666666)') with self.assertRaisesMessage(AttributeError, 'WKT output rounding precision must be '): wkt_w.precision = 'potato' def test_empty_point_wkb(self): p = Point(srid=4326) wkb_w = WKBWriter() wkb_w.srid = False with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'): wkb_w.write(p) with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'): wkb_w.write_hex(p) wkb_w.srid = True for byteorder, hex in enumerate([ b'0020000001000010E67FF80000000000007FF8000000000000', b'0101000020E6100000000000000000F87F000000000000F87F', ]): wkb_w.byteorder = byteorder self.assertEqual(wkb_w.write_hex(p), hex) self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p) self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex))) self.assertEqual(GEOSGeometry(wkb_w.write(p)), p) def test_empty_polygon_wkb(self): p = Polygon(srid=4326) p_no_srid = Polygon() wkb_w = WKBWriter() wkb_w.srid = True for byteorder, hexes in enumerate([ (b'000000000300000000', b'0020000003000010E600000000'), (b'010300000000000000', b'0103000020E610000000000000'), ]): wkb_w.byteorder = byteorder for srid, hex in enumerate(hexes): wkb_w.srid = srid self.assertEqual(wkb_w.write_hex(p), hex) self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p if srid else p_no_srid) self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex))) self.assertEqual(GEOSGeometry(wkb_w.write(p)), p if srid else p_no_srid)