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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):
with self.subTest(geom=geom):
self.assertEqual(ref, geom)
# Should only accept string objects.
bad_input = (1, 5.23, None, False, memoryview(b"foo"))
msg = "'wkt' must be bytes or str (got {} instead)."
for bad_wkt in bad_input:
with (
self.subTest(bad_wkt=bad_wkt),
self.assertRaisesMessage(TypeError, msg.format(bad_wkt)),
):
wkt_r.read(bad_wkt)
def test02_wktwriter(self):
# Creating a WKTWriter instance, testing its ptr property.
wkt_w = WKTWriter()
msg = "Incompatible pointer type: "
with self.assertRaisesMessage(TypeError, msg):
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 (5.346 23 1.5)"
self.assertEqual(ref_wkt, wkt_w.write(ref).decode())
def test03_wkbreader(self):
# Creating a WKBReader instance
wkb_r = WKBReader()
hex_bin = b"000000000140140000000000004037000000000000"
hex_str = "000000000140140000000000004037000000000000"
wkb = memoryview(binascii.a2b_hex(hex_bin))
ref = GEOSGeometry(hex_bin)
# read() should return a GEOSGeometry on either a hex string or
# a WKB buffer.
g1 = wkb_r.read(wkb)
g2 = wkb_r.read(hex_bin)
g3 = wkb_r.read(hex_str)
for geom in (g1, g2, g3):
with self.subTest(geom=geom):
self.assertEqual(ref, geom)
bad_input = (1, 5.23, None, False)
msg = "'wkb' must be bytes, str or memoryview (got {} instead)."
for bad_wkb in bad_input:
with (
self.subTest(bad_wkb=bad_wkb),
self.assertRaisesMessage(TypeError, msg.format(bad_wkb)),
):
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.
msg = "Byte order parameter must be 0 (Big Endian) or 1 (Little Endian)."
for bad_byteorder in (-1, 2, 523, "foo", None):
# Equivalent of `wkb_w.byteorder = bad_byteorder`
with (
self.subTest(bad_byteorder=bad_byteorder),
self.assertRaisesMessage(ValueError, msg),
):
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
msg = "WKB output dimension must be 2 or 3"
for bad_outdim in (-1, 0, 1, 4, 423, "foo", None):
with (
self.subTest(bad_outdim=bad_outdim),
self.assertRaisesMessage(ValueError, msg),
):
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(1.0 / 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(1.0 / 3, 2.0 / 3)),
b"POINT (0.3333333333333333 0.6666666666666666)",
)
wkt_w.precision = 1
self.assertEqual(wkt_w.precision, 1)
self.assertEqual(wkt_w.write(Point(1.0 / 3, 2.0 / 3)), b"POINT (0.3 0.7)")
wkt_w.precision = 0
self.assertEqual(wkt_w.precision, 0)
self.assertEqual(wkt_w.write(Point(1.0 / 3, 2.0 / 3)), b"POINT (0 1)")
wkt_w.precision = None
self.assertIsNone(wkt_w.precision)
self.assertEqual(
wkt_w.write(Point(1.0 / 3, 2.0 / 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
with self.subTest(byteorder=byteorder, hexes=hexes):
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
)
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