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"""Test vtkVariant support in VTK-Python
The following vtkVariant features have to be tested:
- Construction from various types
- Automatic arg conversion for methods with vtkVariant args
- Access of various types
- Operators < <= == > >=
- Use of vtkVariant as a dict key
The following features are not supported
- The ToNumeric method
Created on May 12, 2010 by David Gobbi
"""
import sys
import vtk
from vtk.test import Testing
if sys.hexversion >= 0x03000000:
cedilla = 'Fran\xe7ois'
else:
cedilla = unicode('Fran\xe7ois', 'latin1')
class TestVariant(Testing.vtkTest):
def testDefaultConstructor(self):
"""Default constructor"""
v = vtk.vtkVariant()
self.assertEqual(v.IsValid(), False)
self.assertEqual(v.GetType(), 0)
def testCopyConstructor(self):
"""Construct from another vtkVariant"""
u = vtk.vtkVariant('test')
v = vtk.vtkVariant(u)
self.assertEqual(v.GetType(), vtk.VTK_STRING)
self.assertEqual(v.ToString(), u.ToString())
def testIntConstructor(self):
"""Construct from int"""
v = vtk.vtkVariant(10)
self.assertEqual(v.GetType(), vtk.VTK_INT)
self.assertEqual(v.ToInt(), 10)
def testFloatConstructor(self):
"""Construct from float"""
v = vtk.vtkVariant(10.0)
self.assertEqual(v.GetType(), vtk.VTK_DOUBLE)
self.assertEqual(v.ToDouble(), 10.0)
def testStringConstructor(self):
"""Construct from string"""
v = vtk.vtkVariant('hello')
self.assertEqual(v.GetType(), vtk.VTK_STRING)
self.assertEqual(v.ToString(), 'hello')
def testBytesConstructor(self):
"""Construct from bytes"""
v = vtk.vtkVariant(b'hello')
self.assertEqual(v.GetType(), vtk.VTK_STRING)
self.assertEqual(v.ToString(), 'hello')
def testUnicodeConstructor(self):
"""Construct from unicode"""
v = vtk.vtkVariant(cedilla)
self.assertEqual(v.GetType(), vtk.VTK_UNICODE_STRING)
self.assertEqual(v.ToUnicodeString(), cedilla)
def testObjectConstructor(self):
"""Construct from VTK object"""
o = vtk.vtkIntArray()
v = vtk.vtkVariant(o)
self.assertEqual(v.GetType(), vtk.VTK_OBJECT)
self.assertEqual(v.GetTypeAsString(), o.GetClassName())
self.assertEqual(v.ToVTKObject(), o)
def testTwoArgConstructor(self):
"""Construct with a specific type"""
# construct with conversion to int
v = vtk.vtkVariant('10')
u = vtk.vtkVariant(v, vtk.VTK_INT)
self.assertEqual(u.GetType(), vtk.VTK_INT)
self.assertEqual(v.ToInt(), u.ToInt())
# construct with conversion to double
v = vtk.vtkVariant(10)
u = vtk.vtkVariant(v, vtk.VTK_DOUBLE)
self.assertEqual(u.GetType(), vtk.VTK_DOUBLE)
self.assertEqual(u.ToDouble(), 10.0)
# failed conversion to vtkObject
v = vtk.vtkVariant(10)
u = vtk.vtkVariant(v, vtk.VTK_OBJECT)
self.assertEqual(u.IsValid(), False)
def testAutomaticArgConversion(self):
"""Automatic construction of variants to resolve args"""
# use with one of vtkVariant's own constructors
v = vtk.vtkVariant('10', vtk.VTK_INT)
self.assertEqual(v.ToInt(), 10)
self.assertEqual(v.GetType(), vtk.VTK_INT)
# use with vtkVariantArray
a = vtk.vtkVariantArray()
i = a.InsertNextValue(10)
v = a.GetValue(i)
self.assertEqual(v.GetType(), vtk.VTK_INT)
self.assertEqual(v.ToInt(), 10)
i = a.InsertNextValue(10.0)
v = a.GetValue(i)
self.assertEqual(v.GetType(), vtk.VTK_DOUBLE)
self.assertEqual(v.ToDouble(), 10.0)
i = a.InsertNextValue('10')
v = a.GetValue(i)
self.assertEqual(v.GetType(), vtk.VTK_STRING)
self.assertEqual(v.ToString(), '10')
def testCompare(self):
"""Use comparison operators to sort a list of vtkVariants"""
original = [1, 2.5, vtk.vtkVariant(), "0", cedilla]
ordered = [vtk.vtkVariant(), "0", 1, 2.5, cedilla]
l = [vtk.vtkVariant(x) for x in original]
s = [vtk.vtkVariant(x) for x in ordered]
l.sort()
self.assertEqual(l, s)
def testComparisonMethods(self):
v1 = vtk.vtkVariant(10)
v2 = vtk.vtkVariant("10")
# compare without regards to type
self.assertEqual(vtk.vtkVariantEqual(v1, v2), True)
self.assertEqual(vtk.vtkVariantLessThan(v1, v2), False)
# compare with different types being non-equivalent
self.assertEqual(vtk.vtkVariantStrictEquality(v1, v2), False)
if sys.hexversion >= 0x03000000:
self.assertEqual(vtk.vtkVariantStrictWeakOrder(v1, v2), True)
else:
# for Python 2, it worked like the cmp() function
self.assertEqual(vtk.vtkVariantStrictWeakOrder(v1, v2), -1)
def testStrictWeakOrder(self):
"""Use vtkVariantStrictWeakOrder to sort a list of vtkVariants"""
original = [1, 2.5, vtk.vtkVariant(), "0", cedilla]
ordered = [vtk.vtkVariant(), 1, 2.5, "0", cedilla]
l = [vtk.vtkVariant(x) for x in original]
s = [vtk.vtkVariant(x) for x in ordered]
l.sort(key=vtk.vtkVariantStrictWeakOrderKey)
self.assertEqual(l, s)
def testVariantExtract(self):
"""Use vtkVariantExtract"""
l = [1, '2', cedilla, 4.0, vtk.vtkObject()]
s = [vtk.vtkVariant(x) for x in l]
m = [vtk.vtkVariantExtract(x) for x in s]
self.assertEqual(l, m)
def testHash(self):
"""Use a variant as a dict key"""
d = {}
# doubles, ints, srings, all hash as strings
d[vtk.vtkVariant(1.0)] = 'double'
d[vtk.vtkVariant(1)] = 'int'
self.assertEqual(d[vtk.vtkVariant('1')], 'int')
# strings and unicode have the same hash
d[vtk.vtkVariant('s').ToString()] = 'string'
d[vtk.vtkVariant('s').ToUnicodeString()] = 'unicode'
self.assertEqual(d[vtk.vtkVariant('s').ToString()], 'unicode')
# every vtkObject is hashed by memory address
o1 = vtk.vtkIntArray()
o2 = vtk.vtkIntArray()
d[vtk.vtkVariant(o1)] = 'vtkIntArray1'
d[vtk.vtkVariant(o2)] = 'vtkIntArray2'
self.assertEqual(d[vtk.vtkVariant(o1)], 'vtkIntArray1')
self.assertEqual(d[vtk.vtkVariant(o2)], 'vtkIntArray2')
# invalid variants all hash the same
d[vtk.vtkVariant()] = 'invalid'
self.assertEqual(d[vtk.vtkVariant()], 'invalid')
def testPassByValueReturnByReference(self):
"""Pass vtkVariant by value, return by reference"""
a = vtk.vtkVariantArray()
a.SetNumberOfValues(1)
v = vtk.vtkVariant(1)
a.SetValue(0, v)
u = a.GetValue(0)
self.assertEqual(u.ToInt(), v.ToInt())
self.assertEqual(u.GetType(), v.GetType())
self.assertEqual(u.IsValid(), v.IsValid())
def testPassByReferenceReturnByValue(self):
"""Pass vtkVariant by reference, return by value."""
a = vtk.vtkArray.CreateArray(1, vtk.VTK_INT)
a.Resize(1,1)
v = vtk.vtkVariant(1)
a.SetVariantValue(0, 0, v)
u = a.GetVariantValue(0, 0)
self.assertEqual(u.ToInt(), v.ToInt())
self.assertEqual(u.GetType(), v.GetType())
self.assertEqual(u.IsValid(), v.IsValid())
if __name__ == "__main__":
Testing.main([(TestVariant, 'test')])
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