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2c2f5aee4d
Thanks to Chris Beaven for the initial patch, Fredrik Lundh for the basis of the parser methodology and Russell Keith-Magee for code reviews. There are some BACKWARDS INCOMPATIBILITIES in rare cases - in particular, if you were using the keywords 'and', 'or' or 'not' as variable names within the 'if' expression, which was previously allowed in some cases. git-svn-id: http://code.djangoproject.com/svn/django/trunk@11806 bcc190cf-cafb-0310-a4f2-bffc1f526a37
47 lines
1.8 KiB
Python
47 lines
1.8 KiB
Python
import unittest
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from django.template.smartif import IfParser, Literal
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class SmartIfTests(unittest.TestCase):
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def assertCalcEqual(self, expected, tokens):
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self.assertEqual(expected, IfParser(tokens).parse().eval({}))
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# We only test things here that are difficult to test elsewhere
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# Many other tests are found in the main tests for builtin template tags
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# Test parsing via the printed parse tree
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def test_not(self):
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var = IfParser(["not", False]).parse()
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self.assertEqual("(not (literal False))", repr(var))
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self.assert_(var.eval({}))
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self.assertFalse(IfParser(["not", True]).parse().eval({}))
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def test_or(self):
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var = IfParser([True, "or", False]).parse()
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self.assertEqual("(or (literal True) (literal False))", repr(var))
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self.assert_(var.eval({}))
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def test_in(self):
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list_ = [1,2,3]
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self.assertCalcEqual(True, [1, 'in', list_])
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self.assertCalcEqual(False, [1, 'in', None])
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self.assertCalcEqual(False, [None, 'in', list_])
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def test_precedence(self):
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# (False and False) or True == True <- we want this one, like Python
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# False and (False or True) == False
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self.assertCalcEqual(True, [False, 'and', False, 'or', True])
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# True or (False and False) == True <- we want this one, like Python
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# (True or False) and False == False
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self.assertCalcEqual(True, [True, 'or', False, 'and', False])
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# (1 or 1) == 2 -> False
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# 1 or (1 == 2) -> True <- we want this one
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self.assertCalcEqual(True, [1, 'or', 1, '==', 2])
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self.assertCalcEqual(True, [True, '==', True, 'or', True, '==', False])
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self.assertEqual("(or (and (== (literal 1) (literal 2)) (literal 3)) (literal 4))",
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repr(IfParser([1, '==', 2, 'and', 3, 'or', 4]).parse()))
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