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37 lines
930 B
37 lines
930 B
from sympy.strategies.branch.tools import canon
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from sympy.core.basic import Basic
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from sympy.core.numbers import Integer
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from sympy.core.singleton import S
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def posdec(x):
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if isinstance(x, Integer) and x > 0:
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yield x-1
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else:
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yield x
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def branch5(x):
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if isinstance(x, Integer):
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if 0 < x < 5:
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yield x-1
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elif 5 < x < 10:
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yield x+1
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elif x == 5:
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yield x+1
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yield x-1
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else:
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yield x
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def test_zero_ints():
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expr = Basic(S(2), Basic(S(5), S(3)), S(8))
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expected = {Basic(S(0), Basic(S(0), S(0)), S(0))}
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brl = canon(posdec)
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assert set(brl(expr)) == expected
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def test_split5():
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expr = Basic(S(2), Basic(S(5), S(3)), S(8))
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expected = {Basic(S(0), Basic(S(0), S(0)), S(10)),
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Basic(S(0), Basic(S(10), S(0)), S(10))}
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brl = canon(branch5)
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assert set(brl(expr)) == expected
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