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These tests consist of various Python constructions (hopefully a somewhat comprehensive set) with specific timestamp annotations scattered throughout. When the tests are run using the Python 3 interpreter, these annotations are checked and compared to the "current timestamp" to see that they are in agreement. This is what makes the tests "self-validating". There are a few different kinds of annotations: the basic `t[4]` style (meaning this is executed at timestamp 4), the `t.dead[4]` variant (meaning this _would_ happen at timestamp 4, but it is in a dead branch), and `t.never` (meaning this is never executed at all). In addition to this, there is a query, MissingAnnotations, which checks whether we have applied these annotations maximally. Many expression nodes are not actually annotatable, so there is a sizeable list of excluded nodes for that query.
77 lines
1.7 KiB
Python
77 lines
1.7 KiB
Python
"""Short-circuit boolean operators and evaluation order."""
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from timer import test
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@test
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def test_and_both_sides(t):
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# True and X — both operands evaluated, result is X
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x = (True @ t[0] and 42 @ t[1]) @ t[2]
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@test
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def test_and_short_circuit(t):
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# False and ... — right side never evaluated
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x = (False @ t[0] and True @ t.dead[1]) @ t[1]
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@test
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def test_or_short_circuit(t):
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# True or ... — right side never evaluated
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x = (True @ t[0] or False @ t.dead[1]) @ t[1]
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@test
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def test_or_both_sides(t):
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# False or X — both operands evaluated, result is X
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x = (False @ t[0] or 42 @ t[1]) @ t[2]
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@test
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def test_not(t):
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# not evaluates its operand, then negates
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x = (not True @ t[0]) @ t[1]
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y = (not False @ t[2]) @ t[3]
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@test
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def test_chained_and(t):
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# 1 and 2 and 3 — all truthy, all evaluated left-to-right
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x = (1 @ t[0] and 2 @ t[1] and 3 @ t[2]) @ t[3]
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@test
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def test_chained_or(t):
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# 0 or "" or 42 — first two falsy, all evaluated until truthy found
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x = (0 @ t[0] or "" @ t[1] or 42 @ t[2]) @ t[3]
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@test
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def test_mixed_and_or(t):
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# True and False or 42 => (True and False) or 42 => False or 42 => 42
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x = ((True @ t[0] and False @ t[1]) @ t[2] or 42 @ t[3]) @ t[4]
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@test
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def test_and_side_effects(t):
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# Both functions called when left side is truthy
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def f():
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return 10 @ t[1]
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def g():
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return 20 @ t[4]
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x = ((f @ t[0])() @ t[2] and (g @ t[3])() @ t[5]) @ t[6]
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@test
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def test_or_side_effects(t):
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# Both functions called when left side is falsy
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def f():
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return 0 @ t[1]
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def g():
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return 20 @ t[4]
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x = ((f @ t[0])() @ t[2] or (g @ t[3])() @ t[5]) @ t[6]
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