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goto_tests_3_11.py
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import unittest
from goto import goto
from goto import DuplicateLabelError, GotoNotWithinLabelBlock, GotoNestedTooDeeply, MissingLabelError
class MyTestCase(unittest.TestCase):
def test_simple_forward(self):
@goto
def simple_forward():
a = 5
goto .done
a = 7
label .done
self.assertEqual(5, a)
# import dis
# dis.dis(simple_forward)
simple_forward()
def test_simple_upper(self):
@goto
def simple_upper():
a=5
lAbEL. foo
if a == 7:
return a
a = 7
GOTO .foo
self.assertEqual(7, simple_upper())
def test_two_gotos(self):
@goto
def two_gotos(n):
if n == 1:
goto .done
n = 5
goto .done
n = 2
label .done
return n
self.assertEqual(1, two_gotos(1))
self.assertEqual(5, two_gotos(99))
def test_two_labels(self):
got_exception = False
try:
@goto
def two_labels():
goto .done
label .done
label .done
except DuplicateLabelError:
got_exception = True
self.assertTrue(got_exception)
def test_not_in_label_block(self):
got_exception = False
try:
@goto
def not_in_label_block():
goto .here
for i in (1,2):
label .here
except GotoNotWithinLabelBlock:
got_exception = True
self.assertTrue(got_exception)
def test_pop_iter_in_loop(self):
@goto
def pop_iter_in_loop():
count = 0
label.repeat
count += 1
if count == 5000: # will probably crash if POP_TOPs aren't accurate
return True
for x in [1]:
if x == 1:
goto.repeat
return False
pop_iter_in_loop()
def test_deep_nest(self):
@goto
def deep_nest():
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
goto.here
if __name__: return False
label .here
return True
self.assertTrue(deep_nest())
def test_too_deep_nest(self):
got_exception = False
try:
@goto
def deep_nest():
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
for _ in [1]:
goto .here
if __name__: return False
label .here
return True
except GotoNestedTooDeeply:
got_exception = True
self.assertTrue(got_exception)
def test_not_in_same_block(self):
got_exception = False
try:
@goto
def not_in_same_block():
for _ in [1]:
for _ in [1]:
goto .here
for _ in [1]:
label .here
except GotoNotWithinLabelBlock:
got_exception = True
self.assertTrue(got_exception)
def test_goto_missing_label(self):
got_exception = False
try:
@goto
def goto_missing_label():
goto .there
label .here
except MissingLabelError:
got_exception = True
self.assertTrue(got_exception)
def test_unreachable_code_suggestion(self):
got_exception = False
try:
@goto
def goto_unreachable_code():
goto .after_return
return 5
label .after_return # Python will remove 'unreachable' code
return 10
except MissingLabelError:
got_exception = True
self.assertTrue(got_exception)
def test_example(self):
@goto
def matrix_find(matrix, n):
for square in matrix:
for line in square:
for value in line:
if value == n:
rval = "found"
goto .found
rval = "not found"
label .found
# ... other code here ...
return rval
val = matrix_find([[[1,2]],[[3,4]]], 3)
self.assertEqual("found", val)
def test_ext_arg_back(self):
@goto
def ext_arg_back():
def z():
pass
n = 0
j = 0
label .start # 1 instruction (the last NOP)
n += 1 # 5 instructions
dir(z) # 15 instructions each that do nothing
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
# 156 instructions past label 12+5+10*15
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
# 231 ins. past label
# code before goto is 21 instructions
if n == 2:
return n # Here if we jumped back to the start label
j += 1
if j == 2:
return n # Probably here if we jumped back short of the start label
# 252 ins. past label
pass # 253 +1 instruction
pass # 254
pass # 255
# 256 (+ 1 because we jump after the label.)
goto .start # we will actually jump back 257 because +1 for the extended arg before the jump.
return -1 # Shouldn't ever get here
# import dis
# dis.dis(ext_arg_back)
self.assertEqual(2, ext_arg_back())
def test_no_ext_arg_back(self):
@goto
def no_ext_arg_back():
def z():
pass
n = 0
j = 0
label.start # 1 instruction (the last NOP)
n += 1 # 5 instructions
dir(z) # 15 instructions each that do nothing
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
# 156 instructions past label 12+5+10*15
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
# 231 ins. past label
# code before goto is 21 instructions
if n == 2:
return n # Here if we jumped back to the start label
j += 1
if j == 2:
return n # Probably here if we jumped back short of the start label
# 252 ins. past label
pass # 253 +1 instruction
pass # 254
# 255 (+ 1 because we jump after the label.)
goto.start
return -1 # Shouldn't ever get here
# import dis
# dis.dis(no_ext_arg_back)
self.assertEqual(2, no_ext_arg_back())
def test_ext_arg_forward(self):
@goto
def ext_arg_forward():
goto .end
def z():
pass
dir(z) # + 15 instruction each
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
dir(z)
if __name__: return False
label.end
return True
self.assertTrue(ext_arg_forward())
if __name__ == '__main__':
unittest.main()