def run():
""" Starts the emulator. """
emulator = Interpreter()
while emulator.is_running:
user_input = Reader.read()
result = emulator.execute_pipeline(user_input)
if result:
print(result)
class TestInterpreter(unittest.TestCase):
def setUp(self):
self.emulator = Interpreter()
self.emulator._variables['a'] = '5'
self.emulator._variables['b'] = '6'
def testExecutePipeline_pipelineReturningResult(self):
self.assertEqual(
self.emulator.execute_pipeline('echo some text | echo more text'),
'more text')
self.assertEqual(
self.emulator.execute_pipeline('echo some text | grep some'),
'some text')
def testExecutePipeline_pipelineReturningNone(self):
self.assertEqual(self.emulator.execute_pipeline(''), None)
self.assertEqual(
self.emulator.execute_pipeline(
'echo some text | echo some more text | var=179'), None)
def testExecutePipeline_pipelineReturningException(self):
exception = self.emulator.execute_pipeline(
'echo worked | hello_kitty meow | exit')
self.assertEqual(str(exception), 'hello_kitty: command not found...')
def testExecutePipeline_pipelineWithAssignments(self):
self.assertEqual(
self.emulator.execute_pipeline('a=7 | c=d4 | echo $a$c$b'),
'7d46')
def testExecutePipeline_pipelineWithExit(self):
self.assertEqual(
self.emulator.execute_pipeline('echo 5 | cat|exit |echo 8'), None)
self.assertFalse(self.emulator.is_running)
def testExecuteCommand_commandExecution(self):
self.assertEqual(self.emulator._execute_command(['cat'], '5'), '5')
with self.assertRaises(CommandException) as raised:
self.emulator._execute_command(['hello_kitty', 'meow'], None)
self.assertEqual(str(raised.exception),
'hello_kitty: command not found...')
def testExecuteCommand_variableAssignment(self):
self.assertEqual(self.emulator._execute_command(['a=6'], None), None)
self.assertEqual(self.emulator._variables['a'], '6')
self.assertEqual(self.emulator._execute_command(['c=dog'], None), None)
self.assertEqual(self.emulator._variables['c'], 'dog')
def testIsAssignment_isAssignment(self):
self.assertTrue(self.emulator._is_assignment(['a=6']))
self.assertTrue(self.emulator._is_assignment(['a=a=a']))
self.assertTrue(self.emulator._is_assignment(['c_w=d1og']))
def testIsAssignment_isNotAssignment(self):
self.assertFalse(self.emulator._is_assignment(['']))
self.assertFalse(self.emulator._is_assignment(['a=6', 'b=7']))
self.assertFalse(self.emulator._is_assignment(['q`w=2']))
def testIsExit_isExit(self):
self.assertTrue(self.emulator._is_exit(['exit']))
self.assertTrue(self.emulator._is_exit(['exit', '0', '1']))
def testIsExit_isNotExit(self):
self.assertFalse(self.emulator._is_exit(['ext']))
self.assertFalse(self.emulator._is_exit(['0', 'exit', '1']))
self.assertFalse(self.emulator._is_exit([]))