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# coding=utf-8
from python.util import has_token_sequence, string_almost_equal, \
string_contains_number, get_tokens, get_numbers, get_exception_desc
from server.hints import Hint
id = 215
group = 'introduction'
number = 6
visible = True
solution = '''\
robot = mindstorms_widgets()
robot.connect_motor( 'left' )
robot.connect_motor( 'right' )
robot.connect_sensor( 'ultrasonic' )
robot.move_steering( 'on', power=80 )
while robot.ultrasonic_sensor_measure( 'distance-cm' ) > 500:
pass
robot.move_steering( 'on', power=20 )
while robot.ultrasonic_sensor_measure( 'distance-cm' ) > 200:
pass
robot.move_steering( 'off' )
'''
hint_type = {
'mW_init': Hint('mW_init'),
'connectMotorLeft': Hint('connectMotorLeft'),
'connectMotorRight': Hint('connectMotorRight'),
'moveSteeringOn': Hint('moveSteeringOn'),
'moveSteeringOff': Hint('moveSteeringOff'),
'connectUltrasonicSensor': Hint('connectUltrasonicSensor'),
'ultrasonicSensorMeasure': Hint('ultrasonicSensorMeasure'),
'power80': Hint('power80'),
'power20': Hint('power20'),
'while': Hint('while')
}
def hint( code ):
tokens = get_tokens(code)
lines = code.split('\n')
# if code does not include mindstorms_widgets(), a student gets a hint that the robot should be somehow represented in the program
if not has_token_sequence(tokens, ['mindstorms_widgets', '(',')']):
return [{'id': 'mW_init'}]
# if code does not include connect_motor statement, a student needs to learn about how to connect the motors
if not has_token_sequence(tokens, ['connect_motor']) and not has_token_sequence(tokens, ['left']):
return [{'id': 'connectMotorLeft'}]
# if code does not include connect_motor statement, a student needs to learn about how to connect the motors
if not has_token_sequence(tokens, ['connect_motor']) and not has_token_sequence(tokens, ['right']):
return [{'id': 'connectMotorRight'}]
if not (has_token_sequence(tokens, ['connect_sensor', '(']) and 'ultrasonic' in code) :
return [{'id': 'connectUltrasonicSensor'}]
if not (has_token_sequence(tokens, ['move_steering', '(']) and 'on' in code):
return [{'id': 'moveSteeringOn'}]
if not (has_token_sequence(tokens, ['move_steering', '(']) and 'off' in code):
return [{'id': 'moveSteeringOff'}]
#if not (has_token_sequence(tokens, ['ultrasonic_sensor_measure', '(']) and 'distance-cm' in code):
if not any(('ultrasonic_sensor_measure' in s and '(' in s and 'distance-cm' in s) for s in lines):
return [{'id': 'ultrasonicSensorMeasure'}]
if not any(('power' in s and '80' in s and '=' in s) for s in lines):
return [{'id': 'power80'}]
if not any(('power' in s and '20' in s and '=' in s) for s in lines):
return [{'id': 'power20'}]
if not has_token_sequence(tokens, ['while']):
return [{'id': 'while'}]
return None
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