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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, HintSequence
id = 207
group = 'introduction'
number = 12
visible = True
solution = '''\
import time
from ev3dev import *
from mindstorms_widgets import mindstorms_widgets
robot = mindstorms_widgets()
robot.connect_motor( 'left' )
robot.connect_motor( 'right' )
robot.connect_sensor( 'color' )
start = time.time()
while time.time()-start < 10:
if robot.color_sensor_measure('reflected_light_intensity') < 30:
L, R = 0, 20
else:
L, R = 20, 0
robot.move_tank( 'on', lr_power=[L,R])
robot.move_tank( 'off' )
'''
hint_type = {
'mW_init': Hint('mW_init'),
'connectMotorLeft': Hint('connectMotorLeft'),
'connectMotorRight': Hint('connectMotorRight'),
'moveTankOn': Hint('moveTankOn'),
'lrPower': Hint('lr_power'),
'moveTankOff': Hint('moveTankOff'),
'connectColorSensor': Hint('connectColorSensor'),
'colorSensorMeasureRLI': Hint('colorSensorMeasureRLI'),
'while': Hint('while'),
'time': Hint('time'),
'if': Hint('if')
}
def hint( code):
tokens = get_tokens(code)
# 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 'color' in code):
return [{'id': 'connectColorSensor'}]
if not (has_token_sequence(tokens, ['move_steering', '(']) and 'on' in code):
return [{'id': 'moveTankOn'}]
if not 'lr_power' in code:
return [{'id': 'lrPower'}]
if not (has_token_sequence(tokens, ['move_steering', '(']) and 'off' in code):
return [{'id': 'moveTankOff'}]
if not (has_token_sequence(tokens, ['color_sensor_measure', '(']) and 'reflected_light_intensity' in code):
return [{'id': 'colorSensorMeasureRLI'}]
if not has_token_sequence(tokens, ['while']):
return [{'id': 'while'}]
if not has_token_sequence(tokens, ['time']):
return [{'id': 'time'}]
if not has_token_sequence(tokens, ['if']):
return [{'id': 'if'}]
return None
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