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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 = 206
group = 'introduction'
number = 10
visible = True
solution = '''\
import time
from ev3dev import *
from mindstorms_widgets import mindstorms_widgets
color_table = ['none', 'black', 'blue', 'green', 'yellow', 'red', 'white', 'brown']
robot = mindstorms_widgets()
robot.connect_motor( 'left' )
robot.connect_motor( 'right' )
robot.connect_sensor( 'color' )
robot.move_steering( 'on' )
start = time.time()
stevec = 0
color = -1
while time.time()-start < 2.1:
c = robot.color_sensor_measure( 'color' ) # values: 0-7 see the scale above
if c!=color:
if c!=6 and c!=0:
stevec += 1
color = c
robot.move_steering( 'off' )
print( "Stevilo crt:", stevec )
'''
hint_type = {
'mW_init': Hint('mW_init'),
'connectMotorLeft': Hint('connectMotorLeft'),
'connectMotorRight': Hint('connectMotorRight'),
'moveSteeringOn': Hint('moveSteeringOn'),
'moveSteeringOff': Hint('moveSteeringOff'),
'connectColorSensor': Hint('connectColorSensor'),
'colorSensorMeasure': Hint('colorSensorMeasure'),
'while': Hint('while')
}
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': 'moveSteeringOn'}]
if not (has_token_sequence(tokens, ['move_steering', '(']) and 'off' in code):
return [{'id': 'moveSteeringOff'}]
if not (has_token_sequence(tokens, ['color_sensor_measure', '(']) and 'color' in code):
return [{'id': 'colorSensorMeasure'}]
if not has_token_sequence(tokens, ['while']):
return [{'id': 'while'}]
return None
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