1 files changed, 79 insertions, 0 deletions
diff --git a/robot/problems/introduction/countlines/common.py b/robot/problems/introduction/countlines/common.py
new file mode 100644
index 0000000..29f5383
--- /dev/null
+++ b/robot/problems/introduction/countlines/common.py
@@ -0,0 +1,79 @@
+# 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 = 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