1 files changed, 85 insertions, 0 deletions
diff --git a/robot/problems/introduction/followline/common.py~ b/robot/problems/introduction/followline/common.py~
new file mode 100644
index 0000000..5a3db5b
--- /dev/null
+++ b/robot/problems/introduction/followline/common.py~
@@ -0,0 +1,85 @@
+# 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', '(', 'color', ')' ]):
+        return [{'id': 'connectColorSensor'}]
+
+    if not has_token_sequence(tokens, ['move_tank', '(', 'on', ')']):
+        return [{'id': 'moveTankOn'}]
+
+    if not has_token_sequence(tokens, ['lr_power']):
+        return [{'id': 'lrPower'}]
+
+    if not has_token_sequence(tokens, ['move_tank', '(', 'off', ')']):
+        return [{'id': 'moveTankOff'}]
+
+    if not has_token_sequence(tokens, ['color_sensor_measure', '(', 'reflected_light_intensity', ')']):
+        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