1 files changed, 40 insertions, 12 deletions
diff --git a/robot/problems/introduction/forward/common.py b/robot/problems/introduction/forward/common.py
index 5023d7f..d1e1193 100644
--- a/robot/problems/introduction/forward/common.py
+++ b/robot/problems/introduction/forward/common.py
@@ -1,6 +1,8 @@
 # coding=utf-8
 
-from server.hints import Hint
+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 = 202
 group = 'introduction'
@@ -13,21 +15,47 @@ from ev3dev import *
 from mindstorms_widgets import mindstorms_widgets
 
 robot = mindstorms_widgets()
-robot.connect_motor('left')
-robot.connect_motor('right')
+robot.connect_motor( 'left' )
+robot.connect_motor( 'right' )
 
-robot.move_steering('on', power=50)
-time.sleep(3)
-robot.move_steering('off', brake_at_end=True)
+robot.move_steering( 'on_for_seconds', direction=0, seconds=3 )
 '''
 
 hint_type = {
-    'ev3dev': Hint('ev3dev'),
-    'mindWidgets': Hint('mindWidgets'),
+    'mW_init': Hint('mW_init'),
+    'connectMotorLeft': Hint('connectMotorLeft'),
+    'connectMotorRight': Hint('connectMotorRight'),
+    'moveSteering': Hint('moveSteering'),
+    'onForSeconds': Hint('onForSeconds'),
+    'direction': Hint('direction'),
+    'seconds': Hint('seconds'),
 }
 
-def test(program):
-    return False, []
+def hint( code):
+    tokens = get_tokens(code)
 
-def hint(program):
-    return []
+    # 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, ['move_steering']):
+        return [{'id': 'moveSteering'}]
+
+    if not has_token_sequence(tokens, ['on_for_seconds']):
+        return [{'id': 'onForSeconds'}]
+    
+    if not has_token_sequence(tokens, ['direction']):
+        return [{'id': 'direction'}]
+    
+    if not has_token_sequence(tokens, ['seconds']):
+        return [{'id': 'seconds'}]
+
+    return None