1 files changed, 60 insertions, 0 deletions
diff --git a/robot/problems/introduction/spotturn90/common.py b/robot/problems/introduction/spotturn90/common.py
new file mode 100644
index 0000000..39e9148
--- /dev/null
+++ b/robot/problems/introduction/spotturn90/common.py
@@ -0,0 +1,60 @@
+# 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 = 214
+group = 'introduction'
+number = 3
+visible = True
+
+solution = '''\
+from ev3dev import *
+from mindstorms_widgets import mindstorms_widgets
+
+robot = mindstorms_widgets()
+robot.connect_motor( 'left' )
+robot.connect_motor( 'right' )
+
+robot.move_tank( 'on_for_seconds', lr_power=[20,-20], seconds=.9 )
+'''
+
+hint_type = {
+    'mW_init': Hint('mW_init'),
+    'connectMotorLeft': Hint('connectMotorLeft'),
+    'connectMotorRight': Hint('connectMotorRight'),
+    'moveTank': Hint('moveTank'),
+    'onForSeconds': Hint('onForSeconds'),
+    'lrPower': Hint('lrPower'),
+    'seconds': Hint('seconds'),
+}
+
+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, ['move_tank']):
+        return [{'id': 'moveTank'}]
+
+    if not 'on_for_seconds' in code:
+        return [{'id': 'onForSeconds'}]
+    
+    if not 'seconds' in code:
+        return [{'id': 'seconds'}]
+    
+    if not 'lr_power' in code:
+        return [{'id': 'lrPower'}]
+    
+    return None