From cbfc7003fa5adf7455b3892a38cc780195f4ef8c Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Mon, 04 Nov 2013 23:44:04 +0000
Subject: add more restrictions to arithmetic docking

---
diff --git a/TurtleArt/taconstants.py b/TurtleArt/taconstants.py
index 1cedaa3..811e499 100644
--- a/TurtleArt/taconstants.py
+++ b/TurtleArt/taconstants.py
@@ -79,6 +79,11 @@ XO4 = 'xo4'
 UNKNOWN = 'unknown'
 TMP_SVG_PATH = '/tmp/turtle_output.svg'
 
+ARG_MUST_BE_NUMBER = ['product2', 'minus2', 'random', 'remainder2', 'forward',
+                      'back', 'left', 'right', 'arc', 'setxy2', 'setxy',
+                      'fillscreen', 'setscale', 'setpensize', 'wait',
+                      'setcolor', 'seth', 'setgray', 'setshade', 'string']
+
 KEY_DICT = {
             'Left': 1,
             'KP_Left': 1,
diff --git a/TurtleArt/taturtle.py b/TurtleArt/taturtle.py
index a404943..02d4d31 100644
--- a/TurtleArt/taturtle.py
+++ b/TurtleArt/taturtle.py
@@ -583,6 +583,7 @@ class Turtle:
                 self._poly_points.append(('line', pos2[0], pos2[1]))
 
     def forward(self, distance, share=True):
+        print distance
         scaled_distance = distance * self._turtles.turtle_window.coord_scale
 
         old = self.get_xy()
diff --git a/TurtleArt/tautils.py b/TurtleArt/tautils.py
index ef80877..ff30b19 100644
--- a/TurtleArt/tautils.py
+++ b/TurtleArt/tautils.py
@@ -51,7 +51,7 @@ except (ImportError, AttributeError):
 from StringIO import StringIO
 
 from taconstants import (HIT_HIDE, HIT_SHOW, XO1, XO15, XO175, XO4, UNKNOWN,
-                         MAGICNUMBER, SUFFIX)
+                         MAGICNUMBER, SUFFIX, ARG_MUST_BE_NUMBER)
 
 import logging
 _logger = logging.getLogger('turtleart-activity')
@@ -677,14 +677,11 @@ def arithmetic_check(blk1, blk2, dock1, dock2):
                 return False
             if dock1 == 2 and zero_arg(blk2.values[0]):
                 return False
-    elif blk1.name \
-            in ['product2', 'minus2', 'random', 'remainder2', 'string'] and \
-            blk2.name \
-            in ['product2', 'minus2', 'random', 'remainder2', 'string']:
+    elif blk1.name in ARG_MUST_BE_NUMBER and blk2.name in ARG_MUST_BE_NUMBER:
         if blk1.name == 'string':
             if not numeric_arg(blk1.values[0]):
                 return False
-        elif blk1.name == 'string':
+        elif blk2.name == 'string':
             if not numeric_arg(blk2.values[0]):
                 return False
     elif blk1.name in ['greater2', 'less2'] and blk2.name == 'string':
--
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