From 33697496490251b3fea04614c98a088ba0e04c6a Mon Sep 17 00:00:00 2001
From: Pootle daemon <pootle@pootle.sugarlabs.org>
Date: Tue, 05 Nov 2013 05:32:43 +0000
Subject: Merge branch 'master' of git.sugarlabs.org:turtleart/mainline

---
diff --git a/TurtleArt/tabasics.py b/TurtleArt/tabasics.py
index ce84a49..1dcaa56 100644
--- a/TurtleArt/tabasics.py
+++ b/TurtleArt/tabasics.py
@@ -179,9 +179,8 @@ class Palettes():
                           help_string=_('moves turtle backward'))
         self.tw.lc.def_prim(
             'back', 1,
-            Primitive(Turtle.forward,
-                      arg_descs=[ArgSlot(TYPE_NUMBER,
-                                         wrapper=self.prim_cache["minus"])],
+            Primitive(Turtle.backward,
+                      arg_descs=[ArgSlot(TYPE_NUMBER)],
                       call_afterwards=self.after_move))
 
         palette.add_block('clean',
@@ -214,9 +213,8 @@ turtle'))
 in degrees)'))
         self.tw.lc.def_prim(
             'left', 1,
-            Primitive(Turtle.right,
-                      arg_descs=[ArgSlot(TYPE_NUMBER,
-                                         wrapper=self.prim_cache["minus"])],
+            Primitive(Turtle.left,
+                      arg_descs=[ArgSlot(TYPE_NUMBER)],
                       call_afterwards=self.after_right))
 
         palette.add_block('right',
diff --git a/TurtleArt/taconstants.py b/TurtleArt/taconstants.py
index 1cedaa3..4cedb34 100644
--- a/TurtleArt/taconstants.py
+++ b/TurtleArt/taconstants.py
@@ -79,6 +79,12 @@ 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',
+                      'fillscreen2']
+
 KEY_DICT = {
             'Left': 1,
             'KP_Left': 1,
diff --git a/TurtleArt/taturtle.py b/TurtleArt/taturtle.py
index 88f4782..02d4d31 100644
--- a/TurtleArt/taturtle.py
+++ b/TurtleArt/taturtle.py
@@ -561,6 +561,15 @@ class Turtle:
                                               round_int(self._heading)]))
             self._turtles.turtle_window.send_event(event)
 
+    def left(self, degrees, share=True):
+        try:
+            degrees = 0 - degrees
+        except:
+            debug_output('bad value sent to %s' % (__name__),
+                         self._turtles.turtle_window.running_sugar)
+            return
+        self.right(degrees, share)
+
     def _draw_line(self, old, new, pendown):
         if self._pen_state and pendown:
             self._turtles.turtle_window.canvas.set_source_rgb()
@@ -574,6 +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()
@@ -593,6 +603,15 @@ class Turtle:
                                               int(distance)]))
             self._turtles.turtle_window.send_event(event)
 
+    def backward(self, distance, share=True):
+        try:
+            distance = 0 - distance
+        except:
+            debug_output('bad value sent to %s' % (__name__),
+                         self._turtles.turtle_window.running_sugar)
+            return
+        self.forward(distance, share)
+
     def set_xy(self, x, y, share=True, pendown=True, dragging=False):
         old = self.get_xy()
         try:
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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