From 0a6a3deb566df8c7832b6181d03db55039200976 Mon Sep 17 00:00:00 2001
From: Marion <marion.zepf@gmail.com>
Date: Fri, 16 Aug 2013 13:19:53 +0000
Subject: special handling for 'hat' and 'stack' blocks when exporting them

---
diff --git a/TurtleArt/taexportpython.py b/TurtleArt/taexportpython.py
index c87757d..88a73a0 100644
--- a/TurtleArt/taexportpython.py
+++ b/TurtleArt/taexportpython.py
@@ -31,7 +31,7 @@ import util.codegen as codegen
 
 from talogo import LogoCode
 from taprimitive import (Primitive, PyExportError, value_to_ast)
-from tautils import (debug_output, find_group, find_top_block)
+from tautils import (debug_output, find_group, find_top_block, get_stack_name)
 
 
 
@@ -93,10 +93,11 @@ def save_python(tw):
 
     snippets = [_SETUP_CODE_START]
     for block in tops_of_stacks:
-        # TODO name of action stack?
-        pythoncode = _action_stack_to_python(block, tw.lc)
-        snippets.append(pythoncode)
-        snippets.append(linesep)
+        stack_name = get_stack_name(block)
+        if stack_name:
+            pythoncode = _action_stack_to_python(block, tw.lc, name=stack_name)
+            snippets.append(pythoncode)
+            snippets.append(linesep)
     snippets.append(_SETUP_CODE_END)
     return "".join(snippets)
 
@@ -164,7 +165,7 @@ def _walk_action_stack(top_block, lc):
                                     block=block)
             if isinstance(new_ast, (list, tuple)):
                 ast_list.extend(new_ast)
-            else:
+            elif new_ast is not None:
                 ast_list.append(new_ast)
         elif arg_asts:
             new_ast = ast.List(elts=arg_asts, ctx=ast.Load)
diff --git a/TurtleArt/taprimitive.py b/TurtleArt/taprimitive.py
index 1fbeac9..6f83294 100644
--- a/TurtleArt/taprimitive.py
+++ b/TurtleArt/taprimitive.py
@@ -365,6 +365,15 @@ class Primitive(object):
             id_str = 'BOX[%s]' % (repr(ast_to_value(new_arg_asts[0])))
             return ast.Name(id=id_str, ctx=ast.Load)
 
+        # action stacks
+        elif self == LogoCode.prim_define_stack:
+            return
+        elif self == LogoCode.prim_invoke_stack:
+            stack_name = ast_to_value(new_arg_asts[0])
+            stack_func_name = 'ACTION[%s]' % (repr(stack_name))
+            stack_func = ast.Name(id=stack_func_name, ctx=ast.Load)
+            return get_call_ast('logo.icall', [stack_func])
+
         # standard operators
         elif self.func.__name__ in Primitive.STANDARD_OPERATORS:
             op = Primitive.STANDARD_OPERATORS[self.func.__name__]
--
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