Allow empty spa.Actions.

Fixes #107.
nengo · Nov 9, 2017 · ecaf806 · ecaf806
1 parent fb6dc0f
commit ecaf806
Show file tree

Hide file tree

Showing 3 changed files with 8 additions and 1 deletion.
diff --git a/CHANGES.rst b/CHANGES.rst
@@ -30,6 +30,12 @@ Release History
   (`#61 <https://github.com/nengo/nengo_spa/pull/99>`_,
   `#28 <https://github.com/nengo/nengo_spa/issues/80>`_)
 
+**Fixed**
+
+- Allow the ``spa.Actions`` string to be empty.
+  (`#107 <https://github.com/nengo/nengo_spa/issues/107>`_,
+  `#109 <https://github.com/nengo/nengo_spa/pull/109>`_)
+
 
 0.3.1 (November 7, 2017)
 ========================

diff --git a/nengo_spa/compiler/grammar.py b/nengo_spa/compiler/grammar.py
@@ -161,7 +161,7 @@ def read(self, tokens):
             match.extend(Terminal(type=tk.DEDENT).read(tokens))
         else:
             # Main block is just a single line of Python without indentation
-            match = AtLeastOne(action).read(tokens)
+            match = AnyNumber(action).read(tokens)
         return match
 
     def __str__(self):

diff --git a/nengo_spa/compiler/tests/test_grammar.py b/nengo_spa/compiler/tests/test_grammar.py
@@ -24,6 +24,7 @@ def effect_tree(source, target):
 
 
 @pytest.mark.parametrize('code, parse_tree', [
+    ('', []),
     ('a -> b', [effect_tree('a', 'b')]),
     ('a.x -> b.y', [effect_tree('a.x', 'b.y')]),
     ('a -> b; c -> d', [