Unbreak parsing of argument-less functions.

3 files changed, 18 insertions, 7 deletions

diff --git a/scss/__init__.py b/scss/__init__.py
index cb9061c..a665d1c 100644
--- a/scss/__init__.py
+++ b/scss/__init__.py
@@ -616,13 +616,14 @@ class Scss(object):
                 raise SyntaxError("Expected ')', found end of line: %r" % (block.argument,))
             argstr = argstr[:-1]
 
-            calculator = Calculator(rule.namespace)
-            argspec_node = calculator.parse_expression(argstr, target='argspec')
-
-            for var_name, default in argspec_node.iter_def_argspec():
-                new_params.append(var_name)
-                if default is not None:
-                    defaults[var_name] = default
+            if argstr:
+                calculator = Calculator(rule.namespace)
+                argspec_node = calculator.parse_expression(argstr, target='argspec')
+
+                for var_name, default in argspec_node.iter_def_argspec():
+                    new_params.append(var_name)
+                    if default is not None:
+                        defaults[var_name] = default
 
         mixin = [list(new_params), defaults, block.unparsed_contents]
         if block.directive == '@function':
diff --git a/scss/tests/files/regressions/015-function-no-arguments.css b/scss/tests/files/regressions/015-function-no-arguments.css
new file mode 100644
index 0000000..3bdc1c8
--- /dev/null
+++ b/scss/tests/files/regressions/015-function-no-arguments.css
@@ -0,0 +1,3 @@
+h1 {
+  line-height: 5;
+}
diff --git a/scss/tests/files/regressions/015-function-no-arguments.scss b/scss/tests/files/regressions/015-function-no-arguments.scss
new file mode 100644
index 0000000..273b9a5
--- /dev/null
+++ b/scss/tests/files/regressions/015-function-no-arguments.scss
@@ -0,0 +1,7 @@
+@function get-a-number() {
+    @return 5;
+}
+
+h1 {
+    line-height: get-a-number();
+}