Fix a few list output edge cases

Don't add parentheses for nested lists in declarations.

emitter.cpp

@@ -18,7 +18,8 @@ namespace Sass {
     in_wrapped(false),
     in_media_block(false),
     in_declaration(false),
-    in_declaration_list(false)
+    in_space_array(false),
+    in_comma_array(false)
   { }
 
   // return buffer as string

emitter.hpp

@@ -41,7 +41,8 @@ namespace Sass {
       bool in_wrapped;
       bool in_media_block;
       bool in_declaration;
-      bool in_declaration_list;
+      bool in_space_array;
+      bool in_comma_array;
 
     public:
       // return buffer as string

functions.cpp

@@ -1554,7 +1554,7 @@ namespace Sass {
         Output_Style old_style;
         old_style = ctx.output_style;
         ctx.output_style = NESTED;
-        To_String to_string(&ctx);
+        To_String to_string(&ctx, false);
         string inspect = v->perform(&to_string);
         ctx.output_style = old_style;
         return new (ctx.mem) String_Constant(pstate, inspect);

inspect.cpp

@@ -114,6 +114,7 @@ namespace Sass {
   void Inspect::operator()(Declaration* dec)
   {
     if (dec->value()->concrete_type() == Expression::NULL_VAL) return;
+    bool was_decl = in_declaration;
     in_declaration = true;
     if (output_style() == NESTED)
       indentation += dec->tabs();
@@ -128,7 +129,7 @@ namespace Sass {
     append_delimiter();
     if (output_style() == NESTED)
       indentation -= dec->tabs();
-    in_declaration = false;
+    in_declaration = was_decl;
   }
 
   void Inspect::operator()(Assignment* assn)
@@ -346,7 +347,19 @@ namespace Sass {
     else if (in_media_block && sep != " ") sep += " "; // verified
     if (list->empty()) return;
     bool items_output = false;
-    in_declaration_list = in_declaration;
+
+    bool was_space_array = in_space_array;
+    bool was_comma_array = in_comma_array;
+    if (!in_declaration && (
+        (list->separator() == List::SPACE && in_space_array) ||
+        (list->separator() == List::COMMA && in_comma_array)
+    )) {
+      append_string("(");
+    }
+
+    if (list->separator() == List::SPACE) in_space_array = true;
+    else if (list->separator() == List::COMMA) in_comma_array = true;
+
     for (size_t i = 0, L = list->length(); i < L; ++i) {
       Expression* list_item = (*list)[i];
       if (list_item->is_invisible()) {
@@ -360,7 +373,16 @@ namespace Sass {
       list_item->perform(this);
       items_output = true;
     }
-    in_declaration_list = false;
+
+    in_comma_array = was_comma_array;
+    in_space_array = was_space_array;
+    if (!in_declaration && (
+        (list->separator() == List::SPACE && in_space_array) ||
+        (list->separator() == List::COMMA && in_comma_array)
+    )) {
+      append_string(")");
+    }
+
   }
 
   void Inspect::operator()(Binary_Expression* expr)

to_string.cpp

@@ -11,15 +11,15 @@
 namespace Sass {
   using namespace std;
 
-  To_String::To_String(Context* ctx)
-  : ctx(ctx) { }
+  To_String::To_String(Context* ctx, bool in_declaration)
+  : ctx(ctx), in_declaration(in_declaration) { }
   To_String::~To_String() { }
 
   inline string To_String::fallback_impl(AST_Node* n)
   {
     Emitter emitter(ctx);
     Inspect i(emitter);
-    i.in_declaration_list = true;
+    i.in_declaration = in_declaration;
     n->perform(&i);
     return i.get_buffer();
   }

to_string.hpp

@@ -18,9 +18,10 @@ namespace Sass {
     string fallback_impl(AST_Node* n);
 
     Context* ctx;
+    bool in_declaration;
 
   public:
-    To_String(Context* ctx = 0);
+    To_String(Context* ctx = 0, bool in_declaration = true);
     virtual ~To_String();
 
     string operator()(Null* n);