Improve at-root handling with mixins

Author: mgreter

src/ast.hpp

@@ -2117,7 +2117,10 @@ namespace Sass {
                      Compound_Selector* h = 0,
                      Complex_Selector* t = 0,
                      String* r = 0)
-    : Selector(pstate), combinator_(c), head_(h), tail_(t), reference_(r)
+    : Selector(pstate),
+      combinator_(c),
+      head_(h), tail_(t),
+      reference_(r)
     {
       if ((h && h->has_reference())   || (t && t->has_reference()))   has_reference(true);
       if ((h && h->has_placeholder()) || (t && t->has_placeholder())) has_placeholder(true);

src/debugger.hpp

@@ -71,7 +71,8 @@ inline void debug_ast(AST_Node* node, std::string ind, Env* env)
     std::cerr << " (" << pstate_source_position(node) << ")";
     std::cerr << " " << root_block->tabs();
     std::cerr << std::endl;
-    if (root_block->block()) for(auto i : root_block->block()->elements()) { debug_ast(i, ind + " ", env); }
+    debug_ast(root_block->expression(), ind + ":", env);
+    debug_ast(root_block->block(), ind + " ", env);
   } else if (dynamic_cast<Selector_List*>(node)) {
     Selector_List* selector = dynamic_cast<Selector_List*>(node);
     std::cerr << ind << "Selector_List " << selector;

src/expand.cpp

@@ -625,11 +625,18 @@ namespace Sass {
     Env* env = environment();
     // convert @content directives into mixin calls to the underlying thunk
     if (!env->has("@content[m]")) return 0;
+    if (block_stack.back()->is_root()) {
+      selector_stack.push_back(0);
+    }
     Mixin_Call* call = SASS_MEMORY_NEW(ctx.mem, Mixin_Call,
                                        c->pstate(),
                                        "@content",
                                        SASS_MEMORY_NEW(ctx.mem, Arguments, c->pstate()));
-    return call->perform(this);
+    Statement* stm = call->perform(this);
+    if (block_stack.back()->is_root()) {
+      selector_stack.pop_back();
+    }
+    return stm;
   }
 
   // produce an error if something is not implemented