Error on invalid parent selector placements

src/parser.cpp

@@ -732,6 +732,18 @@ namespace Sass {
  // this produces a linefeed!?
  seq->has_parent_reference(true);
  (*seq) << SASS_MEMORY_NEW(ctx.mem, Parent_Selector, pstate);
+ // parent selector only allowed at start
+ // upcoming sass may allow also trailing
+ if (seq->length() > 1) {
+ ParserState state(pstate);
+ Simple_Selector* cur = (*seq)[seq->length()-1];
+ Simple_Selector* prev = (*seq)[seq->length()-2];
+ std::string sel(prev->to_string(false, 5));
+ std::string found(cur->to_string(false, 5));
+ if (lex < identifier >()) { found += std::string(lexed); }
+ error("Invalid CSS after \"" + sel + "\": expected \"{\", was \"" + found + "\"\n\n"
+ "\"" + found + "\" may only be used at the beginning of a compound selector.", state);
+ }
  }
  // parse type selector
  else if (lex< re_type_selector >(false))