Fix Function_Call parsing in value schemas

Author: mgreter

parser.cpp

@@ -1354,7 +1354,7 @@ namespace Sass {
     else if (lex< identifier_schema >()) {
       return parse_identifier_schema();
     }
-    else if (peek< re_pseudo_selector >()) {
+    else if (peek< re_functional >()) {
       return parse_function_call();
     }
     else if (lex< exactly<'+'> >()) {
@@ -1588,6 +1588,9 @@ namespace Sass {
       if (lex< spaces >() && num_items) {
         (*schema) << new (ctx.mem) String_Quoted(pstate, " ");
       }
+      if (peek< re_functional >()) {
+        (*schema) << parse_function_call();
+      }
       // lex an interpolant /#{...}/
       else if (lex< exactly < hash_lbrace > >()) {
         // Try to lex static expression first

prelexer.cpp

@@ -514,6 +514,9 @@ namespace Sass {
       return src;
     }
 
+    const char* re_functional(const char* src) {
+      return sequence< identifier, optional < block_comment >, exactly<'('> >(src);
+    }
     const char* re_pseudo_selector(const char* src) {
       return sequence< identifier, optional < block_comment >, exactly<'('> >(src);
     }

prelexer.hpp

@@ -293,6 +293,7 @@ namespace Sass {
     // Match CSS pseudo-class/element prefixes
     const char* pseudo_prefix(const char* src);
     // Match CSS function call openers.
+    const char* re_functional(const char* src);
     const char* re_pseudo_selector(const char* src);
     const char* functional_schema(const char* src);
     const char* pseudo_not(const char* src);