[clang-format][NFC] Handle language specific stuff at the top...

... of TokenAnnotator::splitPenalty. That is in my eyes a bit clearer
in the workflow.

As a drive-by introduce (but not adapt anywhere else) isProto().

Differential Revision: https://reviews.llvm.org/D135871

Author: HazardyKnusperkeks

clang/include/clang/Format/Format.h

@@ -2617,6 +2617,7 @@ struct FormatStyle {
   bool isJson() const { return Language == LK_Json; }
   bool isJavaScript() const { return Language == LK_JavaScript; }
   bool isVerilog() const { return Language == LK_Verilog; }
+  bool isProto() const { return Language == LK_Proto; }
 
   /// Language, this format style is targeted at.
   /// \version 3.5

clang/lib/Format/TokenAnnotator.cpp

@@ -3097,6 +3097,7 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
   if (Left.is(tok::semi))
     return 0;
 
+  // Language specific handling.
   if (Style.Language == FormatStyle::LK_Java) {
     if (Right.isOneOf(Keywords.kw_extends, Keywords.kw_throws))
       return 1;
@@ -3116,13 +3117,16 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
     // Prefer breaking call chains (".foo") over empty "{}", "[]" or "()".
     if (Left.opensScope() && Right.closesScope())
       return 200;
+  } else if (Style.isProto()) {
+    if (Right.is(tok::l_square))
+      return 1;
+    if (Right.is(tok::period))
+      return 500;
   }
 
   if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
     return 1;
   if (Right.is(tok::l_square)) {
-    if (Style.Language == FormatStyle::LK_Proto)
-      return 1;
     if (Left.is(tok::r_square))
       return 200;
     // Slightly prefer formatting local lambda definitions like functions.
@@ -3135,10 +3139,8 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
     }
   }
 
-  if (Left.is(tok::coloncolon) ||
-      (Right.is(tok::period) && Style.Language == FormatStyle::LK_Proto)) {
+  if (Left.is(tok::coloncolon))
     return 500;
-  }
   if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
       Right.is(tok::kw_operator)) {
     if (Line.startsWith(tok::kw_for) && Right.PartOfMultiVariableDeclStmt)