[clang-format] Do not format raw string literals inside a recognized function with a non-recognized delimiter

[krasimir]

Summary

This stops clang-format from touching raw string contents with unrecognized delimiters inside recognized functions.
Unrecognized delimiters signal that the string might be special.

lib/Format/ContinuationIndenter.cpp

 ContinuationIndenter::getRawStringStyle(const FormatToken &Current,
                                         const LineState &State) {
   if (!Current.isStringLiteral())
     return None;
   auto Delimiter = getRawStringDelimiter(Current.TokenText);
   if (!Delimiter)
     return None;
   auto RawStringStyle = RawStringFormats.getDelimiterStyle(*Delimiter);
-  if (!RawStringStyle)
+  if (!RawStringStyle && Delimiter->empty())
     RawStringStyle = RawStringFormats.getEnclosingFunctionStyle(
         getEnclosingFunctionName(Current));
   if (!RawStringStyle)
     return None;
   RawStringStyle->ColumnLimit = getColumnLimit(State);
   return RawStringStyle;
 }
 

unittests/Format/FormatTestRawStrings.cpp

int f() {
    [cccccccccc.pppppppppppppp.TTTTTTTTTTTTTTTTTTTT] { field_2: "123_2" }}}
    )pb");
   }
 }
 )test",
                     Style));
 }
 
+TEST_F(FormatTestRawStrings,
+       DoNotFormatUnrecognizedDelimitersInRecognizedFunctions) {
+  FormatStyle Style = getRawStringPbStyleWithColumns(60);
+  Style.RawStringFormats[0].EnclosingFunctions.push_back(
+      "EqualsProto");
+  // EqualsProto is a recognized function, but the Raw delimiter is
+  // unrecognized. Do not touch the string in this case, since it might be
+  // special.
+  expect_eq(R"test(
+void f() {
+  aaaaaaaaa(bbbbbbbbb, EqualsProto(R"Raw(
+item {
+  key: value
+}
+)Raw"));
+})test",
+            format(R"test(
+void f() {
+  aaaaaaaaa(bbbbbbbbb, EqualsProto(R"Raw(
+item {
+  key: value
+}
+)Raw"));
+})test",
+                   Style));
+}
 
 } // end namespace
 } // end namespace format
 } // end namespace clang