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

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.

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D48728

llvm-svn: 335876

clang/lib/Format/ContinuationIndenter.cpp

@@ -1648,7 +1648,7 @@ ContinuationIndenter::getRawStringStyle(const FormatToken &Current,
   if (!Delimiter)
     return None;
   auto RawStringStyle = RawStringFormats.getDelimiterStyle(*Delimiter);
-  if (!RawStringStyle)
+  if (!RawStringStyle && Delimiter->empty())
     RawStringStyle = RawStringFormats.getEnclosingFunctionStyle(
         getEnclosingFunctionName(Current));
   if (!RawStringStyle)

clang/unittests/Format/FormatTestRawStrings.cpp

@@ -862,6 +862,32 @@ int f() {
                     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