[clang-format] Recognize Java logical shift assignment operator

At present, clang-format mangles Java containing logical right shift operators
('>>>=' or '>>>'), splitting them in two, resulting in invalid code:

 public class Minimal {
   public void func(String args) {
     int i = 42;
-    i >>>= 1;
+    i >> >= 1;
     return i;
   }
 }

This adds both forms of logical right shift to the FormatTokenLexer, so
clang-format won't attempt to split them and insert bogus whitespace.

https://reviews.llvm.org/D31652
Patch from Richard Bradfield <bradfier@fstab.me>!

llvm-svn: 299952

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestJava.cpp b/clang/unittests/Format/FormatTestJava.cpp
index ee09ca9..6e685f6 100644
--- a/clang/unittests/Format/FormatTestJava.cpp
+++ b/clang/unittests/Format/FormatTestJava.cpp
@@ -522,5 +522,17 @@ TEST_F(FormatTestJava, AlignsBlockComments) {
                    "  void f() {}"));
 }
 
+TEST_F(FormatTestJava, RetainsLogicalShifts) {
+    verifyFormat("void f() {\n"
+                 "  int a = 1;\n"
+                 "  a >>>= 1;\n"
+                 "}");
+    verifyFormat("void f() {\n"
+                 "  int a = 1;\n"
+                 "  a = a >>> 1;\n"
+                 "}");
+}
+
+
 } // end namespace tooling
 } // end namespace clang