clang-format: [JS] recognized named functions in AnnotatingParser.

Summary: This also fixes union type formatting in function parameter types.

Before: function x(path: number| string) {}
After: function x(path: number|string) {}

Reviewers: djasper

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D21206

llvm-svn: 272330
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 2a5fe94..b469cfa 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -142,7 +142,10 @@
       // static_assert, if and while usually contain expressions.
       Contexts.back().IsExpression = true;
     } else if (Style.Language == FormatStyle::LK_JavaScript && Left->Previous &&
-               Left->Previous->is(Keywords.kw_function)) {
+               (Left->Previous->is(Keywords.kw_function) ||
+                (Left->Previous->endsSequence(tok::identifier,
+                                              Keywords.kw_function)))) {
+      // function(...) or function f(...)
       Contexts.back().IsExpression = false;
     } else if (Left->Previous && Left->Previous->is(tok::r_square) &&
                Left->Previous->MatchingParen &&
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index f646b82..3d96779 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -903,6 +903,8 @@
   verifyFormat("let x: Foo<A|B> = new Foo<A|B>();");
   verifyFormat("function(x: A|B): C&D {}");
   verifyFormat("function(x: A|B = A | B): C&D {}");
+  verifyFormat("function x(path: number|string) {}");
+  verifyFormat("function x(): string|number {}");
 }
 
 TEST_F(FormatTestJS, ClassDeclarations) {