clang-format: [JS] supports casts to types starting with punctuation …

…("{[(").

Before:

    x as{x: number}

After:

    x as {x: number}

Reviewers: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D23761

llvm-svn: 279436

clang/lib/Format/TokenAnnotator.cpp

@@ -2121,6 +2121,9 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
                      Keywords.kw_of, tok::kw_const) &&
         (!Left.Previous || !Left.Previous->is(tok::period)))
       return true;
+    if (Left.is(Keywords.kw_as) &&
+        Right.isOneOf(tok::l_square, tok::l_brace, tok::l_paren))
+      return true;
     if (Left.is(tok::kw_default) && Left.Previous &&
         Left.Previous->is(tok::kw_export))
       return true;

clang/unittests/Format/FormatTestJS.cpp

@@ -1219,6 +1219,9 @@ TEST_F(FormatTestJS, CastSyntax) {
                "  2\n"
                "];");
   verifyFormat("var x = [{x: 1} as type];");
+  verifyFormat("x = x as [a, b];");
+  verifyFormat("x = x as {a: string};");
+  verifyFormat("x = x as (string);");
 }
 
 TEST_F(FormatTestJS, TypeArguments) {