clang-format: [JS] Support pseudo-keywords

JavaScript allows keywords to appear in IdenfierName positions, e.g.
fields, or object literal members, but not as plain identifiers.

Patch by Martin Probst. Thank you!

llvm-svn: 248714

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index c02d51be505..f09df281429 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -99,6 +99,19 @@ TEST_F(FormatTestJS, LiteralOperatorsCanBeKeywords) {
   verifyFormat("not.and.or.not_eq = 1;");
 }
 
+TEST_F(FormatTestJS, ReservedWords) {
+  // JavaScript reserved words (aka keywords) are only illegal when used as
+  // Identifiers, but are legal as IdentifierNames.
+  verifyFormat("x.class.struct = 1;");
+  verifyFormat("x.case = 1;");
+  verifyFormat("x.interface = 1;");
+  verifyFormat("x = {\n"
+               "  a: 12,\n"
+               "  interface: 1,\n"
+               "  switch: 1,\n"
+               "};");
+}
+
 TEST_F(FormatTestJS, ES6DestructuringAssignment) {
   verifyFormat("var [a, b, c] = [1, 2, 3];");
   verifyFormat("let [a, b, c] = [1, 2, 3];");