[PATCH] D30399: clang-format: [JS] whitespace after async in arrow functions.

[Martin Probst via Phabricator via cfe-commits]

mprobst created this revision.
Herald added a subscriber: klimek.

Async arrow functions should be marked with a whitespace after the async keyword, before the parameter list:

  x = async () => foo();

Before:

  x = async() => foo();

This makes it easier to tell apart an async arrow function from a call to a function called async.


https://reviews.llvm.org/D30399

Files:
  lib/Format/TokenAnnotator.cpp
  unittests/Format/FormatTestJS.cpp


Index: unittests/Format/FormatTestJS.cpp
===================================================================
--- unittests/Format/FormatTestJS.cpp
+++ unittests/Format/FormatTestJS.cpp
@@ -463,6 +463,8 @@
   verifyFormat("export async function f() {\n"
                "  return fetch(x);\n"
                "}");
+  verifyFormat("let x = async () => f();");
+  verifyFormat("let x = async();");
   verifyFormat("class X {\n"
                "  async asyncMethod() {\n"
                "    return fetch(1);\n"
Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -2225,6 +2225,12 @@
   } else if (Style.Language == FormatStyle::LK_JavaScript) {
     if (Left.is(TT_JsFatArrow))
       return true;
+    if (Left.is(Keywords.kw_async) && Right.is(tok::l_paren) &&
+        Right.MatchingParen && Right.MatchingParen->getNextNonComment() &&
+        Right.MatchingParen->getNextNonComment()->is(TT_JsFatArrow))
+      // An async arrow function, for example: `x = async () => foo();`,
+      // as opposed to calling a function called async: `x = async();`
+      return true;
     if ((Left.is(TT_TemplateString) && Left.TokenText.endswith("${")) ||
         (Right.is(TT_TemplateString) && Right.TokenText.startswith("}")))
       return false;


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D30399.89851.patch
Type: text/x-patch
Size: 1369 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20170227/4a0ba406/attachment-0001.bin>