[PATCH] Support for JavaScript === and !== operators.

[Alexander Kornienko]

Hi klimek, djasper,

http://llvm-reviews.chandlerc.com/D2231

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

Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -1363,6 +1363,10 @@
   if (Tok.isOneOf(tok::arrowstar, tok::periodstar) ||
       Tok.Previous->isOneOf(tok::arrowstar, tok::periodstar))
     return false;
+  // JavaScript identity operators ===, !==.
+  if (Tok.Previous->isOneOf(tok::equalequal, tok::exclaimequal) &&
+      Tok.is(tok::equal))
+    return false;
   if (!Style.SpaceBeforeAssignmentOperators &&
       Tok.getPrecedence() == prec::Assignment)
     return false;
@@ -1452,6 +1456,9 @@
     return false;
   if (Left.is(tok::equal) && Line.Type == LT_VirtualFunctionDecl)
     return false;
+  // JavaScript identity operators ===, !==.
+  if (Left.isOneOf(tok::equalequal, tok::exclaimequal) && Right.is(tok::equal))
+    return false;
   if (Left.Previous) {
     if (Left.is(tok::l_paren) && Right.is(tok::l_paren) &&
         Left.Previous->is(tok::kw___attribute))
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