From ab3ce592d027e3a10fb21e703cab1507f8d9bb03 Mon Sep 17 00:00:00 2001
From: Daniel Jasper <djasper@google.com>
Date: Thu, 1 Aug 2013 22:05:00 +0000
Subject: [PATCH] clang-format: Don't break empty 2nd operand of ternary expr.

Before:
  some_quite_long_variable_name_ptr
      ?
      : argv[9] ? ptr : argv[8] ? : argv[7] ? ptr : argv[6];
After:
  some_quite_long_variable_name_ptr
      ?: argv[9] ? ptr : argv[8] ?: argv[7] ? ptr : argv[6];

Patch by Adam Strzelecki, thank you!!

This fixed llvm.org/PR16758.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187622 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Format/Format.cpp           |  3 ++-
 lib/Format/TokenAnnotator.cpp   |  9 ++++++---
 unittests/Format/FormatTest.cpp | 18 +++++++++++++++++-
 3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/lib/Format/Format.cpp b/lib/Format/Format.cpp
index f59fb37996..b2bf3fea98 100644
--- a/lib/Format/Format.cpp
+++ b/lib/Format/Format.cpp
@@ -1237,7 +1237,8 @@ private:
         return true;
     }
     if ((Previous.isOneOf(tok::comma, tok::semi) || Current.is(tok::question) ||
-         Current.Type == TT_ConditionalExpr) &&
+         (Current.Type == TT_ConditionalExpr &&
+          !(Current.is(tok::colon) && Previous.is(tok::question)))) &&
         State.Stack.back().BreakBeforeParameter &&
         !Current.isTrailingComment() &&
         !Current.isOneOf(tok::r_paren, tok::r_brace))
diff --git a/lib/Format/TokenAnnotator.cpp b/lib/Format/TokenAnnotator.cpp
index 39ebe95a43..af80650271 100644
--- a/lib/Format/TokenAnnotator.cpp
+++ b/lib/Format/TokenAnnotator.cpp
@@ -1158,7 +1158,7 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
   if (Left.is(tok::colon))
     return Left.Type != TT_ObjCMethodExpr;
   if (Right.is(tok::colon))
-    return Right.Type != TT_ObjCMethodExpr;
+    return Right.Type != TT_ObjCMethodExpr && !Left.is(tok::question);
   if (Left.is(tok::l_paren))
     return false;
   if (Right.is(tok::l_paren)) {
@@ -1220,7 +1220,8 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
     return false;
   if (Tok.is(tok::colon))
     return !Line.First->isOneOf(tok::kw_case, tok::kw_default) &&
-           Tok.getNextNonComment() != NULL && Tok.Type != TT_ObjCMethodExpr;
+           Tok.getNextNonComment() != NULL && Tok.Type != TT_ObjCMethodExpr &&
+           !Tok.Previous->is(tok::question);
   if (Tok.Previous->Type == TT_UnaryOperator ||
       Tok.Previous->Type == TT_CastRParen)
     return false;
@@ -1260,7 +1261,9 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
     return true;
   if (Left.ClosesTemplateDeclaration)
     return true;
-  if (Right.Type == TT_ConditionalExpr || Right.is(tok::question))
+  if ((Right.Type == TT_ConditionalExpr &&
+       !(Right.is(tok::colon) && Left.is(tok::question))) ||
+      Right.is(tok::question))
     return true;
   if (Right.Type == TT_RangeBasedForLoopColon ||
       Right.Type == TT_OverloadedOperatorLParen)
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index e2bb65d675..e383fc2d62 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -2921,6 +2921,10 @@ TEST_F(FormatTest, BreaksConditionalExpressions) {
       "                   aaaaaaaaaaaaaaaa ? aaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
       "                                    : aaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
       "                   aaaaaaaaaaaaa);");
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+      "                   aaaaaaaaaaaaaaaa ?: aaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+      "                   aaaaaaaaaaaaa);");
   verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
                "    ? aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
                "          aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)\n"
@@ -2933,7 +2937,11 @@ TEST_F(FormatTest, BreaksConditionalExpressions) {
                "           : aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
                "                 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa),\n"
                "       aaaaaaaaaaaaaaaaaaaaaaaaaaa);");
-
+  verifyFormat("aaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+               "       aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
+               "           ?: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+               "                  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa),\n"
+               "       aaaaaaaaaaaaaaaaaaaaaaaaaaa);");
   verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
                "    ? aaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
                "    : aaaaaaaaaaaaaaaaaaaaaaaaaaa;");
@@ -2978,6 +2986,14 @@ TEST_F(FormatTest, BreaksConditionalExpressions) {
       "        : aaaaaaaaaaaaaaa);\n"
       "}",
       NoBinPacking);
+  verifyFormat(
+      "void f() {\n"
+      "  g(aaa,\n"
+      "    aaaaaaaaaa == aaaaaaaaaa ? aaaa : aaaaa,\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa == aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
+      "        ?: aaaaaaaaaaaaaaa);\n"
+      "}",
+      NoBinPacking);
 }
 
 TEST_F(FormatTest, DeclarationsOfMultipleVariables) {
-- 
2.40.0