r182608 - Fix aligning of comments.

[Manuel Klimek]

Author: klimek
Date: Thu May 23 15:46:07 2013
New Revision: 182608

URL: http://llvm.org/viewvc/llvm-project?rev=182608&view=rev
Log:
Fix aligning of comments.

Previously we started sequences to align for single line comments when
the previous line had a trailing comment, but the sequence was broken
for other reasons.

Now we re-format:
// a
 // b
f(); // c
to:
// a
// b
f(); // c

Modified:
    cfe/trunk/lib/Format/WhitespaceManager.cpp
    cfe/trunk/unittests/Format/FormatTest.cpp

Modified: cfe/trunk/lib/Format/WhitespaceManager.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Format/WhitespaceManager.cpp?rev=182608&r1=182607&r2=182608&view=diff
==============================================================================
--- cfe/trunk/lib/Format/WhitespaceManager.cpp (original)
+++ cfe/trunk/lib/Format/WhitespaceManager.cpp Thu May 23 15:46:07 2013
@@ -170,10 +170,11 @@ void WhitespaceManager::alignTrailingCom
         MinColumn = std::max(MinColumn, ChangeMinColumn);
         MaxColumn = std::min(MaxColumn, ChangeMaxColumn);
       }
-      BreakBeforeNext = (i == 0) || (Changes[i].NewlinesBefore > 1) ||
-                        (Changes[i].NewlinesBefore == 1 &&
-                         !Changes[i - 1].IsTrailingComment) ||
-                        WasAlignedWithStartOfNextLine;
+      BreakBeforeNext =
+          (i == 0) || (Changes[i].NewlinesBefore > 1) ||
+          // Never start a sequence with a comment at the beginning of
+          // the line.
+          (Changes[i].NewlinesBefore == 1 && StartOfSequence == i);
       Newlines = 0;
     }
   }

Modified: cfe/trunk/unittests/Format/FormatTest.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/unittests/Format/FormatTest.cpp?rev=182608&r1=182607&r2=182608&view=diff
==============================================================================
--- cfe/trunk/unittests/Format/FormatTest.cpp (original)
+++ cfe/trunk/unittests/Format/FormatTest.cpp Thu May 23 15:46:07 2013
@@ -657,6 +657,26 @@ TEST_F(FormatTest, UnderstandsSingleLine
             format("lineWith();   // comment\n"
                    "// at start\n"
                    "otherLine();   // comment"));
+  EXPECT_EQ("lineWith();\n"
+            "// at start\n"
+            "otherLine(); // comment",
+            format("lineWith();\n"
+                   " // at start\n"
+                   "otherLine();   // comment"));
+  EXPECT_EQ("// first\n"
+            "// at start\n"
+            "otherLine(); // comment",
+            format("// first\n"
+                   " // at start\n"
+                   "otherLine();   // comment"));
+  EXPECT_EQ("f();\n"
+            "// first\n"
+            "// at start\n"
+            "otherLine(); // comment",
+            format("f();\n"
+                   "// first\n"
+                   " // at start\n"
+                   "otherLine();   // comment"));
 }
 
 TEST_F(FormatTest, CanFormatCommentsLocally) {