[PATCH] D115803: [clang-format] Fix tabs when using BreakBeforeTernaryOperators=false.

[Marek Kurdej via Phabricator via cfe-commits]

curdeius created this revision.
curdeius added reviewers: MyDeveloperDay, HazardyKnusperkeks, owenpan.
curdeius requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Fixes https://github.com/llvm/llvm-project/issues/52724.

This is rather a workaround than a correct fix. To properly fix it, we'd need to find a better way to tell when not to decrease the StartOfTokenColumn.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115803

Files:
  clang/lib/Format/WhitespaceManager.cpp
  clang/unittests/Format/FormatTest.cpp


Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -13452,6 +13452,25 @@
                    "}",
                    Tab));
 
+  verifyFormat("void f() {\n"
+               "\treturn true ? aaaaaaaaaaaaaaaaaa\n"
+               "\t            : bbbbbbbbbbbbbbbbbb\n"
+               "}",
+               Tab);
+  FormatStyle TabNoBreak = Tab;
+  TabNoBreak.BreakBeforeTernaryOperators = false;
+  verifyFormat("void f() {\n"
+               "\treturn true ? aaaaaaaaaaaaaaaaaa :\n"
+               "\t              bbbbbbbbbbbbbbbbbb\n"
+               "}",
+               TabNoBreak);
+  verifyFormat("void f() {\n"
+               "\treturn true ?\n"
+               "\t           aaaaaaaaaaaaaaaaaaaa :\n"
+               "\t           bbbbbbbbbbbbbbbbbbbb\n"
+               "}",
+               TabNoBreak);
+
   Tab.UseTab = FormatStyle::UT_Never;
   EXPECT_EQ("/*\n"
             "              a\t\tcomment\n"
Index: clang/lib/Format/WhitespaceManager.cpp
===================================================================
--- clang/lib/Format/WhitespaceManager.cpp
+++ clang/lib/Format/WhitespaceManager.cpp
@@ -1282,9 +1282,12 @@
                                  C.EscapedNewlineColumn);
       else
         appendNewlineText(ReplacementText, C.NewlinesBefore);
+      // FIXME: This assert should hold if we computed the column correctly.
+      // assert((int)C.StartOfTokenColumn >= C.Spaces);
       appendIndentText(
           ReplacementText, C.Tok->IndentLevel, std::max(0, C.Spaces),
-          C.StartOfTokenColumn - std::max(0, C.Spaces), C.IsAligned);
+          std::max((int)C.StartOfTokenColumn, C.Spaces) - std::max(0, C.Spaces),
+          C.IsAligned);
       ReplacementText.append(C.CurrentLinePrefix);
       storeReplacement(C.OriginalWhitespaceRange, ReplacementText);
     }


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