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clang-format: Prefer column layout if possible. 

Add a severe penalty for not using column layout for braced lists. If
there are solutions with column layout, these are generally preferable
over bin-packed solutions.

Before:
  std::vector<MyValues> aaaaaaaaaaaaaaaaaaa{ aaaaaaa, aaaaaaaaaa, aaaaa,
                                             aaaaaaaaaaaaaaa, aaa, aaaaaaaaaa, a,
                                             aaaaaaaaaaaaaaaaaaaaa, aaaaaaaaaaaa,
                                             aaaaaaaaaaaaaaaaaaa +
                                                 aaaaaaaaaaaaaaaaaaa,
                                             aaaaaaa, a };
After:
  std::vector<MyValues> aaaaaaaaaaaaaaaaaaa{
    aaaaaaa,      aaaaaaaaaa,
    aaaaa,        aaaaaaaaaaaaaaa,
    aaa,          aaaaaaaaaa,
    a,            aaaaaaaaaaaaaaaaaaaaa,
    aaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaaaaa,
    aaaaaaa,      a
  };

llvm-svn: 195546
This commit is contained in:
Daniel Jasper 2013-11-23 10:22:59 +00:00
parent 556f03ef90
commit 1a1a2ab77e
2 changed files with 12 additions and 1 deletions
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5
clang/lib/Format/FormatToken.cpp
View File

@ -48,8 +48,11 @@ unsigned CommaSeparatedList::format(LineState &State,
// Find the best ColumnFormat, i.e. the best number of columns to use.
const ColumnFormat *Format = getColumnFormat(RemainingCodePoints);
// If no ColumnFormat can be used, the braced list would generally be
// bin-packed. Add a severe penalty to this so that column layouts are
// prefered if possible.
if (!Format)
return 0;
return 10000;
// Format the entire list.
unsigned Penalty = 0;

8
clang/unittests/Format/FormatTest.cpp
View File

@ -4698,6 +4698,14 @@ TEST_F(FormatTest, LayoutCxx11ConstructorBraceInitializers) {
verifyFormat(
"std::this_thread::sleep_for(\n"
" std::chrono::nanoseconds{ std::chrono::seconds{ 1 } } / 5);");
verifyFormat("std::vector<MyValues> aaaaaaaaaaaaaaaaaaa{\n"
" aaaaaaa, aaaaaaaaaa,\n"
" aaaaa, aaaaaaaaaaaaaaa,\n"
" aaa, aaaaaaaaaa,\n"
" a, aaaaaaaaaaaaaaaaaaaaa,\n"
" aaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaaaaa,\n"
" aaaaaaa, a\n"
"};");
FormatStyle NoSpaces = getLLVMStyle();
NoSpaces.Cpp11BracedListStyle = true;