Optionally derive formatting information from the input file.

With this patch, clang-format can analyze the input file for two
properties:
1. Is "int *a" or "int* a" more common.
2. Are non-C++03 constructs used, e.g. A<A<A>>.

With Google-style, clang-format will now use the more common style for
(1) and format C++03 compatible, unless it finds C++11 constructs in the
input.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174504 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index f5250bc4df..0f469836f5 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -1437,6 +1437,11 @@ TEST_F(FormatTest, UnderstandsTemplateParameters) {
   verifyGoogleFormat("A<A<int>> a;");
   verifyGoogleFormat("A<A<A<int>>> a;");
   verifyGoogleFormat("A<A<A<A<int>>>> a;");
+  verifyGoogleFormat("A<A<int> > a;");
+  verifyGoogleFormat("A<A<A<int> > > a;");
+  verifyGoogleFormat("A<A<A<A<int> > > > a;");
+  EXPECT_EQ("A<A<A<A>>> a;", format("A<A<A<A> >> a;", getGoogleStyle()));
+  EXPECT_EQ("A<A<A<A>>> a;", format("A<A<A<A>> > a;", getGoogleStyle()));
 
   verifyFormat("test >> a >> b;");
   verifyFormat("test << a >> b;");
@@ -1597,6 +1602,22 @@ TEST_F(FormatTest, UnderstandsUsesOfStarAndAmp) {
 
   verifyIndependentOfContext("A = new SomeType *[Length]();");
   verifyGoogleFormat("A = new SomeType* [Length]();");
+
+  EXPECT_EQ("int *a;\n"
+            "int *a;\n"
+            "int *a;", format("int *a;\n"
+                              "int* a;\n"
+                              "int *a;", getGoogleStyle()));
+  EXPECT_EQ("int* a;\n"
+            "int* a;\n"
+            "int* a;", format("int* a;\n"
+                              "int* a;\n"
+                              "int *a;", getGoogleStyle()));
+  EXPECT_EQ("int *a;\n"
+            "int *a;\n"
+            "int *a;", format("int *a;\n"
+                              "int * a;\n"
+                              "int *  a;", getGoogleStyle()));
 }
 
 TEST_F(FormatTest, FormatsBinaryOperatorsPrecedingEquals) {