[PATCH] D28844: clang-format: fix fallback style set to "none" not formatting

[Antonio Maiorano via Phabricator via cfe-commits]

amaiorano created this revision.

This change fixes the fact that fallback style set to "none" should not format. Without this change, fallback style "none" ends up applying LLVM formatting.


https://reviews.llvm.org/D28844

Files:
  lib/Format/Format.cpp
  test/Format/style-on-command-line.cpp
  unittests/Format/FormatTest.cpp


Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -10978,13 +10978,18 @@
   ASSERT_TRUE((bool)Style1);
   ASSERT_EQ(*Style1, getLLVMStyle());
 
-  // Test 2: fallback to default.
+  // Test 2.1: fallback to default.
   ASSERT_TRUE(
       FS.addFile("/b/test.cpp", 0, llvm::MemoryBuffer::getMemBuffer("int i;")));
   auto Style2 = getStyle("file", "/b/test.cpp", "Mozilla", "", &FS);
   ASSERT_TRUE((bool)Style2);
   ASSERT_EQ(*Style2, getMozillaStyle());
 
+  // Test 2.2: no format on 'none' fallback style.
+  Style2 = getStyle("file", "/b/test.cpp", "none", "", &FS);
+  ASSERT_TRUE((bool)Style2);
+  ASSERT_EQ(*Style2, getNoStyle());
+
   // Test 3: format file in parent directory.
   ASSERT_TRUE(
       FS.addFile("/c/.clang-format", 0,
Index: test/Format/style-on-command-line.cpp
===================================================================
--- test/Format/style-on-command-line.cpp
+++ test/Format/style-on-command-line.cpp
@@ -11,6 +11,10 @@
 // RUN: clang-format -style=file -assume-filename=%T/foo.cpp < %s | FileCheck -strict-whitespace -check-prefix=CHECK7 %s
 // RUN: clang-format -style="{BasedOnStyle: LLVM, PointerBindsToType: true}" %s | FileCheck -strict-whitespace -check-prefix=CHECK8 %s
 // RUN: clang-format -style="{BasedOnStyle: WebKit, PointerBindsToType: false}" %s | FileCheck -strict-whitespace -check-prefix=CHECK9 %s
+// RUN: rm %T/_clang-format
+// RUN: clang-format -style=file -fallback-style=WebKit -assume-filename=%T/foo.cpp < %s 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK10 %s
+// RUN: clang-format -style=file -assume-filename=%T/foo.cpp < %s 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK11 %s
+// RUN: clang-format -style=file -fallback-style=none -assume-filename=%T/foo.cpp < %s 2>&1 | FileCheck -strict-whitespace -check-prefix=CHECK12 %s
 void f() {
 // CHECK1: {{^        int\* i;$}}
 // CHECK2: {{^       int \*i;$}}
@@ -22,6 +26,9 @@
 // CHECK7: {{^      int\* i;$}}
 // CHECK8: {{^  int\* i;$}}
 // CHECK9: {{^    int \*i;$}}
+// CHECK10: {{^    int\* i;$}}
+// CHECK11: {{^  int \*i;$}}
+// CHECK12: {{^int\*i;$}}
 int*i;
 int j;
 }
Index: lib/Format/Format.cpp
===================================================================
--- lib/Format/Format.cpp
+++ lib/Format/Format.cpp
@@ -1888,8 +1888,8 @@
 }
 
 llvm::Expected<FormatStyle> getStyle(StringRef StyleName, StringRef FileName,
-                                     StringRef FallbackStyle, StringRef Code,
-                                     vfs::FileSystem *FS) {
+                                     StringRef FallbackStyleName,
+                                     StringRef Code, vfs::FileSystem *FS) {
   if (!FS) {
     FS = vfs::getRealFileSystem().get();
   }
@@ -1903,9 +1903,9 @@
       (Code.contains("\n- (") || Code.contains("\n+ (")))
     Style.Language = FormatStyle::LK_ObjC;
 
-  // FIXME: If FallbackStyle is explicitly "none", format is disabled.
-  if (!getPredefinedStyle(FallbackStyle, Style.Language, &Style))
-    return make_string_error("Invalid fallback style \"" + FallbackStyle.str());
+  FormatStyle FallbackStyle = getNoStyle();
+  if (!getPredefinedStyle(FallbackStyleName, Style.Language, &FallbackStyle))
+    return make_string_error("Invalid fallback style \"" + FallbackStyleName);
 
   if (StyleName.startswith("{")) {
     // Parse YAML/JSON style from the command line.
@@ -1977,7 +1977,7 @@
     return make_string_error("Configuration file(s) do(es) not support " +
                              getLanguageName(Style.Language) + ": " +
                              UnsuitableConfigFiles);
-  return Style;
+  return FallbackStyle;
 }
 
 } // namespace format


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