[clang] [clang-format] Option to ignore macro definitions (PR #70338)

[Owen Pan via cfe-commits]

================
@@ -24153,6 +24153,123 @@ TEST_F(FormatTest, WhitespaceSensitiveMacros) {
   verifyNoChange("FOO(String-ized&Messy+But: :Still=Intentional);", Style);
 }
 
+TEST_F(FormatTest, IgnorePPDefinitions) {
+  FormatStyle Style = getLLVMStyle();
+  Style.IgnorePPDefinitions = true;
+
+  verifyNoChange("#define  A", Style);
+  verifyNoChange("#define A   b", Style);
+  verifyNoChange("#define A  (  args   )", Style);
+  verifyNoChange("#define A  (  args   )  =  func  (  args  )", Style);
+
+  verifyNoChange("#define A x:", Style);
+  verifyNoChange("#define A a. b", Style);
+
+  // Surrounded with formatted code.
+  verifyFormat("int a;\n"
+               "#define  A  a\n"
+               "int a;",
+               "int  a ;\n"
+               "#define  A  a\n"
+               "int  a ;",
+               Style);
+
+  // Columns are not broken when a limit is set.
+  Style.ColumnLimit = 10;
+  verifyNoChange("#define A a a a a", Style);
+
+  Style.ColumnLimit = 15;
+  verifyNoChange("#define A //a very long comment", Style);
+  // in the following examples, since second line will not be formtted, it won't
+  // take into considertaion the alignment from the first line. The third line
+  // will follow the second line's alignment.
+  verifyFormat("int aaaaaa; // a\n"
+               "#define A // a\n"
+               "int a;    // a",
+               "int aaaaaa; // a\n"
+               "#define A // a\n"
+               "int a; // a",
+               Style);
+
+  Style.ColumnLimit = 0;
+
+  // Multiline definition.
+  verifyNoChange("#define A \\\n"
+                 "Line one with spaces  .  \\\n"
+                 " Line two.",
+                 Style);
+  verifyNoChange("#define A \\\n"
+                 "a a \\\n"
+                 "a        \\\n"
+                 "a",
+                 Style);
+  Style.AlignEscapedNewlines = FormatStyle::ENAS_Left;
+  verifyNoChange("#define A \\\n"
+                 "a a \\\n"
+                 "a        \\\n"
+                 "a",
+                 Style);
+  Style.AlignEscapedNewlines = FormatStyle::ENAS_Right;
+  verifyNoChange("#define A \\\n"
+                 "a a \\\n"
+                 "a        \\\n"
+                 "a",
+                 Style);
+
+  // Adjust indendations but don't change the definition.
+  Style.IndentPPDirectives = FormatStyle::PPDIS_None;
+  verifyNoChange("#if A\n"
+                 "#define A  a\n"
+                 "#endif",
+                 Style);
+  verifyNoChange("#define UNITY 1\n"
+                 "#if A\n"
+                 "#  define   A  a\\\n"
+                 "  a  a\n"
+                 "#endif",
+                 Style);
+  verifyFormat("#if A\n"
+               "#define A  a\n"
+               "#endif",
+               "#if A\n"
+               "  #define A  a\n"
+               "#endif",
+               Style);
+  Style.IndentPPDirectives = FormatStyle::PPDIS_AfterHash;
+  verifyFormat("#if A\n"
+               "#  define A  a\n"
----------------
owenca wrote:

Ditto.

https://github.com/llvm/llvm-project/pull/70338