[clang] [clang-format] Add option AllowShortRecordOnASingleLine (PR #154580)

[Tomáš Slanina via cfe-commits]

================
@@ -15277,6 +15290,123 @@ TEST_F(FormatTest, NeverMergeShortRecords) {
                Style);
 }
 
+TEST_F(FormatTest, AllowShortRecordOnASingleLineNonSplit) {
+  FormatStyle Style = getLLVMStyle();
+
+  Style.BreakBeforeBraces = FormatStyle::BS_Custom;
+  Style.BraceWrapping.SplitEmptyRecord = false;
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_Never;
+  verifyFormat("class foo {\n"
+               "  void bar();\n"
+               "};",
+               Style);
+  verifyFormat("class foo {\n};", Style);
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_EmptyIfAttached;
+  verifyFormat("class foo {\n"
+               "  void bar();\n"
+               "};",
+               Style);
+  verifyFormat("class foo {};", Style);
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_Empty;
+  verifyFormat("class foo {\n"
+               "  void bar();\n"
+               "};",
+               Style);
+  verifyFormat("class foo {};", Style);
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_Always;
+  verifyFormat("class foo { void bar(); };", Style);
+  verifyFormat("class foo {};", Style);
+
+  Style.BraceWrapping.AfterClass = true;
+  Style.BraceWrapping.AfterStruct = true;
+  Style.BraceWrapping.AfterUnion = true;
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_Never;
+  verifyFormat("class foo\n{\n"
+               "  void bar();\n"
+               "};",
+               Style);
+  verifyFormat("class foo\n{};", Style);
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_EmptyIfAttached;
+  verifyFormat("class foo\n{\n"
+               "  void bar();\n"
+               "};",
+               Style);
+  verifyFormat("class foo\n{};", Style);
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_Empty;
+  verifyFormat("class foo\n{\n"
+               "  void bar();\n"
+               "};",
+               Style);
+  verifyFormat("class foo {};", Style);
+
+  Style.AllowShortRecordOnASingleLine = FormatStyle::SRS_Always;
+  verifyFormat("class foo { void bar(); };", Style);
+  verifyFormat("class foo {};", Style);
+}
+
+TEST_F(FormatTest, AllowShortRecordOnASingleLineSplit) {
+  FormatStyle Style = getLLVMStyle();
+
+  Style.BreakBeforeBraces = FormatStyle::BS_Custom;
+  Style.BraceWrapping.SplitEmptyRecord = true;
----------------
itzexpoexpo wrote:

Again, why check for SplitEmptyRecord mid-test if the entire test requires it 
set to true

https://github.com/llvm/llvm-project/pull/154580
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