[clang-format] Handle PointerAlignment in if and switch statements with initializers (C++17) the same way as in for loops.

Reviewed By: MyDeveloperDay, owenpan

Differential Revision: https://reviews.llvm.org/D119650

Author: mkurdej

clang/lib/Format/TokenAnnotator.cpp

@@ -26,6 +26,13 @@ namespace format {
 
 namespace {
 
+/// Returns \c true if the line starts with a token that can start a statement
+/// with an initializer.
+static bool startsWithInitStatement(const AnnotatedLine &Line) {
+  return Line.startsWith(tok::kw_for) || Line.startsWith(tok::kw_if) ||
+         Line.startsWith(tok::kw_switch);
+}
+
 /// Returns \c true if the token can be used as an identifier in
 /// an Objective-C \c \@selector, \c false otherwise.
 ///
@@ -1135,7 +1142,7 @@ class AnnotatingParser {
       else if (Contexts.back().InInheritanceList)
         Tok->setType(TT_InheritanceComma);
       else if (Contexts.back().FirstStartOfName &&
-               (Contexts.size() == 1 || Line.startsWith(tok::kw_for))) {
+               (Contexts.size() == 1 || startsWithInitStatement(Line))) {
         Contexts.back().FirstStartOfName->PartOfMultiVariableDeclStmt = true;
         Line.IsMultiVariableDeclStmt = true;
       }
@@ -3090,7 +3097,7 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
                 FormatStyle::PAS_Left ||
             (Line.IsMultiVariableDeclStmt &&
              (Left.NestingLevel == 0 ||
-              (Left.NestingLevel == 1 && Line.First->is(tok::kw_for)))));
+              (Left.NestingLevel == 1 && startsWithInitStatement(Line)))));
   }
   if (Right.is(TT_FunctionTypeLParen) && Left.isNot(tok::l_paren) &&
       (!Left.is(TT_PointerOrReference) ||

clang/unittests/Format/FormatTest.cpp

@@ -8396,6 +8396,12 @@ TEST_F(FormatTest, DeclarationsOfMultipleVariables) {
                Style);
   verifyFormat("vector<int*> a, b;", Style);
   verifyFormat("for (int *p, *q; p != q; p = p->next) {\n}", Style);
+  verifyFormat("/*comment*/ for (int *p, *q; p != q; p = p->next) {\n}", Style);
+  verifyFormat("if (int *p, *q; p != q) {\n  p = p->next;\n}", Style);
+  verifyFormat("/*comment*/ if (int *p, *q; p != q) {\n  p = p->next;\n}",
+               Style);
+  verifyFormat("switch (int *p, *q; p != q) {\n  default:\n    break;\n}", Style);
+  verifyFormat("/*comment*/ switch (int *p, *q; p != q) {\n  default:\n    break;\n}", Style);
 }
 
 TEST_F(FormatTest, ConditionalExpressionsInBrackets) {