[clang-format[NFC] Clean up AnnotatingParser::rParenEndsCast() (#96128)

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -2661,18 +2661,27 @@ class AnnotatingParser {
 
   /// Determine whether ')' is ending a cast.
   bool rParenEndsCast(const FormatToken &Tok) {
+    assert(Tok.is(tok::r_paren));
+
+    if (!Tok.MatchingParen || !Tok.Previous)
+      return false;
+
     // C-style casts are only used in C++, C# and Java.
-    if (!Style.isCSharp() && !IsCpp && Style.Language != FormatStyle::LK_Java)
+    if (!IsCpp && !Style.isCSharp() && Style.Language != FormatStyle::LK_Java)
       return false;
 
+    const auto *LParen = Tok.MatchingParen;
+    const auto *BeforeRParen = Tok.Previous;
+    const auto *AfterRParen = Tok.Next;
+
     // Empty parens aren't casts and there are no casts at the end of the line.
-    if (Tok.Previous == Tok.MatchingParen || !Tok.Next || !Tok.MatchingParen)
+    if (BeforeRParen == LParen || !AfterRParen)
       return false;
 
-    if (Tok.MatchingParen->is(TT_OverloadedOperatorLParen))
+    if (LParen->is(TT_OverloadedOperatorLParen))
       return false;
 
-    FormatToken *LeftOfParens = Tok.MatchingParen->getPreviousNonComment();
+    auto *LeftOfParens = LParen->getPreviousNonComment();
     if (LeftOfParens) {
       // If there is a closing parenthesis left of the current
       // parentheses, look past it as these might be chained casts.
@@ -2728,37 +2737,38 @@ class AnnotatingParser {
       }
     }
 
-    if (Tok.Next->is(tok::question) ||
-        (Tok.Next->is(tok::ampamp) && !Tok.Previous->isTypeName(LangOpts))) {
+    if (AfterRParen->is(tok::question) ||
+        (AfterRParen->is(tok::ampamp) && !BeforeRParen->isTypeName(LangOpts))) {
       return false;
     }
 
     // `foreach((A a, B b) in someList)` should not be seen as a cast.
-    if (Tok.Next->is(Keywords.kw_in) && Style.isCSharp())
+    if (AfterRParen->is(Keywords.kw_in) && Style.isCSharp())
       return false;
 
     // Functions which end with decorations like volatile, noexcept are unlikely
     // to be casts.
-    if (Tok.Next->isOneOf(tok::kw_noexcept, tok::kw_volatile, tok::kw_const,
-                          tok::kw_requires, tok::kw_throw, tok::arrow,
-                          Keywords.kw_override, Keywords.kw_final) ||
-        isCppAttribute(IsCpp, *Tok.Next)) {
+    if (AfterRParen->isOneOf(tok::kw_noexcept, tok::kw_volatile, tok::kw_const,
+                             tok::kw_requires, tok::kw_throw, tok::arrow,
+                             Keywords.kw_override, Keywords.kw_final) ||
+        isCppAttribute(IsCpp, *AfterRParen)) {
       return false;
     }
 
     // As Java has no function types, a "(" after the ")" likely means that this
     // is a cast.
-    if (Style.Language == FormatStyle::LK_Java && Tok.Next->is(tok::l_paren))
+    if (Style.Language == FormatStyle::LK_Java && AfterRParen->is(tok::l_paren))
       return true;
 
     // If a (non-string) literal follows, this is likely a cast.
-    if (Tok.Next->isOneOf(tok::kw_sizeof, tok::kw_alignof) ||
-        (Tok.Next->Tok.isLiteral() && Tok.Next->isNot(tok::string_literal))) {
+    if (AfterRParen->isOneOf(tok::kw_sizeof, tok::kw_alignof) ||
+        (AfterRParen->Tok.isLiteral() &&
+         AfterRParen->isNot(tok::string_literal))) {
       return true;
     }
 
     // Heuristically try to determine whether the parentheses contain a type.
-    auto IsQualifiedPointerOrReference = [](FormatToken *T,
+    auto IsQualifiedPointerOrReference = [](const FormatToken *T,
                                             const LangOptions &LangOpts) {
       // This is used to handle cases such as x = (foo *const)&y;
       assert(!T->isTypeName(LangOpts) && "Should have already been checked");
@@ -2791,12 +2801,11 @@ class AnnotatingParser {
       return T && T->is(TT_PointerOrReference);
     };
     bool ParensAreType =
-        !Tok.Previous ||
-        Tok.Previous->isOneOf(TT_TemplateCloser, TT_TypeDeclarationParen) ||
-        Tok.Previous->isTypeName(LangOpts) ||
-        IsQualifiedPointerOrReference(Tok.Previous, LangOpts);
+        BeforeRParen->isOneOf(TT_TemplateCloser, TT_TypeDeclarationParen) ||
+        BeforeRParen->isTypeName(LangOpts) ||
+        IsQualifiedPointerOrReference(BeforeRParen, LangOpts);
     bool ParensCouldEndDecl =
-        Tok.Next->isOneOf(tok::equal, tok::semi, tok::l_brace, tok::greater);
+        AfterRParen->isOneOf(tok::equal, tok::semi, tok::l_brace, tok::greater);
     if (ParensAreType && !ParensCouldEndDecl)
       return true;
 
@@ -2808,49 +2817,49 @@ class AnnotatingParser {
 
     // Certain token types inside the parentheses mean that this can't be a
     // cast.
-    for (const FormatToken *Token = Tok.MatchingParen->Next; Token != &Tok;
-         Token = Token->Next) {
+    for (const auto *Token = LParen->Next; Token != &Tok; Token = Token->Next)
       if (Token->is(TT_BinaryOperator))
         return false;
-    }
 
     // If the following token is an identifier or 'this', this is a cast. All
     // cases where this can be something else are handled above.
-    if (Tok.Next->isOneOf(tok::identifier, tok::kw_this))
+    if (AfterRParen->isOneOf(tok::identifier, tok::kw_this))
       return true;
 
     // Look for a cast `( x ) (`.
-    if (Tok.Next->is(tok::l_paren) && Tok.Previous && Tok.Previous->Previous) {
-      if (Tok.Previous->is(tok::identifier) &&
-          Tok.Previous->Previous->is(tok::l_paren)) {
+    if (AfterRParen->is(tok::l_paren) && BeforeRParen->Previous) {
+      if (BeforeRParen->is(tok::identifier) &&
+          BeforeRParen->Previous->is(tok::l_paren)) {
         return true;
       }
     }
 
-    if (!Tok.Next->Next)
+    if (!AfterRParen->Next)
       return false;
 
     // If the next token after the parenthesis is a unary operator, assume
     // that this is cast, unless there are unexpected tokens inside the
     // parenthesis.
-    const bool NextIsAmpOrStar = Tok.Next->isOneOf(tok::amp, tok::star);
-    if (!(Tok.Next->isUnaryOperator() || NextIsAmpOrStar) ||
-        Tok.Next->is(tok::plus) ||
-        !Tok.Next->Next->isOneOf(tok::identifier, tok::numeric_constant)) {
+    const bool NextIsAmpOrStar = AfterRParen->isOneOf(tok::amp, tok::star);
+    if (!(AfterRParen->isUnaryOperator() || NextIsAmpOrStar) ||
+        AfterRParen->is(tok::plus) ||
+        !AfterRParen->Next->isOneOf(tok::identifier, tok::numeric_constant)) {
       return false;
     }
+
     if (NextIsAmpOrStar &&
-        (Tok.Next->Next->is(tok::numeric_constant) || Line.InPPDirective)) {
+        (AfterRParen->Next->is(tok::numeric_constant) || Line.InPPDirective)) {
       return false;
     }
-    if (Line.InPPDirective && Tok.Next->is(tok::minus))
+
+    if (Line.InPPDirective && AfterRParen->is(tok::minus))
       return false;
+
     // Search for unexpected tokens.
-    for (FormatToken *Prev = Tok.Previous; Prev != Tok.MatchingParen;
-         Prev = Prev->Previous) {
+    for (auto *Prev = BeforeRParen; Prev != LParen; Prev = Prev->Previous)
       if (!Prev->isOneOf(tok::kw_const, tok::identifier, tok::coloncolon))
         return false;
-    }
+
     return true;
   }