[clang-format][NFC] Clean up nullptr comparison style

For example, use 'Next' instead of 'Next != nullptr',
and '!Next' instead of 'Next == nullptr'.

Differential Revision: https://reviews.llvm.org/D144355

clang/lib/Format/AffectedRangeManager.cpp

@@ -135,7 +135,7 @@ bool AffectedRangeManager::nonPPLineAffected(
                    Line->First->NewlinesBefore == 0;
 
   bool IsContinuedComment =
-      Line->First->is(tok::comment) && Line->First->Next == nullptr &&
+      Line->First->is(tok::comment) && !Line->First->Next &&
       Line->First->NewlinesBefore < 2 && PreviousLine &&
       PreviousLine->Affected && PreviousLine->Last->is(tok::comment);
 

clang/lib/Format/ContinuationIndenter.cpp

@@ -614,7 +614,7 @@ unsigned ContinuationIndenter::addTokenToState(LineState &State, bool Newline,
   State.NoContinuation = false;
 
   if ((Current.is(TT_ImplicitStringLiteral) &&
-       (Previous.Tok.getIdentifierInfo() == nullptr ||
+       (!Previous.Tok.getIdentifierInfo() ||
         Previous.Tok.getIdentifierInfo()->getPPKeywordID() ==
             tok::pp_not_keyword))) {
     unsigned EndColumn =
@@ -1750,11 +1750,11 @@ void ContinuationIndenter::moveStatePastScopeOpener(LineState &State,
   NewState.BreakBeforeParameter = BreakBeforeParameter;
   NewState.HasMultipleNestedBlocks = (Current.BlockParameterCount > 1);
 
-  if (Style.BraceWrapping.BeforeLambdaBody && Current.Next != nullptr &&
+  if (Style.BraceWrapping.BeforeLambdaBody && Current.Next &&
       Current.is(tok::l_paren)) {
     // Search for any parameter that is a lambda.
     FormatToken const *next = Current.Next;
-    while (next != nullptr) {
+    while (next) {
       if (next->is(TT_LambdaLSquare)) {
         NewState.HasMultipleNestedBlocks = true;
         break;
@@ -2169,7 +2169,7 @@ ContinuationIndenter::createBreakableToken(const FormatToken &Current,
         Current, StartColumn, Current.OriginalColumn, !Current.Previous,
         State.Line->InPPDirective, Encoding, Style, Whitespaces.useCRLF());
   } else if (Current.is(TT_LineComment) &&
-             (Current.Previous == nullptr ||
+             (!Current.Previous ||
               Current.Previous->isNot(TT_ImplicitStringLiteral))) {
     bool RegularComments = [&]() {
       for (const FormatToken *T = &Current; T && T->is(TT_LineComment);

clang/lib/Format/Format.cpp

@@ -2454,7 +2454,7 @@ class Cleaner : public TokenAnalyzer {
   }
 
   bool containsOnlyComments(const AnnotatedLine &Line) {
-    for (FormatToken *Tok = Line.First; Tok != nullptr; Tok = Tok->Next)
+    for (FormatToken *Tok = Line.First; Tok; Tok = Tok->Next)
       if (Tok->isNot(tok::comment))
         return false;
     return true;

clang/lib/Format/FormatToken.cpp

@@ -96,7 +96,7 @@ void TokenRole::precomputeFormattingInfos(const FormatToken *Token) {}
 unsigned CommaSeparatedList::formatAfterToken(LineState &State,
                                               ContinuationIndenter *Indenter,
                                               bool DryRun) {
-  if (State.NextToken == nullptr || !State.NextToken->Previous)
+  if (!State.NextToken || !State.NextToken->Previous)
     return 0;
 
   if (Formats.size() == 1)

clang/lib/Format/FormatToken.h

@@ -1556,7 +1556,7 @@ struct AdditionalKeywords {
   /// Returns \c true if \p Tok is a keyword or an identifier.
   bool isWordLike(const FormatToken &Tok) const {
     // getIdentifierinfo returns non-null for keywords as well as identifiers.
-    return Tok.Tok.getIdentifierInfo() != nullptr &&
+    return Tok.Tok.getIdentifierInfo() &&
            !Tok.isOneOf(kw_verilogHash, kw_verilogHashHash, kw_apostrophe);
   }
 
@@ -1719,7 +1719,7 @@ struct AdditionalKeywords {
              VerilogExtraKeywords.end();
     default:
       // getIdentifierInfo returns non-null for both identifiers and keywords.
-      return Tok.Tok.getIdentifierInfo() != nullptr;
+      return Tok.Tok.getIdentifierInfo();
     }
   }
 

clang/lib/Format/TokenAnnotator.cpp

@@ -45,7 +45,7 @@ static bool startsWithInitStatement(const AnnotatedLine &Line) {
 /// invokes @selector(...)). So, we allow treat any identifier or
 /// keyword as a potential Objective-C selector component.
 static bool canBeObjCSelectorComponent(const FormatToken &Tok) {
-  return Tok.Tok.getIdentifierInfo() != nullptr;
+  return Tok.Tok.getIdentifierInfo();
 }
 
 /// With `Left` being '(', check if we're at either `[...](` or
@@ -1314,7 +1314,7 @@ class AnnotatingParser {
           Tok->Next->isNot(tok::l_paren)) {
         Tok->setType(TT_CSharpGenericTypeConstraint);
         parseCSharpGenericTypeConstraint();
-        if (Tok->getPreviousNonComment() == nullptr)
+        if (!Tok->getPreviousNonComment())
           Line.IsContinuation = true;
       }
       break;
@@ -2975,7 +2975,7 @@ void TokenAnnotator::setCommentLineLevels(
 
 static unsigned maxNestingDepth(const AnnotatedLine &Line) {
   unsigned Result = 0;
-  for (const auto *Tok = Line.First; Tok != nullptr; Tok = Tok->Next)
+  for (const auto *Tok = Line.First; Tok; Tok = Tok->Next)
     Result = std::max(Result, Tok->NestingLevel);
   return Result;
 }
@@ -3291,7 +3291,7 @@ void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) const {
 
   calculateUnbreakableTailLengths(Line);
   unsigned IndentLevel = Line.Level;
-  for (Current = Line.First; Current != nullptr; Current = Current->Next) {
+  for (Current = Line.First; Current; Current = Current->Next) {
     if (Current->Role)
       Current->Role->precomputeFormattingInfos(Current);
     if (Current->MatchingParen &&
@@ -3331,10 +3331,10 @@ void TokenAnnotator::calculateArrayInitializerColumnList(
   auto *CurrentToken = Line.First;
   CurrentToken->ArrayInitializerLineStart = true;
   unsigned Depth = 0;
-  while (CurrentToken != nullptr && CurrentToken != Line.Last) {
+  while (CurrentToken && CurrentToken != Line.Last) {
     if (CurrentToken->is(tok::l_brace)) {
       CurrentToken->IsArrayInitializer = true;
-      if (CurrentToken->Next != nullptr)
+      if (CurrentToken->Next)
         CurrentToken->Next->MustBreakBefore = true;
       CurrentToken =
           calculateInitializerColumnList(Line, CurrentToken->Next, Depth + 1);
@@ -3346,14 +3346,14 @@ void TokenAnnotator::calculateArrayInitializerColumnList(
 
 FormatToken *TokenAnnotator::calculateInitializerColumnList(
     AnnotatedLine &Line, FormatToken *CurrentToken, unsigned Depth) const {
-  while (CurrentToken != nullptr && CurrentToken != Line.Last) {
+  while (CurrentToken && CurrentToken != Line.Last) {
     if (CurrentToken->is(tok::l_brace))
       ++Depth;
     else if (CurrentToken->is(tok::r_brace))
       --Depth;
     if (Depth == 2 && CurrentToken->isOneOf(tok::l_brace, tok::comma)) {
       CurrentToken = CurrentToken->Next;
-      if (CurrentToken == nullptr)
+      if (!CurrentToken)
         break;
       CurrentToken->StartsColumn = true;
       CurrentToken = CurrentToken->Previous;

clang/lib/Format/UnwrappedLineFormatter.cpp

@@ -1435,7 +1435,7 @@ void UnwrappedLineFormatter::formatFirstToken(
     Newlines = std::min(Newlines, 1u);
   }
   // Remove empty lines at the start of nested blocks (lambdas/arrow functions)
-  if (PreviousLine == nullptr && Line.Level > 0)
+  if (!PreviousLine && Line.Level > 0)
     Newlines = std::min(Newlines, 1u);
   if (Newlines == 0 && !RootToken.IsFirst)
     Newlines = 1;

clang/lib/Format/UnwrappedLineParser.cpp

@@ -1166,7 +1166,7 @@ static bool mustBeJSIdent(const AdditionalKeywords &Keywords,
                           const FormatToken *FormatTok) {
   // FIXME: This returns true for C/C++ keywords like 'struct'.
   return FormatTok->is(tok::identifier) &&
-         (FormatTok->Tok.getIdentifierInfo() == nullptr ||
+         (!FormatTok->Tok.getIdentifierInfo() ||
           !FormatTok->isOneOf(
               Keywords.kw_in, Keywords.kw_of, Keywords.kw_as, Keywords.kw_async,
               Keywords.kw_await, Keywords.kw_yield, Keywords.kw_finally,

clang/lib/Format/WhitespaceManager.cpp

@@ -1172,7 +1172,7 @@ void WhitespaceManager::alignArrayInitializersRightJustified(
           Changes[CellIter->Index].Spaces = (MaxNetWidth - ThisNetWidth);
         auto RowCount = 1U;
         auto Offset = std::distance(Cells.begin(), CellIter);
-        for (const auto *Next = CellIter->NextColumnElement; Next != nullptr;
+        for (const auto *Next = CellIter->NextColumnElement; Next;
              Next = Next->NextColumnElement) {
           auto *Start = (Cells.begin() + RowCount * CellDescs.CellCounts[0]);
           auto *End = Start + Offset;
@@ -1191,7 +1191,7 @@ void WhitespaceManager::alignArrayInitializersRightJustified(
         Changes[CellIter->Index].Spaces += (i > 0) ? 1 : 0;
       }
       alignToStartOfCell(CellIter->Index, CellIter->EndIndex);
-      for (const auto *Next = CellIter->NextColumnElement; Next != nullptr;
+      for (const auto *Next = CellIter->NextColumnElement; Next;
            Next = Next->NextColumnElement) {
         ThisWidth =
             calculateCellWidth(Next->Index, Next->EndIndex, true) + NetWidth;
@@ -1233,7 +1233,7 @@ void WhitespaceManager::alignArrayInitializersLeftJustified(
     }
     auto RowCount = 1U;
     auto Offset = std::distance(Cells.begin(), CellIter);
-    for (const auto *Next = CellIter->NextColumnElement; Next != nullptr;
+    for (const auto *Next = CellIter->NextColumnElement; Next;
          Next = Next->NextColumnElement) {
       if (RowCount > CellDescs.CellCounts.size())
         break;
@@ -1253,7 +1253,7 @@ void WhitespaceManager::alignArrayInitializersLeftJustified(
 bool WhitespaceManager::isSplitCell(const CellDescription &Cell) {
   if (Cell.HasSplit)
     return true;
-  for (const auto *Next = Cell.NextColumnElement; Next != nullptr;
+  for (const auto *Next = Cell.NextColumnElement; Next;
        Next = Next->NextColumnElement) {
     if (Next->HasSplit)
       return true;
@@ -1406,8 +1406,7 @@ WhitespaceManager::CellDescriptions
 WhitespaceManager::linkCells(CellDescriptions &&CellDesc) {
   auto &Cells = CellDesc.Cells;
   for (auto *CellIter = Cells.begin(); CellIter != Cells.end(); ++CellIter) {
-    if (CellIter->NextColumnElement == nullptr &&
-        ((CellIter + 1) != Cells.end())) {
+    if (!CellIter->NextColumnElement && (CellIter + 1) != Cells.end()) {
       for (auto *NextIter = CellIter + 1; NextIter != Cells.end(); ++NextIter) {
         if (NextIter->Cell == CellIter->Cell) {
           CellIter->NextColumnElement = &(*NextIter);

clang/lib/Format/WhitespaceManager.h

@@ -294,7 +294,7 @@ class WhitespaceManager {
         calculateCellWidth(CellIter->Index, CellIter->EndIndex, true);
     if (Changes[CellIter->Index].NewlinesBefore == 0)
       CellWidth += NetWidth;
-    for (const auto *Next = CellIter->NextColumnElement; Next != nullptr;
+    for (const auto *Next = CellIter->NextColumnElement; Next;
          Next = Next->NextColumnElement) {
       auto ThisWidth = calculateCellWidth(Next->Index, Next->EndIndex, true);
       if (Changes[Next->Index].NewlinesBefore == 0)
@@ -312,7 +312,7 @@ class WhitespaceManager {
     auto MaxNetWidth = getNetWidth(CellStart, CellStop, InitialSpaces);
     auto RowCount = 1U;
     auto Offset = std::distance(CellStart, CellStop);
-    for (const auto *Next = CellStop->NextColumnElement; Next != nullptr;
+    for (const auto *Next = CellStop->NextColumnElement; Next;
          Next = Next->NextColumnElement) {
       if (RowCount > MaxRowCount)
         break;