/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/clang/lib/Format/TokenAnnotator.cpp

Bug Summary

File:	clang/lib/Format/TokenAnnotator.cpp
Warning:	line 2380, column 28 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name TokenAnnotator.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Format -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/clang/lib/Format -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/clang/include -I tools/clang/include -I include -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm=build-llvm -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm=build-llvm -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm=build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-01-19-134126-35450-1 -x c++ /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/clang/lib/Format/TokenAnnotator.cpp
1//===--- TokenAnnotator.cpp - Format C++ code -----------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This file implements a token annotator, i.e. creates
11/// \c AnnotatedTokens out of \c FormatTokens with required extra information.
12///
13//===----------------------------------------------------------------------===//

15#include "TokenAnnotator.h"
16#include "FormatToken.h"
17#include "clang/Basic/SourceManager.h"
18#include "clang/Basic/TokenKinds.h"
19#include "llvm/ADT/SmallPtrSet.h"
20#include "llvm/Support/Debug.h"

22#define DEBUG_TYPE"format-token-annotator" "format-token-annotator"

24namespace clang {
25namespace format {

27namespace {

29/// Returns \c true if the token can be used as an identifier in
30/// an Objective-C \c \@selector, \c false otherwise.
31///
32/// Because getFormattingLangOpts() always lexes source code as
33/// Objective-C++, C++ keywords like \c new and \c delete are
34/// lexed as tok::kw_*, not tok::identifier, even for Objective-C.
35///
36/// For Objective-C and Objective-C++, both identifiers and keywords
37/// are valid inside @selector(...) (or a macro which
38/// invokes @selector(...)). So, we allow treat any identifier or
39/// keyword as a potential Objective-C selector component.
40static bool canBeObjCSelectorComponent(const FormatToken &Tok) {
return Tok.Tok.getIdentifierInfo() != nullptr;
42}

44/// With `Left` being '(', check if we're at either `[...](` or
45/// `[...]<...>(`, where the [ opens a lambda capture list.
46static bool isLambdaParameterList(const FormatToken *Left) {
// Skip <...> if present.
if (Left->Previous && Left->Previous->is(tok::greater) &&
    Left->Previous->MatchingParen &&
    Left->Previous->MatchingParen->is(TT_TemplateOpener))
  Left = Left->Previous->MatchingParen;

// Check for `[...]`.
return Left->Previous && Left->Previous->is(tok::r_square) &&
       Left->Previous->MatchingParen &&
       Left->Previous->MatchingParen->is(TT_LambdaLSquare);
57}

59/// Returns \c true if the token is followed by a boolean condition, \c false
60/// otherwise.
61static bool isKeywordWithCondition(const FormatToken &Tok) {
return Tok.isOneOf(tok::kw_if, tok::kw_for, tok::kw_while, tok::kw_switch,
                   tok::kw_constexpr, tok::kw_catch);
64}

66/// A parser that gathers additional information about tokens.
67///
68/// The \c TokenAnnotator tries to match parenthesis and square brakets and
69/// store a parenthesis levels. It also tries to resolve matching "<" and ">"
70/// into template parameter lists.
71class AnnotatingParser {
72public:
AnnotatingParser(const FormatStyle &Style, AnnotatedLine &Line,
                 const AdditionalKeywords &Keywords)
    : Style(Style), Line(Line), CurrentToken(Line.First), AutoFound(false),
      Keywords(Keywords) {
  Contexts.push_back(Context(tok::unknown, 1, /*IsExpression=*/false));
  resetTokenMetadata();
}

81private:
bool parseAngle() {
  if (!CurrentToken || !CurrentToken->Previous)
    return false;
  if (NonTemplateLess.count(CurrentToken->Previous))
    return false;

  const FormatToken &Previous = *CurrentToken->Previous; // The '<'.
  if (Previous.Previous) {
    if (Previous.Previous->Tok.isLiteral())
      return false;
    if (Previous.Previous->is(tok::r_paren) && Contexts.size() > 1 &&
        (!Previous.Previous->MatchingParen ||
         !Previous.Previous->MatchingParen->is(TT_OverloadedOperatorLParen)))
      return false;
  }

  FormatToken *Left = CurrentToken->Previous;
  Left->ParentBracket = Contexts.back().ContextKind;
  ScopedContextCreator ContextCreator(*this, tok::less, 12);

  // If this angle is in the context of an expression, we need to be more
  // hesitant to detect it as opening template parameters.
  bool InExprContext = Contexts.back().IsExpression;

  Contexts.back().IsExpression = false;
  // If there's a template keyword before the opening angle bracket, this is a
  // template parameter, not an argument.
  Contexts.back().InTemplateArgument =
      Left->Previous && Left->Previous->Tok.isNot(tok::kw_template);

  if (Style.Language == FormatStyle::LK_Java &&
      CurrentToken->is(tok::question))
    next();

  while (CurrentToken) {
    if (CurrentToken->is(tok::greater)) {
      // Try to do a better job at looking for ">>" within the condition of
      // a statement. Conservatively insert spaces between consecutive ">"
      // tokens to prevent splitting right bitshift operators and potentially
      // altering program semantics. This check is overly conservative and
      // will prevent spaces from being inserted in select nested template
      // parameter cases, but should not alter program semantics.
      if (CurrentToken->Next && CurrentToken->Next->is(tok::greater) &&
          Left->ParentBracket != tok::less &&
          (isKeywordWithCondition(*Line.First) ||
           CurrentToken->getStartOfNonWhitespace() ==
               CurrentToken->Next->getStartOfNonWhitespace().getLocWithOffset(
                   -1)))
        return false;
      Left->MatchingParen = CurrentToken;
      CurrentToken->MatchingParen = Left;
      // In TT_Proto, we must distignuish between:
      //   map<key, value>
      //   msg < item: data >
      //   msg: < item: data >
      // In TT_TextProto, map<key, value> does not occur.
      if (Style.Language == FormatStyle::LK_TextProto ||
          (Style.Language == FormatStyle::LK_Proto && Left->Previous &&
           Left->Previous->isOneOf(TT_SelectorName, TT_DictLiteral)))
        CurrentToken->setType(TT_DictLiteral);
      else
        CurrentToken->setType(TT_TemplateCloser);
      next();
      return true;
    }
    if (CurrentToken->is(tok::question) &&
        Style.Language == FormatStyle::LK_Java) {
      next();
      continue;
    }
    if (CurrentToken->isOneOf(tok::r_paren, tok::r_square, tok::r_brace) ||
        (CurrentToken->isOneOf(tok::colon, tok::question) && InExprContext &&
         !Style.isCSharp() && Style.Language != FormatStyle::LK_Proto &&
         Style.Language != FormatStyle::LK_TextProto))
      return false;
    // If a && or || is found and interpreted as a binary operator, this set
    // of angles is likely part of something like "a < b && c > d". If the
    // angles are inside an expression, the ||/&& might also be a binary
    // operator that was misinterpreted because we are parsing template
    // parameters.
    // FIXME: This is getting out of hand, write a decent parser.
    if (CurrentToken->Previous->isOneOf(tok::pipepipe, tok::ampamp) &&
        CurrentToken->Previous->is(TT_BinaryOperator) &&
        Contexts[Contexts.size() - 2].IsExpression &&
        !Line.startsWith(tok::kw_template))
      return false;
    updateParameterCount(Left, CurrentToken);
    if (Style.Language == FormatStyle::LK_Proto) {
      if (FormatToken *Previous = CurrentToken->getPreviousNonComment()) {
        if (CurrentToken->is(tok::colon) ||
            (CurrentToken->isOneOf(tok::l_brace, tok::less) &&
             Previous->isNot(tok::colon)))
          Previous->setType(TT_SelectorName);
      }
    }
    if (!consumeToken())
      return false;
  }
  return false;
}

bool parseUntouchableParens() {
  while (CurrentToken) {
    CurrentToken->Finalized = true;
    switch (CurrentToken->Tok.getKind()) {
    case tok::l_paren:
      next();
      if (!parseUntouchableParens())
        return false;
      continue;
    case tok::r_paren:
      next();
      return true;
    default:
      // no-op
      break;
    }
    next();
  }
  return false;
}

bool parseParens(bool LookForDecls = false) {
  if (!CurrentToken)
    return false;
  FormatToken *Left = CurrentToken->Previous;
  assert(Left && "Unknown previous token")(static_cast <bool> (Left && "Unknown previous token"
) ? void (0) : __assert_fail ("Left && \"Unknown previous token\""
, "clang/lib/Format/TokenAnnotator.cpp", 208, __extension__ __PRETTY_FUNCTION__
));
  FormatToken *PrevNonComment = Left->getPreviousNonComment();
  Left->ParentBracket = Contexts.back().ContextKind;
  ScopedContextCreator ContextCreator(*this, tok::l_paren, 1);

  // FIXME: This is a bit of a hack. Do better.
  Contexts.back().ColonIsForRangeExpr =
      Contexts.size() == 2 && Contexts[0].ColonIsForRangeExpr;

  if (Left->Previous && Left->Previous->is(TT_UntouchableMacroFunc)) {
    Left->Finalized = true;
    return parseUntouchableParens();
  }

  bool StartsObjCMethodExpr = false;
  if (FormatToken *MaybeSel = Left->Previous) {
    // @selector( starts a selector.
    if (MaybeSel->isObjCAtKeyword(tok::objc_selector) && MaybeSel->Previous &&
        MaybeSel->Previous->is(tok::at)) {
      StartsObjCMethodExpr = true;
    }
  }

  if (Left->is(TT_OverloadedOperatorLParen)) {
    // Find the previous kw_operator token.
    FormatToken *Prev = Left;
    while (!Prev->is(tok::kw_operator)) {
      Prev = Prev->Previous;
      assert(Prev && "Expect a kw_operator prior to the OperatorLParen!")(static_cast <bool> (Prev && "Expect a kw_operator prior to the OperatorLParen!"
) ? void (0) : __assert_fail ("Prev && \"Expect a kw_operator prior to the OperatorLParen!\""
, "clang/lib/Format/TokenAnnotator.cpp", 236, __extension__ __PRETTY_FUNCTION__
));
    }

    // If faced with "a.operator*(argument)" or "a->operator*(argument)",
    // i.e. the operator is called as a member function,
    // then the argument must be an expression.
    bool OperatorCalledAsMemberFunction =
        Prev->Previous && Prev->Previous->isOneOf(tok::period, tok::arrow);
    Contexts.back().IsExpression = OperatorCalledAsMemberFunction;
  } else if (Style.isJavaScript() &&
             (Line.startsWith(Keywords.kw_type, tok::identifier) ||
              Line.startsWith(tok::kw_export, Keywords.kw_type,
                              tok::identifier))) {
    // type X = (...);
    // export type X = (...);
    Contexts.back().IsExpression = false;
  } else if (Left->Previous &&
             (Left->Previous->isOneOf(tok::kw_static_assert, tok::kw_while,
                                      tok::l_paren, tok::comma) ||
              Left->Previous->isIf() ||
              Left->Previous->is(TT_BinaryOperator))) {
    // static_assert, if and while usually contain expressions.
    Contexts.back().IsExpression = true;
  } else if (Style.isJavaScript() && Left->Previous &&
             (Left->Previous->is(Keywords.kw_function) ||
              (Left->Previous->endsSequence(tok::identifier,
                                            Keywords.kw_function)))) {
    // function(...) or function f(...)
    Contexts.back().IsExpression = false;
  } else if (Style.isJavaScript() && Left->Previous &&
             Left->Previous->is(TT_JsTypeColon)) {
    // let x: (SomeType);
    Contexts.back().IsExpression = false;
  } else if (isLambdaParameterList(Left)) {
    // This is a parameter list of a lambda expression.
    Contexts.back().IsExpression = false;
  } else if (Line.InPPDirective &&
             (!Left->Previous || !Left->Previous->is(tok::identifier))) {
    Contexts.back().IsExpression = true;
  } else if (Contexts[Contexts.size() - 2].CaretFound) {
    // This is the parameter list of an ObjC block.
    Contexts.back().IsExpression = false;
  } else if (Left->Previous && Left->Previous->is(TT_ForEachMacro)) {
    // The first argument to a foreach macro is a declaration.
    Contexts.back().IsForEachMacro = true;
    Contexts.back().IsExpression = false;
  } else if (Left->Previous && Left->Previous->MatchingParen &&
             Left->Previous->MatchingParen->is(TT_ObjCBlockLParen)) {
    Contexts.back().IsExpression = false;
  } else if (!Line.MustBeDeclaration && !Line.InPPDirective) {
    bool IsForOrCatch =
        Left->Previous && Left->Previous->isOneOf(tok::kw_for, tok::kw_catch);
    Contexts.back().IsExpression = !IsForOrCatch;
  }

  // Infer the role of the l_paren based on the previous token if we haven't
  // detected one one yet.
  if (PrevNonComment && Left->is(TT_Unknown)) {
    if (PrevNonComment->is(tok::kw___attribute)) {
      Left->setType(TT_AttributeParen);
    } else if (PrevNonComment->isOneOf(TT_TypenameMacro, tok::kw_decltype,
                                       tok::kw_typeof, tok::kw__Atomic,
                                       tok::kw___underlying_type)) {
      Left->setType(TT_TypeDeclarationParen);
      // decltype() and typeof() usually contain expressions.
      if (PrevNonComment->isOneOf(tok::kw_decltype, tok::kw_typeof))
        Contexts.back().IsExpression = true;
    }
  }

  if (StartsObjCMethodExpr) {
    Contexts.back().ColonIsObjCMethodExpr = true;
    Left->setType(TT_ObjCMethodExpr);
  }

  // MightBeFunctionType and ProbablyFunctionType are used for
  // function pointer and reference types as well as Objective-C
  // block types:
  //
  // void (*FunctionPointer)(void);
  // void (&FunctionReference)(void);
  // void (&&FunctionReference)(void);
  // void (^ObjCBlock)(void);
  bool MightBeFunctionType = !Contexts[Contexts.size() - 2].IsExpression;
  bool ProbablyFunctionType =
      CurrentToken->isOneOf(tok::star, tok::amp, tok::ampamp, tok::caret);
  bool HasMultipleLines = false;
  bool HasMultipleParametersOnALine = false;
  bool MightBeObjCForRangeLoop =
      Left->Previous && Left->Previous->is(tok::kw_for);
  FormatToken *PossibleObjCForInToken = nullptr;
  while (CurrentToken) {
    // LookForDecls is set when "if (" has been seen. Check for
    // 'identifier' '*' 'identifier' followed by not '=' -- this
    // '*' has to be a binary operator but determineStarAmpUsage() will
    // categorize it as an unary operator, so set the right type here.
    if (LookForDecls && CurrentToken->Next) {
      FormatToken *Prev = CurrentToken->getPreviousNonComment();
      if (Prev) {
        FormatToken *PrevPrev = Prev->getPreviousNonComment();
        FormatToken *Next = CurrentToken->Next;
        if (PrevPrev && PrevPrev->is(tok::identifier) &&
            Prev->isOneOf(tok::star, tok::amp, tok::ampamp) &&
            CurrentToken->is(tok::identifier) && Next->isNot(tok::equal)) {
          Prev->setType(TT_BinaryOperator);
          LookForDecls = false;
        }
      }
    }

    if (CurrentToken->Previous->is(TT_PointerOrReference) &&
        CurrentToken->Previous->Previous->isOneOf(tok::l_paren,
                                                  tok::coloncolon))
      ProbablyFunctionType = true;
    if (CurrentToken->is(tok::comma))
      MightBeFunctionType = false;
    if (CurrentToken->Previous->is(TT_BinaryOperator))
      Contexts.back().IsExpression = true;
    if (CurrentToken->is(tok::r_paren)) {
      if (MightBeFunctionType && ProbablyFunctionType && CurrentToken->Next &&
          (CurrentToken->Next->is(tok::l_paren) ||
           (CurrentToken->Next->is(tok::l_square) && Line.MustBeDeclaration)))
        Left->setType(Left->Next->is(tok::caret) ? TT_ObjCBlockLParen
                                                 : TT_FunctionTypeLParen);
      Left->MatchingParen = CurrentToken;
      CurrentToken->MatchingParen = Left;

      if (CurrentToken->Next && CurrentToken->Next->is(tok::l_brace) &&
          Left->Previous && Left->Previous->is(tok::l_paren)) {
        // Detect the case where macros are used to generate lambdas or
        // function bodies, e.g.:
        //   auto my_lambda = MACRO((Type *type, int i) { .. body .. });
        for (FormatToken *Tok = Left; Tok != CurrentToken; Tok = Tok->Next) {
          if (Tok->is(TT_BinaryOperator) &&
              Tok->isOneOf(tok::star, tok::amp, tok::ampamp))
            Tok->setType(TT_PointerOrReference);
        }
      }

      if (StartsObjCMethodExpr) {
        CurrentToken->setType(TT_ObjCMethodExpr);
        if (Contexts.back().FirstObjCSelectorName) {
          Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
              Contexts.back().LongestObjCSelectorName;
        }
      }

      if (Left->is(TT_AttributeParen))
        CurrentToken->setType(TT_AttributeParen);
      if (Left->is(TT_TypeDeclarationParen))
        CurrentToken->setType(TT_TypeDeclarationParen);
      if (Left->Previous && Left->Previous->is(TT_JavaAnnotation))
        CurrentToken->setType(TT_JavaAnnotation);
      if (Left->Previous && Left->Previous->is(TT_LeadingJavaAnnotation))
        CurrentToken->setType(TT_LeadingJavaAnnotation);
      if (Left->Previous && Left->Previous->is(TT_AttributeSquare))
        CurrentToken->setType(TT_AttributeSquare);

      if (!HasMultipleLines)
        Left->setPackingKind(PPK_Inconclusive);
      else if (HasMultipleParametersOnALine)
        Left->setPackingKind(PPK_BinPacked);
      else
        Left->setPackingKind(PPK_OnePerLine);

      next();
      return true;
    }
    if (CurrentToken->isOneOf(tok::r_square, tok::r_brace))
      return false;

    if (CurrentToken->is(tok::l_brace))
      Left->setType(TT_Unknown); // Not TT_ObjCBlockLParen
    if (CurrentToken->is(tok::comma) && CurrentToken->Next &&
        !CurrentToken->Next->HasUnescapedNewline &&
        !CurrentToken->Next->isTrailingComment())
      HasMultipleParametersOnALine = true;
    bool ProbablyFunctionTypeLParen =
        (CurrentToken->is(tok::l_paren) && CurrentToken->Next &&
         CurrentToken->Next->isOneOf(tok::star, tok::amp, tok::caret));
    if ((CurrentToken->Previous->isOneOf(tok::kw_const, tok::kw_auto) ||
         CurrentToken->Previous->isSimpleTypeSpecifier()) &&
        !(CurrentToken->is(tok::l_brace) ||
          (CurrentToken->is(tok::l_paren) && !ProbablyFunctionTypeLParen)))
      Contexts.back().IsExpression = false;
    if (CurrentToken->isOneOf(tok::semi, tok::colon)) {
      MightBeObjCForRangeLoop = false;
      if (PossibleObjCForInToken) {
        PossibleObjCForInToken->setType(TT_Unknown);
        PossibleObjCForInToken = nullptr;
      }
    }
    if (MightBeObjCForRangeLoop && CurrentToken->is(Keywords.kw_in)) {
      PossibleObjCForInToken = CurrentToken;
      PossibleObjCForInToken->setType(TT_ObjCForIn);
    }
    // When we discover a 'new', we set CanBeExpression to 'false' in order to
    // parse the type correctly. Reset that after a comma.
    if (CurrentToken->is(tok::comma))
      Contexts.back().CanBeExpression = true;

    FormatToken *Tok = CurrentToken;
    if (!consumeToken())
      return false;
    updateParameterCount(Left, Tok);
    if (CurrentToken && CurrentToken->HasUnescapedNewline)
      HasMultipleLines = true;
  }
  return false;
}

bool isCSharpAttributeSpecifier(const FormatToken &Tok) {
  if (!Style.isCSharp())
    return false;

  // `identifier[i]` is not an attribute.
  if (Tok.Previous && Tok.Previous->is(tok::identifier))
    return false;

  // Chains of [] in `identifier[i][j][k]` are not attributes.
  if (Tok.Previous && Tok.Previous->is(tok::r_square)) {
    auto *MatchingParen = Tok.Previous->MatchingParen;
    if (!MatchingParen || MatchingParen->is(TT_ArraySubscriptLSquare))
      return false;
  }

  const FormatToken *AttrTok = Tok.Next;
  if (!AttrTok)
    return false;

  // Just an empty declaration e.g. string [].
  if (AttrTok->is(tok::r_square))
    return false;

  // Move along the tokens inbetween the '[' and ']' e.g. [STAThread].
  while (AttrTok && AttrTok->isNot(tok::r_square)) {
    AttrTok = AttrTok->Next;
  }

  if (!AttrTok)
    return false;

  // Allow an attribute to be the only content of a file.
  AttrTok = AttrTok->Next;
  if (!AttrTok)
    return true;

  // Limit this to being an access modifier that follows.
  if (AttrTok->isOneOf(tok::kw_public, tok::kw_private, tok::kw_protected,
                       tok::comment, tok::kw_class, tok::kw_static,
                       tok::l_square, Keywords.kw_internal)) {
    return true;
  }

  // incase its a [XXX] retval func(....
  if (AttrTok->Next &&
      AttrTok->Next->startsSequence(tok::identifier, tok::l_paren))
    return true;

  return false;
}

bool isCpp11AttributeSpecifier(const FormatToken &Tok) {
  if (!Style.isCpp() || !Tok.startsSequence(tok::l_square, tok::l_square))
    return false;
  // The first square bracket is part of an ObjC array literal
  if (Tok.Previous && Tok.Previous->is(tok::at)) {
    return false;
  }
  const FormatToken *AttrTok = Tok.Next->Next;
  if (!AttrTok)
    return false;
  // C++17 '[[using ns: foo, bar(baz, blech)]]'
  // We assume nobody will name an ObjC variable 'using'.
  if (AttrTok->startsSequence(tok::kw_using, tok::identifier, tok::colon))
    return true;
  if (AttrTok->isNot(tok::identifier))
    return false;
  while (AttrTok && !AttrTok->startsSequence(tok::r_square, tok::r_square)) {
    // ObjC message send. We assume nobody will use : in a C++11 attribute
    // specifier parameter, although this is technically valid:
    // [[foo(:)]].
    if (AttrTok->is(tok::colon) ||
        AttrTok->startsSequence(tok::identifier, tok::identifier) ||
        AttrTok->startsSequence(tok::r_paren, tok::identifier))
      return false;
    if (AttrTok->is(tok::ellipsis))
      return true;
    AttrTok = AttrTok->Next;
  }
  return AttrTok && AttrTok->startsSequence(tok::r_square, tok::r_square);
}

bool parseSquare() {
  if (!CurrentToken)
    return false;

  // A '[' could be an index subscript (after an identifier or after
  // ')' or ']'), it could be the start of an Objective-C method
  // expression, it could the start of an Objective-C array literal,
  // or it could be a C++ attribute specifier [[foo::bar]].
  FormatToken *Left = CurrentToken->Previous;
  Left->ParentBracket = Contexts.back().ContextKind;
  FormatToken *Parent = Left->getPreviousNonComment();

  // Cases where '>' is followed by '['.
  // In C++, this can happen either in array of templates (foo<int>[10])
  // or when array is a nested template type (unique_ptr<type1<type2>[]>).
  bool CppArrayTemplates =
      Style.isCpp() && Parent && Parent->is(TT_TemplateCloser) &&
      (Contexts.back().CanBeExpression || Contexts.back().IsExpression ||
       Contexts.back().InTemplateArgument);

  bool IsCpp11AttributeSpecifier = isCpp11AttributeSpecifier(*Left) ||
                                   Contexts.back().InCpp11AttributeSpecifier;

  // Treat C# Attributes [STAThread] much like C++ attributes [[...]].
  bool IsCSharpAttributeSpecifier =
      isCSharpAttributeSpecifier(*Left) ||
      Contexts.back().InCSharpAttributeSpecifier;

  bool InsideInlineASM = Line.startsWith(tok::kw_asm);
  bool IsCppStructuredBinding = Left->isCppStructuredBinding(Style);
  bool StartsObjCMethodExpr =
      !IsCppStructuredBinding && !InsideInlineASM && !CppArrayTemplates &&
      Style.isCpp() && !IsCpp11AttributeSpecifier &&
      !IsCSharpAttributeSpecifier && Contexts.back().CanBeExpression &&
      Left->isNot(TT_LambdaLSquare) &&
      !CurrentToken->isOneOf(tok::l_brace, tok::r_square) &&
      (!Parent ||
       Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
                       tok::kw_return, tok::kw_throw) ||
       Parent->isUnaryOperator() ||
       // FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
       Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
       (getBinOpPrecedence(Parent->Tok.getKind(), true, true) >
        prec::Unknown));
  bool ColonFound = false;

  unsigned BindingIncrease = 1;
  if (IsCppStructuredBinding) {
    Left->setType(TT_StructuredBindingLSquare);
  } else if (Left->is(TT_Unknown)) {
    if (StartsObjCMethodExpr) {
      Left->setType(TT_ObjCMethodExpr);
    } else if (InsideInlineASM) {
      Left->setType(TT_InlineASMSymbolicNameLSquare);
    } else if (IsCpp11AttributeSpecifier) {
      Left->setType(TT_AttributeSquare);
    } else if (Style.isJavaScript() && Parent &&
               Contexts.back().ContextKind == tok::l_brace &&
               Parent->isOneOf(tok::l_brace, tok::comma)) {
      Left->setType(TT_JsComputedPropertyName);
    } else if (Style.isCpp() && Contexts.back().ContextKind == tok::l_brace &&
               Parent && Parent->isOneOf(tok::l_brace, tok::comma)) {
      Left->setType(TT_DesignatedInitializerLSquare);
    } else if (IsCSharpAttributeSpecifier) {
      Left->setType(TT_AttributeSquare);
    } else if (CurrentToken->is(tok::r_square) && Parent &&
               Parent->is(TT_TemplateCloser)) {
      Left->setType(TT_ArraySubscriptLSquare);
    } else if (Style.Language == FormatStyle::LK_Proto ||
               Style.Language == FormatStyle::LK_TextProto) {
      // Square braces in LK_Proto can either be message field attributes:
      //
      // optional Aaa aaa = 1 [
      //   (aaa) = aaa
      // ];
      //
      // extensions 123 [
      //   (aaa) = aaa
      // ];
      //
      // or text proto extensions (in options):
      //
      // option (Aaa.options) = {
      //   [type.type/type] {
      //     key: value
      //   }
      // }
      //
      // or repeated fields (in options):
      //
      // option (Aaa.options) = {
      //   keys: [ 1, 2, 3 ]
      // }
      //
      // In the first and the third case we want to spread the contents inside
      // the square braces; in the second we want to keep them inline.
      Left->setType(TT_ArrayInitializerLSquare);
      if (!Left->endsSequence(tok::l_square, tok::numeric_constant,
                              tok::equal) &&
          !Left->endsSequence(tok::l_square, tok::numeric_constant,
                              tok::identifier) &&
          !Left->endsSequence(tok::l_square, tok::colon, TT_SelectorName)) {
        Left->setType(TT_ProtoExtensionLSquare);
        BindingIncrease = 10;
      }
    } else if (!CppArrayTemplates && Parent &&
               Parent->isOneOf(TT_BinaryOperator, TT_TemplateCloser, tok::at,
                               tok::comma, tok::l_paren, tok::l_square,
                               tok::question, tok::colon, tok::kw_return,
                               // Should only be relevant to JavaScript:
                               tok::kw_default)) {
      Left->setType(TT_ArrayInitializerLSquare);
    } else {
      BindingIncrease = 10;
      Left->setType(TT_ArraySubscriptLSquare);
    }
  }

  ScopedContextCreator ContextCreator(*this, tok::l_square, BindingIncrease);
  Contexts.back().IsExpression = true;
  if (Style.isJavaScript() && Parent && Parent->is(TT_JsTypeColon))
    Contexts.back().IsExpression = false;

  Contexts.back().ColonIsObjCMethodExpr = StartsObjCMethodExpr;
  Contexts.back().InCpp11AttributeSpecifier = IsCpp11AttributeSpecifier;
  Contexts.back().InCSharpAttributeSpecifier = IsCSharpAttributeSpecifier;

  while (CurrentToken) {
    if (CurrentToken->is(tok::r_square)) {
      if (IsCpp11AttributeSpecifier)
        CurrentToken->setType(TT_AttributeSquare);
      if (IsCSharpAttributeSpecifier)
        CurrentToken->setType(TT_AttributeSquare);
      else if (((CurrentToken->Next &&
                 CurrentToken->Next->is(tok::l_paren)) ||
                (CurrentToken->Previous &&
                 CurrentToken->Previous->Previous == Left)) &&
               Left->is(TT_ObjCMethodExpr)) {
        // An ObjC method call is rarely followed by an open parenthesis. It
        // also can't be composed of just one token, unless it's a macro that
        // will be expanded to more tokens.
        // FIXME: Do we incorrectly label ":" with this?
        StartsObjCMethodExpr = false;
        Left->setType(TT_Unknown);
      }
      if (StartsObjCMethodExpr && CurrentToken->Previous != Left) {
        CurrentToken->setType(TT_ObjCMethodExpr);
        // If we haven't seen a colon yet, make sure the last identifier
        // before the r_square is tagged as a selector name component.
        if (!ColonFound && CurrentToken->Previous &&
            CurrentToken->Previous->is(TT_Unknown) &&
            canBeObjCSelectorComponent(*CurrentToken->Previous))
          CurrentToken->Previous->setType(TT_SelectorName);
        // determineStarAmpUsage() thinks that '*' '[' is allocating an
        // array of pointers, but if '[' starts a selector then '*' is a
        // binary operator.
        if (Parent && Parent->is(TT_PointerOrReference))
          Parent->setType(TT_BinaryOperator);
      }
      // An arrow after an ObjC method expression is not a lambda arrow.
      if (CurrentToken->getType() == TT_ObjCMethodExpr &&
          CurrentToken->Next && CurrentToken->Next->is(TT_LambdaArrow))
        CurrentToken->Next->setType(TT_Unknown);
      Left->MatchingParen = CurrentToken;
      CurrentToken->MatchingParen = Left;
      // FirstObjCSelectorName is set when a colon is found. This does
      // not work, however, when the method has no parameters.
      // Here, we set FirstObjCSelectorName when the end of the method call is
      // reached, in case it was not set already.
      if (!Contexts.back().FirstObjCSelectorName) {
        FormatToken *Previous = CurrentToken->getPreviousNonComment();
        if (Previous && Previous->is(TT_SelectorName)) {
          Previous->ObjCSelectorNameParts = 1;
          Contexts.back().FirstObjCSelectorName = Previous;
        }
      } else {
        Left->ParameterCount =
            Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts;
      }
      if (Contexts.back().FirstObjCSelectorName) {
        Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
            Contexts.back().LongestObjCSelectorName;
        if (Left->BlockParameterCount > 1)
          Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName = 0;
      }
      next();
      return true;
    }
    if (CurrentToken->isOneOf(tok::r_paren, tok::r_brace))
      return false;
    if (CurrentToken->is(tok::colon)) {
      if (IsCpp11AttributeSpecifier &&
          CurrentToken->endsSequence(tok::colon, tok::identifier,
                                     tok::kw_using)) {
        // Remember that this is a [[using ns: foo]] C++ attribute, so we
        // don't add a space before the colon (unlike other colons).
        CurrentToken->setType(TT_AttributeColon);
      } else if (Left->isOneOf(TT_ArraySubscriptLSquare,
                               TT_DesignatedInitializerLSquare)) {
        Left->setType(TT_ObjCMethodExpr);
        StartsObjCMethodExpr = true;
        Contexts.back().ColonIsObjCMethodExpr = true;
        if (Parent && Parent->is(tok::r_paren))
          // FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
          Parent->setType(TT_CastRParen);
      }
      ColonFound = true;
    }
    if (CurrentToken->is(tok::comma) && Left->is(TT_ObjCMethodExpr) &&
        !ColonFound)
      Left->setType(TT_ArrayInitializerLSquare);
    FormatToken *Tok = CurrentToken;
    if (!consumeToken())
      return false;
    updateParameterCount(Left, Tok);
  }
  return false;
}

bool couldBeInStructArrayInitializer() const {
  if (Contexts.size() < 2)
    return false;
  // We want to back up no more then 2 context levels i.e.
  // . { { <-
  const auto End = std::next(Contexts.rbegin(), 2);
  auto Last = Contexts.rbegin();
  unsigned Depth = 0;
  for (; Last != End; ++Last) {
    if (Last->ContextKind == tok::l_brace)
      ++Depth;
  }
  return Depth == 2 && Last->ContextKind != tok::l_brace;
}

bool parseBrace() {
  if (CurrentToken) {
    FormatToken *Left = CurrentToken->Previous;
    Left->ParentBracket = Contexts.back().ContextKind;

    if (Contexts.back().CaretFound)
      Left->setType(TT_ObjCBlockLBrace);
    Contexts.back().CaretFound = false;

    ScopedContextCreator ContextCreator(*this, tok::l_brace, 1);
    Contexts.back().ColonIsDictLiteral = true;
    if (Left->is(BK_BracedInit))
      Contexts.back().IsExpression = true;
    if (Style.isJavaScript() && Left->Previous &&
        Left->Previous->is(TT_JsTypeColon))
      Contexts.back().IsExpression = false;

    unsigned CommaCount = 0;
    while (CurrentToken) {
      if (CurrentToken->is(tok::r_brace)) {
        assert(Left->Optional == CurrentToken->Optional)(static_cast <bool> (Left->Optional == CurrentToken->
Optional) ? void (0) : __assert_fail ("Left->Optional == CurrentToken->Optional"
, "clang/lib/Format/TokenAnnotator.cpp", 783, __extension__ __PRETTY_FUNCTION__
));
        Left->MatchingParen = CurrentToken;
        CurrentToken->MatchingParen = Left;
        if (Style.AlignArrayOfStructures != FormatStyle::AIAS_None) {
          if (Left->ParentBracket == tok::l_brace &&
              couldBeInStructArrayInitializer() && CommaCount > 0) {
            Contexts.back().InStructArrayInitializer = true;
          }
        }
        next();
        return true;
      }
      if (CurrentToken->isOneOf(tok::r_paren, tok::r_square))
        return false;
      updateParameterCount(Left, CurrentToken);
      if (CurrentToken->isOneOf(tok::colon, tok::l_brace, tok::less)) {
        FormatToken *Previous = CurrentToken->getPreviousNonComment();
        if (Previous->is(TT_JsTypeOptionalQuestion))
          Previous = Previous->getPreviousNonComment();
        if ((CurrentToken->is(tok::colon) &&
             (!Contexts.back().ColonIsDictLiteral || !Style.isCpp())) ||
            Style.Language == FormatStyle::LK_Proto ||
            Style.Language == FormatStyle::LK_TextProto) {
          Left->setType(TT_DictLiteral);
          if (Previous->Tok.getIdentifierInfo() ||
              Previous->is(tok::string_literal))
            Previous->setType(TT_SelectorName);
        }
        if (CurrentToken->is(tok::colon) || Style.isJavaScript())
          Left->setType(TT_DictLiteral);
      }
      if (CurrentToken->is(tok::comma)) {
        if (Style.isJavaScript())
          Left->setType(TT_DictLiteral);
        ++CommaCount;
      }
      if (!consumeToken())
        return false;
    }
  }
  return true;
}

void updateParameterCount(FormatToken *Left, FormatToken *Current) {
  // For ObjC methods, the number of parameters is calculated differently as
  // method declarations have a different structure (the parameters are not
  // inside a bracket scope).
  if (Current->is(tok::l_brace) && Current->is(BK_Block))
    ++Left->BlockParameterCount;
  if (Current->is(tok::comma)) {
    ++Left->ParameterCount;
    if (!Left->Role)
      Left->Role.reset(new CommaSeparatedList(Style));
    Left->Role->CommaFound(Current);
  } else if (Left->ParameterCount == 0 && Current->isNot(tok::comment)) {
    Left->ParameterCount = 1;
  }
}

bool parseConditional() {
  while (CurrentToken) {
    if (CurrentToken->is(tok::colon)) {
      CurrentToken->setType(TT_ConditionalExpr);
      next();
      return true;
    }
    if (!consumeToken())
      return false;
  }
  return false;
}

bool parseTemplateDeclaration() {
  if (CurrentToken && CurrentToken->is(tok::less)) {
    CurrentToken->setType(TT_TemplateOpener);
    next();
    if (!parseAngle())
      return false;
    if (CurrentToken)
      CurrentToken->Previous->ClosesTemplateDeclaration = true;
    return true;
  }
  return false;
}

bool consumeToken() {
  FormatToken *Tok = CurrentToken;
  next();
  switch (Tok->Tok.getKind()) {
  case tok::plus:
  case tok::minus:
    if (!Tok->Previous && Line.MustBeDeclaration)
      Tok->setType(TT_ObjCMethodSpecifier);
    break;
  case tok::colon:
    if (!Tok->Previous)
      return false;
    // Colons from ?: are handled in parseConditional().
    if (Style.isJavaScript()) {
      if (Contexts.back().ColonIsForRangeExpr || // colon in for loop
          (Contexts.size() == 1 &&               // switch/case labels
           !Line.First->isOneOf(tok::kw_enum, tok::kw_case)) ||
          Contexts.back().ContextKind == tok::l_paren ||  // function params
          Contexts.back().ContextKind == tok::l_square || // array type
          (!Contexts.back().IsExpression &&
           Contexts.back().ContextKind == tok::l_brace) || // object type
          (Contexts.size() == 1 &&
           Line.MustBeDeclaration)) { // method/property declaration
        Contexts.back().IsExpression = false;
        Tok->setType(TT_JsTypeColon);
        break;
      }
    } else if (Style.isCSharp()) {
      if (Contexts.back().InCSharpAttributeSpecifier) {
        Tok->setType(TT_AttributeColon);
        break;
      }
      if (Contexts.back().ContextKind == tok::l_paren) {
        Tok->setType(TT_CSharpNamedArgumentColon);
        break;
      }
    }
    if (Line.First->isOneOf(Keywords.kw_module, Keywords.kw_import) ||
        Line.First->startsSequence(tok::kw_export, Keywords.kw_module) ||
        Line.First->startsSequence(tok::kw_export, Keywords.kw_import)) {
      Tok->setType(TT_ModulePartitionColon);
    } else if (Contexts.back().ColonIsDictLiteral ||
               Style.Language == FormatStyle::LK_Proto ||
               Style.Language == FormatStyle::LK_TextProto) {
      Tok->setType(TT_DictLiteral);
      if (Style.Language == FormatStyle::LK_TextProto) {
        if (FormatToken *Previous = Tok->getPreviousNonComment())
          Previous->setType(TT_SelectorName);
      }
    } else if (Contexts.back().ColonIsObjCMethodExpr ||
               Line.startsWith(TT_ObjCMethodSpecifier)) {
      Tok->setType(TT_ObjCMethodExpr);
      const FormatToken *BeforePrevious = Tok->Previous->Previous;
      // Ensure we tag all identifiers in method declarations as
      // TT_SelectorName.
      bool UnknownIdentifierInMethodDeclaration =
          Line.startsWith(TT_ObjCMethodSpecifier) &&
          Tok->Previous->is(tok::identifier) && Tok->Previous->is(TT_Unknown);
      if (!BeforePrevious ||
          // FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
          !(BeforePrevious->is(TT_CastRParen) ||
            (BeforePrevious->is(TT_ObjCMethodExpr) &&
             BeforePrevious->is(tok::colon))) ||
          BeforePrevious->is(tok::r_square) ||
          Contexts.back().LongestObjCSelectorName == 0 ||
          UnknownIdentifierInMethodDeclaration) {
        Tok->Previous->setType(TT_SelectorName);
        if (!Contexts.back().FirstObjCSelectorName)
          Contexts.back().FirstObjCSelectorName = Tok->Previous;
        else if (Tok->Previous->ColumnWidth >
                 Contexts.back().LongestObjCSelectorName)
          Contexts.back().LongestObjCSelectorName =
              Tok->Previous->ColumnWidth;
        Tok->Previous->ParameterIndex =
            Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts;
        ++Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts;
      }
    } else if (Contexts.back().ColonIsForRangeExpr) {
      Tok->setType(TT_RangeBasedForLoopColon);
    } else if (CurrentToken && CurrentToken->is(tok::numeric_constant)) {
      Tok->setType(TT_BitFieldColon);
    } else if (Contexts.size() == 1 &&
               !Line.First->isOneOf(tok::kw_enum, tok::kw_case,
                                    tok::kw_default)) {
      FormatToken *Prev = Tok->getPreviousNonComment();
      if (!Prev)
        break;
      if (Prev->isOneOf(tok::r_paren, tok::kw_noexcept))
        Tok->setType(TT_CtorInitializerColon);
      else if (Prev->is(tok::kw_try)) {
        // Member initializer list within function try block.
        FormatToken *PrevPrev = Prev->getPreviousNonComment();
        if (!PrevPrev)
          break;
        if (PrevPrev && PrevPrev->isOneOf(tok::r_paren, tok::kw_noexcept))
          Tok->setType(TT_CtorInitializerColon);
      } else
        Tok->setType(TT_InheritanceColon);
    } else if (canBeObjCSelectorComponent(*Tok->Previous) && Tok->Next &&
               (Tok->Next->isOneOf(tok::r_paren, tok::comma) ||
                (canBeObjCSelectorComponent(*Tok->Next) && Tok->Next->Next &&
                 Tok->Next->Next->is(tok::colon)))) {
      // This handles a special macro in ObjC code where selectors including
      // the colon are passed as macro arguments.
      Tok->setType(TT_ObjCMethodExpr);
    } else if (Contexts.back().ContextKind == tok::l_paren) {
      Tok->setType(TT_InlineASMColon);
    }
    break;
  case tok::pipe:
  case tok::amp:
    // | and & in declarations/type expressions represent union and
    // intersection types, respectively.
    if (Style.isJavaScript() && !Contexts.back().IsExpression)
      Tok->setType(TT_JsTypeOperator);
    break;
  case tok::kw_if:
  case tok::kw_while:
    if (Tok->is(tok::kw_if) && CurrentToken &&
        CurrentToken->isOneOf(tok::kw_constexpr, tok::identifier))
      next();
    if (CurrentToken && CurrentToken->is(tok::l_paren)) {
      next();
      if (!parseParens(/*LookForDecls=*/true))
        return false;
    }
    break;
  case tok::kw_for:
    if (Style.isJavaScript()) {
      // x.for and {for: ...}
      if ((Tok->Previous && Tok->Previous->is(tok::period)) ||
          (Tok->Next && Tok->Next->is(tok::colon)))
        break;
      // JS' for await ( ...
      if (CurrentToken && CurrentToken->is(Keywords.kw_await))
        next();
    }
    if (Style.isCpp() && CurrentToken && CurrentToken->is(tok::kw_co_await))
      next();
    Contexts.back().ColonIsForRangeExpr = true;
    next();
    if (!parseParens())
      return false;
    break;
  case tok::l_paren:
    // When faced with 'operator()()', the kw_operator handler incorrectly
    // marks the first l_paren as a OverloadedOperatorLParen. Here, we make
    // the first two parens OverloadedOperators and the second l_paren an
    // OverloadedOperatorLParen.
    if (Tok->Previous && Tok->Previous->is(tok::r_paren) &&
        Tok->Previous->MatchingParen &&
        Tok->Previous->MatchingParen->is(TT_OverloadedOperatorLParen)) {
      Tok->Previous->setType(TT_OverloadedOperator);
      Tok->Previous->MatchingParen->setType(TT_OverloadedOperator);
      Tok->setType(TT_OverloadedOperatorLParen);
    }

    if (!parseParens())
      return false;
    if (Line.MustBeDeclaration && Contexts.size() == 1 &&
        !Contexts.back().IsExpression && !Line.startsWith(TT_ObjCProperty) &&
        !Tok->is(TT_TypeDeclarationParen) &&
        (!Tok->Previous || !Tok->Previous->isOneOf(tok::kw___attribute,
                                                   TT_LeadingJavaAnnotation)))
      Line.MightBeFunctionDecl = true;
    break;
  case tok::l_square:
    if (!parseSquare())
      return false;
    break;
  case tok::l_brace:
    if (Style.Language == FormatStyle::LK_TextProto) {
      FormatToken *Previous = Tok->getPreviousNonComment();
      if (Previous && Previous->getType() != TT_DictLiteral)
        Previous->setType(TT_SelectorName);
    }
    if (!parseBrace())
      return false;
    break;
  case tok::less:
    if (parseAngle()) {
      Tok->setType(TT_TemplateOpener);
      // In TT_Proto, we must distignuish between:
      //   map<key, value>
      //   msg < item: data >
      //   msg: < item: data >
      // In TT_TextProto, map<key, value> does not occur.
      if (Style.Language == FormatStyle::LK_TextProto ||
          (Style.Language == FormatStyle::LK_Proto && Tok->Previous &&
           Tok->Previous->isOneOf(TT_SelectorName, TT_DictLiteral))) {
        Tok->setType(TT_DictLiteral);
        FormatToken *Previous = Tok->getPreviousNonComment();
        if (Previous && Previous->getType() != TT_DictLiteral)
          Previous->setType(TT_SelectorName);
      }
    } else {
      Tok->setType(TT_BinaryOperator);
      NonTemplateLess.insert(Tok);
      CurrentToken = Tok;
      next();
    }
    break;
  case tok::r_paren:
  case tok::r_square:
    return false;
  case tok::r_brace:
    // Lines can start with '}'.
    if (Tok->Previous)
      return false;
    break;
  case tok::greater:
    if (Style.Language != FormatStyle::LK_TextProto)
      Tok->setType(TT_BinaryOperator);
    if (Tok->Previous && Tok->Previous->is(TT_TemplateCloser))
      Tok->SpacesRequiredBefore = 1;
    break;
  case tok::kw_operator:
    if (Style.Language == FormatStyle::LK_TextProto ||
        Style.Language == FormatStyle::LK_Proto)
      break;
    while (CurrentToken &&
           !CurrentToken->isOneOf(tok::l_paren, tok::semi, tok::r_paren)) {
      if (CurrentToken->isOneOf(tok::star, tok::amp))
        CurrentToken->setType(TT_PointerOrReference);
      consumeToken();
      if (CurrentToken && CurrentToken->is(tok::comma) &&
          CurrentToken->Previous->isNot(tok::kw_operator))
        break;
      if (CurrentToken && CurrentToken->Previous->isOneOf(
                              TT_BinaryOperator, TT_UnaryOperator, tok::comma,
                              tok::star, tok::arrow, tok::amp, tok::ampamp))
        CurrentToken->Previous->setType(TT_OverloadedOperator);
    }
    if (CurrentToken && CurrentToken->is(tok::l_paren))
      CurrentToken->setType(TT_OverloadedOperatorLParen);
    if (CurrentToken && CurrentToken->Previous->is(TT_BinaryOperator))
      CurrentToken->Previous->setType(TT_OverloadedOperator);
    break;
  case tok::question:
    if (Style.isJavaScript() && Tok->Next &&
        Tok->Next->isOneOf(tok::semi, tok::comma, tok::colon, tok::r_paren,
                           tok::r_brace)) {
      // Question marks before semicolons, colons, etc. indicate optional
      // types (fields, parameters), e.g.
      //   function(x?: string, y?) {...}
      //   class X { y?; }
      Tok->setType(TT_JsTypeOptionalQuestion);
      break;
    }
    // Declarations cannot be conditional expressions, this can only be part
    // of a type declaration.
    if (Line.MustBeDeclaration && !Contexts.back().IsExpression &&
        Style.isJavaScript())
      break;
    if (Style.isCSharp()) {
      // `Type?)`, `Type?>`, `Type? name;` and `Type? name =` can only be
      // nullable types.
      // Line.MustBeDeclaration will be true for `Type? name;`.
      if ((!Contexts.back().IsExpression && Line.MustBeDeclaration) ||
          (Tok->Next && Tok->Next->isOneOf(tok::r_paren, tok::greater)) ||
          (Tok->Next && Tok->Next->is(tok::identifier) && Tok->Next->Next &&
           Tok->Next->Next->is(tok::equal))) {
        Tok->setType(TT_CSharpNullable);
        break;
      }
    }
    parseConditional();
    break;
  case tok::kw_template:
    parseTemplateDeclaration();
    break;
  case tok::comma:
    if (Contexts.back().InCtorInitializer)
      Tok->setType(TT_CtorInitializerComma);
    else if (Contexts.back().InInheritanceList)
      Tok->setType(TT_InheritanceComma);
    else if (Contexts.back().FirstStartOfName &&
             (Contexts.size() == 1 || Line.startsWith(tok::kw_for))) {
      Contexts.back().FirstStartOfName->PartOfMultiVariableDeclStmt = true;
      Line.IsMultiVariableDeclStmt = true;
    }
    if (Contexts.back().IsForEachMacro)
      Contexts.back().IsExpression = true;
    break;
  case tok::identifier:
    if (Tok->isOneOf(Keywords.kw___has_include,
                     Keywords.kw___has_include_next)) {
      parseHasInclude();
    }
    if (Style.isCSharp() && Tok->is(Keywords.kw_where) && Tok->Next &&
        Tok->Next->isNot(tok::l_paren)) {
      Tok->setType(TT_CSharpGenericTypeConstraint);
      parseCSharpGenericTypeConstraint();
    }
    break;
  default:
    break;
  }
  return true;
}

void parseCSharpGenericTypeConstraint() {
  int OpenAngleBracketsCount = 0;
  while (CurrentToken) {
    if (CurrentToken->is(tok::less)) {
      // parseAngle is too greedy and will consume the whole line.
      CurrentToken->setType(TT_TemplateOpener);
      ++OpenAngleBracketsCount;
      next();
    } else if (CurrentToken->is(tok::greater)) {
      CurrentToken->setType(TT_TemplateCloser);
      --OpenAngleBracketsCount;
      next();
    } else if (CurrentToken->is(tok::comma) && OpenAngleBracketsCount == 0) {
      // We allow line breaks after GenericTypeConstraintComma's
      // so do not flag commas in Generics as GenericTypeConstraintComma's.
      CurrentToken->setType(TT_CSharpGenericTypeConstraintComma);
      next();
    } else if (CurrentToken->is(Keywords.kw_where)) {
      CurrentToken->setType(TT_CSharpGenericTypeConstraint);
      next();
    } else if (CurrentToken->is(tok::colon)) {
      CurrentToken->setType(TT_CSharpGenericTypeConstraintColon);
      next();
    } else {
      next();
    }
  }
}

void parseIncludeDirective() {
  if (CurrentToken && CurrentToken->is(tok::less)) {
    next();
    while (CurrentToken) {
      // Mark tokens up to the trailing line comments as implicit string
      // literals.
      if (CurrentToken->isNot(tok::comment) &&
          !CurrentToken->TokenText.startswith("//"))
        CurrentToken->setType(TT_ImplicitStringLiteral);
      next();
    }
  }
}

void parseWarningOrError() {
  next();
  // We still want to format the whitespace left of the first token of the
  // warning or error.
  next();
  while (CurrentToken) {
    CurrentToken->setType(TT_ImplicitStringLiteral);
    next();
  }
}

void parsePragma() {
  next(); // Consume "pragma".
  if (CurrentToken &&
      CurrentToken->isOneOf(Keywords.kw_mark, Keywords.kw_option)) {
    bool IsMark = CurrentToken->is(Keywords.kw_mark);
    next(); // Consume "mark".
    next(); // Consume first token (so we fix leading whitespace).
    while (CurrentToken) {
      if (IsMark || CurrentToken->Previous->is(TT_BinaryOperator))
        CurrentToken->setType(TT_ImplicitStringLiteral);
      next();
    }
  }
}

void parseHasInclude() {
  if (!CurrentToken || !CurrentToken->is(tok::l_paren))
    return;
  next(); // '('
  parseIncludeDirective();
  next(); // ')'
}

LineType parsePreprocessorDirective() {
  bool IsFirstToken = CurrentToken->IsFirst;
  LineType Type = LT_PreprocessorDirective;
  next();
  if (!CurrentToken)
    return Type;

  if (Style.isJavaScript() && IsFirstToken) {
    // JavaScript files can contain shebang lines of the form:
    // #!/usr/bin/env node
    // Treat these like C++ #include directives.
    while (CurrentToken) {
      // Tokens cannot be comments here.
      CurrentToken->setType(TT_ImplicitStringLiteral);
      next();
    }
    return LT_ImportStatement;
  }

  if (CurrentToken->Tok.is(tok::numeric_constant)) {
    CurrentToken->SpacesRequiredBefore = 1;
    return Type;
  }
  // Hashes in the middle of a line can lead to any strange token
  // sequence.
  if (!CurrentToken->Tok.getIdentifierInfo())
    return Type;
  switch (CurrentToken->Tok.getIdentifierInfo()->getPPKeywordID()) {
  case tok::pp_include:
  case tok::pp_include_next:
  case tok::pp_import:
    next();
    parseIncludeDirective();
    Type = LT_ImportStatement;
    break;
  case tok::pp_error:
  case tok::pp_warning:
    parseWarningOrError();
    break;
  case tok::pp_pragma:
    parsePragma();
    break;
  case tok::pp_if:
  case tok::pp_elif:
    Contexts.back().IsExpression = true;
    next();
    parseLine();
    break;
  default:
    break;
  }
  while (CurrentToken) {
    FormatToken *Tok = CurrentToken;
    next();
    if (Tok->is(tok::l_paren))
      parseParens();
    else if (Tok->isOneOf(Keywords.kw___has_include,
                          Keywords.kw___has_include_next))
      parseHasInclude();
  }
  return Type;
}

1309public:
LineType parseLine() {
  if (!CurrentToken)
    return LT_Invalid;
  NonTemplateLess.clear();
  if (CurrentToken->is(tok::hash))
    return parsePreprocessorDirective();

  // Directly allow to 'import <string-literal>' to support protocol buffer
  // definitions (github.com/google/protobuf) or missing "#" (either way we
  // should not break the line).
  IdentifierInfo *Info = CurrentToken->Tok.getIdentifierInfo();
  if ((Style.Language == FormatStyle::LK_Java &&
       CurrentToken->is(Keywords.kw_package)) ||
      (Info && Info->getPPKeywordID() == tok::pp_import &&
       CurrentToken->Next &&
       CurrentToken->Next->isOneOf(tok::string_literal, tok::identifier,
                                   tok::kw_static))) {
    next();
    parseIncludeDirective();
    return LT_ImportStatement;
  }

  // If this line starts and ends in '<' and '>', respectively, it is likely
  // part of "#define <a/b.h>".
  if (CurrentToken->is(tok::less) && Line.Last->is(tok::greater)) {
    parseIncludeDirective();
    return LT_ImportStatement;
  }

  // In .proto files, top-level options and package statements are very
  // similar to import statements and should not be line-wrapped.
  if (Style.Language == FormatStyle::LK_Proto && Line.Level == 0 &&
      CurrentToken->isOneOf(Keywords.kw_option, Keywords.kw_package)) {
    next();
    if (CurrentToken && CurrentToken->is(tok::identifier)) {
      while (CurrentToken)
        next();
      return LT_ImportStatement;
    }
  }

  bool KeywordVirtualFound = false;
  bool ImportStatement = false;

  // import {...} from '...';
  if (Style.isJavaScript() && CurrentToken->is(Keywords.kw_import))
    ImportStatement = true;

  while (CurrentToken) {
    if (CurrentToken->is(tok::kw_virtual))
      KeywordVirtualFound = true;
    if (Style.isJavaScript()) {
      // export {...} from '...';
      // An export followed by "from 'some string';" is a re-export from
      // another module identified by a URI and is treated as a
      // LT_ImportStatement (i.e. prevent wraps on it for long URIs).
      // Just "export {...};" or "export class ..." should not be treated as
      // an import in this sense.
      if (Line.First->is(tok::kw_export) &&
          CurrentToken->is(Keywords.kw_from) && CurrentToken->Next &&
          CurrentToken->Next->isStringLiteral())
        ImportStatement = true;
      if (isClosureImportStatement(*CurrentToken))
        ImportStatement = true;
    }
    if (!consumeToken())
      return LT_Invalid;
  }
  if (KeywordVirtualFound)
    return LT_VirtualFunctionDecl;
  if (ImportStatement)
    return LT_ImportStatement;

  if (Line.startsWith(TT_ObjCMethodSpecifier)) {
    if (Contexts.back().FirstObjCSelectorName)
      Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
          Contexts.back().LongestObjCSelectorName;
    return LT_ObjCMethodDecl;
  }

  for (const auto &ctx : Contexts) {
    if (ctx.InStructArrayInitializer) {
      return LT_ArrayOfStructInitializer;
    }
  }

  return LT_Other;
}

1399private:
bool isClosureImportStatement(const FormatToken &Tok) {
  // FIXME: Closure-library specific stuff should not be hard-coded but be
  // configurable.
  return Tok.TokenText == "goog" && Tok.Next && Tok.Next->is(tok::period) &&
         Tok.Next->Next &&
         (Tok.Next->Next->TokenText == "module" ||
          Tok.Next->Next->TokenText == "provide" ||
          Tok.Next->Next->TokenText == "require" ||
          Tok.Next->Next->TokenText == "requireType" ||
          Tok.Next->Next->TokenText == "forwardDeclare") &&
         Tok.Next->Next->Next && Tok.Next->Next->Next->is(tok::l_paren);
}

void resetTokenMetadata() {
  if (!CurrentToken)
    return;

  // Reset token type in case we have already looked at it and then
  // recovered from an error (e.g. failure to find the matching >).
  if (!CurrentToken->isOneOf(
          TT_LambdaLSquare, TT_LambdaLBrace, TT_AttributeMacro, TT_IfMacro,
          TT_ForEachMacro, TT_TypenameMacro, TT_FunctionLBrace,
          TT_ImplicitStringLiteral, TT_InlineASMBrace, TT_FatArrow,
          TT_LambdaArrow, TT_NamespaceMacro, TT_OverloadedOperator,
          TT_RegexLiteral, TT_TemplateString, TT_ObjCStringLiteral,
          TT_UntouchableMacroFunc, TT_ConstraintJunctions,
          TT_StatementAttributeLikeMacro))
    CurrentToken->setType(TT_Unknown);
  CurrentToken->Role.reset();
  CurrentToken->MatchingParen = nullptr;
  CurrentToken->FakeLParens.clear();
  CurrentToken->FakeRParens = 0;
}

void next() {
  if (!CurrentToken)
    return;

  CurrentToken->NestingLevel = Contexts.size() - 1;
  CurrentToken->BindingStrength = Contexts.back().BindingStrength;
  modifyContext(*CurrentToken);
  determineTokenType(*CurrentToken);
  CurrentToken = CurrentToken->Next;

  resetTokenMetadata();
}

/// A struct to hold information valid in a specific context, e.g.
/// a pair of parenthesis.
struct Context {
  Context(tok::TokenKind ContextKind, unsigned BindingStrength,
          bool IsExpression)
      : ContextKind(ContextKind), BindingStrength(BindingStrength),
        IsExpression(IsExpression) {}

  tok::TokenKind ContextKind;
  unsigned BindingStrength;
  bool IsExpression;
  unsigned LongestObjCSelectorName = 0;
  bool ColonIsForRangeExpr = false;
  bool ColonIsDictLiteral = false;
  bool ColonIsObjCMethodExpr = false;
  FormatToken *FirstObjCSelectorName = nullptr;
  FormatToken *FirstStartOfName = nullptr;
  bool CanBeExpression = true;
  bool InTemplateArgument = false;
  bool InCtorInitializer = false;
  bool InInheritanceList = false;
  bool CaretFound = false;
  bool IsForEachMacro = false;
  bool InCpp11AttributeSpecifier = false;
  bool InCSharpAttributeSpecifier = false;
  bool InStructArrayInitializer = false;
};

/// Puts a new \c Context onto the stack \c Contexts for the lifetime
/// of each instance.
struct ScopedContextCreator {
  AnnotatingParser &P;

  ScopedContextCreator(AnnotatingParser &P, tok::TokenKind ContextKind,
                       unsigned Increase)
      : P(P) {
    P.Contexts.push_back(Context(ContextKind,
                                 P.Contexts.back().BindingStrength + Increase,
                                 P.Contexts.back().IsExpression));
  }

  ~ScopedContextCreator() {
    if (P.Style.AlignArrayOfStructures != FormatStyle::AIAS_None) {
      if (P.Contexts.back().InStructArrayInitializer) {
        P.Contexts.pop_back();
        P.Contexts.back().InStructArrayInitializer = true;
        return;
      }
    }
    P.Contexts.pop_back();
  }
};

void modifyContext(const FormatToken &Current) {
  if (Current.getPrecedence() == prec::Assignment &&
      !Line.First->isOneOf(tok::kw_template, tok::kw_using, tok::kw_return) &&
      // Type aliases use `type X = ...;` in TypeScript and can be exported
      // using `export type ...`.
      !(Style.isJavaScript() &&
        (Line.startsWith(Keywords.kw_type, tok::identifier) ||
         Line.startsWith(tok::kw_export, Keywords.kw_type,
                         tok::identifier))) &&
      (!Current.Previous || Current.Previous->isNot(tok::kw_operator))) {
    Contexts.back().IsExpression = true;
    if (!Line.startsWith(TT_UnaryOperator)) {
      for (FormatToken *Previous = Current.Previous;
           Previous && Previous->Previous &&
           !Previous->Previous->isOneOf(tok::comma, tok::semi);
           Previous = Previous->Previous) {
        if (Previous->isOneOf(tok::r_square, tok::r_paren)) {
          Previous = Previous->MatchingParen;
          if (!Previous)
            break;
        }
        if (Previous->opensScope())
          break;
        if (Previous->isOneOf(TT_BinaryOperator, TT_UnaryOperator) &&
            Previous->isOneOf(tok::star, tok::amp, tok::ampamp) &&
            Previous->Previous && Previous->Previous->isNot(tok::equal))
          Previous->setType(TT_PointerOrReference);
      }
    }
  } else if (Current.is(tok::lessless) &&
             (!Current.Previous || !Current.Previous->is(tok::kw_operator))) {
    Contexts.back().IsExpression = true;
  } else if (Current.isOneOf(tok::kw_return, tok::kw_throw)) {
    Contexts.back().IsExpression = true;
  } else if (Current.is(TT_TrailingReturnArrow)) {
    Contexts.back().IsExpression = false;
  } else if (Current.is(TT_LambdaArrow) || Current.is(Keywords.kw_assert)) {
    Contexts.back().IsExpression = Style.Language == FormatStyle::LK_Java;
  } else if (Current.Previous &&
             Current.Previous->is(TT_CtorInitializerColon)) {
    Contexts.back().IsExpression = true;
    Contexts.back().InCtorInitializer = true;
  } else if (Current.Previous && Current.Previous->is(TT_InheritanceColon)) {
    Contexts.back().InInheritanceList = true;
  } else if (Current.isOneOf(tok::r_paren, tok::greater, tok::comma)) {
    for (FormatToken *Previous = Current.Previous;
         Previous && Previous->isOneOf(tok::star, tok::amp);
         Previous = Previous->Previous)
      Previous->setType(TT_PointerOrReference);
    if (Line.MustBeDeclaration && !Contexts.front().InCtorInitializer)
      Contexts.back().IsExpression = false;
  } else if (Current.is(tok::kw_new)) {
    Contexts.back().CanBeExpression = false;
  } else if (Current.is(tok::semi) ||
             (Current.is(tok::exclaim) && Current.Previous &&
              !Current.Previous->is(tok::kw_operator))) {
    // This should be the condition or increment in a for-loop.
    // But not operator !() (can't use TT_OverloadedOperator here as its not
    // been annotated yet).
    Contexts.back().IsExpression = true;
  }
}

static FormatToken *untilMatchingParen(FormatToken *Current) {
  // Used when `MatchingParen` is not yet established.
  int ParenLevel = 0;
  while (Current) {
    if (Current->is(tok::l_paren))
      ++ParenLevel;
    if (Current->is(tok::r_paren))
      --ParenLevel;
    if (ParenLevel < 1)
      break;
    Current = Current->Next;
  }
  return Current;
}

static bool isDeductionGuide(FormatToken &Current) {
  // Look for a deduction guide template<T> A(...) -> A<...>;
  if (Current.Previous && Current.Previous->is(tok::r_paren) &&
      Current.startsSequence(tok::arrow, tok::identifier, tok::less)) {
    // Find the TemplateCloser.
    FormatToken *TemplateCloser = Current.Next->Next;
    int NestingLevel = 0;
    while (TemplateCloser) {
      // Skip over an expressions in parens  A<(3 < 2)>;
      if (TemplateCloser->is(tok::l_paren)) {
        // No Matching Paren yet so skip to matching paren
        TemplateCloser = untilMatchingParen(TemplateCloser);
        if (!TemplateCloser)
          break;
      }
      if (TemplateCloser->is(tok::less))
        ++NestingLevel;
      if (TemplateCloser->is(tok::greater))
        --NestingLevel;
      if (NestingLevel < 1)
        break;
      TemplateCloser = TemplateCloser->Next;
    }
    // Assuming we have found the end of the template ensure its followed
    // with a semi-colon.
    if (TemplateCloser && TemplateCloser->Next &&
        TemplateCloser->Next->is(tok::semi) &&
        Current.Previous->MatchingParen) {
      // Determine if the identifier `A` prior to the A<..>; is the same as
      // prior to the A(..)
      FormatToken *LeadingIdentifier =
          Current.Previous->MatchingParen->Previous;

      // Differentiate a deduction guide by seeing the
      // > of the template prior to the leading identifier.
      if (LeadingIdentifier) {
        FormatToken *PriorLeadingIdentifier = LeadingIdentifier->Previous;
        // Skip back past explicit decoration
        if (PriorLeadingIdentifier &&
            PriorLeadingIdentifier->is(tok::kw_explicit))
          PriorLeadingIdentifier = PriorLeadingIdentifier->Previous;

        return (PriorLeadingIdentifier &&
                PriorLeadingIdentifier->is(TT_TemplateCloser) &&
                LeadingIdentifier->TokenText == Current.Next->TokenText);
      }
    }
  }
  return false;
}

void determineTokenType(FormatToken &Current) {
  if (!Current.is(TT_Unknown))
    // The token type is already known.
    return;

  if ((Style.isJavaScript() || Style.isCSharp()) &&
      Current.is(tok::exclaim)) {
    if (Current.Previous) {
      bool IsIdentifier =
          Style.isJavaScript()
              ? Keywords.IsJavaScriptIdentifier(
                    *Current.Previous, /* AcceptIdentifierName= */ true)
              : Current.Previous->is(tok::identifier);
      if (IsIdentifier ||
          Current.Previous->isOneOf(
              tok::kw_namespace, tok::r_paren, tok::r_square, tok::r_brace,
              tok::kw_false, tok::kw_true, Keywords.kw_type, Keywords.kw_get,
              Keywords.kw_set) ||
          Current.Previous->Tok.isLiteral()) {
        Current.setType(TT_NonNullAssertion);
        return;
      }
    }
    if (Current.Next &&
        Current.Next->isOneOf(TT_BinaryOperator, Keywords.kw_as)) {
      Current.setType(TT_NonNullAssertion);
      return;
    }
  }

  // Line.MightBeFunctionDecl can only be true after the parentheses of a
  // function declaration have been found. In this case, 'Current' is a
  // trailing token of this declaration and thus cannot be a name.
  if (Current.is(Keywords.kw_instanceof)) {
    Current.setType(TT_BinaryOperator);
  } else if (isStartOfName(Current) &&
             (!Line.MightBeFunctionDecl || Current.NestingLevel != 0)) {
    Contexts.back().FirstStartOfName = &Current;
    Current.setType(TT_StartOfName);
  } else if (Current.is(tok::semi)) {
    // Reset FirstStartOfName after finding a semicolon so that a for loop
    // with multiple increment statements is not confused with a for loop
    // having multiple variable declarations.
    Contexts.back().FirstStartOfName = nullptr;
  } else if (Current.isOneOf(tok::kw_auto, tok::kw___auto_type)) {
    AutoFound = true;
  } else if (Current.is(tok::arrow) &&
             Style.Language == FormatStyle::LK_Java) {
    Current.setType(TT_LambdaArrow);
  } else if (Current.is(tok::arrow) && AutoFound && Line.MustBeDeclaration &&
             Current.NestingLevel == 0 &&
             !Current.Previous->isOneOf(tok::kw_operator, tok::identifier)) {
    // not auto operator->() -> xxx;
    Current.setType(TT_TrailingReturnArrow);
  } else if (Current.is(tok::arrow) && Current.Previous &&
             Current.Previous->is(tok::r_brace)) {
    // Concept implicit conversion constraint needs to be treated like
    // a trailing return type  ... } -> <type>.
    Current.setType(TT_TrailingReturnArrow);
  } else if (isDeductionGuide(Current)) {
    // Deduction guides trailing arrow " A(...) -> A<T>;".
    Current.setType(TT_TrailingReturnArrow);
  } else if (Current.isOneOf(tok::star, tok::amp, tok::ampamp)) {
    Current.setType(determineStarAmpUsage(
        Current,
        Contexts.back().CanBeExpression && Contexts.back().IsExpression,
        Contexts.back().InTemplateArgument));
  } else if (Current.isOneOf(tok::minus, tok::plus, tok::caret)) {
    Current.setType(determinePlusMinusCaretUsage(Current));
    if (Current.is(TT_UnaryOperator) && Current.is(tok::caret))
      Contexts.back().CaretFound = true;
  } else if (Current.isOneOf(tok::minusminus, tok::plusplus)) {
    Current.setType(determineIncrementUsage(Current));
  } else if (Current.isOneOf(tok::exclaim, tok::tilde)) {
    Current.setType(TT_UnaryOperator);
  } else if (Current.is(tok::question)) {
    if (Style.isJavaScript() && Line.MustBeDeclaration &&
        !Contexts.back().IsExpression) {
      // In JavaScript, `interface X { foo?(): bar; }` is an optional method
      // on the interface, not a ternary expression.
      Current.setType(TT_JsTypeOptionalQuestion);
    } else {
      Current.setType(TT_ConditionalExpr);
    }
  } else if (Current.isBinaryOperator() &&
             (!Current.Previous || Current.Previous->isNot(tok::l_square)) &&
             (!Current.is(tok::greater) &&
              Style.Language != FormatStyle::LK_TextProto)) {
    Current.setType(TT_BinaryOperator);
  } else if (Current.is(tok::comment)) {
    if (Current.TokenText.startswith("/*")) {
      if (Current.TokenText.endswith("*/"))
        Current.setType(TT_BlockComment);
      else
        // The lexer has for some reason determined a comment here. But we
        // cannot really handle it, if it isn't properly terminated.
        Current.Tok.setKind(tok::unknown);
    } else {
      Current.setType(TT_LineComment);
    }
  } else if (Current.is(tok::r_paren)) {
    if (rParenEndsCast(Current))
      Current.setType(TT_CastRParen);
    if (Current.MatchingParen && Current.Next &&
        !Current.Next->isBinaryOperator() &&
        !Current.Next->isOneOf(tok::semi, tok::colon, tok::l_brace,
                               tok::comma, tok::period, tok::arrow,
                               tok::coloncolon))
      if (FormatToken *AfterParen = Current.MatchingParen->Next) {
        // Make sure this isn't the return type of an Obj-C block declaration
        if (AfterParen->Tok.isNot(tok::caret)) {
          if (FormatToken *BeforeParen = Current.MatchingParen->Previous)
            if (BeforeParen->is(tok::identifier) &&
                !BeforeParen->is(TT_TypenameMacro) &&
                BeforeParen->TokenText == BeforeParen->TokenText.upper() &&
                (!BeforeParen->Previous ||
                 BeforeParen->Previous->ClosesTemplateDeclaration))
              Current.setType(TT_FunctionAnnotationRParen);
        }
      }
  } else if (Current.is(tok::at) && Current.Next && !Style.isJavaScript() &&
             Style.Language != FormatStyle::LK_Java) {
    // In Java & JavaScript, "@..." is a decorator or annotation. In ObjC, it
    // marks declarations and properties that need special formatting.
    switch (Current.Next->Tok.getObjCKeywordID()) {
    case tok::objc_interface:
    case tok::objc_implementation:
    case tok::objc_protocol:
      Current.setType(TT_ObjCDecl);
      break;
    case tok::objc_property:
      Current.setType(TT_ObjCProperty);
      break;
    default:
      break;
    }
  } else if (Current.is(tok::period)) {
    FormatToken *PreviousNoComment = Current.getPreviousNonComment();
    if (PreviousNoComment &&
        PreviousNoComment->isOneOf(tok::comma, tok::l_brace))
      Current.setType(TT_DesignatedInitializerPeriod);
    else if (Style.Language == FormatStyle::LK_Java && Current.Previous &&
             Current.Previous->isOneOf(TT_JavaAnnotation,
                                       TT_LeadingJavaAnnotation)) {
      Current.setType(Current.Previous->getType());
    }
  } else if (canBeObjCSelectorComponent(Current) &&
             // FIXME(bug 36976): ObjC return types shouldn't use
             // TT_CastRParen.
             Current.Previous && Current.Previous->is(TT_CastRParen) &&
             Current.Previous->MatchingParen &&
             Current.Previous->MatchingParen->Previous &&
             Current.Previous->MatchingParen->Previous->is(
                 TT_ObjCMethodSpecifier)) {
    // This is the first part of an Objective-C selector name. (If there's no
    // colon after this, this is the only place which annotates the identifier
    // as a selector.)
    Current.setType(TT_SelectorName);
  } else if (Current.isOneOf(tok::identifier, tok::kw_const, tok::kw_noexcept,
                             tok::kw_requires) &&
             Current.Previous &&
             !Current.Previous->isOneOf(tok::equal, tok::at) &&
             Line.MightBeFunctionDecl && Contexts.size() == 1) {
    // Line.MightBeFunctionDecl can only be true after the parentheses of a
    // function declaration have been found.
    Current.setType(TT_TrailingAnnotation);
  } else if ((Style.Language == FormatStyle::LK_Java ||
              Style.isJavaScript()) &&
             Current.Previous) {
    if (Current.Previous->is(tok::at) &&
        Current.isNot(Keywords.kw_interface)) {
      const FormatToken &AtToken = *Current.Previous;
      const FormatToken *Previous = AtToken.getPreviousNonComment();
      if (!Previous || Previous->is(TT_LeadingJavaAnnotation))
        Current.setType(TT_LeadingJavaAnnotation);
      else
        Current.setType(TT_JavaAnnotation);
    } else if (Current.Previous->is(tok::period) &&
               Current.Previous->isOneOf(TT_JavaAnnotation,
                                         TT_LeadingJavaAnnotation)) {
      Current.setType(Current.Previous->getType());
    }
  }
}

/// Take a guess at whether \p Tok starts a name of a function or
/// variable declaration.
///
/// This is a heuristic based on whether \p Tok is an identifier following
/// something that is likely a type.
bool isStartOfName(const FormatToken &Tok) {
  if (Tok.isNot(tok::identifier) || !Tok.Previous)
    return false;

  if (Tok.Previous->isOneOf(TT_LeadingJavaAnnotation, Keywords.kw_instanceof,
                            Keywords.kw_as))
    return false;
  if (Style.isJavaScript() && Tok.Previous->is(Keywords.kw_in))
    return false;

  // Skip "const" as it does not have an influence on whether this is a name.
  FormatToken *PreviousNotConst = Tok.getPreviousNonComment();

  // For javascript const can be like "let" or "var"
  if (!Style.isJavaScript())
    while (PreviousNotConst && PreviousNotConst->is(tok::kw_const))
      PreviousNotConst = PreviousNotConst->getPreviousNonComment();

  if (!PreviousNotConst)
    return false;

  bool IsPPKeyword = PreviousNotConst->is(tok::identifier) &&
                     PreviousNotConst->Previous &&
                     PreviousNotConst->Previous->is(tok::hash);

  if (PreviousNotConst->is(TT_TemplateCloser))
    return PreviousNotConst && PreviousNotConst->MatchingParen &&
           PreviousNotConst->MatchingParen->Previous &&
           PreviousNotConst->MatchingParen->Previous->isNot(tok::period) &&
           PreviousNotConst->MatchingParen->Previous->isNot(tok::kw_template);

  if (PreviousNotConst->is(tok::r_paren) &&
      PreviousNotConst->is(TT_TypeDeclarationParen))
    return true;

  // If is a preprocess keyword like #define.
  if (IsPPKeyword)
    return false;

  // int a or auto a.
  if (PreviousNotConst->isOneOf(tok::identifier, tok::kw_auto))
    return true;

  // *a or &a or &&a.
  if (PreviousNotConst->is(TT_PointerOrReference))
    return true;

  // MyClass a;
  if (PreviousNotConst->isSimpleTypeSpecifier())
    return true;

  // const a = in JavaScript.
  return (Style.isJavaScript() && PreviousNotConst->is(tok::kw_const));
}

/// Determine whether ')' is ending a cast.
bool rParenEndsCast(const FormatToken &Tok) {
  // C-style casts are only used in C++, C# and Java.
  if (!Style.isCSharp() && !Style.isCpp() &&
      Style.Language != FormatStyle::LK_Java)
    return false;

  // 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)
    return false;

  FormatToken *LeftOfParens = Tok.MatchingParen->getPreviousNonComment();
  if (LeftOfParens) {
    // If there is a closing parenthesis left of the current
    // parentheses, look past it as these might be chained casts.
    if (LeftOfParens->is(tok::r_paren) &&
        LeftOfParens->isNot(TT_CastRParen)) {
      if (!LeftOfParens->MatchingParen ||
          !LeftOfParens->MatchingParen->Previous)
        return false;
      LeftOfParens = LeftOfParens->MatchingParen->Previous;
    }

    // The Condition directly below this one will see the operator arguments
    // as a (void *foo) cast.
    //   void operator delete(void *foo) ATTRIB;
    if (LeftOfParens->Tok.getIdentifierInfo() && LeftOfParens->Previous &&
        LeftOfParens->Previous->is(tok::kw_operator))
      return false;

    // If there is an identifier (or with a few exceptions a keyword) right
    // before the parentheses, this is unlikely to be a cast.
    if (LeftOfParens->Tok.getIdentifierInfo() &&
        !LeftOfParens->isOneOf(Keywords.kw_in, tok::kw_return, tok::kw_case,
                               tok::kw_delete))
      return false;

    // Certain other tokens right before the parentheses are also signals that
    // this cannot be a cast.
    if (LeftOfParens->isOneOf(tok::at, tok::r_square, TT_OverloadedOperator,
                              TT_TemplateCloser, tok::ellipsis))
      return false;
  }

  if (Tok.Next->is(tok::question))
    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())
    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) ||
      isCpp11AttributeSpecifier(*Tok.Next))
    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))
    return true;

  // If a (non-string) literal follows, this is likely a cast.
  if (Tok.Next->isNot(tok::string_literal) &&
      (Tok.Next->Tok.isLiteral() ||
       Tok.Next->isOneOf(tok::kw_sizeof, tok::kw_alignof)))
    return true;

  // Heuristically try to determine whether the parentheses contain a type.
  auto IsQualifiedPointerOrReference = [](FormatToken *T) {
    // This is used to handle cases such as x = (foo *const)&y;
    assert(!T->isSimpleTypeSpecifier() && "Should have already been checked")(static_cast <bool> (!T->isSimpleTypeSpecifier() &&
 "Should have already been checked") ? void (0) : __assert_fail
 ("!T->isSimpleTypeSpecifier() && \"Should have already been checked\""
, "clang/lib/Format/TokenAnnotator.cpp", 1947, __extension__ __PRETTY_FUNCTION__
));
    // Strip trailing qualifiers such as const or volatile when checking
    // whether the parens could be a cast to a pointer/reference type.
    while (T) {
      if (T->is(TT_AttributeParen)) {
        // Handle `x = (foo *__attribute__((foo)))&v;`:
        if (T->MatchingParen && T->MatchingParen->Previous &&
            T->MatchingParen->Previous->is(tok::kw___attribute)) {
          T = T->MatchingParen->Previous->Previous;
          continue;
        }
      } else if (T->is(TT_AttributeSquare)) {
        // Handle `x = (foo *[[clang::foo]])&v;`:
        if (T->MatchingParen && T->MatchingParen->Previous) {
          T = T->MatchingParen->Previous;
          continue;
        }
      } else if (T->canBePointerOrReferenceQualifier()) {
        T = T->Previous;
        continue;
      }
      break;
    }
    return T && T->is(TT_PointerOrReference);
  };
  bool ParensAreType =
      !Tok.Previous ||
      Tok.Previous->isOneOf(TT_TemplateCloser, TT_TypeDeclarationParen) ||
      Tok.Previous->isSimpleTypeSpecifier() ||
      IsQualifiedPointerOrReference(Tok.Previous);
  bool ParensCouldEndDecl =
      Tok.Next->isOneOf(tok::equal, tok::semi, tok::l_brace, tok::greater);
  if (ParensAreType && !ParensCouldEndDecl)
    return true;

  // At this point, we heuristically assume that there are no casts at the
  // start of the line. We assume that we have found most cases where there
  // are by the logic above, e.g. "(void)x;".
  if (!LeftOfParens)
    return false;

  // 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)
    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))
    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))
      return true;
  }

  if (!Tok.Next->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.
  bool NextIsUnary =
      Tok.Next->isUnaryOperator() || Tok.Next->isOneOf(tok::amp, tok::star);
  if (!NextIsUnary || Tok.Next->is(tok::plus) ||
      !Tok.Next->Next->isOneOf(tok::identifier, tok::numeric_constant))
    return false;
  // Search for unexpected tokens.
  for (FormatToken *Prev = Tok.Previous; Prev != Tok.MatchingParen;
       Prev = Prev->Previous) {
    if (!Prev->isOneOf(tok::kw_const, tok::identifier, tok::coloncolon))
      return false;
  }
  return true;
}

/// Return the type of the given token assuming it is * or &.
TokenType determineStarAmpUsage(const FormatToken &Tok, bool IsExpression,
                                bool InTemplateArgument) {
  if (Style.isJavaScript())
    return TT_BinaryOperator;

  // && in C# must be a binary operator.
  if (Style.isCSharp() && Tok.is(tok::ampamp))
    return TT_BinaryOperator;

  const FormatToken *PrevToken = Tok.getPreviousNonComment();
  if (!PrevToken)
    return TT_UnaryOperator;

  const FormatToken *NextToken = Tok.getNextNonComment();
  if (!NextToken ||
      NextToken->isOneOf(tok::arrow, tok::equal, tok::kw_noexcept) ||
      NextToken->canBePointerOrReferenceQualifier() ||
      (NextToken->is(tok::l_brace) && !NextToken->getNextNonComment()))
    return TT_PointerOrReference;

  if (PrevToken->is(tok::coloncolon))
    return TT_PointerOrReference;

  if (PrevToken->is(tok::r_paren) && PrevToken->is(TT_TypeDeclarationParen))
    return TT_PointerOrReference;

  if (PrevToken->isOneOf(tok::l_paren, tok::l_square, tok::l_brace,
                         tok::comma, tok::semi, tok::kw_return, tok::colon,
                         tok::kw_co_return, tok::kw_co_await,
                         tok::kw_co_yield, tok::equal, tok::kw_delete,
                         tok::kw_sizeof, tok::kw_throw, TT_BinaryOperator,
                         TT_ConditionalExpr, TT_UnaryOperator, TT_CastRParen))
    return TT_UnaryOperator;

  if (NextToken->is(tok::l_square) && NextToken->isNot(TT_LambdaLSquare))
    return TT_PointerOrReference;
  if (NextToken->is(tok::kw_operator) && !IsExpression)
    return TT_PointerOrReference;
  if (NextToken->isOneOf(tok::comma, tok::semi))
    return TT_PointerOrReference;

  if (PrevToken->Tok.isLiteral() ||
      PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::kw_true,
                         tok::kw_false, tok::r_brace) ||
      NextToken->Tok.isLiteral() ||
      NextToken->isOneOf(tok::kw_true, tok::kw_false) ||
      NextToken->isUnaryOperator() ||
      // If we know we're in a template argument, there are no named
      // declarations. Thus, having an identifier on the right-hand side
      // indicates a binary operator.
      (InTemplateArgument && NextToken->Tok.isAnyIdentifier()))
    return TT_BinaryOperator;

  // "&&(" is quite unlikely to be two successive unary "&".
  if (Tok.is(tok::ampamp) && NextToken->is(tok::l_paren))
    return TT_BinaryOperator;

  // This catches some cases where evaluation order is used as control flow:
  //   aaa && aaa->f();
  if (NextToken->Tok.isAnyIdentifier()) {
    const FormatToken *NextNextToken = NextToken->getNextNonComment();
    if (NextNextToken && NextNextToken->is(tok::arrow))
      return TT_BinaryOperator;
  }

  // It is very unlikely that we are going to find a pointer or reference type
  // definition on the RHS of an assignment.
  if (IsExpression && !Contexts.back().CaretFound)
    return TT_BinaryOperator;

  return TT_PointerOrReference;
}

TokenType determinePlusMinusCaretUsage(const FormatToken &Tok) {
  const FormatToken *PrevToken = Tok.getPreviousNonComment();
  if (!PrevToken)
    return TT_UnaryOperator;

  if (PrevToken->isOneOf(TT_CastRParen, TT_UnaryOperator))
    // This must be a sequence of leading unary operators.
    return TT_UnaryOperator;

  // Use heuristics to recognize unary operators.
  if (PrevToken->isOneOf(tok::equal, tok::l_paren, tok::comma, tok::l_square,
                         tok::question, tok::colon, tok::kw_return,
                         tok::kw_case, tok::at, tok::l_brace, tok::kw_throw,
                         tok::kw_co_return, tok::kw_co_yield))
    return TT_UnaryOperator;

  // There can't be two consecutive binary operators.
  if (PrevToken->is(TT_BinaryOperator))
    return TT_UnaryOperator;

  // Fall back to marking the token as binary operator.
  return TT_BinaryOperator;
}

/// Determine whether ++/-- are pre- or post-increments/-decrements.
TokenType determineIncrementUsage(const FormatToken &Tok) {
  const FormatToken *PrevToken = Tok.getPreviousNonComment();
  if (!PrevToken || PrevToken->is(TT_CastRParen))
    return TT_UnaryOperator;
  if (PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::identifier))
    return TT_TrailingUnaryOperator;

  return TT_UnaryOperator;
}

SmallVector<Context, 8> Contexts;

const FormatStyle &Style;
AnnotatedLine &Line;
FormatToken *CurrentToken;
bool AutoFound;
const AdditionalKeywords &Keywords;

// Set of "<" tokens that do not open a template parameter list. If parseAngle
// determines that a specific token can't be a template opener, it will make
// same decision irrespective of the decisions for tokens leading up to it.
// Store this information to prevent this from causing exponential runtime.
llvm::SmallPtrSet<FormatToken *, 16> NonTemplateLess;
2149};

2151static const int PrecedenceUnaryOperator = prec::PointerToMember + 1;
2152static const int PrecedenceArrowAndPeriod = prec::PointerToMember + 2;

2154/// Parses binary expressions by inserting fake parenthesis based on
2155/// operator precedence.
2156class ExpressionParser {
2157public:
ExpressionParser(const FormatStyle &Style, const AdditionalKeywords &Keywords,
                 AnnotatedLine &Line)
    : Style(Style), Keywords(Keywords), Current(Line.First) {}

/// Parse expressions with the given operator precedence.
void parse(int Precedence = 0) {
  // Skip 'return' and ObjC selector colons as they are not part of a binary
  // expression.
  while (Current && (Current->is(tok::kw_return) ||
                     (Current->is(tok::colon) &&
                      Current->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral))))
    next();

  if (!Current || Precedence > PrecedenceArrowAndPeriod)
    return;

  // Conditional expressions need to be parsed separately for proper nesting.
  if (Precedence == prec::Conditional) {
    parseConditionalExpr();
    return;
  }

  // Parse unary operators, which all have a higher precedence than binary
  // operators.
  if (Precedence == PrecedenceUnaryOperator) {
    parseUnaryOperator();
    return;
  }

  FormatToken *Start = Current;
  FormatToken *LatestOperator = nullptr;
  unsigned OperatorIndex = 0;

  while (Current) {
    // Consume operators with higher precedence.
    parse(Precedence + 1);

    int CurrentPrecedence = getCurrentPrecedence();

    if (Precedence == CurrentPrecedence && Current &&
        Current->is(TT_SelectorName)) {
      if (LatestOperator)
        addFakeParenthesis(Start, prec::Level(Precedence));
      Start = Current;
    }

    // At the end of the line or when an operator with higher precedence is
    // found, insert fake parenthesis and return.
    if (!Current ||
        (Current->closesScope() &&
         (Current->MatchingParen || Current->is(TT_TemplateString))) ||
        (CurrentPrecedence != -1 && CurrentPrecedence < Precedence) ||
        (CurrentPrecedence == prec::Conditional &&
         Precedence == prec::Assignment && Current->is(tok::colon))) {
      break;
    }

    // Consume scopes: (), [], <> and {}
    if (Current->opensScope()) {
      // In fragment of a JavaScript template string can look like '}..${' and
      // thus close a scope and open a new one at the same time.
      while (Current && (!Current->closesScope() || Current->opensScope())) {
        next();
        parse();
      }
      next();
    } else {
      // Operator found.
      if (CurrentPrecedence == Precedence) {
        if (LatestOperator)
          LatestOperator->NextOperator = Current;
        LatestOperator = Current;
        Current->OperatorIndex = OperatorIndex;
        ++OperatorIndex;
      }
      next(/*SkipPastLeadingComments=*/Precedence > 0);
    }
  }

  if (LatestOperator && (Current || Precedence > 0)) {
    // LatestOperator->LastOperator = true;
    if (Precedence == PrecedenceArrowAndPeriod) {
      // Call expressions don't have a binary operator precedence.
      addFakeParenthesis(Start, prec::Unknown);
    } else {
      addFakeParenthesis(Start, prec::Level(Precedence));
    }
  }
}

2248private:
/// Gets the precedence (+1) of the given token for binary operators
/// and other tokens that we treat like binary operators.
int getCurrentPrecedence() {
  if (Current) {
    const FormatToken *NextNonComment = Current->getNextNonComment();
    if (Current->is(TT_ConditionalExpr))
      return prec::Conditional;
    if (NextNonComment && Current->is(TT_SelectorName) &&
        (NextNonComment->isOneOf(TT_DictLiteral, TT_JsTypeColon) ||
         ((Style.Language == FormatStyle::LK_Proto ||
           Style.Language == FormatStyle::LK_TextProto) &&
          NextNonComment->is(tok::less))))
      return prec::Assignment;
    if (Current->is(TT_JsComputedPropertyName))
      return prec::Assignment;
    if (Current->is(TT_LambdaArrow))
      return prec::Comma;
    if (Current->is(TT_FatArrow))
      return prec::Assignment;
    if (Current->isOneOf(tok::semi, TT_InlineASMColon, TT_SelectorName) ||
        (Current->is(tok::comment) && NextNonComment &&
         NextNonComment->is(TT_SelectorName)))
      return 0;
    if (Current->is(TT_RangeBasedForLoopColon))
      return prec::Comma;
    if ((Style.Language == FormatStyle::LK_Java || Style.isJavaScript()) &&
        Current->is(Keywords.kw_instanceof))
      return prec::Relational;
    if (Style.isJavaScript() &&
        Current->isOneOf(Keywords.kw_in, Keywords.kw_as))
      return prec::Relational;
    if (Current->is(TT_BinaryOperator) || Current->is(tok::comma))
      return Current->getPrecedence();
    if (Current->isOneOf(tok::period, tok::arrow))
      return PrecedenceArrowAndPeriod;
    if ((Style.Language == FormatStyle::LK_Java || Style.isJavaScript()) &&
        Current->isOneOf(Keywords.kw_extends, Keywords.kw_implements,
                         Keywords.kw_throws))
      return 0;
  }
  return -1;
}

void addFakeParenthesis(FormatToken *Start, prec::Level Precedence) {
  Start->FakeLParens.push_back(Precedence);
  if (Precedence > prec::Unknown)
    Start->StartsBinaryExpression = true;
  if (Current) {
    FormatToken *Previous = Current->Previous;
    while (Previous->is(tok::comment) && Previous->Previous)
      Previous = Previous->Previous;
    ++Previous->FakeRParens;
    if (Precedence > prec::Unknown)
      Previous->EndsBinaryExpression = true;
  }
}

/// Parse unary operator expressions and surround them with fake
/// parentheses if appropriate.
void parseUnaryOperator() {
  llvm::SmallVector<FormatToken *, 2> Tokens;
  while (Current && Current->is(TT_UnaryOperator)) {
    Tokens.push_back(Current);
    next();
  }
  parse(PrecedenceArrowAndPeriod);
  for (FormatToken *Token : llvm::reverse(Tokens))
    // The actual precedence doesn't matter.
    addFakeParenthesis(Token, prec::Unknown);
}

void parseConditionalExpr() {
  while (Current && Current->isTrailingComment()) {
    next();
  }
  FormatToken *Start = Current;
  parse(prec::LogicalOr);
  if (!Current || !Current->is(tok::question))
    return;
  next();
  parse(prec::Assignment);
  if (!Current || Current->isNot(TT_ConditionalExpr))
    return;
  next();
  parse(prec::Assignment);
  addFakeParenthesis(Start, prec::Conditional);
}

void next(bool SkipPastLeadingComments = true) {
  if (Current)
    Current = Current->Next;
  while (Current &&
         (Current->NewlinesBefore == 0 || SkipPastLeadingComments) &&
         Current->isTrailingComment())
    Current = Current->Next;
}

const FormatStyle &Style;
const AdditionalKeywords &Keywords;
FormatToken *Current;
2349};

2351} // end anonymous namespace

2353void TokenAnnotator::setCommentLineLevels(
  SmallVectorImpl<AnnotatedLine *> &Lines) {
const AnnotatedLine *NextNonCommentLine = nullptr;
for (AnnotatedLine *AL : llvm::reverse(Lines)) {
  bool CommentLine = true;
  for (const FormatToken *Tok = AL->First; Tok; Tok = Tok->Next) {
1
Assuming pointer value is null→
    if (!Tok->is(tok::comment)) {
      CommentLine = false;
      break;
    }
  }

  // If the comment is currently aligned with the line immediately following
  // it, that's probably intentional and we should keep it.
  if (NextNonCommentLine1.1
'NextNonCommentLine' is null
 && CommentLine &&
      NextNonCommentLine->First->NewlinesBefore <= 1 &&
      NextNonCommentLine->First->OriginalColumn ==
          AL->First->OriginalColumn) {
    // Align comments for preprocessor lines with the # in column 0 if
    // preprocessor lines are not indented. Otherwise, align with the next
    // line.
    AL->Level = (Style.IndentPPDirectives != FormatStyle::PPDIS_BeforeHash &&
                 (NextNonCommentLine->Type == LT_PreprocessorDirective ||
                  NextNonCommentLine->Type == LT_ImportStatement))
                    ? 0
                    : NextNonCommentLine->Level;
  } else {
    NextNonCommentLine = AL->First->isNot(tok::r_brace) ? AL : nullptr;
2
←
Called C++ object pointer is null
  }

  setCommentLineLevels(AL->Children);
}
2385}

2387static unsigned maxNestingDepth(const AnnotatedLine &Line) {
unsigned Result = 0;
for (const auto *Tok = Line.First; Tok != nullptr; Tok = Tok->Next)
  Result = std::max(Result, Tok->NestingLevel);
return Result;
2392}

2394void TokenAnnotator::annotate(AnnotatedLine &Line) {
for (auto &Child : Line.Children)
  annotate(*Child);

AnnotatingParser Parser(Style, Line, Keywords);
Line.Type = Parser.parseLine();

// With very deep nesting, ExpressionParser uses lots of stack and the
// formatting algorithm is very slow. We're not going to do a good job here
// anyway - it's probably generated code being formatted by mistake.
// Just skip the whole line.
if (maxNestingDepth(Line) > 50)
  Line.Type = LT_Invalid;

if (Line.Type == LT_Invalid)
  return;

ExpressionParser ExprParser(Style, Keywords, Line);
ExprParser.parse();

if (Line.startsWith(TT_ObjCMethodSpecifier))
  Line.Type = LT_ObjCMethodDecl;
else if (Line.startsWith(TT_ObjCDecl))
  Line.Type = LT_ObjCDecl;
else if (Line.startsWith(TT_ObjCProperty))
  Line.Type = LT_ObjCProperty;

Line.First->SpacesRequiredBefore = 1;
Line.First->CanBreakBefore = Line.First->MustBreakBefore;
2423}

2425// This function heuristically determines whether 'Current' starts the name of a
2426// function declaration.
2427static bool isFunctionDeclarationName(bool IsCpp, const FormatToken &Current,
                                    const AnnotatedLine &Line) {
auto skipOperatorName = [](const FormatToken *Next) -> const FormatToken * {
  for (; Next; Next = Next->Next) {
    if (Next->is(TT_OverloadedOperatorLParen))
      return Next;
    if (Next->is(TT_OverloadedOperator))
      continue;
    if (Next->isOneOf(tok::kw_new, tok::kw_delete)) {
      // For 'new[]' and 'delete[]'.
      if (Next->Next &&
          Next->Next->startsSequence(tok::l_square, tok::r_square))
        Next = Next->Next->Next;
      continue;
    }
    if (Next->startsSequence(tok::l_square, tok::r_square)) {
      // For operator[]().
      Next = Next->Next;
      continue;
    }
    if ((Next->isSimpleTypeSpecifier() || Next->is(tok::identifier)) &&
        Next->Next && Next->Next->isOneOf(tok::star, tok::amp, tok::ampamp)) {
      // For operator void*(), operator char*(), operator Foo*().
      Next = Next->Next;
      continue;
    }
    if (Next->is(TT_TemplateOpener) && Next->MatchingParen) {
      Next = Next->MatchingParen;
      continue;
    }

    break;
  }
  return nullptr;
};

// Find parentheses of parameter list.
const FormatToken *Next = Current.Next;
if (Current.is(tok::kw_operator)) {
  if (Current.Previous && Current.Previous->is(tok::coloncolon))
    return false;
  Next = skipOperatorName(Next);
} else {
  if (!Current.is(TT_StartOfName) || Current.NestingLevel != 0)
    return false;
  for (; Next; Next = Next->Next) {
    if (Next->is(TT_TemplateOpener)) {
      Next = Next->MatchingParen;
    } else if (Next->is(tok::coloncolon)) {
      Next = Next->Next;
      if (!Next)
        return false;
      if (Next->is(tok::kw_operator)) {
        Next = skipOperatorName(Next->Next);
        break;
      }
      if (!Next->is(tok::identifier))
        return false;
    } else if (Next->is(tok::l_paren)) {
      break;
    } else {
      return false;
    }
  }
}

// Check whether parameter list can belong to a function declaration.
if (!Next || !Next->is(tok::l_paren) || !Next->MatchingParen)
  return false;
// If the lines ends with "{", this is likely a function definition.
if (Line.Last->is(tok::l_brace))
  return true;
if (Next->Next == Next->MatchingParen)
  return true; // Empty parentheses.
// If there is an &/&& after the r_paren, this is likely a function.
if (Next->MatchingParen->Next &&
    Next->MatchingParen->Next->is(TT_PointerOrReference))
  return true;

// Check for K&R C function definitions (and C++ function definitions with
// unnamed parameters), e.g.:
//   int f(i)
//   {
//     return i + 1;
//   }
//   bool g(size_t = 0, bool b = false)
//   {
//     return !b;
//   }
if (IsCpp && Next->Next && Next->Next->is(tok::identifier) &&
    !Line.endsWith(tok::semi))
  return true;

for (const FormatToken *Tok = Next->Next; Tok && Tok != Next->MatchingParen;
     Tok = Tok->Next) {
  if (Tok->is(TT_TypeDeclarationParen))
    return true;
  if (Tok->isOneOf(tok::l_paren, TT_TemplateOpener) && Tok->MatchingParen) {
    Tok = Tok->MatchingParen;
    continue;
  }
  if (Tok->is(tok::kw_const) || Tok->isSimpleTypeSpecifier() ||
      Tok->isOneOf(TT_PointerOrReference, TT_StartOfName, tok::ellipsis))
    return true;
  if (Tok->isOneOf(tok::l_brace, tok::string_literal, TT_ObjCMethodExpr) ||
      Tok->Tok.isLiteral())
    return false;
}
return false;
2536}

2538bool TokenAnnotator::mustBreakForReturnType(const AnnotatedLine &Line) const {
assert(Line.MightBeFunctionDecl)(static_cast <bool> (Line.MightBeFunctionDecl) ? void (
0) : __assert_fail ("Line.MightBeFunctionDecl", "clang/lib/Format/TokenAnnotator.cpp"
, 2539, __extension__ __PRETTY_FUNCTION__));

if ((Style.AlwaysBreakAfterReturnType == FormatStyle::RTBS_TopLevel ||
     Style.AlwaysBreakAfterReturnType ==
         FormatStyle::RTBS_TopLevelDefinitions) &&
    Line.Level > 0)
  return false;

switch (Style.AlwaysBreakAfterReturnType) {
case FormatStyle::RTBS_None:
  return false;
case FormatStyle::RTBS_All:
case FormatStyle::RTBS_TopLevel:
  return true;
case FormatStyle::RTBS_AllDefinitions:
case FormatStyle::RTBS_TopLevelDefinitions:
  return Line.mightBeFunctionDefinition();
}

return false;
2559}

2561void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) {
for (AnnotatedLine *ChildLine : Line.Children)
  calculateFormattingInformation(*ChildLine);

Line.First->TotalLength =
    Line.First->IsMultiline ? Style.ColumnLimit
                            : Line.FirstStartColumn + Line.First->ColumnWidth;
FormatToken *Current = Line.First->Next;
bool InFunctionDecl = Line.MightBeFunctionDecl;
bool AlignArrayOfStructures =
    (Style.AlignArrayOfStructures != FormatStyle::AIAS_None &&
     Line.Type == LT_ArrayOfStructInitializer);
if (AlignArrayOfStructures)
  calculateArrayInitializerColumnList(Line);

while (Current) {
  if (isFunctionDeclarationName(Style.isCpp(), *Current, Line))
    Current->setType(TT_FunctionDeclarationName);
  const FormatToken *Prev = Current->Previous;
  if (Current->is(TT_LineComment)) {
    if (Prev->is(BK_BracedInit) && Prev->opensScope())
      Current->SpacesRequiredBefore =
          (Style.Cpp11BracedListStyle && !Style.SpacesInParentheses) ? 0 : 1;
    else
      Current->SpacesRequiredBefore = Style.SpacesBeforeTrailingComments;

    // If we find a trailing comment, iterate backwards to determine whether
    // it seems to relate to a specific parameter. If so, break before that
    // parameter to avoid changing the comment's meaning. E.g. don't move 'b'
    // to the previous line in:
    //   SomeFunction(a,
    //                b, // comment
    //                c);
    if (!Current->HasUnescapedNewline) {
      for (FormatToken *Parameter = Current->Previous; Parameter;
           Parameter = Parameter->Previous) {
        if (Parameter->isOneOf(tok::comment, tok::r_brace))
          break;
        if (Parameter->Previous && Parameter->Previous->is(tok::comma)) {
          if (!Parameter->Previous->is(TT_CtorInitializerComma) &&
              Parameter->HasUnescapedNewline)
            Parameter->MustBreakBefore = true;
          break;
        }
      }
    }
  } else if (Current->SpacesRequiredBefore == 0 &&
             spaceRequiredBefore(Line, *Current)) {
    Current->SpacesRequiredBefore = 1;
  }

  Current->MustBreakBefore =
      Current->MustBreakBefore || mustBreakBefore(Line, *Current);

  if (!Current->MustBreakBefore && InFunctionDecl &&
      Current->is(TT_FunctionDeclarationName))
    Current->MustBreakBefore = mustBreakForReturnType(Line);

  Current->CanBreakBefore =
      Current->MustBreakBefore || canBreakBefore(Line, *Current);
  unsigned ChildSize = 0;
  if (Prev->Children.size() == 1) {
    FormatToken &LastOfChild = *Prev->Children[0]->Last;
    ChildSize = LastOfChild.isTrailingComment() ? Style.ColumnLimit
                                                : LastOfChild.TotalLength + 1;
  }
  if (Current->MustBreakBefore || Prev->Children.size() > 1 ||
      (Prev->Children.size() == 1 &&
       Prev->Children[0]->First->MustBreakBefore) ||
      Current->IsMultiline)
    Current->TotalLength = Prev->TotalLength + Style.ColumnLimit;
  else
    Current->TotalLength = Prev->TotalLength + Current->ColumnWidth +
                           ChildSize + Current->SpacesRequiredBefore;

  if (Current->is(TT_CtorInitializerColon))
    InFunctionDecl = false;

  // FIXME: Only calculate this if CanBreakBefore is true once static
  // initializers etc. are sorted out.
  // FIXME: Move magic numbers to a better place.

  // Reduce penalty for aligning ObjC method arguments using the colon
  // alignment as this is the canonical way (still prefer fitting everything
  // into one line if possible). Trying to fit a whole expression into one
  // line should not force other line breaks (e.g. when ObjC method
  // expression is a part of other expression).
  Current->SplitPenalty = splitPenalty(Line, *Current, InFunctionDecl);
  if (Style.Language == FormatStyle::LK_ObjC &&
      Current->is(TT_SelectorName) && Current->ParameterIndex > 0) {
    if (Current->ParameterIndex == 1)
      Current->SplitPenalty += 5 * Current->BindingStrength;
  } else {
    Current->SplitPenalty += 20 * Current->BindingStrength;
  }

  Current = Current->Next;
}

calculateUnbreakableTailLengths(Line);
unsigned IndentLevel = Line.Level;
for (Current = Line.First; Current != nullptr; Current = Current->Next) {
  if (Current->Role)
    Current->Role->precomputeFormattingInfos(Current);
  if (Current->MatchingParen &&
      Current->MatchingParen->opensBlockOrBlockTypeList(Style) &&
      IndentLevel > 0) {
    --IndentLevel;
  }
  Current->IndentLevel = IndentLevel;
  if (Current->opensBlockOrBlockTypeList(Style))
    ++IndentLevel;
}

LLVM_DEBUG({ printDebugInfo(Line); })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("format-token-annotator")) { { printDebugInfo(Line); }; } } while
 (false);
2676}

2678void TokenAnnotator::calculateUnbreakableTailLengths(AnnotatedLine &Line) {
unsigned UnbreakableTailLength = 0;
FormatToken *Current = Line.Last;
while (Current) {
  Current->UnbreakableTailLength = UnbreakableTailLength;
  if (Current->CanBreakBefore ||
      Current->isOneOf(tok::comment, tok::string_literal)) {
    UnbreakableTailLength = 0;
  } else {
    UnbreakableTailLength +=
        Current->ColumnWidth + Current->SpacesRequiredBefore;
  }
  Current = Current->Previous;
}
2692}

2694void TokenAnnotator::calculateArrayInitializerColumnList(AnnotatedLine &Line) {
if (Line.First == Line.Last) {
  return;
}
auto *CurrentToken = Line.First;
CurrentToken->ArrayInitializerLineStart = true;
unsigned Depth = 0;
while (CurrentToken != nullptr && CurrentToken != Line.Last) {
  if (CurrentToken->is(tok::l_brace)) {
    CurrentToken->IsArrayInitializer = true;
    if (CurrentToken->Next != nullptr)
      CurrentToken->Next->MustBreakBefore = true;
    CurrentToken =
        calculateInitializerColumnList(Line, CurrentToken->Next, Depth + 1);
  } else {
    CurrentToken = CurrentToken->Next;
  }
}
2712}

2714FormatToken *TokenAnnotator::calculateInitializerColumnList(
  AnnotatedLine &Line, FormatToken *CurrentToken, unsigned Depth) {
while (CurrentToken != nullptr && 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)
      break;
    CurrentToken->StartsColumn = true;
    CurrentToken = CurrentToken->Previous;
  }
  CurrentToken = CurrentToken->Next;
}
return CurrentToken;
2731}

2733unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
                                    const FormatToken &Tok,
                                    bool InFunctionDecl) {
const FormatToken &Left = *Tok.Previous;
const FormatToken &Right = Tok;

if (Left.is(tok::semi))
  return 0;

if (Style.Language == FormatStyle::LK_Java) {
  if (Right.isOneOf(Keywords.kw_extends, Keywords.kw_throws))
    return 1;
  if (Right.is(Keywords.kw_implements))
    return 2;
  if (Left.is(tok::comma) && Left.NestingLevel == 0)
    return 3;
} else if (Style.isJavaScript()) {
  if (Right.is(Keywords.kw_function) && Left.isNot(tok::comma))
    return 100;
  if (Left.is(TT_JsTypeColon))
    return 35;
  if ((Left.is(TT_TemplateString) && Left.TokenText.endswith("${")) ||
      (Right.is(TT_TemplateString) && Right.TokenText.startswith("}")))
    return 100;
  // Prefer breaking call chains (".foo") over empty "{}", "[]" or "()".
  if (Left.opensScope() && Right.closesScope())
    return 200;
}

if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
  return 1;
if (Right.is(tok::l_square)) {
  if (Style.Language == FormatStyle::LK_Proto)
    return 1;
  if (Left.is(tok::r_square))
    return 200;
  // Slightly prefer formatting local lambda definitions like functions.
  if (Right.is(TT_LambdaLSquare) && Left.is(tok::equal))
    return 35;
  if (!Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare,
                     TT_ArrayInitializerLSquare,
                     TT_DesignatedInitializerLSquare, TT_AttributeSquare))
    return 500;
}

if (Left.is(tok::coloncolon) ||
    (Right.is(tok::period) && Style.Language == FormatStyle::LK_Proto))
  return 500;
if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
    Right.is(tok::kw_operator)) {
  if (Line.startsWith(tok::kw_for) && Right.PartOfMultiVariableDeclStmt)
    return 3;
  if (Left.is(TT_StartOfName))
    return 110;
  if (InFunctionDecl && Right.NestingLevel == 0)
    return Style.PenaltyReturnTypeOnItsOwnLine;
  return 200;
}
if (Right.is(TT_PointerOrReference))
  return 190;
if (Right.is(TT_LambdaArrow))
  return 110;
if (Left.is(tok::equal) && Right.is(tok::l_brace))
  return 160;
if (Left.is(TT_CastRParen))
  return 100;
if (Left.isOneOf(tok::kw_class, tok::kw_struct))
  return 5000;
if (Left.is(tok::comment))
  return 1000;

if (Left.isOneOf(TT_RangeBasedForLoopColon, TT_InheritanceColon,
                 TT_CtorInitializerColon))
  return 2;

if (Right.isMemberAccess()) {
  // Breaking before the "./->" of a chained call/member access is reasonably
  // cheap, as formatting those with one call per line is generally
  // desirable. In particular, it should be cheaper to break before the call
  // than it is to break inside a call's parameters, which could lead to weird
  // "hanging" indents. The exception is the very last "./->" to support this
  // frequent pattern:
  //
  //   aaaaaaaa.aaaaaaaa.bbbbbbb().ccccccccccccccccccccc(
  //       dddddddd);
  //
  // which might otherwise be blown up onto many lines. Here, clang-format
  // won't produce "hanging" indents anyway as there is no other trailing
  // call.
  //
  // Also apply higher penalty is not a call as that might lead to a wrapping
  // like:
  //
  //   aaaaaaa
  //       .aaaaaaaaa.bbbbbbbb(cccccccc);
  return !Right.NextOperator || !Right.NextOperator->Previous->closesScope()
             ? 150
             : 35;
}

if (Right.is(TT_TrailingAnnotation) &&
    (!Right.Next || Right.Next->isNot(tok::l_paren))) {
  // Moving trailing annotations to the next line is fine for ObjC method
  // declarations.
  if (Line.startsWith(TT_ObjCMethodSpecifier))
    return 10;
  // Generally, breaking before a trailing annotation is bad unless it is
  // function-like. It seems to be especially preferable to keep standard
  // annotations (i.e. "const", "final" and "override") on the same line.
  // Use a slightly higher penalty after ")" so that annotations like
  // "const override" are kept together.
  bool is_short_annotation = Right.TokenText.size() < 10;
  return (Left.is(tok::r_paren) ? 100 : 120) + (is_short_annotation ? 50 : 0);
}

// In for-loops, prefer breaking at ',' and ';'.
if (Line.startsWith(tok::kw_for) && Left.is(tok::equal))
  return 4;

// In Objective-C method expressions, prefer breaking before "param:" over
// breaking after it.
if (Right.is(TT_SelectorName))
  return 0;
if (Left.is(tok::colon) && Left.is(TT_ObjCMethodExpr))
  return Line.MightBeFunctionDecl ? 50 : 500;

// In Objective-C type declarations, avoid breaking after the category's
// open paren (we'll prefer breaking after the protocol list's opening
// angle bracket, if present).
if (Line.Type == LT_ObjCDecl && Left.is(tok::l_paren) && Left.Previous &&
    Left.Previous->isOneOf(tok::identifier, tok::greater))
  return 500;

if (Left.is(tok::l_paren) && Style.PenaltyBreakOpenParenthesis != 0)
  return Style.PenaltyBreakOpenParenthesis;
if (Left.is(tok::l_paren) && InFunctionDecl &&
    Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign)
  return 100;
if (Left.is(tok::l_paren) && Left.Previous &&
    (Left.Previous->is(tok::kw_for) || Left.Previous->isIf()))
  return 1000;
if (Left.is(tok::equal) && InFunctionDecl)
  return 110;
if (Right.is(tok::r_brace))
  return 1;
if (Left.is(TT_TemplateOpener))
  return 100;
if (Left.opensScope()) {
  // If we aren't aligning after opening parens/braces we can always break
  // here unless the style does not want us to place all arguments on the
  // next line.
  if (Style.AlignAfterOpenBracket == FormatStyle::BAS_DontAlign &&
      (Left.ParameterCount <= 1 || Style.AllowAllArgumentsOnNextLine))
    return 0;
  if (Left.is(tok::l_brace) && !Style.Cpp11BracedListStyle)
    return 19;
  return Left.ParameterCount > 1 ? Style.PenaltyBreakBeforeFirstCallParameter
                                 : 19;
}
if (Left.is(TT_JavaAnnotation))
  return 50;

if (Left.is(TT_UnaryOperator))
  return 60;
if (Left.isOneOf(tok::plus, tok::comma) && Left.Previous &&
    Left.Previous->isLabelString() &&
    (Left.NextOperator || Left.OperatorIndex != 0))
  return 50;
if (Right.is(tok::plus) && Left.isLabelString() &&
    (Right.NextOperator || Right.OperatorIndex != 0))
  return 25;
if (Left.is(tok::comma))
  return 1;
if (Right.is(tok::lessless) && Left.isLabelString() &&
    (Right.NextOperator || Right.OperatorIndex != 1))
  return 25;
if (Right.is(tok::lessless)) {
  // Breaking at a << is really cheap.
  if (!Left.is(tok::r_paren) || Right.OperatorIndex > 0)
    // Slightly prefer to break before the first one in log-like statements.
    return 2;
  return 1;
}
if (Left.ClosesTemplateDeclaration)
  return Style.PenaltyBreakTemplateDeclaration;
if (Left.is(TT_ConditionalExpr))
  return prec::Conditional;
prec::Level Level = Left.getPrecedence();
if (Level == prec::Unknown)
  Level = Right.getPrecedence();
if (Level == prec::Assignment)
  return Style.PenaltyBreakAssignment;
if (Level != prec::Unknown)
  return Level;

return 3;
2929}

2931bool TokenAnnotator::spaceRequiredBeforeParens(const FormatToken &Right) const {
if (Style.SpaceBeforeParens == FormatStyle::SBPO_Always)
  return true;
if (Right.is(TT_OverloadedOperatorLParen) &&
    Style.SpaceBeforeParensOptions.AfterOverloadedOperator)
  return true;
if (Style.SpaceBeforeParensOptions.BeforeNonEmptyParentheses &&
    Right.ParameterCount > 0)
  return true;
return false;
2941}

2943bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
                                        const FormatToken &Left,
                                        const FormatToken &Right) {
if (Left.is(tok::kw_return) && Right.isNot(tok::semi))
  return true;
if (Style.isJson() && Left.is(tok::string_literal) && Right.is(tok::colon))
  return false;
if (Left.is(Keywords.kw_assert) && Style.Language == FormatStyle::LK_Java)
  return true;
if (Style.ObjCSpaceAfterProperty && Line.Type == LT_ObjCProperty &&
    Left.Tok.getObjCKeywordID() == tok::objc_property)
  return true;
if (Right.is(tok::hashhash))
  return Left.is(tok::hash);
if (Left.isOneOf(tok::hashhash, tok::hash))
  return Right.is(tok::hash);
if ((Left.is(tok::l_paren) && Right.is(tok::r_paren)) ||
    (Left.is(tok::l_brace) && Left.isNot(BK_Block) &&
     Right.is(tok::r_brace) && Right.isNot(BK_Block)))
  return Style.SpaceInEmptyParentheses;
if (Style.SpacesInConditionalStatement) {
  if (Left.is(tok::l_paren) && Left.Previous &&
      isKeywordWithCondition(*Left.Previous))
    return true;
  if (Right.is(tok::r_paren) && Right.MatchingParen &&
      Right.MatchingParen->Previous &&
      isKeywordWithCondition(*Right.MatchingParen->Previous))
    return true;
}

// auto{x} auto(x)
if (Left.is(tok::kw_auto) && Right.isOneOf(tok::l_paren, tok::l_brace))
  return false;

// operator co_await(x)
if (Right.is(tok::l_paren) && Left.is(tok::kw_co_await) && Left.Previous &&
    Left.Previous->is(tok::kw_operator))
  return false;
// co_await (x), co_yield (x), co_return (x)
if (Left.isOneOf(tok::kw_co_await, tok::kw_co_yield, tok::kw_co_return) &&
    Right.isNot(tok::semi))
  return true;
// requires clause Concept1<T> && Concept2<T>
if (Left.is(TT_ConstraintJunctions) && Right.is(tok::identifier))
  return true;

if (Left.is(tok::l_paren) || Right.is(tok::r_paren))
  return (Right.is(TT_CastRParen) ||
          (Left.MatchingParen && Left.MatchingParen->is(TT_CastRParen)))
             ? Style.SpacesInCStyleCastParentheses
             : Style.SpacesInParentheses;
if (Right.isOneOf(tok::semi, tok::comma))
  return false;
if (Right.is(tok::less) && Line.Type == LT_ObjCDecl) {
  bool IsLightweightGeneric = Right.MatchingParen &&
                              Right.MatchingParen->Next &&
                              Right.MatchingParen->Next->is(tok::colon);
  return !IsLightweightGeneric && Style.ObjCSpaceBeforeProtocolList;
}
if (Right.is(tok::less) && Left.is(tok::kw_template))
  return Style.SpaceAfterTemplateKeyword;
if (Left.isOneOf(tok::exclaim, tok::tilde))
  return false;
if (Left.is(tok::at) &&
    Right.isOneOf(tok::identifier, tok::string_literal, tok::char_constant,
                  tok::numeric_constant, tok::l_paren, tok::l_brace,
                  tok::kw_true, tok::kw_false))
  return false;
if (Left.is(tok::colon))
  return !Left.is(TT_ObjCMethodExpr);
if (Left.is(tok::coloncolon))
  return false;
if (Left.is(tok::less) || Right.isOneOf(tok::greater, tok::less)) {
  if (Style.Language == FormatStyle::LK_TextProto ||
      (Style.Language == FormatStyle::LK_Proto &&
       (Left.is(TT_DictLiteral) || Right.is(TT_DictLiteral)))) {
    // Format empty list as `<>`.
    if (Left.is(tok::less) && Right.is(tok::greater))
      return false;
    return !Style.Cpp11BracedListStyle;
  }
  return false;
}
if (Right.is(tok::ellipsis))
  return Left.Tok.isLiteral() || (Left.is(tok::identifier) && Left.Previous &&
                                  Left.Previous->is(tok::kw_case));
if (Left.is(tok::l_square) && Right.is(tok::amp))
  return Style.SpacesInSquareBrackets;
if (Right.is(TT_PointerOrReference)) {
  if (Left.is(tok::r_paren) && Line.MightBeFunctionDecl) {
    if (!Left.MatchingParen)
      return true;
    FormatToken *TokenBeforeMatchingParen =
        Left.MatchingParen->getPreviousNonComment();
    if (!TokenBeforeMatchingParen || !Left.is(TT_TypeDeclarationParen))
      return true;
  }
  // Add a space if the previous token is a pointer qualifier or the closing
  // parenthesis of __attribute__(()) expression and the style requires spaces
  // after pointer qualifiers.
  if ((Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_After ||
       Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Both) &&
      (Left.is(TT_AttributeParen) || Left.canBePointerOrReferenceQualifier()))
    return true;
  if (Left.Tok.isLiteral())
    return true;
  // for (auto a = 0, b = 0; const auto & c : {1, 2, 3})
  if (Left.isTypeOrIdentifier() && Right.Next && Right.Next->Next &&
      Right.Next->Next->is(TT_RangeBasedForLoopColon))
    return getTokenPointerOrReferenceAlignment(Right) !=
           FormatStyle::PAS_Left;
  return (
      (!Left.isOneOf(TT_PointerOrReference, tok::l_paren) &&
       (getTokenPointerOrReferenceAlignment(Right) != FormatStyle::PAS_Left ||
        (Line.IsMultiVariableDeclStmt &&
         (Left.NestingLevel == 0 ||
          (Left.NestingLevel == 1 && Line.First->is(tok::kw_for)))))));
}
if (Right.is(TT_FunctionTypeLParen) && Left.isNot(tok::l_paren) &&
    (!Left.is(TT_PointerOrReference) ||
     (getTokenPointerOrReferenceAlignment(Left) != FormatStyle::PAS_Right &&
      !Line.IsMultiVariableDeclStmt)))
  return true;
if (Left.is(TT_PointerOrReference)) {
  // Add a space if the next token is a pointer qualifier and the style
  // requires spaces before pointer qualifiers.
  if ((Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Before ||
       Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Both) &&
      Right.canBePointerOrReferenceQualifier())
    return true;
  // & 1
  if (Right.Tok.isLiteral())
    return true;
  // & /* comment
  if (Right.is(TT_BlockComment))
    return true;
  // foo() -> const Bar * override/final
  if (Right.isOneOf(Keywords.kw_override, Keywords.kw_final) &&
      !Right.is(TT_StartOfName))
    return true;
  // & {
  if (Right.is(tok::l_brace) && Right.is(BK_Block))
    return true;
  // for (auto a = 0, b = 0; const auto& c : {1, 2, 3})
  if (Left.Previous && Left.Previous->isTypeOrIdentifier() && Right.Next &&
      Right.Next->is(TT_RangeBasedForLoopColon))
    return getTokenPointerOrReferenceAlignment(Left) !=
           FormatStyle::PAS_Right;
  return !Right.isOneOf(TT_PointerOrReference, TT_ArraySubscriptLSquare,
                        tok::l_paren) &&
         (getTokenPointerOrReferenceAlignment(Left) !=
              FormatStyle::PAS_Right &&
          !Line.IsMultiVariableDeclStmt) &&
         Left.Previous &&
         !Left.Previous->isOneOf(tok::l_paren, tok::coloncolon,
                                 tok::l_square);
}
// Ensure right pointer alignment with ellipsis e.g. int *...P
if (Left.is(tok::ellipsis) && Left.Previous &&
    Left.Previous->isOneOf(tok::star, tok::amp, tok::ampamp))
  return Style.PointerAlignment != FormatStyle::PAS_Right;

if (Right.is(tok::star) && Left.is(tok::l_paren))
  return false;
if (Left.is(tok::star) && Right.isOneOf(tok::star, tok::amp, tok::ampamp))
  return false;
if (Right.isOneOf(tok::star, tok::amp, tok::ampamp)) {
  const FormatToken *Previous = &Left;
  while (Previous && !Previous->is(tok::kw_operator)) {
    if (Previous->is(tok::identifier) || Previous->isSimpleTypeSpecifier()) {
      Previous = Previous->getPreviousNonComment();
      continue;
    }
    if (Previous->is(TT_TemplateCloser) && Previous->MatchingParen) {
      Previous = Previous->MatchingParen->getPreviousNonComment();
      continue;
    }
    if (Previous->is(tok::coloncolon)) {
      Previous = Previous->getPreviousNonComment();
      continue;
    }
    break;
  }
  // Space between the type and the * in:
  //   operator void*()
  //   operator char*()
  //   operator void const*()
  //   operator void volatile*()
  //   operator /*comment*/ const char*()
  //   operator volatile /*comment*/ char*()
  //   operator Foo*()
  //   operator C<T>*()
  //   operator std::Foo*()
  //   operator C<T>::D<U>*()
  // dependent on PointerAlignment style.
  if (Previous) {
    if (Previous->endsSequence(tok::kw_operator))
      return (Style.PointerAlignment != FormatStyle::PAS_Left);
    if (Previous->is(tok::kw_const) || Previous->is(tok::kw_volatile))
      return (Style.PointerAlignment != FormatStyle::PAS_Left) ||
             (Style.SpaceAroundPointerQualifiers ==
              FormatStyle::SAPQ_After) ||
             (Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Both);
  }
}
const auto SpaceRequiredForArrayInitializerLSquare =
    [](const FormatToken &LSquareTok, const FormatStyle &Style) {
      return Style.SpacesInContainerLiterals ||
             ((Style.Language == FormatStyle::LK_Proto ||
               Style.Language == FormatStyle::LK_TextProto) &&
              !Style.Cpp11BracedListStyle &&
              LSquareTok.endsSequence(tok::l_square, tok::colon,
                                      TT_SelectorName));
    };
if (Left.is(tok::l_square))
  return (Left.is(TT_ArrayInitializerLSquare) && Right.isNot(tok::r_square) &&
          SpaceRequiredForArrayInitializerLSquare(Left, Style)) ||
         (Left.isOneOf(TT_ArraySubscriptLSquare, TT_StructuredBindingLSquare,
                       TT_LambdaLSquare) &&
          Style.SpacesInSquareBrackets && Right.isNot(tok::r_square));
if (Right.is(tok::r_square))
  return Right.MatchingParen &&
         ((Right.MatchingParen->is(TT_ArrayInitializerLSquare) &&
           SpaceRequiredForArrayInitializerLSquare(*Right.MatchingParen,
                                                   Style)) ||
          (Style.SpacesInSquareBrackets &&
           Right.MatchingParen->isOneOf(TT_ArraySubscriptLSquare,
                                        TT_StructuredBindingLSquare,
                                        TT_LambdaLSquare)) ||
          Right.MatchingParen->is(TT_AttributeParen));
if (Right.is(tok::l_square) &&
    !Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare,
                   TT_DesignatedInitializerLSquare,
                   TT_StructuredBindingLSquare, TT_AttributeSquare) &&
    !Left.isOneOf(tok::numeric_constant, TT_DictLiteral) &&
    !(!Left.is(tok::r_square) && Style.SpaceBeforeSquareBrackets &&
      Right.is(TT_ArraySubscriptLSquare)))
  return false;
if (Left.is(tok::l_brace) && Right.is(tok::r_brace))
  return !Left.Children.empty(); // No spaces in "{}".
if ((Left.is(tok::l_brace) && Left.isNot(BK_Block)) ||
    (Right.is(tok::r_brace) && Right.MatchingParen &&
     Right.MatchingParen->isNot(BK_Block)))
  return Style.Cpp11BracedListStyle ? Style.SpacesInParentheses : true;
if (Left.is(TT_BlockComment))
  // No whitespace in x(/*foo=*/1), except for JavaScript.
  return Style.isJavaScript() || !Left.TokenText.endswith("=*/");

// Space between template and attribute.
// e.g. template <typename T> [[nodiscard]] ...
if (Left.is(TT_TemplateCloser) && Right.is(TT_AttributeSquare))
  return true;
// Space before parentheses common for all languages
if (Right.is(tok::l_paren)) {
  if (Left.is(TT_TemplateCloser) && Right.isNot(TT_FunctionTypeLParen))
    return spaceRequiredBeforeParens(Right);
  if (Left.is(tok::kw_requires))
    return spaceRequiredBeforeParens(Right);
  if ((Left.is(tok::r_paren) && Left.is(TT_AttributeParen)) ||
      (Left.is(tok::r_square) && Left.is(TT_AttributeSquare)))
    return true;
  if (Left.is(TT_ForEachMacro))
    return (Style.SpaceBeforeParensOptions.AfterForeachMacros ||
            spaceRequiredBeforeParens(Right));
  if (Left.is(TT_IfMacro))
    return (Style.SpaceBeforeParensOptions.AfterIfMacros ||
            spaceRequiredBeforeParens(Right));
  if (Line.Type == LT_ObjCDecl)
    return true;
  if (Left.is(tok::semi))
    return true;
  if (Left.isOneOf(tok::pp_elif, tok::kw_for, tok::kw_while, tok::kw_switch,
                   tok::kw_case, TT_ForEachMacro, TT_ObjCForIn))
    return Style.SpaceBeforeParensOptions.AfterControlStatements ||
           spaceRequiredBeforeParens(Right);
  if (Left.isIf(Line.Type != LT_PreprocessorDirective))
    return Style.SpaceBeforeParensOptions.AfterControlStatements ||
           spaceRequiredBeforeParens(Right);

  // TODO add Operator overloading specific Options to
  // SpaceBeforeParensOptions
  if (Right.is(TT_OverloadedOperatorLParen))
    return spaceRequiredBeforeParens(Right);
  // Function declaration or definition
  if (Line.MightBeFunctionDecl && (Left.is(TT_FunctionDeclarationName))) {
    if (Line.mightBeFunctionDefinition())
      return Style.SpaceBeforeParensOptions.AfterFunctionDefinitionName ||
             spaceRequiredBeforeParens(Right);
    else
      return Style.SpaceBeforeParensOptions.AfterFunctionDeclarationName ||
             spaceRequiredBeforeParens(Right);
  }
  // Lambda
  if (Line.Type != LT_PreprocessorDirective && Left.is(tok::r_square) &&
      Left.MatchingParen && Left.MatchingParen->is(TT_LambdaLSquare))
    return Style.SpaceBeforeParensOptions.AfterFunctionDefinitionName ||
           spaceRequiredBeforeParens(Right);
  if (!Left.Previous || Left.Previous->isNot(tok::period)) {
    if (Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch))
      return Style.SpaceBeforeParensOptions.AfterControlStatements ||
             spaceRequiredBeforeParens(Right);
    if (Left.isOneOf(tok::kw_new, tok::kw_delete))
      return Style.SpaceBeforeParens != FormatStyle::SBPO_Never ||
             spaceRequiredBeforeParens(Right);
  }
  if (Line.Type != LT_PreprocessorDirective &&
      (Left.is(tok::identifier) || Left.isFunctionLikeKeyword() ||
       Left.is(tok::r_paren) || Left.isSimpleTypeSpecifier()))
    return spaceRequiredBeforeParens(Right);
  return false;
}
if (Left.is(tok::at) && Right.Tok.getObjCKeywordID() != tok::objc_not_keyword)
  return false;
if (Right.is(TT_UnaryOperator))
  return !Left.isOneOf(tok::l_paren, tok::l_square, tok::at) &&
         (Left.isNot(tok::colon) || Left.isNot(TT_ObjCMethodExpr));
if ((Left.isOneOf(tok::identifier, tok::greater, tok::r_square,
                  tok::r_paren) ||
     Left.isSimpleTypeSpecifier()) &&
    Right.is(tok::l_brace) && Right.getNextNonComment() &&
    Right.isNot(BK_Block))
  return false;
if (Left.is(tok::period) || Right.is(tok::period))
  return false;
// u#str, U#str, L#str, u8#str
// uR#str, UR#str, LR#str, u8R#str
if (Right.is(tok::hash) && Left.is(tok::identifier) &&
    (Left.TokenText == "L" || Left.TokenText == "u" ||
     Left.TokenText == "U" || Left.TokenText == "u8" ||
     Left.TokenText == "LR" || Left.TokenText == "uR" ||
     Left.TokenText == "UR" || Left.TokenText == "u8R"))
  return false;
if (Left.is(TT_TemplateCloser) && Left.MatchingParen &&
    Left.MatchingParen->Previous &&
    (Left.MatchingParen->Previous->is(tok::period) ||
     Left.MatchingParen->Previous->is(tok::coloncolon)))
  // Java call to generic function with explicit type:
  // A.<B<C<...>>>DoSomething();
  // A::<B<C<...>>>DoSomething();  // With a Java 8 method reference.
  return false;
if (Left.is(TT_TemplateCloser) && Right.is(tok::l_square))
  return false;
if (Left.is(tok::l_brace) && Left.endsSequence(TT_DictLiteral, tok::at))
  // Objective-C dictionary literal -> no space after opening brace.
  return false;
if (Right.is(tok::r_brace) && Right.MatchingParen &&
    Right.MatchingParen->endsSequence(TT_DictLiteral, tok::at))
  // Objective-C dictionary literal -> no space before closing brace.
  return false;
if (Right.getType() == TT_TrailingAnnotation &&
    Right.isOneOf(tok::amp, tok::ampamp) &&
    Left.isOneOf(tok::kw_const, tok::kw_volatile) &&
    (!Right.Next || Right.Next->is(tok::semi)))
  // Match const and volatile ref-qualifiers without any additional
  // qualifiers such as
  // void Fn() const &;
  return getTokenReferenceAlignment(Right) != FormatStyle::PAS_Left;

return true;
3302}

3304bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
                                       const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
auto HasExistingWhitespace = [&Right]() {
  return Right.WhitespaceRange.getBegin() != Right.WhitespaceRange.getEnd();
};

// If the token is finalized don't touch it (as it could be in a
// clang-format-off section).
if (Left.Finalized)
  return HasExistingWhitespace();

if (Right.Tok.getIdentifierInfo() && Left.Tok.getIdentifierInfo())
  return true; // Never ever merge two identifiers.

// Leave a space between * and /* to avoid C4138 `comment end` found outside
// of comment.
if (Left.is(tok::star) && Right.is(tok::comment))
  return true;

if (Style.isCpp()) {
  // Space between import <iostream>.
  // or import .....;
  if (Left.is(Keywords.kw_import) && Right.isOneOf(tok::less, tok::ellipsis))
    return true;
  // No space between module :.
  if (Left.isOneOf(Keywords.kw_module, Keywords.kw_import) &&
      Right.is(TT_ModulePartitionColon))
    return true;
  // No space between import foo:bar but keep a space between import :bar;
  if (Left.is(tok::identifier) && Right.is(TT_ModulePartitionColon))
    return false;
  // No space between :bar;
  if (Left.is(TT_ModulePartitionColon) &&
      Right.isOneOf(tok::identifier, tok::kw_private))
    return false;
  if (Left.is(tok::ellipsis) && Right.is(tok::identifier) &&
      Line.First->is(Keywords.kw_import))
    return false;

  if (Left.is(tok::kw_operator))
    return Right.is(tok::coloncolon);
  if (Right.is(tok::l_brace) && Right.is(BK_BracedInit) &&
      !Left.opensScope() && Style.SpaceBeforeCpp11BracedList)
    return true;
} else if (Style.Language == FormatStyle::LK_Proto ||
           Style.Language == FormatStyle::LK_TextProto) {
  if (Right.is(tok::period) &&
      Left.isOneOf(Keywords.kw_optional, Keywords.kw_required,
                   Keywords.kw_repeated, Keywords.kw_extend))
    return true;
  if (Right.is(tok::l_paren) &&
      Left.isOneOf(Keywords.kw_returns, Keywords.kw_option))
    return true;
  if (Right.isOneOf(tok::l_brace, tok::less) && Left.is(TT_SelectorName))
    return true;
  // Slashes occur in text protocol extension syntax: [type/type] { ... }.
  if (Left.is(tok::slash) || Right.is(tok::slash))
    return false;
  if (Left.MatchingParen &&
      Left.MatchingParen->is(TT_ProtoExtensionLSquare) &&
      Right.isOneOf(tok::l_brace, tok::less))
    return !Style.Cpp11BracedListStyle;
  // A percent is probably part of a formatting specification, such as %lld.
  if (Left.is(tok::percent))
    return false;
  // Preserve the existence of a space before a percent for cases like 0x%04x
  // and "%d %d"
  if (Left.is(tok::numeric_constant) && Right.is(tok::percent))
    return HasExistingWhitespace();
} else if (Style.isJson()) {
  if (Right.is(tok::colon))
    return false;
} else if (Style.isCSharp()) {
  // Require spaces around '{' and  before '}' unless they appear in
  // interpolated strings. Interpolated strings are merged into a single token
  // so cannot have spaces inserted by this function.

  // No space between 'this' and '['
  if (Left.is(tok::kw_this) && Right.is(tok::l_square))
    return false;

  // No space between 'new' and '('
  if (Left.is(tok::kw_new) && Right.is(tok::l_paren))
    return false;

  // Space before { (including space within '{ {').
  if (Right.is(tok::l_brace))
    return true;

  // Spaces inside braces.
  if (Left.is(tok::l_brace) && Right.isNot(tok::r_brace))
    return true;

  if (Left.isNot(tok::l_brace) && Right.is(tok::r_brace))
    return true;

  // Spaces around '=>'.
  if (Left.is(TT_FatArrow) || Right.is(TT_FatArrow))
    return true;

  // No spaces around attribute target colons
  if (Left.is(TT_AttributeColon) || Right.is(TT_AttributeColon))
    return false;

  // space between type and variable e.g. Dictionary<string,string> foo;
  if (Left.is(TT_TemplateCloser) && Right.is(TT_StartOfName))
    return true;

  // spaces inside square brackets.
  if (Left.is(tok::l_square) || Right.is(tok::r_square))
    return Style.SpacesInSquareBrackets;

  // No space before ? in nullable types.
  if (Right.is(TT_CSharpNullable))
    return false;

  // No space before null forgiving '!'.
  if (Right.is(TT_NonNullAssertion))
    return false;

  // No space between consecutive commas '[,,]'.
  if (Left.is(tok::comma) && Right.is(tok::comma))
    return false;

  // space after var in `var (key, value)`
  if (Left.is(Keywords.kw_var) && Right.is(tok::l_paren))
    return true;

  // space between keywords and paren e.g. "using ("
  if (Right.is(tok::l_paren))
    if (Left.isOneOf(tok::kw_using, Keywords.kw_async, Keywords.kw_when,
                     Keywords.kw_lock))
      return Style.SpaceBeforeParensOptions.AfterControlStatements ||
             spaceRequiredBeforeParens(Right);

  // space between method modifier and opening parenthesis of a tuple return
  // type
  if (Left.isOneOf(tok::kw_public, tok::kw_private, tok::kw_protected,
                   tok::kw_virtual, tok::kw_extern, tok::kw_static,
                   Keywords.kw_internal, Keywords.kw_abstract,
                   Keywords.kw_sealed, Keywords.kw_override,
                   Keywords.kw_async, Keywords.kw_unsafe) &&
      Right.is(tok::l_paren))
    return true;
} else if (Style.isJavaScript()) {
  if (Left.is(TT_FatArrow))
    return true;
  // for await ( ...
  if (Right.is(tok::l_paren) && Left.is(Keywords.kw_await) && Left.Previous &&
      Left.Previous->is(tok::kw_for))
    return true;
  if (Left.is(Keywords.kw_async) && Right.is(tok::l_paren) &&
      Right.MatchingParen) {
    const FormatToken *Next = Right.MatchingParen->getNextNonComment();
    // An async arrow function, for example: `x = async () => foo();`,
    // as opposed to calling a function called async: `x = async();`
    if (Next && Next->is(TT_FatArrow))
      return true;
  }
  if ((Left.is(TT_TemplateString) && Left.TokenText.endswith("${")) ||
      (Right.is(TT_TemplateString) && Right.TokenText.startswith("}")))
    return false;
  // In tagged template literals ("html`bar baz`"), there is no space between
  // the tag identifier and the template string.
  if (Keywords.IsJavaScriptIdentifier(Left,
                                      /* AcceptIdentifierName= */ false) &&
      Right.is(TT_TemplateString))
    return false;
  if (Right.is(tok::star) &&
      Left.isOneOf(Keywords.kw_function, Keywords.kw_yield))
    return false;
  if (Right.isOneOf(tok::l_brace, tok::l_square) &&
      Left.isOneOf(Keywords.kw_function, Keywords.kw_yield,
                   Keywords.kw_extends, Keywords.kw_implements))
    return true;
  if (Right.is(tok::l_paren)) {
    // JS methods can use some keywords as names (e.g. `delete()`).
    if (Line.MustBeDeclaration && Left.Tok.getIdentifierInfo())
      return false;
    // Valid JS method names can include keywords, e.g. `foo.delete()` or
    // `bar.instanceof()`. Recognize call positions by preceding period.
    if (Left.Previous && Left.Previous->is(tok::period) &&
        Left.Tok.getIdentifierInfo())
      return false;
    // Additional unary JavaScript operators that need a space after.
    if (Left.isOneOf(tok::kw_throw, Keywords.kw_await, Keywords.kw_typeof,
                     tok::kw_void))
      return true;
  }
  // `foo as const;` casts into a const type.
  if (Left.endsSequence(tok::kw_const, Keywords.kw_as)) {
    return false;
  }
  if ((Left.isOneOf(Keywords.kw_let, Keywords.kw_var, Keywords.kw_in,
                    tok::kw_const) ||
       // "of" is only a keyword if it appears after another identifier
       // (e.g. as "const x of y" in a for loop), or after a destructuring
       // operation (const [x, y] of z, const {a, b} of c).
       (Left.is(Keywords.kw_of) && Left.Previous &&
        (Left.Previous->Tok.is(tok::identifier) ||
         Left.Previous->isOneOf(tok::r_square, tok::r_brace)))) &&
      (!Left.Previous || !Left.Previous->is(tok::period)))
    return true;
  if (Left.isOneOf(tok::kw_for, Keywords.kw_as) && Left.Previous &&
      Left.Previous->is(tok::period) && Right.is(tok::l_paren))
    return false;
  if (Left.is(Keywords.kw_as) &&
      Right.isOneOf(tok::l_square, tok::l_brace, tok::l_paren))
    return true;
  if (Left.is(tok::kw_default) && Left.Previous &&
      Left.Previous->is(tok::kw_export))
    return true;
  if (Left.is(Keywords.kw_is) && Right.is(tok::l_brace))
    return true;
  if (Right.isOneOf(TT_JsTypeColon, TT_JsTypeOptionalQuestion))
    return false;
  if (Left.is(TT_JsTypeOperator) || Right.is(TT_JsTypeOperator))
    return false;
  if ((Left.is(tok::l_brace) || Right.is(tok::r_brace)) &&
      Line.First->isOneOf(Keywords.kw_import, tok::kw_export))
    return false;
  if (Left.is(tok::ellipsis))
    return false;
  if (Left.is(TT_TemplateCloser) &&
      !Right.isOneOf(tok::equal, tok::l_brace, tok::comma, tok::l_square,
                     Keywords.kw_implements, Keywords.kw_extends))
    // Type assertions ('<type>expr') are not followed by whitespace. Other
    // locations that should have whitespace following are identified by the
    // above set of follower tokens.
    return false;
  if (Right.is(TT_NonNullAssertion))
    return false;
  if (Left.is(TT_NonNullAssertion) &&
      Right.isOneOf(Keywords.kw_as, Keywords.kw_in))
    return true; // "x! as string", "x! in y"
} else if (Style.Language == FormatStyle::LK_Java) {
  if (Left.is(tok::r_square) && Right.is(tok::l_brace))
    return true;
  if (Left.is(Keywords.kw_synchronized) && Right.is(tok::l_paren))
    return Style.SpaceBeforeParensOptions.AfterControlStatements ||
           spaceRequiredBeforeParens(Right);
  if ((Left.isOneOf(tok::kw_static, tok::kw_public, tok::kw_private,
                    tok::kw_protected) ||
       Left.isOneOf(Keywords.kw_final, Keywords.kw_abstract,
                    Keywords.kw_native)) &&
      Right.is(TT_TemplateOpener))
    return true;
}
if (Left.is(TT_ImplicitStringLiteral))
  return HasExistingWhitespace();
if (Line.Type == LT_ObjCMethodDecl) {
  if (Left.is(TT_ObjCMethodSpecifier))
    return true;
  if (Left.is(tok::r_paren) && canBeObjCSelectorComponent(Right))
    // Don't space between ')' and <id> or ')' and 'new'. 'new' is not a
    // keyword in Objective-C, and '+ (instancetype)new;' is a standard class
    // method declaration.
    return false;
}
if (Line.Type == LT_ObjCProperty &&
    (Right.is(tok::equal) || Left.is(tok::equal)))
  return false;

if (Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow) ||
    Left.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow))
  return true;
if (Left.is(tok::comma) && !Right.is(TT_OverloadedOperatorLParen))
  return true;
if (Right.is(tok::comma))
  return false;
if (Right.is(TT_ObjCBlockLParen))
  return true;
if (Right.is(TT_CtorInitializerColon))
  return Style.SpaceBeforeCtorInitializerColon;
if (Right.is(TT_InheritanceColon) && !Style.SpaceBeforeInheritanceColon)
  return false;
if (Right.is(TT_RangeBasedForLoopColon) &&
    !Style.SpaceBeforeRangeBasedForLoopColon)
  return false;
if (Left.is(TT_BitFieldColon))
  return Style.BitFieldColonSpacing == FormatStyle::BFCS_Both ||
         Style.BitFieldColonSpacing == FormatStyle::BFCS_After;
if (Right.is(tok::colon)) {
  if (Line.First->isOneOf(tok::kw_default, tok::kw_case))
    return Style.SpaceBeforeCaseColon;
  if (!Right.getNextNonComment() || Right.getNextNonComment()->is(tok::semi))
    return false;
  if (Right.is(TT_ObjCMethodExpr))
    return false;
  if (Left.is(tok::question))
    return false;
  if (Right.is(TT_InlineASMColon) && Left.is(tok::coloncolon))
    return false;
  if (Right.is(TT_DictLiteral))
    return Style.SpacesInContainerLiterals;
  if (Right.is(TT_AttributeColon))
    return false;
  if (Right.is(TT_CSharpNamedArgumentColon))
    return false;
  if (Right.is(TT_BitFieldColon))
    return Style.BitFieldColonSpacing == FormatStyle::BFCS_Both ||
           Style.BitFieldColonSpacing == FormatStyle::BFCS_Before;
  return true;
}
// Do not merge "- -" into "--".
if ((Left.isOneOf(tok::minus, tok::minusminus) &&
     Right.isOneOf(tok::minus, tok::minusminus)) ||
    (Left.isOneOf(tok::plus, tok::plusplus) &&
     Right.isOneOf(tok::plus, tok::plusplus)))
  return true;
if (Left.is(TT_UnaryOperator)) {
  if (!Right.is(tok::l_paren)) {
    // The alternative operators for ~ and ! are "compl" and "not".
    // If they are used instead, we do not want to combine them with
    // the token to the right, unless that is a left paren.
    if (Left.is(tok::exclaim) && Left.TokenText == "not")
      return true;
    if (Left.is(tok::tilde) && Left.TokenText == "compl")
      return true;
    // Lambda captures allow for a lone &, so "&]" needs to be properly
    // handled.
    if (Left.is(tok::amp) && Right.is(tok::r_square))
      return Style.SpacesInSquareBrackets;
  }
  return (Style.SpaceAfterLogicalNot && Left.is(tok::exclaim)) ||
         Right.is(TT_BinaryOperator);
}

// If the next token is a binary operator or a selector name, we have
// incorrectly classified the parenthesis as a cast. FIXME: Detect correctly.
if (Left.is(TT_CastRParen))
  return Style.SpaceAfterCStyleCast ||
         Right.isOneOf(TT_BinaryOperator, TT_SelectorName);

auto ShouldAddSpacesInAngles = [this, &HasExistingWhitespace]() {
  if (this->Style.SpacesInAngles == FormatStyle::SIAS_Always)
    return true;
  if (this->Style.SpacesInAngles == FormatStyle::SIAS_Leave)
    return HasExistingWhitespace();
  return false;
};

if (Left.is(tok::greater) && Right.is(tok::greater)) {
  if (Style.Language == FormatStyle::LK_TextProto ||
      (Style.Language == FormatStyle::LK_Proto && Left.is(TT_DictLiteral)))
    return !Style.Cpp11BracedListStyle;
  return Right.is(TT_TemplateCloser) && Left.is(TT_TemplateCloser) &&
         ((Style.Standard < FormatStyle::LS_Cpp11) ||
          ShouldAddSpacesInAngles());
}
if (Right.isOneOf(tok::arrow, tok::arrowstar, tok::periodstar) ||
    Left.isOneOf(tok::arrow, tok::period, tok::arrowstar, tok::periodstar) ||
    (Right.is(tok::period) && Right.isNot(TT_DesignatedInitializerPeriod)))
  return false;
if (!Style.SpaceBeforeAssignmentOperators && Left.isNot(TT_TemplateCloser) &&
    Right.getPrecedence() == prec::Assignment)
  return false;
if (Style.Language == FormatStyle::LK_Java && Right.is(tok::coloncolon) &&
    (Left.is(tok::identifier) || Left.is(tok::kw_this)))
  return false;
if (Right.is(tok::coloncolon) && Left.is(tok::identifier))
  // Generally don't remove existing spaces between an identifier and "::".
  // The identifier might actually be a macro name such as ALWAYS_INLINE. If
  // this turns out to be too lenient, add analysis of the identifier itself.
  return HasExistingWhitespace();
if (Right.is(tok::coloncolon) &&
    !Left.isOneOf(tok::l_brace, tok::comment, tok::l_paren))
  // Put a space between < and :: in vector< ::std::string >
  return (Left.is(TT_TemplateOpener) &&
          ((Style.Standard < FormatStyle::LS_Cpp11) ||
           ShouldAddSpacesInAngles())) ||
         !(Left.isOneOf(tok::l_paren, tok::r_paren, tok::l_square,
                        tok::kw___super, TT_TemplateOpener,
                        TT_TemplateCloser)) ||
         (Left.is(tok::l_paren) && Style.SpacesInParentheses);
if ((Left.is(TT_TemplateOpener)) != (Right.is(TT_TemplateCloser)))
  return ShouldAddSpacesInAngles();
// Space before TT_StructuredBindingLSquare.
if (Right.is(TT_StructuredBindingLSquare))
  return !Left.isOneOf(tok::amp, tok::ampamp) ||
         getTokenReferenceAlignment(Left) != FormatStyle::PAS_Right;
// Space before & or && following a TT_StructuredBindingLSquare.
if (Right.Next && Right.Next->is(TT_StructuredBindingLSquare) &&
    Right.isOneOf(tok::amp, tok::ampamp))
  return getTokenReferenceAlignment(Right) != FormatStyle::PAS_Left;
if ((Right.is(TT_BinaryOperator) && !Left.is(tok::l_paren)) ||
    (Left.isOneOf(TT_BinaryOperator, TT_ConditionalExpr) &&
     !Right.is(tok::r_paren)))
  return true;
if (Right.is(TT_TemplateOpener) && Left.is(tok::r_paren) &&
    Left.MatchingParen && Left.MatchingParen->is(TT_OverloadedOperatorLParen))
  return false;
if (Right.is(tok::less) && Left.isNot(tok::l_paren) &&
    Line.startsWith(tok::hash))
  return true;
if (Right.is(TT_TrailingUnaryOperator))
  return false;
if (Left.is(TT_RegexLiteral))
  return false;
return spaceRequiredBetween(Line, Left, Right);
3705}

3707// Returns 'true' if 'Tok' is a brace we'd want to break before in Allman style.
3708static bool isAllmanBrace(const FormatToken &Tok) {
return Tok.is(tok::l_brace) && Tok.is(BK_Block) &&
       !Tok.isOneOf(TT_ObjCBlockLBrace, TT_LambdaLBrace, TT_DictLiteral);
3711}

3713// Returns 'true' if 'Tok' is a function argument.
3714static bool IsFunctionArgument(const FormatToken &Tok) {
return Tok.MatchingParen && Tok.MatchingParen->Next &&
       Tok.MatchingParen->Next->isOneOf(tok::comma, tok::r_paren);
3717}

3719static bool
3720isItAnEmptyLambdaAllowed(const FormatToken &Tok,
                       FormatStyle::ShortLambdaStyle ShortLambdaOption) {
return Tok.Children.empty() && ShortLambdaOption != FormatStyle::SLS_None;
3723}

3725static bool isAllmanLambdaBrace(const FormatToken &Tok) {
return (Tok.is(tok::l_brace) && Tok.is(BK_Block) &&
        !Tok.isOneOf(TT_ObjCBlockLBrace, TT_DictLiteral));
3728}

3730// Returns the first token on the line that is not a comment.
3731static const FormatToken *getFirstNonComment(const AnnotatedLine &Line) {
const FormatToken *Next = Line.First;
if (!Next)
  return Next;
if (Next->is(tok::comment))
  Next = Next->getNextNonComment();
return Next;
3738}

3740bool TokenAnnotator::mustBreakBefore(const AnnotatedLine &Line,
                                   const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
if (Right.NewlinesBefore > 1 && Style.MaxEmptyLinesToKeep > 0)
  return true;

if (Style.isCSharp()) {
  if (Left.is(TT_FatArrow) && Right.is(tok::l_brace) &&
      Style.BraceWrapping.AfterFunction)
    return true;
  if (Right.is(TT_CSharpNamedArgumentColon) ||
      Left.is(TT_CSharpNamedArgumentColon))
    return false;
  if (Right.is(TT_CSharpGenericTypeConstraint))
    return true;
  if (Right.Next && Right.Next->is(TT_FatArrow) &&
      (Right.is(tok::numeric_constant) ||
       (Right.is(tok::identifier) && Right.TokenText == "_")))
    return true;

  // Break after C# [...] and before public/protected/private/internal.
  if (Left.is(TT_AttributeSquare) && Left.is(tok::r_square) &&
      (Right.isAccessSpecifier(/*ColonRequired=*/false) ||
       Right.is(Keywords.kw_internal)))
    return true;
  // Break between ] and [ but only when there are really 2 attributes.
  if (Left.is(TT_AttributeSquare) && Right.is(TT_AttributeSquare) &&
      Left.is(tok::r_square) && Right.is(tok::l_square))
    return true;

} else if (Style.isJavaScript()) {
  // FIXME: This might apply to other languages and token kinds.
  if (Right.is(tok::string_literal) && Left.is(tok::plus) && Left.Previous &&
      Left.Previous->is(tok::string_literal))
    return true;
  if (Left.is(TT_DictLiteral) && Left.is(tok::l_brace) && Line.Level == 0 &&
      Left.Previous && Left.Previous->is(tok::equal) &&
      Line.First->isOneOf(tok::identifier, Keywords.kw_import, tok::kw_export,
                          tok::kw_const) &&
      // kw_var/kw_let are pseudo-tokens that are tok::identifier, so match
      // above.
      !Line.First->isOneOf(Keywords.kw_var, Keywords.kw_let))
    // Object literals on the top level of a file are treated as "enum-style".
    // Each key/value pair is put on a separate line, instead of bin-packing.
    return true;
  if (Left.is(tok::l_brace) && Line.Level == 0 &&
      (Line.startsWith(tok::kw_enum) ||
       Line.startsWith(tok::kw_const, tok::kw_enum) ||
       Line.startsWith(tok::kw_export, tok::kw_enum) ||
       Line.startsWith(tok::kw_export, tok::kw_const, tok::kw_enum)))
    // JavaScript top-level enum key/value pairs are put on separate lines
    // instead of bin-packing.
    return true;
  if (Right.is(tok::r_brace) && Left.is(tok::l_brace) && Left.Previous &&
      Left.Previous->is(TT_FatArrow)) {
    // JS arrow function (=> {...}).
    switch (Style.AllowShortLambdasOnASingleLine) {
    case FormatStyle::SLS_All:
      return false;
    case FormatStyle::SLS_None:
      return true;
    case FormatStyle::SLS_Empty:
      return !Left.Children.empty();
    case FormatStyle::SLS_Inline:
      // allow one-lining inline (e.g. in function call args) and empty arrow
      // functions.
      return (Left.NestingLevel == 0 && Line.Level == 0) &&
             !Left.Children.empty();
    }
    llvm_unreachable("Unknown FormatStyle::ShortLambdaStyle enum")::llvm::llvm_unreachable_internal("Unknown FormatStyle::ShortLambdaStyle enum"
, "clang/lib/Format/TokenAnnotator.cpp", 3809);
  }

  if (Right.is(tok::r_brace) && Left.is(tok::l_brace) &&
      !Left.Children.empty())
    // Support AllowShortFunctionsOnASingleLine for JavaScript.
    return Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_None ||
           Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_Empty ||
           (Left.NestingLevel == 0 && Line.Level == 0 &&
            Style.AllowShortFunctionsOnASingleLine &
                FormatStyle::SFS_InlineOnly);
} else if (Style.Language == FormatStyle::LK_Java) {
  if (Right.is(tok::plus) && Left.is(tok::string_literal) && Right.Next &&
      Right.Next->is(tok::string_literal))
    return true;
} else if (Style.Language == FormatStyle::LK_Cpp ||
           Style.Language == FormatStyle::LK_ObjC ||
           Style.Language == FormatStyle::LK_Proto ||
           Style.Language == FormatStyle::LK_TableGen ||
           Style.Language == FormatStyle::LK_TextProto) {
  if (Left.isStringLiteral() && Right.isStringLiteral())
    return true;
}

// Basic JSON newline processing.
if (Style.isJson()) {
  // Always break after a JSON record opener.
  // {
  // }
  if (Left.is(TT_DictLiteral) && Left.is(tok::l_brace))
    return true;
  // Always break after a JSON array opener.
  // [
  // ]
  if (Left.is(TT_ArrayInitializerLSquare) && Left.is(tok::l_square) &&
      !Right.is(tok::r_square))
    return true;
  // Always break after successive entries.
  // 1,
  // 2
  if (Left.is(tok::comma))
    return true;
}

// If the last token before a '}', ']', or ')' is a comma or a trailing
// comment, the intention is to insert a line break after it in order to make
// shuffling around entries easier. Import statements, especially in
// JavaScript, can be an exception to this rule.
if (Style.JavaScriptWrapImports || Line.Type != LT_ImportStatement) {
  const FormatToken *BeforeClosingBrace = nullptr;
  if ((Left.isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) ||
       (Style.isJavaScript() && Left.is(tok::l_paren))) &&
      Left.isNot(BK_Block) && Left.MatchingParen)
    BeforeClosingBrace = Left.MatchingParen->Previous;
  else if (Right.MatchingParen &&
           (Right.MatchingParen->isOneOf(tok::l_brace,
                                         TT_ArrayInitializerLSquare) ||
            (Style.isJavaScript() && Right.MatchingParen->is(tok::l_paren))))
    BeforeClosingBrace = &Left;
  if (BeforeClosingBrace && (BeforeClosingBrace->is(tok::comma) ||
                             BeforeClosingBrace->isTrailingComment()))
    return true;
}

if (Right.is(tok::comment))
  return Left.isNot(BK_BracedInit) && Left.isNot(TT_CtorInitializerColon) &&
         (Right.NewlinesBefore > 0 && Right.HasUnescapedNewline);
if (Left.isTrailingComment())
  return true;
if (Left.IsUnterminatedLiteral)
  return true;
if (Right.is(tok::lessless) && Right.Next && Left.is(tok::string_literal) &&
    Right.Next->is(tok::string_literal))
  return true;
// Can break after template<> declaration
if (Left.ClosesTemplateDeclaration && Left.MatchingParen &&
    Left.MatchingParen->NestingLevel == 0) {
  // Put concepts on the next line e.g.
  // template<typename T>
  // concept ...
  if (Right.is(tok::kw_concept))
    return Style.BreakBeforeConceptDeclarations;
  return (Style.AlwaysBreakTemplateDeclarations == FormatStyle::BTDS_Yes);
}
if (Style.PackConstructorInitializers == FormatStyle::PCIS_Never) {
  if (Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeColon &&
      (Left.is(TT_CtorInitializerComma) || Right.is(TT_CtorInitializerColon)))
    return true;

  if (Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon &&
      Left.isOneOf(TT_CtorInitializerColon, TT_CtorInitializerComma))
    return true;
}
if (Style.PackConstructorInitializers < FormatStyle::PCIS_CurrentLine &&
    Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma &&
    Right.isOneOf(TT_CtorInitializerComma, TT_CtorInitializerColon))
  return true;
// Break only if we have multiple inheritance.
if (Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma &&
    Right.is(TT_InheritanceComma))
  return true;
if (Style.BreakInheritanceList == FormatStyle::BILS_AfterComma &&
    Left.is(TT_InheritanceComma))
  return true;
if (Right.is(tok::string_literal) && Right.TokenText.startswith("R\""))
  // Multiline raw string literals are special wrt. line breaks. The author
  // has made a deliberate choice and might have aligned the contents of the
  // string literal accordingly. Thus, we try keep existing line breaks.
  return Right.IsMultiline && Right.NewlinesBefore > 0;
if ((Left.is(tok::l_brace) || (Left.is(tok::less) && Left.Previous &&
                               Left.Previous->is(tok::equal))) &&
    Right.NestingLevel == 1 && Style.Language == FormatStyle::LK_Proto) {
  // Don't put enums or option definitions onto single lines in protocol
  // buffers.
  return true;
}
if (Right.is(TT_InlineASMBrace))
  return Right.HasUnescapedNewline;

if (isAllmanBrace(Left) || isAllmanBrace(Right)) {
  auto FirstNonComment = getFirstNonComment(Line);
  bool AccessSpecifier =
      FirstNonComment &&
      FirstNonComment->isOneOf(Keywords.kw_internal, tok::kw_public,
                               tok::kw_private, tok::kw_protected);

  if (Style.BraceWrapping.AfterEnum) {
    if (Line.startsWith(tok::kw_enum) ||
        Line.startsWith(tok::kw_typedef, tok::kw_enum))
      return true;
    // Ensure BraceWrapping for `public enum A {`.
    if (AccessSpecifier && FirstNonComment->Next &&
        FirstNonComment->Next->is(tok::kw_enum))
      return true;
  }

  // Ensure BraceWrapping for `public interface A {`.
  if (Style.BraceWrapping.AfterClass &&
      ((AccessSpecifier && FirstNonComment->Next &&
        FirstNonComment->Next->is(Keywords.kw_interface)) ||
       Line.startsWith(Keywords.kw_interface)))
    return true;

  return (Line.startsWith(tok::kw_class) && Style.BraceWrapping.AfterClass) ||
         (Line.startsWith(tok::kw_struct) && Style.BraceWrapping.AfterStruct);
}

if (Left.is(TT_ObjCBlockLBrace) &&
    Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Never)
  return true;

// Ensure wrapping after __attribute__((XX)) and @interface etc.
if (Left.is(TT_AttributeParen) && Right.is(TT_ObjCDecl))
  return true;

if (Left.is(TT_LambdaLBrace)) {
  if (IsFunctionArgument(Left) &&
      Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_Inline)
    return false;

  if (Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_None ||
      Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_Inline ||
      (!Left.Children.empty() &&
       Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_Empty))
    return true;
}

if (Style.BraceWrapping.BeforeLambdaBody && Right.is(TT_LambdaLBrace) &&
    Left.isOneOf(tok::star, tok::amp, tok::ampamp, TT_TemplateCloser)) {
  return true;
}

// Put multiple Java annotation on a new line.
if ((Style.Language == FormatStyle::LK_Java || Style.isJavaScript()) &&
    Left.is(TT_LeadingJavaAnnotation) &&
    Right.isNot(TT_LeadingJavaAnnotation) && Right.isNot(tok::l_paren) &&
    (Line.Last->is(tok::l_brace) || Style.BreakAfterJavaFieldAnnotations))
  return true;

if (Right.is(TT_ProtoExtensionLSquare))
  return true;

// In text proto instances if a submessage contains at least 2 entries and at
// least one of them is a submessage, like A { ... B { ... } ... },
// put all of the entries of A on separate lines by forcing the selector of
// the submessage B to be put on a newline.
//
// Example: these can stay on one line:
// a { scalar_1: 1 scalar_2: 2 }
// a { b { key: value } }
//
// and these entries need to be on a new line even if putting them all in one
// line is under the column limit:
// a {
//   scalar: 1
//   b { key: value }
// }
//
// We enforce this by breaking before a submessage field that has previous
// siblings, *and* breaking before a field that follows a submessage field.
//
// Be careful to exclude the case  [proto.ext] { ... } since the `]` is
// the TT_SelectorName there, but we don't want to break inside the brackets.
//
// Another edge case is @submessage { key: value }, which is a common
// substitution placeholder. In this case we want to keep `@` and `submessage`
// together.
//
// We ensure elsewhere that extensions are always on their own line.
if ((Style.Language == FormatStyle::LK_Proto ||
     Style.Language == FormatStyle::LK_TextProto) &&
    Right.is(TT_SelectorName) && !Right.is(tok::r_square) && Right.Next) {
  // Keep `@submessage` together in:
  // @submessage { key: value }
  if (Left.is(tok::at))
    return false;
  // Look for the scope opener after selector in cases like:
  // selector { ...
  // selector: { ...
  // selector: @base { ...
  FormatToken *LBrace = Right.Next;
  if (LBrace && LBrace->is(tok::colon)) {
    LBrace = LBrace->Next;
    if (LBrace && LBrace->is(tok::at)) {
      LBrace = LBrace->Next;
      if (LBrace)
        LBrace = LBrace->Next;
    }
  }
  if (LBrace &&
      // The scope opener is one of {, [, <:
      // selector { ... }
      // selector [ ... ]
      // selector < ... >
      //
      // In case of selector { ... }, the l_brace is TT_DictLiteral.
      // In case of an empty selector {}, the l_brace is not TT_DictLiteral,
      // so we check for immediately following r_brace.
      ((LBrace->is(tok::l_brace) &&
        (LBrace->is(TT_DictLiteral) ||
         (LBrace->Next && LBrace->Next->is(tok::r_brace)))) ||
       LBrace->is(TT_ArrayInitializerLSquare) || LBrace->is(tok::less))) {
    // If Left.ParameterCount is 0, then this submessage entry is not the
    // first in its parent submessage, and we want to break before this entry.
    // If Left.ParameterCount is greater than 0, then its parent submessage
    // might contain 1 or more entries and we want to break before this entry
    // if it contains at least 2 entries. We deal with this case later by
    // detecting and breaking before the next entry in the parent submessage.
    if (Left.ParameterCount == 0)
      return true;
    // However, if this submessage is the first entry in its parent
    // submessage, Left.ParameterCount might be 1 in some cases.
    // We deal with this case later by detecting an entry
    // following a closing paren of this submessage.
  }

  // If this is an entry immediately following a submessage, it will be
  // preceded by a closing paren of that submessage, like in:
  //     left---.  .---right
  //            v  v
  // sub: { ... } key: value
  // If there was a comment between `}` an `key` above, then `key` would be
  // put on a new line anyways.
  if (Left.isOneOf(tok::r_brace, tok::greater, tok::r_square))
    return true;
}

// Deal with lambda arguments in C++ - we want consistent line breaks whether
// they happen to be at arg0, arg1 or argN. The selection is a bit nuanced
// as aggressive line breaks are placed when the lambda is not the last arg.
if ((Style.Language == FormatStyle::LK_Cpp ||
     Style.Language == FormatStyle::LK_ObjC) &&
    Left.is(tok::l_paren) && Left.BlockParameterCount > 0 &&
    !Right.isOneOf(tok::l_paren, TT_LambdaLSquare)) {
  // Multiple lambdas in the same function call force line breaks.
  if (Left.BlockParameterCount > 1)
    return true;

  // A lambda followed by another arg forces a line break.
  if (!Left.Role)
    return false;
  auto Comma = Left.Role->lastComma();
  if (!Comma)
    return false;
  auto Next = Comma->getNextNonComment();
  if (!Next)
    return false;
  if (!Next->isOneOf(TT_LambdaLSquare, tok::l_brace, tok::caret))
    return true;
}

return false;
4101}

4103bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
                                  const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
// Language-specific stuff.
if (Style.isCSharp()) {
  if (Left.isOneOf(TT_CSharpNamedArgumentColon, TT_AttributeColon) ||
      Right.isOneOf(TT_CSharpNamedArgumentColon, TT_AttributeColon))
    return false;
  // Only break after commas for generic type constraints.
  if (Line.First->is(TT_CSharpGenericTypeConstraint))
    return Left.is(TT_CSharpGenericTypeConstraintComma);
  // Keep nullable operators attached to their identifiers.
  if (Right.is(TT_CSharpNullable)) {
    return false;
  }
} else if (Style.Language == FormatStyle::LK_Java) {
  if (Left.isOneOf(Keywords.kw_throws, Keywords.kw_extends,
                   Keywords.kw_implements))
    return false;
  if (Right.isOneOf(Keywords.kw_throws, Keywords.kw_extends,
                    Keywords.kw_implements))
    return true;
} else if (Style.isJavaScript()) {
  const FormatToken *NonComment = Right.getPreviousNonComment();
  if (NonComment &&
      NonComment->isOneOf(
          tok::kw_return, Keywords.kw_yield, tok::kw_continue, tok::kw_break,
          tok::kw_throw, Keywords.kw_interface, Keywords.kw_type,
          tok::kw_static, tok::kw_public, tok::kw_private, tok::kw_protected,
          Keywords.kw_readonly, Keywords.kw_override, Keywords.kw_abstract,
          Keywords.kw_get, Keywords.kw_set, Keywords.kw_async,
          Keywords.kw_await))
    return false; // Otherwise automatic semicolon insertion would trigger.
  if (Right.NestingLevel == 0 &&
      (Left.Tok.getIdentifierInfo() ||
       Left.isOneOf(tok::r_square, tok::r_paren)) &&
      Right.isOneOf(tok::l_square, tok::l_paren))
    return false; // Otherwise automatic semicolon insertion would trigger.
  if (NonComment && NonComment->is(tok::identifier) &&
      NonComment->TokenText == "asserts")
    return false;
  if (Left.is(TT_FatArrow) && Right.is(tok::l_brace))
    return false;
  if (Left.is(TT_JsTypeColon))
    return true;
  // Don't wrap between ":" and "!" of a strict prop init ("field!: type;").
  if (Left.is(tok::exclaim) && Right.is(tok::colon))
    return false;
  // Look for is type annotations like:
  // function f(): a is B { ... }
  // Do not break before is in these cases.
  if (Right.is(Keywords.kw_is)) {
    const FormatToken *Next = Right.getNextNonComment();
    // If `is` is followed by a colon, it's likely that it's a dict key, so
    // ignore it for this check.
    // For example this is common in Polymer:
    // Polymer({
    //   is: 'name',
    //   ...
    // });
    if (!Next || !Next->is(tok::colon))
      return false;
  }
  if (Left.is(Keywords.kw_in))
    return Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None;
  if (Right.is(Keywords.kw_in))
    return Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None;
  if (Right.is(Keywords.kw_as))
    return false; // must not break before as in 'x as type' casts
  if (Right.isOneOf(Keywords.kw_extends, Keywords.kw_infer)) {
    // extends and infer can appear as keywords in conditional types:
    //   https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-8.html#conditional-types
    // do not break before them, as the expressions are subject to ASI.
    return false;
  }
  if (Left.is(Keywords.kw_as))
    return true;
  if (Left.is(TT_NonNullAssertion))
    return true;
  if (Left.is(Keywords.kw_declare) &&
      Right.isOneOf(Keywords.kw_module, tok::kw_namespace,
                    Keywords.kw_function, tok::kw_class, tok::kw_enum,
                    Keywords.kw_interface, Keywords.kw_type, Keywords.kw_var,
                    Keywords.kw_let, tok::kw_const))
    // See grammar for 'declare' statements at:
    // https://github.com/Microsoft/TypeScript/blob/main/doc/spec-ARCHIVED.md#A.10
    return false;
  if (Left.isOneOf(Keywords.kw_module, tok::kw_namespace) &&
      Right.isOneOf(tok::identifier, tok::string_literal))
    return false; // must not break in "module foo { ...}"
  if (Right.is(TT_TemplateString) && Right.closesScope())
    return false;
  // Don't split tagged template literal so there is a break between the tag
  // identifier and template string.
  if (Left.is(tok::identifier) && Right.is(TT_TemplateString)) {
    return false;
  }
  if (Left.is(TT_TemplateString) && Left.opensScope())
    return true;
}

if (Left.is(tok::at))
  return false;
if (Left.Tok.getObjCKeywordID() == tok::objc_interface)
  return false;
if (Left.isOneOf(TT_JavaAnnotation, TT_LeadingJavaAnnotation))
  return !Right.is(tok::l_paren);
if (Right.is(TT_PointerOrReference))
  return Line.IsMultiVariableDeclStmt ||
         (getTokenPointerOrReferenceAlignment(Right) ==
              FormatStyle::PAS_Right &&
          (!Right.Next || Right.Next->isNot(TT_FunctionDeclarationName)));
if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
    Right.is(tok::kw_operator))
  return true;
if (Left.is(TT_PointerOrReference))
  return false;
if (Right.isTrailingComment())
  // We rely on MustBreakBefore being set correctly here as we should not
  // change the "binding" behavior of a comment.
  // The first comment in a braced lists is always interpreted as belonging to
  // the first list element. Otherwise, it should be placed outside of the
  // list.
  return Left.is(BK_BracedInit) ||
         (Left.is(TT_CtorInitializerColon) &&
          Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon);
if (Left.is(tok::question) && Right.is(tok::colon))
  return false;
if (Right.is(TT_ConditionalExpr) || Right.is(tok::question))
  return Style.BreakBeforeTernaryOperators;
if (Left.is(TT_ConditionalExpr) || Left.is(tok::question))
  return !Style.BreakBeforeTernaryOperators;
if (Left.is(TT_InheritanceColon))
  return Style.BreakInheritanceList == FormatStyle::BILS_AfterColon;
if (Right.is(TT_InheritanceColon))
  return Style.BreakInheritanceList != FormatStyle::BILS_AfterColon;
if (Right.is(TT_ObjCMethodExpr) && !Right.is(tok::r_square) &&
    Left.isNot(TT_SelectorName))
  return true;

if (Right.is(tok::colon) &&
    !Right.isOneOf(TT_CtorInitializerColon, TT_InlineASMColon))
  return false;
if (Left.is(tok::colon) && Left.isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)) {
  if (Style.Language == FormatStyle::LK_Proto ||
      Style.Language == FormatStyle::LK_TextProto) {
    if (!Style.AlwaysBreakBeforeMultilineStrings && Right.isStringLiteral())
      return false;
    // Prevent cases like:
    //
    // submessage:
    //     { key: valueeeeeeeeeeee }
    //
    // when the snippet does not fit into one line.
    // Prefer:
    //
    // submessage: {
    //   key: valueeeeeeeeeeee
    // }
    //
    // instead, even if it is longer by one line.
    //
    // Note that this allows allows the "{" to go over the column limit
    // when the column limit is just between ":" and "{", but that does
    // not happen too often and alternative formattings in this case are
    // not much better.
    //
    // The code covers the cases:
    //
    // submessage: { ... }
    // submessage: < ... >
    // repeated: [ ... ]
    if (((Right.is(tok::l_brace) || Right.is(tok::less)) &&
         Right.is(TT_DictLiteral)) ||
        Right.is(TT_ArrayInitializerLSquare))
      return false;
  }
  return true;
}
if (Right.is(tok::r_square) && Right.MatchingParen &&
    Right.MatchingParen->is(TT_ProtoExtensionLSquare))
  return false;
if (Right.is(TT_SelectorName) || (Right.is(tok::identifier) && Right.Next &&
                                  Right.Next->is(TT_ObjCMethodExpr)))
  return Left.isNot(tok::period); // FIXME: Properly parse ObjC calls.
if (Left.is(tok::r_paren) && Line.Type == LT_ObjCProperty)
  return true;
if (Left.ClosesTemplateDeclaration || Left.is(TT_FunctionAnnotationRParen))
  return true;
if (Right.isOneOf(TT_RangeBasedForLoopColon, TT_OverloadedOperatorLParen,
                  TT_OverloadedOperator))
  return false;
if (Left.is(TT_RangeBasedForLoopColon))
  return true;
if (Right.is(TT_RangeBasedForLoopColon))
  return false;
if (Left.is(TT_TemplateCloser) && Right.is(TT_TemplateOpener))
  return true;
if (Left.isOneOf(TT_TemplateCloser, TT_UnaryOperator) ||
    Left.is(tok::kw_operator))
  return false;
if (Left.is(tok::equal) && !Right.isOneOf(tok::kw_default, tok::kw_delete) &&
    Line.Type == LT_VirtualFunctionDecl && Left.NestingLevel == 0)
  return false;
if (Left.is(tok::equal) && Right.is(tok::l_brace) &&
    !Style.Cpp11BracedListStyle)
  return false;
if (Left.is(tok::l_paren) &&
    Left.isOneOf(TT_AttributeParen, TT_TypeDeclarationParen))
  return false;
if (Left.is(tok::l_paren) && Left.Previous &&
    (Left.Previous->isOneOf(TT_BinaryOperator, TT_CastRParen)))
  return false;
if (Right.is(TT_ImplicitStringLiteral))
  return false;

if (Right.is(TT_TemplateCloser))
  return false;
if (Right.is(tok::r_square) && Right.MatchingParen &&
    Right.MatchingParen->is(TT_LambdaLSquare))
  return false;

// We only break before r_brace if there was a corresponding break before
// the l_brace, which is tracked by BreakBeforeClosingBrace.
if (Right.is(tok::r_brace))
  return Right.MatchingParen && Right.MatchingParen->is(BK_Block);

// We only break before r_paren if we're in a block indented context.
if (Right.is(tok::r_paren)) {
  if (Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent) {
    return Right.MatchingParen &&
           !(Right.MatchingParen->Previous &&
             (Right.MatchingParen->Previous->is(tok::kw_for) ||
              Right.MatchingParen->Previous->isIf()));
  }

  return false;
}

// Allow breaking after a trailing annotation, e.g. after a method
// declaration.
if (Left.is(TT_TrailingAnnotation))
  return !Right.isOneOf(tok::l_brace, tok::semi, tok::equal, tok::l_paren,
                        tok::less, tok::coloncolon);

if (Right.is(tok::kw___attribute) ||
    (Right.is(tok::l_square) && Right.is(TT_AttributeSquare)))
  return !Left.is(TT_AttributeSquare);

if (Left.is(tok::identifier) && Right.is(tok::string_literal))
  return true;

if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
  return true;

if (Left.is(TT_CtorInitializerColon))
  return Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
if (Right.is(TT_CtorInitializerColon))
  return Style.BreakConstructorInitializers != FormatStyle::BCIS_AfterColon;
if (Left.is(TT_CtorInitializerComma) &&
    Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma)
  return false;
if (Right.is(TT_CtorInitializerComma) &&
    Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma)
  return true;
if (Left.is(TT_InheritanceComma) &&
    Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma)
  return false;
if (Right.is(TT_InheritanceComma) &&
    Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma)
  return true;
if ((Left.is(tok::greater) && Right.is(tok::greater)) ||
    (Left.is(tok::less) && Right.is(tok::less)))
  return false;
if (Right.is(TT_BinaryOperator) &&
    Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None &&
    (Style.BreakBeforeBinaryOperators == FormatStyle::BOS_All ||
     Right.getPrecedence() != prec::Assignment))
  return true;
if (Left.is(TT_ArrayInitializerLSquare))
  return true;
if (Right.is(tok::kw_typename) && Left.isNot(tok::kw_const))
  return true;
if ((Left.isBinaryOperator() || Left.is(TT_BinaryOperator)) &&
    !Left.isOneOf(tok::arrowstar, tok::lessless) &&
    Style.BreakBeforeBinaryOperators != FormatStyle::BOS_All &&
    (Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None ||
     Left.getPrecedence() == prec::Assignment))
  return true;
if ((Left.is(TT_AttributeSquare) && Right.is(tok::l_square)) ||
    (Left.is(tok::r_square) && Right.is(TT_AttributeSquare)))
  return false;

auto ShortLambdaOption = Style.AllowShortLambdasOnASingleLine;
if (Style.BraceWrapping.BeforeLambdaBody && Right.is(TT_LambdaLBrace)) {
  if (isAllmanLambdaBrace(Left))
    return !isItAnEmptyLambdaAllowed(Left, ShortLambdaOption);
  if (isAllmanLambdaBrace(Right))
    return !isItAnEmptyLambdaAllowed(Right, ShortLambdaOption);
}

return Left.isOneOf(tok::comma, tok::coloncolon, tok::semi, tok::l_brace,
                    tok::kw_class, tok::kw_struct, tok::comment) ||
       Right.isMemberAccess() ||
       Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow, tok::lessless,
                     tok::colon, tok::l_square, tok::at) ||
       (Left.is(tok::r_paren) &&
        Right.isOneOf(tok::identifier, tok::kw_const)) ||
       (Left.is(tok::l_paren) && !Right.is(tok::r_paren)) ||
       (Left.is(TT_TemplateOpener) && !Right.is(TT_TemplateCloser));
4413}

4415void TokenAnnotator::printDebugInfo(const AnnotatedLine &Line) {
llvm::errs() << "AnnotatedTokens(L=" << Line.Level << "):\n";
const FormatToken *Tok = Line.First;
while (Tok) {
  llvm::errs() << " M=" << Tok->MustBreakBefore
               << " C=" << Tok->CanBreakBefore
               << " T=" << getTokenTypeName(Tok->getType())
               << " S=" << Tok->SpacesRequiredBefore
               << " F=" << Tok->Finalized << " B=" << Tok->BlockParameterCount
               << " BK=" << Tok->getBlockKind() << " P=" << Tok->SplitPenalty
               << " Name=" << Tok->Tok.getName() << " L=" << Tok->TotalLength
               << " PPK=" << Tok->getPackingKind() << " FakeLParens=";
  for (unsigned i = 0, e = Tok->FakeLParens.size(); i != e; ++i)
    llvm::errs() << Tok->FakeLParens[i] << "/";
  llvm::errs() << " FakeRParens=" << Tok->FakeRParens;
  llvm::errs() << " II=" << Tok->Tok.getIdentifierInfo();
  llvm::errs() << " Text='" << Tok->TokenText << "'\n";
  if (!Tok->Next)
    assert(Tok == Line.Last)(static_cast <bool> (Tok == Line.Last) ? void (0) : __assert_fail
 ("Tok == Line.Last", "clang/lib/Format/TokenAnnotator.cpp", 4433
, __extension__ __PRETTY_FUNCTION__));
  Tok = Tok->Next;
}
llvm::errs() << "----\n";
4437}

4439FormatStyle::PointerAlignmentStyle
4440TokenAnnotator::getTokenReferenceAlignment(const FormatToken &Reference) {
assert(Reference.isOneOf(tok::amp, tok::ampamp))(static_cast <bool> (Reference.isOneOf(tok::amp, tok::ampamp
)) ? void (0) : __assert_fail ("Reference.isOneOf(tok::amp, tok::ampamp)"
, "clang/lib/Format/TokenAnnotator.cpp", 4441, __extension__ __PRETTY_FUNCTION__
));
switch (Style.ReferenceAlignment) {
case FormatStyle::RAS_Pointer:
  return Style.PointerAlignment;
case FormatStyle::RAS_Left:
  return FormatStyle::PAS_Left;
case FormatStyle::RAS_Right:
  return FormatStyle::PAS_Right;
case FormatStyle::RAS_Middle:
  return FormatStyle::PAS_Middle;
}
assert(0)(static_cast <bool> (0) ? void (0) : __assert_fail ("0"
, "clang/lib/Format/TokenAnnotator.cpp", 4452, __extension__ __PRETTY_FUNCTION__
)); //"Unhandled value of ReferenceAlignment"
return Style.PointerAlignment;
4454}

4456FormatStyle::PointerAlignmentStyle
4457TokenAnnotator::getTokenPointerOrReferenceAlignment(
  const FormatToken &PointerOrReference) {
if (PointerOrReference.isOneOf(tok::amp, tok::ampamp)) {
  switch (Style.ReferenceAlignment) {
  case FormatStyle::RAS_Pointer:
    return Style.PointerAlignment;
  case FormatStyle::RAS_Left:
    return FormatStyle::PAS_Left;
  case FormatStyle::RAS_Right:
    return FormatStyle::PAS_Right;
  case FormatStyle::RAS_Middle:
    return FormatStyle::PAS_Middle;
  }
}
assert(PointerOrReference.is(tok::star))(static_cast <bool> (PointerOrReference.is(tok::star)) ?
 void (0) : __assert_fail ("PointerOrReference.is(tok::star)"
, "clang/lib/Format/TokenAnnotator.cpp", 4471, __extension__ __PRETTY_FUNCTION__
));
return Style.PointerAlignment;
4473}

4475} // namespace format
4476} // namespace clang