1 files changed, 2229 insertions, 0 deletions

diff --git a/contrib/llvm-project/clang/lib/Format/ContinuationIndenter.cpp b/contrib/llvm-project/clang/lib/Format/ContinuationIndenter.cpp
new file mode 100644
index 000000000000..b04ede6fa939
--- /dev/null
+++ b/contrib/llvm-project/clang/lib/Format/ContinuationIndenter.cpp
@@ -0,0 +1,2229 @@
+//===--- ContinuationIndenter.cpp - Format C++ code -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements the continuation indenter.
+///
+//===----------------------------------------------------------------------===//
+
+#include "ContinuationIndenter.h"
+#include "BreakableToken.h"
+#include "FormatInternal.h"
+#include "WhitespaceManager.h"
+#include "clang/Basic/OperatorPrecedence.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Format/Format.h"
+#include "llvm/Support/Debug.h"
+
+#define DEBUG_TYPE "format-indenter"
+
+namespace clang {
+namespace format {
+
+// Returns true if a TT_SelectorName should be indented when wrapped,
+// false otherwise.
+static bool shouldIndentWrappedSelectorName(const FormatStyle &Style,
+                                            LineType LineType) {
+  return Style.IndentWrappedFunctionNames || LineType == LT_ObjCMethodDecl;
+}
+
+// Returns the length of everything up to the first possible line break after
+// the ), ], } or > matching \c Tok.
+static unsigned getLengthToMatchingParen(const FormatToken &Tok,
+                                         const std::vector<ParenState> &Stack) {
+  // Normally whether or not a break before T is possible is calculated and
+  // stored in T.CanBreakBefore. Braces, array initializers and text proto
+  // messages like `key: < ... >` are an exception: a break is possible
+  // before a closing brace R if a break was inserted after the corresponding
+  // opening brace. The information about whether or not a break is needed
+  // before a closing brace R is stored in the ParenState field
+  // S.BreakBeforeClosingBrace where S is the state that R closes.
+  //
+  // In order to decide whether there can be a break before encountered right
+  // braces, this implementation iterates over the sequence of tokens and over
+  // the paren stack in lockstep, keeping track of the stack level which visited
+  // right braces correspond to in MatchingStackIndex.
+  //
+  // For example, consider:
+  // L. <- line number
+  // 1. {
+  // 2. {1},
+  // 3. {2},
+  // 4. {{3}}}
+  //     ^ where we call this method with this token.
+  // The paren stack at this point contains 3 brace levels:
+  //  0. { at line 1, BreakBeforeClosingBrace: true
+  //  1. first { at line 4, BreakBeforeClosingBrace: false
+  //  2. second { at line 4, BreakBeforeClosingBrace: false,
+  //  where there might be fake parens levels in-between these levels.
+  // The algorithm will start at the first } on line 4, which is the matching
+  // brace of the initial left brace and at level 2 of the stack. Then,
+  // examining BreakBeforeClosingBrace: false at level 2, it will continue to
+  // the second } on line 4, and will traverse the stack downwards until it
+  // finds the matching { on level 1. Then, examining BreakBeforeClosingBrace:
+  // false at level 1, it will continue to the third } on line 4 and will
+  // traverse the stack downwards until it finds the matching { on level 0.
+  // Then, examining BreakBeforeClosingBrace: true at level 0, the algorithm
+  // will stop and will use the second } on line 4 to determine the length to
+  // return, as in this example the range will include the tokens: {3}}
+  //
+  // The algorithm will only traverse the stack if it encounters braces, array
+  // initializer squares or text proto angle brackets.
+  if (!Tok.MatchingParen)
+    return 0;
+  FormatToken *End = Tok.MatchingParen;
+  // Maintains a stack level corresponding to the current End token.
+  int MatchingStackIndex = Stack.size() - 1;
+  // Traverses the stack downwards, looking for the level to which LBrace
+  // corresponds. Returns either a pointer to the matching level or nullptr if
+  // LParen is not found in the initial portion of the stack up to
+  // MatchingStackIndex.
+  auto FindParenState = [&](const FormatToken *LBrace) -> const ParenState * {
+    while (MatchingStackIndex >= 0 && Stack[MatchingStackIndex].Tok != LBrace)
+      --MatchingStackIndex;
+    return MatchingStackIndex >= 0 ? &Stack[MatchingStackIndex] : nullptr;
+  };
+  for (; End->Next; End = End->Next) {
+    if (End->Next->CanBreakBefore)
+      break;
+    if (!End->Next->closesScope())
+      continue;
+    if (End->Next->MatchingParen &&
+        End->Next->MatchingParen->isOneOf(
+            tok::l_brace, TT_ArrayInitializerLSquare, tok::less)) {
+      const ParenState *State = FindParenState(End->Next->MatchingParen);
+      if (State && State->BreakBeforeClosingBrace)
+        break;
+    }
+  }
+  return End->TotalLength - Tok.TotalLength + 1;
+}
+
+static unsigned getLengthToNextOperator(const FormatToken &Tok) {
+  if (!Tok.NextOperator)
+    return 0;
+  return Tok.NextOperator->TotalLength - Tok.TotalLength;
+}
+
+// Returns \c true if \c Tok is the "." or "->" of a call and starts the next
+// segment of a builder type call.
+static bool startsSegmentOfBuilderTypeCall(const FormatToken &Tok) {
+  return Tok.isMemberAccess() && Tok.Previous && Tok.Previous->closesScope();
+}
+
+// Returns \c true if \c Current starts a new parameter.
+static bool startsNextParameter(const FormatToken &Current,
+                                const FormatStyle &Style) {
+  const FormatToken &Previous = *Current.Previous;
+  if (Current.is(TT_CtorInitializerComma) &&
+      Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma)
+    return true;
+  if (Style.Language == FormatStyle::LK_Proto && Current.is(TT_SelectorName))
+    return true;
+  return Previous.is(tok::comma) && !Current.isTrailingComment() &&
+         ((Previous.isNot(TT_CtorInitializerComma) ||
+           Style.BreakConstructorInitializers !=
+               FormatStyle::BCIS_BeforeComma) &&
+          (Previous.isNot(TT_InheritanceComma) ||
+           Style.BreakInheritanceList != FormatStyle::BILS_BeforeComma));
+}
+
+static bool opensProtoMessageField(const FormatToken &LessTok,
+                                   const FormatStyle &Style) {
+  if (LessTok.isNot(tok::less))
+    return false;
+  return Style.Language == FormatStyle::LK_TextProto ||
+         (Style.Language == FormatStyle::LK_Proto &&
+          (LessTok.NestingLevel > 0 ||
+           (LessTok.Previous && LessTok.Previous->is(tok::equal))));
+}
+
+// Returns the delimiter of a raw string literal, or None if TokenText is not
+// the text of a raw string literal. The delimiter could be the empty string.
+// For example, the delimiter of R"deli(cont)deli" is deli.
+static llvm::Optional<StringRef> getRawStringDelimiter(StringRef TokenText) {
+  if (TokenText.size() < 5 // The smallest raw string possible is 'R"()"'.
+      || !TokenText.startswith("R\"") || !TokenText.endswith("\""))
+    return None;
+
+  // A raw string starts with 'R"<delimiter>(' and delimiter is ascii and has
+  // size at most 16 by the standard, so the first '(' must be among the first
+  // 19 bytes.
+  size_t LParenPos = TokenText.substr(0, 19).find_first_of('(');
+  if (LParenPos == StringRef::npos)
+    return None;
+  StringRef Delimiter = TokenText.substr(2, LParenPos - 2);
+
+  // Check that the string ends in ')Delimiter"'.
+  size_t RParenPos = TokenText.size() - Delimiter.size() - 2;
+  if (TokenText[RParenPos] != ')')
+    return None;
+  if (!TokenText.substr(RParenPos + 1).startswith(Delimiter))
+    return None;
+  return Delimiter;
+}
+
+// Returns the canonical delimiter for \p Language, or the empty string if no
+// canonical delimiter is specified.
+static StringRef
+getCanonicalRawStringDelimiter(const FormatStyle &Style,
+                               FormatStyle::LanguageKind Language) {
+  for (const auto &Format : Style.RawStringFormats) {
+    if (Format.Language == Language)
+      return StringRef(Format.CanonicalDelimiter);
+  }
+  return "";
+}
+
+RawStringFormatStyleManager::RawStringFormatStyleManager(
+    const FormatStyle &CodeStyle) {
+  for (const auto &RawStringFormat : CodeStyle.RawStringFormats) {
+    llvm::Optional<FormatStyle> LanguageStyle =
+        CodeStyle.GetLanguageStyle(RawStringFormat.Language);
+    if (!LanguageStyle) {
+      FormatStyle PredefinedStyle;
+      if (!getPredefinedStyle(RawStringFormat.BasedOnStyle,
+                              RawStringFormat.Language, &PredefinedStyle)) {
+        PredefinedStyle = getLLVMStyle();
+        PredefinedStyle.Language = RawStringFormat.Language;
+      }
+      LanguageStyle = PredefinedStyle;
+    }
+    LanguageStyle->ColumnLimit = CodeStyle.ColumnLimit;
+    for (StringRef Delimiter : RawStringFormat.Delimiters) {
+      DelimiterStyle.insert({Delimiter, *LanguageStyle});
+    }
+    for (StringRef EnclosingFunction : RawStringFormat.EnclosingFunctions) {
+      EnclosingFunctionStyle.insert({EnclosingFunction, *LanguageStyle});
+    }
+  }
+}
+
+llvm::Optional<FormatStyle>
+RawStringFormatStyleManager::getDelimiterStyle(StringRef Delimiter) const {
+  auto It = DelimiterStyle.find(Delimiter);
+  if (It == DelimiterStyle.end())
+    return None;
+  return It->second;
+}
+
+llvm::Optional<FormatStyle>
+RawStringFormatStyleManager::getEnclosingFunctionStyle(
+    StringRef EnclosingFunction) const {
+  auto It = EnclosingFunctionStyle.find(EnclosingFunction);
+  if (It == EnclosingFunctionStyle.end())
+    return None;
+  return It->second;
+}
+
+ContinuationIndenter::ContinuationIndenter(const FormatStyle &Style,
+                                           const AdditionalKeywords &Keywords,
+                                           const SourceManager &SourceMgr,
+                                           WhitespaceManager &Whitespaces,
+                                           encoding::Encoding Encoding,
+                                           bool BinPackInconclusiveFunctions)
+    : Style(Style), Keywords(Keywords), SourceMgr(SourceMgr),
+      Whitespaces(Whitespaces), Encoding(Encoding),
+      BinPackInconclusiveFunctions(BinPackInconclusiveFunctions),
+      CommentPragmasRegex(Style.CommentPragmas), RawStringFormats(Style) {}
+
+LineState ContinuationIndenter::getInitialState(unsigned FirstIndent,
+                                                unsigned FirstStartColumn,
+                                                const AnnotatedLine *Line,
+                                                bool DryRun) {
+  LineState State;
+  State.FirstIndent = FirstIndent;
+  if (FirstStartColumn && Line->First->NewlinesBefore == 0)
+    State.Column = FirstStartColumn;
+  else
+    State.Column = FirstIndent;
+  // With preprocessor directive indentation, the line starts on column 0
+  // since it's indented after the hash, but FirstIndent is set to the
+  // preprocessor indent.
+  if (Style.IndentPPDirectives == FormatStyle::PPDIS_AfterHash &&
+      (Line->Type == LT_PreprocessorDirective ||
+       Line->Type == LT_ImportStatement))
+    State.Column = 0;
+  State.Line = Line;
+  State.NextToken = Line->First;
+  State.Stack.push_back(ParenState(/*Tok=*/nullptr, FirstIndent, FirstIndent,
+                                   /*AvoidBinPacking=*/false,
+                                   /*NoLineBreak=*/false));
+  State.LineContainsContinuedForLoopSection = false;
+  State.NoContinuation = false;
+  State.StartOfStringLiteral = 0;
+  State.StartOfLineLevel = 0;
+  State.LowestLevelOnLine = 0;
+  State.IgnoreStackForComparison = false;
+
+  if (Style.Language == FormatStyle::LK_TextProto) {
+    // We need this in order to deal with the bin packing of text fields at
+    // global scope.
+    State.Stack.back().AvoidBinPacking = true;
+    State.Stack.back().BreakBeforeParameter = true;
+    State.Stack.back().AlignColons = false;
+  }
+
+  // The first token has already been indented and thus consumed.
+  moveStateToNextToken(State, DryRun, /*Newline=*/false);
+  return State;
+}
+
+bool ContinuationIndenter::canBreak(const LineState &State) {
+  const FormatToken &Current = *State.NextToken;
+  const FormatToken &Previous = *Current.Previous;
+  assert(&Previous == Current.Previous);
+  if (!Current.CanBreakBefore && !(State.Stack.back().BreakBeforeClosingBrace &&
+                                   Current.closesBlockOrBlockTypeList(Style)))
+    return false;
+  // The opening "{" of a braced list has to be on the same line as the first
+  // element if it is nested in another braced init list or function call.
+  if (!Current.MustBreakBefore && Previous.is(tok::l_brace) &&
+      Previous.isNot(TT_DictLiteral) && Previous.BlockKind == BK_BracedInit &&
+      Previous.Previous &&
+      Previous.Previous->isOneOf(tok::l_brace, tok::l_paren, tok::comma))
+    return false;
+  // This prevents breaks like:
+  //   ...
+  //   SomeParameter, OtherParameter).DoSomething(
+  //   ...
+  // As they hide "DoSomething" and are generally bad for readability.
+  if (Previous.opensScope() && Previous.isNot(tok::l_brace) &&
+      State.LowestLevelOnLine < State.StartOfLineLevel &&
+      State.LowestLevelOnLine < Current.NestingLevel)
+    return false;
+  if (Current.isMemberAccess() && State.Stack.back().ContainsUnwrappedBuilder)
+    return false;
+
+  // Don't create a 'hanging' indent if there are multiple blocks in a single
+  // statement.
+  if (Previous.is(tok::l_brace) && State.Stack.size() > 1 &&
+      State.Stack[State.Stack.size() - 2].NestedBlockInlined &&
+      State.Stack[State.Stack.size() - 2].HasMultipleNestedBlocks)
+    return false;
+
+  // Don't break after very short return types (e.g. "void") as that is often
+  // unexpected.
+  if (Current.is(TT_FunctionDeclarationName) && State.Column < 6) {
+    if (Style.AlwaysBreakAfterReturnType == FormatStyle::RTBS_None)
+      return false;
+  }
+
+  // If binary operators are moved to the next line (including commas for some
+  // styles of constructor initializers), that's always ok.
+  if (!Current.isOneOf(TT_BinaryOperator, tok::comma) &&
+      State.Stack.back().NoLineBreakInOperand)
+    return false;
+
+  if (Previous.is(tok::l_square) && Previous.is(TT_ObjCMethodExpr))
+    return false;
+
+  return !State.Stack.back().NoLineBreak;
+}
+
+bool ContinuationIndenter::mustBreak(const LineState &State) {
+  const FormatToken &Current = *State.NextToken;
+  const FormatToken &Previous = *Current.Previous;
+  if (Current.MustBreakBefore || Current.is(TT_InlineASMColon))
+    return true;
+  if (State.Stack.back().BreakBeforeClosingBrace &&
+      Current.closesBlockOrBlockTypeList(Style))
+    return true;
+  if (Previous.is(tok::semi) && State.LineContainsContinuedForLoopSection)
+    return true;
+  if (Style.Language == FormatStyle::LK_ObjC &&
+      Current.ObjCSelectorNameParts > 1 &&
+      Current.startsSequence(TT_SelectorName, tok::colon, tok::caret)) {
+    return true;
+  }
+  if ((startsNextParameter(Current, Style) || Previous.is(tok::semi) ||
+       (Previous.is(TT_TemplateCloser) && Current.is(TT_StartOfName) &&
+        Style.isCpp() &&
+        // FIXME: This is a temporary workaround for the case where clang-format
+        // sets BreakBeforeParameter to avoid bin packing and this creates a
+        // completely unnecessary line break after a template type that isn't
+        // line-wrapped.
+        (Previous.NestingLevel == 1 || Style.BinPackParameters)) ||
+       (Style.BreakBeforeTernaryOperators && Current.is(TT_ConditionalExpr) &&
+        Previous.isNot(tok::question)) ||
+       (!Style.BreakBeforeTernaryOperators &&
+        Previous.is(TT_ConditionalExpr))) &&
+      State.Stack.back().BreakBeforeParameter && !Current.isTrailingComment() &&
+      !Current.isOneOf(tok::r_paren, tok::r_brace))
+    return true;
+  if (((Previous.is(TT_DictLiteral) && Previous.is(tok::l_brace)) ||
+       (Previous.is(TT_ArrayInitializerLSquare) &&
+        Previous.ParameterCount > 1) ||
+       opensProtoMessageField(Previous, Style)) &&
+      Style.ColumnLimit > 0 &&
+      getLengthToMatchingParen(Previous, State.Stack) + State.Column - 1 >
+          getColumnLimit(State))
+    return true;
+
+  const FormatToken &BreakConstructorInitializersToken =
+      Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon
+          ? Previous
+          : Current;
+  if (BreakConstructorInitializersToken.is(TT_CtorInitializerColon) &&
+      (State.Column + State.Line->Last->TotalLength - Previous.TotalLength >
+           getColumnLimit(State) ||
+       State.Stack.back().BreakBeforeParameter) &&
+      (Style.AllowShortFunctionsOnASingleLine != FormatStyle::SFS_All ||
+       Style.BreakConstructorInitializers != FormatStyle::BCIS_BeforeColon ||
+       Style.ColumnLimit != 0))
+    return true;
+
+  if (Current.is(TT_ObjCMethodExpr) && !Previous.is(TT_SelectorName) &&
+      State.Line->startsWith(TT_ObjCMethodSpecifier))
+    return true;
+  if (Current.is(TT_SelectorName) && !Previous.is(tok::at) &&
+      State.Stack.back().ObjCSelectorNameFound &&
+      State.Stack.back().BreakBeforeParameter)
+    return true;
+
+  unsigned NewLineColumn = getNewLineColumn(State);
+  if (Current.isMemberAccess() && Style.ColumnLimit != 0 &&
+      State.Column + getLengthToNextOperator(Current) > Style.ColumnLimit &&
+      (State.Column > NewLineColumn ||
+       Current.NestingLevel < State.StartOfLineLevel))
+    return true;
+
+  if (startsSegmentOfBuilderTypeCall(Current) &&
+      (State.Stack.back().CallContinuation != 0 ||
+       State.Stack.back().BreakBeforeParameter) &&
+      // JavaScript is treated different here as there is a frequent pattern:
+      //   SomeFunction(function() {
+      //     ...
+      //   }.bind(...));
+      // FIXME: We should find a more generic solution to this problem.
+      !(State.Column <= NewLineColumn &&
+        Style.Language == FormatStyle::LK_JavaScript) &&
+      !(Previous.closesScopeAfterBlock() && State.Column <= NewLineColumn))
+    return true;
+
+  // If the template declaration spans multiple lines, force wrap before the
+  // function/class declaration
+  if (Previous.ClosesTemplateDeclaration &&
+      State.Stack.back().BreakBeforeParameter && Current.CanBreakBefore)
+    return true;
+
+  if (State.Column <= NewLineColumn)
+    return false;
+
+  if (Style.AlwaysBreakBeforeMultilineStrings &&
+      (NewLineColumn == State.FirstIndent + Style.ContinuationIndentWidth ||
+       Previous.is(tok::comma) || Current.NestingLevel < 2) &&
+      !Previous.isOneOf(tok::kw_return, tok::lessless, tok::at,
+                        Keywords.kw_dollar) &&
+      !Previous.isOneOf(TT_InlineASMColon, TT_ConditionalExpr) &&
+      nextIsMultilineString(State))
+    return true;
+
+  // Using CanBreakBefore here and below takes care of the decision whether the
+  // current style uses wrapping before or after operators for the given
+  // operator.
+  if (Previous.is(TT_BinaryOperator) && Current.CanBreakBefore) {
+    // If we need to break somewhere inside the LHS of a binary expression, we
+    // should also break after the operator. Otherwise, the formatting would
+    // hide the operator precedence, e.g. in:
+    //   if (aaaaaaaaaaaaaa ==
+    //           bbbbbbbbbbbbbb && c) {..
+    // For comparisons, we only apply this rule, if the LHS is a binary
+    // expression itself as otherwise, the line breaks seem superfluous.
+    // We need special cases for ">>" which we have split into two ">" while
+    // lexing in order to make template parsing easier.
+    bool IsComparison = (Previous.getPrecedence() == prec::Relational ||
+                         Previous.getPrecedence() == prec::Equality ||
+                         Previous.getPrecedence() == prec::Spaceship) &&
+                        Previous.Previous &&
+                        Previous.Previous->isNot(TT_BinaryOperator); // For >>.
+    bool LHSIsBinaryExpr =
+        Previous.Previous && Previous.Previous->EndsBinaryExpression;
+    if ((!IsComparison || LHSIsBinaryExpr) && !Current.isTrailingComment() &&
+        Previous.getPrecedence() != prec::Assignment &&
+        State.Stack.back().BreakBeforeParameter)
+      return true;
+  } else if (Current.is(TT_BinaryOperator) && Current.CanBreakBefore &&
+             State.Stack.back().BreakBeforeParameter) {
+    return true;
+  }
+
+  // Same as above, but for the first "<<" operator.
+  if (Current.is(tok::lessless) && Current.isNot(TT_OverloadedOperator) &&
+      State.Stack.back().BreakBeforeParameter &&
+      State.Stack.back().FirstLessLess == 0)
+    return true;
+
+  if (Current.NestingLevel == 0 && !Current.isTrailingComment()) {
+    // Always break after "template <...>" and leading annotations. This is only
+    // for cases where the entire line does not fit on a single line as a
+    // different LineFormatter would be used otherwise.
+    if (Previous.ClosesTemplateDeclaration)
+      return Style.AlwaysBreakTemplateDeclarations != FormatStyle::BTDS_No;
+    if (Previous.is(TT_FunctionAnnotationRParen))
+      return true;
+    if (Previous.is(TT_LeadingJavaAnnotation) && Current.isNot(tok::l_paren) &&
+        Current.isNot(TT_LeadingJavaAnnotation))
+      return true;
+  }
+
+  // If the return type spans multiple lines, wrap before the function name.
+  if ((Current.is(TT_FunctionDeclarationName) ||
+       (Current.is(tok::kw_operator) && !Previous.is(tok::coloncolon))) &&
+      !Previous.is(tok::kw_template) && State.Stack.back().BreakBeforeParameter)
+    return true;
+
+  // The following could be precomputed as they do not depend on the state.
+  // However, as they should take effect only if the UnwrappedLine does not fit
+  // into the ColumnLimit, they are checked here in the ContinuationIndenter.
+  if (Style.ColumnLimit != 0 && Previous.BlockKind == BK_Block &&
+      Previous.is(tok::l_brace) && !Current.isOneOf(tok::r_brace, tok::comment))
+    return true;
+
+  if (Current.is(tok::lessless) &&
+      ((Previous.is(tok::identifier) && Previous.TokenText == "endl") ||
+       (Previous.Tok.isLiteral() && (Previous.TokenText.endswith("\\n\"") ||
+                                     Previous.TokenText == "\'\\n\'"))))
+    return true;
+
+  if (Previous.is(TT_BlockComment) && Previous.IsMultiline)
+    return true;
+
+  if (State.NoContinuation)
+    return true;
+
+  return false;
+}
+
+unsigned ContinuationIndenter::addTokenToState(LineState &State, bool Newline,
+                                               bool DryRun,
+                                               unsigned ExtraSpaces) {
+  const FormatToken &Current = *State.NextToken;
+
+  assert(!State.Stack.empty());
+  State.NoContinuation = false;
+
+  if ((Current.is(TT_ImplicitStringLiteral) &&
+       (Current.Previous->Tok.getIdentifierInfo() == nullptr ||
+        Current.Previous->Tok.getIdentifierInfo()->getPPKeywordID() ==
+            tok::pp_not_keyword))) {
+    unsigned EndColumn =
+        SourceMgr.getSpellingColumnNumber(Current.WhitespaceRange.getEnd());
+    if (Current.LastNewlineOffset != 0) {
+      // If there is a newline within this token, the final column will solely
+      // determined by the current end column.
+      State.Column = EndColumn;
+    } else {
+      unsigned StartColumn =
+          SourceMgr.getSpellingColumnNumber(Current.WhitespaceRange.getBegin());
+      assert(EndColumn >= StartColumn);
+      State.Column += EndColumn - StartColumn;
+    }
+    moveStateToNextToken(State, DryRun, /*Newline=*/false);
+    return 0;
+  }
+
+  unsigned Penalty = 0;
+  if (Newline)
+    Penalty = addTokenOnNewLine(State, DryRun);
+  else
+    addTokenOnCurrentLine(State, DryRun, ExtraSpaces);
+
+  return moveStateToNextToken(State, DryRun, Newline) + Penalty;
+}
+
+void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
+                                                 unsigned ExtraSpaces) {
+  FormatToken &Current = *State.NextToken;
+  const FormatToken &Previous = *State.NextToken->Previous;
+  if (Current.is(tok::equal) &&
+      (State.Line->First->is(tok::kw_for) || Current.NestingLevel == 0) &&
+      State.Stack.back().VariablePos == 0) {
+    State.Stack.back().VariablePos = State.Column;
+    // Move over * and & if they are bound to the variable name.
+    const FormatToken *Tok = &Previous;
+    while (Tok && State.Stack.back().VariablePos >= Tok->ColumnWidth) {
+      State.Stack.back().VariablePos -= Tok->ColumnWidth;
+      if (Tok->SpacesRequiredBefore != 0)
+        break;
+      Tok = Tok->Previous;
+    }
+    if (Previous.PartOfMultiVariableDeclStmt)
+      State.Stack.back().LastSpace = State.Stack.back().VariablePos;
+  }
+
+  unsigned Spaces = Current.SpacesRequiredBefore + ExtraSpaces;
+
+  // Indent preprocessor directives after the hash if required.
+  int PPColumnCorrection = 0;
+  if (Style.IndentPPDirectives == FormatStyle::PPDIS_AfterHash &&
+      Previous.is(tok::hash) && State.FirstIndent > 0 &&
+      (State.Line->Type == LT_PreprocessorDirective ||
+       State.Line->Type == LT_ImportStatement)) {
+    Spaces += State.FirstIndent;
+
+    // For preprocessor indent with tabs, State.Column will be 1 because of the
+    // hash. This causes second-level indents onward to have an extra space
+    // after the tabs. We avoid this misalignment by subtracting 1 from the
+    // column value passed to replaceWhitespace().
+    if (Style.UseTab != FormatStyle::UT_Never)
+      PPColumnCorrection = -1;
+  }
+
+  if (!DryRun)
+    Whitespaces.replaceWhitespace(Current, /*Newlines=*/0, Spaces,
+                                  State.Column + Spaces + PPColumnCorrection);
+
+  // If "BreakBeforeInheritanceComma" mode, don't break within the inheritance
+  // declaration unless there is multiple inheritance.
+  if (Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma &&
+      Current.is(TT_InheritanceColon))
+    State.Stack.back().NoLineBreak = true;
+  if (Style.BreakInheritanceList == FormatStyle::BILS_AfterColon &&
+      Previous.is(TT_InheritanceColon))
+    State.Stack.back().NoLineBreak = true;
+
+  if (Current.is(TT_SelectorName) &&
+      !State.Stack.back().ObjCSelectorNameFound) {
+    unsigned MinIndent =
+        std::max(State.FirstIndent + Style.ContinuationIndentWidth,
+                 State.Stack.back().Indent);
+    unsigned FirstColonPos = State.Column + Spaces + Current.ColumnWidth;
+    if (Current.LongestObjCSelectorName == 0)
+      State.Stack.back().AlignColons = false;
+    else if (MinIndent + Current.LongestObjCSelectorName > FirstColonPos)
+      State.Stack.back().ColonPos = MinIndent + Current.LongestObjCSelectorName;
+    else
+      State.Stack.back().ColonPos = FirstColonPos;
+  }
+
+  // In "AlwaysBreak" mode, enforce wrapping directly after the parenthesis by
+  // disallowing any further line breaks if there is no line break after the
+  // opening parenthesis. Don't break if it doesn't conserve columns.
+  if (Style.AlignAfterOpenBracket == FormatStyle::BAS_AlwaysBreak &&
+      Previous.isOneOf(tok::l_paren, TT_TemplateOpener, tok::l_square) &&
+      State.Column > getNewLineColumn(State) &&
+      (!Previous.Previous || !Previous.Previous->isOneOf(
+                                 tok::kw_for, tok::kw_while, tok::kw_switch)) &&
+      // Don't do this for simple (no expressions) one-argument function calls
+      // as that feels like needlessly wasting whitespace, e.g.:
+      //
+      //   caaaaaaaaaaaall(
+      //       caaaaaaaaaaaall(
+      //           caaaaaaaaaaaall(
+      //               caaaaaaaaaaaaaaaaaaaaaaall(aaaaaaaaaaaaaa, aaaaaaaaa))));
+      Current.FakeLParens.size() > 0 &&
+      Current.FakeLParens.back() > prec::Unknown)
+    State.Stack.back().NoLineBreak = true;
+  if (Previous.is(TT_TemplateString) && Previous.opensScope())
+    State.Stack.back().NoLineBreak = true;
+
+  if (Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign &&
+      Previous.opensScope() && Previous.isNot(TT_ObjCMethodExpr) &&
+      (Current.isNot(TT_LineComment) || Previous.BlockKind == BK_BracedInit))
+    State.Stack.back().Indent = State.Column + Spaces;
+  if (State.Stack.back().AvoidBinPacking && startsNextParameter(Current, Style))
+    State.Stack.back().NoLineBreak = true;
+  if (startsSegmentOfBuilderTypeCall(Current) &&
+      State.Column > getNewLineColumn(State))
+    State.Stack.back().ContainsUnwrappedBuilder = true;
+
+  if (Current.is(TT_LambdaArrow) && Style.Language == FormatStyle::LK_Java)
+    State.Stack.back().NoLineBreak = true;
+  if (Current.isMemberAccess() && Previous.is(tok::r_paren) &&
+      (Previous.MatchingParen &&
+       (Previous.TotalLength - Previous.MatchingParen->TotalLength > 10)))
+    // If there is a function call with long parameters, break before trailing
+    // calls. This prevents things like:
+    //   EXPECT_CALL(SomeLongParameter).Times(
+    //       2);
+    // We don't want to do this for short parameters as they can just be
+    // indexes.
+    State.Stack.back().NoLineBreak = true;
+
+  // Don't allow the RHS of an operator to be split over multiple lines unless
+  // there is a line-break right after the operator.
+  // Exclude relational operators, as there, it is always more desirable to
+  // have the LHS 'left' of the RHS.
+  const FormatToken *P = Current.getPreviousNonComment();
+  if (!Current.is(tok::comment) && P &&
+      (P->isOneOf(TT_BinaryOperator, tok::comma) ||
+       (P->is(TT_ConditionalExpr) && P->is(tok::colon))) &&
+      !P->isOneOf(TT_OverloadedOperator, TT_CtorInitializerComma) &&
+      P->getPrecedence() != prec::Assignment &&
+      P->getPrecedence() != prec::Relational &&
+      P->getPrecedence() != prec::Spaceship) {
+    bool BreakBeforeOperator =
+        P->MustBreakBefore || P->is(tok::lessless) ||
+        (P->is(TT_BinaryOperator) &&
+         Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None) ||
+        (P->is(TT_ConditionalExpr) && Style.BreakBeforeTernaryOperators);
+    // Don't do this if there are only two operands. In these cases, there is
+    // always a nice vertical separation between them and the extra line break
+    // does not help.
+    bool HasTwoOperands =
+        P->OperatorIndex == 0 && !P->NextOperator && !P->is(TT_ConditionalExpr);
+    if ((!BreakBeforeOperator && !(HasTwoOperands && Style.AlignOperands)) ||
+        (!State.Stack.back().LastOperatorWrapped && BreakBeforeOperator))
+      State.Stack.back().NoLineBreakInOperand = true;
+  }
+
+  State.Column += Spaces;
+  if (Current.isNot(tok::comment) && Previous.is(tok::l_paren) &&
+      Previous.Previous &&
+      (Previous.Previous->isOneOf(tok::kw_if, tok::kw_for) ||
+       Previous.Previous->endsSequence(tok::kw_constexpr, tok::kw_if))) {
+    // Treat the condition inside an if as if it was a second function
+    // parameter, i.e. let nested calls have a continuation indent.
+    State.Stack.back().LastSpace = State.Column;
+    State.Stack.back().NestedBlockIndent = State.Column;
+  } else if (!Current.isOneOf(tok::comment, tok::caret) &&
+             ((Previous.is(tok::comma) &&
+               !Previous.is(TT_OverloadedOperator)) ||
+              (Previous.is(tok::colon) && Previous.is(TT_ObjCMethodExpr)))) {
+    State.Stack.back().LastSpace = State.Column;
+  } else if (Previous.is(TT_CtorInitializerColon) &&
+             Style.BreakConstructorInitializers ==
+                 FormatStyle::BCIS_AfterColon) {
+    State.Stack.back().Indent = State.Column;
+    State.Stack.back().LastSpace = State.Column;
+  } else if ((Previous.isOneOf(TT_BinaryOperator, TT_ConditionalExpr,
+                               TT_CtorInitializerColon)) &&
+             ((Previous.getPrecedence() != prec::Assignment &&
+               (Previous.isNot(tok::lessless) || Previous.OperatorIndex != 0 ||
+                Previous.NextOperator)) ||
+              Current.StartsBinaryExpression)) {
+    // Indent relative to the RHS of the expression unless this is a simple
+    // assignment without binary expression on the RHS. Also indent relative to
+    // unary operators and the colons of constructor initializers.
+    if (Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None)
+      State.Stack.back().LastSpace = State.Column;
+  } else if (Previous.is(TT_InheritanceColon)) {
+    State.Stack.back().Indent = State.Column;
+    State.Stack.back().LastSpace = State.Column;
+  } else if (Previous.opensScope()) {
+    // If a function has a trailing call, indent all parameters from the
+    // opening parenthesis. This avoids confusing indents like:
+    //   OuterFunction(InnerFunctionCall( // break
+    //       ParameterToInnerFunction))   // break
+    //       .SecondInnerFunctionCall();
+    bool HasTrailingCall = false;
+    if (Previous.MatchingParen) {
+      const FormatToken *Next = Previous.MatchingParen->getNextNonComment();
+      HasTrailingCall = Next && Next->isMemberAccess();
+    }
+    if (HasTrailingCall && State.Stack.size() > 1 &&
+        State.Stack[State.Stack.size() - 2].CallContinuation == 0)
+      State.Stack.back().LastSpace = State.Column;
+  }
+}
+
+unsigned ContinuationIndenter::addTokenOnNewLine(LineState &State,
+                                                 bool DryRun) {
+  FormatToken &Current = *State.NextToken;
+  const FormatToken &Previous = *State.NextToken->Previous;
+
+  // Extra penalty that needs to be added because of the way certain line
+  // breaks are chosen.
+  unsigned Penalty = 0;
+
+  const FormatToken *PreviousNonComment = Current.getPreviousNonComment();
+  const FormatToken *NextNonComment = Previous.getNextNonComment();
+  if (!NextNonComment)
+    NextNonComment = &Current;
+  // The first line break on any NestingLevel causes an extra penalty in order
+  // prefer similar line breaks.
+  if (!State.Stack.back().ContainsLineBreak)
+    Penalty += 15;
+  State.Stack.back().ContainsLineBreak = true;
+
+  Penalty += State.NextToken->SplitPenalty;
+
+  // Breaking before the first "<<" is generally not desirable if the LHS is
+  // short. Also always add the penalty if the LHS is split over multiple lines
+  // to avoid unnecessary line breaks that just work around this penalty.
+  if (NextNonComment->is(tok::lessless) &&
+      State.Stack.back().FirstLessLess == 0 &&
+      (State.Column <= Style.ColumnLimit / 3 ||
+       State.Stack.back().BreakBeforeParameter))
+    Penalty += Style.PenaltyBreakFirstLessLess;
+
+  State.Column = getNewLineColumn(State);
+
+  // Indent nested blocks relative to this column, unless in a very specific
+  // JavaScript special case where:
+  //
+  //   var loooooong_name =
+  //       function() {
+  //     // code
+  //   }
+  //
+  // is common and should be formatted like a free-standing function. The same
+  // goes for wrapping before the lambda return type arrow.
+  if (!Current.is(TT_LambdaArrow) &&
+      (Style.Language != FormatStyle::LK_JavaScript ||
+       Current.NestingLevel != 0 || !PreviousNonComment ||
+       !PreviousNonComment->is(tok::equal) ||
+       !Current.isOneOf(Keywords.kw_async, Keywords.kw_function)))
+    State.Stack.back().NestedBlockIndent = State.Column;
+
+  if (NextNonComment->isMemberAccess()) {
+    if (State.Stack.back().CallContinuation == 0)
+      State.Stack.back().CallContinuation = State.Column;
+  } else if (NextNonComment->is(TT_SelectorName)) {
+    if (!State.Stack.back().ObjCSelectorNameFound) {
+      if (NextNonComment->LongestObjCSelectorName == 0) {
+        State.Stack.back().AlignColons = false;
+      } else {
+        State.Stack.back().ColonPos =
+            (shouldIndentWrappedSelectorName(Style, State.Line->Type)
+                 ? std::max(State.Stack.back().Indent,
+                            State.FirstIndent + Style.ContinuationIndentWidth)
+                 : State.Stack.back().Indent) +
+            std::max(NextNonComment->LongestObjCSelectorName,
+                     NextNonComment->ColumnWidth);
+      }
+    } else if (State.Stack.back().AlignColons &&
+               State.Stack.back().ColonPos <= NextNonComment->ColumnWidth) {
+      State.Stack.back().ColonPos = State.Column + NextNonComment->ColumnWidth;
+    }
+  } else if (PreviousNonComment && PreviousNonComment->is(tok::colon) &&
+             PreviousNonComment->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral)) {
+    // FIXME: This is hacky, find a better way. The problem is that in an ObjC
+    // method expression, the block should be aligned to the line starting it,
+    // e.g.:
+    //   [aaaaaaaaaaaaaaa aaaaaaaaa: \\ break for some reason
+    //                        ^(int *i) {
+    //                            // ...
+    //                        }];
+    // Thus, we set LastSpace of the next higher NestingLevel, to which we move
+    // when we consume all of the "}"'s FakeRParens at the "{".
+    if (State.Stack.size() > 1)
+      State.Stack[State.Stack.size() - 2].LastSpace =
+          std::max(State.Stack.back().LastSpace, State.Stack.back().Indent) +
+          Style.ContinuationIndentWidth;
+  }
+
+  if ((PreviousNonComment &&
+       PreviousNonComment->isOneOf(tok::comma, tok::semi) &&
+       !State.Stack.back().AvoidBinPacking) ||
+      Previous.is(TT_BinaryOperator))
+    State.Stack.back().BreakBeforeParameter = false;
+  if (PreviousNonComment &&
+      PreviousNonComment->isOneOf(TT_TemplateCloser, TT_JavaAnnotation) &&
+      Current.NestingLevel == 0)
+    State.Stack.back().BreakBeforeParameter = false;
+  if (NextNonComment->is(tok::question) ||
+      (PreviousNonComment && PreviousNonComment->is(tok::question)))
+    State.Stack.back().BreakBeforeParameter = true;
+  if (Current.is(TT_BinaryOperator) && Current.CanBreakBefore)
+    State.Stack.back().BreakBeforeParameter = false;
+
+  if (!DryRun) {
+    unsigned MaxEmptyLinesToKeep = Style.MaxEmptyLinesToKeep + 1;
+    if (Current.is(tok::r_brace) && Current.MatchingParen &&
+        // Only strip trailing empty lines for l_braces that have children, i.e.
+        // for function expressions (lambdas, arrows, etc).
+        !Current.MatchingParen->Children.empty()) {
+      // lambdas and arrow functions are expressions, thus their r_brace is not
+      // on its own line, and thus not covered by UnwrappedLineFormatter's logic
+      // about removing empty lines on closing blocks. Special case them here.
+      MaxEmptyLinesToKeep = 1;
+    }
+    unsigned Newlines =
+        std::max(1u, std::min(Current.NewlinesBefore, MaxEmptyLinesToKeep));
+    bool ContinuePPDirective =
+        State.Line->InPPDirective && State.Line->Type != LT_ImportStatement;
+    Whitespaces.replaceWhitespace(Current, Newlines, State.Column, State.Column,
+                                  ContinuePPDirective);
+  }
+
+  if (!Current.isTrailingComment())
+    State.Stack.back().LastSpace = State.Column;
+  if (Current.is(tok::lessless))
+    // If we are breaking before a "<<", we always want to indent relative to
+    // RHS. This is necessary only for "<<", as we special-case it and don't
+    // always indent relative to the RHS.
+    State.Stack.back().LastSpace += 3; // 3 -> width of "<< ".
+
+  State.StartOfLineLevel = Current.NestingLevel;
+  State.LowestLevelOnLine = Current.NestingLevel;
+
+  // Any break on this level means that the parent level has been broken
+  // and we need to avoid bin packing there.
+  bool NestedBlockSpecialCase =
+      !Style.isCpp() && Current.is(tok::r_brace) && State.Stack.size() > 1 &&
+      State.Stack[State.Stack.size() - 2].NestedBlockInlined;
+  if (!NestedBlockSpecialCase)
+    for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i)
+      State.Stack[i].BreakBeforeParameter = true;
+
+  if (PreviousNonComment &&
+      !PreviousNonComment->isOneOf(tok::comma, tok::colon, tok::semi) &&
+      (PreviousNonComment->isNot(TT_TemplateCloser) ||
+       Current.NestingLevel != 0) &&
+      !PreviousNonComment->isOneOf(
+          TT_BinaryOperator, TT_FunctionAnnotationRParen, TT_JavaAnnotation,
+          TT_LeadingJavaAnnotation) &&
+      Current.isNot(TT_BinaryOperator) && !PreviousNonComment->opensScope())
+    State.Stack.back().BreakBeforeParameter = true;
+
+  // If we break after { or the [ of an array initializer, we should also break
+  // before the corresponding } or ].
+  if (PreviousNonComment &&
+      (PreviousNonComment->isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) ||
+       opensProtoMessageField(*PreviousNonComment, Style)))
+    State.Stack.back().BreakBeforeClosingBrace = true;
+
+  if (State.Stack.back().AvoidBinPacking) {
+    // If we are breaking after '(', '{', '<', or this is the break after a ':'
+    // to start a member initializater list in a constructor, this should not
+    // be considered bin packing unless the relevant AllowAll option is false or
+    // this is a dict/object literal.
+    bool PreviousIsBreakingCtorInitializerColon =
+        Previous.is(TT_CtorInitializerColon) &&
+        Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
+    if (!(Previous.isOneOf(tok::l_paren, tok::l_brace, TT_BinaryOperator) ||
+          PreviousIsBreakingCtorInitializerColon) ||
+        (!Style.AllowAllParametersOfDeclarationOnNextLine &&
+         State.Line->MustBeDeclaration) ||
+        (!Style.AllowAllArgumentsOnNextLine &&
+         !State.Line->MustBeDeclaration) ||
+        (!Style.AllowAllConstructorInitializersOnNextLine &&
+         PreviousIsBreakingCtorInitializerColon) ||
+        Previous.is(TT_DictLiteral))
+      State.Stack.back().BreakBeforeParameter = true;
+
+    // If we are breaking after a ':' to start a member initializer list,
+    // and we allow all arguments on the next line, we should not break
+    // before the next parameter.
+    if (PreviousIsBreakingCtorInitializerColon &&
+        Style.AllowAllConstructorInitializersOnNextLine)
+      State.Stack.back().BreakBeforeParameter = false;
+  }
+
+  return Penalty;
+}
+
+unsigned ContinuationIndenter::getNewLineColumn(const LineState &State) {
+  if (!State.NextToken || !State.NextToken->Previous)
+    return 0;
+  FormatToken &Current = *State.NextToken;
+  const FormatToken &Previous = *Current.Previous;
+  // If we are continuing an expression, we want to use the continuation indent.
+  unsigned ContinuationIndent =
+      std::max(State.Stack.back().LastSpace, State.Stack.back().Indent) +
+      Style.ContinuationIndentWidth;
+  const FormatToken *PreviousNonComment = Current.getPreviousNonComment();
+  const FormatToken *NextNonComment = Previous.getNextNonComment();
+  if (!NextNonComment)
+    NextNonComment = &Current;
+
+  // Java specific bits.
+  if (Style.Language == FormatStyle::LK_Java &&
+      Current.isOneOf(Keywords.kw_implements, Keywords.kw_extends))
+    return std::max(State.Stack.back().LastSpace,
+                    State.Stack.back().Indent + Style.ContinuationIndentWidth);
+
+  if (NextNonComment->is(tok::l_brace) && NextNonComment->BlockKind == BK_Block)
+    return Current.NestingLevel == 0 ? State.FirstIndent
+                                     : State.Stack.back().Indent;
+  if ((Current.isOneOf(tok::r_brace, tok::r_square) ||
+       (Current.is(tok::greater) &&
+        (Style.Language == FormatStyle::LK_Proto ||
+         Style.Language == FormatStyle::LK_TextProto))) &&
+      State.Stack.size() > 1) {
+    if (Current.closesBlockOrBlockTypeList(Style))
+      return State.Stack[State.Stack.size() - 2].NestedBlockIndent;
+    if (Current.MatchingParen &&
+        Current.MatchingParen->BlockKind == BK_BracedInit)
+      return State.Stack[State.Stack.size() - 2].LastSpace;
+    return State.FirstIndent;
+  }
+  // Indent a closing parenthesis at the previous level if followed by a semi,
+  // const, or opening brace. This allows indentations such as:
+  //     foo(
+  //       a,
+  //     );
+  //     int Foo::getter(
+  //         //
+  //     ) const {
+  //       return foo;
+  //     }
+  //     function foo(
+  //       a,
+  //     ) {
+  //       code(); //
+  //     }
+  if (Current.is(tok::r_paren) && State.Stack.size() > 1 &&
+      (!Current.Next ||
+       Current.Next->isOneOf(tok::semi, tok::kw_const, tok::l_brace)))
+    return State.Stack[State.Stack.size() - 2].LastSpace;
+  if (NextNonComment->is(TT_TemplateString) && NextNonComment->closesScope())
+    return State.Stack[State.Stack.size() - 2].LastSpace;
+  if (Current.is(tok::identifier) && Current.Next &&
+      (Current.Next->is(TT_DictLiteral) ||
+       ((Style.Language == FormatStyle::LK_Proto ||
+         Style.Language == FormatStyle::LK_TextProto) &&
+        Current.Next->isOneOf(tok::less, tok::l_brace))))
+    return State.Stack.back().Indent;
+  if (NextNonComment->is(TT_ObjCStringLiteral) &&
+      State.StartOfStringLiteral != 0)
+    return State.StartOfStringLiteral - 1;
+  if (NextNonComment->isStringLiteral() && State.StartOfStringLiteral != 0)
+    return State.StartOfStringLiteral;
+  if (NextNonComment->is(tok::lessless) &&
+      State.Stack.back().FirstLessLess != 0)
+    return State.Stack.back().FirstLessLess;
+  if (NextNonComment->isMemberAccess()) {
+    if (State.Stack.back().CallContinuation == 0)
+      return ContinuationIndent;
+    return State.Stack.back().CallContinuation;
+  }
+  if (State.Stack.back().QuestionColumn != 0 &&
+      ((NextNonComment->is(tok::colon) &&
+        NextNonComment->is(TT_ConditionalExpr)) ||
+       Previous.is(TT_ConditionalExpr)))
+    return State.Stack.back().QuestionColumn;
+  if (Previous.is(tok::comma) && State.Stack.back().VariablePos != 0)
+    return State.Stack.back().VariablePos;
+  if ((PreviousNonComment &&
+       (PreviousNonComment->ClosesTemplateDeclaration ||
+        PreviousNonComment->isOneOf(
+            TT_AttributeParen, TT_AttributeSquare, TT_FunctionAnnotationRParen,
+            TT_JavaAnnotation, TT_LeadingJavaAnnotation))) ||
+      (!Style.IndentWrappedFunctionNames &&
+       NextNonComment->isOneOf(tok::kw_operator, TT_FunctionDeclarationName)))
+    return std::max(State.Stack.back().LastSpace, State.Stack.back().Indent);
+  if (NextNonComment->is(TT_SelectorName)) {
+    if (!State.Stack.back().ObjCSelectorNameFound) {
+      unsigned MinIndent = State.Stack.back().Indent;
+      if (shouldIndentWrappedSelectorName(Style, State.Line->Type))
+        MinIndent = std::max(MinIndent,
+                             State.FirstIndent + Style.ContinuationIndentWidth);
+      // If LongestObjCSelectorName is 0, we are indenting the first
+      // part of an ObjC selector (or a selector component which is
+      // not colon-aligned due to block formatting).
+      //
+      // Otherwise, we are indenting a subsequent part of an ObjC
+      // selector which should be colon-aligned to the longest
+      // component of the ObjC selector.
+      //
+      // In either case, we want to respect Style.IndentWrappedFunctionNames.
+      return MinIndent +
+             std::max(NextNonComment->LongestObjCSelectorName,
+                      NextNonComment->ColumnWidth) -
+             NextNonComment->ColumnWidth;
+    }
+    if (!State.Stack.back().AlignColons)
+      return State.Stack.back().Indent;
+    if (State.Stack.back().ColonPos > NextNonComment->ColumnWidth)
+      return State.Stack.back().ColonPos - NextNonComment->ColumnWidth;
+    return State.Stack.back().Indent;
+  }
+  if (NextNonComment->is(tok::colon) && NextNonComment->is(TT_ObjCMethodExpr))
+    return State.Stack.back().ColonPos;
+  if (NextNonComment->is(TT_ArraySubscriptLSquare)) {
+    if (State.Stack.back().StartOfArraySubscripts != 0)
+      return State.Stack.back().StartOfArraySubscripts;
+    return ContinuationIndent;
+  }
+
+  // This ensure that we correctly format ObjC methods calls without inputs,
+  // i.e. where the last element isn't selector like: [callee method];
+  if (NextNonComment->is(tok::identifier) && NextNonComment->FakeRParens == 0 &&
+      NextNonComment->Next && NextNonComment->Next->is(TT_ObjCMethodExpr))
+    return State.Stack.back().Indent;
+
+  if (NextNonComment->isOneOf(TT_StartOfName, TT_PointerOrReference) ||
+      Previous.isOneOf(tok::coloncolon, tok::equal, TT_JsTypeColon))
+    return ContinuationIndent;
+  if (PreviousNonComment && PreviousNonComment->is(tok::colon) &&
+      PreviousNonComment->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral))
+    return ContinuationIndent;
+  if (NextNonComment->is(TT_CtorInitializerComma))
+    return State.Stack.back().Indent;
+  if (PreviousNonComment && PreviousNonComment->is(TT_CtorInitializerColon) &&
+      Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon)
+    return State.Stack.back().Indent;
+  if (PreviousNonComment && PreviousNonComment->is(TT_InheritanceColon) &&
+      Style.BreakInheritanceList == FormatStyle::BILS_AfterColon)
+    return State.Stack.back().Indent;
+  if (NextNonComment->isOneOf(TT_CtorInitializerColon, TT_InheritanceColon,
+                              TT_InheritanceComma))
+    return State.FirstIndent + Style.ConstructorInitializerIndentWidth;
+  if (Previous.is(tok::r_paren) && !Current.isBinaryOperator() &&
+      !Current.isOneOf(tok::colon, tok::comment))
+    return ContinuationIndent;
+  if (Current.is(TT_ProtoExtensionLSquare))
+    return State.Stack.back().Indent;
+  if (State.Stack.back().Indent == State.FirstIndent && PreviousNonComment &&
+      !PreviousNonComment->isOneOf(tok::r_brace, TT_CtorInitializerComma))
+    // Ensure that we fall back to the continuation indent width instead of
+    // just flushing continuations left.
+    return State.Stack.back().Indent + Style.ContinuationIndentWidth;
+  return State.Stack.back().Indent;
+}
+
+unsigned ContinuationIndenter::moveStateToNextToken(LineState &State,
+                                                    bool DryRun, bool Newline) {
+  assert(State.Stack.size());
+  const FormatToken &Current = *State.NextToken;
+
+  if (Current.isOneOf(tok::comma, TT_BinaryOperator))
+    State.Stack.back().NoLineBreakInOperand = false;
+  if (Current.is(TT_InheritanceColon))
+    State.Stack.back().AvoidBinPacking = true;
+  if (Current.is(tok::lessless) && Current.isNot(TT_OverloadedOperator)) {
+    if (State.Stack.back().FirstLessLess == 0)
+      State.Stack.back().FirstLessLess = State.Column;
+    else
+      State.Stack.back().LastOperatorWrapped = Newline;
+  }
+  if (Current.is(TT_BinaryOperator) && Current.isNot(tok::lessless))
+    State.Stack.back().LastOperatorWrapped = Newline;
+  if (Current.is(TT_ConditionalExpr) && Current.Previous &&
+      !Current.Previous->is(TT_ConditionalExpr))
+    State.Stack.back().LastOperatorWrapped = Newline;
+  if (Current.is(TT_ArraySubscriptLSquare) &&
+      State.Stack.back().StartOfArraySubscripts == 0)
+    State.Stack.back().StartOfArraySubscripts = State.Column;
+  if (Style.BreakBeforeTernaryOperators && Current.is(tok::question))
+    State.Stack.back().QuestionColumn = State.Column;
+  if (!Style.BreakBeforeTernaryOperators && Current.isNot(tok::colon)) {
+    const FormatToken *Previous = Current.Previous;
+    while (Previous && Previous->isTrailingComment())
+      Previous = Previous->Previous;
+    if (Previous && Previous->is(tok::question))
+      State.Stack.back().QuestionColumn = State.Column;
+  }
+  if (!Current.opensScope() && !Current.closesScope() &&
+      !Current.is(TT_PointerOrReference))
+    State.LowestLevelOnLine =
+        std::min(State.LowestLevelOnLine, Current.NestingLevel);
+  if (Current.isMemberAccess())
+    State.Stack.back().StartOfFunctionCall =
+        !Current.NextOperator ? 0 : State.Column;
+  if (Current.is(TT_SelectorName))
+    State.Stack.back().ObjCSelectorNameFound = true;
+  if (Current.is(TT_CtorInitializerColon) &&
+      Style.BreakConstructorInitializers != FormatStyle::BCIS_AfterColon) {
+    // Indent 2 from the column, so:
+    // SomeClass::SomeClass()
+    //     : First(...), ...
+    //       Next(...)
+    //       ^ line up here.
+    State.Stack.back().Indent =
+        State.Column +
+        (Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma
+             ? 0
+             : 2);
+    State.Stack.back().NestedBlockIndent = State.Stack.back().Indent;
+    if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine) {
+      State.Stack.back().AvoidBinPacking = true;
+      State.Stack.back().BreakBeforeParameter =
+          !Style.AllowAllConstructorInitializersOnNextLine;
+    } else {
+      State.Stack.back().BreakBeforeParameter = false;
+    }
+  }
+  if (Current.is(TT_CtorInitializerColon) &&
+      Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon) {
+    State.Stack.back().Indent =
+        State.FirstIndent + Style.ConstructorInitializerIndentWidth;
+    State.Stack.back().NestedBlockIndent = State.Stack.back().Indent;
+    if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
+      State.Stack.back().AvoidBinPacking = true;
+  }
+  if (Current.is(TT_InheritanceColon))
+    State.Stack.back().Indent =
+        State.FirstIndent + Style.ConstructorInitializerIndentWidth;
+  if (Current.isOneOf(TT_BinaryOperator, TT_ConditionalExpr) && Newline)
+    State.Stack.back().NestedBlockIndent =
+        State.Column + Current.ColumnWidth + 1;
+  if (Current.isOneOf(TT_LambdaLSquare, TT_LambdaArrow))
+    State.Stack.back().LastSpace = State.Column;
+
+  // Insert scopes created by fake parenthesis.
+  const FormatToken *Previous = Current.getPreviousNonComment();
+
+  // Add special behavior to support a format commonly used for JavaScript
+  // closures:
+  //   SomeFunction(function() {
+  //     foo();
+  //     bar();
+  //   }, a, b, c);
+  if (Current.isNot(tok::comment) && Previous &&
+      Previous->isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) &&
+      !Previous->is(TT_DictLiteral) && State.Stack.size() > 1 &&
+      !State.Stack.back().HasMultipleNestedBlocks) {
+    if (State.Stack[State.Stack.size() - 2].NestedBlockInlined && Newline)
+      for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i)
+        State.Stack[i].NoLineBreak = true;
+    State.Stack[State.Stack.size() - 2].NestedBlockInlined = false;
+  }
+  if (Previous &&
+      (Previous->isOneOf(tok::l_paren, tok::comma, tok::colon) ||
+       Previous->isOneOf(TT_BinaryOperator, TT_ConditionalExpr)) &&
+      !Previous->isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)) {
+    State.Stack.back().NestedBlockInlined =
+        !Newline &&
+        (Previous->isNot(tok::l_paren) || Previous->ParameterCount > 1);
+  }
+
+  moveStatePastFakeLParens(State, Newline);
+  moveStatePastScopeCloser(State);
+  bool AllowBreak = !State.Stack.back().NoLineBreak &&
+                    !State.Stack.back().NoLineBreakInOperand;
+  moveStatePastScopeOpener(State, Newline);
+  moveStatePastFakeRParens(State);
+
+  if (Current.is(TT_ObjCStringLiteral) && State.StartOfStringLiteral == 0)
+    State.StartOfStringLiteral = State.Column + 1;
+  if (Current.is(TT_CSharpStringLiteral) && State.StartOfStringLiteral == 0)
+    State.StartOfStringLiteral = State.Column + 1;
+  else if (Current.isStringLiteral() && State.StartOfStringLiteral == 0)
+    State.StartOfStringLiteral = State.Column;
+  else if (!Current.isOneOf(tok::comment, tok::identifier, tok::hash) &&
+           !Current.isStringLiteral())
+    State.StartOfStringLiteral = 0;
+
+  State.Column += Current.ColumnWidth;
+  State.NextToken = State.NextToken->Next;
+
+  unsigned Penalty =
+      handleEndOfLine(Current, State, DryRun, AllowBreak, Newline);
+
+  if (Current.Role)
+    Current.Role->formatFromToken(State, this, DryRun);
+  // If the previous has a special role, let it consume tokens as appropriate.
+  // It is necessary to start at the previous token for the only implemented
+  // role (comma separated list). That way, the decision whether or not to break
+  // after the "{" is already done and both options are tried and evaluated.
+  // FIXME: This is ugly, find a better way.
+  if (Previous && Previous->Role)
+    Penalty += Previous->Role->formatAfterToken(State, this, DryRun);
+
+  return Penalty;
+}
+
+void ContinuationIndenter::moveStatePastFakeLParens(LineState &State,
+                                                    bool Newline) {
+  const FormatToken &Current = *State.NextToken;
+  const FormatToken *Previous = Current.getPreviousNonComment();
+
+  // Don't add extra indentation for the first fake parenthesis after
+  // 'return', assignments or opening <({[. The indentation for these cases
+  // is special cased.
+  bool SkipFirstExtraIndent =
+      (Previous && (Previous->opensScope() ||
+                    Previous->isOneOf(tok::semi, tok::kw_return) ||
+                    (Previous->getPrecedence() == prec::Assignment &&
+                     Style.AlignOperands) ||
+                    Previous->is(TT_ObjCMethodExpr)));
+  for (SmallVectorImpl<prec::Level>::const_reverse_iterator
+           I = Current.FakeLParens.rbegin(),
+           E = Current.FakeLParens.rend();
+       I != E; ++I) {
+    ParenState NewParenState = State.Stack.back();
+    NewParenState.Tok = nullptr;
+    NewParenState.ContainsLineBreak = false;
+    NewParenState.LastOperatorWrapped = true;
+    NewParenState.NoLineBreak =
+        NewParenState.NoLineBreak || State.Stack.back().NoLineBreakInOperand;
+
+    // Don't propagate AvoidBinPacking into subexpressions of arg/param lists.
+    if (*I > prec::Comma)
+      NewParenState.AvoidBinPacking = false;
+
+    // Indent from 'LastSpace' unless these are fake parentheses encapsulating
+    // a builder type call after 'return' or, if the alignment after opening
+    // brackets is disabled.
+    if (!Current.isTrailingComment() &&
+        (Style.AlignOperands || *I < prec::Assignment) &&
+        (!Previous || Previous->isNot(tok::kw_return) ||
+         (Style.Language != FormatStyle::LK_Java && *I > 0)) &&
+        (Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign ||
+         *I != prec::Comma || Current.NestingLevel == 0))
+      NewParenState.Indent =
+          std::max(std::max(State.Column, NewParenState.Indent),
+                   State.Stack.back().LastSpace);
+
+    // Do not indent relative to the fake parentheses inserted for "." or "->".
+    // This is a special case to make the following to statements consistent:
+    //   OuterFunction(InnerFunctionCall( // break
+    //       ParameterToInnerFunction));
+    //   OuterFunction(SomeObject.InnerFunctionCall( // break
+    //       ParameterToInnerFunction));
+    if (*I > prec::Unknown)
+      NewParenState.LastSpace = std::max(NewParenState.LastSpace, State.Column);
+    if (*I != prec::Conditional && !Current.is(TT_UnaryOperator) &&
+        Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign)
+      NewParenState.StartOfFunctionCall = State.Column;
+
+    // Always indent conditional expressions. Never indent expression where
+    // the 'operator' is ',', ';' or an assignment (i.e. *I <=
+    // prec::Assignment) as those have different indentation rules. Indent
+    // other expression, unless the indentation needs to be skipped.
+    if (*I == prec::Conditional ||
+        (!SkipFirstExtraIndent && *I > prec::Assignment &&
+         !Current.isTrailingComment()))
+      NewParenState.Indent += Style.ContinuationIndentWidth;
+    if ((Previous && !Previous->opensScope()) || *I != prec::Comma)
+      NewParenState.BreakBeforeParameter = false;
+    State.Stack.push_back(NewParenState);
+    SkipFirstExtraIndent = false;
+  }
+}
+
+void ContinuationIndenter::moveStatePastFakeRParens(LineState &State) {
+  for (unsigned i = 0, e = State.NextToken->FakeRParens; i != e; ++i) {
+    unsigned VariablePos = State.Stack.back().VariablePos;
+    if (State.Stack.size() == 1) {
+      // Do not pop the last element.
+      break;
+    }
+    State.Stack.pop_back();
+    State.Stack.back().VariablePos = VariablePos;
+  }
+}
+
+void ContinuationIndenter::moveStatePastScopeOpener(LineState &State,
+                                                    bool Newline) {
+  const FormatToken &Current = *State.NextToken;
+  if (!Current.opensScope())
+    return;
+
+  if (Current.MatchingParen && Current.BlockKind == BK_Block) {
+    moveStateToNewBlock(State);
+    return;
+  }
+
+  unsigned NewIndent;
+  unsigned LastSpace = State.Stack.back().LastSpace;
+  bool AvoidBinPacking;
+  bool BreakBeforeParameter = false;
+  unsigned NestedBlockIndent = std::max(State.Stack.back().StartOfFunctionCall,
+                                        State.Stack.back().NestedBlockIndent);
+  if (Current.isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) ||
+      opensProtoMessageField(Current, Style)) {
+    if (Current.opensBlockOrBlockTypeList(Style)) {
+      NewIndent = Style.IndentWidth +
+                  std::min(State.Column, State.Stack.back().NestedBlockIndent);
+    } else {
+      NewIndent = State.Stack.back().LastSpace + Style.ContinuationIndentWidth;
+    }
+    const FormatToken *NextNoComment = Current.getNextNonComment();
+    bool EndsInComma = Current.MatchingParen &&
+                       Current.MatchingParen->Previous &&
+                       Current.MatchingParen->Previous->is(tok::comma);
+    AvoidBinPacking = EndsInComma || Current.is(TT_DictLiteral) ||
+                      Style.Language == FormatStyle::LK_Proto ||
+                      Style.Language == FormatStyle::LK_TextProto ||
+                      !Style.BinPackArguments ||
+                      (NextNoComment &&
+                       NextNoComment->isOneOf(TT_DesignatedInitializerPeriod,
+                                              TT_DesignatedInitializerLSquare));
+    BreakBeforeParameter = EndsInComma;
+    if (Current.ParameterCount > 1)
+      NestedBlockIndent = std::max(NestedBlockIndent, State.Column + 1);
+  } else {
+    NewIndent = Style.ContinuationIndentWidth +
+                std::max(State.Stack.back().LastSpace,
+                         State.Stack.back().StartOfFunctionCall);
+
+    // Ensure that different different brackets force relative alignment, e.g.:
+    // void SomeFunction(vector<  // break
+    //                       int> v);
+    // FIXME: We likely want to do this for more combinations of brackets.
+    if (Current.is(tok::less) && Current.ParentBracket == tok::l_paren) {
+      NewIndent = std::max(NewIndent, State.Stack.back().Indent);
+      LastSpace = std::max(LastSpace, State.Stack.back().Indent);
+    }
+
+    bool EndsInComma =
+        Current.MatchingParen &&
+        Current.MatchingParen->getPreviousNonComment() &&
+        Current.MatchingParen->getPreviousNonComment()->is(tok::comma);
+
+    // If ObjCBinPackProtocolList is unspecified, fall back to BinPackParameters
+    // for backwards compatibility.
+    bool ObjCBinPackProtocolList =
+        (Style.ObjCBinPackProtocolList == FormatStyle::BPS_Auto &&
+         Style.BinPackParameters) ||
+        Style.ObjCBinPackProtocolList == FormatStyle::BPS_Always;
+
+    bool BinPackDeclaration =
+        (State.Line->Type != LT_ObjCDecl && Style.BinPackParameters) ||
+        (State.Line->Type == LT_ObjCDecl && ObjCBinPackProtocolList);
+
+    AvoidBinPacking =
+        (Style.Language == FormatStyle::LK_JavaScript && EndsInComma) ||
+        (State.Line->MustBeDeclaration && !BinPackDeclaration) ||
+        (!State.Line->MustBeDeclaration && !Style.BinPackArguments) ||
+        (Style.ExperimentalAutoDetectBinPacking &&
+         (Current.PackingKind == PPK_OnePerLine ||
+          (!BinPackInconclusiveFunctions &&
+           Current.PackingKind == PPK_Inconclusive)));
+
+    if (Current.is(TT_ObjCMethodExpr) && Current.MatchingParen) {
+      if (Style.ColumnLimit) {
+        // If this '[' opens an ObjC call, determine whether all parameters fit
+        // into one line and put one per line if they don't.
+        if (getLengthToMatchingParen(Current, State.Stack) + State.Column >
+            getColumnLimit(State))
+          BreakBeforeParameter = true;
+      } else {
+        // For ColumnLimit = 0, we have to figure out whether there is or has to
+        // be a line break within this call.
+        for (const FormatToken *Tok = &Current;
+             Tok && Tok != Current.MatchingParen; Tok = Tok->Next) {
+          if (Tok->MustBreakBefore ||
+              (Tok->CanBreakBefore && Tok->NewlinesBefore > 0)) {
+            BreakBeforeParameter = true;
+            break;
+          }
+        }
+      }
+    }
+
+    if (Style.Language == FormatStyle::LK_JavaScript && EndsInComma)
+      BreakBeforeParameter = true;
+  }
+  // Generally inherit NoLineBreak from the current scope to nested scope.
+  // However, don't do this for non-empty nested blocks, dict literals and
+  // array literals as these follow different indentation rules.
+  bool NoLineBreak =
+      Current.Children.empty() &&
+      !Current.isOneOf(TT_DictLiteral, TT_ArrayInitializerLSquare) &&
+      (State.Stack.back().NoLineBreak ||
+       State.Stack.back().NoLineBreakInOperand ||
+       (Current.is(TT_TemplateOpener) &&
+        State.Stack.back().ContainsUnwrappedBuilder));
+  State.Stack.push_back(
+      ParenState(&Current, NewIndent, LastSpace, AvoidBinPacking, NoLineBreak));
+  State.Stack.back().NestedBlockIndent = NestedBlockIndent;
+  State.Stack.back().BreakBeforeParameter = BreakBeforeParameter;
+  State.Stack.back().HasMultipleNestedBlocks = Current.BlockParameterCount > 1;
+  State.Stack.back().IsInsideObjCArrayLiteral =
+      Current.is(TT_ArrayInitializerLSquare) && Current.Previous &&
+      Current.Previous->is(tok::at);
+}
+
+void ContinuationIndenter::moveStatePastScopeCloser(LineState &State) {
+  const FormatToken &Current = *State.NextToken;
+  if (!Current.closesScope())
+    return;
+
+  // If we encounter a closing ), ], } or >, we can remove a level from our
+  // stacks.
+  if (State.Stack.size() > 1 &&
+      (Current.isOneOf(tok::r_paren, tok::r_square, TT_TemplateString) ||
+       (Current.is(tok::r_brace) && State.NextToken != State.Line->First) ||
+       State.NextToken->is(TT_TemplateCloser) ||
+       (Current.is(tok::greater) && Current.is(TT_DictLiteral))))
+    State.Stack.pop_back();
+
+  // Reevaluate whether ObjC message arguments fit into one line.
+  // If a receiver spans multiple lines, e.g.:
+  //   [[object block:^{
+  //     return 42;
+  //   }] a:42 b:42];
+  // BreakBeforeParameter is calculated based on an incorrect assumption
+  // (it is checked whether the whole expression fits into one line without
+  // considering a line break inside a message receiver).
+  // We check whether arguements fit after receiver scope closer (into the same
+  // line).
+  if (State.Stack.back().BreakBeforeParameter && Current.MatchingParen &&
+      Current.MatchingParen->Previous) {
+    const FormatToken &CurrentScopeOpener = *Current.MatchingParen->Previous;
+    if (CurrentScopeOpener.is(TT_ObjCMethodExpr) &&
+        CurrentScopeOpener.MatchingParen) {
+      int NecessarySpaceInLine =
+          getLengthToMatchingParen(CurrentScopeOpener, State.Stack) +
+          CurrentScopeOpener.TotalLength - Current.TotalLength - 1;
+      if (State.Column + Current.ColumnWidth + NecessarySpaceInLine <=
+          Style.ColumnLimit)
+        State.Stack.back().BreakBeforeParameter = false;
+    }
+  }
+
+  if (Current.is(tok::r_square)) {
+    // If this ends the array subscript expr, reset the corresponding value.
+    const FormatToken *NextNonComment = Current.getNextNonComment();
+    if (NextNonComment && NextNonComment->isNot(tok::l_square))
+      State.Stack.back().StartOfArraySubscripts = 0;
+  }
+}
+
+void ContinuationIndenter::moveStateToNewBlock(LineState &State) {
+  unsigned NestedBlockIndent = State.Stack.back().NestedBlockIndent;
+  // ObjC block sometimes follow special indentation rules.
+  unsigned NewIndent =
+      NestedBlockIndent + (State.NextToken->is(TT_ObjCBlockLBrace)
+                               ? Style.ObjCBlockIndentWidth
+                               : Style.IndentWidth);
+  State.Stack.push_back(ParenState(State.NextToken, NewIndent,
+                                   State.Stack.back().LastSpace,
+                                   /*AvoidBinPacking=*/true,
+                                   /*NoLineBreak=*/false));
+  State.Stack.back().NestedBlockIndent = NestedBlockIndent;
+  State.Stack.back().BreakBeforeParameter = true;
+}
+
+static unsigned getLastLineEndColumn(StringRef Text, unsigned StartColumn,
+                                     unsigned TabWidth,
+                                     encoding::Encoding Encoding) {
+  size_t LastNewlinePos = Text.find_last_of("\n");
+  if (LastNewlinePos == StringRef::npos) {
+    return StartColumn +
+           encoding::columnWidthWithTabs(Text, StartColumn, TabWidth, Encoding);
+  } else {
+    return encoding::columnWidthWithTabs(Text.substr(LastNewlinePos),
+                                         /*StartColumn=*/0, TabWidth, Encoding);
+  }
+}
+
+unsigned ContinuationIndenter::reformatRawStringLiteral(
+    const FormatToken &Current, LineState &State,
+    const FormatStyle &RawStringStyle, bool DryRun, bool Newline) {
+  unsigned StartColumn = State.Column - Current.ColumnWidth;
+  StringRef OldDelimiter = *getRawStringDelimiter(Current.TokenText);
+  StringRef NewDelimiter =
+      getCanonicalRawStringDelimiter(Style, RawStringStyle.Language);
+  if (NewDelimiter.empty() || OldDelimiter.empty())
+    NewDelimiter = OldDelimiter;
+  // The text of a raw string is between the leading 'R"delimiter(' and the
+  // trailing 'delimiter)"'.
+  unsigned OldPrefixSize = 3 + OldDelimiter.size();
+  unsigned OldSuffixSize = 2 + OldDelimiter.size();
+  // We create a virtual text environment which expects a null-terminated
+  // string, so we cannot use StringRef.
+  std::string RawText =
+      Current.TokenText.substr(OldPrefixSize).drop_back(OldSuffixSize);
+  if (NewDelimiter != OldDelimiter) {
+    // Don't update to the canonical delimiter 'deli' if ')deli"' occurs in the
+    // raw string.
+    std::string CanonicalDelimiterSuffix = (")" + NewDelimiter + "\"").str();
+    if (StringRef(RawText).contains(CanonicalDelimiterSuffix))
+      NewDelimiter = OldDelimiter;
+  }
+
+  unsigned NewPrefixSize = 3 + NewDelimiter.size();
+  unsigned NewSuffixSize = 2 + NewDelimiter.size();
+
+  // The first start column is the column the raw text starts after formatting.
+  unsigned FirstStartColumn = StartColumn + NewPrefixSize;
+
+  // The next start column is the intended indentation a line break inside
+  // the raw string at level 0. It is determined by the following rules:
+  //   - if the content starts on newline, it is one level more than the current
+  //     indent, and
+  //   - if the content does not start on a newline, it is the first start
+  //     column.
+  // These rules have the advantage that the formatted content both does not
+  // violate the rectangle rule and visually flows within the surrounding
+  // source.
+  bool ContentStartsOnNewline = Current.TokenText[OldPrefixSize] == '\n';
+  // If this token is the last parameter (checked by looking if it's followed by
+  // `)` and is not on a newline, the base the indent off the line's nested
+  // block indent. Otherwise, base the indent off the arguments indent, so we
+  // can achieve:
+  //
+  // fffffffffff(1, 2, 3, R"pb(
+  //     key1: 1  #
+  //     key2: 2)pb");
+  //
+  // fffffffffff(1, 2, 3,
+  //             R"pb(
+  //               key1: 1  #
+  //               key2: 2
+  //             )pb");
+  //
+  // fffffffffff(1, 2, 3,
+  //             R"pb(
+  //               key1: 1  #
+  //               key2: 2
+  //             )pb",
+  //             5);
+  unsigned CurrentIndent =
+      (!Newline && Current.Next && Current.Next->is(tok::r_paren))
+          ? State.Stack.back().NestedBlockIndent
+          : State.Stack.back().Indent;
+  unsigned NextStartColumn = ContentStartsOnNewline
+                                 ? CurrentIndent + Style.IndentWidth
+                                 : FirstStartColumn;
+
+  // The last start column is the column the raw string suffix starts if it is
+  // put on a newline.
+  // The last start column is the intended indentation of the raw string postfix
+  // if it is put on a newline. It is determined by the following rules:
+  //   - if the raw string prefix starts on a newline, it is the column where
+  //     that raw string prefix starts, and
+  //   - if the raw string prefix does not start on a newline, it is the current
+  //     indent.
+  unsigned LastStartColumn =
+      Current.NewlinesBefore ? FirstStartColumn - NewPrefixSize : CurrentIndent;
+
+  std::pair<tooling::Replacements, unsigned> Fixes = internal::reformat(
+      RawStringStyle, RawText, {tooling::Range(0, RawText.size())},
+      FirstStartColumn, NextStartColumn, LastStartColumn, "<stdin>",
+      /*Status=*/nullptr);
+
+  auto NewCode = applyAllReplacements(RawText, Fixes.first);
+  tooling::Replacements NoFixes;
+  if (!NewCode) {
+    return addMultilineToken(Current, State);
+  }
+  if (!DryRun) {
+    if (NewDelimiter != OldDelimiter) {
+      // In 'R"delimiter(...', the delimiter starts 2 characters after the start
+      // of the token.
+      SourceLocation PrefixDelimiterStart =
+          Current.Tok.getLocation().getLocWithOffset(2);
+      auto PrefixErr = Whitespaces.addReplacement(tooling::Replacement(
+          SourceMgr, PrefixDelimiterStart, OldDelimiter.size(), NewDelimiter));
+      if (PrefixErr) {
+        llvm::errs()
+            << "Failed to update the prefix delimiter of a raw string: "
+            << llvm::toString(std::move(PrefixErr)) << "\n";
+      }
+      // In 'R"delimiter(...)delimiter"', the suffix delimiter starts at
+      // position length - 1 - |delimiter|.
+      SourceLocation SuffixDelimiterStart =
+          Current.Tok.getLocation().getLocWithOffset(Current.TokenText.size() -
+                                                     1 - OldDelimiter.size());
+      auto SuffixErr = Whitespaces.addReplacement(tooling::Replacement(
+          SourceMgr, SuffixDelimiterStart, OldDelimiter.size(), NewDelimiter));
+      if (SuffixErr) {
+        llvm::errs()
+            << "Failed to update the suffix delimiter of a raw string: "
+            << llvm::toString(std::move(SuffixErr)) << "\n";
+      }
+    }
+    SourceLocation OriginLoc =
+        Current.Tok.getLocation().getLocWithOffset(OldPrefixSize);
+    for (const tooling::Replacement &Fix : Fixes.first) {
+      auto Err = Whitespaces.addReplacement(tooling::Replacement(
+          SourceMgr, OriginLoc.getLocWithOffset(Fix.getOffset()),
+          Fix.getLength(), Fix.getReplacementText()));
+      if (Err) {
+        llvm::errs() << "Failed to reformat raw string: "
+                     << llvm::toString(std::move(Err)) << "\n";
+      }
+    }
+  }
+  unsigned RawLastLineEndColumn = getLastLineEndColumn(
+      *NewCode, FirstStartColumn, Style.TabWidth, Encoding);
+  State.Column = RawLastLineEndColumn + NewSuffixSize;
+  // Since we're updating the column to after the raw string literal here, we
+  // have to manually add the penalty for the prefix R"delim( over the column
+  // limit.
+  unsigned PrefixExcessCharacters =
+      StartColumn + NewPrefixSize > Style.ColumnLimit
+          ? StartColumn + NewPrefixSize - Style.ColumnLimit
+          : 0;
+  bool IsMultiline =
+      ContentStartsOnNewline || (NewCode->find('\n') != std::string::npos);
+  if (IsMultiline) {
+    // Break before further function parameters on all levels.
+    for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
+      State.Stack[i].BreakBeforeParameter = true;
+  }
+  return Fixes.second + PrefixExcessCharacters * Style.PenaltyExcessCharacter;
+}
+
+unsigned ContinuationIndenter::addMultilineToken(const FormatToken &Current,
+                                                 LineState &State) {
+  // Break before further function parameters on all levels.
+  for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
+    State.Stack[i].BreakBeforeParameter = true;
+
+  unsigned ColumnsUsed = State.Column;
+  // We can only affect layout of the first and the last line, so the penalty
+  // for all other lines is constant, and we ignore it.
+  State.Column = Current.LastLineColumnWidth;
+
+  if (ColumnsUsed > getColumnLimit(State))
+    return Style.PenaltyExcessCharacter * (ColumnsUsed - getColumnLimit(State));
+  return 0;
+}
+
+unsigned ContinuationIndenter::handleEndOfLine(const FormatToken &Current,
+                                               LineState &State, bool DryRun,
+                                               bool AllowBreak, bool Newline) {
+  unsigned Penalty = 0;
+  // Compute the raw string style to use in case this is a raw string literal
+  // that can be reformatted.
+  auto RawStringStyle = getRawStringStyle(Current, State);
+  if (RawStringStyle && !Current.Finalized) {
+    Penalty = reformatRawStringLiteral(Current, State, *RawStringStyle, DryRun,
+                                       Newline);
+  } else if (Current.IsMultiline && Current.isNot(TT_BlockComment)) {
+    // Don't break multi-line tokens other than block comments and raw string
+    // literals. Instead, just update the state.
+    Penalty = addMultilineToken(Current, State);
+  } else if (State.Line->Type != LT_ImportStatement) {
+    // We generally don't break import statements.
+    LineState OriginalState = State;
+
+    // Whether we force the reflowing algorithm to stay strictly within the
+    // column limit.
+    bool Strict = false;
+    // Whether the first non-strict attempt at reflowing did intentionally
+    // exceed the column limit.
+    bool Exceeded = false;
+    std::tie(Penalty, Exceeded) = breakProtrudingToken(
+        Current, State, AllowBreak, /*DryRun=*/true, Strict);
+    if (Exceeded) {
+      // If non-strict reflowing exceeds the column limit, try whether strict
+      // reflowing leads to an overall lower penalty.
+      LineState StrictState = OriginalState;
+      unsigned StrictPenalty =
+          breakProtrudingToken(Current, StrictState, AllowBreak,
+                               /*DryRun=*/true, /*Strict=*/true)
+              .first;
+      Strict = StrictPenalty <= Penalty;
+      if (Strict) {
+        Penalty = StrictPenalty;
+        State = StrictState;
+      }
+    }
+    if (!DryRun) {
+      // If we're not in dry-run mode, apply the changes with the decision on
+      // strictness made above.
+      breakProtrudingToken(Current, OriginalState, AllowBreak, /*DryRun=*/false,
+                           Strict);
+    }
+  }
+  if (State.Column > getColumnLimit(State)) {
+    unsigned ExcessCharacters = State.Column - getColumnLimit(State);
+    Penalty += Style.PenaltyExcessCharacter * ExcessCharacters;
+  }
+  return Penalty;
+}
+
+// Returns the enclosing function name of a token, or the empty string if not
+// found.
+static StringRef getEnclosingFunctionName(const FormatToken &Current) {
+  // Look for: 'function(' or 'function<templates>(' before Current.
+  auto Tok = Current.getPreviousNonComment();
+  if (!Tok || !Tok->is(tok::l_paren))
+    return "";
+  Tok = Tok->getPreviousNonComment();
+  if (!Tok)
+    return "";
+  if (Tok->is(TT_TemplateCloser)) {
+    Tok = Tok->MatchingParen;
+    if (Tok)
+      Tok = Tok->getPreviousNonComment();
+  }
+  if (!Tok || !Tok->is(tok::identifier))
+    return "";
+  return Tok->TokenText;
+}
+
+llvm::Optional<FormatStyle>
+ContinuationIndenter::getRawStringStyle(const FormatToken &Current,
+                                        const LineState &State) {
+  if (!Current.isStringLiteral())
+    return None;
+  auto Delimiter = getRawStringDelimiter(Current.TokenText);
+  if (!Delimiter)
+    return None;
+  auto RawStringStyle = RawStringFormats.getDelimiterStyle(*Delimiter);
+  if (!RawStringStyle && Delimiter->empty())
+    RawStringStyle = RawStringFormats.getEnclosingFunctionStyle(
+        getEnclosingFunctionName(Current));
+  if (!RawStringStyle)
+    return None;
+  RawStringStyle->ColumnLimit = getColumnLimit(State);
+  return RawStringStyle;
+}
+
+std::unique_ptr<BreakableToken>
+ContinuationIndenter::createBreakableToken(const FormatToken &Current,
+                                           LineState &State, bool AllowBreak) {
+  unsigned StartColumn = State.Column - Current.ColumnWidth;
+  if (Current.isStringLiteral()) {
+    // FIXME: String literal breaking is currently disabled for C#,Java and
+    // JavaScript, as it requires strings to be merged using "+" which we
+    // don't support.
+    if (Style.Language == FormatStyle::LK_Java ||
+        Style.Language == FormatStyle::LK_JavaScript || Style.isCSharp() ||
+        !Style.BreakStringLiterals || !AllowBreak)
+      return nullptr;
+
+    // Don't break string literals inside preprocessor directives (except for
+    // #define directives, as their contents are stored in separate lines and
+    // are not affected by this check).
+    // This way we avoid breaking code with line directives and unknown
+    // preprocessor directives that contain long string literals.
+    if (State.Line->Type == LT_PreprocessorDirective)
+      return nullptr;
+    // Exempts unterminated string literals from line breaking. The user will
+    // likely want to terminate the string before any line breaking is done.
+    if (Current.IsUnterminatedLiteral)
+      return nullptr;
+    // Don't break string literals inside Objective-C array literals (doing so
+    // raises the warning -Wobjc-string-concatenation).
+    if (State.Stack.back().IsInsideObjCArrayLiteral) {
+      return nullptr;
+    }
+
+    StringRef Text = Current.TokenText;
+    StringRef Prefix;
+    StringRef Postfix;
+    // FIXME: Handle whitespace between '_T', '(', '"..."', and ')'.
+    // FIXME: Store Prefix and Suffix (or PrefixLength and SuffixLength to
+    // reduce the overhead) for each FormatToken, which is a string, so that we
+    // don't run multiple checks here on the hot path.
+    if ((Text.endswith(Postfix = "\"") &&
+         (Text.startswith(Prefix = "@\"") || Text.startswith(Prefix = "\"") ||
+          Text.startswith(Prefix = "u\"") || Text.startswith(Prefix = "U\"") ||
+          Text.startswith(Prefix = "u8\"") ||
+          Text.startswith(Prefix = "L\""))) ||
+        (Text.startswith(Prefix = "_T(\"") && Text.endswith(Postfix = "\")"))) {
+      // We need this to address the case where there is an unbreakable tail
+      // only if certain other formatting decisions have been taken. The
+      // UnbreakableTailLength of Current is an overapproximation is that case
+      // and we need to be correct here.
+      unsigned UnbreakableTailLength = (State.NextToken && canBreak(State))
+                                           ? 0
+                                           : Current.UnbreakableTailLength;
+      return llvm::make_unique<BreakableStringLiteral>(
+          Current, StartColumn, Prefix, Postfix, UnbreakableTailLength,
+          State.Line->InPPDirective, Encoding, Style);
+    }
+  } else if (Current.is(TT_BlockComment)) {
+    if (!Style.ReflowComments ||
+        // If a comment token switches formatting, like
+        // /* clang-format on */, we don't want to break it further,
+        // but we may still want to adjust its indentation.
+        switchesFormatting(Current)) {
+      return nullptr;
+    }
+    return llvm::make_unique<BreakableBlockComment>(
+        Current, StartColumn, Current.OriginalColumn, !Current.Previous,
+        State.Line->InPPDirective, Encoding, Style, Whitespaces.useCRLF());
+  } else if (Current.is(TT_LineComment) &&
+             (Current.Previous == nullptr ||
+              Current.Previous->isNot(TT_ImplicitStringLiteral))) {
+    if (!Style.ReflowComments ||
+        CommentPragmasRegex.match(Current.TokenText.substr(2)) ||
+        switchesFormatting(Current))
+      return nullptr;
+    return llvm::make_unique<BreakableLineCommentSection>(
+        Current, StartColumn, Current.OriginalColumn, !Current.Previous,
+        /*InPPDirective=*/false, Encoding, Style);
+  }
+  return nullptr;
+}
+
+std::pair<unsigned, bool>
+ContinuationIndenter::breakProtrudingToken(const FormatToken &Current,
+                                           LineState &State, bool AllowBreak,
+                                           bool DryRun, bool Strict) {
+  std::unique_ptr<const BreakableToken> Token =
+      createBreakableToken(Current, State, AllowBreak);
+  if (!Token)
+    return {0, false};
+  assert(Token->getLineCount() > 0);
+  unsigned ColumnLimit = getColumnLimit(State);
+  if (Current.is(TT_LineComment)) {
+    // We don't insert backslashes when breaking line comments.
+    ColumnLimit = Style.ColumnLimit;
+  }
+  if (Current.UnbreakableTailLength >= ColumnLimit)
+    return {0, false};
+  // ColumnWidth was already accounted into State.Column before calling
+  // breakProtrudingToken.
+  unsigned StartColumn = State.Column - Current.ColumnWidth;
+  unsigned NewBreakPenalty = Current.isStringLiteral()
+                                 ? Style.PenaltyBreakString
+                                 : Style.PenaltyBreakComment;
+  // Stores whether we intentionally decide to let a line exceed the column
+  // limit.
+  bool Exceeded = false;
+  // Stores whether we introduce a break anywhere in the token.
+  bool BreakInserted = Token->introducesBreakBeforeToken();
+  // Store whether we inserted a new line break at the end of the previous
+  // logical line.
+  bool NewBreakBefore = false;
+  // We use a conservative reflowing strategy. Reflow starts after a line is
+  // broken or the corresponding whitespace compressed. Reflow ends as soon as a
+  // line that doesn't get reflown with the previous line is reached.
+  bool Reflow = false;
+  // Keep track of where we are in the token:
+  // Where we are in the content of the current logical line.
+  unsigned TailOffset = 0;
+  // The column number we're currently at.
+  unsigned ContentStartColumn =
+      Token->getContentStartColumn(0, /*Break=*/false);
+  // The number of columns left in the current logical line after TailOffset.
+  unsigned RemainingTokenColumns =
+      Token->getRemainingLength(0, TailOffset, ContentStartColumn);
+  // Adapt the start of the token, for example indent.
+  if (!DryRun)
+    Token->adaptStartOfLine(0, Whitespaces);
+
+  unsigned ContentIndent = 0;
+  unsigned Penalty = 0;
+  LLVM_DEBUG(llvm::dbgs() << "Breaking protruding token at column "
+                          << StartColumn << ".\n");
+  for (unsigned LineIndex = 0, EndIndex = Token->getLineCount();
+       LineIndex != EndIndex; ++LineIndex) {
+    LLVM_DEBUG(llvm::dbgs()
+               << "  Line: " << LineIndex << " (Reflow: " << Reflow << ")\n");
+    NewBreakBefore = false;
+    // If we did reflow the previous line, we'll try reflowing again. Otherwise
+    // we'll start reflowing if the current line is broken or whitespace is
+    // compressed.
+    bool TryReflow = Reflow;
+    // Break the current token until we can fit the rest of the line.
+    while (ContentStartColumn + RemainingTokenColumns > ColumnLimit) {
+      LLVM_DEBUG(llvm::dbgs() << "    Over limit, need: "
+                              << (ContentStartColumn + RemainingTokenColumns)
+                              << ", space: " << ColumnLimit
+                              << ", reflown prefix: " << ContentStartColumn
+                              << ", offset in line: " << TailOffset << "\n");
+      // If the current token doesn't fit, find the latest possible split in the
+      // current line so that breaking at it will be under the column limit.
+      // FIXME: Use the earliest possible split while reflowing to correctly
+      // compress whitespace within a line.
+      BreakableToken::Split Split =
+          Token->getSplit(LineIndex, TailOffset, ColumnLimit,
+                          ContentStartColumn, CommentPragmasRegex);
+      if (Split.first == StringRef::npos) {
+        // No break opportunity - update the penalty and continue with the next
+        // logical line.
+        if (LineIndex < EndIndex - 1)
+          // The last line's penalty is handled in addNextStateToQueue() or when
+          // calling replaceWhitespaceAfterLastLine below.
+          Penalty += Style.PenaltyExcessCharacter *
+                     (ContentStartColumn + RemainingTokenColumns - ColumnLimit);
+        LLVM_DEBUG(llvm::dbgs() << "    No break opportunity.\n");
+        break;
+      }
+      assert(Split.first != 0);
+
+      if (Token->supportsReflow()) {
+        // Check whether the next natural split point after the current one can
+        // still fit the line, either because we can compress away whitespace,
+        // or because the penalty the excess characters introduce is lower than
+        // the break penalty.
+        // We only do this for tokens that support reflowing, and thus allow us
+        // to change the whitespace arbitrarily (e.g. comments).
+        // Other tokens, like string literals, can be broken on arbitrary
+        // positions.
+
+        // First, compute the columns from TailOffset to the next possible split
+        // position.
+        // For example:
+        // ColumnLimit:     |
+        // // Some text   that    breaks
+        //    ^ tail offset
+        //             ^-- split
+        //    ^-------- to split columns
+        //                    ^--- next split
+        //    ^--------------- to next split columns
+        unsigned ToSplitColumns = Token->getRangeLength(
+            LineIndex, TailOffset, Split.first, ContentStartColumn);
+        LLVM_DEBUG(llvm::dbgs() << "    ToSplit: " << ToSplitColumns << "\n");
+
+        BreakableToken::Split NextSplit = Token->getSplit(
+            LineIndex, TailOffset + Split.first + Split.second, ColumnLimit,
+            ContentStartColumn + ToSplitColumns + 1, CommentPragmasRegex);
+        // Compute the columns necessary to fit the next non-breakable sequence
+        // into the current line.
+        unsigned ToNextSplitColumns = 0;
+        if (NextSplit.first == StringRef::npos) {
+          ToNextSplitColumns = Token->getRemainingLength(LineIndex, TailOffset,
+                                                         ContentStartColumn);
+        } else {
+          ToNextSplitColumns = Token->getRangeLength(
+              LineIndex, TailOffset,
+              Split.first + Split.second + NextSplit.first, ContentStartColumn);
+        }
+        // Compress the whitespace between the break and the start of the next
+        // unbreakable sequence.
+        ToNextSplitColumns =
+            Token->getLengthAfterCompression(ToNextSplitColumns, Split);
+        LLVM_DEBUG(llvm::dbgs()
+                   << "    ContentStartColumn: " << ContentStartColumn << "\n");
+        LLVM_DEBUG(llvm::dbgs()
+                   << "    ToNextSplit: " << ToNextSplitColumns << "\n");
+        // If the whitespace compression makes us fit, continue on the current
+        // line.
+        bool ContinueOnLine =
+            ContentStartColumn + ToNextSplitColumns <= ColumnLimit;
+        unsigned ExcessCharactersPenalty = 0;
+        if (!ContinueOnLine && !Strict) {
+          // Similarly, if the excess characters' penalty is lower than the
+          // penalty of introducing a new break, continue on the current line.
+          ExcessCharactersPenalty =
+              (ContentStartColumn + ToNextSplitColumns - ColumnLimit) *
+              Style.PenaltyExcessCharacter;
+          LLVM_DEBUG(llvm::dbgs()
+                     << "    Penalty excess: " << ExcessCharactersPenalty
+                     << "\n            break : " << NewBreakPenalty << "\n");
+          if (ExcessCharactersPenalty < NewBreakPenalty) {
+            Exceeded = true;
+            ContinueOnLine = true;
+          }
+        }
+        if (ContinueOnLine) {
+          LLVM_DEBUG(llvm::dbgs() << "    Continuing on line...\n");
+          // The current line fits after compressing the whitespace - reflow
+          // the next line into it if possible.
+          TryReflow = true;
+          if (!DryRun)
+            Token->compressWhitespace(LineIndex, TailOffset, Split,
+                                      Whitespaces);
+          // When we continue on the same line, leave one space between content.
+          ContentStartColumn += ToSplitColumns + 1;
+          Penalty += ExcessCharactersPenalty;
+          TailOffset += Split.first + Split.second;
+          RemainingTokenColumns = Token->getRemainingLength(
+              LineIndex, TailOffset, ContentStartColumn);
+          continue;
+        }
+      }
+      LLVM_DEBUG(llvm::dbgs() << "    Breaking...\n");
+      // Update the ContentIndent only if the current line was not reflown with
+      // the previous line, since in that case the previous line should still
+      // determine the ContentIndent. Also never intent the last line.
+      if (!Reflow)
+        ContentIndent = Token->getContentIndent(LineIndex);
+      LLVM_DEBUG(llvm::dbgs()
+                 << "    ContentIndent: " << ContentIndent << "\n");
+      ContentStartColumn = ContentIndent + Token->getContentStartColumn(
+                                               LineIndex, /*Break=*/true);
+
+      unsigned NewRemainingTokenColumns = Token->getRemainingLength(
+          LineIndex, TailOffset + Split.first + Split.second,
+          ContentStartColumn);
+      if (NewRemainingTokenColumns == 0) {
+        // No content to indent.
+        ContentIndent = 0;
+        ContentStartColumn =
+            Token->getContentStartColumn(LineIndex, /*Break=*/true);
+        NewRemainingTokenColumns = Token->getRemainingLength(
+            LineIndex, TailOffset + Split.first + Split.second,
+            ContentStartColumn);
+      }
+
+      // When breaking before a tab character, it may be moved by a few columns,
+      // but will still be expanded to the next tab stop, so we don't save any
+      // columns.
+      if (NewRemainingTokenColumns == RemainingTokenColumns) {
+        // FIXME: Do we need to adjust the penalty?
+        break;
+      }
+      assert(NewRemainingTokenColumns < RemainingTokenColumns);
+
+      LLVM_DEBUG(llvm::dbgs() << "    Breaking at: " << TailOffset + Split.first
+                              << ", " << Split.second << "\n");
+      if (!DryRun)
+        Token->insertBreak(LineIndex, TailOffset, Split, ContentIndent,
+                           Whitespaces);
+
+      Penalty += NewBreakPenalty;
+      TailOffset += Split.first + Split.second;
+      RemainingTokenColumns = NewRemainingTokenColumns;
+      BreakInserted = true;
+      NewBreakBefore = true;
+    }
+    // In case there's another line, prepare the state for the start of the next
+    // line.
+    if (LineIndex + 1 != EndIndex) {
+      unsigned NextLineIndex = LineIndex + 1;
+      if (NewBreakBefore)
+        // After breaking a line, try to reflow the next line into the current
+        // one once RemainingTokenColumns fits.
+        TryReflow = true;
+      if (TryReflow) {
+        // We decided that we want to try reflowing the next line into the
+        // current one.
+        // We will now adjust the state as if the reflow is successful (in
+        // preparation for the next line), and see whether that works. If we
+        // decide that we cannot reflow, we will later reset the state to the
+        // start of the next line.
+        Reflow = false;
+        // As we did not continue breaking the line, RemainingTokenColumns is
+        // known to fit after ContentStartColumn. Adapt ContentStartColumn to
+        // the position at which we want to format the next line if we do
+        // actually reflow.
+        // When we reflow, we need to add a space between the end of the current
+        // line and the next line's start column.
+        ContentStartColumn += RemainingTokenColumns + 1;
+        // Get the split that we need to reflow next logical line into the end
+        // of the current one; the split will include any leading whitespace of
+        // the next logical line.
+        BreakableToken::Split SplitBeforeNext =
+            Token->getReflowSplit(NextLineIndex, CommentPragmasRegex);
+        LLVM_DEBUG(llvm::dbgs()
+                   << "    Size of reflown text: " << ContentStartColumn
+                   << "\n    Potential reflow split: ");
+        if (SplitBeforeNext.first != StringRef::npos) {
+          LLVM_DEBUG(llvm::dbgs() << SplitBeforeNext.first << ", "
+                                  << SplitBeforeNext.second << "\n");
+          TailOffset = SplitBeforeNext.first + SplitBeforeNext.second;
+          // If the rest of the next line fits into the current line below the
+          // column limit, we can safely reflow.
+          RemainingTokenColumns = Token->getRemainingLength(
+              NextLineIndex, TailOffset, ContentStartColumn);
+          Reflow = true;
+          if (ContentStartColumn + RemainingTokenColumns > ColumnLimit) {
+            LLVM_DEBUG(llvm::dbgs()
+                       << "    Over limit after reflow, need: "
+                       << (ContentStartColumn + RemainingTokenColumns)
+                       << ", space: " << ColumnLimit
+                       << ", reflown prefix: " << ContentStartColumn
+                       << ", offset in line: " << TailOffset << "\n");
+            // If the whole next line does not fit, try to find a point in
+            // the next line at which we can break so that attaching the part
+            // of the next line to that break point onto the current line is
+            // below the column limit.
+            BreakableToken::Split Split =
+                Token->getSplit(NextLineIndex, TailOffset, ColumnLimit,
+                                ContentStartColumn, CommentPragmasRegex);
+            if (Split.first == StringRef::npos) {
+              LLVM_DEBUG(llvm::dbgs() << "    Did not find later break\n");
+              Reflow = false;
+            } else {
+              // Check whether the first split point gets us below the column
+              // limit. Note that we will execute this split below as part of
+              // the normal token breaking and reflow logic within the line.
+              unsigned ToSplitColumns = Token->getRangeLength(
+                  NextLineIndex, TailOffset, Split.first, ContentStartColumn);
+              if (ContentStartColumn + ToSplitColumns > ColumnLimit) {
+                LLVM_DEBUG(llvm::dbgs() << "    Next split protrudes, need: "
+                                        << (ContentStartColumn + ToSplitColumns)
+                                        << ", space: " << ColumnLimit);
+                unsigned ExcessCharactersPenalty =
+                    (ContentStartColumn + ToSplitColumns - ColumnLimit) *
+                    Style.PenaltyExcessCharacter;
+                if (NewBreakPenalty < ExcessCharactersPenalty) {
+                  Reflow = false;
+                }
+              }
+            }
+          }
+        } else {
+          LLVM_DEBUG(llvm::dbgs() << "not found.\n");
+        }
+      }
+      if (!Reflow) {
+        // If we didn't reflow into the next line, the only space to consider is
+        // the next logical line. Reset our state to match the start of the next
+        // line.
+        TailOffset = 0;
+        ContentStartColumn =
+            Token->getContentStartColumn(NextLineIndex, /*Break=*/false);
+        RemainingTokenColumns = Token->getRemainingLength(
+            NextLineIndex, TailOffset, ContentStartColumn);
+        // Adapt the start of the token, for example indent.
+        if (!DryRun)
+          Token->adaptStartOfLine(NextLineIndex, Whitespaces);
+      } else {
+        // If we found a reflow split and have added a new break before the next
+        // line, we are going to remove the line break at the start of the next
+        // logical line. For example, here we'll add a new line break after
+        // 'text', and subsequently delete the line break between 'that' and
+        // 'reflows'.
+        //   // some text that
+        //   // reflows
+        // ->
+        //   // some text
+        //   // that reflows
+        // When adding the line break, we also added the penalty for it, so we
+        // need to subtract that penalty again when we remove the line break due
+        // to reflowing.
+        if (NewBreakBefore) {
+          assert(Penalty >= NewBreakPenalty);
+          Penalty -= NewBreakPenalty;
+        }
+        if (!DryRun)
+          Token->reflow(NextLineIndex, Whitespaces);
+      }
+    }
+  }
+
+  BreakableToken::Split SplitAfterLastLine =
+      Token->getSplitAfterLastLine(TailOffset);
+  if (SplitAfterLastLine.first != StringRef::npos) {
+    LLVM_DEBUG(llvm::dbgs() << "Replacing whitespace after last line.\n");
+
+    // We add the last line's penalty here, since that line is going to be split
+    // now.
+    Penalty += Style.PenaltyExcessCharacter *
+               (ContentStartColumn + RemainingTokenColumns - ColumnLimit);
+
+    if (!DryRun)
+      Token->replaceWhitespaceAfterLastLine(TailOffset, SplitAfterLastLine,
+                                            Whitespaces);
+    ContentStartColumn =
+        Token->getContentStartColumn(Token->getLineCount() - 1, /*Break=*/true);
+    RemainingTokenColumns = Token->getRemainingLength(
+        Token->getLineCount() - 1,
+        TailOffset + SplitAfterLastLine.first + SplitAfterLastLine.second,
+        ContentStartColumn);
+  }
+
+  State.Column = ContentStartColumn + RemainingTokenColumns -
+                 Current.UnbreakableTailLength;
+
+  if (BreakInserted) {
+    // If we break the token inside a parameter list, we need to break before
+    // the next parameter on all levels, so that the next parameter is clearly
+    // visible. Line comments already introduce a break.
+    if (Current.isNot(TT_LineComment)) {
+      for (unsigned i = 0, e = State.Stack.size(); i != e; ++i)
+        State.Stack[i].BreakBeforeParameter = true;
+    }
+
+    if (Current.is(TT_BlockComment))
+      State.NoContinuation = true;
+
+    State.Stack.back().LastSpace = StartColumn;
+  }
+
+  Token->updateNextToken(State);
+
+  return {Penalty, Exceeded};
+}
+
+unsigned ContinuationIndenter::getColumnLimit(const LineState &State) const {
+  // In preprocessor directives reserve two chars for trailing " \"
+  return Style.ColumnLimit - (State.Line->InPPDirective ? 2 : 0);
+}
+
+bool ContinuationIndenter::nextIsMultilineString(const LineState &State) {
+  const FormatToken &Current = *State.NextToken;
+  if (!Current.isStringLiteral() || Current.is(TT_ImplicitStringLiteral))
+    return false;
+  // We never consider raw string literals "multiline" for the purpose of
+  // AlwaysBreakBeforeMultilineStrings implementation as they are special-cased
+  // (see TokenAnnotator::mustBreakBefore().
+  if (Current.TokenText.startswith("R\""))
+    return false;
+  if (Current.IsMultiline)
+    return true;
+  if (Current.getNextNonComment() &&
+      Current.getNextNonComment()->isStringLiteral())
+    return true; // Implicit concatenation.
+  if (Style.ColumnLimit != 0 && Style.BreakStringLiterals &&
+      State.Column + Current.ColumnWidth + Current.UnbreakableTailLength >
+          Style.ColumnLimit)
+    return true; // String will be split.
+  return false;
+}
+
+} // namespace format
+} // namespace clang