1	//===--- ContinuationIndenter.cpp - Format C++ code -----------------------===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	///
9	/// \file
10	/// This file implements the continuation indenter.
11	///
12	//===----------------------------------------------------------------------===//
13
14	#include "ContinuationIndenter.h"
15	#include "BreakableToken.h"
16	#include "FormatInternal.h"
17	#include "FormatToken.h"
18	#include "WhitespaceManager.h"
19	#include "clang/Basic/OperatorPrecedence.h"
20	#include "clang/Basic/SourceManager.h"
21	#include "clang/Basic/TokenKinds.h"
22	#include "clang/Format/Format.h"
23	#include "llvm/ADT/StringSet.h"
24	#include "llvm/Support/Debug.h"
25	#include <optional>
26
27	#define DEBUG_TYPE "format-indenter"
28
29	namespace clang {
30	namespace format {
31
32	// Returns true if a TT_SelectorName should be indented when wrapped,
33	// false otherwise.
34	static bool shouldIndentWrappedSelectorName(const FormatStyle &Style,
35	LineType LineType) {
36	return Style.IndentWrappedFunctionNames || LineType == LT_ObjCMethodDecl;
37	}
38
39	// Returns true if a binary operator following \p Tok should be unindented when
40	// the style permits it.
41	static bool shouldUnindentNextOperator(const FormatToken &Tok) {
42	const FormatToken *Previous = Tok.getPreviousNonComment();
43	return Previous && (Previous->getPrecedence() == prec::Assignment ||
44	Previous->isOneOf(K1: tok::kw_return, K2: TT_RequiresClause));
45	}
46
47	// Returns the length of everything up to the first possible line break after
48	// the ), ], } or > matching \c Tok.
49	static unsigned getLengthToMatchingParen(const FormatToken &Tok,
50	ArrayRef<ParenState> Stack) {
51	// Normally whether or not a break before T is possible is calculated and
52	// stored in T.CanBreakBefore. Braces, array initializers and text proto
53	// messages like `key: < ... >` are an exception: a break is possible
54	// before a closing brace R if a break was inserted after the corresponding
55	// opening brace. The information about whether or not a break is needed
56	// before a closing brace R is stored in the ParenState field
57	// S.BreakBeforeClosingBrace where S is the state that R closes.
58	//
59	// In order to decide whether there can be a break before encountered right
60	// braces, this implementation iterates over the sequence of tokens and over
61	// the paren stack in lockstep, keeping track of the stack level which visited
62	// right braces correspond to in MatchingStackIndex.
63	//
64	// For example, consider:
65	// L. <- line number
66	// 1. {
67	// 2. {1},
68	// 3. {2},
69	// 4. {{3}}}
70	// ^ where we call this method with this token.
71	// The paren stack at this point contains 3 brace levels:
72	// 0. { at line 1, BreakBeforeClosingBrace: true
73	// 1. first { at line 4, BreakBeforeClosingBrace: false
74	// 2. second { at line 4, BreakBeforeClosingBrace: false,
75	// where there might be fake parens levels in-between these levels.
76	// The algorithm will start at the first } on line 4, which is the matching
77	// brace of the initial left brace and at level 2 of the stack. Then,
78	// examining BreakBeforeClosingBrace: false at level 2, it will continue to
79	// the second } on line 4, and will traverse the stack downwards until it
80	// finds the matching { on level 1. Then, examining BreakBeforeClosingBrace:
81	// false at level 1, it will continue to the third } on line 4 and will
82	// traverse the stack downwards until it finds the matching { on level 0.
83	// Then, examining BreakBeforeClosingBrace: true at level 0, the algorithm
84	// will stop and will use the second } on line 4 to determine the length to
85	// return, as in this example the range will include the tokens: {3}}
86	//
87	// The algorithm will only traverse the stack if it encounters braces, array
88	// initializer squares or text proto angle brackets.
89	if (!Tok.MatchingParen)
90	return 0;
91	FormatToken *End = Tok.MatchingParen;
92	// Maintains a stack level corresponding to the current End token.
93	int MatchingStackIndex = Stack.size() - 1;
94	// Traverses the stack downwards, looking for the level to which LBrace
95	// corresponds. Returns either a pointer to the matching level or nullptr if
96	// LParen is not found in the initial portion of the stack up to
97	// MatchingStackIndex.
98	auto FindParenState = [&](const FormatToken *LBrace) -> const ParenState * {
99	while (MatchingStackIndex >= 0 && Stack[MatchingStackIndex].Tok != LBrace)
100	--MatchingStackIndex;
101	return MatchingStackIndex >= 0 ? &Stack[MatchingStackIndex] : nullptr;
102	};
103	for (; End->Next; End = End->Next) {
104	if (End->Next->CanBreakBefore)
105	break;
106	if (!End->Next->closesScope())
107	continue;
108	if (End->Next->MatchingParen &&
109	End->Next->MatchingParen->isOneOf(
110	K1: tok::l_brace, K2: TT_ArrayInitializerLSquare, Ks: tok::less)) {
111	const ParenState *State = FindParenState(End->Next->MatchingParen);
112	if (State && State->BreakBeforeClosingBrace)
113	break;
114	}
115	}
116	return End->TotalLength - Tok.TotalLength + 1;
117	}
118
119	static unsigned getLengthToNextOperator(const FormatToken &Tok) {
120	if (!Tok.NextOperator)
121	return 0;
122	return Tok.NextOperator->TotalLength - Tok.TotalLength;
123	}
124
125	// Returns \c true if \c Tok is the "." or "->" of a call and starts the next
126	// segment of a builder type call.
127	static bool startsSegmentOfBuilderTypeCall(const FormatToken &Tok) {
128	return Tok.isMemberAccess() && Tok.Previous && Tok.Previous->closesScope();
129	}
130
131	// Returns \c true if \c Token in an alignable binary operator
132	static bool isAlignableBinaryOperator(const FormatToken &Token) {
133	// No need to align binary operators that only have two operands.
134	bool HasTwoOperands = Token.OperatorIndex == 0 && !Token.NextOperator;
135	return Token.is(TT: TT_BinaryOperator) && !HasTwoOperands &&
136	Token.getPrecedence() > prec::Conditional &&
137	Token.getPrecedence() < prec::PointerToMember;
138	}
139
140	// Returns \c true if \c Current starts the next operand in a binary operation.
141	static bool startsNextOperand(const FormatToken &Current) {
142	assert(Current.Previous);
143	const auto &Previous = *Current.Previous;
144	return isAlignableBinaryOperator(Token: Previous) && !Current.isTrailingComment();
145	}
146
147	// Returns \c true if \c Current is a binary operation that must break.
148	static bool mustBreakBinaryOperation(const FormatToken &Current,
149	const FormatStyle &Style) {
150	return Style.BreakBinaryOperations != FormatStyle::BBO_Never &&
151	Current.CanBreakBefore &&
152	(Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None
153	? startsNextOperand
154	: isAlignableBinaryOperator)(Current);
155	}
156
157	static bool opensProtoMessageField(const FormatToken &LessTok,
158	const FormatStyle &Style) {
159	if (LessTok.isNot(Kind: tok::less))
160	return false;
161	return Style.isTextProto() ||
162	(Style.Language == FormatStyle::LK_Proto &&
163	(LessTok.NestingLevel > 0 ||
164	(LessTok.Previous && LessTok.Previous->is(Kind: tok::equal))));
165	}
166
167	// Returns the delimiter of a raw string literal, or std::nullopt if TokenText
168	// is not the text of a raw string literal. The delimiter could be the empty
169	// string. For example, the delimiter of R"deli(cont)deli" is deli.
170	static std::optional<StringRef> getRawStringDelimiter(StringRef TokenText) {
171	if (TokenText.size() < 5 // The smallest raw string possible is 'R"()"'.
172	|| !TokenText.starts_with(Prefix: "R\"") || !TokenText.ends_with(Suffix: "\"")) {
173	return std::nullopt;
174	}
175
176	// A raw string starts with 'R"<delimiter>(' and delimiter is ascii and has
177	// size at most 16 by the standard, so the first '(' must be among the first
178	// 19 bytes.
179	size_t LParenPos = TokenText.substr(Start: 0, N: 19).find_first_of(C: '(');
180	if (LParenPos == StringRef::npos)
181	return std::nullopt;
182	StringRef Delimiter = TokenText.substr(Start: 2, N: LParenPos - 2);
183
184	// Check that the string ends in ')Delimiter"'.
185	size_t RParenPos = TokenText.size() - Delimiter.size() - 2;
186	if (TokenText[RParenPos] != ')')
187	return std::nullopt;
188	if (!TokenText.substr(Start: RParenPos + 1).starts_with(Prefix: Delimiter))
189	return std::nullopt;
190	return Delimiter;
191	}
192
193	// Returns the canonical delimiter for \p Language, or the empty string if no
194	// canonical delimiter is specified.
195	static StringRef
196	getCanonicalRawStringDelimiter(const FormatStyle &Style,
197	FormatStyle::LanguageKind Language) {
198	for (const auto &Format : Style.RawStringFormats)
199	if (Format.Language == Language)
200	return StringRef(Format.CanonicalDelimiter);
201	return "";
202	}
203
204	RawStringFormatStyleManager::RawStringFormatStyleManager(
205	const FormatStyle &CodeStyle) {
206	for (const auto &RawStringFormat : CodeStyle.RawStringFormats) {
207	std::optional<FormatStyle> LanguageStyle =
208	CodeStyle.GetLanguageStyle(Language: RawStringFormat.Language);
209	if (!LanguageStyle) {
210	FormatStyle PredefinedStyle;
211	if (!getPredefinedStyle(Name: RawStringFormat.BasedOnStyle,
212	Language: RawStringFormat.Language, Style: &PredefinedStyle)) {
213	PredefinedStyle = getLLVMStyle();
214	PredefinedStyle.Language = RawStringFormat.Language;
215	}
216	LanguageStyle = PredefinedStyle;
217	}
218	LanguageStyle->ColumnLimit = CodeStyle.ColumnLimit;
219	for (StringRef Delimiter : RawStringFormat.Delimiters)
220	DelimiterStyle.insert(KV: {Delimiter, *LanguageStyle});
221	for (StringRef EnclosingFunction : RawStringFormat.EnclosingFunctions)
222	EnclosingFunctionStyle.insert(KV: {EnclosingFunction, *LanguageStyle});
223	}
224	}
225
226	std::optional<FormatStyle>
227	RawStringFormatStyleManager::getDelimiterStyle(StringRef Delimiter) const {
228	auto It = DelimiterStyle.find(Key: Delimiter);
229	if (It == DelimiterStyle.end())
230	return std::nullopt;
231	return It->second;
232	}
233
234	std::optional<FormatStyle>
235	RawStringFormatStyleManager::getEnclosingFunctionStyle(
236	StringRef EnclosingFunction) const {
237	auto It = EnclosingFunctionStyle.find(Key: EnclosingFunction);
238	if (It == EnclosingFunctionStyle.end())
239	return std::nullopt;
240	return It->second;
241	}
242
243	ContinuationIndenter::ContinuationIndenter(const FormatStyle &Style,
244	const AdditionalKeywords &Keywords,
245	const SourceManager &SourceMgr,
246	WhitespaceManager &Whitespaces,
247	encoding::Encoding Encoding,
248	bool BinPackInconclusiveFunctions)
249	: Style(Style), Keywords(Keywords), SourceMgr(SourceMgr),
250	Whitespaces(Whitespaces), Encoding(Encoding),
251	BinPackInconclusiveFunctions(BinPackInconclusiveFunctions),
252	CommentPragmasRegex(Style.CommentPragmas), RawStringFormats(Style) {}
253
254	LineState ContinuationIndenter::getInitialState(unsigned FirstIndent,
255	unsigned FirstStartColumn,
256	const AnnotatedLine *Line,
257	bool DryRun) {
258	LineState State;
259	State.FirstIndent = FirstIndent;
260	if (FirstStartColumn && Line->First->NewlinesBefore == 0)
261	State.Column = FirstStartColumn;
262	else
263	State.Column = FirstIndent;
264	// With preprocessor directive indentation, the line starts on column 0
265	// since it's indented after the hash, but FirstIndent is set to the
266	// preprocessor indent.
267	if (Style.IndentPPDirectives == FormatStyle::PPDIS_AfterHash &&
268	(Line->Type == LT_PreprocessorDirective ||
269	Line->Type == LT_ImportStatement)) {
270	State.Column = 0;
271	}
272	State.Line = Line;
273	State.NextToken = Line->First;
274	State.Stack.push_back(Elt: ParenState(/*Tok=*/nullptr, FirstIndent, FirstIndent,
275	/*AvoidBinPacking=*/false,
276	/*NoLineBreak=*/false));
277	State.NoContinuation = false;
278	State.StartOfStringLiteral = 0;
279	State.NoLineBreak = false;
280	State.StartOfLineLevel = 0;
281	State.LowestLevelOnLine = 0;
282	State.IgnoreStackForComparison = false;
283
284	if (Style.isTextProto()) {
285	// We need this in order to deal with the bin packing of text fields at
286	// global scope.
287	auto &CurrentState = State.Stack.back();
288	CurrentState.AvoidBinPacking = true;
289	CurrentState.BreakBeforeParameter = true;
290	CurrentState.AlignColons = false;
291	}
292
293	// The first token has already been indented and thus consumed.
294	moveStateToNextToken(State, DryRun, /*Newline=*/false);
295	return State;
296	}
297
298	bool ContinuationIndenter::canBreak(const LineState &State) {
299	const FormatToken &Current = *State.NextToken;
300	const FormatToken &Previous = *Current.Previous;
301	const auto &CurrentState = State.Stack.back();
302	assert(&Previous == Current.Previous);
303	if (!Current.CanBreakBefore && !(CurrentState.BreakBeforeClosingBrace &&
304	Current.closesBlockOrBlockTypeList(Style))) {
305	return false;
306	}
307	// The opening "{" of a braced list has to be on the same line as the first
308	// element if it is nested in another braced init list or function call.
309	if (!Current.MustBreakBefore && Previous.is(Kind: tok::l_brace) &&
310	Previous.isNot(Kind: TT_DictLiteral) && Previous.is(BBK: BK_BracedInit) &&
311	Previous.Previous &&
312	Previous.Previous->isOneOf(K1: tok::l_brace, K2: tok::l_paren, Ks: tok::comma)) {
313	return false;
314	}
315	// This prevents breaks like:
316	// ...
317	// SomeParameter, OtherParameter).DoSomething(
318	// ...
319	// As they hide "DoSomething" and are generally bad for readability.
320	if (Previous.opensScope() && Previous.isNot(Kind: tok::l_brace) &&
321	State.LowestLevelOnLine < State.StartOfLineLevel &&
322	State.LowestLevelOnLine < Current.NestingLevel) {
323	return false;
324	}
325	if (Current.isMemberAccess() && CurrentState.ContainsUnwrappedBuilder)
326	return false;
327
328	// Don't create a 'hanging' indent if there are multiple blocks in a single
329	// statement and we are aligning lambda blocks to their signatures.
330	if (Previous.is(Kind: tok::l_brace) && State.Stack.size() > 1 &&
331	State.Stack[State.Stack.size() - 2].NestedBlockInlined &&
332	State.Stack[State.Stack.size() - 2].HasMultipleNestedBlocks) {
333	return Style.isCpp() &&
334	Style.LambdaBodyIndentation == FormatStyle::LBI_OuterScope;
335	}
336
337	// Don't break after very short return types (e.g. "void") as that is often
338	// unexpected.
339	if (Current.is(TT: TT_FunctionDeclarationName)) {
340	if (Style.BreakAfterReturnType == FormatStyle::RTBS_None &&
341	State.Column < 6) {
342	return false;
343	}
344
345	if (Style.BreakAfterReturnType == FormatStyle::RTBS_ExceptShortType) {
346	assert(State.Column >= State.FirstIndent);
347	if (State.Column - State.FirstIndent < 6)
348	return false;
349	}
350	}
351
352	// Don't allow breaking before a closing brace of a block-indented braced list
353	// initializer if there isn't already a break.
354	if (Current.is(Kind: tok::r_brace) && Current.MatchingParen &&
355	Current.isBlockIndentedInitRBrace(Style)) {
356	return CurrentState.BreakBeforeClosingBrace;
357	}
358
359	// Allow breaking before the right parens with block indentation if there was
360	// a break after the left parens, which is tracked by BreakBeforeClosingParen.
361	if (Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent &&
362	Current.is(Kind: tok::r_paren)) {
363	return CurrentState.BreakBeforeClosingParen;
364	}
365
366	if (Style.BreakBeforeTemplateCloser && Current.is(TT: TT_TemplateCloser))
367	return CurrentState.BreakBeforeClosingAngle;
368
369	// If binary operators are moved to the next line (including commas for some
370	// styles of constructor initializers), that's always ok.
371	if (!Current.isOneOf(K1: TT_BinaryOperator, K2: tok::comma) &&
372	// Allow breaking opening brace of lambdas (when passed as function
373	// arguments) to a new line when BeforeLambdaBody brace wrapping is
374	// enabled.
375	(!Style.BraceWrapping.BeforeLambdaBody ||
376	Current.isNot(Kind: TT_LambdaLBrace)) &&
377	CurrentState.NoLineBreakInOperand) {
378	return false;
379	}
380
381	if (Previous.is(Kind: tok::l_square) && Previous.is(TT: TT_ObjCMethodExpr))
382	return false;
383
384	if (Current.is(TT: TT_ConditionalExpr) && Previous.is(Kind: tok::r_paren) &&
385	Previous.MatchingParen && Previous.MatchingParen->Previous &&
386	Previous.MatchingParen->Previous->MatchingParen &&
387	Previous.MatchingParen->Previous->MatchingParen->is(TT: TT_LambdaLBrace)) {
388	// We have a lambda within a conditional expression, allow breaking here.
389	assert(Previous.MatchingParen->Previous->is(tok::r_brace));
390	return true;
391	}
392
393	return !State.NoLineBreak && !CurrentState.NoLineBreak;
394	}
395
396	bool ContinuationIndenter::mustBreak(const LineState &State) {
397	const FormatToken &Current = *State.NextToken;
398	const FormatToken &Previous = *Current.Previous;
399	const auto &CurrentState = State.Stack.back();
400	if (Style.BraceWrapping.BeforeLambdaBody && Current.CanBreakBefore &&
401	Current.is(TT: TT_LambdaLBrace) && Previous.isNot(Kind: TT_LineComment)) {
402	auto LambdaBodyLength = getLengthToMatchingParen(Tok: Current, Stack: State.Stack);
403	return LambdaBodyLength > getColumnLimit(State);
404	}
405	if (Current.MustBreakBefore ||
406	(Current.is(TT: TT_InlineASMColon) &&
407	(Style.BreakBeforeInlineASMColon == FormatStyle::BBIAS_Always ||
408	(Style.BreakBeforeInlineASMColon == FormatStyle::BBIAS_OnlyMultiline &&
409	Style.ColumnLimit > 0)))) {
410	return true;
411	}
412	if (CurrentState.BreakBeforeClosingBrace &&
413	(Current.closesBlockOrBlockTypeList(Style) ||
414	(Current.is(Kind: tok::r_brace) && Current.MatchingParen &&
415	Current.isBlockIndentedInitRBrace(Style)))) {
416	return true;
417	}
418	if (CurrentState.BreakBeforeClosingParen && Current.is(Kind: tok::r_paren))
419	return true;
420	if (CurrentState.BreakBeforeClosingAngle && Current.is(TT: TT_TemplateCloser))
421	return true;
422	if (Style.Language == FormatStyle::LK_ObjC &&
423	Style.ObjCBreakBeforeNestedBlockParam &&
424	Current.ObjCSelectorNameParts > 1 &&
425	Current.startsSequence(K1: TT_SelectorName, Tokens: tok::colon, Tokens: tok::caret)) {
426	return true;
427	}
428	// Avoid producing inconsistent states by requiring breaks where they are not
429	// permitted for C# generic type constraints.
430	if (CurrentState.IsCSharpGenericTypeConstraint &&
431	Previous.isNot(Kind: TT_CSharpGenericTypeConstraintComma)) {
432	return false;
433	}
434	if ((startsNextParameter(Current, Style) || Previous.is(Kind: tok::semi) ||
435	(Previous.is(TT: TT_TemplateCloser) && Current.is(TT: TT_StartOfName) &&
436	State.Line->First->isNot(Kind: TT_AttributeSquare) && Style.isCpp() &&
437	// FIXME: This is a temporary workaround for the case where clang-format
438	// sets BreakBeforeParameter to avoid bin packing and this creates a
439	// completely unnecessary line break after a template type that isn't
440	// line-wrapped.
441	(Previous.NestingLevel == 1 ||
442	Style.BinPackParameters == FormatStyle::BPPS_BinPack)) ||
443	(Style.BreakBeforeTernaryOperators && Current.is(TT: TT_ConditionalExpr) &&
444	Previous.isNot(Kind: tok::question)) ||
445	(!Style.BreakBeforeTernaryOperators &&
446	Previous.is(TT: TT_ConditionalExpr))) &&
447	CurrentState.BreakBeforeParameter && !Current.isTrailingComment() &&
448	!Current.isOneOf(K1: tok::r_paren, K2: tok::r_brace)) {
449	return true;
450	}
451	if (CurrentState.IsChainedConditional &&
452	((Style.BreakBeforeTernaryOperators && Current.is(TT: TT_ConditionalExpr) &&
453	Current.is(Kind: tok::colon)) ||
454	(!Style.BreakBeforeTernaryOperators && Previous.is(TT: TT_ConditionalExpr) &&
455	Previous.is(Kind: tok::colon)))) {
456	return true;
457	}
458	if (((Previous.is(TT: TT_DictLiteral) && Previous.is(Kind: tok::l_brace)) ||
459	(Previous.is(TT: TT_ArrayInitializerLSquare) &&
460	Previous.ParameterCount > 1) ||
461	opensProtoMessageField(LessTok: Previous, Style)) &&
462	Style.ColumnLimit > 0 &&
463	getLengthToMatchingParen(Tok: Previous, Stack: State.Stack) + State.Column - 1 >
464	getColumnLimit(State)) {
465	return true;
466	}
467
468	const FormatToken &BreakConstructorInitializersToken =
469	Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon
470	? Previous
471	: Current;
472	if (BreakConstructorInitializersToken.is(TT: TT_CtorInitializerColon) &&
473	(State.Column + State.Line->Last->TotalLength - Previous.TotalLength >
474	getColumnLimit(State) ||
475	CurrentState.BreakBeforeParameter) &&
476	((!Current.isTrailingComment() && Style.ColumnLimit > 0) ||
477	Current.NewlinesBefore > 0)) {
478	return true;
479	}
480
481	if (Current.is(TT: TT_ObjCMethodExpr) && Previous.isNot(Kind: TT_SelectorName) &&
482	State.Line->startsWith(Tokens: TT_ObjCMethodSpecifier)) {
483	return true;
484	}
485	if (Current.is(TT: TT_SelectorName) && Previous.isNot(Kind: tok::at) &&
486	CurrentState.ObjCSelectorNameFound && CurrentState.BreakBeforeParameter &&
487	(Style.ObjCBreakBeforeNestedBlockParam ||
488	!Current.startsSequence(K1: TT_SelectorName, Tokens: tok::colon, Tokens: tok::caret))) {
489	return true;
490	}
491
492	unsigned NewLineColumn = getNewLineColumn(State);
493	if (Current.isMemberAccess() && Style.ColumnLimit != 0 &&
494	State.Column + getLengthToNextOperator(Tok: Current) > Style.ColumnLimit &&
495	(State.Column > NewLineColumn ||
496	Current.NestingLevel < State.StartOfLineLevel)) {
497	return true;
498	}
499
500	if (startsSegmentOfBuilderTypeCall(Tok: Current) &&
501	(CurrentState.CallContinuation != 0 ||
502	CurrentState.BreakBeforeParameter) &&
503	// JavaScript is treated different here as there is a frequent pattern:
504	// SomeFunction(function() {
505	// ...
506	// }.bind(...));
507	// FIXME: We should find a more generic solution to this problem.
508	!(State.Column <= NewLineColumn && Style.isJavaScript()) &&
509	!(Previous.closesScopeAfterBlock() && State.Column <= NewLineColumn)) {
510	return true;
511	}
512
513	// If the template declaration spans multiple lines, force wrap before the
514	// function/class declaration.
515	if (Previous.ClosesTemplateDeclaration && CurrentState.BreakBeforeParameter &&
516	Current.CanBreakBefore) {
517	return true;
518	}
519
520	if (State.Line->First->isNot(Kind: tok::kw_enum) && State.Column <= NewLineColumn)
521	return false;
522
523	if (Style.AlwaysBreakBeforeMultilineStrings &&
524	(NewLineColumn == State.FirstIndent + Style.ContinuationIndentWidth ||
525	Previous.is(Kind: tok::comma) || Current.NestingLevel < 2) &&
526	!Previous.isOneOf(K1: tok::kw_return, K2: tok::lessless, Ks: tok::at,
527	Ks: Keywords.kw_dollar) &&
528	!Previous.isOneOf(K1: TT_InlineASMColon, K2: TT_ConditionalExpr) &&
529	nextIsMultilineString(State)) {
530	return true;
531	}
532
533	// Using CanBreakBefore here and below takes care of the decision whether the
534	// current style uses wrapping before or after operators for the given
535	// operator.
536	if (Previous.is(TT: TT_BinaryOperator) && Current.CanBreakBefore) {
537	const auto PreviousPrecedence = Previous.getPrecedence();
538	if (PreviousPrecedence != prec::Assignment &&
539	CurrentState.BreakBeforeParameter && !Current.isTrailingComment()) {
540	const bool LHSIsBinaryExpr =
541	Previous.Previous && Previous.Previous->EndsBinaryExpression;
542	if (LHSIsBinaryExpr)
543	return true;
544	// If we need to break somewhere inside the LHS of a binary expression, we
545	// should also break after the operator. Otherwise, the formatting would
546	// hide the operator precedence, e.g. in:
547	// if (aaaaaaaaaaaaaa ==
548	// bbbbbbbbbbbbbb && c) {..
549	// For comparisons, we only apply this rule, if the LHS is a binary
550	// expression itself as otherwise, the line breaks seem superfluous.
551	// We need special cases for ">>" which we have split into two ">" while
552	// lexing in order to make template parsing easier.
553	const bool IsComparison =
554	(PreviousPrecedence == prec::Relational ||
555	PreviousPrecedence == prec::Equality ||
556	PreviousPrecedence == prec::Spaceship) &&
557	Previous.Previous &&
558	Previous.Previous->isNot(Kind: TT_BinaryOperator); // For >>.
559	if (!IsComparison)
560	return true;
561	}
562	} else if (Current.is(TT: TT_BinaryOperator) && Current.CanBreakBefore &&
563	CurrentState.BreakBeforeParameter) {
564	return true;
565	}
566
567	// Same as above, but for the first "<<" operator.
568	if (Current.is(Kind: tok::lessless) && Current.isNot(Kind: TT_OverloadedOperator) &&
569	CurrentState.BreakBeforeParameter && CurrentState.FirstLessLess == 0) {
570	return true;
571	}
572
573	if (Current.NestingLevel == 0 && !Current.isTrailingComment()) {
574	// Always break after "template <...>"(*) and leading annotations. This is
575	// only for cases where the entire line does not fit on a single line as a
576	// different LineFormatter would be used otherwise.
577	// *: Except when another option interferes with that, like concepts.
578	if (Previous.ClosesTemplateDeclaration) {
579	if (Current.is(Kind: tok::kw_concept)) {
580	switch (Style.BreakBeforeConceptDeclarations) {
581	case FormatStyle::BBCDS_Allowed:
582	break;
583	case FormatStyle::BBCDS_Always:
584	return true;
585	case FormatStyle::BBCDS_Never:
586	return false;
587	}
588	}
589	if (Current.is(TT: TT_RequiresClause)) {
590	switch (Style.RequiresClausePosition) {
591	case FormatStyle::RCPS_SingleLine:
592	case FormatStyle::RCPS_WithPreceding:
593	return false;
594	default:
595	return true;
596	}
597	}
598	return Style.BreakTemplateDeclarations != FormatStyle::BTDS_No &&
599	(Style.BreakTemplateDeclarations != FormatStyle::BTDS_Leave ||
600	Current.NewlinesBefore > 0);
601	}
602	if (Previous.is(TT: TT_FunctionAnnotationRParen) &&
603	State.Line->Type != LT_PreprocessorDirective) {
604	return true;
605	}
606	if (Previous.is(TT: TT_LeadingJavaAnnotation) && Current.isNot(Kind: tok::l_paren) &&
607	Current.isNot(Kind: TT_LeadingJavaAnnotation)) {
608	return true;
609	}
610	}
611
612	if (Style.isJavaScript() && Previous.is(Kind: tok::r_paren) &&
613	Previous.is(TT: TT_JavaAnnotation)) {
614	// Break after the closing parenthesis of TypeScript decorators before
615	// functions, getters and setters.
616	static const llvm::StringSet<> BreakBeforeDecoratedTokens = {"get", "set",
617	"function"};
618	if (BreakBeforeDecoratedTokens.contains(key: Current.TokenText))
619	return true;
620	}
621
622	if (Current.is(TT: TT_FunctionDeclarationName) &&
623	!State.Line->ReturnTypeWrapped &&
624	// Don't break before a C# function when no break after return type.
625	(!Style.isCSharp() ||
626	Style.BreakAfterReturnType > FormatStyle::RTBS_ExceptShortType) &&
627	// Don't always break between a JavaScript `function` and the function
628	// name.
629	!Style.isJavaScript() && Previous.isNot(Kind: tok::kw_template) &&
630	CurrentState.BreakBeforeParameter) {
631	for (const auto *Tok = &Previous; Tok; Tok = Tok->Previous) {
632	if (Tok->is(TT: TT_LineComment))
633	return false;
634	if (Tok->is(TT: TT_TemplateCloser)) {
635	Tok = Tok->MatchingParen;
636	assert(Tok);
637	}
638	if (Tok->FirstAfterPPLine)
639	return false;
640	}
641
642	return true;
643	}
644
645	// The following could be precomputed as they do not depend on the state.
646	// However, as they should take effect only if the UnwrappedLine does not fit
647	// into the ColumnLimit, they are checked here in the ContinuationIndenter.
648	if (Style.ColumnLimit != 0 && Previous.is(BBK: BK_Block) &&
649	Previous.is(Kind: tok::l_brace) &&
650	!Current.isOneOf(K1: tok::r_brace, K2: tok::comment)) {
651	return true;
652	}
653
654	if (Current.is(Kind: tok::lessless) &&
655	((Previous.is(Kind: tok::identifier) && Previous.TokenText == "endl") ||
656	(Previous.Tok.isLiteral() && (Previous.TokenText.ends_with(Suffix: "\\n\"") ||
657	Previous.TokenText == "\'\\n\'")))) {
658	return true;
659	}
660
661	if (Previous.is(TT: TT_BlockComment) && Previous.IsMultiline)
662	return true;
663
664	if (State.NoContinuation)
665	return true;
666
667	return false;
668	}
669
670	unsigned ContinuationIndenter::addTokenToState(LineState &State, bool Newline,
671	bool DryRun,
672	unsigned ExtraSpaces) {
673	const FormatToken &Current = *State.NextToken;
674	assert(State.NextToken->Previous);
675	const FormatToken &Previous = *State.NextToken->Previous;
676
677	assert(!State.Stack.empty());
678	State.NoContinuation = false;
679
680	if (Current.is(TT: TT_ImplicitStringLiteral) &&
681	(!Previous.Tok.getIdentifierInfo() ||
682	Previous.Tok.getIdentifierInfo()->getPPKeywordID() ==
683	tok::pp_not_keyword)) {
684	unsigned EndColumn =
685	SourceMgr.getSpellingColumnNumber(Loc: Current.WhitespaceRange.getEnd());
686	if (Current.LastNewlineOffset != 0) {
687	// If there is a newline within this token, the final column will solely
688	// determined by the current end column.
689	State.Column = EndColumn;
690	} else {
691	unsigned StartColumn =
692	SourceMgr.getSpellingColumnNumber(Loc: Current.WhitespaceRange.getBegin());
693	assert(EndColumn >= StartColumn);
694	State.Column += EndColumn - StartColumn;
695	}
696	moveStateToNextToken(State, DryRun, /*Newline=*/false);
697	return 0;
698	}
699
700	unsigned Penalty = 0;
701	if (Newline)
702	Penalty = addTokenOnNewLine(State, DryRun);
703	else
704	addTokenOnCurrentLine(State, DryRun, ExtraSpaces);
705
706	return moveStateToNextToken(State, DryRun, Newline) + Penalty;
707	}
708
709	void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
710	unsigned ExtraSpaces) {
711	FormatToken &Current = *State.NextToken;
712	assert(State.NextToken->Previous);
713	const FormatToken &Previous = *State.NextToken->Previous;
714	auto &CurrentState = State.Stack.back();
715
716	// Deal with lambda arguments in C++. The aim here is to ensure that we don't
717	// over-indent lambda function bodies when lambdas are passed as arguments to
718	// function calls. We do this by ensuring that either all arguments (including
719	// any lambdas) go on the same line as the function call, or we break before
720	// the first argument.
721	auto DisallowLineBreaks = [&] {
722	if (!Style.isCpp() ||
723	Style.LambdaBodyIndentation == FormatStyle::LBI_OuterScope) {
724	return false;
725	}
726
727	// For example, `/*Newline=*/false`.
728	if (Previous.is(TT: TT_BlockComment) && Current.SpacesRequiredBefore == 0)
729	return false;
730
731	if (Current.isOneOf(K1: tok::comment, K2: tok::l_paren, Ks: TT_LambdaLSquare))
732	return false;
733
734	const auto *Prev = Current.getPreviousNonComment();
735	if (!Prev || Prev->isNot(Kind: tok::l_paren))
736	return false;
737
738	if (Prev->BlockParameterCount == 0)
739	return false;
740
741	// Multiple lambdas in the same function call.
742	if (Prev->BlockParameterCount > 1)
743	return true;
744
745	// A lambda followed by another arg.
746	if (!Prev->Role)
747	return false;
748
749	const auto *Comma = Prev->Role->lastComma();
750	if (!Comma)
751	return false;
752
753	const auto *Next = Comma->getNextNonComment();
754	return Next && !Next->isOneOf(K1: TT_LambdaLSquare, K2: tok::l_brace, Ks: tok::caret);
755	};
756
757	if (DisallowLineBreaks())
758	State.NoLineBreak = true;
759
760	if (Current.is(Kind: tok::equal) &&
761	(State.Line->First->is(Kind: tok::kw_for) || Current.NestingLevel == 0) &&
762	CurrentState.VariablePos == 0 &&
763	(!Previous.Previous ||
764	Previous.Previous->isNot(Kind: TT_DesignatedInitializerPeriod))) {
765	CurrentState.VariablePos = State.Column;
766	// Move over * and & if they are bound to the variable name.
767	const FormatToken *Tok = &Previous;
768	while (Tok && CurrentState.VariablePos >= Tok->ColumnWidth) {
769	CurrentState.VariablePos -= Tok->ColumnWidth;
770	if (Tok->SpacesRequiredBefore != 0)
771	break;
772	Tok = Tok->Previous;
773	}
774	if (Previous.PartOfMultiVariableDeclStmt)
775	CurrentState.LastSpace = CurrentState.VariablePos;
776	}
777
778	unsigned Spaces = Current.SpacesRequiredBefore + ExtraSpaces;
779
780	// Indent preprocessor directives after the hash if required.
781	int PPColumnCorrection = 0;
782	if (Style.IndentPPDirectives == FormatStyle::PPDIS_AfterHash &&
783	Previous.is(Kind: tok::hash) && State.FirstIndent > 0 &&
784	&Previous == State.Line->First &&
785	(State.Line->Type == LT_PreprocessorDirective ||
786	State.Line->Type == LT_ImportStatement)) {
787	Spaces += State.FirstIndent;
788
789	// For preprocessor indent with tabs, State.Column will be 1 because of the
790	// hash. This causes second-level indents onward to have an extra space
791	// after the tabs. We avoid this misalignment by subtracting 1 from the
792	// column value passed to replaceWhitespace().
793	if (Style.UseTab != FormatStyle::UT_Never)
794	PPColumnCorrection = -1;
795	}
796
797	if (!DryRun) {
798	Whitespaces.replaceWhitespace(Tok&: Current, /*Newlines=*/0, Spaces,
799	StartOfTokenColumn: State.Column + Spaces + PPColumnCorrection,
800	/*IsAligned=*/false, InPPDirective: State.Line->InMacroBody);
801	}
802
803	// If "BreakBeforeInheritanceComma" mode, don't break within the inheritance
804	// declaration unless there is multiple inheritance.
805	if (Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma &&
806	Current.is(TT: TT_InheritanceColon)) {
807	CurrentState.NoLineBreak = true;
808	}
809	if (Style.BreakInheritanceList == FormatStyle::BILS_AfterColon &&
810	Previous.is(TT: TT_InheritanceColon)) {
811	CurrentState.NoLineBreak = true;
812	}
813
814	if (Current.is(TT: TT_SelectorName) && !CurrentState.ObjCSelectorNameFound) {
815	unsigned MinIndent = std::max(
816	a: State.FirstIndent + Style.ContinuationIndentWidth, b: CurrentState.Indent);
817	unsigned FirstColonPos = State.Column + Spaces + Current.ColumnWidth;
818	if (Current.LongestObjCSelectorName == 0)
819	CurrentState.AlignColons = false;
820	else if (MinIndent + Current.LongestObjCSelectorName > FirstColonPos)
821	CurrentState.ColonPos = MinIndent + Current.LongestObjCSelectorName;
822	else
823	CurrentState.ColonPos = FirstColonPos;
824	}
825
826	// In "AlwaysBreak" or "BlockIndent" mode, enforce wrapping directly after the
827	// parenthesis by disallowing any further line breaks if there is no line
828	// break after the opening parenthesis. Don't break if it doesn't conserve
829	// columns.
830	auto IsOpeningBracket = [&](const FormatToken &Tok) {
831	auto IsStartOfBracedList = [&]() {
832	return Tok.is(Kind: tok::l_brace) && Tok.isNot(Kind: BK_Block) &&
833	Style.Cpp11BracedListStyle;
834	};
835	if (!Tok.isOneOf(K1: tok::l_paren, K2: TT_TemplateOpener, Ks: tok::l_square) &&
836	!IsStartOfBracedList()) {
837	return false;
838	}
839	if (!Tok.Previous)
840	return true;
841	if (Tok.Previous->isIf())
842	return Style.AlignAfterOpenBracket == FormatStyle::BAS_AlwaysBreak;
843	return !Tok.Previous->isOneOf(K1: TT_CastRParen, K2: tok::kw_for, Ks: tok::kw_while,
844	Ks: tok::kw_switch) &&
845	!(Style.isJavaScript() && Tok.Previous->is(II: Keywords.kw_await));
846	};
847	auto IsFunctionCallParen = [](const FormatToken &Tok) {
848	return Tok.is(Kind: tok::l_paren) && Tok.ParameterCount > 0 && Tok.Previous &&
849	Tok.Previous->is(Kind: tok::identifier);
850	};
851	auto IsInTemplateString = [this](const FormatToken &Tok) {
852	if (!Style.isJavaScript())
853	return false;
854	for (const auto *Prev = &Tok; Prev; Prev = Prev->Previous) {
855	if (Prev->is(TT: TT_TemplateString) && Prev->opensScope())
856	return true;
857	if (Prev->opensScope() ||
858	(Prev->is(TT: TT_TemplateString) && Prev->closesScope())) {
859	break;
860	}
861	}
862	return false;
863	};
864	// Identifies simple (no expression) one-argument function calls.
865	auto StartsSimpleOneArgList = [&](const FormatToken &TokAfterLParen) {
866	assert(TokAfterLParen.isNot(tok::comment) || TokAfterLParen.Next);
867	const auto &Tok =
868	TokAfterLParen.is(Kind: tok::comment) ? *TokAfterLParen.Next : TokAfterLParen;
869	if (!Tok.FakeLParens.empty() && Tok.FakeLParens.back() > prec::Unknown)
870	return false;
871	// Nested calls that involve `new` expressions also look like simple
872	// function calls, eg:
873	// - foo(new Bar())
874	// - foo(::new Bar())
875	if (Tok.is(Kind: tok::kw_new) || Tok.startsSequence(K1: tok::coloncolon, Tokens: tok::kw_new))
876	return true;
877	if (Tok.is(TT: TT_UnaryOperator) ||
878	(Style.isJavaScript() &&
879	Tok.isOneOf(K1: tok::ellipsis, K2: Keywords.kw_await))) {
880	return true;
881	}
882	const auto *Previous = Tok.Previous;
883	if (!Previous || (!Previous->isOneOf(K1: TT_FunctionDeclarationLParen,
884	K2: TT_LambdaDefinitionLParen) &&
885	!IsFunctionCallParen(*Previous))) {
886	return true;
887	}
888	if (IsOpeningBracket(Tok) || IsInTemplateString(Tok))
889	return true;
890	const auto *Next = Tok.Next;
891	return !Next || Next->isMemberAccess() ||
892	Next->is(TT: TT_FunctionDeclarationLParen) || IsFunctionCallParen(*Next);
893	};
894	if ((Style.AlignAfterOpenBracket == FormatStyle::BAS_AlwaysBreak ||
895	Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent) &&
896	IsOpeningBracket(Previous) && State.Column > getNewLineColumn(State) &&
897	// Don't do this for simple (no expressions) one-argument function calls
898	// as that feels like needlessly wasting whitespace, e.g.:
899	//
900	// caaaaaaaaaaaall(
901	// caaaaaaaaaaaall(
902	// caaaaaaaaaaaall(
903	// caaaaaaaaaaaaaaaaaaaaaaall(aaaaaaaaaaaaaa, aaaaaaaaa))));
904	// or
905	// caaaaaaaaaaaaaaaaaaaaal(
906	// new SomethingElseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee());
907	!StartsSimpleOneArgList(Current)) {
908	CurrentState.NoLineBreak = true;
909	}
910
911	if (Previous.is(TT: TT_TemplateString) && Previous.opensScope())
912	CurrentState.NoLineBreak = true;
913
914	// Align following lines within parentheses / brackets if configured.
915	// Note: This doesn't apply to macro expansion lines, which are MACRO( , , )
916	// with args as children of the '(' and ',' tokens. It does not make sense to
917	// align the commas with the opening paren.
918	if (Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign &&
919	!CurrentState.IsCSharpGenericTypeConstraint && Previous.opensScope() &&
920	Previous.isNot(Kind: TT_ObjCMethodExpr) && Previous.isNot(Kind: TT_RequiresClause) &&
921	Previous.isNot(Kind: TT_TableGenDAGArgOpener) &&
922	Previous.isNot(Kind: TT_TableGenDAGArgOpenerToBreak) &&
923	!(Current.MacroParent && Previous.MacroParent) &&
924	(Current.isNot(Kind: TT_LineComment) ||
925	Previous.isOneOf(K1: BK_BracedInit, K2: TT_VerilogMultiLineListLParen)) &&
926	!IsInTemplateString(Current)) {
927	CurrentState.Indent = State.Column + Spaces;
928	CurrentState.IsAligned = true;
929	}
930	if (CurrentState.AvoidBinPacking && startsNextParameter(Current, Style))
931	CurrentState.NoLineBreak = true;
932	if (mustBreakBinaryOperation(Current, Style))
933	CurrentState.NoLineBreak = true;
934
935	if (startsSegmentOfBuilderTypeCall(Tok: Current) &&
936	State.Column > getNewLineColumn(State)) {
937	CurrentState.ContainsUnwrappedBuilder = true;
938	}
939
940	if (Current.is(TT: TT_LambdaArrow) && Style.isJava())
941	CurrentState.NoLineBreak = true;
942	if (Current.isMemberAccess() && Previous.is(Kind: tok::r_paren) &&
943	(Previous.MatchingParen &&
944	(Previous.TotalLength - Previous.MatchingParen->TotalLength > 10))) {
945	// If there is a function call with long parameters, break before trailing
946	// calls. This prevents things like:
947	// EXPECT_CALL(SomeLongParameter).Times(
948	// 2);
949	// We don't want to do this for short parameters as they can just be
950	// indexes.
951	CurrentState.NoLineBreak = true;
952	}
953
954	// Don't allow the RHS of an operator to be split over multiple lines unless
955	// there is a line-break right after the operator.
956	// Exclude relational operators, as there, it is always more desirable to
957	// have the LHS 'left' of the RHS.
958	const FormatToken *P = Current.getPreviousNonComment();
959	if (Current.isNot(Kind: tok::comment) && P &&
960	(P->isOneOf(K1: TT_BinaryOperator, K2: tok::comma) ||
961	(P->is(TT: TT_ConditionalExpr) && P->is(Kind: tok::colon))) &&
962	!P->isOneOf(K1: TT_OverloadedOperator, K2: TT_CtorInitializerComma) &&
963	P->getPrecedence() != prec::Assignment &&
964	P->getPrecedence() != prec::Relational &&
965	P->getPrecedence() != prec::Spaceship) {
966	bool BreakBeforeOperator =
967	P->MustBreakBefore || P->is(Kind: tok::lessless) ||
968	(P->is(TT: TT_BinaryOperator) &&
969	Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None) ||
970	(P->is(TT: TT_ConditionalExpr) && Style.BreakBeforeTernaryOperators);
971	// Don't do this if there are only two operands. In these cases, there is
972	// always a nice vertical separation between them and the extra line break
973	// does not help.
974	bool HasTwoOperands = P->OperatorIndex == 0 && !P->NextOperator &&
975	P->isNot(Kind: TT_ConditionalExpr);
976	if ((!BreakBeforeOperator &&
977	!(HasTwoOperands &&
978	Style.AlignOperands != FormatStyle::OAS_DontAlign)) ||
979	(!CurrentState.LastOperatorWrapped && BreakBeforeOperator)) {
980	CurrentState.NoLineBreakInOperand = true;
981	}
982	}
983
984	State.Column += Spaces;
985	if (Current.isNot(Kind: tok::comment) && Previous.is(Kind: tok::l_paren) &&
986	Previous.Previous &&
987	(Previous.Previous->is(Kind: tok::kw_for) || Previous.Previous->isIf())) {
988	// Treat the condition inside an if as if it was a second function
989	// parameter, i.e. let nested calls have a continuation indent.
990	CurrentState.LastSpace = State.Column;
991	CurrentState.NestedBlockIndent = State.Column;
992	} else if (!Current.isOneOf(K1: tok::comment, K2: tok::caret) &&
993	((Previous.is(Kind: tok::comma) &&
994	Previous.isNot(Kind: TT_OverloadedOperator)) ||
995	(Previous.is(Kind: tok::colon) && Previous.is(TT: TT_ObjCMethodExpr)))) {
996	CurrentState.LastSpace = State.Column;
997	} else if (Previous.is(TT: TT_CtorInitializerColon) &&
998	(!Current.isTrailingComment() || Current.NewlinesBefore > 0) &&
999	Style.BreakConstructorInitializers ==
1000	FormatStyle::BCIS_AfterColon) {
1001	CurrentState.Indent = State.Column;
1002	CurrentState.LastSpace = State.Column;
1003	} else if (Previous.isOneOf(K1: TT_ConditionalExpr, K2: TT_CtorInitializerColon)) {
1004	CurrentState.LastSpace = State.Column;
1005	} else if (Previous.is(TT: TT_BinaryOperator) &&
1006	((Previous.getPrecedence() != prec::Assignment &&
1007	(Previous.isNot(Kind: tok::lessless) || Previous.OperatorIndex != 0 ||
1008	Previous.NextOperator)) ||
1009	Current.StartsBinaryExpression)) {
1010	// Indent relative to the RHS of the expression unless this is a simple
1011	// assignment without binary expression on the RHS.
1012	if (Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None)
1013	CurrentState.LastSpace = State.Column;
1014	} else if (Previous.is(TT: TT_InheritanceColon)) {
1015	CurrentState.Indent = State.Column;
1016	CurrentState.LastSpace = State.Column;
1017	} else if (Current.is(TT: TT_CSharpGenericTypeConstraintColon)) {
1018	CurrentState.ColonPos = State.Column;
1019	} else if (Previous.opensScope()) {
1020	// If a function has a trailing call, indent all parameters from the
1021	// opening parenthesis. This avoids confusing indents like:
1022	// OuterFunction(InnerFunctionCall( // break
1023	// ParameterToInnerFunction)) // break
1024	// .SecondInnerFunctionCall();
1025	if (Previous.MatchingParen) {
1026	const FormatToken *Next = Previous.MatchingParen->getNextNonComment();
1027	if (Next && Next->isMemberAccess() && State.Stack.size() > 1 &&
1028	State.Stack[State.Stack.size() - 2].CallContinuation == 0) {
1029	CurrentState.LastSpace = State.Column;
1030	}
1031	}
1032	}
1033	}
1034
1035	unsigned ContinuationIndenter::addTokenOnNewLine(LineState &State,
1036	bool DryRun) {
1037	FormatToken &Current = *State.NextToken;
1038	assert(State.NextToken->Previous);
1039	const FormatToken &Previous = *State.NextToken->Previous;
1040	auto &CurrentState = State.Stack.back();
1041
1042	// Extra penalty that needs to be added because of the way certain line
1043	// breaks are chosen.
1044	unsigned Penalty = 0;
1045
1046	const FormatToken *PreviousNonComment = Current.getPreviousNonComment();
1047	const FormatToken *NextNonComment = Previous.getNextNonComment();
1048	if (!NextNonComment)
1049	NextNonComment = &Current;
1050	// The first line break on any NestingLevel causes an extra penalty in order
1051	// prefer similar line breaks.
1052	if (!CurrentState.ContainsLineBreak)
1053	Penalty += 15;
1054	CurrentState.ContainsLineBreak = true;
1055
1056	Penalty += State.NextToken->SplitPenalty;
1057
1058	// Breaking before the first "<<" is generally not desirable if the LHS is
1059	// short. Also always add the penalty if the LHS is split over multiple lines
1060	// to avoid unnecessary line breaks that just work around this penalty.
1061	if (NextNonComment->is(Kind: tok::lessless) && CurrentState.FirstLessLess == 0 &&
1062	(State.Column <= Style.ColumnLimit / 3 ||
1063	CurrentState.BreakBeforeParameter)) {
1064	Penalty += Style.PenaltyBreakFirstLessLess;
1065	}
1066
1067	State.Column = getNewLineColumn(State);
1068
1069	// Add Penalty proportional to amount of whitespace away from FirstColumn
1070	// This tends to penalize several lines that are far-right indented,
1071	// and prefers a line-break prior to such a block, e.g:
1072	//
1073	// Constructor() :
1074	// member(value), looooooooooooooooong_member(
1075	// looooooooooong_call(param_1, param_2, param_3))
1076	// would then become
1077	// Constructor() :
1078	// member(value),
1079	// looooooooooooooooong_member(
1080	// looooooooooong_call(param_1, param_2, param_3))
1081	if (State.Column > State.FirstIndent) {
1082	Penalty +=
1083	Style.PenaltyIndentedWhitespace * (State.Column - State.FirstIndent);
1084	}
1085
1086	// Indent nested blocks relative to this column, unless in a very specific
1087	// JavaScript special case where:
1088	//
1089	// var loooooong_name =
1090	// function() {
1091	// // code
1092	// }
1093	//
1094	// is common and should be formatted like a free-standing function. The same
1095	// goes for wrapping before the lambda return type arrow.
1096	if (Current.isNot(Kind: TT_LambdaArrow) &&
1097	(!Style.isJavaScript() || Current.NestingLevel != 0 ||
1098	!PreviousNonComment || PreviousNonComment->isNot(Kind: tok::equal) ||
1099	!Current.isOneOf(K1: Keywords.kw_async, K2: Keywords.kw_function))) {
1100	CurrentState.NestedBlockIndent = State.Column;
1101	}
1102
1103	if (NextNonComment->isMemberAccess()) {
1104	if (CurrentState.CallContinuation == 0)
1105	CurrentState.CallContinuation = State.Column;
1106	} else if (NextNonComment->is(TT: TT_SelectorName)) {
1107	if (!CurrentState.ObjCSelectorNameFound) {
1108	if (NextNonComment->LongestObjCSelectorName == 0) {
1109	CurrentState.AlignColons = false;
1110	} else {
1111	CurrentState.ColonPos =
1112	(shouldIndentWrappedSelectorName(Style, LineType: State.Line->Type)
1113	? std::max(a: CurrentState.Indent,
1114	b: State.FirstIndent + Style.ContinuationIndentWidth)
1115	: CurrentState.Indent) +
1116	std::max(a: NextNonComment->LongestObjCSelectorName,
1117	b: NextNonComment->ColumnWidth);
1118	}
1119	} else if (CurrentState.AlignColons &&
1120	CurrentState.ColonPos <= NextNonComment->ColumnWidth) {
1121	CurrentState.ColonPos = State.Column + NextNonComment->ColumnWidth;
1122	}
1123	} else if (PreviousNonComment && PreviousNonComment->is(Kind: tok::colon) &&
1124	PreviousNonComment->isOneOf(K1: TT_ObjCMethodExpr, K2: TT_DictLiteral)) {
1125	// FIXME: This is hacky, find a better way. The problem is that in an ObjC
1126	// method expression, the block should be aligned to the line starting it,
1127	// e.g.:
1128	// [aaaaaaaaaaaaaaa aaaaaaaaa: \\ break for some reason
1129	// ^(int *i) {
1130	// // ...
1131	// }];
1132	// Thus, we set LastSpace of the next higher NestingLevel, to which we move
1133	// when we consume all of the "}"'s FakeRParens at the "{".
1134	if (State.Stack.size() > 1) {
1135	State.Stack[State.Stack.size() - 2].LastSpace =
1136	std::max(a: CurrentState.LastSpace, b: CurrentState.Indent) +
1137	Style.ContinuationIndentWidth;
1138	}
1139	}
1140
1141	if ((PreviousNonComment &&
1142	PreviousNonComment->isOneOf(K1: tok::comma, K2: tok::semi) &&
1143	!CurrentState.AvoidBinPacking) ||
1144	Previous.is(TT: TT_BinaryOperator)) {
1145	CurrentState.BreakBeforeParameter = false;
1146	}
1147	if (PreviousNonComment &&
1148	(PreviousNonComment->isOneOf(K1: TT_TemplateCloser, K2: TT_JavaAnnotation) ||
1149	PreviousNonComment->ClosesRequiresClause) &&
1150	Current.NestingLevel == 0) {
1151	CurrentState.BreakBeforeParameter = false;
1152	}
1153	if (NextNonComment->is(Kind: tok::question) ||
1154	(PreviousNonComment && PreviousNonComment->is(Kind: tok::question))) {
1155	CurrentState.BreakBeforeParameter = true;
1156	}
1157	if (Current.is(TT: TT_BinaryOperator) && Current.CanBreakBefore)
1158	CurrentState.BreakBeforeParameter = false;
1159
1160	if (!DryRun) {
1161	unsigned MaxEmptyLinesToKeep = Style.MaxEmptyLinesToKeep + 1;
1162	if (Current.is(Kind: tok::r_brace) && Current.MatchingParen &&
1163	// Only strip trailing empty lines for l_braces that have children, i.e.
1164	// for function expressions (lambdas, arrows, etc).
1165	!Current.MatchingParen->Children.empty()) {
1166	// lambdas and arrow functions are expressions, thus their r_brace is not
1167	// on its own line, and thus not covered by UnwrappedLineFormatter's logic
1168	// about removing empty lines on closing blocks. Special case them here.
1169	MaxEmptyLinesToKeep = 1;
1170	}
1171	unsigned Newlines =
1172	std::max(a: 1u, b: std::min(a: Current.NewlinesBefore, b: MaxEmptyLinesToKeep));
1173	bool ContinuePPDirective =
1174	State.Line->InPPDirective && State.Line->Type != LT_ImportStatement;
1175	Whitespaces.replaceWhitespace(Tok&: Current, Newlines, Spaces: State.Column, StartOfTokenColumn: State.Column,
1176	IsAligned: CurrentState.IsAligned, InPPDirective: ContinuePPDirective);
1177	}
1178
1179	if (!Current.isTrailingComment())
1180	CurrentState.LastSpace = State.Column;
1181	if (Current.is(Kind: tok::lessless)) {
1182	// If we are breaking before a "<<", we always want to indent relative to
1183	// RHS. This is necessary only for "<<", as we special-case it and don't
1184	// always indent relative to the RHS.
1185	CurrentState.LastSpace += 3; // 3 -> width of "<< ".
1186	}
1187
1188	State.StartOfLineLevel = Current.NestingLevel;
1189	State.LowestLevelOnLine = Current.NestingLevel;
1190
1191	// Any break on this level means that the parent level has been broken
1192	// and we need to avoid bin packing there.
1193	bool NestedBlockSpecialCase =
1194	(!Style.isCpp() && Current.is(Kind: tok::r_brace) && State.Stack.size() > 1 &&
1195	State.Stack[State.Stack.size() - 2].NestedBlockInlined) ||
1196	(Style.Language == FormatStyle::LK_ObjC && Current.is(Kind: tok::r_brace) &&
1197	State.Stack.size() > 1 && !Style.ObjCBreakBeforeNestedBlockParam);
1198	// Do not force parameter break for statements with requires expressions.
1199	NestedBlockSpecialCase =
1200	NestedBlockSpecialCase ||
1201	(Current.MatchingParen &&
1202	Current.MatchingParen->is(TT: TT_RequiresExpressionLBrace));
1203	if (!NestedBlockSpecialCase) {
1204	auto ParentLevelIt = std::next(x: State.Stack.rbegin());
1205	if (Style.LambdaBodyIndentation == FormatStyle::LBI_OuterScope &&
1206	Current.MatchingParen && Current.MatchingParen->is(TT: TT_LambdaLBrace)) {
1207	// If the first character on the new line is a lambda's closing brace, the
1208	// stack still contains that lambda's parenthesis. As such, we need to
1209	// recurse further down the stack than usual to find the parenthesis level
1210	// containing the lambda, which is where we want to set
1211	// BreakBeforeParameter.
1212	//
1213	// We specifically special case "OuterScope"-formatted lambdas here
1214	// because, when using that setting, breaking before the parameter
1215	// directly following the lambda is particularly unsightly. However, when
1216	// "OuterScope" is not set, the logic to find the parent parenthesis level
1217	// still appears to be sometimes incorrect. It has not been fixed yet
1218	// because it would lead to significant changes in existing behaviour.
1219	//
1220	// TODO: fix the non-"OuterScope" case too.
1221	auto FindCurrentLevel = [&](const auto &It) {
1222	return std::find_if(It, State.Stack.rend(), [](const auto &PState) {
1223	return PState.Tok != nullptr; // Ignore fake parens.
1224	});
1225	};
1226	auto MaybeIncrement = [&](const auto &It) {
1227	return It != State.Stack.rend() ? std::next(It) : It;
1228	};
1229	auto LambdaLevelIt = FindCurrentLevel(State.Stack.rbegin());
1230	auto LevelContainingLambdaIt =
1231	FindCurrentLevel(MaybeIncrement(LambdaLevelIt));
1232	ParentLevelIt = MaybeIncrement(LevelContainingLambdaIt);
1233	}
1234	for (auto I = ParentLevelIt, E = State.Stack.rend(); I != E; ++I)
1235	I->BreakBeforeParameter = true;
1236	}
1237
1238	if (PreviousNonComment &&
1239	!PreviousNonComment->isOneOf(K1: tok::comma, K2: tok::colon, Ks: tok::semi) &&
1240	((PreviousNonComment->isNot(Kind: TT_TemplateCloser) &&
1241	!PreviousNonComment->ClosesRequiresClause) ||
1242	Current.NestingLevel != 0) &&
1243	!PreviousNonComment->isOneOf(
1244	K1: TT_BinaryOperator, K2: TT_FunctionAnnotationRParen, Ks: TT_JavaAnnotation,
1245	Ks: TT_LeadingJavaAnnotation) &&
1246	Current.isNot(Kind: TT_BinaryOperator) && !PreviousNonComment->opensScope() &&
1247	// We don't want to enforce line breaks for subsequent arguments just
1248	// because we have been forced to break before a lambda body.
1249	(!Style.BraceWrapping.BeforeLambdaBody ||
1250	Current.isNot(Kind: TT_LambdaLBrace))) {
1251	CurrentState.BreakBeforeParameter = true;
1252	}
1253
1254	// If we break after { or the [ of an array initializer, we should also break
1255	// before the corresponding } or ].
1256	if (PreviousNonComment &&
1257	(PreviousNonComment->isOneOf(K1: tok::l_brace, K2: TT_ArrayInitializerLSquare) ||
1258	opensProtoMessageField(LessTok: *PreviousNonComment, Style))) {
1259	CurrentState.BreakBeforeClosingBrace = true;
1260	}
1261
1262	if (PreviousNonComment && PreviousNonComment->is(Kind: tok::l_paren)) {
1263	CurrentState.BreakBeforeClosingParen =
1264	Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent;
1265	}
1266
1267	if (PreviousNonComment && PreviousNonComment->is(TT: TT_TemplateOpener))
1268	CurrentState.BreakBeforeClosingAngle = Style.BreakBeforeTemplateCloser;
1269
1270	if (CurrentState.AvoidBinPacking) {
1271	// If we are breaking after '(', '{', '<', or this is the break after a ':'
1272	// to start a member initializer list in a constructor, this should not
1273	// be considered bin packing unless the relevant AllowAll option is false or
1274	// this is a dict/object literal.
1275	bool PreviousIsBreakingCtorInitializerColon =
1276	PreviousNonComment && PreviousNonComment->is(TT: TT_CtorInitializerColon) &&
1277	Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
1278	bool AllowAllConstructorInitializersOnNextLine =
1279	Style.PackConstructorInitializers == FormatStyle::PCIS_NextLine ||
1280	Style.PackConstructorInitializers == FormatStyle::PCIS_NextLineOnly;
1281	if (!(Previous.isOneOf(K1: tok::l_paren, K2: tok::l_brace, Ks: TT_BinaryOperator) ||
1282	PreviousIsBreakingCtorInitializerColon) ||
1283	(!Style.AllowAllParametersOfDeclarationOnNextLine &&
1284	State.Line->MustBeDeclaration) ||
1285	(!Style.AllowAllArgumentsOnNextLine &&
1286	!State.Line->MustBeDeclaration) ||
1287	(!AllowAllConstructorInitializersOnNextLine &&
1288	PreviousIsBreakingCtorInitializerColon) ||
1289	Previous.is(TT: TT_DictLiteral)) {
1290	CurrentState.BreakBeforeParameter = true;
1291	}
1292
1293	// If we are breaking after a ':' to start a member initializer list,
1294	// and we allow all arguments on the next line, we should not break
1295	// before the next parameter.
1296	if (PreviousIsBreakingCtorInitializerColon &&
1297	AllowAllConstructorInitializersOnNextLine) {
1298	CurrentState.BreakBeforeParameter = false;
1299	}
1300	}
1301
1302	if (mustBreakBinaryOperation(Current, Style))
1303	CurrentState.BreakBeforeParameter = true;
1304
1305	return Penalty;
1306	}
1307
1308	unsigned ContinuationIndenter::getNewLineColumn(const LineState &State) {
1309	if (!State.NextToken || !State.NextToken->Previous)
1310	return 0;
1311
1312	FormatToken &Current = *State.NextToken;
1313	const auto &CurrentState = State.Stack.back();
1314
1315	if (CurrentState.IsCSharpGenericTypeConstraint &&
1316	Current.isNot(Kind: TT_CSharpGenericTypeConstraint)) {
1317	return CurrentState.ColonPos + 2;
1318	}
1319
1320	const FormatToken &Previous = *Current.Previous;
1321	// If we are continuing an expression, we want to use the continuation indent.
1322	unsigned ContinuationIndent =
1323	std::max(a: CurrentState.LastSpace, b: CurrentState.Indent) +
1324	Style.ContinuationIndentWidth;
1325	const FormatToken *PreviousNonComment = Current.getPreviousNonComment();
1326	const FormatToken *NextNonComment = Previous.getNextNonComment();
1327	if (!NextNonComment)
1328	NextNonComment = &Current;
1329
1330	// Java specific bits.
1331	if (Style.isJava() &&
1332	Current.isOneOf(K1: Keywords.kw_implements, K2: Keywords.kw_extends)) {
1333	return std::max(a: CurrentState.LastSpace,
1334	b: CurrentState.Indent + Style.ContinuationIndentWidth);
1335	}
1336
1337	// Indentation of the statement following a Verilog case label is taken care
1338	// of in moveStateToNextToken.
1339	if (Style.isVerilog() && PreviousNonComment &&
1340	Keywords.isVerilogEndOfLabel(Tok: *PreviousNonComment)) {
1341	return State.FirstIndent;
1342	}
1343
1344	if (Style.BreakBeforeBraces == FormatStyle::BS_Whitesmiths &&
1345	State.Line->First->is(Kind: tok::kw_enum)) {
1346	return (Style.IndentWidth * State.Line->First->IndentLevel) +
1347	Style.IndentWidth;
1348	}
1349
1350	if (Style.BraceWrapping.BeforeLambdaBody &&
1351	Style.BraceWrapping.IndentBraces && Current.is(TT: TT_LambdaLBrace)) {
1352	const auto From = Style.LambdaBodyIndentation == FormatStyle::LBI_Signature
1353	? CurrentState.Indent
1354	: State.FirstIndent;
1355	return From + Style.IndentWidth;
1356	}
1357
1358	if ((NextNonComment->is(Kind: tok::l_brace) && NextNonComment->is(BBK: BK_Block)) ||
1359	(Style.isVerilog() && Keywords.isVerilogBegin(Tok: *NextNonComment))) {
1360	if (Current.NestingLevel == 0 ||
1361	(Style.LambdaBodyIndentation == FormatStyle::LBI_OuterScope &&
1362	State.NextToken->is(TT: TT_LambdaLBrace))) {
1363	return State.FirstIndent;
1364	}
1365	return CurrentState.Indent;
1366	}
1367	if (Current.is(TT: TT_LambdaArrow) &&
1368	Previous.isOneOf(K1: tok::kw_noexcept, K2: tok::kw_mutable, Ks: tok::kw_constexpr,
1369	Ks: tok::kw_consteval, Ks: tok::kw_static, Ks: TT_AttributeSquare)) {
1370	return ContinuationIndent;
1371	}
1372	if ((Current.isOneOf(K1: tok::r_brace, K2: tok::r_square) ||
1373	(Current.is(Kind: tok::greater) && (Style.isProto() || Style.isTableGen()))) &&
1374	State.Stack.size() > 1) {
1375	if (Current.closesBlockOrBlockTypeList(Style))
1376	return State.Stack[State.Stack.size() - 2].NestedBlockIndent;
1377	if (Current.MatchingParen && Current.MatchingParen->is(BBK: BK_BracedInit))
1378	return State.Stack[State.Stack.size() - 2].LastSpace;
1379	return State.FirstIndent;
1380	}
1381	// Indent a closing parenthesis at the previous level if followed by a semi,
1382	// const, or opening brace. This allows indentations such as:
1383	// foo(
1384	// a,
1385	// );
1386	// int Foo::getter(
1387	// //
1388	// ) const {
1389	// return foo;
1390	// }
1391	// function foo(
1392	// a,
1393	// ) {
1394	// code(); //
1395	// }
1396	if (Current.is(Kind: tok::r_paren) && State.Stack.size() > 1 &&
1397	(!Current.Next ||
1398	Current.Next->isOneOf(K1: tok::semi, K2: tok::kw_const, Ks: tok::l_brace))) {
1399	return State.Stack[State.Stack.size() - 2].LastSpace;
1400	}
1401	// When DAGArg closer exists top of line, it should be aligned in the similar
1402	// way as function call above.
1403	if (Style.isTableGen() && Current.is(TT: TT_TableGenDAGArgCloser) &&
1404	State.Stack.size() > 1) {
1405	return State.Stack[State.Stack.size() - 2].LastSpace;
1406	}
1407	if (Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent &&
1408	(Current.is(Kind: tok::r_paren) ||
1409	(Current.is(Kind: tok::r_brace) && Current.MatchingParen &&
1410	Current.MatchingParen->is(BBK: BK_BracedInit))) &&
1411	State.Stack.size() > 1) {
1412	return State.Stack[State.Stack.size() - 2].LastSpace;
1413	}
1414	if (Style.BreakBeforeTemplateCloser && Current.is(TT: TT_TemplateCloser) &&
1415	State.Stack.size() > 1) {
1416	return State.Stack[State.Stack.size() - 2].LastSpace;
1417	}
1418	if (NextNonComment->is(TT: TT_TemplateString) && NextNonComment->closesScope())
1419	return State.Stack[State.Stack.size() - 2].LastSpace;
1420	// Field labels in a nested type should be aligned to the brace. For example
1421	// in ProtoBuf:
1422	// optional int32 b = 2 [(foo_options) = {aaaaaaaaaaaaaaaaaaa: 123,
1423	// bbbbbbbbbbbbbbbbbbbbbbbb:"baz"}];
1424	// For Verilog, a quote following a brace is treated as an identifier. And
1425	// Both braces and colons get annotated as TT_DictLiteral. So we have to
1426	// check.
1427	if (Current.is(Kind: tok::identifier) && Current.Next &&
1428	(!Style.isVerilog() || Current.Next->is(Kind: tok::colon)) &&
1429	(Current.Next->is(TT: TT_DictLiteral) ||
1430	(Style.isProto() && Current.Next->isOneOf(K1: tok::less, K2: tok::l_brace)))) {
1431	return CurrentState.Indent;
1432	}
1433	if (NextNonComment->is(TT: TT_ObjCStringLiteral) &&
1434	State.StartOfStringLiteral != 0) {
1435	return State.StartOfStringLiteral - 1;
1436	}
1437	if (NextNonComment->isStringLiteral() && State.StartOfStringLiteral != 0)
1438	return State.StartOfStringLiteral;
1439	if (NextNonComment->is(Kind: tok::lessless) && CurrentState.FirstLessLess != 0)
1440	return CurrentState.FirstLessLess;
1441	if (NextNonComment->isMemberAccess()) {
1442	if (CurrentState.CallContinuation == 0)
1443	return ContinuationIndent;
1444	return CurrentState.CallContinuation;
1445	}
1446	if (CurrentState.QuestionColumn != 0 &&
1447	((NextNonComment->is(Kind: tok::colon) &&
1448	NextNonComment->is(TT: TT_ConditionalExpr)) ||
1449	Previous.is(TT: TT_ConditionalExpr))) {
1450	if (((NextNonComment->is(Kind: tok::colon) && NextNonComment->Next &&
1451	!NextNonComment->Next->FakeLParens.empty() &&
1452	NextNonComment->Next->FakeLParens.back() == prec::Conditional) ||
1453	(Previous.is(Kind: tok::colon) && !Current.FakeLParens.empty() &&
1454	Current.FakeLParens.back() == prec::Conditional)) &&
1455	!CurrentState.IsWrappedConditional) {
1456	// NOTE: we may tweak this slightly:
1457	// * not remove the 'lead' ContinuationIndentWidth
1458	// * always un-indent by the operator when
1459	// BreakBeforeTernaryOperators=true
1460	unsigned Indent = CurrentState.Indent;
1461	if (Style.AlignOperands != FormatStyle::OAS_DontAlign)
1462	Indent -= Style.ContinuationIndentWidth;
1463	if (Style.BreakBeforeTernaryOperators && CurrentState.UnindentOperator)
1464	Indent -= 2;
1465	return Indent;
1466	}
1467	return CurrentState.QuestionColumn;
1468	}
1469	if (Previous.is(Kind: tok::comma) && CurrentState.VariablePos != 0)
1470	return CurrentState.VariablePos;
1471	if (Current.is(TT: TT_RequiresClause)) {
1472	if (Style.IndentRequiresClause)
1473	return CurrentState.Indent + Style.IndentWidth;
1474	switch (Style.RequiresClausePosition) {
1475	case FormatStyle::RCPS_OwnLine:
1476	case FormatStyle::RCPS_WithFollowing:
1477	case FormatStyle::RCPS_OwnLineWithBrace:
1478	return CurrentState.Indent;
1479	default:
1480	break;
1481	}
1482	}
1483	if (NextNonComment->isOneOf(K1: TT_CtorInitializerColon, K2: TT_InheritanceColon,
1484	Ks: TT_InheritanceComma)) {
1485	return State.FirstIndent + Style.ConstructorInitializerIndentWidth;
1486	}
1487	if ((PreviousNonComment &&
1488	(PreviousNonComment->ClosesTemplateDeclaration ||
1489	PreviousNonComment->ClosesRequiresClause ||
1490	(PreviousNonComment->is(TT: TT_AttributeMacro) &&
1491	Current.isNot(Kind: tok::l_paren) &&
1492	!Current.endsSequence(K1: TT_StartOfName, Tokens: TT_AttributeMacro,
1493	Tokens: TT_PointerOrReference)) ||
1494	PreviousNonComment->isOneOf(
1495	K1: TT_AttributeRParen, K2: TT_AttributeSquare, Ks: TT_FunctionAnnotationRParen,
1496	Ks: TT_JavaAnnotation, Ks: TT_LeadingJavaAnnotation))) ||
1497	(!Style.IndentWrappedFunctionNames &&
1498	NextNonComment->isOneOf(K1: tok::kw_operator, K2: TT_FunctionDeclarationName))) {
1499	return std::max(a: CurrentState.LastSpace, b: CurrentState.Indent);
1500	}
1501	if (NextNonComment->is(TT: TT_SelectorName)) {
1502	if (!CurrentState.ObjCSelectorNameFound) {
1503	unsigned MinIndent = CurrentState.Indent;
1504	if (shouldIndentWrappedSelectorName(Style, LineType: State.Line->Type)) {
1505	MinIndent = std::max(a: MinIndent,
1506	b: State.FirstIndent + Style.ContinuationIndentWidth);
1507	}
1508	// If LongestObjCSelectorName is 0, we are indenting the first
1509	// part of an ObjC selector (or a selector component which is
1510	// not colon-aligned due to block formatting).
1511	//
1512	// Otherwise, we are indenting a subsequent part of an ObjC
1513	// selector which should be colon-aligned to the longest
1514	// component of the ObjC selector.
1515	//
1516	// In either case, we want to respect Style.IndentWrappedFunctionNames.
1517	return MinIndent +
1518	std::max(a: NextNonComment->LongestObjCSelectorName,
1519	b: NextNonComment->ColumnWidth) -
1520	NextNonComment->ColumnWidth;
1521	}
1522	if (!CurrentState.AlignColons)
1523	return CurrentState.Indent;
1524	if (CurrentState.ColonPos > NextNonComment->ColumnWidth)
1525	return CurrentState.ColonPos - NextNonComment->ColumnWidth;
1526	return CurrentState.Indent;
1527	}
1528	if (NextNonComment->is(Kind: tok::colon) && NextNonComment->is(TT: TT_ObjCMethodExpr))
1529	return CurrentState.ColonPos;
1530	if (NextNonComment->is(TT: TT_ArraySubscriptLSquare)) {
1531	if (CurrentState.StartOfArraySubscripts != 0) {
1532	return CurrentState.StartOfArraySubscripts;
1533	} else if (Style.isCSharp()) { // C# allows `["key"] = value` inside object
1534	// initializers.
1535	return CurrentState.Indent;
1536	}
1537	return ContinuationIndent;
1538	}
1539
1540	// OpenMP clauses want to get additional indentation when they are pushed onto
1541	// the next line.
1542	if (State.Line->InPragmaDirective) {
1543	FormatToken *PragmaType = State.Line->First->Next->Next;
1544	if (PragmaType && PragmaType->TokenText == "omp")
1545	return CurrentState.Indent + Style.ContinuationIndentWidth;
1546	}
1547
1548	// This ensure that we correctly format ObjC methods calls without inputs,
1549	// i.e. where the last element isn't selector like: [callee method];
1550	if (NextNonComment->is(Kind: tok::identifier) && NextNonComment->FakeRParens == 0 &&
1551	NextNonComment->Next && NextNonComment->Next->is(TT: TT_ObjCMethodExpr)) {
1552	return CurrentState.Indent;
1553	}
1554
1555	if (NextNonComment->isOneOf(K1: TT_StartOfName, K2: TT_PointerOrReference) ||
1556	Previous.isOneOf(K1: tok::coloncolon, K2: tok::equal, Ks: TT_JsTypeColon)) {
1557	return ContinuationIndent;
1558	}
1559	if (PreviousNonComment && PreviousNonComment->is(Kind: tok::colon) &&
1560	PreviousNonComment->isOneOf(K1: TT_ObjCMethodExpr, K2: TT_DictLiteral)) {
1561	return ContinuationIndent;
1562	}
1563	if (NextNonComment->is(TT: TT_CtorInitializerComma))
1564	return CurrentState.Indent;
1565	if (PreviousNonComment && PreviousNonComment->is(TT: TT_CtorInitializerColon) &&
1566	Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon) {
1567	return CurrentState.Indent;
1568	}
1569	if (PreviousNonComment && PreviousNonComment->is(TT: TT_InheritanceColon) &&
1570	Style.BreakInheritanceList == FormatStyle::BILS_AfterColon) {
1571	return CurrentState.Indent;
1572	}
1573	if (Previous.is(Kind: tok::r_paren) &&
1574	Previous.isNot(Kind: TT_TableGenDAGArgOperatorToBreak) &&
1575	!Current.isBinaryOperator() &&
1576	!Current.isOneOf(K1: tok::colon, K2: tok::comment)) {
1577	return ContinuationIndent;
1578	}
1579	if (Current.is(TT: TT_ProtoExtensionLSquare))
1580	return CurrentState.Indent;
1581	if (Current.isBinaryOperator() && CurrentState.UnindentOperator) {
1582	return CurrentState.Indent - Current.Tok.getLength() -
1583	Current.SpacesRequiredBefore;
1584	}
1585	if (Current.is(Kind: tok::comment) && NextNonComment->isBinaryOperator() &&
1586	CurrentState.UnindentOperator) {
1587	return CurrentState.Indent - NextNonComment->Tok.getLength() -
1588	NextNonComment->SpacesRequiredBefore;
1589	}
1590	if (CurrentState.Indent == State.FirstIndent && PreviousNonComment &&
1591	!PreviousNonComment->isOneOf(K1: tok::r_brace, K2: TT_CtorInitializerComma)) {
1592	// Ensure that we fall back to the continuation indent width instead of
1593	// just flushing continuations left.
1594	return CurrentState.Indent + Style.ContinuationIndentWidth;
1595	}
1596	return CurrentState.Indent;
1597	}
1598
1599	static bool hasNestedBlockInlined(const FormatToken *Previous,
1600	const FormatToken &Current,
1601	const FormatStyle &Style) {
1602	if (Previous->isNot(Kind: tok::l_paren))
1603	return true;
1604	if (Previous->ParameterCount > 1)
1605	return true;
1606
1607	// Also a nested block if contains a lambda inside function with 1 parameter.
1608	return Style.BraceWrapping.BeforeLambdaBody && Current.is(TT: TT_LambdaLSquare);
1609	}
1610
1611	unsigned ContinuationIndenter::moveStateToNextToken(LineState &State,
1612	bool DryRun, bool Newline) {
1613	assert(State.Stack.size());
1614	const FormatToken &Current = *State.NextToken;
1615	auto &CurrentState = State.Stack.back();
1616
1617	if (Current.is(TT: TT_CSharpGenericTypeConstraint))
1618	CurrentState.IsCSharpGenericTypeConstraint = true;
1619	if (Current.isOneOf(K1: tok::comma, K2: TT_BinaryOperator))
1620	CurrentState.NoLineBreakInOperand = false;
1621	if (Current.isOneOf(K1: TT_InheritanceColon, K2: TT_CSharpGenericTypeConstraintColon))
1622	CurrentState.AvoidBinPacking = true;
1623	if (Current.is(Kind: tok::lessless) && Current.isNot(Kind: TT_OverloadedOperator)) {
1624	if (CurrentState.FirstLessLess == 0)
1625	CurrentState.FirstLessLess = State.Column;
1626	else
1627	CurrentState.LastOperatorWrapped = Newline;
1628	}
1629	if (Current.is(TT: TT_BinaryOperator) && Current.isNot(Kind: tok::lessless))
1630	CurrentState.LastOperatorWrapped = Newline;
1631	if (Current.is(TT: TT_ConditionalExpr) && Current.Previous &&
1632	Current.Previous->isNot(Kind: TT_ConditionalExpr)) {
1633	CurrentState.LastOperatorWrapped = Newline;
1634	}
1635	if (Current.is(TT: TT_ArraySubscriptLSquare) &&
1636	CurrentState.StartOfArraySubscripts == 0) {
1637	CurrentState.StartOfArraySubscripts = State.Column;
1638	}
1639
1640	auto IsWrappedConditional = [](const FormatToken &Tok) {
1641	if (!(Tok.is(TT: TT_ConditionalExpr) && Tok.is(Kind: tok::question)))
1642	return false;
1643	if (Tok.MustBreakBefore)
1644	return true;
1645
1646	const FormatToken *Next = Tok.getNextNonComment();
1647	return Next && Next->MustBreakBefore;
1648	};
1649	if (IsWrappedConditional(Current))
1650	CurrentState.IsWrappedConditional = true;
1651	if (Style.BreakBeforeTernaryOperators && Current.is(Kind: tok::question))
1652	CurrentState.QuestionColumn = State.Column;
1653	if (!Style.BreakBeforeTernaryOperators && Current.isNot(Kind: tok::colon)) {
1654	const FormatToken *Previous = Current.Previous;
1655	while (Previous && Previous->isTrailingComment())
1656	Previous = Previous->Previous;
1657	if (Previous && Previous->is(Kind: tok::question))
1658	CurrentState.QuestionColumn = State.Column;
1659	}
1660	if (!Current.opensScope() && !Current.closesScope() &&
1661	Current.isNot(Kind: TT_PointerOrReference)) {
1662	State.LowestLevelOnLine =
1663	std::min(a: State.LowestLevelOnLine, b: Current.NestingLevel);
1664	}
1665	if (Current.isMemberAccess())
1666	CurrentState.StartOfFunctionCall = !Current.NextOperator ? 0 : State.Column;
1667	if (Current.is(TT: TT_SelectorName))
1668	CurrentState.ObjCSelectorNameFound = true;
1669	if (Current.is(TT: TT_CtorInitializerColon) &&
1670	Style.BreakConstructorInitializers != FormatStyle::BCIS_AfterColon) {
1671	// Indent 2 from the column, so:
1672	// SomeClass::SomeClass()
1673	// : First(...), ...
1674	// Next(...)
1675	// ^ line up here.
1676	CurrentState.Indent = State.Column + (Style.BreakConstructorInitializers ==
1677	FormatStyle::BCIS_BeforeComma
1678	? 0
1679	: 2);
1680	CurrentState.NestedBlockIndent = CurrentState.Indent;
1681	if (Style.PackConstructorInitializers > FormatStyle::PCIS_BinPack) {
1682	CurrentState.AvoidBinPacking = true;
1683	CurrentState.BreakBeforeParameter =
1684	Style.ColumnLimit > 0 &&
1685	Style.PackConstructorInitializers != FormatStyle::PCIS_NextLine &&
1686	Style.PackConstructorInitializers != FormatStyle::PCIS_NextLineOnly;
1687	} else {
1688	CurrentState.BreakBeforeParameter = false;
1689	}
1690	}
1691	if (Current.is(TT: TT_CtorInitializerColon) &&
1692	Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon) {
1693	CurrentState.Indent =
1694	State.FirstIndent + Style.ConstructorInitializerIndentWidth;
1695	CurrentState.NestedBlockIndent = CurrentState.Indent;
1696	if (Style.PackConstructorInitializers > FormatStyle::PCIS_BinPack)
1697	CurrentState.AvoidBinPacking = true;
1698	else
1699	CurrentState.BreakBeforeParameter = false;
1700	}
1701	if (Current.is(TT: TT_InheritanceColon)) {
1702	CurrentState.Indent =
1703	State.FirstIndent + Style.ConstructorInitializerIndentWidth;
1704	}
1705	if (Current.isOneOf(K1: TT_BinaryOperator, K2: TT_ConditionalExpr) && Newline)
1706	CurrentState.NestedBlockIndent = State.Column + Current.ColumnWidth + 1;
1707	if (Current.isOneOf(K1: TT_LambdaLSquare, K2: TT_LambdaArrow))
1708	CurrentState.LastSpace = State.Column;
1709	if (Current.is(TT: TT_RequiresExpression) &&
1710	Style.RequiresExpressionIndentation == FormatStyle::REI_Keyword) {
1711	CurrentState.NestedBlockIndent = State.Column;
1712	}
1713
1714	// Insert scopes created by fake parenthesis.
1715	const FormatToken *Previous = Current.getPreviousNonComment();
1716
1717	// Add special behavior to support a format commonly used for JavaScript
1718	// closures:
1719	// SomeFunction(function() {
1720	// foo();
1721	// bar();
1722	// }, a, b, c);
1723	if (Current.isNot(Kind: tok::comment) && !Current.ClosesRequiresClause &&
1724	Previous && Previous->isOneOf(K1: tok::l_brace, K2: TT_ArrayInitializerLSquare) &&
1725	Previous->isNot(Kind: TT_DictLiteral) && State.Stack.size() > 1 &&
1726	!CurrentState.HasMultipleNestedBlocks) {
1727	if (State.Stack[State.Stack.size() - 2].NestedBlockInlined && Newline)
1728	for (ParenState &PState : llvm::drop_end(RangeOrContainer&: State.Stack))
1729	PState.NoLineBreak = true;
1730	State.Stack[State.Stack.size() - 2].NestedBlockInlined = false;
1731	}
1732	if (Previous && (Previous->isOneOf(K1: TT_BinaryOperator, K2: TT_ConditionalExpr) ||
1733	(Previous->isOneOf(K1: tok::l_paren, K2: tok::comma, Ks: tok::colon) &&
1734	!Previous->isOneOf(K1: TT_DictLiteral, K2: TT_ObjCMethodExpr)))) {
1735	CurrentState.NestedBlockInlined =
1736	!Newline && hasNestedBlockInlined(Previous, Current, Style);
1737	}
1738
1739	moveStatePastFakeLParens(State, Newline);
1740	moveStatePastScopeCloser(State);
1741	// Do not use CurrentState here, since the two functions before may change the
1742	// Stack.
1743	bool AllowBreak = !State.Stack.back().NoLineBreak &&
1744	!State.Stack.back().NoLineBreakInOperand;
1745	moveStatePastScopeOpener(State, Newline);
1746	moveStatePastFakeRParens(State);
1747
1748	if (Current.is(TT: TT_ObjCStringLiteral) && State.StartOfStringLiteral == 0)
1749	State.StartOfStringLiteral = State.Column + 1;
1750	if (Current.is(TT: TT_CSharpStringLiteral) && State.StartOfStringLiteral == 0) {
1751	State.StartOfStringLiteral = State.Column + 1;
1752	} else if (Current.is(TT: TT_TableGenMultiLineString) &&
1753	State.StartOfStringLiteral == 0) {
1754	State.StartOfStringLiteral = State.Column + 1;
1755	} else if (Current.isStringLiteral() && State.StartOfStringLiteral == 0) {
1756	State.StartOfStringLiteral = State.Column;
1757	} else if (!Current.isOneOf(K1: tok::comment, K2: tok::identifier, Ks: tok::hash) &&
1758	!Current.isStringLiteral()) {
1759	State.StartOfStringLiteral = 0;
1760	}
1761
1762	State.Column += Current.ColumnWidth;
1763	State.NextToken = State.NextToken->Next;
1764	// Verilog case labels are on the same unwrapped lines as the statements that
1765	// follow. TokenAnnotator identifies them and sets MustBreakBefore.
1766	// Indentation is taken care of here. A case label can only have 1 statement
1767	// in Verilog, so we don't have to worry about lines that follow.
1768	if (Style.isVerilog() && State.NextToken &&
1769	State.NextToken->MustBreakBefore &&
1770	Keywords.isVerilogEndOfLabel(Tok: Current)) {
1771	State.FirstIndent += Style.IndentWidth;
1772	CurrentState.Indent = State.FirstIndent;
1773	}
1774
1775	unsigned Penalty =
1776	handleEndOfLine(Current, State, DryRun, AllowBreak, Newline);
1777
1778	if (Current.Role)
1779	Current.Role->formatFromToken(State, Indenter: this, DryRun);
1780	// If the previous has a special role, let it consume tokens as appropriate.
1781	// It is necessary to start at the previous token for the only implemented
1782	// role (comma separated list). That way, the decision whether or not to break
1783	// after the "{" is already done and both options are tried and evaluated.
1784	// FIXME: This is ugly, find a better way.
1785	if (Previous && Previous->Role)
1786	Penalty += Previous->Role->formatAfterToken(State, Indenter: this, DryRun);
1787
1788	return Penalty;
1789	}
1790
1791	void ContinuationIndenter::moveStatePastFakeLParens(LineState &State,
1792	bool Newline) {
1793	const FormatToken &Current = *State.NextToken;
1794	if (Current.FakeLParens.empty())
1795	return;
1796
1797	const FormatToken *Previous = Current.getPreviousNonComment();
1798
1799	// Don't add extra indentation for the first fake parenthesis after
1800	// 'return', assignments, opening <({[, or requires clauses. The indentation
1801	// for these cases is special cased.
1802	bool SkipFirstExtraIndent =
1803	Previous &&
1804	(Previous->opensScope() ||
1805	Previous->isOneOf(K1: tok::semi, K2: tok::kw_return, Ks: TT_RequiresClause) ||
1806	(Previous->getPrecedence() == prec::Assignment &&
1807	Style.AlignOperands != FormatStyle::OAS_DontAlign) ||
1808	Previous->is(TT: TT_ObjCMethodExpr));
1809	for (const auto &PrecedenceLevel : llvm::reverse(C: Current.FakeLParens)) {
1810	const auto &CurrentState = State.Stack.back();
1811	ParenState NewParenState = CurrentState;
1812	NewParenState.Tok = nullptr;
1813	NewParenState.ContainsLineBreak = false;
1814	NewParenState.LastOperatorWrapped = true;
1815	NewParenState.IsChainedConditional = false;
1816	NewParenState.IsWrappedConditional = false;
1817	NewParenState.UnindentOperator = false;
1818	NewParenState.NoLineBreak =
1819	NewParenState.NoLineBreak || CurrentState.NoLineBreakInOperand;
1820
1821	// Don't propagate AvoidBinPacking into subexpressions of arg/param lists.
1822	if (PrecedenceLevel > prec::Comma)
1823	NewParenState.AvoidBinPacking = false;
1824
1825	// Indent from 'LastSpace' unless these are fake parentheses encapsulating
1826	// a builder type call after 'return' or, if the alignment after opening
1827	// brackets is disabled.
1828	if (!Current.isTrailingComment() &&
1829	(Style.AlignOperands != FormatStyle::OAS_DontAlign ||
1830	PrecedenceLevel < prec::Assignment) &&
1831	(!Previous || Previous->isNot(Kind: tok::kw_return) ||
1832	(!Style.isJava() && PrecedenceLevel > 0)) &&
1833	(Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign ||
1834	PrecedenceLevel > prec::Comma || Current.NestingLevel == 0) &&
1835	(!Style.isTableGen() ||
1836	(Previous && Previous->isOneOf(K1: TT_TableGenDAGArgListComma,
1837	K2: TT_TableGenDAGArgListCommaToBreak)))) {
1838	NewParenState.Indent = std::max(
1839	a: std::max(a: State.Column, b: NewParenState.Indent), b: CurrentState.LastSpace);
1840	}
1841
1842	// Special case for generic selection expressions, its comma-separated
1843	// expressions are not aligned to the opening paren like regular calls, but
1844	// rather continuation-indented relative to the _Generic keyword.
1845	if (Previous && Previous->endsSequence(K1: tok::l_paren, Tokens: tok::kw__Generic) &&
1846	State.Stack.size() > 1) {
1847	NewParenState.Indent = State.Stack[State.Stack.size() - 2].Indent +
1848	Style.ContinuationIndentWidth;
1849	}
1850
1851	if ((shouldUnindentNextOperator(Tok: Current) ||
1852	(Previous &&
1853	(PrecedenceLevel == prec::Conditional &&
1854	Previous->is(Kind: tok::question) && Previous->is(TT: TT_ConditionalExpr)))) &&
1855	!Newline) {
1856	// If BreakBeforeBinaryOperators is set, un-indent a bit to account for
1857	// the operator and keep the operands aligned.
1858	if (Style.AlignOperands == FormatStyle::OAS_AlignAfterOperator)
1859	NewParenState.UnindentOperator = true;
1860	// Mark indentation as alignment if the expression is aligned.
1861	if (Style.AlignOperands != FormatStyle::OAS_DontAlign)
1862	NewParenState.IsAligned = true;
1863	}
1864
1865	// Do not indent relative to the fake parentheses inserted for "." or "->".
1866	// This is a special case to make the following to statements consistent:
1867	// OuterFunction(InnerFunctionCall( // break
1868	// ParameterToInnerFunction));
1869	// OuterFunction(SomeObject.InnerFunctionCall( // break
1870	// ParameterToInnerFunction));
1871	if (PrecedenceLevel > prec::Unknown)
1872	NewParenState.LastSpace = std::max(a: NewParenState.LastSpace, b: State.Column);
1873	if (PrecedenceLevel != prec::Conditional &&
1874	Current.isNot(Kind: TT_UnaryOperator) &&
1875	Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign) {
1876	NewParenState.StartOfFunctionCall = State.Column;
1877	}
1878
1879	// Indent conditional expressions, unless they are chained "else-if"
1880	// conditionals. Never indent expression where the 'operator' is ',', ';' or
1881	// an assignment (i.e. *I <= prec::Assignment) as those have different
1882	// indentation rules. Indent other expression, unless the indentation needs
1883	// to be skipped.
1884	if (PrecedenceLevel == prec::Conditional && Previous &&
1885	Previous->is(Kind: tok::colon) && Previous->is(TT: TT_ConditionalExpr) &&
1886	&PrecedenceLevel == &Current.FakeLParens.back() &&
1887	!CurrentState.IsWrappedConditional) {
1888	NewParenState.IsChainedConditional = true;
1889	NewParenState.UnindentOperator = State.Stack.back().UnindentOperator;
1890	} else if (PrecedenceLevel == prec::Conditional ||
1891	(!SkipFirstExtraIndent && PrecedenceLevel > prec::Assignment &&
1892	!Current.isTrailingComment())) {
1893	NewParenState.Indent += Style.ContinuationIndentWidth;
1894	}
1895	if ((Previous && !Previous->opensScope()) || PrecedenceLevel != prec::Comma)
1896	NewParenState.BreakBeforeParameter = false;
1897	State.Stack.push_back(Elt: NewParenState);
1898	SkipFirstExtraIndent = false;
1899	}
1900	}
1901
1902	void ContinuationIndenter::moveStatePastFakeRParens(LineState &State) {
1903	for (unsigned i = 0, e = State.NextToken->FakeRParens; i != e; ++i) {
1904	unsigned VariablePos = State.Stack.back().VariablePos;
1905	if (State.Stack.size() == 1) {
1906	// Do not pop the last element.
1907	break;
1908	}
1909	State.Stack.pop_back();
1910	State.Stack.back().VariablePos = VariablePos;
1911	}
1912
1913	if (State.NextToken->ClosesRequiresClause && Style.IndentRequiresClause) {
1914	// Remove the indentation of the requires clauses (which is not in Indent,
1915	// but in LastSpace).
1916	State.Stack.back().LastSpace -= Style.IndentWidth;
1917	}
1918	}
1919
1920	void ContinuationIndenter::moveStatePastScopeOpener(LineState &State,
1921	bool Newline) {
1922	const FormatToken &Current = *State.NextToken;
1923	if (!Current.opensScope())
1924	return;
1925
1926	const auto &CurrentState = State.Stack.back();
1927
1928	// Don't allow '<' or '(' in C# generic type constraints to start new scopes.
1929	if (Current.isOneOf(K1: tok::less, K2: tok::l_paren) &&
1930	CurrentState.IsCSharpGenericTypeConstraint) {
1931	return;
1932	}
1933
1934	if (Current.MatchingParen && Current.is(BBK: BK_Block)) {
1935	moveStateToNewBlock(State, NewLine: Newline);
1936	return;
1937	}
1938
1939	const bool EndsInComma = [](const FormatToken *Tok) {
1940	if (!Tok)
1941	return false;
1942	const auto *Prev = Tok->getPreviousNonComment();
1943	if (!Prev)
1944	return false;
1945	return Prev->is(Kind: tok::comma);
1946	}(Current.MatchingParen);
1947
1948	unsigned NewIndent;
1949	unsigned LastSpace = CurrentState.LastSpace;
1950	bool AvoidBinPacking;
1951	bool BreakBeforeParameter = false;
1952	unsigned NestedBlockIndent = std::max(a: CurrentState.StartOfFunctionCall,
1953	b: CurrentState.NestedBlockIndent);
1954	if (Current.isOneOf(K1: tok::l_brace, K2: TT_ArrayInitializerLSquare) ||
1955	opensProtoMessageField(LessTok: Current, Style)) {
1956	if (Current.opensBlockOrBlockTypeList(Style)) {
1957	NewIndent = Style.IndentWidth +
1958	std::min(a: State.Column, b: CurrentState.NestedBlockIndent);
1959	} else if (Current.is(Kind: tok::l_brace)) {
1960	const auto Width = Style.BracedInitializerIndentWidth;
1961	NewIndent = CurrentState.LastSpace +
1962	(Width < 0 ? Style.ContinuationIndentWidth : Width);
1963	} else {
1964	NewIndent = CurrentState.LastSpace + Style.ContinuationIndentWidth;
1965	}
1966	const FormatToken *NextNonComment = Current.getNextNonComment();
1967	AvoidBinPacking = EndsInComma || Current.is(TT: TT_DictLiteral) ||
1968	Style.isProto() || !Style.BinPackArguments ||
1969	(NextNonComment && NextNonComment->isOneOf(
1970	K1: TT_DesignatedInitializerPeriod,
1971	K2: TT_DesignatedInitializerLSquare));
1972	BreakBeforeParameter = EndsInComma;
1973	if (Current.ParameterCount > 1)
1974	NestedBlockIndent = std::max(a: NestedBlockIndent, b: State.Column + 1);
1975	} else {
1976	NewIndent =
1977	Style.ContinuationIndentWidth +
1978	std::max(a: CurrentState.LastSpace, b: CurrentState.StartOfFunctionCall);
1979
1980	if (Style.isTableGen() && Current.is(TT: TT_TableGenDAGArgOpenerToBreak) &&
1981	Style.TableGenBreakInsideDAGArg == FormatStyle::DAS_BreakElements) {
1982	// For the case the next token is a TableGen DAGArg operator identifier
1983	// that is not marked to have a line break after it.
1984	// In this case the option DAS_BreakElements requires to align the
1985	// DAGArg elements to the operator.
1986	const FormatToken *Next = Current.Next;
1987	if (Next && Next->is(TT: TT_TableGenDAGArgOperatorID))
1988	NewIndent = State.Column + Next->TokenText.size() + 2;
1989	}
1990
1991	// Ensure that different different brackets force relative alignment, e.g.:
1992	// void SomeFunction(vector< // break
1993	// int> v);
1994	// FIXME: We likely want to do this for more combinations of brackets.
1995	if (Current.is(Kind: tok::less) && Current.ParentBracket == tok::l_paren) {
1996	NewIndent = std::max(a: NewIndent, b: CurrentState.Indent);
1997	LastSpace = std::max(a: LastSpace, b: CurrentState.Indent);
1998	}
1999
2000	// If ObjCBinPackProtocolList is unspecified, fall back to BinPackParameters
2001	// for backwards compatibility.
2002	bool ObjCBinPackProtocolList =
2003	(Style.ObjCBinPackProtocolList == FormatStyle::BPS_Auto &&
2004	Style.BinPackParameters == FormatStyle::BPPS_BinPack) ||
2005	Style.ObjCBinPackProtocolList == FormatStyle::BPS_Always;
2006
2007	bool BinPackDeclaration =
2008	(State.Line->Type != LT_ObjCDecl &&
2009	Style.BinPackParameters == FormatStyle::BPPS_BinPack) ||
2010	(State.Line->Type == LT_ObjCDecl && ObjCBinPackProtocolList);
2011
2012	bool GenericSelection =
2013	Current.getPreviousNonComment() &&
2014	Current.getPreviousNonComment()->is(Kind: tok::kw__Generic);
2015
2016	AvoidBinPacking =
2017	(CurrentState.IsCSharpGenericTypeConstraint) || GenericSelection ||
2018	(Style.isJavaScript() && EndsInComma) ||
2019	(State.Line->MustBeDeclaration && !BinPackDeclaration) ||
2020	(!State.Line->MustBeDeclaration && !Style.BinPackArguments) ||
2021	(Style.ExperimentalAutoDetectBinPacking &&
2022	(Current.is(PPK: PPK_OnePerLine) ||
2023	(!BinPackInconclusiveFunctions && Current.is(PPK: PPK_Inconclusive))));
2024
2025	if (Current.is(TT: TT_ObjCMethodExpr) && Current.MatchingParen &&
2026	Style.ObjCBreakBeforeNestedBlockParam) {
2027	if (Style.ColumnLimit) {
2028	// If this '[' opens an ObjC call, determine whether all parameters fit
2029	// into one line and put one per line if they don't.
2030	if (getLengthToMatchingParen(Tok: Current, Stack: State.Stack) + State.Column >
2031	getColumnLimit(State)) {
2032	BreakBeforeParameter = true;
2033	}
2034	} else {
2035	// For ColumnLimit = 0, we have to figure out whether there is or has to
2036	// be a line break within this call.
2037	for (const FormatToken *Tok = &Current;
2038	Tok && Tok != Current.MatchingParen; Tok = Tok->Next) {
2039	if (Tok->MustBreakBefore ||
2040	(Tok->CanBreakBefore && Tok->NewlinesBefore > 0)) {
2041	BreakBeforeParameter = true;
2042	break;
2043	}
2044	}
2045	}
2046	}
2047
2048	if (Style.isJavaScript() && EndsInComma)
2049	BreakBeforeParameter = true;
2050	}
2051	// Generally inherit NoLineBreak from the current scope to nested scope.
2052	// However, don't do this for non-empty nested blocks, dict literals and
2053	// array literals as these follow different indentation rules.
2054	bool NoLineBreak =
2055	Current.Children.empty() &&
2056	!Current.isOneOf(K1: TT_DictLiteral, K2: TT_ArrayInitializerLSquare) &&
2057	(CurrentState.NoLineBreak || CurrentState.NoLineBreakInOperand ||
2058	(Current.is(TT: TT_TemplateOpener) &&
2059	CurrentState.ContainsUnwrappedBuilder));
2060	State.Stack.push_back(
2061	Elt: ParenState(&Current, NewIndent, LastSpace, AvoidBinPacking, NoLineBreak));
2062	auto &NewState = State.Stack.back();
2063	NewState.NestedBlockIndent = NestedBlockIndent;
2064	NewState.BreakBeforeParameter = BreakBeforeParameter;
2065	NewState.HasMultipleNestedBlocks = (Current.BlockParameterCount > 1);
2066
2067	if (Style.BraceWrapping.BeforeLambdaBody && Current.Next &&
2068	Current.is(Kind: tok::l_paren)) {
2069	// Search for any parameter that is a lambda.
2070	FormatToken const *next = Current.Next;
2071	while (next) {
2072	if (next->is(TT: TT_LambdaLSquare)) {
2073	NewState.HasMultipleNestedBlocks = true;
2074	break;
2075	}
2076	next = next->Next;
2077	}
2078	}
2079
2080	NewState.IsInsideObjCArrayLiteral = Current.is(TT: TT_ArrayInitializerLSquare) &&
2081	Current.Previous &&
2082	Current.Previous->is(Kind: tok::at);
2083	}
2084
2085	void ContinuationIndenter::moveStatePastScopeCloser(LineState &State) {
2086	const FormatToken &Current = *State.NextToken;
2087	if (!Current.closesScope())
2088	return;
2089
2090	// If we encounter a closing ), ], } or >, we can remove a level from our
2091	// stacks.
2092	if (State.Stack.size() > 1 &&
2093	(Current.isOneOf(K1: tok::r_paren, K2: tok::r_square, Ks: TT_TemplateString) ||
2094	(Current.is(Kind: tok::r_brace) && State.NextToken != State.Line->First) ||
2095	State.NextToken->is(TT: TT_TemplateCloser) ||
2096	State.NextToken->is(TT: TT_TableGenListCloser) ||
2097	(Current.is(Kind: tok::greater) && Current.is(TT: TT_DictLiteral)))) {
2098	State.Stack.pop_back();
2099	}
2100
2101	auto &CurrentState = State.Stack.back();
2102
2103	// Reevaluate whether ObjC message arguments fit into one line.
2104	// If a receiver spans multiple lines, e.g.:
2105	// [[object block:^{
2106	// return 42;
2107	// }] a:42 b:42];
2108	// BreakBeforeParameter is calculated based on an incorrect assumption
2109	// (it is checked whether the whole expression fits into one line without
2110	// considering a line break inside a message receiver).
2111	// We check whether arguments fit after receiver scope closer (into the same
2112	// line).
2113	if (CurrentState.BreakBeforeParameter && Current.MatchingParen &&
2114	Current.MatchingParen->Previous) {
2115	const FormatToken &CurrentScopeOpener = *Current.MatchingParen->Previous;
2116	if (CurrentScopeOpener.is(TT: TT_ObjCMethodExpr) &&
2117	CurrentScopeOpener.MatchingParen) {
2118	int NecessarySpaceInLine =
2119	getLengthToMatchingParen(Tok: CurrentScopeOpener, Stack: State.Stack) +
2120	CurrentScopeOpener.TotalLength - Current.TotalLength - 1;
2121	if (State.Column + Current.ColumnWidth + NecessarySpaceInLine <=
2122	Style.ColumnLimit) {
2123	CurrentState.BreakBeforeParameter = false;
2124	}
2125	}
2126	}
2127
2128	if (Current.is(Kind: tok::r_square)) {
2129	// If this ends the array subscript expr, reset the corresponding value.
2130	const FormatToken *NextNonComment = Current.getNextNonComment();
2131	if (NextNonComment && NextNonComment->isNot(Kind: tok::l_square))
2132	CurrentState.StartOfArraySubscripts = 0;
2133	}
2134	}
2135
2136	void ContinuationIndenter::moveStateToNewBlock(LineState &State, bool NewLine) {
2137	if (Style.LambdaBodyIndentation == FormatStyle::LBI_OuterScope &&
2138	State.NextToken->is(TT: TT_LambdaLBrace) &&
2139	!State.Line->MightBeFunctionDecl) {
2140	const auto Indent = Style.IndentWidth * Style.BraceWrapping.IndentBraces;
2141	State.Stack.back().NestedBlockIndent = State.FirstIndent + Indent;
2142	}
2143	unsigned NestedBlockIndent = State.Stack.back().NestedBlockIndent;
2144	// ObjC block sometimes follow special indentation rules.
2145	unsigned NewIndent =
2146	NestedBlockIndent + (State.NextToken->is(TT: TT_ObjCBlockLBrace)
2147	? Style.ObjCBlockIndentWidth
2148	: Style.IndentWidth);
2149
2150	// Even when wrapping before lambda body, the left brace can still be added to
2151	// the same line. This occurs when checking whether the whole lambda body can
2152	// go on a single line. In this case we have to make sure there are no line
2153	// breaks in the body, otherwise we could just end up with a regular lambda
2154	// body without the brace wrapped.
2155	bool NoLineBreak = Style.BraceWrapping.BeforeLambdaBody && !NewLine &&
2156	State.NextToken->is(TT: TT_LambdaLBrace);
2157
2158	State.Stack.push_back(Elt: ParenState(State.NextToken, NewIndent,
2159	State.Stack.back().LastSpace,
2160	/*AvoidBinPacking=*/true, NoLineBreak));
2161	State.Stack.back().NestedBlockIndent = NestedBlockIndent;
2162	State.Stack.back().BreakBeforeParameter = true;
2163	}
2164
2165	static unsigned getLastLineEndColumn(StringRef Text, unsigned StartColumn,
2166	unsigned TabWidth,
2167	encoding::Encoding Encoding) {
2168	size_t LastNewlinePos = Text.find_last_of(Chars: "\n");
2169	if (LastNewlinePos == StringRef::npos) {
2170	return StartColumn +
2171	encoding::columnWidthWithTabs(Text, StartColumn, TabWidth, Encoding);
2172	} else {
2173	return encoding::columnWidthWithTabs(Text: Text.substr(Start: LastNewlinePos),
2174	/*StartColumn=*/0, TabWidth, Encoding);
2175	}
2176	}
2177
2178	unsigned ContinuationIndenter::reformatRawStringLiteral(
2179	const FormatToken &Current, LineState &State,
2180	const FormatStyle &RawStringStyle, bool DryRun, bool Newline) {
2181	unsigned StartColumn = State.Column - Current.ColumnWidth;
2182	StringRef OldDelimiter = *getRawStringDelimiter(TokenText: Current.TokenText);
2183	StringRef NewDelimiter =
2184	getCanonicalRawStringDelimiter(Style, Language: RawStringStyle.Language);
2185	if (NewDelimiter.empty())
2186	NewDelimiter = OldDelimiter;
2187	// The text of a raw string is between the leading 'R"delimiter(' and the
2188	// trailing 'delimiter)"'.
2189	unsigned OldPrefixSize = 3 + OldDelimiter.size();
2190	unsigned OldSuffixSize = 2 + OldDelimiter.size();
2191	// We create a virtual text environment which expects a null-terminated
2192	// string, so we cannot use StringRef.
2193	std::string RawText = std::string(
2194	Current.TokenText.substr(Start: OldPrefixSize).drop_back(N: OldSuffixSize));
2195	if (NewDelimiter != OldDelimiter) {
2196	// Don't update to the canonical delimiter 'deli' if ')deli"' occurs in the
2197	// raw string.
2198	std::string CanonicalDelimiterSuffix = (")" + NewDelimiter + "\"").str();
2199	if (StringRef(RawText).contains(Other: CanonicalDelimiterSuffix))
2200	NewDelimiter = OldDelimiter;
2201	}
2202
2203	unsigned NewPrefixSize = 3 + NewDelimiter.size();
2204	unsigned NewSuffixSize = 2 + NewDelimiter.size();
2205
2206	// The first start column is the column the raw text starts after formatting.
2207	unsigned FirstStartColumn = StartColumn + NewPrefixSize;
2208
2209	// The next start column is the intended indentation a line break inside
2210	// the raw string at level 0. It is determined by the following rules:
2211	// - if the content starts on newline, it is one level more than the current
2212	// indent, and
2213	// - if the content does not start on a newline, it is the first start
2214	// column.
2215	// These rules have the advantage that the formatted content both does not
2216	// violate the rectangle rule and visually flows within the surrounding
2217	// source.
2218	bool ContentStartsOnNewline = Current.TokenText[OldPrefixSize] == '\n';
2219	// If this token is the last parameter (checked by looking if it's followed by
2220	// `)` and is not on a newline, the base the indent off the line's nested
2221	// block indent. Otherwise, base the indent off the arguments indent, so we
2222	// can achieve:
2223	//
2224	// fffffffffff(1, 2, 3, R"pb(
2225	// key1: 1 #
2226	// key2: 2)pb");
2227	//
2228	// fffffffffff(1, 2, 3,
2229	// R"pb(
2230	// key1: 1 #
2231	// key2: 2
2232	// )pb");
2233	//
2234	// fffffffffff(1, 2, 3,
2235	// R"pb(
2236	// key1: 1 #
2237	// key2: 2
2238	// )pb",
2239	// 5);
2240	unsigned CurrentIndent =
2241	(!Newline && Current.Next && Current.Next->is(Kind: tok::r_paren))
2242	? State.Stack.back().NestedBlockIndent
2243	: State.Stack.back().Indent;
2244	unsigned NextStartColumn = ContentStartsOnNewline
2245	? CurrentIndent + Style.IndentWidth
2246	: FirstStartColumn;
2247
2248	// The last start column is the column the raw string suffix starts if it is
2249	// put on a newline.
2250	// The last start column is the intended indentation of the raw string postfix
2251	// if it is put on a newline. It is determined by the following rules:
2252	// - if the raw string prefix starts on a newline, it is the column where
2253	// that raw string prefix starts, and
2254	// - if the raw string prefix does not start on a newline, it is the current
2255	// indent.
2256	unsigned LastStartColumn =
2257	Current.NewlinesBefore ? FirstStartColumn - NewPrefixSize : CurrentIndent;
2258
2259	std::pair<tooling::Replacements, unsigned> Fixes = internal::reformat(
2260	Style: RawStringStyle, Code: RawText, Ranges: {tooling::Range(0, RawText.size())},
2261	FirstStartColumn, NextStartColumn, LastStartColumn, FileName: "<stdin>",
2262	/*Status=*/nullptr);
2263
2264	auto NewCode = applyAllReplacements(Code: RawText, Replaces: Fixes.first);
2265	if (!NewCode)
2266	return addMultilineToken(Current, State);
2267	if (!DryRun) {
2268	if (NewDelimiter != OldDelimiter) {
2269	// In 'R"delimiter(...', the delimiter starts 2 characters after the start
2270	// of the token.
2271	SourceLocation PrefixDelimiterStart =
2272	Current.Tok.getLocation().getLocWithOffset(Offset: 2);
2273	auto PrefixErr = Whitespaces.addReplacement(Replacement: tooling::Replacement(
2274	SourceMgr, PrefixDelimiterStart, OldDelimiter.size(), NewDelimiter));
2275	if (PrefixErr) {
2276	llvm::errs()
2277	<< "Failed to update the prefix delimiter of a raw string: "
2278	<< llvm::toString(E: std::move(PrefixErr)) << "\n";
2279	}
2280	// In 'R"delimiter(...)delimiter"', the suffix delimiter starts at
2281	// position length - 1 - |delimiter|.
2282	SourceLocation SuffixDelimiterStart =
2283	Current.Tok.getLocation().getLocWithOffset(Offset: Current.TokenText.size() -
2284	1 - OldDelimiter.size());
2285	auto SuffixErr = Whitespaces.addReplacement(Replacement: tooling::Replacement(
2286	SourceMgr, SuffixDelimiterStart, OldDelimiter.size(), NewDelimiter));
2287	if (SuffixErr) {
2288	llvm::errs()
2289	<< "Failed to update the suffix delimiter of a raw string: "
2290	<< llvm::toString(E: std::move(SuffixErr)) << "\n";
2291	}
2292	}
2293	SourceLocation OriginLoc =
2294	Current.Tok.getLocation().getLocWithOffset(Offset: OldPrefixSize);
2295	for (const tooling::Replacement &Fix : Fixes.first) {
2296	auto Err = Whitespaces.addReplacement(Replacement: tooling::Replacement(
2297	SourceMgr, OriginLoc.getLocWithOffset(Offset: Fix.getOffset()),
2298	Fix.getLength(), Fix.getReplacementText()));
2299	if (Err) {
2300	llvm::errs() << "Failed to reformat raw string: "
2301	<< llvm::toString(E: std::move(Err)) << "\n";
2302	}
2303	}
2304	}
2305	unsigned RawLastLineEndColumn = getLastLineEndColumn(
2306	Text: *NewCode, StartColumn: FirstStartColumn, TabWidth: Style.TabWidth, Encoding);
2307	State.Column = RawLastLineEndColumn + NewSuffixSize;
2308	// Since we're updating the column to after the raw string literal here, we
2309	// have to manually add the penalty for the prefix R"delim( over the column
2310	// limit.
2311	unsigned PrefixExcessCharacters =
2312	StartColumn + NewPrefixSize > Style.ColumnLimit
2313	? StartColumn + NewPrefixSize - Style.ColumnLimit
2314	: 0;
2315	bool IsMultiline =
2316	ContentStartsOnNewline || (NewCode->find(c: '\n') != std::string::npos);
2317	if (IsMultiline) {
2318	// Break before further function parameters on all levels.
2319	for (ParenState &Paren : State.Stack)
2320	Paren.BreakBeforeParameter = true;
2321	}
2322	return Fixes.second + PrefixExcessCharacters * Style.PenaltyExcessCharacter;
2323	}
2324
2325	unsigned ContinuationIndenter::addMultilineToken(const FormatToken &Current,
2326	LineState &State) {
2327	// Break before further function parameters on all levels.
2328	for (ParenState &Paren : State.Stack)
2329	Paren.BreakBeforeParameter = true;
2330
2331	unsigned ColumnsUsed = State.Column;
2332	// We can only affect layout of the first and the last line, so the penalty
2333	// for all other lines is constant, and we ignore it.
2334	State.Column = Current.LastLineColumnWidth;
2335
2336	if (ColumnsUsed > getColumnLimit(State))
2337	return Style.PenaltyExcessCharacter * (ColumnsUsed - getColumnLimit(State));
2338	return 0;
2339	}
2340
2341	unsigned ContinuationIndenter::handleEndOfLine(const FormatToken &Current,
2342	LineState &State, bool DryRun,
2343	bool AllowBreak, bool Newline) {
2344	unsigned Penalty = 0;
2345	// Compute the raw string style to use in case this is a raw string literal
2346	// that can be reformatted.
2347	auto RawStringStyle = getRawStringStyle(Current, State);
2348	if (RawStringStyle && !Current.Finalized) {
2349	Penalty = reformatRawStringLiteral(Current, State, RawStringStyle: *RawStringStyle, DryRun,
2350	Newline);
2351	} else if (Current.IsMultiline && Current.isNot(Kind: TT_BlockComment)) {
2352	// Don't break multi-line tokens other than block comments and raw string
2353	// literals. Instead, just update the state.
2354	Penalty = addMultilineToken(Current, State);
2355	} else if (State.Line->Type != LT_ImportStatement) {
2356	// We generally don't break import statements.
2357	LineState OriginalState = State;
2358
2359	// Whether we force the reflowing algorithm to stay strictly within the
2360	// column limit.
2361	bool Strict = false;
2362	// Whether the first non-strict attempt at reflowing did intentionally
2363	// exceed the column limit.
2364	bool Exceeded = false;
2365	std::tie(args&: Penalty, args&: Exceeded) = breakProtrudingToken(
2366	Current, State, AllowBreak, /*DryRun=*/true, Strict);
2367	if (Exceeded) {
2368	// If non-strict reflowing exceeds the column limit, try whether strict
2369	// reflowing leads to an overall lower penalty.
2370	LineState StrictState = OriginalState;
2371	unsigned StrictPenalty =
2372	breakProtrudingToken(Current, State&: StrictState, AllowBreak,
2373	/*DryRun=*/true, /*Strict=*/true)
2374	.first;
2375	Strict = StrictPenalty <= Penalty;
2376	if (Strict) {
2377	Penalty = StrictPenalty;
2378	State = StrictState;
2379	}
2380	}
2381	if (!DryRun) {
2382	// If we're not in dry-run mode, apply the changes with the decision on
2383	// strictness made above.
2384	breakProtrudingToken(Current, State&: OriginalState, AllowBreak, /*DryRun=*/false,
2385	Strict);
2386	}
2387	}
2388	if (State.Column > getColumnLimit(State)) {
2389	unsigned ExcessCharacters = State.Column - getColumnLimit(State);
2390	Penalty += Style.PenaltyExcessCharacter * ExcessCharacters;
2391	}
2392	return Penalty;
2393	}
2394
2395	// Returns the enclosing function name of a token, or the empty string if not
2396	// found.
2397	static StringRef getEnclosingFunctionName(const FormatToken &Current) {
2398	// Look for: 'function(' or 'function<templates>(' before Current.
2399	auto Tok = Current.getPreviousNonComment();
2400	if (!Tok || Tok->isNot(Kind: tok::l_paren))
2401	return "";
2402	Tok = Tok->getPreviousNonComment();
2403	if (!Tok)
2404	return "";
2405	if (Tok->is(TT: TT_TemplateCloser)) {
2406	Tok = Tok->MatchingParen;
2407	if (Tok)
2408	Tok = Tok->getPreviousNonComment();
2409	}
2410	if (!Tok || Tok->isNot(Kind: tok::identifier))
2411	return "";
2412	return Tok->TokenText;
2413	}
2414
2415	std::optional<FormatStyle>
2416	ContinuationIndenter::getRawStringStyle(const FormatToken &Current,
2417	const LineState &State) {
2418	if (!Current.isStringLiteral())
2419	return std::nullopt;
2420	auto Delimiter = getRawStringDelimiter(TokenText: Current.TokenText);
2421	if (!Delimiter)
2422	return std::nullopt;
2423	auto RawStringStyle = RawStringFormats.getDelimiterStyle(Delimiter: *Delimiter);
2424	if (!RawStringStyle && Delimiter->empty()) {
2425	RawStringStyle = RawStringFormats.getEnclosingFunctionStyle(
2426	EnclosingFunction: getEnclosingFunctionName(Current));
2427	}
2428	if (!RawStringStyle)
2429	return std::nullopt;
2430	RawStringStyle->ColumnLimit = getColumnLimit(State);
2431	return RawStringStyle;
2432	}
2433
2434	std::unique_ptr<BreakableToken>
2435	ContinuationIndenter::createBreakableToken(const FormatToken &Current,
2436	LineState &State, bool AllowBreak) {
2437	unsigned StartColumn = State.Column - Current.ColumnWidth;
2438	if (Current.isStringLiteral()) {
2439	// Strings in JSON cannot be broken. Breaking strings in JavaScript is
2440	// disabled for now.
2441	if (Style.isJson() || Style.isJavaScript() || !Style.BreakStringLiterals ||
2442	!AllowBreak) {
2443	return nullptr;
2444	}
2445
2446	// Don't break string literals inside preprocessor directives (except for
2447	// #define directives, as their contents are stored in separate lines and
2448	// are not affected by this check).
2449	// This way we avoid breaking code with line directives and unknown
2450	// preprocessor directives that contain long string literals.
2451	if (State.Line->Type == LT_PreprocessorDirective)
2452	return nullptr;
2453	// Exempts unterminated string literals from line breaking. The user will
2454	// likely want to terminate the string before any line breaking is done.
2455	if (Current.IsUnterminatedLiteral)
2456	return nullptr;
2457	// Don't break string literals inside Objective-C array literals (doing so
2458	// raises the warning -Wobjc-string-concatenation).
2459	if (State.Stack.back().IsInsideObjCArrayLiteral)
2460	return nullptr;
2461
2462	// The "DPI"/"DPI-C" in SystemVerilog direct programming interface
2463	// imports/exports cannot be split, e.g.
2464	// `import "DPI" function foo();`
2465	// FIXME: make this use same infra as C++ import checks
2466	if (Style.isVerilog() && Current.Previous &&
2467	Current.Previous->isOneOf(K1: tok::kw_export, K2: Keywords.kw_import)) {
2468	return nullptr;
2469	}
2470	StringRef Text = Current.TokenText;
2471
2472	// We need this to address the case where there is an unbreakable tail only
2473	// if certain other formatting decisions have been taken. The
2474	// UnbreakableTailLength of Current is an overapproximation in that case and
2475	// we need to be correct here.
2476	unsigned UnbreakableTailLength = (State.NextToken && canBreak(State))
2477	? 0
2478	: Current.UnbreakableTailLength;
2479
2480	if (Style.isVerilog() || Style.isJava() || Style.isJavaScript() ||
2481	Style.isCSharp()) {
2482	BreakableStringLiteralUsingOperators::QuoteStyleType QuoteStyle;
2483	if (Style.isJavaScript() && Text.starts_with(Prefix: "'") &&
2484	Text.ends_with(Suffix: "'")) {
2485	QuoteStyle = BreakableStringLiteralUsingOperators::SingleQuotes;
2486	} else if (Style.isCSharp() && Text.starts_with(Prefix: "@\"") &&
2487	Text.ends_with(Suffix: "\"")) {
2488	QuoteStyle = BreakableStringLiteralUsingOperators::AtDoubleQuotes;
2489	} else if (Text.starts_with(Prefix: "\"") && Text.ends_with(Suffix: "\"")) {
2490	QuoteStyle = BreakableStringLiteralUsingOperators::DoubleQuotes;
2491	} else {
2492	return nullptr;
2493	}
2494	return std::make_unique<BreakableStringLiteralUsingOperators>(
2495	args: Current, args&: QuoteStyle,
2496	/*UnindentPlus=*/args: shouldUnindentNextOperator(Tok: Current), args&: StartColumn,
2497	args&: UnbreakableTailLength, args: State.Line->InPPDirective, args&: Encoding, args&: Style);
2498	}
2499
2500	StringRef Prefix;
2501	StringRef Postfix;
2502	// FIXME: Handle whitespace between '_T', '(', '"..."', and ')'.
2503	// FIXME: Store Prefix and Suffix (or PrefixLength and SuffixLength to
2504	// reduce the overhead) for each FormatToken, which is a string, so that we
2505	// don't run multiple checks here on the hot path.
2506	if ((Text.ends_with(Suffix: Postfix = "\"") &&
2507	(Text.starts_with(Prefix: Prefix = "@\"") || Text.starts_with(Prefix: Prefix = "\"") ||
2508	Text.starts_with(Prefix: Prefix = "u\"") ||
2509	Text.starts_with(Prefix: Prefix = "U\"") ||
2510	Text.starts_with(Prefix: Prefix = "u8\"") ||
2511	Text.starts_with(Prefix: Prefix = "L\""))) ||
2512	(Text.starts_with(Prefix: Prefix = "_T(\"") &&
2513	Text.ends_with(Suffix: Postfix = "\")"))) {
2514	return std::make_unique<BreakableStringLiteral>(
2515	args: Current, args&: StartColumn, args&: Prefix, args&: Postfix, args&: UnbreakableTailLength,
2516	args: State.Line->InPPDirective, args&: Encoding, args&: Style);
2517	}
2518	} else if (Current.is(TT: TT_BlockComment)) {
2519	if (Style.ReflowComments == FormatStyle::RCS_Never ||
2520	// If a comment token switches formatting, like
2521	// /* clang-format on */, we don't want to break it further,
2522	// but we may still want to adjust its indentation.
2523	switchesFormatting(Token: Current)) {
2524	return nullptr;
2525	}
2526	return std::make_unique<BreakableBlockComment>(
2527	args: Current, args&: StartColumn, args: Current.OriginalColumn, args: !Current.Previous,
2528	args: State.Line->InPPDirective, args&: Encoding, args&: Style, args: Whitespaces.useCRLF());
2529	} else if (Current.is(TT: TT_LineComment) &&
2530	(!Current.Previous ||
2531	Current.Previous->isNot(Kind: TT_ImplicitStringLiteral))) {
2532	bool RegularComments = [&]() {
2533	for (const FormatToken *T = &Current; T && T->is(TT: TT_LineComment);
2534	T = T->Next) {
2535	if (!(T->TokenText.starts_with(Prefix: "//") || T->TokenText.starts_with(Prefix: "#")))
2536	return false;
2537	}
2538	return true;
2539	}();
2540	if (Style.ReflowComments == FormatStyle::RCS_Never ||
2541	CommentPragmasRegex.match(String: Current.TokenText.substr(Start: 2)) ||
2542	switchesFormatting(Token: Current) || !RegularComments) {
2543	return nullptr;
2544	}
2545	return std::make_unique<BreakableLineCommentSection>(
2546	args: Current, args&: StartColumn, /*InPPDirective=*/args: false, args&: Encoding, args&: Style);
2547	}
2548	return nullptr;
2549	}
2550
2551	std::pair<unsigned, bool>
2552	ContinuationIndenter::breakProtrudingToken(const FormatToken &Current,
2553	LineState &State, bool AllowBreak,
2554	bool DryRun, bool Strict) {
2555	std::unique_ptr<const BreakableToken> Token =
2556	createBreakableToken(Current, State, AllowBreak);
2557	if (!Token)
2558	return {0, false};
2559	assert(Token->getLineCount() > 0);
2560	unsigned ColumnLimit = getColumnLimit(State);
2561	if (Current.is(TT: TT_LineComment)) {
2562	// We don't insert backslashes when breaking line comments.
2563	ColumnLimit = Style.ColumnLimit;
2564	}
2565	if (ColumnLimit == 0) {
2566	// To make the rest of the function easier set the column limit to the
2567	// maximum, if there should be no limit.
2568	ColumnLimit = std::numeric_limits<decltype(ColumnLimit)>::max();
2569	}
2570	if (Current.UnbreakableTailLength >= ColumnLimit)
2571	return {0, false};
2572	// ColumnWidth was already accounted into State.Column before calling
2573	// breakProtrudingToken.
2574	unsigned StartColumn = State.Column - Current.ColumnWidth;
2575	unsigned NewBreakPenalty = Current.isStringLiteral()
2576	? Style.PenaltyBreakString
2577	: Style.PenaltyBreakComment;
2578	// Stores whether we intentionally decide to let a line exceed the column
2579	// limit.
2580	bool Exceeded = false;
2581	// Stores whether we introduce a break anywhere in the token.
2582	bool BreakInserted = Token->introducesBreakBeforeToken();
2583	// Store whether we inserted a new line break at the end of the previous
2584	// logical line.
2585	bool NewBreakBefore = false;
2586	// We use a conservative reflowing strategy. Reflow starts after a line is
2587	// broken or the corresponding whitespace compressed. Reflow ends as soon as a
2588	// line that doesn't get reflown with the previous line is reached.
2589	bool Reflow = false;
2590	// Keep track of where we are in the token:
2591	// Where we are in the content of the current logical line.
2592	unsigned TailOffset = 0;
2593	// The column number we're currently at.
2594	unsigned ContentStartColumn =
2595	Token->getContentStartColumn(LineIndex: 0, /*Break=*/false);
2596	// The number of columns left in the current logical line after TailOffset.
2597	unsigned RemainingTokenColumns =
2598	Token->getRemainingLength(LineIndex: 0, Offset: TailOffset, StartColumn: ContentStartColumn);
2599	// Adapt the start of the token, for example indent.
2600	if (!DryRun)
2601	Token->adaptStartOfLine(LineIndex: 0, Whitespaces);
2602
2603	unsigned ContentIndent = 0;
2604	unsigned Penalty = 0;
2605	LLVM_DEBUG(llvm::dbgs() << "Breaking protruding token at column "
2606	<< StartColumn << ".\n");
2607	for (unsigned LineIndex = 0, EndIndex = Token->getLineCount();
2608	LineIndex != EndIndex; ++LineIndex) {
2609	LLVM_DEBUG(llvm::dbgs()
2610	<< " Line: " << LineIndex << " (Reflow: " << Reflow << ")\n");
2611	NewBreakBefore = false;
2612	// If we did reflow the previous line, we'll try reflowing again. Otherwise
2613	// we'll start reflowing if the current line is broken or whitespace is
2614	// compressed.
2615	bool TryReflow = Reflow;
2616	// Break the current token until we can fit the rest of the line.
2617	while (ContentStartColumn + RemainingTokenColumns > ColumnLimit) {
2618	LLVM_DEBUG(llvm::dbgs() << " Over limit, need: "
2619	<< (ContentStartColumn + RemainingTokenColumns)
2620	<< ", space: " << ColumnLimit
2621	<< ", reflown prefix: " << ContentStartColumn
2622	<< ", offset in line: " << TailOffset << "\n");
2623	// If the current token doesn't fit, find the latest possible split in the
2624	// current line so that breaking at it will be under the column limit.
2625	// FIXME: Use the earliest possible split while reflowing to correctly
2626	// compress whitespace within a line.
2627	BreakableToken::Split Split =
2628	Token->getSplit(LineIndex, TailOffset, ColumnLimit,
2629	ContentStartColumn, CommentPragmasRegex);
2630	if (Split.first == StringRef::npos) {
2631	// No break opportunity - update the penalty and continue with the next
2632	// logical line.
2633	if (LineIndex < EndIndex - 1) {
2634	// The last line's penalty is handled in addNextStateToQueue() or when
2635	// calling replaceWhitespaceAfterLastLine below.
2636	Penalty += Style.PenaltyExcessCharacter *
2637	(ContentStartColumn + RemainingTokenColumns - ColumnLimit);
2638	}
2639	LLVM_DEBUG(llvm::dbgs() << " No break opportunity.\n");
2640	break;
2641	}
2642	assert(Split.first != 0);
2643
2644	if (Token->supportsReflow()) {
2645	// Check whether the next natural split point after the current one can
2646	// still fit the line, either because we can compress away whitespace,
2647	// or because the penalty the excess characters introduce is lower than
2648	// the break penalty.
2649	// We only do this for tokens that support reflowing, and thus allow us
2650	// to change the whitespace arbitrarily (e.g. comments).
2651	// Other tokens, like string literals, can be broken on arbitrary
2652	// positions.
2653
2654	// First, compute the columns from TailOffset to the next possible split
2655	// position.
2656	// For example:
2657	// ColumnLimit: |
2658	// // Some text that breaks
2659	// ^ tail offset
2660	// ^-- split
2661	// ^-------- to split columns
2662	// ^--- next split
2663	// ^--------------- to next split columns
2664	unsigned ToSplitColumns = Token->getRangeLength(
2665	LineIndex, Offset: TailOffset, Length: Split.first, StartColumn: ContentStartColumn);
2666	LLVM_DEBUG(llvm::dbgs() << " ToSplit: " << ToSplitColumns << "\n");
2667
2668	BreakableToken::Split NextSplit = Token->getSplit(
2669	LineIndex, TailOffset: TailOffset + Split.first + Split.second, ColumnLimit,
2670	ContentStartColumn: ContentStartColumn + ToSplitColumns + 1, CommentPragmasRegex);
2671	// Compute the columns necessary to fit the next non-breakable sequence
2672	// into the current line.
2673	unsigned ToNextSplitColumns = 0;
2674	if (NextSplit.first == StringRef::npos) {
2675	ToNextSplitColumns = Token->getRemainingLength(LineIndex, Offset: TailOffset,
2676	StartColumn: ContentStartColumn);
2677	} else {
2678	ToNextSplitColumns = Token->getRangeLength(
2679	LineIndex, Offset: TailOffset,
2680	Length: Split.first + Split.second + NextSplit.first, StartColumn: ContentStartColumn);
2681	}
2682	// Compress the whitespace between the break and the start of the next
2683	// unbreakable sequence.
2684	ToNextSplitColumns =
2685	Token->getLengthAfterCompression(RemainingTokenColumns: ToNextSplitColumns, Split);
2686	LLVM_DEBUG(llvm::dbgs()
2687	<< " ContentStartColumn: " << ContentStartColumn << "\n");
2688	LLVM_DEBUG(llvm::dbgs()
2689	<< " ToNextSplit: " << ToNextSplitColumns << "\n");
2690	// If the whitespace compression makes us fit, continue on the current
2691	// line.
2692	bool ContinueOnLine =
2693	ContentStartColumn + ToNextSplitColumns <= ColumnLimit;
2694	unsigned ExcessCharactersPenalty = 0;
2695	if (!ContinueOnLine && !Strict) {
2696	// Similarly, if the excess characters' penalty is lower than the
2697	// penalty of introducing a new break, continue on the current line.
2698	ExcessCharactersPenalty =
2699	(ContentStartColumn + ToNextSplitColumns - ColumnLimit) *
2700	Style.PenaltyExcessCharacter;
2701	LLVM_DEBUG(llvm::dbgs()
2702	<< " Penalty excess: " << ExcessCharactersPenalty
2703	<< "\n break : " << NewBreakPenalty << "\n");
2704	if (ExcessCharactersPenalty < NewBreakPenalty) {
2705	Exceeded = true;
2706	ContinueOnLine = true;
2707	}
2708	}
2709	if (ContinueOnLine) {
2710	LLVM_DEBUG(llvm::dbgs() << " Continuing on line...\n");
2711	// The current line fits after compressing the whitespace - reflow
2712	// the next line into it if possible.
2713	TryReflow = true;
2714	if (!DryRun) {
2715	Token->compressWhitespace(LineIndex, TailOffset, Split,
2716	Whitespaces);
2717	}
2718	// When we continue on the same line, leave one space between content.
2719	ContentStartColumn += ToSplitColumns + 1;
2720	Penalty += ExcessCharactersPenalty;
2721	TailOffset += Split.first + Split.second;
2722	RemainingTokenColumns = Token->getRemainingLength(
2723	LineIndex, Offset: TailOffset, StartColumn: ContentStartColumn);
2724	continue;
2725	}
2726	}
2727	LLVM_DEBUG(llvm::dbgs() << " Breaking...\n");
2728	// Update the ContentIndent only if the current line was not reflown with
2729	// the previous line, since in that case the previous line should still
2730	// determine the ContentIndent. Also never intent the last line.
2731	if (!Reflow)
2732	ContentIndent = Token->getContentIndent(LineIndex);
2733	LLVM_DEBUG(llvm::dbgs()
2734	<< " ContentIndent: " << ContentIndent << "\n");
2735	ContentStartColumn = ContentIndent + Token->getContentStartColumn(
2736	LineIndex, /*Break=*/true);
2737
2738	unsigned NewRemainingTokenColumns = Token->getRemainingLength(
2739	LineIndex, Offset: TailOffset + Split.first + Split.second,
2740	StartColumn: ContentStartColumn);
2741	if (NewRemainingTokenColumns == 0) {
2742	// No content to indent.
2743	ContentIndent = 0;
2744	ContentStartColumn =
2745	Token->getContentStartColumn(LineIndex, /*Break=*/true);
2746	NewRemainingTokenColumns = Token->getRemainingLength(
2747	LineIndex, Offset: TailOffset + Split.first + Split.second,
2748	StartColumn: ContentStartColumn);
2749	}
2750
2751	// When breaking before a tab character, it may be moved by a few columns,
2752	// but will still be expanded to the next tab stop, so we don't save any
2753	// columns.
2754	if (NewRemainingTokenColumns >= RemainingTokenColumns) {
2755	// FIXME: Do we need to adjust the penalty?
2756	break;
2757	}
2758
2759	LLVM_DEBUG(llvm::dbgs() << " Breaking at: " << TailOffset + Split.first
2760	<< ", " << Split.second << "\n");
2761	if (!DryRun) {
2762	Token->insertBreak(LineIndex, TailOffset, Split, ContentIndent,
2763	Whitespaces);
2764	}
2765
2766	Penalty += NewBreakPenalty;
2767	TailOffset += Split.first + Split.second;
2768	RemainingTokenColumns = NewRemainingTokenColumns;
2769	BreakInserted = true;
2770	NewBreakBefore = true;
2771	}
2772	// In case there's another line, prepare the state for the start of the next
2773	// line.
2774	if (LineIndex + 1 != EndIndex) {
2775	unsigned NextLineIndex = LineIndex + 1;
2776	if (NewBreakBefore) {
2777	// After breaking a line, try to reflow the next line into the current
2778	// one once RemainingTokenColumns fits.
2779	TryReflow = true;
2780	}
2781	if (TryReflow) {
2782	// We decided that we want to try reflowing the next line into the
2783	// current one.
2784	// We will now adjust the state as if the reflow is successful (in
2785	// preparation for the next line), and see whether that works. If we
2786	// decide that we cannot reflow, we will later reset the state to the
2787	// start of the next line.
2788	Reflow = false;
2789	// As we did not continue breaking the line, RemainingTokenColumns is
2790	// known to fit after ContentStartColumn. Adapt ContentStartColumn to
2791	// the position at which we want to format the next line if we do
2792	// actually reflow.
2793	// When we reflow, we need to add a space between the end of the current
2794	// line and the next line's start column.
2795	ContentStartColumn += RemainingTokenColumns + 1;
2796	// Get the split that we need to reflow next logical line into the end
2797	// of the current one; the split will include any leading whitespace of
2798	// the next logical line.
2799	BreakableToken::Split SplitBeforeNext =
2800	Token->getReflowSplit(LineIndex: NextLineIndex, CommentPragmasRegex);
2801	LLVM_DEBUG(llvm::dbgs()
2802	<< " Size of reflown text: " << ContentStartColumn
2803	<< "\n Potential reflow split: ");
2804	if (SplitBeforeNext.first != StringRef::npos) {
2805	LLVM_DEBUG(llvm::dbgs() << SplitBeforeNext.first << ", "
2806	<< SplitBeforeNext.second << "\n");
2807	TailOffset = SplitBeforeNext.first + SplitBeforeNext.second;
2808	// If the rest of the next line fits into the current line below the
2809	// column limit, we can safely reflow.
2810	RemainingTokenColumns = Token->getRemainingLength(
2811	LineIndex: NextLineIndex, Offset: TailOffset, StartColumn: ContentStartColumn);
2812	Reflow = true;
2813	if (ContentStartColumn + RemainingTokenColumns > ColumnLimit) {
2814	LLVM_DEBUG(llvm::dbgs()
2815	<< " Over limit after reflow, need: "
2816	<< (ContentStartColumn + RemainingTokenColumns)
2817	<< ", space: " << ColumnLimit
2818	<< ", reflown prefix: " << ContentStartColumn
2819	<< ", offset in line: " << TailOffset << "\n");
2820	// If the whole next line does not fit, try to find a point in
2821	// the next line at which we can break so that attaching the part
2822	// of the next line to that break point onto the current line is
2823	// below the column limit.
2824	BreakableToken::Split Split =
2825	Token->getSplit(LineIndex: NextLineIndex, TailOffset, ColumnLimit,
2826	ContentStartColumn, CommentPragmasRegex);
2827	if (Split.first == StringRef::npos) {
2828	LLVM_DEBUG(llvm::dbgs() << " Did not find later break\n");
2829	Reflow = false;
2830	} else {
2831	// Check whether the first split point gets us below the column
2832	// limit. Note that we will execute this split below as part of
2833	// the normal token breaking and reflow logic within the line.
2834	unsigned ToSplitColumns = Token->getRangeLength(
2835	LineIndex: NextLineIndex, Offset: TailOffset, Length: Split.first, StartColumn: ContentStartColumn);
2836	if (ContentStartColumn + ToSplitColumns > ColumnLimit) {
2837	LLVM_DEBUG(llvm::dbgs() << " Next split protrudes, need: "
2838	<< (ContentStartColumn + ToSplitColumns)
2839	<< ", space: " << ColumnLimit);
2840	unsigned ExcessCharactersPenalty =
2841	(ContentStartColumn + ToSplitColumns - ColumnLimit) *
2842	Style.PenaltyExcessCharacter;
2843	if (NewBreakPenalty < ExcessCharactersPenalty)
2844	Reflow = false;
2845	}
2846	}
2847	}
2848	} else {
2849	LLVM_DEBUG(llvm::dbgs() << "not found.\n");
2850	}
2851	}
2852	if (!Reflow) {
2853	// If we didn't reflow into the next line, the only space to consider is
2854	// the next logical line. Reset our state to match the start of the next
2855	// line.
2856	TailOffset = 0;
2857	ContentStartColumn =
2858	Token->getContentStartColumn(LineIndex: NextLineIndex, /*Break=*/false);
2859	RemainingTokenColumns = Token->getRemainingLength(
2860	LineIndex: NextLineIndex, Offset: TailOffset, StartColumn: ContentStartColumn);
2861	// Adapt the start of the token, for example indent.
2862	if (!DryRun)
2863	Token->adaptStartOfLine(LineIndex: NextLineIndex, Whitespaces);
2864	} else {
2865	// If we found a reflow split and have added a new break before the next
2866	// line, we are going to remove the line break at the start of the next
2867	// logical line. For example, here we'll add a new line break after
2868	// 'text', and subsequently delete the line break between 'that' and
2869	// 'reflows'.
2870	// // some text that
2871	// // reflows
2872	// ->
2873	// // some text
2874	// // that reflows
2875	// When adding the line break, we also added the penalty for it, so we
2876	// need to subtract that penalty again when we remove the line break due
2877	// to reflowing.
2878	if (NewBreakBefore) {
2879	assert(Penalty >= NewBreakPenalty);
2880	Penalty -= NewBreakPenalty;
2881	}
2882	if (!DryRun)
2883	Token->reflow(LineIndex: NextLineIndex, Whitespaces);
2884	}
2885	}
2886	}
2887
2888	BreakableToken::Split SplitAfterLastLine =
2889	Token->getSplitAfterLastLine(TailOffset);
2890	if (SplitAfterLastLine.first != StringRef::npos) {
2891	LLVM_DEBUG(llvm::dbgs() << "Replacing whitespace after last line.\n");
2892
2893	// We add the last line's penalty here, since that line is going to be split
2894	// now.
2895	Penalty += Style.PenaltyExcessCharacter *
2896	(ContentStartColumn + RemainingTokenColumns - ColumnLimit);
2897
2898	if (!DryRun) {
2899	Token->replaceWhitespaceAfterLastLine(TailOffset, SplitAfterLastLine,
2900	Whitespaces);
2901	}
2902	ContentStartColumn =
2903	Token->getContentStartColumn(LineIndex: Token->getLineCount() - 1, /*Break=*/true);
2904	RemainingTokenColumns = Token->getRemainingLength(
2905	LineIndex: Token->getLineCount() - 1,
2906	Offset: TailOffset + SplitAfterLastLine.first + SplitAfterLastLine.second,
2907	StartColumn: ContentStartColumn);
2908	}
2909
2910	State.Column = ContentStartColumn + RemainingTokenColumns -
2911	Current.UnbreakableTailLength;
2912
2913	if (BreakInserted) {
2914	if (!DryRun)
2915	Token->updateAfterBroken(Whitespaces);
2916
2917	// If we break the token inside a parameter list, we need to break before
2918	// the next parameter on all levels, so that the next parameter is clearly
2919	// visible. Line comments already introduce a break.
2920	if (Current.isNot(Kind: TT_LineComment))
2921	for (ParenState &Paren : State.Stack)
2922	Paren.BreakBeforeParameter = true;
2923
2924	if (Current.is(TT: TT_BlockComment))
2925	State.NoContinuation = true;
2926
2927	State.Stack.back().LastSpace = StartColumn;
2928	}
2929
2930	Token->updateNextToken(State);
2931
2932	return {Penalty, Exceeded};
2933	}
2934
2935	unsigned ContinuationIndenter::getColumnLimit(const LineState &State) const {
2936	// In preprocessor directives reserve two chars for trailing " \".
2937	return Style.ColumnLimit - (State.Line->InPPDirective ? 2 : 0);
2938	}
2939
2940	bool ContinuationIndenter::nextIsMultilineString(const LineState &State) {
2941	const FormatToken &Current = *State.NextToken;
2942	if (!Current.isStringLiteral() || Current.is(TT: TT_ImplicitStringLiteral))
2943	return false;
2944	// We never consider raw string literals "multiline" for the purpose of
2945	// AlwaysBreakBeforeMultilineStrings implementation as they are special-cased
2946	// (see TokenAnnotator::mustBreakBefore().
2947	if (Current.TokenText.starts_with(Prefix: "R\""))
2948	return false;
2949	if (Current.IsMultiline)
2950	return true;
2951	if (Current.getNextNonComment() &&
2952	Current.getNextNonComment()->isStringLiteral()) {
2953	return true; // Implicit concatenation.
2954	}
2955	if (Style.ColumnLimit != 0 && Style.BreakStringLiterals &&
2956	State.Column + Current.ColumnWidth + Current.UnbreakableTailLength >
2957	Style.ColumnLimit) {
2958	return true; // String will be split.
2959	}
2960	return false;
2961	}
2962
2963	} // namespace format
2964	} // namespace clang
2965