1 //===--- TokenAnnotator.cpp - Format C++ code -----------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief This file implements a token annotator, i.e. creates
12 /// \c AnnotatedTokens out of \c FormatTokens with required extra information.
14 //===----------------------------------------------------------------------===//
16 #include "TokenAnnotator.h"
17 #include "clang/Basic/SourceManager.h"
18 #include "llvm/ADT/SmallPtrSet.h"
19 #include "llvm/Support/Debug.h"
21 #define DEBUG_TYPE "format-token-annotator"
28 /// \brief A parser that gathers additional information about tokens.
30 /// The \c TokenAnnotator tries to match parenthesis and square brakets and
31 /// store a parenthesis levels. It also tries to resolve matching "<" and ">"
32 /// into template parameter lists.
33 class AnnotatingParser {
35 AnnotatingParser(const FormatStyle &Style, AnnotatedLine &Line,
36 const AdditionalKeywords &Keywords)
37 : Style(Style), Line(Line), CurrentToken(Line.First), AutoFound(false),
39 Contexts.push_back(Context(tok::unknown, 1, /*IsExpression=*/false));
40 resetTokenMetadata(CurrentToken);
45 if (!CurrentToken || !CurrentToken->Previous)
47 if (NonTemplateLess.count(CurrentToken->Previous))
50 const FormatToken& Previous = *CurrentToken->Previous;
51 if (Previous.Previous) {
52 if (Previous.Previous->Tok.isLiteral())
54 if (Previous.Previous->is(tok::r_paren) && Contexts.size() > 1 &&
55 (!Previous.Previous->MatchingParen ||
56 !Previous.Previous->MatchingParen->is(TT_OverloadedOperatorLParen)))
60 FormatToken *Left = CurrentToken->Previous;
61 Left->ParentBracket = Contexts.back().ContextKind;
62 ScopedContextCreator ContextCreator(*this, tok::less, 12);
64 // If this angle is in the context of an expression, we need to be more
65 // hesitant to detect it as opening template parameters.
66 bool InExprContext = Contexts.back().IsExpression;
68 Contexts.back().IsExpression = false;
69 // If there's a template keyword before the opening angle bracket, this is a
70 // template parameter, not an argument.
71 Contexts.back().InTemplateArgument =
72 Left->Previous && Left->Previous->Tok.isNot(tok::kw_template);
74 if (Style.Language == FormatStyle::LK_Java &&
75 CurrentToken->is(tok::question))
78 while (CurrentToken) {
79 if (CurrentToken->is(tok::greater)) {
80 Left->MatchingParen = CurrentToken;
81 CurrentToken->MatchingParen = Left;
82 CurrentToken->Type = TT_TemplateCloser;
86 if (CurrentToken->is(tok::question) &&
87 Style.Language == FormatStyle::LK_Java) {
91 if (CurrentToken->isOneOf(tok::r_paren, tok::r_square, tok::r_brace) ||
92 (CurrentToken->isOneOf(tok::colon, tok::question) && InExprContext))
94 // If a && or || is found and interpreted as a binary operator, this set
95 // of angles is likely part of something like "a < b && c > d". If the
96 // angles are inside an expression, the ||/&& might also be a binary
97 // operator that was misinterpreted because we are parsing template
99 // FIXME: This is getting out of hand, write a decent parser.
100 if (CurrentToken->Previous->isOneOf(tok::pipepipe, tok::ampamp) &&
101 CurrentToken->Previous->is(TT_BinaryOperator) &&
102 Contexts[Contexts.size() - 2].IsExpression &&
103 !Line.startsWith(tok::kw_template))
105 updateParameterCount(Left, CurrentToken);
112 bool parseParens(bool LookForDecls = false) {
115 FormatToken *Left = CurrentToken->Previous;
116 Left->ParentBracket = Contexts.back().ContextKind;
117 ScopedContextCreator ContextCreator(*this, tok::l_paren, 1);
119 // FIXME: This is a bit of a hack. Do better.
120 Contexts.back().ColonIsForRangeExpr =
121 Contexts.size() == 2 && Contexts[0].ColonIsForRangeExpr;
123 bool StartsObjCMethodExpr = false;
124 if (CurrentToken->is(tok::caret)) {
125 // (^ can start a block type.
126 Left->Type = TT_ObjCBlockLParen;
127 } else if (FormatToken *MaybeSel = Left->Previous) {
128 // @selector( starts a selector.
129 if (MaybeSel->isObjCAtKeyword(tok::objc_selector) && MaybeSel->Previous &&
130 MaybeSel->Previous->is(tok::at)) {
131 StartsObjCMethodExpr = true;
135 if (Left->is(TT_OverloadedOperatorLParen)) {
136 Contexts.back().IsExpression = false;
137 } else if (Left->Previous &&
138 (Left->Previous->isOneOf(tok::kw_static_assert, tok::kw_decltype,
139 tok::kw_if, tok::kw_while, tok::l_paren,
141 Left->Previous->is(TT_BinaryOperator))) {
142 // static_assert, if and while usually contain expressions.
143 Contexts.back().IsExpression = true;
144 } else if (Style.Language == FormatStyle::LK_JavaScript && Left->Previous &&
145 (Left->Previous->is(Keywords.kw_function) ||
146 (Left->Previous->endsSequence(tok::identifier,
147 Keywords.kw_function)))) {
148 // function(...) or function f(...)
149 Contexts.back().IsExpression = false;
150 } else if (Left->Previous && Left->Previous->is(tok::r_square) &&
151 Left->Previous->MatchingParen &&
152 Left->Previous->MatchingParen->is(TT_LambdaLSquare)) {
153 // This is a parameter list of a lambda expression.
154 Contexts.back().IsExpression = false;
155 } else if (Line.InPPDirective &&
156 (!Left->Previous || !Left->Previous->is(tok::identifier))) {
157 Contexts.back().IsExpression = true;
158 } else if (Contexts[Contexts.size() - 2].CaretFound) {
159 // This is the parameter list of an ObjC block.
160 Contexts.back().IsExpression = false;
161 } else if (Left->Previous && Left->Previous->is(tok::kw___attribute)) {
162 Left->Type = TT_AttributeParen;
163 } else if (Left->Previous && Left->Previous->is(TT_ForEachMacro)) {
164 // The first argument to a foreach macro is a declaration.
165 Contexts.back().IsForEachMacro = true;
166 Contexts.back().IsExpression = false;
167 } else if (Left->Previous && Left->Previous->MatchingParen &&
168 Left->Previous->MatchingParen->is(TT_ObjCBlockLParen)) {
169 Contexts.back().IsExpression = false;
170 } else if (!Line.MustBeDeclaration && !Line.InPPDirective) {
172 Left->Previous && Left->Previous->isOneOf(tok::kw_for, tok::kw_catch);
173 Contexts.back().IsExpression = !IsForOrCatch;
176 if (StartsObjCMethodExpr) {
177 Contexts.back().ColonIsObjCMethodExpr = true;
178 Left->Type = TT_ObjCMethodExpr;
181 bool MightBeFunctionType = !Contexts[Contexts.size() - 2].IsExpression;
182 bool ProbablyFunctionType = CurrentToken->isOneOf(tok::star, tok::amp);
183 bool HasMultipleLines = false;
184 bool HasMultipleParametersOnALine = false;
185 bool MightBeObjCForRangeLoop =
186 Left->Previous && Left->Previous->is(tok::kw_for);
187 while (CurrentToken) {
188 // LookForDecls is set when "if (" has been seen. Check for
189 // 'identifier' '*' 'identifier' followed by not '=' -- this
190 // '*' has to be a binary operator but determineStarAmpUsage() will
191 // categorize it as an unary operator, so set the right type here.
192 if (LookForDecls && CurrentToken->Next) {
193 FormatToken *Prev = CurrentToken->getPreviousNonComment();
195 FormatToken *PrevPrev = Prev->getPreviousNonComment();
196 FormatToken *Next = CurrentToken->Next;
197 if (PrevPrev && PrevPrev->is(tok::identifier) &&
198 Prev->isOneOf(tok::star, tok::amp, tok::ampamp) &&
199 CurrentToken->is(tok::identifier) && Next->isNot(tok::equal)) {
200 Prev->Type = TT_BinaryOperator;
201 LookForDecls = false;
206 if (CurrentToken->Previous->is(TT_PointerOrReference) &&
207 CurrentToken->Previous->Previous->isOneOf(tok::l_paren,
209 ProbablyFunctionType = true;
210 if (CurrentToken->is(tok::comma))
211 MightBeFunctionType = false;
212 if (CurrentToken->Previous->is(TT_BinaryOperator))
213 Contexts.back().IsExpression = true;
214 if (CurrentToken->is(tok::r_paren)) {
215 if (MightBeFunctionType && ProbablyFunctionType && CurrentToken->Next &&
216 (CurrentToken->Next->is(tok::l_paren) ||
217 (CurrentToken->Next->is(tok::l_square) && Line.MustBeDeclaration)))
218 Left->Type = TT_FunctionTypeLParen;
219 Left->MatchingParen = CurrentToken;
220 CurrentToken->MatchingParen = Left;
222 if (CurrentToken->Next && CurrentToken->Next->is(tok::l_brace) &&
223 Left->Previous && Left->Previous->is(tok::l_paren)) {
224 // Detect the case where macros are used to generate lambdas or
225 // function bodies, e.g.:
226 // auto my_lambda = MARCO((Type *type, int i) { .. body .. });
227 for (FormatToken *Tok = Left; Tok != CurrentToken; Tok = Tok->Next) {
228 if (Tok->is(TT_BinaryOperator) &&
229 Tok->isOneOf(tok::star, tok::amp, tok::ampamp))
230 Tok->Type = TT_PointerOrReference;
234 if (StartsObjCMethodExpr) {
235 CurrentToken->Type = TT_ObjCMethodExpr;
236 if (Contexts.back().FirstObjCSelectorName) {
237 Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
238 Contexts.back().LongestObjCSelectorName;
242 if (Left->is(TT_AttributeParen))
243 CurrentToken->Type = TT_AttributeParen;
244 if (Left->Previous && Left->Previous->is(TT_JavaAnnotation))
245 CurrentToken->Type = TT_JavaAnnotation;
246 if (Left->Previous && Left->Previous->is(TT_LeadingJavaAnnotation))
247 CurrentToken->Type = TT_LeadingJavaAnnotation;
249 if (!HasMultipleLines)
250 Left->PackingKind = PPK_Inconclusive;
251 else if (HasMultipleParametersOnALine)
252 Left->PackingKind = PPK_BinPacked;
254 Left->PackingKind = PPK_OnePerLine;
259 if (CurrentToken->isOneOf(tok::r_square, tok::r_brace))
262 if (CurrentToken->is(tok::l_brace))
263 Left->Type = TT_Unknown; // Not TT_ObjCBlockLParen
264 if (CurrentToken->is(tok::comma) && CurrentToken->Next &&
265 !CurrentToken->Next->HasUnescapedNewline &&
266 !CurrentToken->Next->isTrailingComment())
267 HasMultipleParametersOnALine = true;
268 if (CurrentToken->isOneOf(tok::kw_const, tok::kw_auto) ||
269 CurrentToken->isSimpleTypeSpecifier())
270 Contexts.back().IsExpression = false;
271 if (CurrentToken->isOneOf(tok::semi, tok::colon))
272 MightBeObjCForRangeLoop = false;
273 if (MightBeObjCForRangeLoop && CurrentToken->is(Keywords.kw_in))
274 CurrentToken->Type = TT_ObjCForIn;
275 // When we discover a 'new', we set CanBeExpression to 'false' in order to
276 // parse the type correctly. Reset that after a comma.
277 if (CurrentToken->is(tok::comma))
278 Contexts.back().CanBeExpression = true;
280 FormatToken *Tok = CurrentToken;
283 updateParameterCount(Left, Tok);
284 if (CurrentToken && CurrentToken->HasUnescapedNewline)
285 HasMultipleLines = true;
294 // A '[' could be an index subscript (after an identifier or after
295 // ')' or ']'), it could be the start of an Objective-C method
296 // expression, or it could the start of an Objective-C array literal.
297 FormatToken *Left = CurrentToken->Previous;
298 Left->ParentBracket = Contexts.back().ContextKind;
299 FormatToken *Parent = Left->getPreviousNonComment();
300 bool StartsObjCMethodExpr =
301 Style.Language == FormatStyle::LK_Cpp &&
302 Contexts.back().CanBeExpression && Left->isNot(TT_LambdaLSquare) &&
303 CurrentToken->isNot(tok::l_brace) &&
305 Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
306 tok::kw_return, tok::kw_throw) ||
307 Parent->isUnaryOperator() ||
308 Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
309 getBinOpPrecedence(Parent->Tok.getKind(), true, true) > prec::Unknown);
310 bool ColonFound = false;
312 unsigned BindingIncrease = 1;
313 if (Left->is(TT_Unknown)) {
314 if (StartsObjCMethodExpr) {
315 Left->Type = TT_ObjCMethodExpr;
316 } else if (Style.Language == FormatStyle::LK_JavaScript && Parent &&
317 Contexts.back().ContextKind == tok::l_brace &&
318 Parent->isOneOf(tok::l_brace, tok::comma)) {
319 Left->Type = TT_JsComputedPropertyName;
320 } else if (Style.Language == FormatStyle::LK_Proto ||
322 Parent->isOneOf(TT_BinaryOperator, TT_TemplateCloser, tok::at,
323 tok::comma, tok::l_paren, tok::l_square,
324 tok::question, tok::colon, tok::kw_return,
325 // Should only be relevant to JavaScript:
327 Left->Type = TT_ArrayInitializerLSquare;
329 BindingIncrease = 10;
330 Left->Type = TT_ArraySubscriptLSquare;
334 ScopedContextCreator ContextCreator(*this, tok::l_square, BindingIncrease);
335 Contexts.back().IsExpression = true;
336 Contexts.back().ColonIsObjCMethodExpr = StartsObjCMethodExpr;
338 while (CurrentToken) {
339 if (CurrentToken->is(tok::r_square)) {
340 if (CurrentToken->Next && CurrentToken->Next->is(tok::l_paren) &&
341 Left->is(TT_ObjCMethodExpr)) {
342 // An ObjC method call is rarely followed by an open parenthesis.
343 // FIXME: Do we incorrectly label ":" with this?
344 StartsObjCMethodExpr = false;
345 Left->Type = TT_Unknown;
347 if (StartsObjCMethodExpr && CurrentToken->Previous != Left) {
348 CurrentToken->Type = TT_ObjCMethodExpr;
349 // determineStarAmpUsage() thinks that '*' '[' is allocating an
350 // array of pointers, but if '[' starts a selector then '*' is a
352 if (Parent && Parent->is(TT_PointerOrReference))
353 Parent->Type = TT_BinaryOperator;
355 Left->MatchingParen = CurrentToken;
356 CurrentToken->MatchingParen = Left;
357 if (Contexts.back().FirstObjCSelectorName) {
358 Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
359 Contexts.back().LongestObjCSelectorName;
360 if (Left->BlockParameterCount > 1)
361 Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName = 0;
366 if (CurrentToken->isOneOf(tok::r_paren, tok::r_brace))
368 if (CurrentToken->is(tok::colon)) {
369 if (Left->is(TT_ArraySubscriptLSquare)) {
370 Left->Type = TT_ObjCMethodExpr;
371 StartsObjCMethodExpr = true;
372 Contexts.back().ColonIsObjCMethodExpr = true;
373 if (Parent && Parent->is(tok::r_paren))
374 Parent->Type = TT_CastRParen;
378 if (CurrentToken->is(tok::comma) && Left->is(TT_ObjCMethodExpr) &&
380 Left->Type = TT_ArrayInitializerLSquare;
381 FormatToken *Tok = CurrentToken;
384 updateParameterCount(Left, Tok);
391 FormatToken *Left = CurrentToken->Previous;
392 Left->ParentBracket = Contexts.back().ContextKind;
394 if (Contexts.back().CaretFound)
395 Left->Type = TT_ObjCBlockLBrace;
396 Contexts.back().CaretFound = false;
398 ScopedContextCreator ContextCreator(*this, tok::l_brace, 1);
399 Contexts.back().ColonIsDictLiteral = true;
400 if (Left->BlockKind == BK_BracedInit)
401 Contexts.back().IsExpression = true;
403 while (CurrentToken) {
404 if (CurrentToken->is(tok::r_brace)) {
405 Left->MatchingParen = CurrentToken;
406 CurrentToken->MatchingParen = Left;
410 if (CurrentToken->isOneOf(tok::r_paren, tok::r_square))
412 updateParameterCount(Left, CurrentToken);
413 if (CurrentToken->isOneOf(tok::colon, tok::l_brace)) {
414 FormatToken *Previous = CurrentToken->getPreviousNonComment();
415 if (((CurrentToken->is(tok::colon) &&
416 (!Contexts.back().ColonIsDictLiteral ||
417 Style.Language != FormatStyle::LK_Cpp)) ||
418 Style.Language == FormatStyle::LK_Proto) &&
419 (Previous->Tok.getIdentifierInfo() ||
420 Previous->is(tok::string_literal)))
421 Previous->Type = TT_SelectorName;
422 if (CurrentToken->is(tok::colon) ||
423 Style.Language == FormatStyle::LK_JavaScript)
424 Left->Type = TT_DictLiteral;
433 void updateParameterCount(FormatToken *Left, FormatToken *Current) {
434 if (Current->is(tok::l_brace) && Current->BlockKind == BK_Block)
435 ++Left->BlockParameterCount;
436 if (Current->is(tok::comma)) {
437 ++Left->ParameterCount;
439 Left->Role.reset(new CommaSeparatedList(Style));
440 Left->Role->CommaFound(Current);
441 } else if (Left->ParameterCount == 0 && Current->isNot(tok::comment)) {
442 Left->ParameterCount = 1;
446 bool parseConditional() {
447 while (CurrentToken) {
448 if (CurrentToken->is(tok::colon)) {
449 CurrentToken->Type = TT_ConditionalExpr;
459 bool parseTemplateDeclaration() {
460 if (CurrentToken && CurrentToken->is(tok::less)) {
461 CurrentToken->Type = TT_TemplateOpener;
466 CurrentToken->Previous->ClosesTemplateDeclaration = true;
472 bool consumeToken() {
473 FormatToken *Tok = CurrentToken;
475 switch (Tok->Tok.getKind()) {
478 if (!Tok->Previous && Line.MustBeDeclaration)
479 Tok->Type = TT_ObjCMethodSpecifier;
484 // Colons from ?: are handled in parseConditional().
485 if (Style.Language == FormatStyle::LK_JavaScript) {
486 if (Contexts.back().ColonIsForRangeExpr || // colon in for loop
487 (Contexts.size() == 1 && // switch/case labels
488 !Line.First->isOneOf(tok::kw_enum, tok::kw_case)) ||
489 Contexts.back().ContextKind == tok::l_paren || // function params
490 Contexts.back().ContextKind == tok::l_square || // array type
491 (Contexts.size() == 1 &&
492 Line.MustBeDeclaration)) { // method/property declaration
493 Tok->Type = TT_JsTypeColon;
497 if (Contexts.back().ColonIsDictLiteral ||
498 Style.Language == FormatStyle::LK_Proto) {
499 Tok->Type = TT_DictLiteral;
500 } else if (Contexts.back().ColonIsObjCMethodExpr ||
501 Line.startsWith(TT_ObjCMethodSpecifier)) {
502 Tok->Type = TT_ObjCMethodExpr;
503 Tok->Previous->Type = TT_SelectorName;
504 if (Tok->Previous->ColumnWidth >
505 Contexts.back().LongestObjCSelectorName)
506 Contexts.back().LongestObjCSelectorName = Tok->Previous->ColumnWidth;
507 if (!Contexts.back().FirstObjCSelectorName)
508 Contexts.back().FirstObjCSelectorName = Tok->Previous;
509 } else if (Contexts.back().ColonIsForRangeExpr) {
510 Tok->Type = TT_RangeBasedForLoopColon;
511 } else if (CurrentToken && CurrentToken->is(tok::numeric_constant)) {
512 Tok->Type = TT_BitFieldColon;
513 } else if (Contexts.size() == 1 &&
514 !Line.First->isOneOf(tok::kw_enum, tok::kw_case)) {
515 if (Tok->Previous->isOneOf(tok::r_paren, tok::kw_noexcept))
516 Tok->Type = TT_CtorInitializerColon;
518 Tok->Type = TT_InheritanceColon;
519 } else if (Tok->Previous->is(tok::identifier) && Tok->Next &&
520 Tok->Next->isOneOf(tok::r_paren, tok::comma)) {
521 // This handles a special macro in ObjC code where selectors including
522 // the colon are passed as macro arguments.
523 Tok->Type = TT_ObjCMethodExpr;
524 } else if (Contexts.back().ContextKind == tok::l_paren) {
525 Tok->Type = TT_InlineASMColon;
530 // | and & in declarations/type expressions represent union and
531 // intersection types, respectively.
532 if (Style.Language == FormatStyle::LK_JavaScript &&
533 !Contexts.back().IsExpression)
534 Tok->Type = TT_JsTypeOperator;
538 if (CurrentToken && CurrentToken->is(tok::l_paren)) {
540 if (!parseParens(/*LookForDecls=*/true))
545 if (Style.Language == FormatStyle::LK_JavaScript && Tok->Previous &&
546 Tok->Previous->is(tok::period))
548 Contexts.back().ColonIsForRangeExpr = true;
554 // When faced with 'operator()()', the kw_operator handler incorrectly
555 // marks the first l_paren as a OverloadedOperatorLParen. Here, we make
556 // the first two parens OverloadedOperators and the second l_paren an
557 // OverloadedOperatorLParen.
559 Tok->Previous->is(tok::r_paren) &&
560 Tok->Previous->MatchingParen &&
561 Tok->Previous->MatchingParen->is(TT_OverloadedOperatorLParen)) {
562 Tok->Previous->Type = TT_OverloadedOperator;
563 Tok->Previous->MatchingParen->Type = TT_OverloadedOperator;
564 Tok->Type = TT_OverloadedOperatorLParen;
569 if (Line.MustBeDeclaration && Contexts.size() == 1 &&
570 !Contexts.back().IsExpression && !Line.startsWith(TT_ObjCProperty) &&
572 !Tok->Previous->isOneOf(tok::kw_decltype, tok::kw___attribute,
573 TT_LeadingJavaAnnotation)))
574 Line.MightBeFunctionDecl = true;
586 Tok->Type = TT_TemplateOpener;
588 Tok->Type = TT_BinaryOperator;
589 NonTemplateLess.insert(Tok);
598 // Lines can start with '}'.
603 Tok->Type = TT_BinaryOperator;
605 case tok::kw_operator:
606 while (CurrentToken &&
607 !CurrentToken->isOneOf(tok::l_paren, tok::semi, tok::r_paren)) {
608 if (CurrentToken->isOneOf(tok::star, tok::amp))
609 CurrentToken->Type = TT_PointerOrReference;
612 CurrentToken->Previous->isOneOf(TT_BinaryOperator, tok::comma))
613 CurrentToken->Previous->Type = TT_OverloadedOperator;
616 CurrentToken->Type = TT_OverloadedOperatorLParen;
617 if (CurrentToken->Previous->is(TT_BinaryOperator))
618 CurrentToken->Previous->Type = TT_OverloadedOperator;
622 if (Style.Language == FormatStyle::LK_JavaScript && Tok->Next &&
623 Tok->Next->isOneOf(tok::semi, tok::comma, tok::colon, tok::r_paren,
625 // Question marks before semicolons, colons, etc. indicate optional
626 // types (fields, parameters), e.g.
627 // function(x?: string, y?) {...}
629 Tok->Type = TT_JsTypeOptionalQuestion;
632 // Declarations cannot be conditional expressions, this can only be part
633 // of a type declaration.
634 if (Line.MustBeDeclaration &&
635 Style.Language == FormatStyle::LK_JavaScript)
639 case tok::kw_template:
640 parseTemplateDeclaration();
643 if (Contexts.back().InCtorInitializer)
644 Tok->Type = TT_CtorInitializerComma;
645 else if (Contexts.back().FirstStartOfName &&
646 (Contexts.size() == 1 || Line.startsWith(tok::kw_for))) {
647 Contexts.back().FirstStartOfName->PartOfMultiVariableDeclStmt = true;
648 Line.IsMultiVariableDeclStmt = true;
650 if (Contexts.back().IsForEachMacro)
651 Contexts.back().IsExpression = true;
659 void parseIncludeDirective() {
660 if (CurrentToken && CurrentToken->is(tok::less)) {
662 while (CurrentToken) {
663 if (CurrentToken->isNot(tok::comment) || CurrentToken->Next)
664 CurrentToken->Type = TT_ImplicitStringLiteral;
670 void parseWarningOrError() {
672 // We still want to format the whitespace left of the first token of the
675 while (CurrentToken) {
676 CurrentToken->Type = TT_ImplicitStringLiteral;
682 next(); // Consume "pragma".
684 CurrentToken->isOneOf(Keywords.kw_mark, Keywords.kw_option)) {
685 bool IsMark = CurrentToken->is(Keywords.kw_mark);
686 next(); // Consume "mark".
687 next(); // Consume first token (so we fix leading whitespace).
688 while (CurrentToken) {
689 if (IsMark || CurrentToken->Previous->is(TT_BinaryOperator))
690 CurrentToken->Type = TT_ImplicitStringLiteral;
696 LineType parsePreprocessorDirective() {
697 bool IsFirstToken = CurrentToken->IsFirst;
698 LineType Type = LT_PreprocessorDirective;
703 if (Style.Language == FormatStyle::LK_JavaScript && IsFirstToken) {
704 // JavaScript files can contain shebang lines of the form:
705 // #!/usr/bin/env node
706 // Treat these like C++ #include directives.
707 while (CurrentToken) {
708 // Tokens cannot be comments here.
709 CurrentToken->Type = TT_ImplicitStringLiteral;
712 return LT_ImportStatement;
715 if (CurrentToken->Tok.is(tok::numeric_constant)) {
716 CurrentToken->SpacesRequiredBefore = 1;
719 // Hashes in the middle of a line can lead to any strange token
721 if (!CurrentToken->Tok.getIdentifierInfo())
723 switch (CurrentToken->Tok.getIdentifierInfo()->getPPKeywordID()) {
724 case tok::pp_include:
725 case tok::pp_include_next:
728 parseIncludeDirective();
729 Type = LT_ImportStatement;
732 case tok::pp_warning:
733 parseWarningOrError();
740 Contexts.back().IsExpression = true;
752 LineType parseLine() {
753 NonTemplateLess.clear();
754 if (CurrentToken->is(tok::hash))
755 return parsePreprocessorDirective();
757 // Directly allow to 'import <string-literal>' to support protocol buffer
758 // definitions (code.google.com/p/protobuf) or missing "#" (either way we
759 // should not break the line).
760 IdentifierInfo *Info = CurrentToken->Tok.getIdentifierInfo();
761 if ((Style.Language == FormatStyle::LK_Java &&
762 CurrentToken->is(Keywords.kw_package)) ||
763 (Info && Info->getPPKeywordID() == tok::pp_import &&
764 CurrentToken->Next &&
765 CurrentToken->Next->isOneOf(tok::string_literal, tok::identifier,
768 parseIncludeDirective();
769 return LT_ImportStatement;
772 // If this line starts and ends in '<' and '>', respectively, it is likely
773 // part of "#define <a/b.h>".
774 if (CurrentToken->is(tok::less) && Line.Last->is(tok::greater)) {
775 parseIncludeDirective();
776 return LT_ImportStatement;
779 // In .proto files, top-level options are very similar to import statements
780 // and should not be line-wrapped.
781 if (Style.Language == FormatStyle::LK_Proto && Line.Level == 0 &&
782 CurrentToken->is(Keywords.kw_option)) {
784 if (CurrentToken && CurrentToken->is(tok::identifier))
785 return LT_ImportStatement;
788 bool KeywordVirtualFound = false;
789 bool ImportStatement = false;
791 // import {...} from '...';
792 if (Style.Language == FormatStyle::LK_JavaScript &&
793 CurrentToken->is(Keywords.kw_import))
794 ImportStatement = true;
796 while (CurrentToken) {
797 if (CurrentToken->is(tok::kw_virtual))
798 KeywordVirtualFound = true;
799 if (Style.Language == FormatStyle::LK_JavaScript) {
800 // export {...} from '...';
801 // An export followed by "from 'some string';" is a re-export from
802 // another module identified by a URI and is treated as a
803 // LT_ImportStatement (i.e. prevent wraps on it for long URIs).
804 // Just "export {...};" or "export class ..." should not be treated as
805 // an import in this sense.
806 if (Line.First->is(tok::kw_export) &&
807 CurrentToken->is(Keywords.kw_from) && CurrentToken->Next &&
808 CurrentToken->Next->isStringLiteral())
809 ImportStatement = true;
810 if (isClosureImportStatement(*CurrentToken))
811 ImportStatement = true;
816 if (KeywordVirtualFound)
817 return LT_VirtualFunctionDecl;
819 return LT_ImportStatement;
821 if (Line.startsWith(TT_ObjCMethodSpecifier)) {
822 if (Contexts.back().FirstObjCSelectorName)
823 Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
824 Contexts.back().LongestObjCSelectorName;
825 return LT_ObjCMethodDecl;
832 bool isClosureImportStatement(const FormatToken &Tok) {
833 // FIXME: Closure-library specific stuff should not be hard-coded but be
835 return Tok.TokenText == "goog" && Tok.Next && Tok.Next->is(tok::period) &&
836 Tok.Next->Next && (Tok.Next->Next->TokenText == "module" ||
837 Tok.Next->Next->TokenText == "provide" ||
838 Tok.Next->Next->TokenText == "require" ||
839 Tok.Next->Next->TokenText == "setTestOnly" ||
840 Tok.Next->Next->TokenText == "forwardDeclare") &&
841 Tok.Next->Next->Next && Tok.Next->Next->Next->is(tok::l_paren);
844 void resetTokenMetadata(FormatToken *Token) {
848 // Reset token type in case we have already looked at it and then
849 // recovered from an error (e.g. failure to find the matching >).
850 if (!CurrentToken->isOneOf(TT_LambdaLSquare, TT_ForEachMacro,
851 TT_FunctionLBrace, TT_ImplicitStringLiteral,
852 TT_InlineASMBrace, TT_JsFatArrow, TT_LambdaArrow,
854 CurrentToken->Type = TT_Unknown;
855 CurrentToken->Role.reset();
856 CurrentToken->MatchingParen = nullptr;
857 CurrentToken->FakeLParens.clear();
858 CurrentToken->FakeRParens = 0;
863 CurrentToken->NestingLevel = Contexts.size() - 1;
864 CurrentToken->BindingStrength = Contexts.back().BindingStrength;
865 modifyContext(*CurrentToken);
866 determineTokenType(*CurrentToken);
867 CurrentToken = CurrentToken->Next;
870 resetTokenMetadata(CurrentToken);
873 /// \brief A struct to hold information valid in a specific context, e.g.
874 /// a pair of parenthesis.
876 Context(tok::TokenKind ContextKind, unsigned BindingStrength,
878 : ContextKind(ContextKind), BindingStrength(BindingStrength),
879 IsExpression(IsExpression) {}
881 tok::TokenKind ContextKind;
882 unsigned BindingStrength;
884 unsigned LongestObjCSelectorName = 0;
885 bool ColonIsForRangeExpr = false;
886 bool ColonIsDictLiteral = false;
887 bool ColonIsObjCMethodExpr = false;
888 FormatToken *FirstObjCSelectorName = nullptr;
889 FormatToken *FirstStartOfName = nullptr;
890 bool CanBeExpression = true;
891 bool InTemplateArgument = false;
892 bool InCtorInitializer = false;
893 bool CaretFound = false;
894 bool IsForEachMacro = false;
897 /// \brief Puts a new \c Context onto the stack \c Contexts for the lifetime
898 /// of each instance.
899 struct ScopedContextCreator {
902 ScopedContextCreator(AnnotatingParser &P, tok::TokenKind ContextKind,
905 P.Contexts.push_back(Context(ContextKind,
906 P.Contexts.back().BindingStrength + Increase,
907 P.Contexts.back().IsExpression));
910 ~ScopedContextCreator() { P.Contexts.pop_back(); }
913 void modifyContext(const FormatToken &Current) {
914 if (Current.getPrecedence() == prec::Assignment &&
915 !Line.First->isOneOf(tok::kw_template, tok::kw_using, tok::kw_return) &&
916 (!Current.Previous || Current.Previous->isNot(tok::kw_operator))) {
917 Contexts.back().IsExpression = true;
918 if (!Line.startsWith(TT_UnaryOperator)) {
919 for (FormatToken *Previous = Current.Previous;
920 Previous && Previous->Previous &&
921 !Previous->Previous->isOneOf(tok::comma, tok::semi);
922 Previous = Previous->Previous) {
923 if (Previous->isOneOf(tok::r_square, tok::r_paren)) {
924 Previous = Previous->MatchingParen;
928 if (Previous->opensScope())
930 if (Previous->isOneOf(TT_BinaryOperator, TT_UnaryOperator) &&
931 Previous->isOneOf(tok::star, tok::amp, tok::ampamp) &&
932 Previous->Previous && Previous->Previous->isNot(tok::equal))
933 Previous->Type = TT_PointerOrReference;
936 } else if (Current.is(tok::lessless) &&
937 (!Current.Previous || !Current.Previous->is(tok::kw_operator))) {
938 Contexts.back().IsExpression = true;
939 } else if (Current.isOneOf(tok::kw_return, tok::kw_throw)) {
940 Contexts.back().IsExpression = true;
941 } else if (Current.is(TT_TrailingReturnArrow)) {
942 Contexts.back().IsExpression = false;
943 } else if (Current.is(TT_LambdaArrow) || Current.is(Keywords.kw_assert)) {
944 Contexts.back().IsExpression = Style.Language == FormatStyle::LK_Java;
945 } else if (Current.Previous &&
946 Current.Previous->is(TT_CtorInitializerColon)) {
947 Contexts.back().IsExpression = true;
948 Contexts.back().InCtorInitializer = true;
949 } else if (Current.isOneOf(tok::r_paren, tok::greater, tok::comma)) {
950 for (FormatToken *Previous = Current.Previous;
951 Previous && Previous->isOneOf(tok::star, tok::amp);
952 Previous = Previous->Previous)
953 Previous->Type = TT_PointerOrReference;
954 if (Line.MustBeDeclaration && !Contexts.front().InCtorInitializer)
955 Contexts.back().IsExpression = false;
956 } else if (Current.is(tok::kw_new)) {
957 Contexts.back().CanBeExpression = false;
958 } else if (Current.isOneOf(tok::semi, tok::exclaim)) {
959 // This should be the condition or increment in a for-loop.
960 Contexts.back().IsExpression = true;
964 void determineTokenType(FormatToken &Current) {
965 if (!Current.is(TT_Unknown))
966 // The token type is already known.
969 // Line.MightBeFunctionDecl can only be true after the parentheses of a
970 // function declaration have been found. In this case, 'Current' is a
971 // trailing token of this declaration and thus cannot be a name.
972 if (Current.is(Keywords.kw_instanceof)) {
973 Current.Type = TT_BinaryOperator;
974 } else if (isStartOfName(Current) &&
975 (!Line.MightBeFunctionDecl || Current.NestingLevel != 0)) {
976 Contexts.back().FirstStartOfName = &Current;
977 Current.Type = TT_StartOfName;
978 } else if (Current.isOneOf(tok::kw_auto, tok::kw___auto_type)) {
980 } else if (Current.is(tok::arrow) &&
981 Style.Language == FormatStyle::LK_Java) {
982 Current.Type = TT_LambdaArrow;
983 } else if (Current.is(tok::arrow) && AutoFound && Line.MustBeDeclaration &&
984 Current.NestingLevel == 0) {
985 Current.Type = TT_TrailingReturnArrow;
986 } else if (Current.isOneOf(tok::star, tok::amp, tok::ampamp)) {
988 determineStarAmpUsage(Current, Contexts.back().CanBeExpression &&
989 Contexts.back().IsExpression,
990 Contexts.back().InTemplateArgument);
991 } else if (Current.isOneOf(tok::minus, tok::plus, tok::caret)) {
992 Current.Type = determinePlusMinusCaretUsage(Current);
993 if (Current.is(TT_UnaryOperator) && Current.is(tok::caret))
994 Contexts.back().CaretFound = true;
995 } else if (Current.isOneOf(tok::minusminus, tok::plusplus)) {
996 Current.Type = determineIncrementUsage(Current);
997 } else if (Current.isOneOf(tok::exclaim, tok::tilde)) {
998 Current.Type = TT_UnaryOperator;
999 } else if (Current.is(tok::question)) {
1000 if (Style.Language == FormatStyle::LK_JavaScript &&
1001 Line.MustBeDeclaration) {
1002 // In JavaScript, `interface X { foo?(): bar; }` is an optional method
1003 // on the interface, not a ternary expression.
1004 Current.Type = TT_JsTypeOptionalQuestion;
1006 Current.Type = TT_ConditionalExpr;
1008 } else if (Current.isBinaryOperator() &&
1009 (!Current.Previous || Current.Previous->isNot(tok::l_square))) {
1010 Current.Type = TT_BinaryOperator;
1011 } else if (Current.is(tok::comment)) {
1012 if (Current.TokenText.startswith("/*")) {
1013 if (Current.TokenText.endswith("*/"))
1014 Current.Type = TT_BlockComment;
1016 // The lexer has for some reason determined a comment here. But we
1017 // cannot really handle it, if it isn't properly terminated.
1018 Current.Tok.setKind(tok::unknown);
1020 Current.Type = TT_LineComment;
1022 } else if (Current.is(tok::r_paren)) {
1023 if (rParenEndsCast(Current))
1024 Current.Type = TT_CastRParen;
1025 if (Current.MatchingParen && Current.Next &&
1026 !Current.Next->isBinaryOperator() &&
1027 !Current.Next->isOneOf(tok::semi, tok::colon, tok::l_brace,
1028 tok::period, tok::arrow, tok::coloncolon))
1029 if (FormatToken *BeforeParen = Current.MatchingParen->Previous)
1030 if (BeforeParen->is(tok::identifier) &&
1031 BeforeParen->TokenText == BeforeParen->TokenText.upper() &&
1032 (!BeforeParen->Previous ||
1033 BeforeParen->Previous->ClosesTemplateDeclaration))
1034 Current.Type = TT_FunctionAnnotationRParen;
1035 } else if (Current.is(tok::at) && Current.Next) {
1036 if (Current.Next->isStringLiteral()) {
1037 Current.Type = TT_ObjCStringLiteral;
1039 switch (Current.Next->Tok.getObjCKeywordID()) {
1040 case tok::objc_interface:
1041 case tok::objc_implementation:
1042 case tok::objc_protocol:
1043 Current.Type = TT_ObjCDecl;
1045 case tok::objc_property:
1046 Current.Type = TT_ObjCProperty;
1052 } else if (Current.is(tok::period)) {
1053 FormatToken *PreviousNoComment = Current.getPreviousNonComment();
1054 if (PreviousNoComment &&
1055 PreviousNoComment->isOneOf(tok::comma, tok::l_brace))
1056 Current.Type = TT_DesignatedInitializerPeriod;
1057 else if (Style.Language == FormatStyle::LK_Java && Current.Previous &&
1058 Current.Previous->isOneOf(TT_JavaAnnotation,
1059 TT_LeadingJavaAnnotation)) {
1060 Current.Type = Current.Previous->Type;
1062 } else if (Current.isOneOf(tok::identifier, tok::kw_const) &&
1064 !Current.Previous->isOneOf(tok::equal, tok::at) &&
1065 Line.MightBeFunctionDecl && Contexts.size() == 1) {
1066 // Line.MightBeFunctionDecl can only be true after the parentheses of a
1067 // function declaration have been found.
1068 Current.Type = TT_TrailingAnnotation;
1069 } else if ((Style.Language == FormatStyle::LK_Java ||
1070 Style.Language == FormatStyle::LK_JavaScript) &&
1072 if (Current.Previous->is(tok::at) &&
1073 Current.isNot(Keywords.kw_interface)) {
1074 const FormatToken &AtToken = *Current.Previous;
1075 const FormatToken *Previous = AtToken.getPreviousNonComment();
1076 if (!Previous || Previous->is(TT_LeadingJavaAnnotation))
1077 Current.Type = TT_LeadingJavaAnnotation;
1079 Current.Type = TT_JavaAnnotation;
1080 } else if (Current.Previous->is(tok::period) &&
1081 Current.Previous->isOneOf(TT_JavaAnnotation,
1082 TT_LeadingJavaAnnotation)) {
1083 Current.Type = Current.Previous->Type;
1088 /// \brief Take a guess at whether \p Tok starts a name of a function or
1089 /// variable declaration.
1091 /// This is a heuristic based on whether \p Tok is an identifier following
1092 /// something that is likely a type.
1093 bool isStartOfName(const FormatToken &Tok) {
1094 if (Tok.isNot(tok::identifier) || !Tok.Previous)
1097 if (Tok.Previous->isOneOf(TT_LeadingJavaAnnotation, Keywords.kw_instanceof))
1099 if (Style.Language == FormatStyle::LK_JavaScript &&
1100 Tok.Previous->is(Keywords.kw_in))
1103 // Skip "const" as it does not have an influence on whether this is a name.
1104 FormatToken *PreviousNotConst = Tok.Previous;
1105 while (PreviousNotConst && PreviousNotConst->is(tok::kw_const))
1106 PreviousNotConst = PreviousNotConst->Previous;
1108 if (!PreviousNotConst)
1111 bool IsPPKeyword = PreviousNotConst->is(tok::identifier) &&
1112 PreviousNotConst->Previous &&
1113 PreviousNotConst->Previous->is(tok::hash);
1115 if (PreviousNotConst->is(TT_TemplateCloser))
1116 return PreviousNotConst && PreviousNotConst->MatchingParen &&
1117 PreviousNotConst->MatchingParen->Previous &&
1118 PreviousNotConst->MatchingParen->Previous->isNot(tok::period) &&
1119 PreviousNotConst->MatchingParen->Previous->isNot(tok::kw_template);
1121 if (PreviousNotConst->is(tok::r_paren) && PreviousNotConst->MatchingParen &&
1122 PreviousNotConst->MatchingParen->Previous &&
1123 PreviousNotConst->MatchingParen->Previous->is(tok::kw_decltype))
1126 return (!IsPPKeyword &&
1127 PreviousNotConst->isOneOf(tok::identifier, tok::kw_auto)) ||
1128 PreviousNotConst->is(TT_PointerOrReference) ||
1129 PreviousNotConst->isSimpleTypeSpecifier();
1132 /// \brief Determine whether ')' is ending a cast.
1133 bool rParenEndsCast(const FormatToken &Tok) {
1134 // C-style casts are only used in C++ and Java.
1135 if (Style.Language != FormatStyle::LK_Cpp &&
1136 Style.Language != FormatStyle::LK_Java)
1139 // Empty parens aren't casts and there are no casts at the end of the line.
1140 if (Tok.Previous == Tok.MatchingParen || !Tok.Next || !Tok.MatchingParen)
1143 FormatToken *LeftOfParens = Tok.MatchingParen->getPreviousNonComment();
1145 // If there is a closing parenthesis left of the current parentheses,
1146 // look past it as these might be chained casts.
1147 if (LeftOfParens->is(tok::r_paren)) {
1148 if (!LeftOfParens->MatchingParen ||
1149 !LeftOfParens->MatchingParen->Previous)
1151 LeftOfParens = LeftOfParens->MatchingParen->Previous;
1154 // If there is an identifier (or with a few exceptions a keyword) right
1155 // before the parentheses, this is unlikely to be a cast.
1156 if (LeftOfParens->Tok.getIdentifierInfo() &&
1157 !LeftOfParens->isOneOf(Keywords.kw_in, tok::kw_return, tok::kw_case,
1161 // Certain other tokens right before the parentheses are also signals that
1162 // this cannot be a cast.
1163 if (LeftOfParens->isOneOf(tok::at, tok::r_square, TT_OverloadedOperator,
1164 TT_TemplateCloser, tok::ellipsis))
1168 if (Tok.Next->is(tok::question))
1171 // As Java has no function types, a "(" after the ")" likely means that this
1173 if (Style.Language == FormatStyle::LK_Java && Tok.Next->is(tok::l_paren))
1176 // If a (non-string) literal follows, this is likely a cast.
1177 if (Tok.Next->isNot(tok::string_literal) &&
1178 (Tok.Next->Tok.isLiteral() ||
1179 Tok.Next->isOneOf(tok::kw_sizeof, tok::kw_alignof)))
1182 // Heuristically try to determine whether the parentheses contain a type.
1183 bool ParensAreType =
1185 Tok.Previous->isOneOf(TT_PointerOrReference, TT_TemplateCloser) ||
1186 Tok.Previous->isSimpleTypeSpecifier();
1187 bool ParensCouldEndDecl =
1188 Tok.Next->isOneOf(tok::equal, tok::semi, tok::l_brace, tok::greater);
1189 if (ParensAreType && !ParensCouldEndDecl)
1192 // At this point, we heuristically assume that there are no casts at the
1193 // start of the line. We assume that we have found most cases where there
1194 // are by the logic above, e.g. "(void)x;".
1198 // If the following token is an identifier or 'this', this is a cast. All
1199 // cases where this can be something else are handled above.
1200 if (Tok.Next->isOneOf(tok::identifier, tok::kw_this))
1203 if (!Tok.Next->Next)
1206 // If the next token after the parenthesis is a unary operator, assume
1207 // that this is cast, unless there are unexpected tokens inside the
1210 Tok.Next->isUnaryOperator() || Tok.Next->isOneOf(tok::amp, tok::star);
1211 if (!NextIsUnary || Tok.Next->is(tok::plus) ||
1212 !Tok.Next->Next->isOneOf(tok::identifier, tok::numeric_constant))
1214 // Search for unexpected tokens.
1215 for (FormatToken *Prev = Tok.Previous; Prev != Tok.MatchingParen;
1216 Prev = Prev->Previous) {
1217 if (!Prev->isOneOf(tok::kw_const, tok::identifier, tok::coloncolon))
1223 /// \brief Return the type of the given token assuming it is * or &.
1224 TokenType determineStarAmpUsage(const FormatToken &Tok, bool IsExpression,
1225 bool InTemplateArgument) {
1226 if (Style.Language == FormatStyle::LK_JavaScript)
1227 return TT_BinaryOperator;
1229 const FormatToken *PrevToken = Tok.getPreviousNonComment();
1231 return TT_UnaryOperator;
1233 const FormatToken *NextToken = Tok.getNextNonComment();
1235 NextToken->isOneOf(tok::arrow, Keywords.kw_final,
1236 Keywords.kw_override) ||
1237 (NextToken->is(tok::l_brace) && !NextToken->getNextNonComment()))
1238 return TT_PointerOrReference;
1240 if (PrevToken->is(tok::coloncolon))
1241 return TT_PointerOrReference;
1243 if (PrevToken->isOneOf(tok::l_paren, tok::l_square, tok::l_brace,
1244 tok::comma, tok::semi, tok::kw_return, tok::colon,
1245 tok::equal, tok::kw_delete, tok::kw_sizeof) ||
1246 PrevToken->isOneOf(TT_BinaryOperator, TT_ConditionalExpr,
1247 TT_UnaryOperator, TT_CastRParen))
1248 return TT_UnaryOperator;
1250 if (NextToken->is(tok::l_square) && NextToken->isNot(TT_LambdaLSquare))
1251 return TT_PointerOrReference;
1252 if (NextToken->is(tok::kw_operator) && !IsExpression)
1253 return TT_PointerOrReference;
1254 if (NextToken->isOneOf(tok::comma, tok::semi))
1255 return TT_PointerOrReference;
1257 if (PrevToken->is(tok::r_paren) && PrevToken->MatchingParen &&
1258 PrevToken->MatchingParen->Previous &&
1259 PrevToken->MatchingParen->Previous->isOneOf(tok::kw_typeof,
1261 return TT_PointerOrReference;
1263 if (PrevToken->Tok.isLiteral() ||
1264 PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::kw_true,
1265 tok::kw_false, tok::r_brace) ||
1266 NextToken->Tok.isLiteral() ||
1267 NextToken->isOneOf(tok::kw_true, tok::kw_false) ||
1268 NextToken->isUnaryOperator() ||
1269 // If we know we're in a template argument, there are no named
1270 // declarations. Thus, having an identifier on the right-hand side
1271 // indicates a binary operator.
1272 (InTemplateArgument && NextToken->Tok.isAnyIdentifier()))
1273 return TT_BinaryOperator;
1275 // "&&(" is quite unlikely to be two successive unary "&".
1276 if (Tok.is(tok::ampamp) && NextToken && NextToken->is(tok::l_paren))
1277 return TT_BinaryOperator;
1279 // This catches some cases where evaluation order is used as control flow:
1281 const FormatToken *NextNextToken = NextToken->getNextNonComment();
1282 if (NextNextToken && NextNextToken->is(tok::arrow))
1283 return TT_BinaryOperator;
1285 // It is very unlikely that we are going to find a pointer or reference type
1286 // definition on the RHS of an assignment.
1287 if (IsExpression && !Contexts.back().CaretFound)
1288 return TT_BinaryOperator;
1290 return TT_PointerOrReference;
1293 TokenType determinePlusMinusCaretUsage(const FormatToken &Tok) {
1294 const FormatToken *PrevToken = Tok.getPreviousNonComment();
1295 if (!PrevToken || PrevToken->is(TT_CastRParen))
1296 return TT_UnaryOperator;
1298 // Use heuristics to recognize unary operators.
1299 if (PrevToken->isOneOf(tok::equal, tok::l_paren, tok::comma, tok::l_square,
1300 tok::question, tok::colon, tok::kw_return,
1301 tok::kw_case, tok::at, tok::l_brace))
1302 return TT_UnaryOperator;
1304 // There can't be two consecutive binary operators.
1305 if (PrevToken->is(TT_BinaryOperator))
1306 return TT_UnaryOperator;
1308 // Fall back to marking the token as binary operator.
1309 return TT_BinaryOperator;
1312 /// \brief Determine whether ++/-- are pre- or post-increments/-decrements.
1313 TokenType determineIncrementUsage(const FormatToken &Tok) {
1314 const FormatToken *PrevToken = Tok.getPreviousNonComment();
1315 if (!PrevToken || PrevToken->is(TT_CastRParen))
1316 return TT_UnaryOperator;
1317 if (PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::identifier))
1318 return TT_TrailingUnaryOperator;
1320 return TT_UnaryOperator;
1323 SmallVector<Context, 8> Contexts;
1325 const FormatStyle &Style;
1326 AnnotatedLine &Line;
1327 FormatToken *CurrentToken;
1329 const AdditionalKeywords &Keywords;
1331 // Set of "<" tokens that do not open a template parameter list. If parseAngle
1332 // determines that a specific token can't be a template opener, it will make
1333 // same decision irrespective of the decisions for tokens leading up to it.
1334 // Store this information to prevent this from causing exponential runtime.
1335 llvm::SmallPtrSet<FormatToken *, 16> NonTemplateLess;
1338 static const int PrecedenceUnaryOperator = prec::PointerToMember + 1;
1339 static const int PrecedenceArrowAndPeriod = prec::PointerToMember + 2;
1341 /// \brief Parses binary expressions by inserting fake parenthesis based on
1342 /// operator precedence.
1343 class ExpressionParser {
1345 ExpressionParser(const FormatStyle &Style, const AdditionalKeywords &Keywords,
1346 AnnotatedLine &Line)
1347 : Style(Style), Keywords(Keywords), Current(Line.First) {}
1349 /// \brief Parse expressions with the given operatore precedence.
1350 void parse(int Precedence = 0) {
1351 // Skip 'return' and ObjC selector colons as they are not part of a binary
1353 while (Current && (Current->is(tok::kw_return) ||
1354 (Current->is(tok::colon) &&
1355 Current->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral))))
1358 if (!Current || Precedence > PrecedenceArrowAndPeriod)
1361 // Conditional expressions need to be parsed separately for proper nesting.
1362 if (Precedence == prec::Conditional) {
1363 parseConditionalExpr();
1367 // Parse unary operators, which all have a higher precedence than binary
1369 if (Precedence == PrecedenceUnaryOperator) {
1370 parseUnaryOperator();
1374 FormatToken *Start = Current;
1375 FormatToken *LatestOperator = nullptr;
1376 unsigned OperatorIndex = 0;
1379 // Consume operators with higher precedence.
1380 parse(Precedence + 1);
1382 int CurrentPrecedence = getCurrentPrecedence();
1384 if (Current && Current->is(TT_SelectorName) &&
1385 Precedence == CurrentPrecedence) {
1387 addFakeParenthesis(Start, prec::Level(Precedence));
1391 // At the end of the line or when an operator with higher precedence is
1392 // found, insert fake parenthesis and return.
1393 if (!Current || (Current->closesScope() && Current->MatchingParen) ||
1394 (CurrentPrecedence != -1 && CurrentPrecedence < Precedence) ||
1395 (CurrentPrecedence == prec::Conditional &&
1396 Precedence == prec::Assignment && Current->is(tok::colon))) {
1400 // Consume scopes: (), [], <> and {}
1401 if (Current->opensScope()) {
1402 while (Current && !Current->closesScope()) {
1409 if (CurrentPrecedence == Precedence) {
1411 LatestOperator->NextOperator = Current;
1412 LatestOperator = Current;
1413 Current->OperatorIndex = OperatorIndex;
1416 next(/*SkipPastLeadingComments=*/Precedence > 0);
1420 if (LatestOperator && (Current || Precedence > 0)) {
1421 // LatestOperator->LastOperator = true;
1422 if (Precedence == PrecedenceArrowAndPeriod) {
1423 // Call expressions don't have a binary operator precedence.
1424 addFakeParenthesis(Start, prec::Unknown);
1426 addFakeParenthesis(Start, prec::Level(Precedence));
1432 /// \brief Gets the precedence (+1) of the given token for binary operators
1433 /// and other tokens that we treat like binary operators.
1434 int getCurrentPrecedence() {
1436 const FormatToken *NextNonComment = Current->getNextNonComment();
1437 if (Current->is(TT_ConditionalExpr))
1438 return prec::Conditional;
1439 if (NextNonComment && NextNonComment->is(tok::colon) &&
1440 NextNonComment->is(TT_DictLiteral))
1442 if (Current->is(TT_LambdaArrow))
1444 if (Current->is(TT_JsFatArrow))
1445 return prec::Assignment;
1446 if (Current->isOneOf(tok::semi, TT_InlineASMColon, TT_SelectorName,
1447 TT_JsComputedPropertyName) ||
1448 (Current->is(tok::comment) && NextNonComment &&
1449 NextNonComment->is(TT_SelectorName)))
1451 if (Current->is(TT_RangeBasedForLoopColon))
1453 if ((Style.Language == FormatStyle::LK_Java ||
1454 Style.Language == FormatStyle::LK_JavaScript) &&
1455 Current->is(Keywords.kw_instanceof))
1456 return prec::Relational;
1457 if (Style.Language == FormatStyle::LK_JavaScript &&
1458 Current->is(Keywords.kw_in))
1459 return prec::Relational;
1460 if (Current->is(TT_BinaryOperator) || Current->is(tok::comma))
1461 return Current->getPrecedence();
1462 if (Current->isOneOf(tok::period, tok::arrow))
1463 return PrecedenceArrowAndPeriod;
1464 if ((Style.Language == FormatStyle::LK_Java ||
1465 Style.Language == FormatStyle::LK_JavaScript) &&
1466 Current->isOneOf(Keywords.kw_extends, Keywords.kw_implements,
1467 Keywords.kw_throws))
1473 void addFakeParenthesis(FormatToken *Start, prec::Level Precedence) {
1474 Start->FakeLParens.push_back(Precedence);
1475 if (Precedence > prec::Unknown)
1476 Start->StartsBinaryExpression = true;
1478 FormatToken *Previous = Current->Previous;
1479 while (Previous->is(tok::comment) && Previous->Previous)
1480 Previous = Previous->Previous;
1481 ++Previous->FakeRParens;
1482 if (Precedence > prec::Unknown)
1483 Previous->EndsBinaryExpression = true;
1487 /// \brief Parse unary operator expressions and surround them with fake
1488 /// parentheses if appropriate.
1489 void parseUnaryOperator() {
1490 if (!Current || Current->isNot(TT_UnaryOperator)) {
1491 parse(PrecedenceArrowAndPeriod);
1495 FormatToken *Start = Current;
1497 parseUnaryOperator();
1499 // The actual precedence doesn't matter.
1500 addFakeParenthesis(Start, prec::Unknown);
1503 void parseConditionalExpr() {
1504 while (Current && Current->isTrailingComment()) {
1507 FormatToken *Start = Current;
1508 parse(prec::LogicalOr);
1509 if (!Current || !Current->is(tok::question))
1512 parse(prec::Assignment);
1513 if (!Current || Current->isNot(TT_ConditionalExpr))
1516 parse(prec::Assignment);
1517 addFakeParenthesis(Start, prec::Conditional);
1520 void next(bool SkipPastLeadingComments = true) {
1522 Current = Current->Next;
1524 (Current->NewlinesBefore == 0 || SkipPastLeadingComments) &&
1525 Current->isTrailingComment())
1526 Current = Current->Next;
1529 const FormatStyle &Style;
1530 const AdditionalKeywords &Keywords;
1531 FormatToken *Current;
1534 } // end anonymous namespace
1536 void TokenAnnotator::setCommentLineLevels(
1537 SmallVectorImpl<AnnotatedLine *> &Lines) {
1538 const AnnotatedLine *NextNonCommentLine = nullptr;
1539 for (SmallVectorImpl<AnnotatedLine *>::reverse_iterator I = Lines.rbegin(),
1542 if (NextNonCommentLine && (*I)->First->is(tok::comment) &&
1543 (*I)->First->Next == nullptr)
1544 (*I)->Level = NextNonCommentLine->Level;
1546 NextNonCommentLine = (*I)->First->isNot(tok::r_brace) ? (*I) : nullptr;
1548 setCommentLineLevels((*I)->Children);
1552 void TokenAnnotator::annotate(AnnotatedLine &Line) {
1553 for (SmallVectorImpl<AnnotatedLine *>::iterator I = Line.Children.begin(),
1554 E = Line.Children.end();
1558 AnnotatingParser Parser(Style, Line, Keywords);
1559 Line.Type = Parser.parseLine();
1560 if (Line.Type == LT_Invalid)
1563 ExpressionParser ExprParser(Style, Keywords, Line);
1566 if (Line.startsWith(TT_ObjCMethodSpecifier))
1567 Line.Type = LT_ObjCMethodDecl;
1568 else if (Line.startsWith(TT_ObjCDecl))
1569 Line.Type = LT_ObjCDecl;
1570 else if (Line.startsWith(TT_ObjCProperty))
1571 Line.Type = LT_ObjCProperty;
1573 Line.First->SpacesRequiredBefore = 1;
1574 Line.First->CanBreakBefore = Line.First->MustBreakBefore;
1577 // This function heuristically determines whether 'Current' starts the name of a
1578 // function declaration.
1579 static bool isFunctionDeclarationName(const FormatToken &Current,
1580 const AnnotatedLine &Line) {
1581 auto skipOperatorName = [](const FormatToken* Next) -> const FormatToken* {
1582 for (; Next; Next = Next->Next) {
1583 if (Next->is(TT_OverloadedOperatorLParen))
1585 if (Next->is(TT_OverloadedOperator))
1587 if (Next->isOneOf(tok::kw_new, tok::kw_delete)) {
1588 // For 'new[]' and 'delete[]'.
1589 if (Next->Next && Next->Next->is(tok::l_square) &&
1590 Next->Next->Next && Next->Next->Next->is(tok::r_square))
1591 Next = Next->Next->Next;
1600 // Find parentheses of parameter list.
1601 const FormatToken *Next = Current.Next;
1602 if (Current.is(tok::kw_operator)) {
1603 if (Current.Previous && Current.Previous->is(tok::coloncolon))
1605 Next = skipOperatorName(Next);
1607 if (!Current.is(TT_StartOfName) || Current.NestingLevel != 0)
1609 for (; Next; Next = Next->Next) {
1610 if (Next->is(TT_TemplateOpener)) {
1611 Next = Next->MatchingParen;
1612 } else if (Next->is(tok::coloncolon)) {
1616 if (Next->is(tok::kw_operator)) {
1617 Next = skipOperatorName(Next->Next);
1620 if (!Next->is(tok::identifier))
1622 } else if (Next->is(tok::l_paren)) {
1630 // Check whether parameter list can be long to a function declaration.
1631 if (!Next || !Next->is(tok::l_paren) || !Next->MatchingParen)
1633 // If the lines ends with "{", this is likely an function definition.
1634 if (Line.Last->is(tok::l_brace))
1636 if (Next->Next == Next->MatchingParen)
1637 return true; // Empty parentheses.
1638 // If there is an &/&& after the r_paren, this is likely a function.
1639 if (Next->MatchingParen->Next &&
1640 Next->MatchingParen->Next->is(TT_PointerOrReference))
1642 for (const FormatToken *Tok = Next->Next; Tok && Tok != Next->MatchingParen;
1644 if (Tok->is(tok::kw_const) || Tok->isSimpleTypeSpecifier() ||
1645 Tok->isOneOf(TT_PointerOrReference, TT_StartOfName, tok::ellipsis))
1647 if (Tok->isOneOf(tok::l_brace, tok::string_literal, TT_ObjCMethodExpr) ||
1648 Tok->Tok.isLiteral())
1654 bool TokenAnnotator::mustBreakForReturnType(const AnnotatedLine &Line) const {
1655 assert(Line.MightBeFunctionDecl);
1657 if ((Style.AlwaysBreakAfterReturnType == FormatStyle::RTBS_TopLevel ||
1658 Style.AlwaysBreakAfterReturnType ==
1659 FormatStyle::RTBS_TopLevelDefinitions) &&
1663 switch (Style.AlwaysBreakAfterReturnType) {
1664 case FormatStyle::RTBS_None:
1666 case FormatStyle::RTBS_All:
1667 case FormatStyle::RTBS_TopLevel:
1669 case FormatStyle::RTBS_AllDefinitions:
1670 case FormatStyle::RTBS_TopLevelDefinitions:
1671 return Line.mightBeFunctionDefinition();
1677 void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) {
1678 for (SmallVectorImpl<AnnotatedLine *>::iterator I = Line.Children.begin(),
1679 E = Line.Children.end();
1681 calculateFormattingInformation(**I);
1684 Line.First->TotalLength =
1685 Line.First->IsMultiline ? Style.ColumnLimit : Line.First->ColumnWidth;
1686 if (!Line.First->Next)
1688 FormatToken *Current = Line.First->Next;
1689 bool InFunctionDecl = Line.MightBeFunctionDecl;
1691 if (isFunctionDeclarationName(*Current, Line))
1692 Current->Type = TT_FunctionDeclarationName;
1693 if (Current->is(TT_LineComment)) {
1694 if (Current->Previous->BlockKind == BK_BracedInit &&
1695 Current->Previous->opensScope())
1696 Current->SpacesRequiredBefore = Style.Cpp11BracedListStyle ? 0 : 1;
1698 Current->SpacesRequiredBefore = Style.SpacesBeforeTrailingComments;
1700 // If we find a trailing comment, iterate backwards to determine whether
1701 // it seems to relate to a specific parameter. If so, break before that
1702 // parameter to avoid changing the comment's meaning. E.g. don't move 'b'
1703 // to the previous line in:
1707 if (!Current->HasUnescapedNewline) {
1708 for (FormatToken *Parameter = Current->Previous; Parameter;
1709 Parameter = Parameter->Previous) {
1710 if (Parameter->isOneOf(tok::comment, tok::r_brace))
1712 if (Parameter->Previous && Parameter->Previous->is(tok::comma)) {
1713 if (!Parameter->Previous->is(TT_CtorInitializerComma) &&
1714 Parameter->HasUnescapedNewline)
1715 Parameter->MustBreakBefore = true;
1720 } else if (Current->SpacesRequiredBefore == 0 &&
1721 spaceRequiredBefore(Line, *Current)) {
1722 Current->SpacesRequiredBefore = 1;
1725 Current->MustBreakBefore =
1726 Current->MustBreakBefore || mustBreakBefore(Line, *Current);
1728 if (!Current->MustBreakBefore && InFunctionDecl &&
1729 Current->is(TT_FunctionDeclarationName))
1730 Current->MustBreakBefore = mustBreakForReturnType(Line);
1732 Current->CanBreakBefore =
1733 Current->MustBreakBefore || canBreakBefore(Line, *Current);
1734 unsigned ChildSize = 0;
1735 if (Current->Previous->Children.size() == 1) {
1736 FormatToken &LastOfChild = *Current->Previous->Children[0]->Last;
1737 ChildSize = LastOfChild.isTrailingComment() ? Style.ColumnLimit
1738 : LastOfChild.TotalLength + 1;
1740 const FormatToken *Prev = Current->Previous;
1741 if (Current->MustBreakBefore || Prev->Children.size() > 1 ||
1742 (Prev->Children.size() == 1 &&
1743 Prev->Children[0]->First->MustBreakBefore) ||
1744 Current->IsMultiline)
1745 Current->TotalLength = Prev->TotalLength + Style.ColumnLimit;
1747 Current->TotalLength = Prev->TotalLength + Current->ColumnWidth +
1748 ChildSize + Current->SpacesRequiredBefore;
1750 if (Current->is(TT_CtorInitializerColon))
1751 InFunctionDecl = false;
1753 // FIXME: Only calculate this if CanBreakBefore is true once static
1754 // initializers etc. are sorted out.
1755 // FIXME: Move magic numbers to a better place.
1756 Current->SplitPenalty = 20 * Current->BindingStrength +
1757 splitPenalty(Line, *Current, InFunctionDecl);
1759 Current = Current->Next;
1762 calculateUnbreakableTailLengths(Line);
1763 for (Current = Line.First; Current != nullptr; Current = Current->Next) {
1765 Current->Role->precomputeFormattingInfos(Current);
1768 DEBUG({ printDebugInfo(Line); });
1771 void TokenAnnotator::calculateUnbreakableTailLengths(AnnotatedLine &Line) {
1772 unsigned UnbreakableTailLength = 0;
1773 FormatToken *Current = Line.Last;
1775 Current->UnbreakableTailLength = UnbreakableTailLength;
1776 if (Current->CanBreakBefore ||
1777 Current->isOneOf(tok::comment, tok::string_literal)) {
1778 UnbreakableTailLength = 0;
1780 UnbreakableTailLength +=
1781 Current->ColumnWidth + Current->SpacesRequiredBefore;
1783 Current = Current->Previous;
1787 unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
1788 const FormatToken &Tok,
1789 bool InFunctionDecl) {
1790 const FormatToken &Left = *Tok.Previous;
1791 const FormatToken &Right = Tok;
1793 if (Left.is(tok::semi))
1796 if (Style.Language == FormatStyle::LK_Java) {
1797 if (Right.isOneOf(Keywords.kw_extends, Keywords.kw_throws))
1799 if (Right.is(Keywords.kw_implements))
1801 if (Left.is(tok::comma) && Left.NestingLevel == 0)
1803 } else if (Style.Language == FormatStyle::LK_JavaScript) {
1804 if (Right.is(Keywords.kw_function) && Left.isNot(tok::comma))
1806 if (Left.is(TT_JsTypeColon))
1810 if (Left.is(tok::comma) || (Right.is(tok::identifier) && Right.Next &&
1811 Right.Next->is(TT_DictLiteral)))
1813 if (Right.is(tok::l_square)) {
1814 if (Style.Language == FormatStyle::LK_Proto)
1816 if (Left.is(tok::r_square))
1818 // Slightly prefer formatting local lambda definitions like functions.
1819 if (Right.is(TT_LambdaLSquare) && Left.is(tok::equal))
1821 if (!Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare,
1822 TT_ArrayInitializerLSquare))
1826 if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
1827 Right.is(tok::kw_operator)) {
1828 if (Line.startsWith(tok::kw_for) && Right.PartOfMultiVariableDeclStmt)
1830 if (Left.is(TT_StartOfName))
1832 if (InFunctionDecl && Right.NestingLevel == 0)
1833 return Style.PenaltyReturnTypeOnItsOwnLine;
1836 if (Right.is(TT_PointerOrReference))
1838 if (Right.is(TT_LambdaArrow))
1840 if (Left.is(tok::equal) && Right.is(tok::l_brace))
1842 if (Left.is(TT_CastRParen))
1844 if (Left.is(tok::coloncolon) ||
1845 (Right.is(tok::period) && Style.Language == FormatStyle::LK_Proto))
1847 if (Left.isOneOf(tok::kw_class, tok::kw_struct))
1849 if (Left.is(tok::comment))
1852 if (Left.isOneOf(TT_RangeBasedForLoopColon, TT_InheritanceColon))
1855 if (Right.isMemberAccess()) {
1856 // Breaking before the "./->" of a chained call/member access is reasonably
1857 // cheap, as formatting those with one call per line is generally
1858 // desirable. In particular, it should be cheaper to break before the call
1859 // than it is to break inside a call's parameters, which could lead to weird
1860 // "hanging" indents. The exception is the very last "./->" to support this
1861 // frequent pattern:
1863 // aaaaaaaa.aaaaaaaa.bbbbbbb().ccccccccccccccccccccc(
1866 // which might otherwise be blown up onto many lines. Here, clang-format
1867 // won't produce "hanging" indents anyway as there is no other trailing
1870 // Also apply higher penalty is not a call as that might lead to a wrapping
1874 // .aaaaaaaaa.bbbbbbbb(cccccccc);
1875 return !Right.NextOperator || !Right.NextOperator->Previous->closesScope()
1880 if (Right.is(TT_TrailingAnnotation) &&
1881 (!Right.Next || Right.Next->isNot(tok::l_paren))) {
1882 // Moving trailing annotations to the next line is fine for ObjC method
1884 if (Line.startsWith(TT_ObjCMethodSpecifier))
1886 // Generally, breaking before a trailing annotation is bad unless it is
1887 // function-like. It seems to be especially preferable to keep standard
1888 // annotations (i.e. "const", "final" and "override") on the same line.
1889 // Use a slightly higher penalty after ")" so that annotations like
1890 // "const override" are kept together.
1891 bool is_short_annotation = Right.TokenText.size() < 10;
1892 return (Left.is(tok::r_paren) ? 100 : 120) + (is_short_annotation ? 50 : 0);
1895 // In for-loops, prefer breaking at ',' and ';'.
1896 if (Line.startsWith(tok::kw_for) && Left.is(tok::equal))
1899 // In Objective-C method expressions, prefer breaking before "param:" over
1900 // breaking after it.
1901 if (Right.is(TT_SelectorName))
1903 if (Left.is(tok::colon) && Left.is(TT_ObjCMethodExpr))
1904 return Line.MightBeFunctionDecl ? 50 : 500;
1906 if (Left.is(tok::l_paren) && InFunctionDecl &&
1907 Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign)
1909 if (Left.is(tok::l_paren) && Left.Previous &&
1910 Left.Previous->isOneOf(tok::kw_if, tok::kw_for))
1912 if (Left.is(tok::equal) && InFunctionDecl)
1914 if (Right.is(tok::r_brace))
1916 if (Left.is(TT_TemplateOpener))
1918 if (Left.opensScope()) {
1919 if (Style.AlignAfterOpenBracket == FormatStyle::BAS_DontAlign)
1921 return Left.ParameterCount > 1 ? Style.PenaltyBreakBeforeFirstCallParameter
1924 if (Left.is(TT_JavaAnnotation))
1927 if (Right.is(tok::lessless)) {
1928 if (Left.is(tok::string_literal) &&
1929 (Right.NextOperator || Right.OperatorIndex != 1)) {
1930 StringRef Content = Left.TokenText;
1931 if (Content.startswith("\""))
1932 Content = Content.drop_front(1);
1933 if (Content.endswith("\""))
1934 Content = Content.drop_back(1);
1935 Content = Content.trim();
1936 if (Content.size() > 1 &&
1937 (Content.back() == ':' || Content.back() == '='))
1940 return 1; // Breaking at a << is really cheap.
1942 if (Left.is(TT_ConditionalExpr))
1943 return prec::Conditional;
1944 prec::Level Level = Left.getPrecedence();
1945 if (Level != prec::Unknown)
1947 Level = Right.getPrecedence();
1948 if (Level != prec::Unknown)
1954 bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
1955 const FormatToken &Left,
1956 const FormatToken &Right) {
1957 if (Left.is(tok::kw_return) && Right.isNot(tok::semi))
1959 if (Style.ObjCSpaceAfterProperty && Line.Type == LT_ObjCProperty &&
1960 Left.Tok.getObjCKeywordID() == tok::objc_property)
1962 if (Right.is(tok::hashhash))
1963 return Left.is(tok::hash);
1964 if (Left.isOneOf(tok::hashhash, tok::hash))
1965 return Right.is(tok::hash);
1966 if (Left.is(tok::l_paren) && Right.is(tok::r_paren))
1967 return Style.SpaceInEmptyParentheses;
1968 if (Left.is(tok::l_paren) || Right.is(tok::r_paren))
1969 return (Right.is(TT_CastRParen) ||
1970 (Left.MatchingParen && Left.MatchingParen->is(TT_CastRParen)))
1971 ? Style.SpacesInCStyleCastParentheses
1972 : Style.SpacesInParentheses;
1973 if (Right.isOneOf(tok::semi, tok::comma))
1975 if (Right.is(tok::less) &&
1976 (Left.is(tok::kw_template) ||
1977 (Line.Type == LT_ObjCDecl && Style.ObjCSpaceBeforeProtocolList)))
1979 if (Left.isOneOf(tok::exclaim, tok::tilde))
1981 if (Left.is(tok::at) &&
1982 Right.isOneOf(tok::identifier, tok::string_literal, tok::char_constant,
1983 tok::numeric_constant, tok::l_paren, tok::l_brace,
1984 tok::kw_true, tok::kw_false))
1986 if (Left.is(tok::colon))
1987 return !Left.is(TT_ObjCMethodExpr);
1988 if (Left.is(tok::coloncolon))
1990 if (Left.is(tok::less) || Right.isOneOf(tok::greater, tok::less))
1992 if (Right.is(tok::ellipsis))
1993 return Left.Tok.isLiteral() || (Left.is(tok::identifier) && Left.Previous &&
1994 Left.Previous->is(tok::kw_case));
1995 if (Left.is(tok::l_square) && Right.is(tok::amp))
1997 if (Right.is(TT_PointerOrReference))
1998 return (Left.is(tok::r_paren) && Line.MightBeFunctionDecl) ||
1999 (Left.Tok.isLiteral() || (Left.is(tok::kw_const) && Left.Previous &&
2000 Left.Previous->is(tok::r_paren)) ||
2001 (!Left.isOneOf(TT_PointerOrReference, tok::l_paren) &&
2002 (Style.PointerAlignment != FormatStyle::PAS_Left ||
2003 Line.IsMultiVariableDeclStmt)));
2004 if (Right.is(TT_FunctionTypeLParen) && Left.isNot(tok::l_paren) &&
2005 (!Left.is(TT_PointerOrReference) ||
2006 (Style.PointerAlignment != FormatStyle::PAS_Right &&
2007 !Line.IsMultiVariableDeclStmt)))
2009 if (Left.is(TT_PointerOrReference))
2010 return Right.Tok.isLiteral() ||
2011 Right.isOneOf(TT_BlockComment, Keywords.kw_final,
2012 Keywords.kw_override) ||
2013 (Right.is(tok::l_brace) && Right.BlockKind == BK_Block) ||
2014 (!Right.isOneOf(TT_PointerOrReference, TT_ArraySubscriptLSquare,
2016 (Style.PointerAlignment != FormatStyle::PAS_Right &&
2017 !Line.IsMultiVariableDeclStmt) &&
2019 !Left.Previous->isOneOf(tok::l_paren, tok::coloncolon));
2020 if (Right.is(tok::star) && Left.is(tok::l_paren))
2022 if (Left.is(tok::l_square))
2023 return (Left.is(TT_ArrayInitializerLSquare) &&
2024 Style.SpacesInContainerLiterals && Right.isNot(tok::r_square)) ||
2025 (Left.is(TT_ArraySubscriptLSquare) && Style.SpacesInSquareBrackets &&
2026 Right.isNot(tok::r_square));
2027 if (Right.is(tok::r_square))
2028 return Right.MatchingParen &&
2029 ((Style.SpacesInContainerLiterals &&
2030 Right.MatchingParen->is(TT_ArrayInitializerLSquare)) ||
2031 (Style.SpacesInSquareBrackets &&
2032 Right.MatchingParen->is(TT_ArraySubscriptLSquare)));
2033 if (Right.is(tok::l_square) &&
2034 !Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare) &&
2035 !Left.isOneOf(tok::numeric_constant, TT_DictLiteral))
2037 if (Left.is(tok::l_brace) && Right.is(tok::r_brace))
2038 return !Left.Children.empty(); // No spaces in "{}".
2039 if ((Left.is(tok::l_brace) && Left.BlockKind != BK_Block) ||
2040 (Right.is(tok::r_brace) && Right.MatchingParen &&
2041 Right.MatchingParen->BlockKind != BK_Block))
2042 return !Style.Cpp11BracedListStyle;
2043 if (Left.is(TT_BlockComment))
2044 return !Left.TokenText.endswith("=*/");
2045 if (Right.is(tok::l_paren)) {
2046 if (Left.is(tok::r_paren) && Left.is(TT_AttributeParen))
2048 return Line.Type == LT_ObjCDecl || Left.is(tok::semi) ||
2049 (Style.SpaceBeforeParens != FormatStyle::SBPO_Never &&
2050 (Left.isOneOf(tok::kw_if, tok::pp_elif, tok::kw_for, tok::kw_while,
2051 tok::kw_switch, tok::kw_case, TT_ForEachMacro,
2053 (Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch,
2054 tok::kw_new, tok::kw_delete) &&
2055 (!Left.Previous || Left.Previous->isNot(tok::period))))) ||
2056 (Style.SpaceBeforeParens == FormatStyle::SBPO_Always &&
2057 (Left.is(tok::identifier) || Left.isFunctionLikeKeyword() ||
2058 Left.is(tok::r_paren)) &&
2059 Line.Type != LT_PreprocessorDirective);
2061 if (Left.is(tok::at) && Right.Tok.getObjCKeywordID() != tok::objc_not_keyword)
2063 if (Right.is(TT_UnaryOperator))
2064 return !Left.isOneOf(tok::l_paren, tok::l_square, tok::at) &&
2065 (Left.isNot(tok::colon) || Left.isNot(TT_ObjCMethodExpr));
2066 if ((Left.isOneOf(tok::identifier, tok::greater, tok::r_square,
2068 Left.isSimpleTypeSpecifier()) &&
2069 Right.is(tok::l_brace) && Right.getNextNonComment() &&
2070 Right.BlockKind != BK_Block)
2072 if (Left.is(tok::period) || Right.is(tok::period))
2074 if (Right.is(tok::hash) && Left.is(tok::identifier) && Left.TokenText == "L")
2076 if (Left.is(TT_TemplateCloser) && Left.MatchingParen &&
2077 Left.MatchingParen->Previous &&
2078 Left.MatchingParen->Previous->is(tok::period))
2079 // A.<B>DoSomething();
2081 if (Left.is(TT_TemplateCloser) && Right.is(tok::l_square))
2086 bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
2087 const FormatToken &Right) {
2088 const FormatToken &Left = *Right.Previous;
2089 if (Right.Tok.getIdentifierInfo() && Left.Tok.getIdentifierInfo())
2090 return true; // Never ever merge two identifiers.
2091 if (Style.Language == FormatStyle::LK_Cpp) {
2092 if (Left.is(tok::kw_operator))
2093 return Right.is(tok::coloncolon);
2094 } else if (Style.Language == FormatStyle::LK_Proto) {
2095 if (Right.is(tok::period) &&
2096 Left.isOneOf(Keywords.kw_optional, Keywords.kw_required,
2097 Keywords.kw_repeated, Keywords.kw_extend))
2099 if (Right.is(tok::l_paren) &&
2100 Left.isOneOf(Keywords.kw_returns, Keywords.kw_option))
2102 } else if (Style.Language == FormatStyle::LK_JavaScript) {
2103 if (Left.is(TT_JsFatArrow))
2105 if (Right.is(tok::star) &&
2106 Left.isOneOf(Keywords.kw_function, Keywords.kw_yield))
2108 if (Left.isOneOf(Keywords.kw_let, Keywords.kw_var, Keywords.kw_in,
2109 Keywords.kw_of, tok::kw_const) &&
2110 (!Left.Previous || !Left.Previous->is(tok::period)))
2112 if (Left.is(tok::kw_default) && Left.Previous &&
2113 Left.Previous->is(tok::kw_export))
2115 if (Left.is(Keywords.kw_is) && Right.is(tok::l_brace))
2117 if (Right.isOneOf(TT_JsTypeColon, TT_JsTypeOptionalQuestion))
2119 if (Left.is(TT_JsTypeOperator) || Right.is(TT_JsTypeOperator))
2121 if ((Left.is(tok::l_brace) || Right.is(tok::r_brace)) &&
2122 Line.First->isOneOf(Keywords.kw_import, tok::kw_export))
2124 if (Left.is(tok::ellipsis))
2126 if (Left.is(TT_TemplateCloser) &&
2127 !Right.isOneOf(tok::equal, tok::l_brace, tok::comma, tok::l_square,
2128 Keywords.kw_implements, Keywords.kw_extends))
2129 // Type assertions ('<type>expr') are not followed by whitespace. Other
2130 // locations that should have whitespace following are identified by the
2131 // above set of follower tokens.
2133 // Postfix non-null assertion operator, as in `foo!.bar()`.
2134 if (Right.is(tok::exclaim) && (Left.isOneOf(tok::identifier, tok::r_paren,
2135 tok::r_square, tok::r_brace) ||
2136 Left.Tok.isLiteral()))
2138 } else if (Style.Language == FormatStyle::LK_Java) {
2139 if (Left.is(tok::r_square) && Right.is(tok::l_brace))
2141 if (Left.is(Keywords.kw_synchronized) && Right.is(tok::l_paren))
2142 return Style.SpaceBeforeParens != FormatStyle::SBPO_Never;
2143 if ((Left.isOneOf(tok::kw_static, tok::kw_public, tok::kw_private,
2144 tok::kw_protected) ||
2145 Left.isOneOf(Keywords.kw_final, Keywords.kw_abstract,
2146 Keywords.kw_native)) &&
2147 Right.is(TT_TemplateOpener))
2150 if (Left.is(TT_ImplicitStringLiteral))
2151 return Right.WhitespaceRange.getBegin() != Right.WhitespaceRange.getEnd();
2152 if (Line.Type == LT_ObjCMethodDecl) {
2153 if (Left.is(TT_ObjCMethodSpecifier))
2155 if (Left.is(tok::r_paren) && Right.is(tok::identifier))
2156 // Don't space between ')' and <id>
2159 if (Line.Type == LT_ObjCProperty &&
2160 (Right.is(tok::equal) || Left.is(tok::equal)))
2163 if (Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow) ||
2164 Left.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow))
2166 if (Right.is(TT_OverloadedOperatorLParen))
2167 return Style.SpaceBeforeParens == FormatStyle::SBPO_Always;
2168 if (Left.is(tok::comma))
2170 if (Right.is(tok::comma))
2172 if (Right.isOneOf(TT_CtorInitializerColon, TT_ObjCBlockLParen))
2174 if (Right.is(tok::colon)) {
2175 if (Line.First->isOneOf(tok::kw_case, tok::kw_default) ||
2176 !Right.getNextNonComment() || Right.getNextNonComment()->is(tok::semi))
2178 if (Right.is(TT_ObjCMethodExpr))
2180 if (Left.is(tok::question))
2182 if (Right.is(TT_InlineASMColon) && Left.is(tok::coloncolon))
2184 if (Right.is(TT_DictLiteral))
2185 return Style.SpacesInContainerLiterals;
2188 if (Left.is(TT_UnaryOperator))
2189 return Right.is(TT_BinaryOperator);
2191 // If the next token is a binary operator or a selector name, we have
2192 // incorrectly classified the parenthesis as a cast. FIXME: Detect correctly.
2193 if (Left.is(TT_CastRParen))
2194 return Style.SpaceAfterCStyleCast ||
2195 Right.isOneOf(TT_BinaryOperator, TT_SelectorName);
2197 if (Left.is(tok::greater) && Right.is(tok::greater))
2198 return Right.is(TT_TemplateCloser) && Left.is(TT_TemplateCloser) &&
2199 (Style.Standard != FormatStyle::LS_Cpp11 || Style.SpacesInAngles);
2200 if (Right.isOneOf(tok::arrow, tok::period, tok::arrowstar, tok::periodstar) ||
2201 Left.isOneOf(tok::arrow, tok::period, tok::arrowstar, tok::periodstar))
2203 if (!Style.SpaceBeforeAssignmentOperators &&
2204 Right.getPrecedence() == prec::Assignment)
2206 if (Right.is(tok::coloncolon) && !Left.isOneOf(tok::l_brace, tok::comment))
2207 return (Left.is(TT_TemplateOpener) &&
2208 Style.Standard == FormatStyle::LS_Cpp03) ||
2209 !(Left.isOneOf(tok::identifier, tok::l_paren, tok::r_paren,
2211 Left.isOneOf(TT_TemplateCloser, TT_TemplateOpener));
2212 if ((Left.is(TT_TemplateOpener)) != (Right.is(TT_TemplateCloser)))
2213 return Style.SpacesInAngles;
2214 if ((Right.is(TT_BinaryOperator) && !Left.is(tok::l_paren)) ||
2215 (Left.isOneOf(TT_BinaryOperator, TT_ConditionalExpr) &&
2216 !Right.is(tok::r_paren)))
2218 if (Left.is(TT_TemplateCloser) && Right.is(tok::l_paren) &&
2219 Right.isNot(TT_FunctionTypeLParen))
2220 return Style.SpaceBeforeParens == FormatStyle::SBPO_Always;
2221 if (Right.is(TT_TemplateOpener) && Left.is(tok::r_paren) &&
2222 Left.MatchingParen && Left.MatchingParen->is(TT_OverloadedOperatorLParen))
2224 if (Right.is(tok::less) && Left.isNot(tok::l_paren) &&
2225 Line.startsWith(tok::hash))
2227 if (Right.is(TT_TrailingUnaryOperator))
2229 if (Left.is(TT_RegexLiteral))
2231 return spaceRequiredBetween(Line, Left, Right);
2234 // Returns 'true' if 'Tok' is a brace we'd want to break before in Allman style.
2235 static bool isAllmanBrace(const FormatToken &Tok) {
2236 return Tok.is(tok::l_brace) && Tok.BlockKind == BK_Block &&
2237 !Tok.isOneOf(TT_ObjCBlockLBrace, TT_DictLiteral);
2240 bool TokenAnnotator::mustBreakBefore(const AnnotatedLine &Line,
2241 const FormatToken &Right) {
2242 const FormatToken &Left = *Right.Previous;
2243 if (Right.NewlinesBefore > 1 && Style.MaxEmptyLinesToKeep > 0)
2246 if (Style.Language == FormatStyle::LK_JavaScript) {
2247 // FIXME: This might apply to other languages and token kinds.
2248 if (Right.is(tok::string_literal) && Left.is(tok::plus) && Left.Previous &&
2249 Left.Previous->is(tok::string_literal))
2251 if (Left.is(TT_DictLiteral) && Left.is(tok::l_brace) && Line.Level == 0 &&
2252 Left.Previous && Left.Previous->is(tok::equal) &&
2253 Line.First->isOneOf(tok::identifier, Keywords.kw_import, tok::kw_export,
2255 // kw_var/kw_let are pseudo-tokens that are tok::identifier, so match
2257 !Line.First->isOneOf(Keywords.kw_var, Keywords.kw_let))
2258 // Object literals on the top level of a file are treated as "enum-style".
2259 // Each key/value pair is put on a separate line, instead of bin-packing.
2261 if (Left.is(tok::l_brace) && Line.Level == 0 &&
2262 (Line.startsWith(tok::kw_enum) ||
2263 Line.startsWith(tok::kw_export, tok::kw_enum)))
2264 // JavaScript top-level enum key/value pairs are put on separate lines
2265 // instead of bin-packing.
2267 if (Right.is(tok::r_brace) && Left.is(tok::l_brace) &&
2268 !Left.Children.empty())
2269 // Support AllowShortFunctionsOnASingleLine for JavaScript.
2270 return Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_None ||
2271 Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_Empty ||
2272 (Left.NestingLevel == 0 && Line.Level == 0 &&
2273 Style.AllowShortFunctionsOnASingleLine ==
2274 FormatStyle::SFS_Inline);
2275 } else if (Style.Language == FormatStyle::LK_Java) {
2276 if (Right.is(tok::plus) && Left.is(tok::string_literal) && Right.Next &&
2277 Right.Next->is(tok::string_literal))
2281 // If the last token before a '}' is a comma or a trailing comment, the
2282 // intention is to insert a line break after it in order to make shuffling
2283 // around entries easier.
2284 const FormatToken *BeforeClosingBrace = nullptr;
2285 if (Left.isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) &&
2286 Left.BlockKind != BK_Block && Left.MatchingParen)
2287 BeforeClosingBrace = Left.MatchingParen->Previous;
2288 else if (Right.MatchingParen &&
2289 Right.MatchingParen->isOneOf(tok::l_brace,
2290 TT_ArrayInitializerLSquare))
2291 BeforeClosingBrace = &Left;
2292 if (BeforeClosingBrace && (BeforeClosingBrace->is(tok::comma) ||
2293 BeforeClosingBrace->isTrailingComment()))
2296 if (Right.is(tok::comment))
2297 return Left.BlockKind != BK_BracedInit &&
2298 Left.isNot(TT_CtorInitializerColon) &&
2299 (Right.NewlinesBefore > 0 && Right.HasUnescapedNewline);
2300 if (Left.isTrailingComment())
2302 if (Left.isStringLiteral() &&
2303 (Right.isStringLiteral() || Right.is(TT_ObjCStringLiteral)))
2305 if (Right.Previous->IsUnterminatedLiteral)
2307 if (Right.is(tok::lessless) && Right.Next &&
2308 Right.Previous->is(tok::string_literal) &&
2309 Right.Next->is(tok::string_literal))
2311 if (Right.Previous->ClosesTemplateDeclaration &&
2312 Right.Previous->MatchingParen &&
2313 Right.Previous->MatchingParen->NestingLevel == 0 &&
2314 Style.AlwaysBreakTemplateDeclarations)
2316 if ((Right.isOneOf(TT_CtorInitializerComma, TT_CtorInitializerColon)) &&
2317 Style.BreakConstructorInitializersBeforeComma &&
2318 !Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
2320 if (Right.is(tok::string_literal) && Right.TokenText.startswith("R\""))
2321 // Raw string literals are special wrt. line breaks. The author has made a
2322 // deliberate choice and might have aligned the contents of the string
2323 // literal accordingly. Thus, we try keep existing line breaks.
2324 return Right.NewlinesBefore > 0;
2325 if (Right.Previous->is(tok::l_brace) && Right.NestingLevel == 1 &&
2326 Style.Language == FormatStyle::LK_Proto)
2327 // Don't put enums onto single lines in protocol buffers.
2329 if (Right.is(TT_InlineASMBrace))
2330 return Right.HasUnescapedNewline;
2331 if (isAllmanBrace(Left) || isAllmanBrace(Right))
2332 return (Line.startsWith(tok::kw_enum) && Style.BraceWrapping.AfterEnum) ||
2333 (Line.startsWith(tok::kw_class) && Style.BraceWrapping.AfterClass) ||
2334 (Line.startsWith(tok::kw_struct) && Style.BraceWrapping.AfterStruct);
2335 if (Left.is(TT_ObjCBlockLBrace) && !Style.AllowShortBlocksOnASingleLine)
2338 if ((Style.Language == FormatStyle::LK_Java ||
2339 Style.Language == FormatStyle::LK_JavaScript) &&
2340 Left.is(TT_LeadingJavaAnnotation) &&
2341 Right.isNot(TT_LeadingJavaAnnotation) && Right.isNot(tok::l_paren) &&
2342 (Line.Last->is(tok::l_brace) || Style.BreakAfterJavaFieldAnnotations))
2348 bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
2349 const FormatToken &Right) {
2350 const FormatToken &Left = *Right.Previous;
2352 // Language-specific stuff.
2353 if (Style.Language == FormatStyle::LK_Java) {
2354 if (Left.isOneOf(Keywords.kw_throws, Keywords.kw_extends,
2355 Keywords.kw_implements))
2357 if (Right.isOneOf(Keywords.kw_throws, Keywords.kw_extends,
2358 Keywords.kw_implements))
2360 } else if (Style.Language == FormatStyle::LK_JavaScript) {
2361 if (Left.is(tok::kw_return))
2362 return false; // Otherwise a semicolon is inserted.
2363 if (Left.is(TT_JsFatArrow) && Right.is(tok::l_brace))
2365 if (Left.is(TT_JsTypeColon))
2367 if (Right.NestingLevel == 0 && Right.is(Keywords.kw_is))
2369 if (Left.is(Keywords.kw_in))
2370 return Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None;
2371 if (Right.is(Keywords.kw_in))
2372 return Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None;
2373 if (Right.is(Keywords.kw_as))
2374 return false; // must not break before as in 'x as type' casts
2377 if (Left.is(tok::at))
2379 if (Left.Tok.getObjCKeywordID() == tok::objc_interface)
2381 if (Left.isOneOf(TT_JavaAnnotation, TT_LeadingJavaAnnotation))
2382 return !Right.is(tok::l_paren);
2383 if (Right.is(TT_PointerOrReference))
2384 return Line.IsMultiVariableDeclStmt ||
2385 (Style.PointerAlignment == FormatStyle::PAS_Right &&
2386 (!Right.Next || Right.Next->isNot(TT_FunctionDeclarationName)));
2387 if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
2388 Right.is(tok::kw_operator))
2390 if (Left.is(TT_PointerOrReference))
2392 if (Right.isTrailingComment())
2393 // We rely on MustBreakBefore being set correctly here as we should not
2394 // change the "binding" behavior of a comment.
2395 // The first comment in a braced lists is always interpreted as belonging to
2396 // the first list element. Otherwise, it should be placed outside of the
2398 return Left.BlockKind == BK_BracedInit;
2399 if (Left.is(tok::question) && Right.is(tok::colon))
2401 if (Right.is(TT_ConditionalExpr) || Right.is(tok::question))
2402 return Style.BreakBeforeTernaryOperators;
2403 if (Left.is(TT_ConditionalExpr) || Left.is(tok::question))
2404 return !Style.BreakBeforeTernaryOperators;
2405 if (Right.is(TT_InheritanceColon))
2407 if (Right.is(tok::colon) &&
2408 !Right.isOneOf(TT_CtorInitializerColon, TT_InlineASMColon))
2410 if (Left.is(tok::colon) && (Left.isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)))
2412 if (Right.is(TT_SelectorName) || (Right.is(tok::identifier) && Right.Next &&
2413 Right.Next->is(TT_ObjCMethodExpr)))
2414 return Left.isNot(tok::period); // FIXME: Properly parse ObjC calls.
2415 if (Left.is(tok::r_paren) && Line.Type == LT_ObjCProperty)
2417 if (Left.ClosesTemplateDeclaration || Left.is(TT_FunctionAnnotationRParen))
2419 if (Right.isOneOf(TT_RangeBasedForLoopColon, TT_OverloadedOperatorLParen,
2420 TT_OverloadedOperator))
2422 if (Left.is(TT_RangeBasedForLoopColon))
2424 if (Right.is(TT_RangeBasedForLoopColon))
2426 if (Left.isOneOf(TT_TemplateCloser, TT_UnaryOperator) ||
2427 Left.is(tok::kw_operator))
2429 if (Left.is(tok::equal) && !Right.isOneOf(tok::kw_default, tok::kw_delete) &&
2430 Line.Type == LT_VirtualFunctionDecl && Left.NestingLevel == 0)
2432 if (Left.is(tok::l_paren) && Left.is(TT_AttributeParen))
2434 if (Left.is(tok::l_paren) && Left.Previous &&
2435 (Left.Previous->isOneOf(TT_BinaryOperator, TT_CastRParen)))
2437 if (Right.is(TT_ImplicitStringLiteral))
2440 if (Right.is(tok::r_paren) || Right.is(TT_TemplateCloser))
2442 if (Right.is(tok::r_square) && Right.MatchingParen &&
2443 Right.MatchingParen->is(TT_LambdaLSquare))
2446 // We only break before r_brace if there was a corresponding break before
2447 // the l_brace, which is tracked by BreakBeforeClosingBrace.
2448 if (Right.is(tok::r_brace))
2449 return Right.MatchingParen && Right.MatchingParen->BlockKind == BK_Block;
2451 // Allow breaking after a trailing annotation, e.g. after a method
2453 if (Left.is(TT_TrailingAnnotation))
2454 return !Right.isOneOf(tok::l_brace, tok::semi, tok::equal, tok::l_paren,
2455 tok::less, tok::coloncolon);
2457 if (Right.is(tok::kw___attribute))
2460 if (Left.is(tok::identifier) && Right.is(tok::string_literal))
2463 if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
2466 if (Left.is(TT_CtorInitializerComma) &&
2467 Style.BreakConstructorInitializersBeforeComma)
2469 if (Right.is(TT_CtorInitializerComma) &&
2470 Style.BreakConstructorInitializersBeforeComma)
2472 if ((Left.is(tok::greater) && Right.is(tok::greater)) ||
2473 (Left.is(tok::less) && Right.is(tok::less)))
2475 if (Right.is(TT_BinaryOperator) &&
2476 Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None &&
2477 (Style.BreakBeforeBinaryOperators == FormatStyle::BOS_All ||
2478 Right.getPrecedence() != prec::Assignment))
2480 if (Left.is(TT_ArrayInitializerLSquare))
2482 if (Right.is(tok::kw_typename) && Left.isNot(tok::kw_const))
2484 if ((Left.isBinaryOperator() || Left.is(TT_BinaryOperator)) &&
2485 !Left.isOneOf(tok::arrowstar, tok::lessless) &&
2486 Style.BreakBeforeBinaryOperators != FormatStyle::BOS_All &&
2487 (Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None ||
2488 Left.getPrecedence() == prec::Assignment))
2490 return Left.isOneOf(tok::comma, tok::coloncolon, tok::semi, tok::l_brace,
2491 tok::kw_class, tok::kw_struct, tok::comment) ||
2492 Right.isMemberAccess() ||
2493 Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow, tok::lessless,
2494 tok::colon, tok::l_square, tok::at) ||
2495 (Left.is(tok::r_paren) &&
2496 Right.isOneOf(tok::identifier, tok::kw_const)) ||
2497 (Left.is(tok::l_paren) && !Right.is(tok::r_paren));
2500 void TokenAnnotator::printDebugInfo(const AnnotatedLine &Line) {
2501 llvm::errs() << "AnnotatedTokens:\n";
2502 const FormatToken *Tok = Line.First;
2504 llvm::errs() << " M=" << Tok->MustBreakBefore
2505 << " C=" << Tok->CanBreakBefore
2506 << " T=" << getTokenTypeName(Tok->Type)
2507 << " S=" << Tok->SpacesRequiredBefore
2508 << " B=" << Tok->BlockParameterCount
2509 << " P=" << Tok->SplitPenalty << " Name=" << Tok->Tok.getName()
2510 << " L=" << Tok->TotalLength << " PPK=" << Tok->PackingKind
2512 for (unsigned i = 0, e = Tok->FakeLParens.size(); i != e; ++i)
2513 llvm::errs() << Tok->FakeLParens[i] << "/";
2514 llvm::errs() << " FakeRParens=" << Tok->FakeRParens << "\n";
2516 assert(Tok == Line.Last);
2519 llvm::errs() << "----\n";
2522 } // namespace format
2523 } // namespace clang