1 //===--- UnwrappedLineFormatter.cpp - Format C++ code ---------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #include "UnwrappedLineFormatter.h"
10 #include "NamespaceEndCommentsFixer.h"
11 #include "WhitespaceManager.h"
12 #include "llvm/Support/Debug.h"
15 #define DEBUG_TYPE "format-formatter"
22 bool startsExternCBlock(const AnnotatedLine &Line) {
23 const FormatToken *Next = Line.First->getNextNonComment();
24 const FormatToken *NextNext = Next ? Next->getNextNonComment() : nullptr;
25 return Line.startsWith(tok::kw_extern) && Next && Next->isStringLiteral() &&
26 NextNext && NextNext->is(tok::l_brace);
29 /// Tracks the indent level of \c AnnotatedLines across levels.
31 /// \c nextLine must be called for each \c AnnotatedLine, after which \c
32 /// getIndent() will return the indent for the last line \c nextLine was called
34 /// If the line is not formatted (and thus the indent does not change), calling
35 /// \c adjustToUnmodifiedLine after the call to \c nextLine will cause
36 /// subsequent lines on the same level to be indented at the same level as the
38 class LevelIndentTracker {
40 LevelIndentTracker(const FormatStyle &Style,
41 const AdditionalKeywords &Keywords, unsigned StartLevel,
43 : Style(Style), Keywords(Keywords), AdditionalIndent(AdditionalIndent) {
44 for (unsigned i = 0; i != StartLevel; ++i)
45 IndentForLevel.push_back(Style.IndentWidth * i + AdditionalIndent);
48 /// Returns the indent for the current line.
49 unsigned getIndent() const { return Indent; }
51 /// Update the indent state given that \p Line is going to be formatted
53 void nextLine(const AnnotatedLine &Line) {
54 Offset = getIndentOffset(*Line.First);
55 // Update the indent level cache size so that we can rely on it
56 // having the right size in adjustToUnmodifiedline.
57 while (IndentForLevel.size() <= Line.Level)
58 IndentForLevel.push_back(-1);
59 if (Line.InPPDirective) {
60 Indent = Line.Level * Style.IndentWidth + AdditionalIndent;
62 IndentForLevel.resize(Line.Level + 1);
63 Indent = getIndent(IndentForLevel, Line.Level);
65 if (static_cast<int>(Indent) + Offset >= 0)
69 /// Update the indent state given that \p Line indent should be
71 void skipLine(const AnnotatedLine &Line) {
72 while (IndentForLevel.size() <= Line.Level)
73 IndentForLevel.push_back(Indent);
76 /// Update the level indent to adapt to the given \p Line.
78 /// When a line is not formatted, we move the subsequent lines on the same
79 /// level to the same indent.
80 /// Note that \c nextLine must have been called before this method.
81 void adjustToUnmodifiedLine(const AnnotatedLine &Line) {
82 unsigned LevelIndent = Line.First->OriginalColumn;
83 if (static_cast<int>(LevelIndent) - Offset >= 0)
84 LevelIndent -= Offset;
85 if ((!Line.First->is(tok::comment) || IndentForLevel[Line.Level] == -1) &&
87 IndentForLevel[Line.Level] = LevelIndent;
91 /// Get the offset of the line relatively to the level.
93 /// For example, 'public:' labels in classes are offset by 1 or 2
94 /// characters to the left from their level.
95 int getIndentOffset(const FormatToken &RootToken) {
96 if (Style.Language == FormatStyle::LK_Java ||
97 Style.Language == FormatStyle::LK_JavaScript || Style.isCSharp())
99 if (RootToken.isAccessSpecifier(false) ||
100 RootToken.isObjCAccessSpecifier() ||
101 (RootToken.isOneOf(Keywords.kw_signals, Keywords.kw_qsignals) &&
102 RootToken.Next && RootToken.Next->is(tok::colon)))
103 return Style.AccessModifierOffset;
107 /// Get the indent of \p Level from \p IndentForLevel.
109 /// \p IndentForLevel must contain the indent for the level \c l
110 /// at \p IndentForLevel[l], or a value < 0 if the indent for
111 /// that level is unknown.
112 unsigned getIndent(ArrayRef<int> IndentForLevel, unsigned Level) {
113 if (IndentForLevel[Level] != -1)
114 return IndentForLevel[Level];
117 return getIndent(IndentForLevel, Level - 1) + Style.IndentWidth;
120 const FormatStyle &Style;
121 const AdditionalKeywords &Keywords;
122 const unsigned AdditionalIndent;
124 /// The indent in characters for each level.
125 std::vector<int> IndentForLevel;
127 /// Offset of the current line relative to the indent level.
129 /// For example, the 'public' keywords is often indented with a negative
133 /// The current line's indent.
137 const FormatToken *getMatchingNamespaceToken(
138 const AnnotatedLine *Line,
139 const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines) {
140 if (!Line->startsWith(tok::r_brace))
142 size_t StartLineIndex = Line->MatchingOpeningBlockLineIndex;
143 if (StartLineIndex == UnwrappedLine::kInvalidIndex)
145 assert(StartLineIndex < AnnotatedLines.size());
146 return AnnotatedLines[StartLineIndex]->First->getNamespaceToken();
149 StringRef getNamespaceTokenText(const AnnotatedLine *Line) {
150 const FormatToken *NamespaceToken = Line->First->getNamespaceToken();
151 return NamespaceToken ? NamespaceToken->TokenText : StringRef();
154 StringRef getMatchingNamespaceTokenText(
155 const AnnotatedLine *Line,
156 const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines) {
157 const FormatToken *NamespaceToken =
158 getMatchingNamespaceToken(Line, AnnotatedLines);
159 return NamespaceToken ? NamespaceToken->TokenText : StringRef();
164 LineJoiner(const FormatStyle &Style, const AdditionalKeywords &Keywords,
165 const SmallVectorImpl<AnnotatedLine *> &Lines)
166 : Style(Style), Keywords(Keywords), End(Lines.end()), Next(Lines.begin()),
167 AnnotatedLines(Lines) {}
169 /// Returns the next line, merging multiple lines into one if possible.
170 const AnnotatedLine *getNextMergedLine(bool DryRun,
171 LevelIndentTracker &IndentTracker) {
174 const AnnotatedLine *Current = *Next;
175 IndentTracker.nextLine(*Current);
176 unsigned MergedLines = tryFitMultipleLinesInOne(IndentTracker, Next, End);
177 if (MergedLines > 0 && Style.ColumnLimit == 0)
178 // Disallow line merging if there is a break at the start of one of the
180 for (unsigned i = 0; i < MergedLines; ++i)
181 if (Next[i + 1]->First->NewlinesBefore > 0)
184 for (unsigned i = 0; i < MergedLines; ++i)
185 join(*Next[0], *Next[i + 1]);
186 Next = Next + MergedLines + 1;
191 /// Calculates how many lines can be merged into 1 starting at \p I.
193 tryFitMultipleLinesInOne(LevelIndentTracker &IndentTracker,
194 SmallVectorImpl<AnnotatedLine *>::const_iterator I,
195 SmallVectorImpl<AnnotatedLine *>::const_iterator E) {
196 const unsigned Indent = IndentTracker.getIndent();
198 // Can't join the last line with anything.
201 // We can never merge stuff if there are trailing line comments.
202 const AnnotatedLine *TheLine = *I;
203 if (TheLine->Last->is(TT_LineComment))
205 if (I[1]->Type == LT_Invalid || I[1]->First->MustBreakBefore)
207 if (TheLine->InPPDirective &&
208 (!I[1]->InPPDirective || I[1]->First->HasUnescapedNewline))
211 if (Style.ColumnLimit > 0 && Indent > Style.ColumnLimit)
215 Style.ColumnLimit == 0 ? UINT_MAX : Style.ColumnLimit - Indent;
216 // If we already exceed the column limit, we set 'Limit' to 0. The different
217 // tryMerge..() functions can then decide whether to still do merging.
218 Limit = TheLine->Last->TotalLength > Limit
220 : Limit - TheLine->Last->TotalLength;
222 if (TheLine->Last->is(TT_FunctionLBrace) &&
223 TheLine->First == TheLine->Last &&
224 !Style.BraceWrapping.SplitEmptyFunction &&
225 I[1]->First->is(tok::r_brace))
226 return tryMergeSimpleBlock(I, E, Limit);
228 // Handle empty record blocks where the brace has already been wrapped
229 if (TheLine->Last->is(tok::l_brace) && TheLine->First == TheLine->Last &&
230 I != AnnotatedLines.begin()) {
231 bool EmptyBlock = I[1]->First->is(tok::r_brace);
233 const FormatToken *Tok = I[-1]->First;
234 if (Tok && Tok->is(tok::comment))
235 Tok = Tok->getNextNonComment();
237 if (Tok && Tok->getNamespaceToken())
238 return !Style.BraceWrapping.SplitEmptyNamespace && EmptyBlock
239 ? tryMergeSimpleBlock(I, E, Limit)
242 if (Tok && Tok->is(tok::kw_typedef))
243 Tok = Tok->getNextNonComment();
244 if (Tok && Tok->isOneOf(tok::kw_class, tok::kw_struct, tok::kw_union,
245 tok::kw_extern, Keywords.kw_interface))
246 return !Style.BraceWrapping.SplitEmptyRecord && EmptyBlock
247 ? tryMergeSimpleBlock(I, E, Limit)
251 // FIXME: TheLine->Level != 0 might or might not be the right check to do.
252 // If necessary, change to something smarter.
253 bool MergeShortFunctions =
254 Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_All ||
255 (Style.AllowShortFunctionsOnASingleLine >= FormatStyle::SFS_Empty &&
256 I[1]->First->is(tok::r_brace)) ||
257 (Style.AllowShortFunctionsOnASingleLine & FormatStyle::SFS_InlineOnly &&
258 TheLine->Level != 0);
260 if (Style.CompactNamespaces) {
261 if (auto nsToken = TheLine->First->getNamespaceToken()) {
263 unsigned closingLine = TheLine->MatchingClosingBlockLineIndex - 1;
264 for (; I + 1 + i != E &&
265 nsToken->TokenText == getNamespaceTokenText(I[i + 1]) &&
266 closingLine == I[i + 1]->MatchingClosingBlockLineIndex &&
267 I[i + 1]->Last->TotalLength < Limit;
268 i++, closingLine--) {
269 // No extra indent for compacted namespaces
270 IndentTracker.skipLine(*I[i + 1]);
272 Limit -= I[i + 1]->Last->TotalLength;
277 if (auto nsToken = getMatchingNamespaceToken(TheLine, AnnotatedLines)) {
279 unsigned openingLine = TheLine->MatchingOpeningBlockLineIndex - 1;
280 for (; I + 1 + i != E &&
281 nsToken->TokenText ==
282 getMatchingNamespaceTokenText(I[i + 1], AnnotatedLines) &&
283 openingLine == I[i + 1]->MatchingOpeningBlockLineIndex;
284 i++, openingLine--) {
285 // No space between consecutive braces
286 I[i + 1]->First->SpacesRequiredBefore = !I[i]->Last->is(tok::r_brace);
288 // Indent like the outer-most namespace
289 IndentTracker.nextLine(*I[i + 1]);
295 // Try to merge a function block with left brace unwrapped
296 if (TheLine->Last->is(TT_FunctionLBrace) &&
297 TheLine->First != TheLine->Last) {
298 return MergeShortFunctions ? tryMergeSimpleBlock(I, E, Limit) : 0;
300 // Try to merge a control statement block with left brace unwrapped
301 if (TheLine->Last->is(tok::l_brace) && TheLine->First != TheLine->Last &&
302 TheLine->First->isOneOf(tok::kw_if, tok::kw_while, tok::kw_for)) {
303 return Style.AllowShortBlocksOnASingleLine != FormatStyle::SBS_Never
304 ? tryMergeSimpleBlock(I, E, Limit)
307 // Try to merge a control statement block with left brace wrapped
308 if (I[1]->First->is(tok::l_brace) &&
309 (TheLine->First->isOneOf(tok::kw_if, tok::kw_while, tok::kw_for,
310 tok::kw_switch, tok::kw_try, tok::kw_do) ||
311 (TheLine->First->is(tok::r_brace) && TheLine->First->Next &&
312 TheLine->First->Next->isOneOf(tok::kw_else, tok::kw_catch))) &&
313 Style.BraceWrapping.AfterControlStatement ==
314 FormatStyle::BWACS_MultiLine) {
315 // If possible, merge the next line's wrapped left brace with the current
316 // line. Otherwise, leave it on the next line, as this is a multi-line
317 // control statement.
318 return (Style.ColumnLimit == 0 ||
319 TheLine->Last->TotalLength <= Style.ColumnLimit)
322 } else if (I[1]->First->is(tok::l_brace) &&
323 TheLine->First->isOneOf(tok::kw_if, tok::kw_while,
325 return (Style.BraceWrapping.AfterControlStatement ==
326 FormatStyle::BWACS_Always)
327 ? tryMergeSimpleBlock(I, E, Limit)
330 // Try to merge either empty or one-line block if is precedeed by control
332 if (TheLine->First->is(tok::l_brace) && TheLine->First == TheLine->Last &&
333 I != AnnotatedLines.begin() &&
334 I[-1]->First->isOneOf(tok::kw_if, tok::kw_while, tok::kw_for)) {
335 unsigned MergedLines = 0;
336 if (Style.AllowShortBlocksOnASingleLine != FormatStyle::SBS_Never) {
337 MergedLines = tryMergeSimpleBlock(I - 1, E, Limit);
338 // If we managed to merge the block, discard the first merged line
339 // since we are merging starting from I.
345 // Don't merge block with left brace wrapped after ObjC special blocks
346 if (TheLine->First->is(tok::l_brace) && I != AnnotatedLines.begin() &&
347 I[-1]->First->is(tok::at) && I[-1]->First->Next) {
348 tok::ObjCKeywordKind kwId = I[-1]->First->Next->Tok.getObjCKeywordID();
349 if (kwId == clang::tok::objc_autoreleasepool ||
350 kwId == clang::tok::objc_synchronized)
353 // Don't merge block with left brace wrapped after case labels
354 if (TheLine->First->is(tok::l_brace) && I != AnnotatedLines.begin() &&
355 I[-1]->First->isOneOf(tok::kw_case, tok::kw_default))
357 // Try to merge a block with left brace wrapped that wasn't yet covered
358 if (TheLine->Last->is(tok::l_brace)) {
359 return !Style.BraceWrapping.AfterFunction ||
360 (I[1]->First->is(tok::r_brace) &&
361 !Style.BraceWrapping.SplitEmptyRecord)
362 ? tryMergeSimpleBlock(I, E, Limit)
365 // Try to merge a function block with left brace wrapped
366 if (I[1]->First->is(TT_FunctionLBrace) &&
367 Style.BraceWrapping.AfterFunction) {
368 if (I[1]->Last->is(TT_LineComment))
371 // Check for Limit <= 2 to account for the " {".
372 if (Limit <= 2 || (Style.ColumnLimit == 0 && containsMustBreak(TheLine)))
376 unsigned MergedLines = 0;
377 if (MergeShortFunctions ||
378 (Style.AllowShortFunctionsOnASingleLine >= FormatStyle::SFS_Empty &&
379 I[1]->First == I[1]->Last && I + 2 != E &&
380 I[2]->First->is(tok::r_brace))) {
381 MergedLines = tryMergeSimpleBlock(I + 1, E, Limit);
382 // If we managed to merge the block, count the function header, which is
383 // on a separate line.
389 if (TheLine->First->is(tok::kw_if)) {
390 return Style.AllowShortIfStatementsOnASingleLine
391 ? tryMergeSimpleControlStatement(I, E, Limit)
394 if (TheLine->First->isOneOf(tok::kw_for, tok::kw_while)) {
395 return Style.AllowShortLoopsOnASingleLine
396 ? tryMergeSimpleControlStatement(I, E, Limit)
399 if (TheLine->First->isOneOf(tok::kw_case, tok::kw_default)) {
400 return Style.AllowShortCaseLabelsOnASingleLine
401 ? tryMergeShortCaseLabels(I, E, Limit)
404 if (TheLine->InPPDirective &&
405 (TheLine->First->HasUnescapedNewline || TheLine->First->IsFirst)) {
406 return tryMergeSimplePPDirective(I, E, Limit);
412 tryMergeSimplePPDirective(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
413 SmallVectorImpl<AnnotatedLine *>::const_iterator E,
417 if (I + 2 != E && I[2]->InPPDirective && !I[2]->First->HasUnescapedNewline)
419 if (1 + I[1]->Last->TotalLength > Limit)
424 unsigned tryMergeSimpleControlStatement(
425 SmallVectorImpl<AnnotatedLine *>::const_iterator I,
426 SmallVectorImpl<AnnotatedLine *>::const_iterator E, unsigned Limit) {
429 if (Style.BraceWrapping.AfterControlStatement ==
430 FormatStyle::BWACS_Always &&
431 I[1]->First->is(tok::l_brace) &&
432 Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Never)
434 if (I[1]->InPPDirective != (*I)->InPPDirective ||
435 (I[1]->InPPDirective && I[1]->First->HasUnescapedNewline))
437 Limit = limitConsideringMacros(I + 1, E, Limit);
438 AnnotatedLine &Line = **I;
439 if (Line.Last->isNot(tok::r_paren))
441 if (1 + I[1]->Last->TotalLength > Limit)
443 if (I[1]->First->isOneOf(tok::semi, tok::kw_if, tok::kw_for, tok::kw_while,
446 // Only inline simple if's (no nested if or else), unless specified
447 if (Style.AllowShortIfStatementsOnASingleLine != FormatStyle::SIS_Always) {
448 if (I + 2 != E && Line.startsWith(tok::kw_if) &&
449 I[2]->First->is(tok::kw_else))
456 tryMergeShortCaseLabels(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
457 SmallVectorImpl<AnnotatedLine *>::const_iterator E,
459 if (Limit == 0 || I + 1 == E ||
460 I[1]->First->isOneOf(tok::kw_case, tok::kw_default))
462 if (I[0]->Last->is(tok::l_brace) || I[1]->First->is(tok::l_brace))
464 unsigned NumStmts = 0;
466 bool EndsWithComment = false;
467 bool InPPDirective = I[0]->InPPDirective;
468 const unsigned Level = I[0]->Level;
469 for (; NumStmts < 3; ++NumStmts) {
470 if (I + 1 + NumStmts == E)
472 const AnnotatedLine *Line = I[1 + NumStmts];
473 if (Line->InPPDirective != InPPDirective)
475 if (Line->First->isOneOf(tok::kw_case, tok::kw_default, tok::r_brace))
477 if (Line->First->isOneOf(tok::kw_if, tok::kw_for, tok::kw_switch,
481 if (Line->First->is(tok::comment)) {
482 if (Level != Line->Level)
484 SmallVectorImpl<AnnotatedLine *>::const_iterator J = I + 2 + NumStmts;
485 for (; J != E; ++J) {
487 if (Line->InPPDirective != InPPDirective)
489 if (Line->First->isOneOf(tok::kw_case, tok::kw_default, tok::r_brace))
491 if (Line->First->isNot(tok::comment) || Level != Line->Level)
496 if (Line->Last->is(tok::comment))
497 EndsWithComment = true;
498 Length += I[1 + NumStmts]->Last->TotalLength + 1; // 1 for the space.
500 if (NumStmts == 0 || NumStmts == 3 || Length > Limit)
506 tryMergeSimpleBlock(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
507 SmallVectorImpl<AnnotatedLine *>::const_iterator E,
509 AnnotatedLine &Line = **I;
511 // Don't merge ObjC @ keywords and methods.
512 // FIXME: If an option to allow short exception handling clauses on a single
513 // line is added, change this to not return for @try and friends.
514 if (Style.Language != FormatStyle::LK_Java &&
515 Line.First->isOneOf(tok::at, tok::minus, tok::plus))
518 // Check that the current line allows merging. This depends on whether we
519 // are in a control flow statements as well as several style flags.
520 if (Line.First->isOneOf(tok::kw_else, tok::kw_case) ||
521 (Line.First->Next && Line.First->Next->is(tok::kw_else)))
523 // default: in switch statement
524 if (Line.First->is(tok::kw_default)) {
525 const FormatToken *Tok = Line.First->getNextNonComment();
526 if (Tok && Tok->is(tok::colon))
529 if (Line.First->isOneOf(tok::kw_if, tok::kw_while, tok::kw_do, tok::kw_try,
530 tok::kw___try, tok::kw_catch, tok::kw___finally,
531 tok::kw_for, tok::r_brace, Keywords.kw___except)) {
532 if (Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Never)
534 // Don't merge when we can't except the case when
535 // the control statement block is empty
536 if (!Style.AllowShortIfStatementsOnASingleLine &&
537 Line.startsWith(tok::kw_if) &&
538 !Style.BraceWrapping.AfterControlStatement &&
539 !I[1]->First->is(tok::r_brace))
541 if (!Style.AllowShortIfStatementsOnASingleLine &&
542 Line.startsWith(tok::kw_if) &&
543 Style.BraceWrapping.AfterControlStatement ==
544 FormatStyle::BWACS_Always &&
545 I + 2 != E && !I[2]->First->is(tok::r_brace))
547 if (!Style.AllowShortLoopsOnASingleLine &&
548 Line.First->isOneOf(tok::kw_while, tok::kw_do, tok::kw_for) &&
549 !Style.BraceWrapping.AfterControlStatement &&
550 !I[1]->First->is(tok::r_brace))
552 if (!Style.AllowShortLoopsOnASingleLine &&
553 Line.First->isOneOf(tok::kw_while, tok::kw_do, tok::kw_for) &&
554 Style.BraceWrapping.AfterControlStatement ==
555 FormatStyle::BWACS_Always &&
556 I + 2 != E && !I[2]->First->is(tok::r_brace))
558 // FIXME: Consider an option to allow short exception handling clauses on
560 // FIXME: This isn't covered by tests.
561 // FIXME: For catch, __except, __finally the first token on the line
562 // is '}', so this isn't correct here.
563 if (Line.First->isOneOf(tok::kw_try, tok::kw___try, tok::kw_catch,
564 Keywords.kw___except, tok::kw___finally))
568 if (Line.Last->is(tok::l_brace)) {
569 FormatToken *Tok = I[1]->First;
570 if (Tok->is(tok::r_brace) && !Tok->MustBreakBefore &&
571 (Tok->getNextNonComment() == nullptr ||
572 Tok->getNextNonComment()->is(tok::semi))) {
573 // We merge empty blocks even if the line exceeds the column limit.
574 Tok->SpacesRequiredBefore = Style.SpaceInEmptyBlock ? 1 : 0;
575 Tok->CanBreakBefore = true;
577 } else if (Limit != 0 && !Line.startsWithNamespace() &&
578 !startsExternCBlock(Line)) {
579 // We don't merge short records.
580 FormatToken *RecordTok = Line.First;
581 // Skip record modifiers.
582 while (RecordTok->Next &&
583 RecordTok->isOneOf(tok::kw_typedef, tok::kw_export,
584 Keywords.kw_declare, Keywords.kw_abstract,
586 RecordTok = RecordTok->Next;
588 RecordTok->isOneOf(tok::kw_class, tok::kw_union, tok::kw_struct,
589 Keywords.kw_interface))
592 // Check that we still have three lines and they fit into the limit.
593 if (I + 2 == E || I[2]->Type == LT_Invalid)
595 Limit = limitConsideringMacros(I + 2, E, Limit);
597 if (!nextTwoLinesFitInto(I, Limit))
600 // Second, check that the next line does not contain any braces - if it
601 // does, readability declines when putting it into a single line.
602 if (I[1]->Last->is(TT_LineComment))
605 if (Tok->is(tok::l_brace) && Tok->BlockKind != BK_BracedInit)
610 // Last, check that the third line starts with a closing brace.
612 if (Tok->isNot(tok::r_brace))
615 // Don't merge "if (a) { .. } else {".
616 if (Tok->Next && Tok->Next->is(tok::kw_else))
619 // Don't merge a trailing multi-line control statement block like:
622 // { <-- current Line
625 if (Line.First == Line.Last &&
626 Style.BraceWrapping.AfterControlStatement ==
627 FormatStyle::BWACS_MultiLine)
632 } else if (I[1]->First->is(tok::l_brace)) {
633 if (I[1]->Last->is(TT_LineComment))
636 // Check for Limit <= 2 to account for the " {".
637 if (Limit <= 2 || (Style.ColumnLimit == 0 && containsMustBreak(*I)))
640 unsigned MergedLines = 0;
641 if (Style.AllowShortBlocksOnASingleLine != FormatStyle::SBS_Never ||
642 (I[1]->First == I[1]->Last && I + 2 != E &&
643 I[2]->First->is(tok::r_brace))) {
644 MergedLines = tryMergeSimpleBlock(I + 1, E, Limit);
645 // If we managed to merge the block, count the statement header, which
646 // is on a separate line.
655 /// Returns the modified column limit for \p I if it is inside a macro and
656 /// needs a trailing '\'.
658 limitConsideringMacros(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
659 SmallVectorImpl<AnnotatedLine *>::const_iterator E,
661 if (I[0]->InPPDirective && I + 1 != E &&
662 !I[1]->First->HasUnescapedNewline && !I[1]->First->is(tok::eof)) {
663 return Limit < 2 ? 0 : Limit - 2;
668 bool nextTwoLinesFitInto(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
670 if (I[1]->First->MustBreakBefore || I[2]->First->MustBreakBefore)
672 return 1 + I[1]->Last->TotalLength + 1 + I[2]->Last->TotalLength <= Limit;
675 bool containsMustBreak(const AnnotatedLine *Line) {
676 for (const FormatToken *Tok = Line->First; Tok; Tok = Tok->Next) {
677 if (Tok->MustBreakBefore)
683 void join(AnnotatedLine &A, const AnnotatedLine &B) {
684 assert(!A.Last->Next);
685 assert(!B.First->Previous);
688 A.Last->Next = B.First;
689 B.First->Previous = A.Last;
690 B.First->CanBreakBefore = true;
691 unsigned LengthA = A.Last->TotalLength + B.First->SpacesRequiredBefore;
692 for (FormatToken *Tok = B.First; Tok; Tok = Tok->Next) {
693 Tok->TotalLength += LengthA;
698 const FormatStyle &Style;
699 const AdditionalKeywords &Keywords;
700 const SmallVectorImpl<AnnotatedLine *>::const_iterator End;
702 SmallVectorImpl<AnnotatedLine *>::const_iterator Next;
703 const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines;
706 static void markFinalized(FormatToken *Tok) {
707 for (; Tok; Tok = Tok->Next) {
708 Tok->Finalized = true;
709 for (AnnotatedLine *Child : Tok->Children)
710 markFinalized(Child->First);
715 static void printLineState(const LineState &State) {
716 llvm::dbgs() << "State: ";
717 for (const ParenState &P : State.Stack) {
718 llvm::dbgs() << (P.Tok ? P.Tok->TokenText : "F") << "|" << P.Indent << "|"
719 << P.LastSpace << "|" << P.NestedBlockIndent << " ";
721 llvm::dbgs() << State.NextToken->TokenText << "\n";
725 /// Base class for classes that format one \c AnnotatedLine.
726 class LineFormatter {
728 LineFormatter(ContinuationIndenter *Indenter, WhitespaceManager *Whitespaces,
729 const FormatStyle &Style,
730 UnwrappedLineFormatter *BlockFormatter)
731 : Indenter(Indenter), Whitespaces(Whitespaces), Style(Style),
732 BlockFormatter(BlockFormatter) {}
733 virtual ~LineFormatter() {}
735 /// Formats an \c AnnotatedLine and returns the penalty.
737 /// If \p DryRun is \c false, directly applies the changes.
738 virtual unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
739 unsigned FirstStartColumn, bool DryRun) = 0;
742 /// If the \p State's next token is an r_brace closing a nested block,
743 /// format the nested block before it.
745 /// Returns \c true if all children could be placed successfully and adapts
746 /// \p Penalty as well as \p State. If \p DryRun is false, also directly
747 /// creates changes using \c Whitespaces.
749 /// The crucial idea here is that children always get formatted upon
750 /// encountering the closing brace right after the nested block. Now, if we
751 /// are currently trying to keep the "}" on the same line (i.e. \p NewLine is
752 /// \c false), the entire block has to be kept on the same line (which is only
753 /// possible if it fits on the line, only contains a single statement, etc.
755 /// If \p NewLine is true, we format the nested block on separate lines, i.e.
756 /// break after the "{", format all lines with correct indentation and the put
757 /// the closing "}" on yet another new line.
759 /// This enables us to keep the simple structure of the
760 /// \c UnwrappedLineFormatter, where we only have two options for each token:
761 /// break or don't break.
762 bool formatChildren(LineState &State, bool NewLine, bool DryRun,
764 const FormatToken *LBrace = State.NextToken->getPreviousNonComment();
765 FormatToken &Previous = *State.NextToken->Previous;
766 if (!LBrace || LBrace->isNot(tok::l_brace) ||
767 LBrace->BlockKind != BK_Block || Previous.Children.size() == 0)
768 // The previous token does not open a block. Nothing to do. We don't
769 // assert so that we can simply call this function for all tokens.
773 int AdditionalIndent = State.Stack.back().Indent -
774 Previous.Children[0]->Level * Style.IndentWidth;
777 BlockFormatter->format(Previous.Children, DryRun, AdditionalIndent,
778 /*FixBadIndentation=*/true);
782 if (Previous.Children[0]->First->MustBreakBefore)
785 // Cannot merge into one line if this line ends on a comment.
786 if (Previous.is(tok::comment))
789 // Cannot merge multiple statements into a single line.
790 if (Previous.Children.size() > 1)
793 const AnnotatedLine *Child = Previous.Children[0];
794 // We can't put the closing "}" on a line with a trailing comment.
795 if (Child->Last->isTrailingComment())
798 // If the child line exceeds the column limit, we wouldn't want to merge it.
799 // We add +2 for the trailing " }".
800 if (Style.ColumnLimit > 0 &&
801 Child->Last->TotalLength + State.Column + 2 > Style.ColumnLimit)
805 Whitespaces->replaceWhitespace(
806 *Child->First, /*Newlines=*/0, /*Spaces=*/1,
807 /*StartOfTokenColumn=*/State.Column, State.Line->InPPDirective);
810 formatLine(*Child, State.Column + 1, /*FirstStartColumn=*/0, DryRun);
812 State.Column += 1 + Child->Last->TotalLength;
816 ContinuationIndenter *Indenter;
819 WhitespaceManager *Whitespaces;
820 const FormatStyle &Style;
821 UnwrappedLineFormatter *BlockFormatter;
824 /// Formatter that keeps the existing line breaks.
825 class NoColumnLimitLineFormatter : public LineFormatter {
827 NoColumnLimitLineFormatter(ContinuationIndenter *Indenter,
828 WhitespaceManager *Whitespaces,
829 const FormatStyle &Style,
830 UnwrappedLineFormatter *BlockFormatter)
831 : LineFormatter(Indenter, Whitespaces, Style, BlockFormatter) {}
833 /// Formats the line, simply keeping all of the input's line breaking
835 unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
836 unsigned FirstStartColumn, bool DryRun) override {
838 LineState State = Indenter->getInitialState(FirstIndent, FirstStartColumn,
839 &Line, /*DryRun=*/false);
840 while (State.NextToken) {
842 Indenter->mustBreak(State) ||
843 (Indenter->canBreak(State) && State.NextToken->NewlinesBefore > 0);
844 unsigned Penalty = 0;
845 formatChildren(State, Newline, /*DryRun=*/false, Penalty);
846 Indenter->addTokenToState(State, Newline, /*DryRun=*/false);
852 /// Formatter that puts all tokens into a single line without breaks.
853 class NoLineBreakFormatter : public LineFormatter {
855 NoLineBreakFormatter(ContinuationIndenter *Indenter,
856 WhitespaceManager *Whitespaces, const FormatStyle &Style,
857 UnwrappedLineFormatter *BlockFormatter)
858 : LineFormatter(Indenter, Whitespaces, Style, BlockFormatter) {}
860 /// Puts all tokens into a single line.
861 unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
862 unsigned FirstStartColumn, bool DryRun) override {
863 unsigned Penalty = 0;
865 Indenter->getInitialState(FirstIndent, FirstStartColumn, &Line, DryRun);
866 while (State.NextToken) {
867 formatChildren(State, /*NewLine=*/false, DryRun, Penalty);
868 Indenter->addTokenToState(
869 State, /*Newline=*/State.NextToken->MustBreakBefore, DryRun);
875 /// Finds the best way to break lines.
876 class OptimizingLineFormatter : public LineFormatter {
878 OptimizingLineFormatter(ContinuationIndenter *Indenter,
879 WhitespaceManager *Whitespaces,
880 const FormatStyle &Style,
881 UnwrappedLineFormatter *BlockFormatter)
882 : LineFormatter(Indenter, Whitespaces, Style, BlockFormatter) {}
884 /// Formats the line by finding the best line breaks with line lengths
885 /// below the column limit.
886 unsigned formatLine(const AnnotatedLine &Line, unsigned FirstIndent,
887 unsigned FirstStartColumn, bool DryRun) override {
889 Indenter->getInitialState(FirstIndent, FirstStartColumn, &Line, DryRun);
891 // If the ObjC method declaration does not fit on a line, we should format
892 // it with one arg per line.
893 if (State.Line->Type == LT_ObjCMethodDecl)
894 State.Stack.back().BreakBeforeParameter = true;
896 // Find best solution in solution space.
897 return analyzeSolutionSpace(State, DryRun);
901 struct CompareLineStatePointers {
902 bool operator()(LineState *obj1, LineState *obj2) const {
903 return *obj1 < *obj2;
907 /// A pair of <penalty, count> that is used to prioritize the BFS on.
909 /// In case of equal penalties, we want to prefer states that were inserted
910 /// first. During state generation we make sure that we insert states first
911 /// that break the line as late as possible.
912 typedef std::pair<unsigned, unsigned> OrderedPenalty;
914 /// An edge in the solution space from \c Previous->State to \c State,
915 /// inserting a newline dependent on the \c NewLine.
917 StateNode(const LineState &State, bool NewLine, StateNode *Previous)
918 : State(State), NewLine(NewLine), Previous(Previous) {}
924 /// An item in the prioritized BFS search queue. The \c StateNode's
925 /// \c State has the given \c OrderedPenalty.
926 typedef std::pair<OrderedPenalty, StateNode *> QueueItem;
928 /// The BFS queue type.
929 typedef std::priority_queue<QueueItem, std::vector<QueueItem>,
930 std::greater<QueueItem>>
933 /// Analyze the entire solution space starting from \p InitialState.
935 /// This implements a variant of Dijkstra's algorithm on the graph that spans
936 /// the solution space (\c LineStates are the nodes). The algorithm tries to
937 /// find the shortest path (the one with lowest penalty) from \p InitialState
938 /// to a state where all tokens are placed. Returns the penalty.
940 /// If \p DryRun is \c false, directly applies the changes.
941 unsigned analyzeSolutionSpace(LineState &InitialState, bool DryRun) {
942 std::set<LineState *, CompareLineStatePointers> Seen;
944 // Increasing count of \c StateNode items we have created. This is used to
945 // create a deterministic order independent of the container.
949 // Insert start element into queue.
951 new (Allocator.Allocate()) StateNode(InitialState, false, nullptr);
952 Queue.push(QueueItem(OrderedPenalty(0, Count), Node));
955 unsigned Penalty = 0;
957 // While not empty, take first element and follow edges.
958 while (!Queue.empty()) {
959 Penalty = Queue.top().first.first;
960 StateNode *Node = Queue.top().second;
961 if (!Node->State.NextToken) {
962 LLVM_DEBUG(llvm::dbgs()
963 << "\n---\nPenalty for line: " << Penalty << "\n");
968 // Cut off the analysis of certain solutions if the analysis gets too
969 // complex. See description of IgnoreStackForComparison.
971 Node->State.IgnoreStackForComparison = true;
973 if (!Seen.insert(&Node->State).second)
974 // State already examined with lower penalty.
977 FormatDecision LastFormat = Node->State.NextToken->Decision;
978 if (LastFormat == FD_Unformatted || LastFormat == FD_Continue)
979 addNextStateToQueue(Penalty, Node, /*NewLine=*/false, &Count, &Queue);
980 if (LastFormat == FD_Unformatted || LastFormat == FD_Break)
981 addNextStateToQueue(Penalty, Node, /*NewLine=*/true, &Count, &Queue);
985 // We were unable to find a solution, do nothing.
986 // FIXME: Add diagnostic?
987 LLVM_DEBUG(llvm::dbgs() << "Could not find a solution.\n");
991 // Reconstruct the solution.
993 reconstructPath(InitialState, Queue.top().second);
995 LLVM_DEBUG(llvm::dbgs()
996 << "Total number of analyzed states: " << Count << "\n");
997 LLVM_DEBUG(llvm::dbgs() << "---\n");
1002 /// Add the following state to the analysis queue \c Queue.
1004 /// Assume the current state is \p PreviousNode and has been reached with a
1005 /// penalty of \p Penalty. Insert a line break if \p NewLine is \c true.
1006 void addNextStateToQueue(unsigned Penalty, StateNode *PreviousNode,
1007 bool NewLine, unsigned *Count, QueueType *Queue) {
1008 if (NewLine && !Indenter->canBreak(PreviousNode->State))
1010 if (!NewLine && Indenter->mustBreak(PreviousNode->State))
1013 StateNode *Node = new (Allocator.Allocate())
1014 StateNode(PreviousNode->State, NewLine, PreviousNode);
1015 if (!formatChildren(Node->State, NewLine, /*DryRun=*/true, Penalty))
1018 Penalty += Indenter->addTokenToState(Node->State, NewLine, true);
1020 Queue->push(QueueItem(OrderedPenalty(Penalty, *Count), Node));
1024 /// Applies the best formatting by reconstructing the path in the
1025 /// solution space that leads to \c Best.
1026 void reconstructPath(LineState &State, StateNode *Best) {
1027 std::deque<StateNode *> Path;
1028 // We do not need a break before the initial token.
1029 while (Best->Previous) {
1030 Path.push_front(Best);
1031 Best = Best->Previous;
1033 for (auto I = Path.begin(), E = Path.end(); I != E; ++I) {
1034 unsigned Penalty = 0;
1035 formatChildren(State, (*I)->NewLine, /*DryRun=*/false, Penalty);
1036 Penalty += Indenter->addTokenToState(State, (*I)->NewLine, false);
1039 printLineState((*I)->Previous->State);
1040 if ((*I)->NewLine) {
1041 llvm::dbgs() << "Penalty for placing "
1042 << (*I)->Previous->State.NextToken->Tok.getName()
1043 << " on a new line: " << Penalty << "\n";
1049 llvm::SpecificBumpPtrAllocator<StateNode> Allocator;
1052 } // anonymous namespace
1054 unsigned UnwrappedLineFormatter::format(
1055 const SmallVectorImpl<AnnotatedLine *> &Lines, bool DryRun,
1056 int AdditionalIndent, bool FixBadIndentation, unsigned FirstStartColumn,
1057 unsigned NextStartColumn, unsigned LastStartColumn) {
1058 LineJoiner Joiner(Style, Keywords, Lines);
1060 // Try to look up already computed penalty in DryRun-mode.
1061 std::pair<const SmallVectorImpl<AnnotatedLine *> *, unsigned> CacheKey(
1062 &Lines, AdditionalIndent);
1063 auto CacheIt = PenaltyCache.find(CacheKey);
1064 if (DryRun && CacheIt != PenaltyCache.end())
1065 return CacheIt->second;
1067 assert(!Lines.empty());
1068 unsigned Penalty = 0;
1069 LevelIndentTracker IndentTracker(Style, Keywords, Lines[0]->Level,
1071 const AnnotatedLine *PreviousLine = nullptr;
1072 const AnnotatedLine *NextLine = nullptr;
1074 // The minimum level of consecutive lines that have been formatted.
1075 unsigned RangeMinLevel = UINT_MAX;
1077 bool FirstLine = true;
1078 for (const AnnotatedLine *Line =
1079 Joiner.getNextMergedLine(DryRun, IndentTracker);
1080 Line; Line = NextLine, FirstLine = false) {
1081 const AnnotatedLine &TheLine = *Line;
1082 unsigned Indent = IndentTracker.getIndent();
1084 // We continue formatting unchanged lines to adjust their indent, e.g. if a
1085 // scope was added. However, we need to carefully stop doing this when we
1086 // exit the scope of affected lines to prevent indenting a the entire
1087 // remaining file if it currently missing a closing brace.
1088 bool PreviousRBrace =
1089 PreviousLine && PreviousLine->startsWith(tok::r_brace);
1090 bool ContinueFormatting =
1091 TheLine.Level > RangeMinLevel ||
1092 (TheLine.Level == RangeMinLevel && !PreviousRBrace &&
1093 !TheLine.startsWith(tok::r_brace));
1095 bool FixIndentation = (FixBadIndentation || ContinueFormatting) &&
1096 Indent != TheLine.First->OriginalColumn;
1097 bool ShouldFormat = TheLine.Affected || FixIndentation;
1098 // We cannot format this line; if the reason is that the line had a
1099 // parsing error, remember that.
1100 if (ShouldFormat && TheLine.Type == LT_Invalid && Status) {
1101 Status->FormatComplete = false;
1103 SourceMgr.getSpellingLineNumber(TheLine.First->Tok.getLocation());
1106 if (ShouldFormat && TheLine.Type != LT_Invalid) {
1108 bool LastLine = Line->First->is(tok::eof);
1109 formatFirstToken(TheLine, PreviousLine, Lines, Indent,
1110 LastLine ? LastStartColumn : NextStartColumn + Indent);
1113 NextLine = Joiner.getNextMergedLine(DryRun, IndentTracker);
1114 unsigned ColumnLimit = getColumnLimit(TheLine.InPPDirective, NextLine);
1115 bool FitsIntoOneLine =
1116 TheLine.Last->TotalLength + Indent <= ColumnLimit ||
1117 (TheLine.Type == LT_ImportStatement &&
1118 (Style.Language != FormatStyle::LK_JavaScript ||
1119 !Style.JavaScriptWrapImports)) ||
1120 (Style.isCSharp() &&
1121 TheLine.InPPDirective); // don't split #regions in C#
1122 if (Style.ColumnLimit == 0)
1123 NoColumnLimitLineFormatter(Indenter, Whitespaces, Style, this)
1124 .formatLine(TheLine, NextStartColumn + Indent,
1125 FirstLine ? FirstStartColumn : 0, DryRun);
1126 else if (FitsIntoOneLine)
1127 Penalty += NoLineBreakFormatter(Indenter, Whitespaces, Style, this)
1128 .formatLine(TheLine, NextStartColumn + Indent,
1129 FirstLine ? FirstStartColumn : 0, DryRun);
1131 Penalty += OptimizingLineFormatter(Indenter, Whitespaces, Style, this)
1132 .formatLine(TheLine, NextStartColumn + Indent,
1133 FirstLine ? FirstStartColumn : 0, DryRun);
1134 RangeMinLevel = std::min(RangeMinLevel, TheLine.Level);
1136 // If no token in the current line is affected, we still need to format
1137 // affected children.
1138 if (TheLine.ChildrenAffected)
1139 for (const FormatToken *Tok = TheLine.First; Tok; Tok = Tok->Next)
1140 if (!Tok->Children.empty())
1141 format(Tok->Children, DryRun);
1143 // Adapt following lines on the current indent level to the same level
1144 // unless the current \c AnnotatedLine is not at the beginning of a line.
1145 bool StartsNewLine =
1146 TheLine.First->NewlinesBefore > 0 || TheLine.First->IsFirst;
1148 IndentTracker.adjustToUnmodifiedLine(TheLine);
1150 bool ReformatLeadingWhitespace =
1151 StartsNewLine && ((PreviousLine && PreviousLine->Affected) ||
1152 TheLine.LeadingEmptyLinesAffected);
1153 // Format the first token.
1154 if (ReformatLeadingWhitespace)
1155 formatFirstToken(TheLine, PreviousLine, Lines,
1156 TheLine.First->OriginalColumn,
1157 TheLine.First->OriginalColumn);
1159 Whitespaces->addUntouchableToken(*TheLine.First,
1160 TheLine.InPPDirective);
1162 // Notify the WhitespaceManager about the unchanged whitespace.
1163 for (FormatToken *Tok = TheLine.First->Next; Tok; Tok = Tok->Next)
1164 Whitespaces->addUntouchableToken(*Tok, TheLine.InPPDirective);
1166 NextLine = Joiner.getNextMergedLine(DryRun, IndentTracker);
1167 RangeMinLevel = UINT_MAX;
1170 markFinalized(TheLine.First);
1171 PreviousLine = &TheLine;
1173 PenaltyCache[CacheKey] = Penalty;
1177 void UnwrappedLineFormatter::formatFirstToken(
1178 const AnnotatedLine &Line, const AnnotatedLine *PreviousLine,
1179 const SmallVectorImpl<AnnotatedLine *> &Lines, unsigned Indent,
1180 unsigned NewlineIndent) {
1181 FormatToken &RootToken = *Line.First;
1182 if (RootToken.is(tok::eof)) {
1183 unsigned Newlines = std::min(RootToken.NewlinesBefore, 1u);
1184 unsigned TokenIndent = Newlines ? NewlineIndent : 0;
1185 Whitespaces->replaceWhitespace(RootToken, Newlines, TokenIndent,
1190 std::min(RootToken.NewlinesBefore, Style.MaxEmptyLinesToKeep + 1);
1191 // Remove empty lines before "}" where applicable.
1192 if (RootToken.is(tok::r_brace) &&
1194 (RootToken.Next->is(tok::semi) && !RootToken.Next->Next)) &&
1195 // Do not remove empty lines before namespace closing "}".
1196 !getNamespaceToken(&Line, Lines))
1197 Newlines = std::min(Newlines, 1u);
1198 // Remove empty lines at the start of nested blocks (lambdas/arrow functions)
1199 if (PreviousLine == nullptr && Line.Level > 0)
1200 Newlines = std::min(Newlines, 1u);
1201 if (Newlines == 0 && !RootToken.IsFirst)
1203 if (RootToken.IsFirst && !RootToken.HasUnescapedNewline)
1206 // Remove empty lines after "{".
1207 if (!Style.KeepEmptyLinesAtTheStartOfBlocks && PreviousLine &&
1208 PreviousLine->Last->is(tok::l_brace) &&
1209 !PreviousLine->startsWithNamespace() &&
1210 !startsExternCBlock(*PreviousLine))
1213 // Insert extra new line before access specifiers.
1214 if (PreviousLine && PreviousLine->Last->isOneOf(tok::semi, tok::r_brace) &&
1215 RootToken.isAccessSpecifier() && RootToken.NewlinesBefore == 1)
1218 // Remove empty lines after access specifiers.
1219 if (PreviousLine && PreviousLine->First->isAccessSpecifier() &&
1220 (!PreviousLine->InPPDirective || !RootToken.HasUnescapedNewline))
1221 Newlines = std::min(1u, Newlines);
1224 Indent = NewlineIndent;
1226 // If in Whitemsmiths mode, indent start and end of blocks
1227 if (Style.BreakBeforeBraces == FormatStyle::BS_Whitesmiths) {
1228 if (RootToken.isOneOf(tok::l_brace, tok::r_brace, tok::kw_case))
1229 Indent += Style.IndentWidth;
1232 // Preprocessor directives get indented before the hash only if specified
1233 if (Style.IndentPPDirectives != FormatStyle::PPDIS_BeforeHash &&
1234 (Line.Type == LT_PreprocessorDirective ||
1235 Line.Type == LT_ImportStatement))
1238 Whitespaces->replaceWhitespace(RootToken, Newlines, Indent, Indent,
1239 Line.InPPDirective &&
1240 !RootToken.HasUnescapedNewline);
1244 UnwrappedLineFormatter::getColumnLimit(bool InPPDirective,
1245 const AnnotatedLine *NextLine) const {
1246 // In preprocessor directives reserve two chars for trailing " \" if the
1247 // next line continues the preprocessor directive.
1248 bool ContinuesPPDirective =
1250 // If there is no next line, this is likely a child line and the parent
1251 // continues the preprocessor directive.
1253 (NextLine->InPPDirective &&
1254 // If there is an unescaped newline between this line and the next, the
1255 // next line starts a new preprocessor directive.
1256 !NextLine->First->HasUnescapedNewline));
1257 return Style.ColumnLimit - (ContinuesPPDirective ? 2 : 0);
1260 } // namespace format
1261 } // namespace clang