1 //===--- BreakableToken.cpp - Format C++ code -----------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// Contains implementation of BreakableToken class and classes derived
11 /// from it.
12 ///
13 //===----------------------------------------------------------------------===//
14
15 #include "BreakableToken.h"
16 #include "ContinuationIndenter.h"
17 #include "clang/Basic/CharInfo.h"
18 #include "clang/Format/Format.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/Support/Debug.h"
21 #include <algorithm>
22
23 #define DEBUG_TYPE "format-token-breaker"
24
25 namespace clang {
26 namespace format {
27
28 static const char *const Blanks = " \t\v\f\r";
IsBlank(char C)29 static bool IsBlank(char C) {
30 switch (C) {
31 case ' ':
32 case '\t':
33 case '\v':
34 case '\f':
35 case '\r':
36 return true;
37 default:
38 return false;
39 }
40 }
41
getLineCommentIndentPrefix(StringRef Comment,const FormatStyle & Style)42 static StringRef getLineCommentIndentPrefix(StringRef Comment,
43 const FormatStyle &Style) {
44 static const char *const KnownCStylePrefixes[] = {"///<", "//!<", "///", "//",
45 "//!"};
46 static const char *const KnownTextProtoPrefixes[] = {"//", "#", "##", "###",
47 "####"};
48 ArrayRef<const char *> KnownPrefixes(KnownCStylePrefixes);
49 if (Style.Language == FormatStyle::LK_TextProto)
50 KnownPrefixes = KnownTextProtoPrefixes;
51
52 StringRef LongestPrefix;
53 for (StringRef KnownPrefix : KnownPrefixes) {
54 if (Comment.startswith(KnownPrefix)) {
55 size_t PrefixLength = KnownPrefix.size();
56 while (PrefixLength < Comment.size() && Comment[PrefixLength] == ' ')
57 ++PrefixLength;
58 if (PrefixLength > LongestPrefix.size())
59 LongestPrefix = Comment.substr(0, PrefixLength);
60 }
61 }
62 return LongestPrefix;
63 }
64
65 static BreakableToken::Split
getCommentSplit(StringRef Text,unsigned ContentStartColumn,unsigned ColumnLimit,unsigned TabWidth,encoding::Encoding Encoding,const FormatStyle & Style,bool DecorationEndsWithStar=false)66 getCommentSplit(StringRef Text, unsigned ContentStartColumn,
67 unsigned ColumnLimit, unsigned TabWidth,
68 encoding::Encoding Encoding, const FormatStyle &Style,
69 bool DecorationEndsWithStar = false) {
70 LLVM_DEBUG(llvm::dbgs() << "Comment split: \"" << Text
71 << "\", Column limit: " << ColumnLimit
72 << ", Content start: " << ContentStartColumn << "\n");
73 if (ColumnLimit <= ContentStartColumn + 1)
74 return BreakableToken::Split(StringRef::npos, 0);
75
76 unsigned MaxSplit = ColumnLimit - ContentStartColumn + 1;
77 unsigned MaxSplitBytes = 0;
78
79 for (unsigned NumChars = 0;
80 NumChars < MaxSplit && MaxSplitBytes < Text.size();) {
81 unsigned BytesInChar =
82 encoding::getCodePointNumBytes(Text[MaxSplitBytes], Encoding);
83 NumChars +=
84 encoding::columnWidthWithTabs(Text.substr(MaxSplitBytes, BytesInChar),
85 ContentStartColumn, TabWidth, Encoding);
86 MaxSplitBytes += BytesInChar;
87 }
88
89 StringRef::size_type SpaceOffset = Text.find_last_of(Blanks, MaxSplitBytes);
90
91 static auto *const kNumberedListRegexp = new llvm::Regex("^[1-9][0-9]?\\.");
92 while (SpaceOffset != StringRef::npos) {
93 // Do not split before a number followed by a dot: this would be interpreted
94 // as a numbered list, which would prevent re-flowing in subsequent passes.
95 if (kNumberedListRegexp->match(Text.substr(SpaceOffset).ltrim(Blanks)))
96 SpaceOffset = Text.find_last_of(Blanks, SpaceOffset);
97 // In JavaScript, some @tags can be followed by {, and machinery that parses
98 // these comments will fail to understand the comment if followed by a line
99 // break. So avoid ever breaking before a {.
100 else if (Style.Language == FormatStyle::LK_JavaScript &&
101 SpaceOffset + 1 < Text.size() && Text[SpaceOffset + 1] == '{')
102 SpaceOffset = Text.find_last_of(Blanks, SpaceOffset);
103 else
104 break;
105 }
106
107 if (SpaceOffset == StringRef::npos ||
108 // Don't break at leading whitespace.
109 Text.find_last_not_of(Blanks, SpaceOffset) == StringRef::npos) {
110 // Make sure that we don't break at leading whitespace that
111 // reaches past MaxSplit.
112 StringRef::size_type FirstNonWhitespace = Text.find_first_not_of(Blanks);
113 if (FirstNonWhitespace == StringRef::npos)
114 // If the comment is only whitespace, we cannot split.
115 return BreakableToken::Split(StringRef::npos, 0);
116 SpaceOffset = Text.find_first_of(
117 Blanks, std::max<unsigned>(MaxSplitBytes, FirstNonWhitespace));
118 }
119 if (SpaceOffset != StringRef::npos && SpaceOffset != 0) {
120 // adaptStartOfLine will break after lines starting with /** if the comment
121 // is broken anywhere. Avoid emitting this break twice here.
122 // Example: in /** longtextcomesherethatbreaks */ (with ColumnLimit 20) will
123 // insert a break after /**, so this code must not insert the same break.
124 if (SpaceOffset == 1 && Text[SpaceOffset - 1] == '*')
125 return BreakableToken::Split(StringRef::npos, 0);
126 StringRef BeforeCut = Text.substr(0, SpaceOffset).rtrim(Blanks);
127 StringRef AfterCut = Text.substr(SpaceOffset);
128 // Don't trim the leading blanks if it would create a */ after the break.
129 if (!DecorationEndsWithStar || AfterCut.size() <= 1 || AfterCut[1] != '/')
130 AfterCut = AfterCut.ltrim(Blanks);
131 return BreakableToken::Split(BeforeCut.size(),
132 AfterCut.begin() - BeforeCut.end());
133 }
134 return BreakableToken::Split(StringRef::npos, 0);
135 }
136
137 static BreakableToken::Split
getStringSplit(StringRef Text,unsigned UsedColumns,unsigned ColumnLimit,unsigned TabWidth,encoding::Encoding Encoding)138 getStringSplit(StringRef Text, unsigned UsedColumns, unsigned ColumnLimit,
139 unsigned TabWidth, encoding::Encoding Encoding) {
140 // FIXME: Reduce unit test case.
141 if (Text.empty())
142 return BreakableToken::Split(StringRef::npos, 0);
143 if (ColumnLimit <= UsedColumns)
144 return BreakableToken::Split(StringRef::npos, 0);
145 unsigned MaxSplit = ColumnLimit - UsedColumns;
146 StringRef::size_type SpaceOffset = 0;
147 StringRef::size_type SlashOffset = 0;
148 StringRef::size_type WordStartOffset = 0;
149 StringRef::size_type SplitPoint = 0;
150 for (unsigned Chars = 0;;) {
151 unsigned Advance;
152 if (Text[0] == '\\') {
153 Advance = encoding::getEscapeSequenceLength(Text);
154 Chars += Advance;
155 } else {
156 Advance = encoding::getCodePointNumBytes(Text[0], Encoding);
157 Chars += encoding::columnWidthWithTabs(
158 Text.substr(0, Advance), UsedColumns + Chars, TabWidth, Encoding);
159 }
160
161 if (Chars > MaxSplit || Text.size() <= Advance)
162 break;
163
164 if (IsBlank(Text[0]))
165 SpaceOffset = SplitPoint;
166 if (Text[0] == '/')
167 SlashOffset = SplitPoint;
168 if (Advance == 1 && !isAlphanumeric(Text[0]))
169 WordStartOffset = SplitPoint;
170
171 SplitPoint += Advance;
172 Text = Text.substr(Advance);
173 }
174
175 if (SpaceOffset != 0)
176 return BreakableToken::Split(SpaceOffset + 1, 0);
177 if (SlashOffset != 0)
178 return BreakableToken::Split(SlashOffset + 1, 0);
179 if (WordStartOffset != 0)
180 return BreakableToken::Split(WordStartOffset + 1, 0);
181 if (SplitPoint != 0)
182 return BreakableToken::Split(SplitPoint, 0);
183 return BreakableToken::Split(StringRef::npos, 0);
184 }
185
switchesFormatting(const FormatToken & Token)186 bool switchesFormatting(const FormatToken &Token) {
187 assert((Token.is(TT_BlockComment) || Token.is(TT_LineComment)) &&
188 "formatting regions are switched by comment tokens");
189 StringRef Content = Token.TokenText.substr(2).ltrim();
190 return Content.startswith("clang-format on") ||
191 Content.startswith("clang-format off");
192 }
193
194 unsigned
getLengthAfterCompression(unsigned RemainingTokenColumns,Split Split) const195 BreakableToken::getLengthAfterCompression(unsigned RemainingTokenColumns,
196 Split Split) const {
197 // Example: consider the content
198 // lala lala
199 // - RemainingTokenColumns is the original number of columns, 10;
200 // - Split is (4, 2), denoting the two spaces between the two words;
201 //
202 // We compute the number of columns when the split is compressed into a single
203 // space, like:
204 // lala lala
205 //
206 // FIXME: Correctly measure the length of whitespace in Split.second so it
207 // works with tabs.
208 return RemainingTokenColumns + 1 - Split.second;
209 }
210
getLineCount() const211 unsigned BreakableStringLiteral::getLineCount() const { return 1; }
212
getRangeLength(unsigned LineIndex,unsigned Offset,StringRef::size_type Length,unsigned StartColumn) const213 unsigned BreakableStringLiteral::getRangeLength(unsigned LineIndex,
214 unsigned Offset,
215 StringRef::size_type Length,
216 unsigned StartColumn) const {
217 llvm_unreachable("Getting the length of a part of the string literal "
218 "indicates that the code tries to reflow it.");
219 }
220
221 unsigned
getRemainingLength(unsigned LineIndex,unsigned Offset,unsigned StartColumn) const222 BreakableStringLiteral::getRemainingLength(unsigned LineIndex, unsigned Offset,
223 unsigned StartColumn) const {
224 return UnbreakableTailLength + Postfix.size() +
225 encoding::columnWidthWithTabs(Line.substr(Offset, StringRef::npos),
226 StartColumn, Style.TabWidth, Encoding);
227 }
228
getContentStartColumn(unsigned LineIndex,bool Break) const229 unsigned BreakableStringLiteral::getContentStartColumn(unsigned LineIndex,
230 bool Break) const {
231 return StartColumn + Prefix.size();
232 }
233
BreakableStringLiteral(const FormatToken & Tok,unsigned StartColumn,StringRef Prefix,StringRef Postfix,unsigned UnbreakableTailLength,bool InPPDirective,encoding::Encoding Encoding,const FormatStyle & Style)234 BreakableStringLiteral::BreakableStringLiteral(
235 const FormatToken &Tok, unsigned StartColumn, StringRef Prefix,
236 StringRef Postfix, unsigned UnbreakableTailLength, bool InPPDirective,
237 encoding::Encoding Encoding, const FormatStyle &Style)
238 : BreakableToken(Tok, InPPDirective, Encoding, Style),
239 StartColumn(StartColumn), Prefix(Prefix), Postfix(Postfix),
240 UnbreakableTailLength(UnbreakableTailLength) {
241 assert(Tok.TokenText.startswith(Prefix) && Tok.TokenText.endswith(Postfix));
242 Line = Tok.TokenText.substr(
243 Prefix.size(), Tok.TokenText.size() - Prefix.size() - Postfix.size());
244 }
245
getSplit(unsigned LineIndex,unsigned TailOffset,unsigned ColumnLimit,unsigned ContentStartColumn,llvm::Regex & CommentPragmasRegex) const246 BreakableToken::Split BreakableStringLiteral::getSplit(
247 unsigned LineIndex, unsigned TailOffset, unsigned ColumnLimit,
248 unsigned ContentStartColumn, llvm::Regex &CommentPragmasRegex) const {
249 return getStringSplit(Line.substr(TailOffset), ContentStartColumn,
250 ColumnLimit - Postfix.size(), Style.TabWidth, Encoding);
251 }
252
insertBreak(unsigned LineIndex,unsigned TailOffset,Split Split,unsigned ContentIndent,WhitespaceManager & Whitespaces) const253 void BreakableStringLiteral::insertBreak(unsigned LineIndex,
254 unsigned TailOffset, Split Split,
255 unsigned ContentIndent,
256 WhitespaceManager &Whitespaces) const {
257 Whitespaces.replaceWhitespaceInToken(
258 Tok, Prefix.size() + TailOffset + Split.first, Split.second, Postfix,
259 Prefix, InPPDirective, 1, StartColumn);
260 }
261
BreakableComment(const FormatToken & Token,unsigned StartColumn,bool InPPDirective,encoding::Encoding Encoding,const FormatStyle & Style)262 BreakableComment::BreakableComment(const FormatToken &Token,
263 unsigned StartColumn, bool InPPDirective,
264 encoding::Encoding Encoding,
265 const FormatStyle &Style)
266 : BreakableToken(Token, InPPDirective, Encoding, Style),
267 StartColumn(StartColumn) {}
268
getLineCount() const269 unsigned BreakableComment::getLineCount() const { return Lines.size(); }
270
271 BreakableToken::Split
getSplit(unsigned LineIndex,unsigned TailOffset,unsigned ColumnLimit,unsigned ContentStartColumn,llvm::Regex & CommentPragmasRegex) const272 BreakableComment::getSplit(unsigned LineIndex, unsigned TailOffset,
273 unsigned ColumnLimit, unsigned ContentStartColumn,
274 llvm::Regex &CommentPragmasRegex) const {
275 // Don't break lines matching the comment pragmas regex.
276 if (CommentPragmasRegex.match(Content[LineIndex]))
277 return Split(StringRef::npos, 0);
278 return getCommentSplit(Content[LineIndex].substr(TailOffset),
279 ContentStartColumn, ColumnLimit, Style.TabWidth,
280 Encoding, Style);
281 }
282
compressWhitespace(unsigned LineIndex,unsigned TailOffset,Split Split,WhitespaceManager & Whitespaces) const283 void BreakableComment::compressWhitespace(
284 unsigned LineIndex, unsigned TailOffset, Split Split,
285 WhitespaceManager &Whitespaces) const {
286 StringRef Text = Content[LineIndex].substr(TailOffset);
287 // Text is relative to the content line, but Whitespaces operates relative to
288 // the start of the corresponding token, so compute the start of the Split
289 // that needs to be compressed into a single space relative to the start of
290 // its token.
291 unsigned BreakOffsetInToken =
292 Text.data() - tokenAt(LineIndex).TokenText.data() + Split.first;
293 unsigned CharsToRemove = Split.second;
294 Whitespaces.replaceWhitespaceInToken(
295 tokenAt(LineIndex), BreakOffsetInToken, CharsToRemove, "", "",
296 /*InPPDirective=*/false, /*Newlines=*/0, /*Spaces=*/1);
297 }
298
tokenAt(unsigned LineIndex) const299 const FormatToken &BreakableComment::tokenAt(unsigned LineIndex) const {
300 return Tokens[LineIndex] ? *Tokens[LineIndex] : Tok;
301 }
302
mayReflowContent(StringRef Content)303 static bool mayReflowContent(StringRef Content) {
304 Content = Content.trim(Blanks);
305 // Lines starting with '@' commonly have special meaning.
306 // Lines starting with '-', '-#', '+' or '*' are bulleted/numbered lists.
307 bool hasSpecialMeaningPrefix = false;
308 for (StringRef Prefix :
309 {"@", "TODO", "FIXME", "XXX", "-# ", "- ", "+ ", "* "}) {
310 if (Content.startswith(Prefix)) {
311 hasSpecialMeaningPrefix = true;
312 break;
313 }
314 }
315
316 // Numbered lists may also start with a number followed by '.'
317 // To avoid issues if a line starts with a number which is actually the end
318 // of a previous line, we only consider numbers with up to 2 digits.
319 static auto *const kNumberedListRegexp = new llvm::Regex("^[1-9][0-9]?\\. ");
320 hasSpecialMeaningPrefix =
321 hasSpecialMeaningPrefix || kNumberedListRegexp->match(Content);
322
323 // Simple heuristic for what to reflow: content should contain at least two
324 // characters and either the first or second character must be
325 // non-punctuation.
326 return Content.size() >= 2 && !hasSpecialMeaningPrefix &&
327 !Content.endswith("\\") &&
328 // Note that this is UTF-8 safe, since if isPunctuation(Content[0]) is
329 // true, then the first code point must be 1 byte long.
330 (!isPunctuation(Content[0]) || !isPunctuation(Content[1]));
331 }
332
BreakableBlockComment(const FormatToken & Token,unsigned StartColumn,unsigned OriginalStartColumn,bool FirstInLine,bool InPPDirective,encoding::Encoding Encoding,const FormatStyle & Style,bool UseCRLF)333 BreakableBlockComment::BreakableBlockComment(
334 const FormatToken &Token, unsigned StartColumn,
335 unsigned OriginalStartColumn, bool FirstInLine, bool InPPDirective,
336 encoding::Encoding Encoding, const FormatStyle &Style, bool UseCRLF)
337 : BreakableComment(Token, StartColumn, InPPDirective, Encoding, Style),
338 DelimitersOnNewline(false),
339 UnbreakableTailLength(Token.UnbreakableTailLength) {
340 assert(Tok.is(TT_BlockComment) &&
341 "block comment section must start with a block comment");
342
343 StringRef TokenText(Tok.TokenText);
344 assert(TokenText.startswith("/*") && TokenText.endswith("*/"));
345 TokenText.substr(2, TokenText.size() - 4).split(Lines,
346 UseCRLF ? "\r\n" : "\n");
347
348 int IndentDelta = StartColumn - OriginalStartColumn;
349 Content.resize(Lines.size());
350 Content[0] = Lines[0];
351 ContentColumn.resize(Lines.size());
352 // Account for the initial '/*'.
353 ContentColumn[0] = StartColumn + 2;
354 Tokens.resize(Lines.size());
355 for (size_t i = 1; i < Lines.size(); ++i)
356 adjustWhitespace(i, IndentDelta);
357
358 // Align decorations with the column of the star on the first line,
359 // that is one column after the start "/*".
360 DecorationColumn = StartColumn + 1;
361
362 // Account for comment decoration patterns like this:
363 //
364 // /*
365 // ** blah blah blah
366 // */
367 if (Lines.size() >= 2 && Content[1].startswith("**") &&
368 static_cast<unsigned>(ContentColumn[1]) == StartColumn) {
369 DecorationColumn = StartColumn;
370 }
371
372 Decoration = "* ";
373 if (Lines.size() == 1 && !FirstInLine) {
374 // Comments for which FirstInLine is false can start on arbitrary column,
375 // and available horizontal space can be too small to align consecutive
376 // lines with the first one.
377 // FIXME: We could, probably, align them to current indentation level, but
378 // now we just wrap them without stars.
379 Decoration = "";
380 }
381 for (size_t i = 1, e = Lines.size(); i < e && !Decoration.empty(); ++i) {
382 // If the last line is empty, the closing "*/" will have a star.
383 if (i + 1 == e && Content[i].empty())
384 break;
385 if (!Content[i].empty() && i + 1 != e && Decoration.startswith(Content[i]))
386 continue;
387 while (!Content[i].startswith(Decoration))
388 Decoration = Decoration.substr(0, Decoration.size() - 1);
389 }
390
391 LastLineNeedsDecoration = true;
392 IndentAtLineBreak = ContentColumn[0] + 1;
393 for (size_t i = 1, e = Lines.size(); i < e; ++i) {
394 if (Content[i].empty()) {
395 if (i + 1 == e) {
396 // Empty last line means that we already have a star as a part of the
397 // trailing */. We also need to preserve whitespace, so that */ is
398 // correctly indented.
399 LastLineNeedsDecoration = false;
400 // Align the star in the last '*/' with the stars on the previous lines.
401 if (e >= 2 && !Decoration.empty()) {
402 ContentColumn[i] = DecorationColumn;
403 }
404 } else if (Decoration.empty()) {
405 // For all other lines, set the start column to 0 if they're empty, so
406 // we do not insert trailing whitespace anywhere.
407 ContentColumn[i] = 0;
408 }
409 continue;
410 }
411
412 // The first line already excludes the star.
413 // The last line excludes the star if LastLineNeedsDecoration is false.
414 // For all other lines, adjust the line to exclude the star and
415 // (optionally) the first whitespace.
416 unsigned DecorationSize = Decoration.startswith(Content[i])
417 ? Content[i].size()
418 : Decoration.size();
419 if (DecorationSize) {
420 ContentColumn[i] = DecorationColumn + DecorationSize;
421 }
422 Content[i] = Content[i].substr(DecorationSize);
423 if (!Decoration.startswith(Content[i]))
424 IndentAtLineBreak =
425 std::min<int>(IndentAtLineBreak, std::max(0, ContentColumn[i]));
426 }
427 IndentAtLineBreak = std::max<unsigned>(IndentAtLineBreak, Decoration.size());
428
429 // Detect a multiline jsdoc comment and set DelimitersOnNewline in that case.
430 if (Style.Language == FormatStyle::LK_JavaScript ||
431 Style.Language == FormatStyle::LK_Java) {
432 if ((Lines[0] == "*" || Lines[0].startswith("* ")) && Lines.size() > 1) {
433 // This is a multiline jsdoc comment.
434 DelimitersOnNewline = true;
435 } else if (Lines[0].startswith("* ") && Lines.size() == 1) {
436 // Detect a long single-line comment, like:
437 // /** long long long */
438 // Below, '2' is the width of '*/'.
439 unsigned EndColumn =
440 ContentColumn[0] +
441 encoding::columnWidthWithTabs(Lines[0], ContentColumn[0],
442 Style.TabWidth, Encoding) +
443 2;
444 DelimitersOnNewline = EndColumn > Style.ColumnLimit;
445 }
446 }
447
448 LLVM_DEBUG({
449 llvm::dbgs() << "IndentAtLineBreak " << IndentAtLineBreak << "\n";
450 llvm::dbgs() << "DelimitersOnNewline " << DelimitersOnNewline << "\n";
451 for (size_t i = 0; i < Lines.size(); ++i) {
452 llvm::dbgs() << i << " |" << Content[i] << "| "
453 << "CC=" << ContentColumn[i] << "| "
454 << "IN=" << (Content[i].data() - Lines[i].data()) << "\n";
455 }
456 });
457 }
458
459 BreakableToken::Split
getSplit(unsigned LineIndex,unsigned TailOffset,unsigned ColumnLimit,unsigned ContentStartColumn,llvm::Regex & CommentPragmasRegex) const460 BreakableBlockComment::getSplit(unsigned LineIndex, unsigned TailOffset,
461 unsigned ColumnLimit, unsigned ContentStartColumn,
462 llvm::Regex &CommentPragmasRegex) const {
463 // Don't break lines matching the comment pragmas regex.
464 if (CommentPragmasRegex.match(Content[LineIndex]))
465 return Split(StringRef::npos, 0);
466 return getCommentSplit(Content[LineIndex].substr(TailOffset),
467 ContentStartColumn, ColumnLimit, Style.TabWidth,
468 Encoding, Style, Decoration.endswith("*"));
469 }
470
adjustWhitespace(unsigned LineIndex,int IndentDelta)471 void BreakableBlockComment::adjustWhitespace(unsigned LineIndex,
472 int IndentDelta) {
473 // When in a preprocessor directive, the trailing backslash in a block comment
474 // is not needed, but can serve a purpose of uniformity with necessary escaped
475 // newlines outside the comment. In this case we remove it here before
476 // trimming the trailing whitespace. The backslash will be re-added later when
477 // inserting a line break.
478 size_t EndOfPreviousLine = Lines[LineIndex - 1].size();
479 if (InPPDirective && Lines[LineIndex - 1].endswith("\\"))
480 --EndOfPreviousLine;
481
482 // Calculate the end of the non-whitespace text in the previous line.
483 EndOfPreviousLine =
484 Lines[LineIndex - 1].find_last_not_of(Blanks, EndOfPreviousLine);
485 if (EndOfPreviousLine == StringRef::npos)
486 EndOfPreviousLine = 0;
487 else
488 ++EndOfPreviousLine;
489 // Calculate the start of the non-whitespace text in the current line.
490 size_t StartOfLine = Lines[LineIndex].find_first_not_of(Blanks);
491 if (StartOfLine == StringRef::npos)
492 StartOfLine = Lines[LineIndex].size();
493
494 StringRef Whitespace = Lines[LineIndex].substr(0, StartOfLine);
495 // Adjust Lines to only contain relevant text.
496 size_t PreviousContentOffset =
497 Content[LineIndex - 1].data() - Lines[LineIndex - 1].data();
498 Content[LineIndex - 1] = Lines[LineIndex - 1].substr(
499 PreviousContentOffset, EndOfPreviousLine - PreviousContentOffset);
500 Content[LineIndex] = Lines[LineIndex].substr(StartOfLine);
501
502 // Adjust the start column uniformly across all lines.
503 ContentColumn[LineIndex] =
504 encoding::columnWidthWithTabs(Whitespace, 0, Style.TabWidth, Encoding) +
505 IndentDelta;
506 }
507
getRangeLength(unsigned LineIndex,unsigned Offset,StringRef::size_type Length,unsigned StartColumn) const508 unsigned BreakableBlockComment::getRangeLength(unsigned LineIndex,
509 unsigned Offset,
510 StringRef::size_type Length,
511 unsigned StartColumn) const {
512 unsigned LineLength =
513 encoding::columnWidthWithTabs(Content[LineIndex].substr(Offset, Length),
514 StartColumn, Style.TabWidth, Encoding);
515 // FIXME: This should go into getRemainingLength instead, but we currently
516 // break tests when putting it there. Investigate how to fix those tests.
517 // The last line gets a "*/" postfix.
518 if (LineIndex + 1 == Lines.size()) {
519 LineLength += 2;
520 // We never need a decoration when breaking just the trailing "*/" postfix.
521 // Note that checking that Length == 0 is not enough, since Length could
522 // also be StringRef::npos.
523 if (Content[LineIndex].substr(Offset, StringRef::npos).empty()) {
524 LineLength -= Decoration.size();
525 }
526 }
527 return LineLength;
528 }
529
getRemainingLength(unsigned LineIndex,unsigned Offset,unsigned StartColumn) const530 unsigned BreakableBlockComment::getRemainingLength(unsigned LineIndex,
531 unsigned Offset,
532 unsigned StartColumn) const {
533 return UnbreakableTailLength +
534 getRangeLength(LineIndex, Offset, StringRef::npos, StartColumn);
535 }
536
getContentStartColumn(unsigned LineIndex,bool Break) const537 unsigned BreakableBlockComment::getContentStartColumn(unsigned LineIndex,
538 bool Break) const {
539 if (Break)
540 return IndentAtLineBreak;
541 return std::max(0, ContentColumn[LineIndex]);
542 }
543
544 const llvm::StringSet<>
545 BreakableBlockComment::ContentIndentingJavadocAnnotations = {
546 "@param", "@return", "@returns", "@throws", "@type", "@template",
547 "@see", "@deprecated", "@define", "@exports", "@mods", "@private",
548 };
549
getContentIndent(unsigned LineIndex) const550 unsigned BreakableBlockComment::getContentIndent(unsigned LineIndex) const {
551 if (Style.Language != FormatStyle::LK_Java &&
552 Style.Language != FormatStyle::LK_JavaScript)
553 return 0;
554 // The content at LineIndex 0 of a comment like:
555 // /** line 0 */
556 // is "* line 0", so we need to skip over the decoration in that case.
557 StringRef ContentWithNoDecoration = Content[LineIndex];
558 if (LineIndex == 0 && ContentWithNoDecoration.startswith("*")) {
559 ContentWithNoDecoration = ContentWithNoDecoration.substr(1).ltrim(Blanks);
560 }
561 StringRef FirstWord = ContentWithNoDecoration.substr(
562 0, ContentWithNoDecoration.find_first_of(Blanks));
563 if (ContentIndentingJavadocAnnotations.find(FirstWord) !=
564 ContentIndentingJavadocAnnotations.end())
565 return Style.ContinuationIndentWidth;
566 return 0;
567 }
568
insertBreak(unsigned LineIndex,unsigned TailOffset,Split Split,unsigned ContentIndent,WhitespaceManager & Whitespaces) const569 void BreakableBlockComment::insertBreak(unsigned LineIndex, unsigned TailOffset,
570 Split Split, unsigned ContentIndent,
571 WhitespaceManager &Whitespaces) const {
572 StringRef Text = Content[LineIndex].substr(TailOffset);
573 StringRef Prefix = Decoration;
574 // We need this to account for the case when we have a decoration "* " for all
575 // the lines except for the last one, where the star in "*/" acts as a
576 // decoration.
577 unsigned LocalIndentAtLineBreak = IndentAtLineBreak;
578 if (LineIndex + 1 == Lines.size() &&
579 Text.size() == Split.first + Split.second) {
580 // For the last line we need to break before "*/", but not to add "* ".
581 Prefix = "";
582 if (LocalIndentAtLineBreak >= 2)
583 LocalIndentAtLineBreak -= 2;
584 }
585 // The split offset is from the beginning of the line. Convert it to an offset
586 // from the beginning of the token text.
587 unsigned BreakOffsetInToken =
588 Text.data() - tokenAt(LineIndex).TokenText.data() + Split.first;
589 unsigned CharsToRemove = Split.second;
590 assert(LocalIndentAtLineBreak >= Prefix.size());
591 std::string PrefixWithTrailingIndent = Prefix;
592 for (unsigned I = 0; I < ContentIndent; ++I)
593 PrefixWithTrailingIndent += " ";
594 Whitespaces.replaceWhitespaceInToken(
595 tokenAt(LineIndex), BreakOffsetInToken, CharsToRemove, "",
596 PrefixWithTrailingIndent, InPPDirective, /*Newlines=*/1,
597 /*Spaces=*/LocalIndentAtLineBreak + ContentIndent -
598 PrefixWithTrailingIndent.size());
599 }
600
601 BreakableToken::Split
getReflowSplit(unsigned LineIndex,llvm::Regex & CommentPragmasRegex) const602 BreakableBlockComment::getReflowSplit(unsigned LineIndex,
603 llvm::Regex &CommentPragmasRegex) const {
604 if (!mayReflow(LineIndex, CommentPragmasRegex))
605 return Split(StringRef::npos, 0);
606
607 // If we're reflowing into a line with content indent, only reflow the next
608 // line if its starting whitespace matches the content indent.
609 size_t Trimmed = Content[LineIndex].find_first_not_of(Blanks);
610 if (LineIndex) {
611 unsigned PreviousContentIndent = getContentIndent(LineIndex - 1);
612 if (PreviousContentIndent && Trimmed != StringRef::npos &&
613 Trimmed != PreviousContentIndent)
614 return Split(StringRef::npos, 0);
615 }
616
617 return Split(0, Trimmed != StringRef::npos ? Trimmed : 0);
618 }
619
introducesBreakBeforeToken() const620 bool BreakableBlockComment::introducesBreakBeforeToken() const {
621 // A break is introduced when we want delimiters on newline.
622 return DelimitersOnNewline &&
623 Lines[0].substr(1).find_first_not_of(Blanks) != StringRef::npos;
624 }
625
reflow(unsigned LineIndex,WhitespaceManager & Whitespaces) const626 void BreakableBlockComment::reflow(unsigned LineIndex,
627 WhitespaceManager &Whitespaces) const {
628 StringRef TrimmedContent = Content[LineIndex].ltrim(Blanks);
629 // Here we need to reflow.
630 assert(Tokens[LineIndex - 1] == Tokens[LineIndex] &&
631 "Reflowing whitespace within a token");
632 // This is the offset of the end of the last line relative to the start of
633 // the token text in the token.
634 unsigned WhitespaceOffsetInToken = Content[LineIndex - 1].data() +
635 Content[LineIndex - 1].size() -
636 tokenAt(LineIndex).TokenText.data();
637 unsigned WhitespaceLength = TrimmedContent.data() -
638 tokenAt(LineIndex).TokenText.data() -
639 WhitespaceOffsetInToken;
640 Whitespaces.replaceWhitespaceInToken(
641 tokenAt(LineIndex), WhitespaceOffsetInToken,
642 /*ReplaceChars=*/WhitespaceLength, /*PreviousPostfix=*/"",
643 /*CurrentPrefix=*/ReflowPrefix, InPPDirective, /*Newlines=*/0,
644 /*Spaces=*/0);
645 }
646
adaptStartOfLine(unsigned LineIndex,WhitespaceManager & Whitespaces) const647 void BreakableBlockComment::adaptStartOfLine(
648 unsigned LineIndex, WhitespaceManager &Whitespaces) const {
649 if (LineIndex == 0) {
650 if (DelimitersOnNewline) {
651 // Since we're breaking at index 1 below, the break position and the
652 // break length are the same.
653 // Note: this works because getCommentSplit is careful never to split at
654 // the beginning of a line.
655 size_t BreakLength = Lines[0].substr(1).find_first_not_of(Blanks);
656 if (BreakLength != StringRef::npos)
657 insertBreak(LineIndex, 0, Split(1, BreakLength), /*ContentIndent=*/0,
658 Whitespaces);
659 }
660 return;
661 }
662 // Here no reflow with the previous line will happen.
663 // Fix the decoration of the line at LineIndex.
664 StringRef Prefix = Decoration;
665 if (Content[LineIndex].empty()) {
666 if (LineIndex + 1 == Lines.size()) {
667 if (!LastLineNeedsDecoration) {
668 // If the last line was empty, we don't need a prefix, as the */ will
669 // line up with the decoration (if it exists).
670 Prefix = "";
671 }
672 } else if (!Decoration.empty()) {
673 // For other empty lines, if we do have a decoration, adapt it to not
674 // contain a trailing whitespace.
675 Prefix = Prefix.substr(0, 1);
676 }
677 } else {
678 if (ContentColumn[LineIndex] == 1) {
679 // This line starts immediately after the decorating *.
680 Prefix = Prefix.substr(0, 1);
681 }
682 }
683 // This is the offset of the end of the last line relative to the start of the
684 // token text in the token.
685 unsigned WhitespaceOffsetInToken = Content[LineIndex - 1].data() +
686 Content[LineIndex - 1].size() -
687 tokenAt(LineIndex).TokenText.data();
688 unsigned WhitespaceLength = Content[LineIndex].data() -
689 tokenAt(LineIndex).TokenText.data() -
690 WhitespaceOffsetInToken;
691 Whitespaces.replaceWhitespaceInToken(
692 tokenAt(LineIndex), WhitespaceOffsetInToken, WhitespaceLength, "", Prefix,
693 InPPDirective, /*Newlines=*/1, ContentColumn[LineIndex] - Prefix.size());
694 }
695
696 BreakableToken::Split
getSplitAfterLastLine(unsigned TailOffset) const697 BreakableBlockComment::getSplitAfterLastLine(unsigned TailOffset) const {
698 if (DelimitersOnNewline) {
699 // Replace the trailing whitespace of the last line with a newline.
700 // In case the last line is empty, the ending '*/' is already on its own
701 // line.
702 StringRef Line = Content.back().substr(TailOffset);
703 StringRef TrimmedLine = Line.rtrim(Blanks);
704 if (!TrimmedLine.empty())
705 return Split(TrimmedLine.size(), Line.size() - TrimmedLine.size());
706 }
707 return Split(StringRef::npos, 0);
708 }
709
mayReflow(unsigned LineIndex,llvm::Regex & CommentPragmasRegex) const710 bool BreakableBlockComment::mayReflow(unsigned LineIndex,
711 llvm::Regex &CommentPragmasRegex) const {
712 // Content[LineIndex] may exclude the indent after the '*' decoration. In that
713 // case, we compute the start of the comment pragma manually.
714 StringRef IndentContent = Content[LineIndex];
715 if (Lines[LineIndex].ltrim(Blanks).startswith("*")) {
716 IndentContent = Lines[LineIndex].ltrim(Blanks).substr(1);
717 }
718 return LineIndex > 0 && !CommentPragmasRegex.match(IndentContent) &&
719 mayReflowContent(Content[LineIndex]) && !Tok.Finalized &&
720 !switchesFormatting(tokenAt(LineIndex));
721 }
722
BreakableLineCommentSection(const FormatToken & Token,unsigned StartColumn,unsigned OriginalStartColumn,bool FirstInLine,bool InPPDirective,encoding::Encoding Encoding,const FormatStyle & Style)723 BreakableLineCommentSection::BreakableLineCommentSection(
724 const FormatToken &Token, unsigned StartColumn,
725 unsigned OriginalStartColumn, bool FirstInLine, bool InPPDirective,
726 encoding::Encoding Encoding, const FormatStyle &Style)
727 : BreakableComment(Token, StartColumn, InPPDirective, Encoding, Style) {
728 assert(Tok.is(TT_LineComment) &&
729 "line comment section must start with a line comment");
730 FormatToken *LineTok = nullptr;
731 for (const FormatToken *CurrentTok = &Tok;
732 CurrentTok && CurrentTok->is(TT_LineComment);
733 CurrentTok = CurrentTok->Next) {
734 LastLineTok = LineTok;
735 StringRef TokenText(CurrentTok->TokenText);
736 assert((TokenText.startswith("//") || TokenText.startswith("#")) &&
737 "unsupported line comment prefix, '//' and '#' are supported");
738 size_t FirstLineIndex = Lines.size();
739 TokenText.split(Lines, "\n");
740 Content.resize(Lines.size());
741 ContentColumn.resize(Lines.size());
742 OriginalContentColumn.resize(Lines.size());
743 Tokens.resize(Lines.size());
744 Prefix.resize(Lines.size());
745 OriginalPrefix.resize(Lines.size());
746 for (size_t i = FirstLineIndex, e = Lines.size(); i < e; ++i) {
747 Lines[i] = Lines[i].ltrim(Blanks);
748 // We need to trim the blanks in case this is not the first line in a
749 // multiline comment. Then the indent is included in Lines[i].
750 StringRef IndentPrefix =
751 getLineCommentIndentPrefix(Lines[i].ltrim(Blanks), Style);
752 assert((TokenText.startswith("//") || TokenText.startswith("#")) &&
753 "unsupported line comment prefix, '//' and '#' are supported");
754 OriginalPrefix[i] = Prefix[i] = IndentPrefix;
755 if (Lines[i].size() > Prefix[i].size() &&
756 isAlphanumeric(Lines[i][Prefix[i].size()])) {
757 if (Prefix[i] == "//")
758 Prefix[i] = "// ";
759 else if (Prefix[i] == "///")
760 Prefix[i] = "/// ";
761 else if (Prefix[i] == "//!")
762 Prefix[i] = "//! ";
763 else if (Prefix[i] == "///<")
764 Prefix[i] = "///< ";
765 else if (Prefix[i] == "//!<")
766 Prefix[i] = "//!< ";
767 else if (Prefix[i] == "#" &&
768 Style.Language == FormatStyle::LK_TextProto)
769 Prefix[i] = "# ";
770 }
771
772 Tokens[i] = LineTok;
773 Content[i] = Lines[i].substr(IndentPrefix.size());
774 OriginalContentColumn[i] =
775 StartColumn + encoding::columnWidthWithTabs(OriginalPrefix[i],
776 StartColumn,
777 Style.TabWidth, Encoding);
778 ContentColumn[i] =
779 StartColumn + encoding::columnWidthWithTabs(Prefix[i], StartColumn,
780 Style.TabWidth, Encoding);
781
782 // Calculate the end of the non-whitespace text in this line.
783 size_t EndOfLine = Content[i].find_last_not_of(Blanks);
784 if (EndOfLine == StringRef::npos)
785 EndOfLine = Content[i].size();
786 else
787 ++EndOfLine;
788 Content[i] = Content[i].substr(0, EndOfLine);
789 }
790 LineTok = CurrentTok->Next;
791 if (CurrentTok->Next && !CurrentTok->Next->ContinuesLineCommentSection) {
792 // A line comment section needs to broken by a line comment that is
793 // preceded by at least two newlines. Note that we put this break here
794 // instead of breaking at a previous stage during parsing, since that
795 // would split the contents of the enum into two unwrapped lines in this
796 // example, which is undesirable:
797 // enum A {
798 // a, // comment about a
799 //
800 // // comment about b
801 // b
802 // };
803 //
804 // FIXME: Consider putting separate line comment sections as children to
805 // the unwrapped line instead.
806 break;
807 }
808 }
809 }
810
811 unsigned
getRangeLength(unsigned LineIndex,unsigned Offset,StringRef::size_type Length,unsigned StartColumn) const812 BreakableLineCommentSection::getRangeLength(unsigned LineIndex, unsigned Offset,
813 StringRef::size_type Length,
814 unsigned StartColumn) const {
815 return encoding::columnWidthWithTabs(
816 Content[LineIndex].substr(Offset, Length), StartColumn, Style.TabWidth,
817 Encoding);
818 }
819
getContentStartColumn(unsigned LineIndex,bool Break) const820 unsigned BreakableLineCommentSection::getContentStartColumn(unsigned LineIndex,
821 bool Break) const {
822 if (Break)
823 return OriginalContentColumn[LineIndex];
824 return ContentColumn[LineIndex];
825 }
826
insertBreak(unsigned LineIndex,unsigned TailOffset,Split Split,unsigned ContentIndent,WhitespaceManager & Whitespaces) const827 void BreakableLineCommentSection::insertBreak(
828 unsigned LineIndex, unsigned TailOffset, Split Split,
829 unsigned ContentIndent, WhitespaceManager &Whitespaces) const {
830 StringRef Text = Content[LineIndex].substr(TailOffset);
831 // Compute the offset of the split relative to the beginning of the token
832 // text.
833 unsigned BreakOffsetInToken =
834 Text.data() - tokenAt(LineIndex).TokenText.data() + Split.first;
835 unsigned CharsToRemove = Split.second;
836 // Compute the size of the new indent, including the size of the new prefix of
837 // the newly broken line.
838 unsigned IndentAtLineBreak = OriginalContentColumn[LineIndex] +
839 Prefix[LineIndex].size() -
840 OriginalPrefix[LineIndex].size();
841 assert(IndentAtLineBreak >= Prefix[LineIndex].size());
842 Whitespaces.replaceWhitespaceInToken(
843 tokenAt(LineIndex), BreakOffsetInToken, CharsToRemove, "",
844 Prefix[LineIndex], InPPDirective, /*Newlines=*/1,
845 /*Spaces=*/IndentAtLineBreak - Prefix[LineIndex].size());
846 }
847
getReflowSplit(unsigned LineIndex,llvm::Regex & CommentPragmasRegex) const848 BreakableComment::Split BreakableLineCommentSection::getReflowSplit(
849 unsigned LineIndex, llvm::Regex &CommentPragmasRegex) const {
850 if (!mayReflow(LineIndex, CommentPragmasRegex))
851 return Split(StringRef::npos, 0);
852
853 size_t Trimmed = Content[LineIndex].find_first_not_of(Blanks);
854
855 // In a line comment section each line is a separate token; thus, after a
856 // split we replace all whitespace before the current line comment token
857 // (which does not need to be included in the split), plus the start of the
858 // line up to where the content starts.
859 return Split(0, Trimmed != StringRef::npos ? Trimmed : 0);
860 }
861
reflow(unsigned LineIndex,WhitespaceManager & Whitespaces) const862 void BreakableLineCommentSection::reflow(unsigned LineIndex,
863 WhitespaceManager &Whitespaces) const {
864 if (LineIndex > 0 && Tokens[LineIndex] != Tokens[LineIndex - 1]) {
865 // Reflow happens between tokens. Replace the whitespace between the
866 // tokens by the empty string.
867 Whitespaces.replaceWhitespace(
868 *Tokens[LineIndex], /*Newlines=*/0, /*Spaces=*/0,
869 /*StartOfTokenColumn=*/StartColumn, /*InPPDirective=*/false);
870 } else if (LineIndex > 0) {
871 // In case we're reflowing after the '\' in:
872 //
873 // // line comment \
874 // // line 2
875 //
876 // the reflow happens inside the single comment token (it is a single line
877 // comment with an unescaped newline).
878 // Replace the whitespace between the '\' and '//' with the empty string.
879 //
880 // Offset points to after the '\' relative to start of the token.
881 unsigned Offset = Lines[LineIndex - 1].data() +
882 Lines[LineIndex - 1].size() -
883 tokenAt(LineIndex - 1).TokenText.data();
884 // WhitespaceLength is the number of chars between the '\' and the '//' on
885 // the next line.
886 unsigned WhitespaceLength =
887 Lines[LineIndex].data() - tokenAt(LineIndex).TokenText.data() - Offset;
888 Whitespaces.replaceWhitespaceInToken(*Tokens[LineIndex], Offset,
889 /*ReplaceChars=*/WhitespaceLength,
890 /*PreviousPostfix=*/"",
891 /*CurrentPrefix=*/"",
892 /*InPPDirective=*/false,
893 /*Newlines=*/0,
894 /*Spaces=*/0);
895 }
896 // Replace the indent and prefix of the token with the reflow prefix.
897 unsigned Offset =
898 Lines[LineIndex].data() - tokenAt(LineIndex).TokenText.data();
899 unsigned WhitespaceLength =
900 Content[LineIndex].data() - Lines[LineIndex].data();
901 Whitespaces.replaceWhitespaceInToken(*Tokens[LineIndex], Offset,
902 /*ReplaceChars=*/WhitespaceLength,
903 /*PreviousPostfix=*/"",
904 /*CurrentPrefix=*/ReflowPrefix,
905 /*InPPDirective=*/false,
906 /*Newlines=*/0,
907 /*Spaces=*/0);
908 }
909
adaptStartOfLine(unsigned LineIndex,WhitespaceManager & Whitespaces) const910 void BreakableLineCommentSection::adaptStartOfLine(
911 unsigned LineIndex, WhitespaceManager &Whitespaces) const {
912 // If this is the first line of a token, we need to inform Whitespace Manager
913 // about it: either adapt the whitespace range preceding it, or mark it as an
914 // untouchable token.
915 // This happens for instance here:
916 // // line 1 \
917 // // line 2
918 if (LineIndex > 0 && Tokens[LineIndex] != Tokens[LineIndex - 1]) {
919 // This is the first line for the current token, but no reflow with the
920 // previous token is necessary. However, we still may need to adjust the
921 // start column. Note that ContentColumn[LineIndex] is the expected
922 // content column after a possible update to the prefix, hence the prefix
923 // length change is included.
924 unsigned LineColumn =
925 ContentColumn[LineIndex] -
926 (Content[LineIndex].data() - Lines[LineIndex].data()) +
927 (OriginalPrefix[LineIndex].size() - Prefix[LineIndex].size());
928
929 // We always want to create a replacement instead of adding an untouchable
930 // token, even if LineColumn is the same as the original column of the
931 // token. This is because WhitespaceManager doesn't align trailing
932 // comments if they are untouchable.
933 Whitespaces.replaceWhitespace(*Tokens[LineIndex],
934 /*Newlines=*/1,
935 /*Spaces=*/LineColumn,
936 /*StartOfTokenColumn=*/LineColumn,
937 /*InPPDirective=*/false);
938 }
939 if (OriginalPrefix[LineIndex] != Prefix[LineIndex]) {
940 // Adjust the prefix if necessary.
941
942 // Take care of the space possibly introduced after a decoration.
943 assert(Prefix[LineIndex] == (OriginalPrefix[LineIndex] + " ").str() &&
944 "Expecting a line comment prefix to differ from original by at most "
945 "a space");
946 Whitespaces.replaceWhitespaceInToken(
947 tokenAt(LineIndex), OriginalPrefix[LineIndex].size(), 0, "", "",
948 /*InPPDirective=*/false, /*Newlines=*/0, /*Spaces=*/1);
949 }
950 }
951
updateNextToken(LineState & State) const952 void BreakableLineCommentSection::updateNextToken(LineState &State) const {
953 if (LastLineTok) {
954 State.NextToken = LastLineTok->Next;
955 }
956 }
957
mayReflow(unsigned LineIndex,llvm::Regex & CommentPragmasRegex) const958 bool BreakableLineCommentSection::mayReflow(
959 unsigned LineIndex, llvm::Regex &CommentPragmasRegex) const {
960 // Line comments have the indent as part of the prefix, so we need to
961 // recompute the start of the line.
962 StringRef IndentContent = Content[LineIndex];
963 if (Lines[LineIndex].startswith("//")) {
964 IndentContent = Lines[LineIndex].substr(2);
965 }
966 // FIXME: Decide whether we want to reflow non-regular indents:
967 // Currently, we only reflow when the OriginalPrefix[LineIndex] matches the
968 // OriginalPrefix[LineIndex-1]. That means we don't reflow
969 // // text that protrudes
970 // // into text with different indent
971 // We do reflow in that case in block comments.
972 return LineIndex > 0 && !CommentPragmasRegex.match(IndentContent) &&
973 mayReflowContent(Content[LineIndex]) && !Tok.Finalized &&
974 !switchesFormatting(tokenAt(LineIndex)) &&
975 OriginalPrefix[LineIndex] == OriginalPrefix[LineIndex - 1];
976 }
977
978 } // namespace format
979 } // namespace clang
980