1 //===--- Format.cpp - Format C++ code -------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 ///
10 /// \file
11 /// \brief This file implements functions declared in Format.h. This will be
12 /// split into separate files as we go.
13 ///
14 //===----------------------------------------------------------------------===//
15 
16 #include "ContinuationIndenter.h"
17 #include "TokenAnnotator.h"
18 #include "UnwrappedLineFormatter.h"
19 #include "UnwrappedLineParser.h"
20 #include "WhitespaceManager.h"
21 #include "clang/Basic/Diagnostic.h"
22 #include "clang/Basic/DiagnosticOptions.h"
23 #include "clang/Basic/SourceManager.h"
24 #include "clang/Format/Format.h"
25 #include "clang/Lex/Lexer.h"
26 #include "llvm/ADT/STLExtras.h"
27 #include "llvm/Support/Allocator.h"
28 #include "llvm/Support/Debug.h"
29 #include "llvm/Support/Path.h"
30 #include "llvm/Support/YAMLTraits.h"
31 #include <queue>
32 #include <string>
33 
34 #define DEBUG_TYPE "format-formatter"
35 
36 using clang::format::FormatStyle;
37 
38 LLVM_YAML_IS_FLOW_SEQUENCE_VECTOR(std::string)
39 
40 namespace llvm {
41 namespace yaml {
42 template <> struct ScalarEnumerationTraits<FormatStyle::LanguageKind> {
43   static void enumeration(IO &IO, FormatStyle::LanguageKind &Value) {
44     IO.enumCase(Value, "Cpp", FormatStyle::LK_Cpp);
45     IO.enumCase(Value, "Java", FormatStyle::LK_Java);
46     IO.enumCase(Value, "JavaScript", FormatStyle::LK_JavaScript);
47     IO.enumCase(Value, "Proto", FormatStyle::LK_Proto);
48   }
49 };
50 
51 template <> struct ScalarEnumerationTraits<FormatStyle::LanguageStandard> {
52   static void enumeration(IO &IO, FormatStyle::LanguageStandard &Value) {
53     IO.enumCase(Value, "Cpp03", FormatStyle::LS_Cpp03);
54     IO.enumCase(Value, "C++03", FormatStyle::LS_Cpp03);
55     IO.enumCase(Value, "Cpp11", FormatStyle::LS_Cpp11);
56     IO.enumCase(Value, "C++11", FormatStyle::LS_Cpp11);
57     IO.enumCase(Value, "Auto", FormatStyle::LS_Auto);
58   }
59 };
60 
61 template <> struct ScalarEnumerationTraits<FormatStyle::UseTabStyle> {
62   static void enumeration(IO &IO, FormatStyle::UseTabStyle &Value) {
63     IO.enumCase(Value, "Never", FormatStyle::UT_Never);
64     IO.enumCase(Value, "false", FormatStyle::UT_Never);
65     IO.enumCase(Value, "Always", FormatStyle::UT_Always);
66     IO.enumCase(Value, "true", FormatStyle::UT_Always);
67     IO.enumCase(Value, "ForIndentation", FormatStyle::UT_ForIndentation);
68   }
69 };
70 
71 template <> struct ScalarEnumerationTraits<FormatStyle::ShortFunctionStyle> {
72   static void enumeration(IO &IO, FormatStyle::ShortFunctionStyle &Value) {
73     IO.enumCase(Value, "None", FormatStyle::SFS_None);
74     IO.enumCase(Value, "false", FormatStyle::SFS_None);
75     IO.enumCase(Value, "All", FormatStyle::SFS_All);
76     IO.enumCase(Value, "true", FormatStyle::SFS_All);
77     IO.enumCase(Value, "Inline", FormatStyle::SFS_Inline);
78     IO.enumCase(Value, "Empty", FormatStyle::SFS_Empty);
79   }
80 };
81 
82 template <> struct ScalarEnumerationTraits<FormatStyle::BinaryOperatorStyle> {
83   static void enumeration(IO &IO, FormatStyle::BinaryOperatorStyle &Value) {
84     IO.enumCase(Value, "All", FormatStyle::BOS_All);
85     IO.enumCase(Value, "true", FormatStyle::BOS_All);
86     IO.enumCase(Value, "None", FormatStyle::BOS_None);
87     IO.enumCase(Value, "false", FormatStyle::BOS_None);
88     IO.enumCase(Value, "NonAssignment", FormatStyle::BOS_NonAssignment);
89   }
90 };
91 
92 template <> struct ScalarEnumerationTraits<FormatStyle::BraceBreakingStyle> {
93   static void enumeration(IO &IO, FormatStyle::BraceBreakingStyle &Value) {
94     IO.enumCase(Value, "Attach", FormatStyle::BS_Attach);
95     IO.enumCase(Value, "Linux", FormatStyle::BS_Linux);
96     IO.enumCase(Value, "Stroustrup", FormatStyle::BS_Stroustrup);
97     IO.enumCase(Value, "Allman", FormatStyle::BS_Allman);
98     IO.enumCase(Value, "GNU", FormatStyle::BS_GNU);
99   }
100 };
101 
102 template <>
103 struct ScalarEnumerationTraits<FormatStyle::NamespaceIndentationKind> {
104   static void enumeration(IO &IO,
105                           FormatStyle::NamespaceIndentationKind &Value) {
106     IO.enumCase(Value, "None", FormatStyle::NI_None);
107     IO.enumCase(Value, "Inner", FormatStyle::NI_Inner);
108     IO.enumCase(Value, "All", FormatStyle::NI_All);
109   }
110 };
111 
112 template <> struct ScalarEnumerationTraits<FormatStyle::PointerAlignmentStyle> {
113   static void enumeration(IO &IO, FormatStyle::PointerAlignmentStyle &Value) {
114     IO.enumCase(Value, "Middle", FormatStyle::PAS_Middle);
115     IO.enumCase(Value, "Left", FormatStyle::PAS_Left);
116     IO.enumCase(Value, "Right", FormatStyle::PAS_Right);
117 
118     // For backward compatibility.
119     IO.enumCase(Value, "true", FormatStyle::PAS_Left);
120     IO.enumCase(Value, "false", FormatStyle::PAS_Right);
121   }
122 };
123 
124 template <>
125 struct ScalarEnumerationTraits<FormatStyle::SpaceBeforeParensOptions> {
126   static void enumeration(IO &IO,
127                           FormatStyle::SpaceBeforeParensOptions &Value) {
128     IO.enumCase(Value, "Never", FormatStyle::SBPO_Never);
129     IO.enumCase(Value, "ControlStatements",
130                 FormatStyle::SBPO_ControlStatements);
131     IO.enumCase(Value, "Always", FormatStyle::SBPO_Always);
132 
133     // For backward compatibility.
134     IO.enumCase(Value, "false", FormatStyle::SBPO_Never);
135     IO.enumCase(Value, "true", FormatStyle::SBPO_ControlStatements);
136   }
137 };
138 
139 template <> struct MappingTraits<FormatStyle> {
140   static void mapping(IO &IO, FormatStyle &Style) {
141     // When reading, read the language first, we need it for getPredefinedStyle.
142     IO.mapOptional("Language", Style.Language);
143 
144     if (IO.outputting()) {
145       StringRef StylesArray[] = {"LLVM",    "Google", "Chromium",
146                                  "Mozilla", "WebKit", "GNU"};
147       ArrayRef<StringRef> Styles(StylesArray);
148       for (size_t i = 0, e = Styles.size(); i < e; ++i) {
149         StringRef StyleName(Styles[i]);
150         FormatStyle PredefinedStyle;
151         if (getPredefinedStyle(StyleName, Style.Language, &PredefinedStyle) &&
152             Style == PredefinedStyle) {
153           IO.mapOptional("# BasedOnStyle", StyleName);
154           break;
155         }
156       }
157     } else {
158       StringRef BasedOnStyle;
159       IO.mapOptional("BasedOnStyle", BasedOnStyle);
160       if (!BasedOnStyle.empty()) {
161         FormatStyle::LanguageKind OldLanguage = Style.Language;
162         FormatStyle::LanguageKind Language =
163             ((FormatStyle *)IO.getContext())->Language;
164         if (!getPredefinedStyle(BasedOnStyle, Language, &Style)) {
165           IO.setError(Twine("Unknown value for BasedOnStyle: ", BasedOnStyle));
166           return;
167         }
168         Style.Language = OldLanguage;
169       }
170     }
171 
172     IO.mapOptional("AccessModifierOffset", Style.AccessModifierOffset);
173     IO.mapOptional("AlignAfterOpenBracket", Style.AlignAfterOpenBracket);
174     IO.mapOptional("AlignEscapedNewlinesLeft", Style.AlignEscapedNewlinesLeft);
175     IO.mapOptional("AlignOperands", Style.AlignOperands);
176     IO.mapOptional("AlignTrailingComments", Style.AlignTrailingComments);
177     IO.mapOptional("AllowAllParametersOfDeclarationOnNextLine",
178                    Style.AllowAllParametersOfDeclarationOnNextLine);
179     IO.mapOptional("AllowShortBlocksOnASingleLine",
180                    Style.AllowShortBlocksOnASingleLine);
181     IO.mapOptional("AllowShortCaseLabelsOnASingleLine",
182                    Style.AllowShortCaseLabelsOnASingleLine);
183     IO.mapOptional("AllowShortIfStatementsOnASingleLine",
184                    Style.AllowShortIfStatementsOnASingleLine);
185     IO.mapOptional("AllowShortLoopsOnASingleLine",
186                    Style.AllowShortLoopsOnASingleLine);
187     IO.mapOptional("AllowShortFunctionsOnASingleLine",
188                    Style.AllowShortFunctionsOnASingleLine);
189     IO.mapOptional("AlwaysBreakAfterDefinitionReturnType",
190                    Style.AlwaysBreakAfterDefinitionReturnType);
191     IO.mapOptional("AlwaysBreakTemplateDeclarations",
192                    Style.AlwaysBreakTemplateDeclarations);
193     IO.mapOptional("AlwaysBreakBeforeMultilineStrings",
194                    Style.AlwaysBreakBeforeMultilineStrings);
195     IO.mapOptional("BreakBeforeBinaryOperators",
196                    Style.BreakBeforeBinaryOperators);
197     IO.mapOptional("BreakBeforeTernaryOperators",
198                    Style.BreakBeforeTernaryOperators);
199     IO.mapOptional("BreakConstructorInitializersBeforeComma",
200                    Style.BreakConstructorInitializersBeforeComma);
201     IO.mapOptional("BinPackParameters", Style.BinPackParameters);
202     IO.mapOptional("BinPackArguments", Style.BinPackArguments);
203     IO.mapOptional("ColumnLimit", Style.ColumnLimit);
204     IO.mapOptional("ConstructorInitializerAllOnOneLineOrOnePerLine",
205                    Style.ConstructorInitializerAllOnOneLineOrOnePerLine);
206     IO.mapOptional("ConstructorInitializerIndentWidth",
207                    Style.ConstructorInitializerIndentWidth);
208     IO.mapOptional("DerivePointerAlignment", Style.DerivePointerAlignment);
209     IO.mapOptional("ExperimentalAutoDetectBinPacking",
210                    Style.ExperimentalAutoDetectBinPacking);
211     IO.mapOptional("IndentCaseLabels", Style.IndentCaseLabels);
212     IO.mapOptional("IndentWrappedFunctionNames",
213                    Style.IndentWrappedFunctionNames);
214     IO.mapOptional("IndentFunctionDeclarationAfterType",
215                    Style.IndentWrappedFunctionNames);
216     IO.mapOptional("MaxEmptyLinesToKeep", Style.MaxEmptyLinesToKeep);
217     IO.mapOptional("KeepEmptyLinesAtTheStartOfBlocks",
218                    Style.KeepEmptyLinesAtTheStartOfBlocks);
219     IO.mapOptional("NamespaceIndentation", Style.NamespaceIndentation);
220     IO.mapOptional("ObjCBlockIndentWidth", Style.ObjCBlockIndentWidth);
221     IO.mapOptional("ObjCSpaceAfterProperty", Style.ObjCSpaceAfterProperty);
222     IO.mapOptional("ObjCSpaceBeforeProtocolList",
223                    Style.ObjCSpaceBeforeProtocolList);
224     IO.mapOptional("PenaltyBreakBeforeFirstCallParameter",
225                    Style.PenaltyBreakBeforeFirstCallParameter);
226     IO.mapOptional("PenaltyBreakComment", Style.PenaltyBreakComment);
227     IO.mapOptional("PenaltyBreakString", Style.PenaltyBreakString);
228     IO.mapOptional("PenaltyBreakFirstLessLess",
229                    Style.PenaltyBreakFirstLessLess);
230     IO.mapOptional("PenaltyExcessCharacter", Style.PenaltyExcessCharacter);
231     IO.mapOptional("PenaltyReturnTypeOnItsOwnLine",
232                    Style.PenaltyReturnTypeOnItsOwnLine);
233     IO.mapOptional("PointerAlignment", Style.PointerAlignment);
234     IO.mapOptional("SpacesBeforeTrailingComments",
235                    Style.SpacesBeforeTrailingComments);
236     IO.mapOptional("Cpp11BracedListStyle", Style.Cpp11BracedListStyle);
237     IO.mapOptional("Standard", Style.Standard);
238     IO.mapOptional("IndentWidth", Style.IndentWidth);
239     IO.mapOptional("TabWidth", Style.TabWidth);
240     IO.mapOptional("UseTab", Style.UseTab);
241     IO.mapOptional("BreakBeforeBraces", Style.BreakBeforeBraces);
242     IO.mapOptional("SpacesInParentheses", Style.SpacesInParentheses);
243     IO.mapOptional("SpacesInSquareBrackets", Style.SpacesInSquareBrackets);
244     IO.mapOptional("SpacesInAngles", Style.SpacesInAngles);
245     IO.mapOptional("SpaceInEmptyParentheses", Style.SpaceInEmptyParentheses);
246     IO.mapOptional("SpacesInCStyleCastParentheses",
247                    Style.SpacesInCStyleCastParentheses);
248     IO.mapOptional("SpaceAfterCStyleCast", Style.SpaceAfterCStyleCast);
249     IO.mapOptional("SpacesInContainerLiterals",
250                    Style.SpacesInContainerLiterals);
251     IO.mapOptional("SpaceBeforeAssignmentOperators",
252                    Style.SpaceBeforeAssignmentOperators);
253     IO.mapOptional("ContinuationIndentWidth", Style.ContinuationIndentWidth);
254     IO.mapOptional("CommentPragmas", Style.CommentPragmas);
255     IO.mapOptional("ForEachMacros", Style.ForEachMacros);
256 
257     // For backward compatibility.
258     if (!IO.outputting()) {
259       IO.mapOptional("SpaceAfterControlStatementKeyword",
260                      Style.SpaceBeforeParens);
261       IO.mapOptional("PointerBindsToType", Style.PointerAlignment);
262       IO.mapOptional("DerivePointerBinding", Style.DerivePointerAlignment);
263     }
264     IO.mapOptional("SpaceBeforeParens", Style.SpaceBeforeParens);
265     IO.mapOptional("DisableFormat", Style.DisableFormat);
266   }
267 };
268 
269 // Allows to read vector<FormatStyle> while keeping default values.
270 // IO.getContext() should contain a pointer to the FormatStyle structure, that
271 // will be used to get default values for missing keys.
272 // If the first element has no Language specified, it will be treated as the
273 // default one for the following elements.
274 template <> struct DocumentListTraits<std::vector<FormatStyle>> {
275   static size_t size(IO &IO, std::vector<FormatStyle> &Seq) {
276     return Seq.size();
277   }
278   static FormatStyle &element(IO &IO, std::vector<FormatStyle> &Seq,
279                               size_t Index) {
280     if (Index >= Seq.size()) {
281       assert(Index == Seq.size());
282       FormatStyle Template;
283       if (Seq.size() > 0 && Seq[0].Language == FormatStyle::LK_None) {
284         Template = Seq[0];
285       } else {
286         Template = *((const FormatStyle *)IO.getContext());
287         Template.Language = FormatStyle::LK_None;
288       }
289       Seq.resize(Index + 1, Template);
290     }
291     return Seq[Index];
292   }
293 };
294 }
295 }
296 
297 namespace clang {
298 namespace format {
299 
300 const std::error_category &getParseCategory() {
301   static ParseErrorCategory C;
302   return C;
303 }
304 std::error_code make_error_code(ParseError e) {
305   return std::error_code(static_cast<int>(e), getParseCategory());
306 }
307 
308 const char *ParseErrorCategory::name() const LLVM_NOEXCEPT {
309   return "clang-format.parse_error";
310 }
311 
312 std::string ParseErrorCategory::message(int EV) const {
313   switch (static_cast<ParseError>(EV)) {
314   case ParseError::Success:
315     return "Success";
316   case ParseError::Error:
317     return "Invalid argument";
318   case ParseError::Unsuitable:
319     return "Unsuitable";
320   }
321   llvm_unreachable("unexpected parse error");
322 }
323 
324 FormatStyle getLLVMStyle() {
325   FormatStyle LLVMStyle;
326   LLVMStyle.Language = FormatStyle::LK_Cpp;
327   LLVMStyle.AccessModifierOffset = -2;
328   LLVMStyle.AlignEscapedNewlinesLeft = false;
329   LLVMStyle.AlignAfterOpenBracket = true;
330   LLVMStyle.AlignOperands = true;
331   LLVMStyle.AlignTrailingComments = true;
332   LLVMStyle.AllowAllParametersOfDeclarationOnNextLine = true;
333   LLVMStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_All;
334   LLVMStyle.AllowShortBlocksOnASingleLine = false;
335   LLVMStyle.AllowShortCaseLabelsOnASingleLine = false;
336   LLVMStyle.AllowShortIfStatementsOnASingleLine = false;
337   LLVMStyle.AllowShortLoopsOnASingleLine = false;
338   LLVMStyle.AlwaysBreakAfterDefinitionReturnType = false;
339   LLVMStyle.AlwaysBreakBeforeMultilineStrings = false;
340   LLVMStyle.AlwaysBreakTemplateDeclarations = false;
341   LLVMStyle.BinPackParameters = true;
342   LLVMStyle.BinPackArguments = true;
343   LLVMStyle.BreakBeforeBinaryOperators = FormatStyle::BOS_None;
344   LLVMStyle.BreakBeforeTernaryOperators = true;
345   LLVMStyle.BreakBeforeBraces = FormatStyle::BS_Attach;
346   LLVMStyle.BreakConstructorInitializersBeforeComma = false;
347   LLVMStyle.ColumnLimit = 80;
348   LLVMStyle.CommentPragmas = "^ IWYU pragma:";
349   LLVMStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = false;
350   LLVMStyle.ConstructorInitializerIndentWidth = 4;
351   LLVMStyle.ContinuationIndentWidth = 4;
352   LLVMStyle.Cpp11BracedListStyle = true;
353   LLVMStyle.DerivePointerAlignment = false;
354   LLVMStyle.ExperimentalAutoDetectBinPacking = false;
355   LLVMStyle.ForEachMacros.push_back("foreach");
356   LLVMStyle.ForEachMacros.push_back("Q_FOREACH");
357   LLVMStyle.ForEachMacros.push_back("BOOST_FOREACH");
358   LLVMStyle.IndentCaseLabels = false;
359   LLVMStyle.IndentWrappedFunctionNames = false;
360   LLVMStyle.IndentWidth = 2;
361   LLVMStyle.TabWidth = 8;
362   LLVMStyle.MaxEmptyLinesToKeep = 1;
363   LLVMStyle.KeepEmptyLinesAtTheStartOfBlocks = true;
364   LLVMStyle.NamespaceIndentation = FormatStyle::NI_None;
365   LLVMStyle.ObjCBlockIndentWidth = 2;
366   LLVMStyle.ObjCSpaceAfterProperty = false;
367   LLVMStyle.ObjCSpaceBeforeProtocolList = true;
368   LLVMStyle.PointerAlignment = FormatStyle::PAS_Right;
369   LLVMStyle.SpacesBeforeTrailingComments = 1;
370   LLVMStyle.Standard = FormatStyle::LS_Cpp11;
371   LLVMStyle.UseTab = FormatStyle::UT_Never;
372   LLVMStyle.SpacesInParentheses = false;
373   LLVMStyle.SpacesInSquareBrackets = false;
374   LLVMStyle.SpaceInEmptyParentheses = false;
375   LLVMStyle.SpacesInContainerLiterals = true;
376   LLVMStyle.SpacesInCStyleCastParentheses = false;
377   LLVMStyle.SpaceAfterCStyleCast = false;
378   LLVMStyle.SpaceBeforeParens = FormatStyle::SBPO_ControlStatements;
379   LLVMStyle.SpaceBeforeAssignmentOperators = true;
380   LLVMStyle.SpacesInAngles = false;
381 
382   LLVMStyle.PenaltyBreakComment = 300;
383   LLVMStyle.PenaltyBreakFirstLessLess = 120;
384   LLVMStyle.PenaltyBreakString = 1000;
385   LLVMStyle.PenaltyExcessCharacter = 1000000;
386   LLVMStyle.PenaltyReturnTypeOnItsOwnLine = 60;
387   LLVMStyle.PenaltyBreakBeforeFirstCallParameter = 19;
388 
389   LLVMStyle.DisableFormat = false;
390 
391   return LLVMStyle;
392 }
393 
394 FormatStyle getGoogleStyle(FormatStyle::LanguageKind Language) {
395   FormatStyle GoogleStyle = getLLVMStyle();
396   GoogleStyle.Language = Language;
397 
398   GoogleStyle.AccessModifierOffset = -1;
399   GoogleStyle.AlignEscapedNewlinesLeft = true;
400   GoogleStyle.AllowShortIfStatementsOnASingleLine = true;
401   GoogleStyle.AllowShortLoopsOnASingleLine = true;
402   GoogleStyle.AlwaysBreakBeforeMultilineStrings = true;
403   GoogleStyle.AlwaysBreakTemplateDeclarations = true;
404   GoogleStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = true;
405   GoogleStyle.DerivePointerAlignment = true;
406   GoogleStyle.IndentCaseLabels = true;
407   GoogleStyle.KeepEmptyLinesAtTheStartOfBlocks = false;
408   GoogleStyle.ObjCSpaceAfterProperty = false;
409   GoogleStyle.ObjCSpaceBeforeProtocolList = false;
410   GoogleStyle.PointerAlignment = FormatStyle::PAS_Left;
411   GoogleStyle.SpacesBeforeTrailingComments = 2;
412   GoogleStyle.Standard = FormatStyle::LS_Auto;
413 
414   GoogleStyle.PenaltyReturnTypeOnItsOwnLine = 200;
415   GoogleStyle.PenaltyBreakBeforeFirstCallParameter = 1;
416 
417   if (Language == FormatStyle::LK_Java) {
418     GoogleStyle.AlignAfterOpenBracket = false;
419     GoogleStyle.AlignOperands = false;
420     GoogleStyle.AlignTrailingComments = false;
421     GoogleStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_Empty;
422     GoogleStyle.AllowShortIfStatementsOnASingleLine = false;
423     GoogleStyle.AlwaysBreakBeforeMultilineStrings = false;
424     GoogleStyle.BreakBeforeBinaryOperators = FormatStyle::BOS_NonAssignment;
425     GoogleStyle.ColumnLimit = 100;
426     GoogleStyle.SpaceAfterCStyleCast = true;
427     GoogleStyle.SpacesBeforeTrailingComments = 1;
428   } else if (Language == FormatStyle::LK_JavaScript) {
429     GoogleStyle.BreakBeforeTernaryOperators = false;
430     GoogleStyle.MaxEmptyLinesToKeep = 3;
431     GoogleStyle.SpacesInContainerLiterals = false;
432     GoogleStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_Inline;
433     GoogleStyle.AlwaysBreakBeforeMultilineStrings = false;
434   } else if (Language == FormatStyle::LK_Proto) {
435     GoogleStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_None;
436     GoogleStyle.SpacesInContainerLiterals = false;
437   }
438 
439   return GoogleStyle;
440 }
441 
442 FormatStyle getChromiumStyle(FormatStyle::LanguageKind Language) {
443   FormatStyle ChromiumStyle = getGoogleStyle(Language);
444   if (Language == FormatStyle::LK_Java) {
445     ChromiumStyle.AllowShortIfStatementsOnASingleLine = true;
446     ChromiumStyle.IndentWidth = 4;
447     ChromiumStyle.ContinuationIndentWidth = 8;
448   } else {
449     ChromiumStyle.AllowAllParametersOfDeclarationOnNextLine = false;
450     ChromiumStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_Inline;
451     ChromiumStyle.AllowShortIfStatementsOnASingleLine = false;
452     ChromiumStyle.AllowShortLoopsOnASingleLine = false;
453     ChromiumStyle.BinPackParameters = false;
454     ChromiumStyle.DerivePointerAlignment = false;
455   }
456   return ChromiumStyle;
457 }
458 
459 FormatStyle getMozillaStyle() {
460   FormatStyle MozillaStyle = getLLVMStyle();
461   MozillaStyle.AllowAllParametersOfDeclarationOnNextLine = false;
462   MozillaStyle.Cpp11BracedListStyle = false;
463   MozillaStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = true;
464   MozillaStyle.DerivePointerAlignment = true;
465   MozillaStyle.IndentCaseLabels = true;
466   MozillaStyle.ObjCSpaceAfterProperty = true;
467   MozillaStyle.ObjCSpaceBeforeProtocolList = false;
468   MozillaStyle.PenaltyReturnTypeOnItsOwnLine = 200;
469   MozillaStyle.PointerAlignment = FormatStyle::PAS_Left;
470   MozillaStyle.Standard = FormatStyle::LS_Cpp03;
471   return MozillaStyle;
472 }
473 
474 FormatStyle getWebKitStyle() {
475   FormatStyle Style = getLLVMStyle();
476   Style.AccessModifierOffset = -4;
477   Style.AlignAfterOpenBracket = false;
478   Style.AlignOperands = false;
479   Style.AlignTrailingComments = false;
480   Style.BreakBeforeBinaryOperators = FormatStyle::BOS_All;
481   Style.BreakBeforeBraces = FormatStyle::BS_Stroustrup;
482   Style.BreakConstructorInitializersBeforeComma = true;
483   Style.Cpp11BracedListStyle = false;
484   Style.ColumnLimit = 0;
485   Style.IndentWidth = 4;
486   Style.NamespaceIndentation = FormatStyle::NI_Inner;
487   Style.ObjCBlockIndentWidth = 4;
488   Style.ObjCSpaceAfterProperty = true;
489   Style.PointerAlignment = FormatStyle::PAS_Left;
490   Style.Standard = FormatStyle::LS_Cpp03;
491   return Style;
492 }
493 
494 FormatStyle getGNUStyle() {
495   FormatStyle Style = getLLVMStyle();
496   Style.AlwaysBreakAfterDefinitionReturnType = true;
497   Style.BreakBeforeBinaryOperators = FormatStyle::BOS_All;
498   Style.BreakBeforeBraces = FormatStyle::BS_GNU;
499   Style.BreakBeforeTernaryOperators = true;
500   Style.Cpp11BracedListStyle = false;
501   Style.ColumnLimit = 79;
502   Style.SpaceBeforeParens = FormatStyle::SBPO_Always;
503   Style.Standard = FormatStyle::LS_Cpp03;
504   return Style;
505 }
506 
507 FormatStyle getNoStyle() {
508   FormatStyle NoStyle = getLLVMStyle();
509   NoStyle.DisableFormat = true;
510   return NoStyle;
511 }
512 
513 bool getPredefinedStyle(StringRef Name, FormatStyle::LanguageKind Language,
514                         FormatStyle *Style) {
515   if (Name.equals_lower("llvm")) {
516     *Style = getLLVMStyle();
517   } else if (Name.equals_lower("chromium")) {
518     *Style = getChromiumStyle(Language);
519   } else if (Name.equals_lower("mozilla")) {
520     *Style = getMozillaStyle();
521   } else if (Name.equals_lower("google")) {
522     *Style = getGoogleStyle(Language);
523   } else if (Name.equals_lower("webkit")) {
524     *Style = getWebKitStyle();
525   } else if (Name.equals_lower("gnu")) {
526     *Style = getGNUStyle();
527   } else if (Name.equals_lower("none")) {
528     *Style = getNoStyle();
529   } else {
530     return false;
531   }
532 
533   Style->Language = Language;
534   return true;
535 }
536 
537 std::error_code parseConfiguration(StringRef Text, FormatStyle *Style) {
538   assert(Style);
539   FormatStyle::LanguageKind Language = Style->Language;
540   assert(Language != FormatStyle::LK_None);
541   if (Text.trim().empty())
542     return make_error_code(ParseError::Error);
543 
544   std::vector<FormatStyle> Styles;
545   llvm::yaml::Input Input(Text);
546   // DocumentListTraits<vector<FormatStyle>> uses the context to get default
547   // values for the fields, keys for which are missing from the configuration.
548   // Mapping also uses the context to get the language to find the correct
549   // base style.
550   Input.setContext(Style);
551   Input >> Styles;
552   if (Input.error())
553     return Input.error();
554 
555   for (unsigned i = 0; i < Styles.size(); ++i) {
556     // Ensures that only the first configuration can skip the Language option.
557     if (Styles[i].Language == FormatStyle::LK_None && i != 0)
558       return make_error_code(ParseError::Error);
559     // Ensure that each language is configured at most once.
560     for (unsigned j = 0; j < i; ++j) {
561       if (Styles[i].Language == Styles[j].Language) {
562         DEBUG(llvm::dbgs()
563               << "Duplicate languages in the config file on positions " << j
564               << " and " << i << "\n");
565         return make_error_code(ParseError::Error);
566       }
567     }
568   }
569   // Look for a suitable configuration starting from the end, so we can
570   // find the configuration for the specific language first, and the default
571   // configuration (which can only be at slot 0) after it.
572   for (int i = Styles.size() - 1; i >= 0; --i) {
573     if (Styles[i].Language == Language ||
574         Styles[i].Language == FormatStyle::LK_None) {
575       *Style = Styles[i];
576       Style->Language = Language;
577       return make_error_code(ParseError::Success);
578     }
579   }
580   return make_error_code(ParseError::Unsuitable);
581 }
582 
583 std::string configurationAsText(const FormatStyle &Style) {
584   std::string Text;
585   llvm::raw_string_ostream Stream(Text);
586   llvm::yaml::Output Output(Stream);
587   // We use the same mapping method for input and output, so we need a non-const
588   // reference here.
589   FormatStyle NonConstStyle = Style;
590   Output << NonConstStyle;
591   return Stream.str();
592 }
593 
594 namespace {
595 
596 class FormatTokenLexer {
597 public:
598   FormatTokenLexer(SourceManager &SourceMgr, FileID ID, FormatStyle &Style,
599                    encoding::Encoding Encoding)
600       : FormatTok(nullptr), IsFirstToken(true), GreaterStashed(false),
601         LessStashed(false), Column(0), TrailingWhitespace(0),
602         SourceMgr(SourceMgr), ID(ID), Style(Style),
603         IdentTable(getFormattingLangOpts(Style)), Keywords(IdentTable),
604         Encoding(Encoding), FirstInLineIndex(0), FormattingDisabled(false) {
605     Lex.reset(new Lexer(ID, SourceMgr.getBuffer(ID), SourceMgr,
606                         getFormattingLangOpts(Style)));
607     Lex->SetKeepWhitespaceMode(true);
608 
609     for (const std::string &ForEachMacro : Style.ForEachMacros)
610       ForEachMacros.push_back(&IdentTable.get(ForEachMacro));
611     std::sort(ForEachMacros.begin(), ForEachMacros.end());
612   }
613 
614   ArrayRef<FormatToken *> lex() {
615     assert(Tokens.empty());
616     assert(FirstInLineIndex == 0);
617     do {
618       Tokens.push_back(getNextToken());
619       tryMergePreviousTokens();
620       if (Tokens.back()->NewlinesBefore > 0)
621         FirstInLineIndex = Tokens.size() - 1;
622     } while (Tokens.back()->Tok.isNot(tok::eof));
623     return Tokens;
624   }
625 
626   const AdditionalKeywords &getKeywords() { return Keywords; }
627 
628 private:
629   void tryMergePreviousTokens() {
630     if (tryMerge_TMacro())
631       return;
632     if (tryMergeConflictMarkers())
633       return;
634     if (tryMergeLessLess())
635       return;
636 
637     if (Style.Language == FormatStyle::LK_JavaScript) {
638       if (tryMergeJSRegexLiteral())
639         return;
640       if (tryMergeEscapeSequence())
641         return;
642 
643       static tok::TokenKind JSIdentity[] = {tok::equalequal, tok::equal};
644       static tok::TokenKind JSNotIdentity[] = {tok::exclaimequal, tok::equal};
645       static tok::TokenKind JSShiftEqual[] = {tok::greater, tok::greater,
646                                               tok::greaterequal};
647       static tok::TokenKind JSRightArrow[] = {tok::equal, tok::greater};
648       // FIXME: We probably need to change token type to mimic operator with the
649       // correct priority.
650       if (tryMergeTokens(JSIdentity))
651         return;
652       if (tryMergeTokens(JSNotIdentity))
653         return;
654       if (tryMergeTokens(JSShiftEqual))
655         return;
656       if (tryMergeTokens(JSRightArrow))
657         return;
658     }
659   }
660 
661   bool tryMergeLessLess() {
662     // Merge X,less,less,Y into X,lessless,Y unless X or Y is less.
663     if (Tokens.size() < 4) {
664       // Merge <,<,eof to <<,eof
665       if (Tokens.back()->Tok.isNot(tok::eof))
666         return false;
667 
668       auto &eof = Tokens.back();
669       Tokens.pop_back();
670       bool LessLessMerged;
671       if ((LessLessMerged = tryMergeTokens({tok::less, tok::less})))
672         Tokens.back()->Tok.setKind(tok::lessless);
673       Tokens.push_back(eof);
674       return LessLessMerged;
675     }
676 
677     auto First = Tokens.end() - 4;
678     if (First[3]->is(tok::less) || First[2]->isNot(tok::less) ||
679         First[1]->isNot(tok::less) || First[0]->is(tok::less))
680       return false;
681 
682     // Only merge if there currently is no whitespace between the two "<".
683     if (First[2]->WhitespaceRange.getBegin() !=
684         First[2]->WhitespaceRange.getEnd())
685       return false;
686 
687     First[1]->Tok.setKind(tok::lessless);
688     First[1]->TokenText = "<<";
689     First[1]->ColumnWidth += 1;
690     Tokens.erase(Tokens.end() - 2);
691     return true;
692   }
693 
694   bool tryMergeTokens(ArrayRef<tok::TokenKind> Kinds) {
695     if (Tokens.size() < Kinds.size())
696       return false;
697 
698     SmallVectorImpl<FormatToken *>::const_iterator First =
699         Tokens.end() - Kinds.size();
700     if (!First[0]->is(Kinds[0]))
701       return false;
702     unsigned AddLength = 0;
703     for (unsigned i = 1; i < Kinds.size(); ++i) {
704       if (!First[i]->is(Kinds[i]) ||
705           First[i]->WhitespaceRange.getBegin() !=
706               First[i]->WhitespaceRange.getEnd())
707         return false;
708       AddLength += First[i]->TokenText.size();
709     }
710     Tokens.resize(Tokens.size() - Kinds.size() + 1);
711     First[0]->TokenText = StringRef(First[0]->TokenText.data(),
712                                     First[0]->TokenText.size() + AddLength);
713     First[0]->ColumnWidth += AddLength;
714     return true;
715   }
716 
717   // Tries to merge an escape sequence, i.e. a "\\" and the following
718   // character. Use e.g. inside JavaScript regex literals.
719   bool tryMergeEscapeSequence() {
720     if (Tokens.size() < 2)
721       return false;
722     FormatToken *Previous = Tokens[Tokens.size() - 2];
723     if (Previous->isNot(tok::unknown) || Previous->TokenText != "\\")
724       return false;
725     ++Previous->ColumnWidth;
726     StringRef Text = Previous->TokenText;
727     Previous->TokenText = StringRef(Text.data(), Text.size() + 1);
728     resetLexer(SourceMgr.getFileOffset(Tokens.back()->Tok.getLocation()) + 1);
729     Tokens.resize(Tokens.size() - 1);
730     Column = Previous->OriginalColumn + Previous->ColumnWidth;
731     return true;
732   }
733 
734   // Try to determine whether the current token ends a JavaScript regex literal.
735   // We heuristically assume that this is a regex literal if we find two
736   // unescaped slashes on a line and the token before the first slash is one of
737   // "(;,{}![:?", a binary operator or 'return', as those cannot be followed by
738   // a division.
739   bool tryMergeJSRegexLiteral() {
740     if (Tokens.size() < 2)
741       return false;
742     // If a regex literal ends in "\//", this gets represented by an unknown
743     // token "\" and a comment.
744     bool MightEndWithEscapedSlash =
745         Tokens.back()->is(tok::comment) &&
746         Tokens.back()->TokenText.startswith("//") &&
747         Tokens[Tokens.size() - 2]->TokenText == "\\";
748     if (!MightEndWithEscapedSlash &&
749         (Tokens.back()->isNot(tok::slash) ||
750          (Tokens[Tokens.size() - 2]->is(tok::unknown) &&
751           Tokens[Tokens.size() - 2]->TokenText == "\\")))
752       return false;
753     unsigned TokenCount = 0;
754     unsigned LastColumn = Tokens.back()->OriginalColumn;
755     for (auto I = Tokens.rbegin() + 1, E = Tokens.rend(); I != E; ++I) {
756       ++TokenCount;
757       if (I[0]->is(tok::slash) && I + 1 != E &&
758           (I[1]->isOneOf(tok::l_paren, tok::semi, tok::l_brace, tok::r_brace,
759                          tok::exclaim, tok::l_square, tok::colon, tok::comma,
760                          tok::question, tok::kw_return) ||
761            I[1]->isBinaryOperator())) {
762         if (MightEndWithEscapedSlash) {
763           // This regex literal ends in '\//'. Skip past the '//' of the last
764           // token and re-start lexing from there.
765           SourceLocation Loc = Tokens.back()->Tok.getLocation();
766           resetLexer(SourceMgr.getFileOffset(Loc) + 2);
767         }
768         Tokens.resize(Tokens.size() - TokenCount);
769         Tokens.back()->Tok.setKind(tok::unknown);
770         Tokens.back()->Type = TT_RegexLiteral;
771         Tokens.back()->ColumnWidth += LastColumn - I[0]->OriginalColumn;
772         return true;
773       }
774 
775       // There can't be a newline inside a regex literal.
776       if (I[0]->NewlinesBefore > 0)
777         return false;
778     }
779     return false;
780   }
781 
782   bool tryMerge_TMacro() {
783     if (Tokens.size() < 4)
784       return false;
785     FormatToken *Last = Tokens.back();
786     if (!Last->is(tok::r_paren))
787       return false;
788 
789     FormatToken *String = Tokens[Tokens.size() - 2];
790     if (!String->is(tok::string_literal) || String->IsMultiline)
791       return false;
792 
793     if (!Tokens[Tokens.size() - 3]->is(tok::l_paren))
794       return false;
795 
796     FormatToken *Macro = Tokens[Tokens.size() - 4];
797     if (Macro->TokenText != "_T")
798       return false;
799 
800     const char *Start = Macro->TokenText.data();
801     const char *End = Last->TokenText.data() + Last->TokenText.size();
802     String->TokenText = StringRef(Start, End - Start);
803     String->IsFirst = Macro->IsFirst;
804     String->LastNewlineOffset = Macro->LastNewlineOffset;
805     String->WhitespaceRange = Macro->WhitespaceRange;
806     String->OriginalColumn = Macro->OriginalColumn;
807     String->ColumnWidth = encoding::columnWidthWithTabs(
808         String->TokenText, String->OriginalColumn, Style.TabWidth, Encoding);
809 
810     Tokens.pop_back();
811     Tokens.pop_back();
812     Tokens.pop_back();
813     Tokens.back() = String;
814     return true;
815   }
816 
817   bool tryMergeConflictMarkers() {
818     if (Tokens.back()->NewlinesBefore == 0 && Tokens.back()->isNot(tok::eof))
819       return false;
820 
821     // Conflict lines look like:
822     // <marker> <text from the vcs>
823     // For example:
824     // >>>>>>> /file/in/file/system at revision 1234
825     //
826     // We merge all tokens in a line that starts with a conflict marker
827     // into a single token with a special token type that the unwrapped line
828     // parser will use to correctly rebuild the underlying code.
829 
830     FileID ID;
831     // Get the position of the first token in the line.
832     unsigned FirstInLineOffset;
833     std::tie(ID, FirstInLineOffset) = SourceMgr.getDecomposedLoc(
834         Tokens[FirstInLineIndex]->getStartOfNonWhitespace());
835     StringRef Buffer = SourceMgr.getBuffer(ID)->getBuffer();
836     // Calculate the offset of the start of the current line.
837     auto LineOffset = Buffer.rfind('\n', FirstInLineOffset);
838     if (LineOffset == StringRef::npos) {
839       LineOffset = 0;
840     } else {
841       ++LineOffset;
842     }
843 
844     auto FirstSpace = Buffer.find_first_of(" \n", LineOffset);
845     StringRef LineStart;
846     if (FirstSpace == StringRef::npos) {
847       LineStart = Buffer.substr(LineOffset);
848     } else {
849       LineStart = Buffer.substr(LineOffset, FirstSpace - LineOffset);
850     }
851 
852     TokenType Type = TT_Unknown;
853     if (LineStart == "<<<<<<<" || LineStart == ">>>>") {
854       Type = TT_ConflictStart;
855     } else if (LineStart == "|||||||" || LineStart == "=======" ||
856                LineStart == "====") {
857       Type = TT_ConflictAlternative;
858     } else if (LineStart == ">>>>>>>" || LineStart == "<<<<") {
859       Type = TT_ConflictEnd;
860     }
861 
862     if (Type != TT_Unknown) {
863       FormatToken *Next = Tokens.back();
864 
865       Tokens.resize(FirstInLineIndex + 1);
866       // We do not need to build a complete token here, as we will skip it
867       // during parsing anyway (as we must not touch whitespace around conflict
868       // markers).
869       Tokens.back()->Type = Type;
870       Tokens.back()->Tok.setKind(tok::kw___unknown_anytype);
871 
872       Tokens.push_back(Next);
873       return true;
874     }
875 
876     return false;
877   }
878 
879   FormatToken *getStashedToken() {
880     // Create a synthesized second '>' or '<' token.
881     Token Tok = FormatTok->Tok;
882     StringRef TokenText = FormatTok->TokenText;
883 
884     unsigned OriginalColumn = FormatTok->OriginalColumn;
885     FormatTok = new (Allocator.Allocate()) FormatToken;
886     FormatTok->Tok = Tok;
887     SourceLocation TokLocation =
888         FormatTok->Tok.getLocation().getLocWithOffset(1);
889     FormatTok->WhitespaceRange = SourceRange(TokLocation, TokLocation);
890     FormatTok->TokenText = TokenText;
891     FormatTok->ColumnWidth = 1;
892     FormatTok->OriginalColumn = OriginalColumn;
893     return FormatTok;
894   }
895 
896   FormatToken *getNextToken() {
897     if (GreaterStashed) {
898       GreaterStashed = false;
899       return getStashedToken();
900     }
901     if (LessStashed) {
902       LessStashed = false;
903       return getStashedToken();
904     }
905 
906     FormatTok = new (Allocator.Allocate()) FormatToken;
907     readRawToken(*FormatTok);
908     SourceLocation WhitespaceStart =
909         FormatTok->Tok.getLocation().getLocWithOffset(-TrailingWhitespace);
910     FormatTok->IsFirst = IsFirstToken;
911     IsFirstToken = false;
912 
913     // Consume and record whitespace until we find a significant token.
914     unsigned WhitespaceLength = TrailingWhitespace;
915     while (FormatTok->Tok.is(tok::unknown)) {
916       for (int i = 0, e = FormatTok->TokenText.size(); i != e; ++i) {
917         switch (FormatTok->TokenText[i]) {
918         case '\n':
919           ++FormatTok->NewlinesBefore;
920           // FIXME: This is technically incorrect, as it could also
921           // be a literal backslash at the end of the line.
922           if (i == 0 || (FormatTok->TokenText[i - 1] != '\\' &&
923                          (FormatTok->TokenText[i - 1] != '\r' || i == 1 ||
924                           FormatTok->TokenText[i - 2] != '\\')))
925             FormatTok->HasUnescapedNewline = true;
926           FormatTok->LastNewlineOffset = WhitespaceLength + i + 1;
927           Column = 0;
928           break;
929         case '\r':
930           FormatTok->LastNewlineOffset = WhitespaceLength + i + 1;
931           Column = 0;
932           break;
933         case '\f':
934         case '\v':
935           Column = 0;
936           break;
937         case ' ':
938           ++Column;
939           break;
940         case '\t':
941           Column += Style.TabWidth - Column % Style.TabWidth;
942           break;
943         case '\\':
944           if (i + 1 == e || (FormatTok->TokenText[i + 1] != '\r' &&
945                              FormatTok->TokenText[i + 1] != '\n'))
946             FormatTok->Type = TT_ImplicitStringLiteral;
947           break;
948         default:
949           FormatTok->Type = TT_ImplicitStringLiteral;
950           ++Column;
951           break;
952         }
953       }
954 
955       if (FormatTok->is(TT_ImplicitStringLiteral))
956         break;
957       WhitespaceLength += FormatTok->Tok.getLength();
958 
959       readRawToken(*FormatTok);
960     }
961 
962     // In case the token starts with escaped newlines, we want to
963     // take them into account as whitespace - this pattern is quite frequent
964     // in macro definitions.
965     // FIXME: Add a more explicit test.
966     while (FormatTok->TokenText.size() > 1 && FormatTok->TokenText[0] == '\\' &&
967            FormatTok->TokenText[1] == '\n') {
968       ++FormatTok->NewlinesBefore;
969       WhitespaceLength += 2;
970       Column = 0;
971       FormatTok->TokenText = FormatTok->TokenText.substr(2);
972     }
973 
974     FormatTok->WhitespaceRange = SourceRange(
975         WhitespaceStart, WhitespaceStart.getLocWithOffset(WhitespaceLength));
976 
977     FormatTok->OriginalColumn = Column;
978 
979     TrailingWhitespace = 0;
980     if (FormatTok->Tok.is(tok::comment)) {
981       // FIXME: Add the trimmed whitespace to Column.
982       StringRef UntrimmedText = FormatTok->TokenText;
983       FormatTok->TokenText = FormatTok->TokenText.rtrim(" \t\v\f");
984       TrailingWhitespace = UntrimmedText.size() - FormatTok->TokenText.size();
985     } else if (FormatTok->Tok.is(tok::raw_identifier)) {
986       IdentifierInfo &Info = IdentTable.get(FormatTok->TokenText);
987       FormatTok->Tok.setIdentifierInfo(&Info);
988       FormatTok->Tok.setKind(Info.getTokenID());
989       if (Style.Language == FormatStyle::LK_Java &&
990           FormatTok->isOneOf(tok::kw_struct, tok::kw_union, tok::kw_delete)) {
991         FormatTok->Tok.setKind(tok::identifier);
992         FormatTok->Tok.setIdentifierInfo(nullptr);
993       }
994     } else if (FormatTok->Tok.is(tok::greatergreater)) {
995       FormatTok->Tok.setKind(tok::greater);
996       FormatTok->TokenText = FormatTok->TokenText.substr(0, 1);
997       GreaterStashed = true;
998     } else if (FormatTok->Tok.is(tok::lessless)) {
999       FormatTok->Tok.setKind(tok::less);
1000       FormatTok->TokenText = FormatTok->TokenText.substr(0, 1);
1001       LessStashed = true;
1002     }
1003 
1004     // Now FormatTok is the next non-whitespace token.
1005 
1006     StringRef Text = FormatTok->TokenText;
1007     size_t FirstNewlinePos = Text.find('\n');
1008     if (FirstNewlinePos == StringRef::npos) {
1009       // FIXME: ColumnWidth actually depends on the start column, we need to
1010       // take this into account when the token is moved.
1011       FormatTok->ColumnWidth =
1012           encoding::columnWidthWithTabs(Text, Column, Style.TabWidth, Encoding);
1013       Column += FormatTok->ColumnWidth;
1014     } else {
1015       FormatTok->IsMultiline = true;
1016       // FIXME: ColumnWidth actually depends on the start column, we need to
1017       // take this into account when the token is moved.
1018       FormatTok->ColumnWidth = encoding::columnWidthWithTabs(
1019           Text.substr(0, FirstNewlinePos), Column, Style.TabWidth, Encoding);
1020 
1021       // The last line of the token always starts in column 0.
1022       // Thus, the length can be precomputed even in the presence of tabs.
1023       FormatTok->LastLineColumnWidth = encoding::columnWidthWithTabs(
1024           Text.substr(Text.find_last_of('\n') + 1), 0, Style.TabWidth,
1025           Encoding);
1026       Column = FormatTok->LastLineColumnWidth;
1027     }
1028 
1029     FormatTok->IsForEachMacro =
1030         std::binary_search(ForEachMacros.begin(), ForEachMacros.end(),
1031                            FormatTok->Tok.getIdentifierInfo());
1032 
1033     return FormatTok;
1034   }
1035 
1036   FormatToken *FormatTok;
1037   bool IsFirstToken;
1038   bool GreaterStashed, LessStashed;
1039   unsigned Column;
1040   unsigned TrailingWhitespace;
1041   std::unique_ptr<Lexer> Lex;
1042   SourceManager &SourceMgr;
1043   FileID ID;
1044   FormatStyle &Style;
1045   IdentifierTable IdentTable;
1046   AdditionalKeywords Keywords;
1047   encoding::Encoding Encoding;
1048   llvm::SpecificBumpPtrAllocator<FormatToken> Allocator;
1049   // Index (in 'Tokens') of the last token that starts a new line.
1050   unsigned FirstInLineIndex;
1051   SmallVector<FormatToken *, 16> Tokens;
1052   SmallVector<IdentifierInfo *, 8> ForEachMacros;
1053 
1054   bool FormattingDisabled;
1055 
1056   void readRawToken(FormatToken &Tok) {
1057     Lex->LexFromRawLexer(Tok.Tok);
1058     Tok.TokenText = StringRef(SourceMgr.getCharacterData(Tok.Tok.getLocation()),
1059                               Tok.Tok.getLength());
1060     // For formatting, treat unterminated string literals like normal string
1061     // literals.
1062     if (Tok.is(tok::unknown)) {
1063       if (!Tok.TokenText.empty() && Tok.TokenText[0] == '"') {
1064         Tok.Tok.setKind(tok::string_literal);
1065         Tok.IsUnterminatedLiteral = true;
1066       } else if (Style.Language == FormatStyle::LK_JavaScript &&
1067                  Tok.TokenText == "''") {
1068         Tok.Tok.setKind(tok::char_constant);
1069       }
1070     }
1071 
1072     if (Tok.is(tok::comment) && (Tok.TokenText == "// clang-format on" ||
1073                                  Tok.TokenText == "/* clang-format on */")) {
1074       FormattingDisabled = false;
1075     }
1076 
1077     Tok.Finalized = FormattingDisabled;
1078 
1079     if (Tok.is(tok::comment) && (Tok.TokenText == "// clang-format off" ||
1080                                  Tok.TokenText == "/* clang-format off */")) {
1081       FormattingDisabled = true;
1082     }
1083   }
1084 
1085   void resetLexer(unsigned Offset) {
1086     StringRef Buffer = SourceMgr.getBufferData(ID);
1087     Lex.reset(new Lexer(SourceMgr.getLocForStartOfFile(ID),
1088                         getFormattingLangOpts(Style), Buffer.begin(),
1089                         Buffer.begin() + Offset, Buffer.end()));
1090     Lex->SetKeepWhitespaceMode(true);
1091   }
1092 };
1093 
1094 static StringRef getLanguageName(FormatStyle::LanguageKind Language) {
1095   switch (Language) {
1096   case FormatStyle::LK_Cpp:
1097     return "C++";
1098   case FormatStyle::LK_Java:
1099     return "Java";
1100   case FormatStyle::LK_JavaScript:
1101     return "JavaScript";
1102   case FormatStyle::LK_Proto:
1103     return "Proto";
1104   default:
1105     return "Unknown";
1106   }
1107 }
1108 
1109 class Formatter : public UnwrappedLineConsumer {
1110 public:
1111   Formatter(const FormatStyle &Style, SourceManager &SourceMgr, FileID ID,
1112             ArrayRef<CharSourceRange> Ranges)
1113       : Style(Style), ID(ID), SourceMgr(SourceMgr),
1114         Whitespaces(SourceMgr, Style,
1115                     inputUsesCRLF(SourceMgr.getBufferData(ID))),
1116         Ranges(Ranges.begin(), Ranges.end()), UnwrappedLines(1),
1117         Encoding(encoding::detectEncoding(SourceMgr.getBufferData(ID))) {
1118     DEBUG(llvm::dbgs() << "File encoding: "
1119                        << (Encoding == encoding::Encoding_UTF8 ? "UTF8"
1120                                                                : "unknown")
1121                        << "\n");
1122     DEBUG(llvm::dbgs() << "Language: " << getLanguageName(Style.Language)
1123                        << "\n");
1124   }
1125 
1126   tooling::Replacements format() {
1127     tooling::Replacements Result;
1128     FormatTokenLexer Tokens(SourceMgr, ID, Style, Encoding);
1129 
1130     UnwrappedLineParser Parser(Style, Tokens.getKeywords(), Tokens.lex(),
1131                                *this);
1132     bool StructuralError = Parser.parse();
1133     assert(UnwrappedLines.rbegin()->empty());
1134     for (unsigned Run = 0, RunE = UnwrappedLines.size(); Run + 1 != RunE;
1135          ++Run) {
1136       DEBUG(llvm::dbgs() << "Run " << Run << "...\n");
1137       SmallVector<AnnotatedLine *, 16> AnnotatedLines;
1138       for (unsigned i = 0, e = UnwrappedLines[Run].size(); i != e; ++i) {
1139         AnnotatedLines.push_back(new AnnotatedLine(UnwrappedLines[Run][i]));
1140       }
1141       tooling::Replacements RunResult =
1142           format(AnnotatedLines, StructuralError, Tokens);
1143       DEBUG({
1144         llvm::dbgs() << "Replacements for run " << Run << ":\n";
1145         for (tooling::Replacements::iterator I = RunResult.begin(),
1146                                              E = RunResult.end();
1147              I != E; ++I) {
1148           llvm::dbgs() << I->toString() << "\n";
1149         }
1150       });
1151       for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
1152         delete AnnotatedLines[i];
1153       }
1154       Result.insert(RunResult.begin(), RunResult.end());
1155       Whitespaces.reset();
1156     }
1157     return Result;
1158   }
1159 
1160   tooling::Replacements format(SmallVectorImpl<AnnotatedLine *> &AnnotatedLines,
1161                                bool StructuralError, FormatTokenLexer &Tokens) {
1162     TokenAnnotator Annotator(Style, Tokens.getKeywords());
1163     for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
1164       Annotator.annotate(*AnnotatedLines[i]);
1165     }
1166     deriveLocalStyle(AnnotatedLines);
1167     for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
1168       Annotator.calculateFormattingInformation(*AnnotatedLines[i]);
1169     }
1170     computeAffectedLines(AnnotatedLines.begin(), AnnotatedLines.end());
1171 
1172     Annotator.setCommentLineLevels(AnnotatedLines);
1173     ContinuationIndenter Indenter(Style, Tokens.getKeywords(), SourceMgr,
1174                                   Whitespaces, Encoding,
1175                                   BinPackInconclusiveFunctions);
1176     UnwrappedLineFormatter Formatter(&Indenter, &Whitespaces, Style,
1177                                      Tokens.getKeywords());
1178     Formatter.format(AnnotatedLines, /*DryRun=*/false);
1179     return Whitespaces.generateReplacements();
1180   }
1181 
1182 private:
1183   // Determines which lines are affected by the SourceRanges given as input.
1184   // Returns \c true if at least one line between I and E or one of their
1185   // children is affected.
1186   bool computeAffectedLines(SmallVectorImpl<AnnotatedLine *>::iterator I,
1187                             SmallVectorImpl<AnnotatedLine *>::iterator E) {
1188     bool SomeLineAffected = false;
1189     const AnnotatedLine *PreviousLine = nullptr;
1190     while (I != E) {
1191       AnnotatedLine *Line = *I;
1192       Line->LeadingEmptyLinesAffected = affectsLeadingEmptyLines(*Line->First);
1193 
1194       // If a line is part of a preprocessor directive, it needs to be formatted
1195       // if any token within the directive is affected.
1196       if (Line->InPPDirective) {
1197         FormatToken *Last = Line->Last;
1198         SmallVectorImpl<AnnotatedLine *>::iterator PPEnd = I + 1;
1199         while (PPEnd != E && !(*PPEnd)->First->HasUnescapedNewline) {
1200           Last = (*PPEnd)->Last;
1201           ++PPEnd;
1202         }
1203 
1204         if (affectsTokenRange(*Line->First, *Last,
1205                               /*IncludeLeadingNewlines=*/false)) {
1206           SomeLineAffected = true;
1207           markAllAsAffected(I, PPEnd);
1208         }
1209         I = PPEnd;
1210         continue;
1211       }
1212 
1213       if (nonPPLineAffected(Line, PreviousLine))
1214         SomeLineAffected = true;
1215 
1216       PreviousLine = Line;
1217       ++I;
1218     }
1219     return SomeLineAffected;
1220   }
1221 
1222   // Determines whether 'Line' is affected by the SourceRanges given as input.
1223   // Returns \c true if line or one if its children is affected.
1224   bool nonPPLineAffected(AnnotatedLine *Line,
1225                          const AnnotatedLine *PreviousLine) {
1226     bool SomeLineAffected = false;
1227     Line->ChildrenAffected =
1228         computeAffectedLines(Line->Children.begin(), Line->Children.end());
1229     if (Line->ChildrenAffected)
1230       SomeLineAffected = true;
1231 
1232     // Stores whether one of the line's tokens is directly affected.
1233     bool SomeTokenAffected = false;
1234     // Stores whether we need to look at the leading newlines of the next token
1235     // in order to determine whether it was affected.
1236     bool IncludeLeadingNewlines = false;
1237 
1238     // Stores whether the first child line of any of this line's tokens is
1239     // affected.
1240     bool SomeFirstChildAffected = false;
1241 
1242     for (FormatToken *Tok = Line->First; Tok; Tok = Tok->Next) {
1243       // Determine whether 'Tok' was affected.
1244       if (affectsTokenRange(*Tok, *Tok, IncludeLeadingNewlines))
1245         SomeTokenAffected = true;
1246 
1247       // Determine whether the first child of 'Tok' was affected.
1248       if (!Tok->Children.empty() && Tok->Children.front()->Affected)
1249         SomeFirstChildAffected = true;
1250 
1251       IncludeLeadingNewlines = Tok->Children.empty();
1252     }
1253 
1254     // Was this line moved, i.e. has it previously been on the same line as an
1255     // affected line?
1256     bool LineMoved = PreviousLine && PreviousLine->Affected &&
1257                      Line->First->NewlinesBefore == 0;
1258 
1259     bool IsContinuedComment =
1260         Line->First->is(tok::comment) && Line->First->Next == nullptr &&
1261         Line->First->NewlinesBefore < 2 && PreviousLine &&
1262         PreviousLine->Affected && PreviousLine->Last->is(tok::comment);
1263 
1264     if (SomeTokenAffected || SomeFirstChildAffected || LineMoved ||
1265         IsContinuedComment) {
1266       Line->Affected = true;
1267       SomeLineAffected = true;
1268     }
1269     return SomeLineAffected;
1270   }
1271 
1272   // Marks all lines between I and E as well as all their children as affected.
1273   void markAllAsAffected(SmallVectorImpl<AnnotatedLine *>::iterator I,
1274                          SmallVectorImpl<AnnotatedLine *>::iterator E) {
1275     while (I != E) {
1276       (*I)->Affected = true;
1277       markAllAsAffected((*I)->Children.begin(), (*I)->Children.end());
1278       ++I;
1279     }
1280   }
1281 
1282   // Returns true if the range from 'First' to 'Last' intersects with one of the
1283   // input ranges.
1284   bool affectsTokenRange(const FormatToken &First, const FormatToken &Last,
1285                          bool IncludeLeadingNewlines) {
1286     SourceLocation Start = First.WhitespaceRange.getBegin();
1287     if (!IncludeLeadingNewlines)
1288       Start = Start.getLocWithOffset(First.LastNewlineOffset);
1289     SourceLocation End = Last.getStartOfNonWhitespace();
1290     End = End.getLocWithOffset(Last.TokenText.size());
1291     CharSourceRange Range = CharSourceRange::getCharRange(Start, End);
1292     return affectsCharSourceRange(Range);
1293   }
1294 
1295   // Returns true if one of the input ranges intersect the leading empty lines
1296   // before 'Tok'.
1297   bool affectsLeadingEmptyLines(const FormatToken &Tok) {
1298     CharSourceRange EmptyLineRange = CharSourceRange::getCharRange(
1299         Tok.WhitespaceRange.getBegin(),
1300         Tok.WhitespaceRange.getBegin().getLocWithOffset(Tok.LastNewlineOffset));
1301     return affectsCharSourceRange(EmptyLineRange);
1302   }
1303 
1304   // Returns true if 'Range' intersects with one of the input ranges.
1305   bool affectsCharSourceRange(const CharSourceRange &Range) {
1306     for (SmallVectorImpl<CharSourceRange>::const_iterator I = Ranges.begin(),
1307                                                           E = Ranges.end();
1308          I != E; ++I) {
1309       if (!SourceMgr.isBeforeInTranslationUnit(Range.getEnd(), I->getBegin()) &&
1310           !SourceMgr.isBeforeInTranslationUnit(I->getEnd(), Range.getBegin()))
1311         return true;
1312     }
1313     return false;
1314   }
1315 
1316   static bool inputUsesCRLF(StringRef Text) {
1317     return Text.count('\r') * 2 > Text.count('\n');
1318   }
1319 
1320   void
1321   deriveLocalStyle(const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines) {
1322     unsigned CountBoundToVariable = 0;
1323     unsigned CountBoundToType = 0;
1324     bool HasCpp03IncompatibleFormat = false;
1325     bool HasBinPackedFunction = false;
1326     bool HasOnePerLineFunction = false;
1327     for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
1328       if (!AnnotatedLines[i]->First->Next)
1329         continue;
1330       FormatToken *Tok = AnnotatedLines[i]->First->Next;
1331       while (Tok->Next) {
1332         if (Tok->is(TT_PointerOrReference)) {
1333           bool SpacesBefore =
1334               Tok->WhitespaceRange.getBegin() != Tok->WhitespaceRange.getEnd();
1335           bool SpacesAfter = Tok->Next->WhitespaceRange.getBegin() !=
1336                              Tok->Next->WhitespaceRange.getEnd();
1337           if (SpacesBefore && !SpacesAfter)
1338             ++CountBoundToVariable;
1339           else if (!SpacesBefore && SpacesAfter)
1340             ++CountBoundToType;
1341         }
1342 
1343         if (Tok->WhitespaceRange.getBegin() == Tok->WhitespaceRange.getEnd()) {
1344           if (Tok->is(tok::coloncolon) && Tok->Previous->is(TT_TemplateOpener))
1345             HasCpp03IncompatibleFormat = true;
1346           if (Tok->is(TT_TemplateCloser) &&
1347               Tok->Previous->is(TT_TemplateCloser))
1348             HasCpp03IncompatibleFormat = true;
1349         }
1350 
1351         if (Tok->PackingKind == PPK_BinPacked)
1352           HasBinPackedFunction = true;
1353         if (Tok->PackingKind == PPK_OnePerLine)
1354           HasOnePerLineFunction = true;
1355 
1356         Tok = Tok->Next;
1357       }
1358     }
1359     if (Style.DerivePointerAlignment) {
1360       if (CountBoundToType > CountBoundToVariable)
1361         Style.PointerAlignment = FormatStyle::PAS_Left;
1362       else if (CountBoundToType < CountBoundToVariable)
1363         Style.PointerAlignment = FormatStyle::PAS_Right;
1364     }
1365     if (Style.Standard == FormatStyle::LS_Auto) {
1366       Style.Standard = HasCpp03IncompatibleFormat ? FormatStyle::LS_Cpp11
1367                                                   : FormatStyle::LS_Cpp03;
1368     }
1369     BinPackInconclusiveFunctions =
1370         HasBinPackedFunction || !HasOnePerLineFunction;
1371   }
1372 
1373   void consumeUnwrappedLine(const UnwrappedLine &TheLine) override {
1374     assert(!UnwrappedLines.empty());
1375     UnwrappedLines.back().push_back(TheLine);
1376   }
1377 
1378   void finishRun() override {
1379     UnwrappedLines.push_back(SmallVector<UnwrappedLine, 16>());
1380   }
1381 
1382   FormatStyle Style;
1383   FileID ID;
1384   SourceManager &SourceMgr;
1385   WhitespaceManager Whitespaces;
1386   SmallVector<CharSourceRange, 8> Ranges;
1387   SmallVector<SmallVector<UnwrappedLine, 16>, 2> UnwrappedLines;
1388 
1389   encoding::Encoding Encoding;
1390   bool BinPackInconclusiveFunctions;
1391 };
1392 
1393 } // end anonymous namespace
1394 
1395 tooling::Replacements reformat(const FormatStyle &Style, Lexer &Lex,
1396                                SourceManager &SourceMgr,
1397                                ArrayRef<CharSourceRange> Ranges) {
1398   if (Style.DisableFormat)
1399     return tooling::Replacements();
1400   return reformat(Style, SourceMgr,
1401                   SourceMgr.getFileID(Lex.getSourceLocation()), Ranges);
1402 }
1403 
1404 tooling::Replacements reformat(const FormatStyle &Style,
1405                                SourceManager &SourceMgr, FileID ID,
1406                                ArrayRef<CharSourceRange> Ranges) {
1407   if (Style.DisableFormat)
1408     return tooling::Replacements();
1409   Formatter formatter(Style, SourceMgr, ID, Ranges);
1410   return formatter.format();
1411 }
1412 
1413 tooling::Replacements reformat(const FormatStyle &Style, StringRef Code,
1414                                ArrayRef<tooling::Range> Ranges,
1415                                StringRef FileName) {
1416   if (Style.DisableFormat)
1417     return tooling::Replacements();
1418 
1419   FileManager Files((FileSystemOptions()));
1420   DiagnosticsEngine Diagnostics(
1421       IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
1422       new DiagnosticOptions);
1423   SourceManager SourceMgr(Diagnostics, Files);
1424   std::unique_ptr<llvm::MemoryBuffer> Buf =
1425       llvm::MemoryBuffer::getMemBuffer(Code, FileName);
1426   const clang::FileEntry *Entry =
1427       Files.getVirtualFile(FileName, Buf->getBufferSize(), 0);
1428   SourceMgr.overrideFileContents(Entry, std::move(Buf));
1429   FileID ID =
1430       SourceMgr.createFileID(Entry, SourceLocation(), clang::SrcMgr::C_User);
1431   SourceLocation StartOfFile = SourceMgr.getLocForStartOfFile(ID);
1432   std::vector<CharSourceRange> CharRanges;
1433   for (const tooling::Range &Range : Ranges) {
1434     SourceLocation Start = StartOfFile.getLocWithOffset(Range.getOffset());
1435     SourceLocation End = Start.getLocWithOffset(Range.getLength());
1436     CharRanges.push_back(CharSourceRange::getCharRange(Start, End));
1437   }
1438   return reformat(Style, SourceMgr, ID, CharRanges);
1439 }
1440 
1441 LangOptions getFormattingLangOpts(const FormatStyle &Style) {
1442   LangOptions LangOpts;
1443   LangOpts.CPlusPlus = 1;
1444   LangOpts.CPlusPlus11 = Style.Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
1445   LangOpts.CPlusPlus14 = Style.Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
1446   LangOpts.LineComment = 1;
1447   bool AlternativeOperators = Style.Language != FormatStyle::LK_JavaScript &&
1448                               Style.Language != FormatStyle::LK_Java;
1449   LangOpts.CXXOperatorNames = AlternativeOperators ? 1 : 0;
1450   LangOpts.Bool = 1;
1451   LangOpts.ObjC1 = 1;
1452   LangOpts.ObjC2 = 1;
1453   LangOpts.MicrosoftExt = 1; // To get kw___try, kw___finally.
1454   return LangOpts;
1455 }
1456 
1457 const char *StyleOptionHelpDescription =
1458     "Coding style, currently supports:\n"
1459     "  LLVM, Google, Chromium, Mozilla, WebKit.\n"
1460     "Use -style=file to load style configuration from\n"
1461     ".clang-format file located in one of the parent\n"
1462     "directories of the source file (or current\n"
1463     "directory for stdin).\n"
1464     "Use -style=\"{key: value, ...}\" to set specific\n"
1465     "parameters, e.g.:\n"
1466     "  -style=\"{BasedOnStyle: llvm, IndentWidth: 8}\"";
1467 
1468 static FormatStyle::LanguageKind getLanguageByFileName(StringRef FileName) {
1469   if (FileName.endswith(".java")) {
1470     return FormatStyle::LK_Java;
1471   } else if (FileName.endswith_lower(".js")) {
1472     return FormatStyle::LK_JavaScript;
1473   } else if (FileName.endswith_lower(".proto") ||
1474              FileName.endswith_lower(".protodevel")) {
1475     return FormatStyle::LK_Proto;
1476   }
1477   return FormatStyle::LK_Cpp;
1478 }
1479 
1480 FormatStyle getStyle(StringRef StyleName, StringRef FileName,
1481                      StringRef FallbackStyle) {
1482   FormatStyle Style = getLLVMStyle();
1483   Style.Language = getLanguageByFileName(FileName);
1484   if (!getPredefinedStyle(FallbackStyle, Style.Language, &Style)) {
1485     llvm::errs() << "Invalid fallback style \"" << FallbackStyle
1486                  << "\" using LLVM style\n";
1487     return Style;
1488   }
1489 
1490   if (StyleName.startswith("{")) {
1491     // Parse YAML/JSON style from the command line.
1492     if (std::error_code ec = parseConfiguration(StyleName, &Style)) {
1493       llvm::errs() << "Error parsing -style: " << ec.message() << ", using "
1494                    << FallbackStyle << " style\n";
1495     }
1496     return Style;
1497   }
1498 
1499   if (!StyleName.equals_lower("file")) {
1500     if (!getPredefinedStyle(StyleName, Style.Language, &Style))
1501       llvm::errs() << "Invalid value for -style, using " << FallbackStyle
1502                    << " style\n";
1503     return Style;
1504   }
1505 
1506   // Look for .clang-format/_clang-format file in the file's parent directories.
1507   SmallString<128> UnsuitableConfigFiles;
1508   SmallString<128> Path(FileName);
1509   llvm::sys::fs::make_absolute(Path);
1510   for (StringRef Directory = Path; !Directory.empty();
1511        Directory = llvm::sys::path::parent_path(Directory)) {
1512     if (!llvm::sys::fs::is_directory(Directory))
1513       continue;
1514     SmallString<128> ConfigFile(Directory);
1515 
1516     llvm::sys::path::append(ConfigFile, ".clang-format");
1517     DEBUG(llvm::dbgs() << "Trying " << ConfigFile << "...\n");
1518     bool IsFile = false;
1519     // Ignore errors from is_regular_file: we only need to know if we can read
1520     // the file or not.
1521     llvm::sys::fs::is_regular_file(Twine(ConfigFile), IsFile);
1522 
1523     if (!IsFile) {
1524       // Try _clang-format too, since dotfiles are not commonly used on Windows.
1525       ConfigFile = Directory;
1526       llvm::sys::path::append(ConfigFile, "_clang-format");
1527       DEBUG(llvm::dbgs() << "Trying " << ConfigFile << "...\n");
1528       llvm::sys::fs::is_regular_file(Twine(ConfigFile), IsFile);
1529     }
1530 
1531     if (IsFile) {
1532       llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Text =
1533           llvm::MemoryBuffer::getFile(ConfigFile.c_str());
1534       if (std::error_code EC = Text.getError()) {
1535         llvm::errs() << EC.message() << "\n";
1536         break;
1537       }
1538       if (std::error_code ec =
1539               parseConfiguration(Text.get()->getBuffer(), &Style)) {
1540         if (ec == ParseError::Unsuitable) {
1541           if (!UnsuitableConfigFiles.empty())
1542             UnsuitableConfigFiles.append(", ");
1543           UnsuitableConfigFiles.append(ConfigFile);
1544           continue;
1545         }
1546         llvm::errs() << "Error reading " << ConfigFile << ": " << ec.message()
1547                      << "\n";
1548         break;
1549       }
1550       DEBUG(llvm::dbgs() << "Using configuration file " << ConfigFile << "\n");
1551       return Style;
1552     }
1553   }
1554   llvm::errs() << "Can't find usable .clang-format, using " << FallbackStyle
1555                << " style\n";
1556   if (!UnsuitableConfigFiles.empty()) {
1557     llvm::errs() << "Configuration file(s) do(es) not support "
1558                  << getLanguageName(Style.Language) << ": "
1559                  << UnsuitableConfigFiles << "\n";
1560   }
1561   return Style;
1562 }
1563 
1564 } // namespace format
1565 } // namespace clang
1566