1 //===--- TokenAnnotator.h - Format C++ code ---------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief This file implements a token annotator, i.e. creates
12 /// \c AnnotatedTokens out of \c FormatTokens with required extra information.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_CLANG_FORMAT_TOKEN_ANNOTATOR_H
17 #define LLVM_CLANG_FORMAT_TOKEN_ANNOTATOR_H
19 #include "UnwrappedLineParser.h"
20 #include "clang/Format/Format.h"
31 LT_PreprocessorDirective,
32 LT_VirtualFunctionDecl,
33 LT_ObjCDecl, // An @interface, @implementation, or @protocol line.
35 LT_ObjCProperty // An @property line.
40 AnnotatedLine(const UnwrappedLine &Line)
41 : First(Line.Tokens.front().Tok), Level(Line.Level),
42 InPPDirective(Line.InPPDirective),
43 MustBeDeclaration(Line.MustBeDeclaration), MightBeFunctionDecl(false),
44 Affected(false), LeadingEmptyLinesAffected(false),
45 ChildrenAffected(false) {
46 assert(!Line.Tokens.empty());
48 // Calculate Next and Previous for all tokens. Note that we must overwrite
49 // Next and Previous for every token, as previous formatting runs might have
50 // left them in a different state.
51 First->Previous = nullptr;
52 FormatToken *Current = First;
53 for (std::list<UnwrappedLineNode>::const_iterator I = ++Line.Tokens.begin(),
54 E = Line.Tokens.end();
56 const UnwrappedLineNode &Node = *I;
57 Current->Next = I->Tok;
58 I->Tok->Previous = Current;
59 Current = Current->Next;
60 Current->Children.clear();
61 for (SmallVectorImpl<UnwrappedLine>::const_iterator
62 I = Node.Children.begin(),
63 E = Node.Children.end();
65 Children.push_back(new AnnotatedLine(*I));
66 Current->Children.push_back(Children.back());
74 for (unsigned i = 0, e = Children.size(); i != e; ++i) {
82 SmallVector<AnnotatedLine *, 0> Children;
87 bool MustBeDeclaration;
88 bool MightBeFunctionDecl;
90 /// \c True if this line should be formatted, i.e. intersects directly or
91 /// indirectly with one of the input ranges.
94 /// \c True if the leading empty lines of this line intersect with one of the
96 bool LeadingEmptyLinesAffected;
98 /// \c True if a one of this line's children intersects with an input range.
99 bool ChildrenAffected;
103 AnnotatedLine(const AnnotatedLine &) LLVM_DELETED_FUNCTION;
104 void operator=(const AnnotatedLine &) LLVM_DELETED_FUNCTION;
107 /// \brief Determines extra information about the tokens comprising an
108 /// \c UnwrappedLine.
109 class TokenAnnotator {
111 TokenAnnotator(const FormatStyle &Style, IdentifierInfo &Ident_in)
112 : Style(Style), Ident_in(Ident_in) {}
114 /// \brief Adapts the indent levels of comment lines to the indent of the
116 // FIXME: Can/should this be done in the UnwrappedLineParser?
117 void setCommentLineLevels(SmallVectorImpl<AnnotatedLine *> &Lines);
119 void annotate(AnnotatedLine &Line);
120 void calculateFormattingInformation(AnnotatedLine &Line);
123 /// \brief Calculate the penalty for splitting before \c Tok.
124 unsigned splitPenalty(const AnnotatedLine &Line, const FormatToken &Tok,
125 bool InFunctionDecl);
127 bool spaceRequiredBetween(const AnnotatedLine &Line, const FormatToken &Left,
128 const FormatToken &Right);
130 bool spaceRequiredBefore(const AnnotatedLine &Line, const FormatToken &Tok);
132 bool mustBreakBefore(const AnnotatedLine &Line, const FormatToken &Right);
134 bool canBreakBefore(const AnnotatedLine &Line, const FormatToken &Right);
136 void printDebugInfo(const AnnotatedLine &Line);
138 void calculateUnbreakableTailLengths(AnnotatedLine &Line);
140 const FormatStyle &Style;
142 // Contextual keywords:
143 IdentifierInfo &Ident_in;
146 } // end namespace format
147 } // end namespace clang
149 #endif // LLVM_CLANG_FORMAT_TOKEN_ANNOTATOR_H