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_LIB_FORMAT_TOKENANNOTATOR_H
17 #define LLVM_CLANG_LIB_FORMAT_TOKENANNOTATOR_H
19 #include "UnwrappedLineParser.h"
20 #include "clang/Format/Format.h"
30 LT_ObjCDecl, // An @interface, @implementation, or @protocol line.
32 LT_ObjCProperty, // An @property line.
34 LT_PreprocessorDirective,
35 LT_VirtualFunctionDecl
40 AnnotatedLine(const UnwrappedLine &Line)
41 : First(Line.Tokens.front().Tok), Level(Line.Level),
42 MatchingOpeningBlockLineIndex(Line.MatchingOpeningBlockLineIndex),
43 InPPDirective(Line.InPPDirective),
44 MustBeDeclaration(Line.MustBeDeclaration), MightBeFunctionDecl(false),
45 IsMultiVariableDeclStmt(false), Affected(false),
46 LeadingEmptyLinesAffected(false), ChildrenAffected(false) {
47 assert(!Line.Tokens.empty());
49 // Calculate Next and Previous for all tokens. Note that we must overwrite
50 // Next and Previous for every token, as previous formatting runs might have
51 // left them in a different state.
52 First->Previous = nullptr;
53 FormatToken *Current = First;
54 for (std::list<UnwrappedLineNode>::const_iterator I = ++Line.Tokens.begin(),
55 E = Line.Tokens.end();
57 const UnwrappedLineNode &Node = *I;
58 Current->Next = I->Tok;
59 I->Tok->Previous = Current;
60 Current = Current->Next;
61 Current->Children.clear();
62 for (const auto &Child : Node.Children) {
63 Children.push_back(new AnnotatedLine(Child));
64 Current->Children.push_back(Children.back());
72 for (unsigned i = 0, e = Children.size(); i != e; ++i) {
75 FormatToken *Current = First;
77 Current->Children.clear();
78 Current->Role.reset();
79 Current = Current->Next;
83 /// \c true if this line starts with the given tokens in order, ignoring
85 template <typename... Ts> bool startsWith(Ts... Tokens) const {
86 return First && First->startsSequence(Tokens...);
89 /// \c true if this line ends with the given tokens in reversed order,
90 /// ignoring comments.
91 /// For example, given tokens [T1, T2, T3, ...], the function returns true if
92 /// this line is like "... T3 T2 T1".
93 template <typename... Ts> bool endsWith(Ts... Tokens) const {
94 return Last && Last->endsSequence(Tokens...);
97 /// \c true if this line looks like a function definition instead of a
98 /// function declaration. Asserts MightBeFunctionDecl.
99 bool mightBeFunctionDefinition() const {
100 assert(MightBeFunctionDecl);
101 // FIXME: Line.Last points to other characters than tok::semi
103 return !Last->isOneOf(tok::semi, tok::comment);
109 SmallVector<AnnotatedLine *, 0> Children;
113 size_t MatchingOpeningBlockLineIndex;
115 bool MustBeDeclaration;
116 bool MightBeFunctionDecl;
117 bool IsMultiVariableDeclStmt;
119 /// \c True if this line should be formatted, i.e. intersects directly or
120 /// indirectly with one of the input ranges.
123 /// \c True if the leading empty lines of this line intersect with one of the
125 bool LeadingEmptyLinesAffected;
127 /// \c True if one of this line's children intersects with an input range.
128 bool ChildrenAffected;
132 AnnotatedLine(const AnnotatedLine &) = delete;
133 void operator=(const AnnotatedLine &) = delete;
136 /// \brief Determines extra information about the tokens comprising an
137 /// \c UnwrappedLine.
138 class TokenAnnotator {
140 TokenAnnotator(const FormatStyle &Style, const AdditionalKeywords &Keywords)
141 : Style(Style), Keywords(Keywords) {}
143 /// \brief Adapts the indent levels of comment lines to the indent of the
145 // FIXME: Can/should this be done in the UnwrappedLineParser?
146 void setCommentLineLevels(SmallVectorImpl<AnnotatedLine *> &Lines);
148 void annotate(AnnotatedLine &Line);
149 void calculateFormattingInformation(AnnotatedLine &Line);
152 /// \brief Calculate the penalty for splitting before \c Tok.
153 unsigned splitPenalty(const AnnotatedLine &Line, const FormatToken &Tok,
154 bool InFunctionDecl);
156 bool spaceRequiredBetween(const AnnotatedLine &Line, const FormatToken &Left,
157 const FormatToken &Right);
159 bool spaceRequiredBefore(const AnnotatedLine &Line, const FormatToken &Tok);
161 bool mustBreakBefore(const AnnotatedLine &Line, const FormatToken &Right);
163 bool canBreakBefore(const AnnotatedLine &Line, const FormatToken &Right);
165 bool mustBreakForReturnType(const AnnotatedLine &Line) const;
167 void printDebugInfo(const AnnotatedLine &Line);
169 void calculateUnbreakableTailLengths(AnnotatedLine &Line);
171 const FormatStyle &Style;
173 const AdditionalKeywords &Keywords;
176 } // end namespace format
177 } // end namespace clang