1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
//===--- NamespaceEndCommentsFixer.cpp --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file implements NamespaceEndCommentsFixer, a TokenAnalyzer that
/// fixes namespace end comments.
///
//===----------------------------------------------------------------------===//
#include "NamespaceEndCommentsFixer.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Regex.h"
#define DEBUG_TYPE "namespace-end-comments-fixer"
namespace clang {
namespace format {
namespace {
// The maximal number of unwrapped lines that a short namespace spans.
// Short namespaces don't need an end comment.
static const int kShortNamespaceMaxLines = 1;
// Matches a valid namespace end comment.
// Valid namespace end comments don't need to be edited.
static llvm::Regex kNamespaceCommentPattern =
llvm::Regex("^/[/*] *(end (of )?)? *(anonymous|unnamed)? *"
"namespace( +([a-zA-Z0-9:_]+))?\\.? *(\\*/)?$",
llvm::Regex::IgnoreCase);
// Computes the name of a namespace given the namespace token.
// Returns "" for anonymous namespace.
std::string computeName(const FormatToken *NamespaceTok) {
assert(NamespaceTok && NamespaceTok->is(tok::kw_namespace) &&
"expecting a namespace token");
std::string name = "";
// Collects all the non-comment tokens between 'namespace' and '{'.
const FormatToken *Tok = NamespaceTok->getNextNonComment();
while (Tok && !Tok->is(tok::l_brace)) {
name += Tok->TokenText;
Tok = Tok->getNextNonComment();
}
return name;
}
std::string computeEndCommentText(StringRef NamespaceName, bool AddNewline) {
std::string text = "// namespace";
if (!NamespaceName.empty()) {
text += ' ';
text += NamespaceName;
}
if (AddNewline)
text += '\n';
return text;
}
bool hasEndComment(const FormatToken *RBraceTok) {
return RBraceTok->Next && RBraceTok->Next->is(tok::comment);
}
bool validEndComment(const FormatToken *RBraceTok, StringRef NamespaceName) {
assert(hasEndComment(RBraceTok));
const FormatToken *Comment = RBraceTok->Next;
SmallVector<StringRef, 7> Groups;
if (kNamespaceCommentPattern.match(Comment->TokenText, &Groups)) {
StringRef NamespaceNameInComment = Groups.size() > 5 ? Groups[5] : "";
// Anonymous namespace comments must not mention a namespace name.
if (NamespaceName.empty() && !NamespaceNameInComment.empty())
return false;
StringRef AnonymousInComment = Groups.size() > 3 ? Groups[3] : "";
// Named namespace comments must not mention anonymous namespace.
if (!NamespaceName.empty() && !AnonymousInComment.empty())
return false;
return NamespaceNameInComment == NamespaceName;
}
return false;
}
void addEndComment(const FormatToken *RBraceTok, StringRef EndCommentText,
const SourceManager &SourceMgr,
tooling::Replacements *Fixes) {
auto EndLoc = RBraceTok->Tok.getEndLoc();
auto Range = CharSourceRange::getCharRange(EndLoc, EndLoc);
auto Err = Fixes->add(tooling::Replacement(SourceMgr, Range, EndCommentText));
if (Err) {
llvm::errs() << "Error while adding namespace end comment: "
<< llvm::toString(std::move(Err)) << "\n";
}
}
void updateEndComment(const FormatToken *RBraceTok, StringRef EndCommentText,
const SourceManager &SourceMgr,
tooling::Replacements *Fixes) {
assert(hasEndComment(RBraceTok));
const FormatToken *Comment = RBraceTok->Next;
auto Range = CharSourceRange::getCharRange(Comment->getStartOfNonWhitespace(),
Comment->Tok.getEndLoc());
auto Err = Fixes->add(tooling::Replacement(SourceMgr, Range, EndCommentText));
if (Err) {
llvm::errs() << "Error while updating namespace end comment: "
<< llvm::toString(std::move(Err)) << "\n";
}
}
const FormatToken *
getNamespaceToken(const AnnotatedLine *line,
const SmallVectorImpl<AnnotatedLine *> &AnnotatedLines) {
if (!line->Affected || line->InPPDirective || !line->startsWith(tok::r_brace))
return nullptr;
size_t StartLineIndex = line->MatchingOpeningBlockLineIndex;
if (StartLineIndex == UnwrappedLine::kInvalidIndex)
return nullptr;
assert(StartLineIndex < AnnotatedLines.size());
const FormatToken *NamespaceTok = AnnotatedLines[StartLineIndex]->First;
if (NamespaceTok->is(tok::l_brace)) {
// "namespace" keyword can be on the line preceding '{', e.g. in styles
// where BraceWrapping.AfterNamespace is true.
if (StartLineIndex > 0)
NamespaceTok = AnnotatedLines[StartLineIndex - 1]->First;
}
// Detect "(inline)? namespace" in the beginning of a line.
if (NamespaceTok->is(tok::kw_inline))
NamespaceTok = NamespaceTok->getNextNonComment();
if (!NamespaceTok || NamespaceTok->isNot(tok::kw_namespace))
return nullptr;
return NamespaceTok;
}
} // namespace
NamespaceEndCommentsFixer::NamespaceEndCommentsFixer(const Environment &Env,
const FormatStyle &Style)
: TokenAnalyzer(Env, Style) {}
std::pair<tooling::Replacements, unsigned> NamespaceEndCommentsFixer::analyze(
TokenAnnotator &Annotator, SmallVectorImpl<AnnotatedLine *> &AnnotatedLines,
FormatTokenLexer &Tokens) {
const SourceManager &SourceMgr = Env.getSourceManager();
AffectedRangeMgr.computeAffectedLines(AnnotatedLines.begin(),
AnnotatedLines.end());
tooling::Replacements Fixes;
std::string AllNamespaceNames = "";
size_t StartLineIndex = SIZE_MAX;
unsigned int CompactedNamespacesCount = 0;
for (size_t I = 0, E = AnnotatedLines.size(); I != E; ++I) {
const AnnotatedLine *EndLine = AnnotatedLines[I];
const FormatToken *NamespaceTok =
getNamespaceToken(EndLine, AnnotatedLines);
if (!NamespaceTok)
continue;
FormatToken *RBraceTok = EndLine->First;
if (RBraceTok->Finalized)
continue;
RBraceTok->Finalized = true;
const FormatToken *EndCommentPrevTok = RBraceTok;
// Namespaces often end with '};'. In that case, attach namespace end
// comments to the semicolon tokens.
if (RBraceTok->Next && RBraceTok->Next->is(tok::semi)) {
EndCommentPrevTok = RBraceTok->Next;
}
if (StartLineIndex == SIZE_MAX)
StartLineIndex = EndLine->MatchingOpeningBlockLineIndex;
std::string NamespaceName = computeName(NamespaceTok);
if (Style.CompactNamespaces) {
if ((I + 1 < E) &&
getNamespaceToken(AnnotatedLines[I + 1], AnnotatedLines) &&
StartLineIndex - CompactedNamespacesCount - 1 ==
AnnotatedLines[I + 1]->MatchingOpeningBlockLineIndex &&
!AnnotatedLines[I + 1]->First->Finalized) {
if (hasEndComment(EndCommentPrevTok)) {
// remove end comment, it will be merged in next one
updateEndComment(EndCommentPrevTok, std::string(), SourceMgr, &Fixes);
}
CompactedNamespacesCount++;
AllNamespaceNames = "::" + NamespaceName + AllNamespaceNames;
continue;
}
NamespaceName += AllNamespaceNames;
CompactedNamespacesCount = 0;
AllNamespaceNames = std::string();
}
// The next token in the token stream after the place where the end comment
// token must be. This is either the next token on the current line or the
// first token on the next line.
const FormatToken *EndCommentNextTok = EndCommentPrevTok->Next;
if (EndCommentNextTok && EndCommentNextTok->is(tok::comment))
EndCommentNextTok = EndCommentNextTok->Next;
if (!EndCommentNextTok && I + 1 < E)
EndCommentNextTok = AnnotatedLines[I + 1]->First;
bool AddNewline = EndCommentNextTok &&
EndCommentNextTok->NewlinesBefore == 0 &&
EndCommentNextTok->isNot(tok::eof);
const std::string EndCommentText =
computeEndCommentText(NamespaceName, AddNewline);
if (!hasEndComment(EndCommentPrevTok)) {
bool isShort = I - StartLineIndex <= kShortNamespaceMaxLines + 1;
if (!isShort)
addEndComment(EndCommentPrevTok, EndCommentText, SourceMgr, &Fixes);
} else if (!validEndComment(EndCommentPrevTok, NamespaceName)) {
updateEndComment(EndCommentPrevTok, EndCommentText, SourceMgr, &Fixes);
}
StartLineIndex = SIZE_MAX;
}
return {Fixes, 0};
}
} // namespace format
} // namespace clang
|
