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
|
//===--- CommentCommandTraits.cpp - Comment command properties --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/CommentCommandTraits.h"
#include "llvm/ADT/STLExtras.h"
namespace clang {
namespace comments {
#include "clang/AST/CommentCommandInfo.inc"
CommandTraits::CommandTraits(llvm::BumpPtrAllocator &Allocator,
const CommentOptions &CommentOptions) :
NextID(llvm::array_lengthof(Commands)), Allocator(Allocator) {
registerCommentOptions(CommentOptions);
}
void CommandTraits::registerCommentOptions(
const CommentOptions &CommentOptions) {
for (CommentOptions::BlockCommandNamesTy::const_iterator
I = CommentOptions.BlockCommandNames.begin(),
E = CommentOptions.BlockCommandNames.end();
I != E; I++) {
registerBlockCommand(*I);
}
}
const CommandInfo *CommandTraits::getCommandInfoOrNULL(StringRef Name) const {
if (const CommandInfo *Info = getBuiltinCommandInfo(Name))
return Info;
return getRegisteredCommandInfo(Name);
}
const CommandInfo *CommandTraits::getCommandInfo(unsigned CommandID) const {
if (const CommandInfo *Info = getBuiltinCommandInfo(CommandID))
return Info;
return getRegisteredCommandInfo(CommandID);
}
const CommandInfo *
CommandTraits::getTypoCorrectCommandInfo(StringRef Typo) const {
// Single-character command impostures, such as \t or \n, should not go
// through the fixit logic.
if (Typo.size() <= 1)
return nullptr;
// The maximum edit distance we're prepared to accept.
const unsigned MaxEditDistance = 1;
unsigned BestEditDistance = MaxEditDistance;
SmallVector<const CommandInfo *, 2> BestCommand;
auto ConsiderCorrection = [&](const CommandInfo *Command) {
StringRef Name = Command->Name;
unsigned MinPossibleEditDistance = abs((int)Name.size() - (int)Typo.size());
if (MinPossibleEditDistance <= BestEditDistance) {
unsigned EditDistance = Typo.edit_distance(Name, true, BestEditDistance);
if (EditDistance < BestEditDistance) {
BestEditDistance = EditDistance;
BestCommand.clear();
}
if (EditDistance == BestEditDistance)
BestCommand.push_back(Command);
}
};
for (const auto &Command : Commands)
ConsiderCorrection(&Command);
for (const auto *Command : RegisteredCommands)
if (!Command->IsUnknownCommand)
ConsiderCorrection(Command);
return BestCommand.size() == 1 ? BestCommand[0] : nullptr;
}
CommandInfo *CommandTraits::createCommandInfoWithName(StringRef CommandName) {
char *Name = Allocator.Allocate<char>(CommandName.size() + 1);
memcpy(Name, CommandName.data(), CommandName.size());
Name[CommandName.size()] = '\0';
// Value-initialize (=zero-initialize in this case) a new CommandInfo.
CommandInfo *Info = new (Allocator) CommandInfo();
Info->Name = Name;
// We only have a limited number of bits to encode command IDs in the
// CommandInfo structure, so the ID numbers can potentially wrap around.
assert((NextID < (1 << CommandInfo::NumCommandIDBits))
&& "Too many commands. We have limited bits for the command ID.");
Info->ID = NextID++;
RegisteredCommands.push_back(Info);
return Info;
}
const CommandInfo *CommandTraits::registerUnknownCommand(
StringRef CommandName) {
CommandInfo *Info = createCommandInfoWithName(CommandName);
Info->IsUnknownCommand = true;
return Info;
}
const CommandInfo *CommandTraits::registerBlockCommand(StringRef CommandName) {
CommandInfo *Info = createCommandInfoWithName(CommandName);
Info->IsBlockCommand = true;
return Info;
}
const CommandInfo *CommandTraits::getBuiltinCommandInfo(
unsigned CommandID) {
if (CommandID < llvm::array_lengthof(Commands))
return &Commands[CommandID];
return nullptr;
}
const CommandInfo *CommandTraits::getRegisteredCommandInfo(
StringRef Name) const {
for (unsigned i = 0, e = RegisteredCommands.size(); i != e; ++i) {
if (RegisteredCommands[i]->Name == Name)
return RegisteredCommands[i];
}
return nullptr;
}
const CommandInfo *CommandTraits::getRegisteredCommandInfo(
unsigned CommandID) const {
return RegisteredCommands[CommandID - llvm::array_lengthof(Commands)];
}
} // end namespace comments
} // end namespace clang
|
