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
|
//===--- Stencil.cpp - Stencil implementation -------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/Refactoring/Stencil.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTTypeTraits.h"
#include "clang/AST/Expr.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Lex/Lexer.h"
#include "clang/Tooling/Refactoring/SourceCode.h"
#include "llvm/Support/Errc.h"
#include <atomic>
#include <memory>
#include <string>
using namespace clang;
using namespace tooling;
using ast_matchers::MatchFinder;
using llvm::Error;
// A down_cast function to safely down cast a StencilPartInterface to a subclass
// D. Returns nullptr if P is not an instance of D.
template <typename D> const D *down_cast(const StencilPartInterface *P) {
if (P == nullptr || D::typeId() != P->typeId())
return nullptr;
return static_cast<const D *>(P);
}
static llvm::Expected<ast_type_traits::DynTypedNode>
getNode(const ast_matchers::BoundNodes &Nodes, StringRef Id) {
auto &NodesMap = Nodes.getMap();
auto It = NodesMap.find(Id);
if (It == NodesMap.end())
return llvm::make_error<llvm::StringError>(llvm::errc::invalid_argument,
"Id not bound: " + Id);
return It->second;
}
namespace {
// An arbitrary fragment of code within a stencil.
struct RawTextData {
explicit RawTextData(std::string T) : Text(std::move(T)) {}
std::string Text;
};
// A debugging operation to dump the AST for a particular (bound) AST node.
struct DebugPrintNodeOpData {
explicit DebugPrintNodeOpData(std::string S) : Id(std::move(S)) {}
std::string Id;
};
// The fragment of code corresponding to the selected range.
struct SelectorOpData {
explicit SelectorOpData(RangeSelector S) : Selector(std::move(S)) {}
RangeSelector Selector;
};
} // namespace
bool isEqualData(const RawTextData &A, const RawTextData &B) {
return A.Text == B.Text;
}
bool isEqualData(const DebugPrintNodeOpData &A, const DebugPrintNodeOpData &B) {
return A.Id == B.Id;
}
// Equality is not (yet) defined for \c RangeSelector.
bool isEqualData(const SelectorOpData &, const SelectorOpData &) { return false; }
// The `evalData()` overloads evaluate the given stencil data to a string, given
// the match result, and append it to `Result`. We define an overload for each
// type of stencil data.
Error evalData(const RawTextData &Data, const MatchFinder::MatchResult &,
std::string *Result) {
Result->append(Data.Text);
return Error::success();
}
Error evalData(const DebugPrintNodeOpData &Data,
const MatchFinder::MatchResult &Match, std::string *Result) {
std::string Output;
llvm::raw_string_ostream Os(Output);
auto NodeOrErr = getNode(Match.Nodes, Data.Id);
if (auto Err = NodeOrErr.takeError())
return Err;
NodeOrErr->print(Os, PrintingPolicy(Match.Context->getLangOpts()));
*Result += Os.str();
return Error::success();
}
Error evalData(const SelectorOpData &Data, const MatchFinder::MatchResult &Match,
std::string *Result) {
auto Range = Data.Selector(Match);
if (!Range)
return Range.takeError();
*Result += getText(*Range, *Match.Context);
return Error::success();
}
template <typename T>
class StencilPartImpl : public StencilPartInterface {
T Data;
public:
template <typename... Ps>
explicit StencilPartImpl(Ps &&... Args)
: StencilPartInterface(StencilPartImpl::typeId()),
Data(std::forward<Ps>(Args)...) {}
// Generates a unique identifier for this class (specifically, one per
// instantiation of the template).
static const void* typeId() {
static bool b;
return &b;
}
Error eval(const MatchFinder::MatchResult &Match,
std::string *Result) const override {
return evalData(Data, Match, Result);
}
bool isEqual(const StencilPartInterface &Other) const override {
if (const auto *OtherPtr = down_cast<StencilPartImpl>(&Other))
return isEqualData(Data, OtherPtr->Data);
return false;
}
};
namespace {
using RawText = StencilPartImpl<RawTextData>;
using DebugPrintNodeOp = StencilPartImpl<DebugPrintNodeOpData>;
using SelectorOp = StencilPartImpl<SelectorOpData>;
} // namespace
StencilPart Stencil::wrap(StringRef Text) {
return stencil::text(Text);
}
StencilPart Stencil::wrap(RangeSelector Selector) {
return stencil::selection(std::move(Selector));
}
void Stencil::append(Stencil OtherStencil) {
for (auto &Part : OtherStencil.Parts)
Parts.push_back(std::move(Part));
}
llvm::Expected<std::string>
Stencil::eval(const MatchFinder::MatchResult &Match) const {
std::string Result;
for (const auto &Part : Parts)
if (auto Err = Part.eval(Match, &Result))
return std::move(Err);
return Result;
}
StencilPart stencil::text(StringRef Text) {
return StencilPart(std::make_shared<RawText>(Text));
}
StencilPart stencil::selection(RangeSelector Selector) {
return StencilPart(std::make_shared<SelectorOp>(std::move(Selector)));
}
StencilPart stencil::dPrint(StringRef Id) {
return StencilPart(std::make_shared<DebugPrintNodeOp>(Id));
}
|
