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
| //===--- FormattedString.cpp --------------------------------*- 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 "FormattedString.h"
#include "clang/Basic/CharInfo.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormatVariadic.h"
#include <cstddef>
#include <string>
namespace clang {
namespace clangd {
namespace {
/// Escape a markdown text block. Ensures the punctuation will not introduce
/// any of the markdown constructs.
static std::string renderText(llvm::StringRef Input) {
// Escaping ASCII punctiation ensures we can't start a markdown construct.
constexpr llvm::StringLiteral Punctuation =
R"txt(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~)txt";
std::string R;
for (size_t From = 0; From < Input.size();) {
size_t Next = Input.find_first_of(Punctuation, From);
R += Input.substr(From, Next - From);
if (Next == llvm::StringRef::npos)
break;
R += "\\";
R += Input[Next];
From = Next + 1;
}
return R;
}
/// Renders \p Input as an inline block of code in markdown. The returned value
/// is surrounded by backticks and the inner contents are properly escaped.
static std::string renderInlineBlock(llvm::StringRef Input) {
std::string R;
// Double all backticks to make sure we don't close the inline block early.
for (size_t From = 0; From < Input.size();) {
size_t Next = Input.find("`", From);
R += Input.substr(From, Next - From);
if (Next == llvm::StringRef::npos)
break;
R += "``"; // double the found backtick.
From = Next + 1;
}
// If results starts with a backtick, add spaces on both sides. The spaces
// are ignored by markdown renderers.
if (llvm::StringRef(R).startswith("`") || llvm::StringRef(R).endswith("`"))
return "` " + std::move(R) + " `";
// Markdown render should ignore first and last space if both are there. We
// add an extra pair of spaces in that case to make sure we render what the
// user intended.
if (llvm::StringRef(R).startswith(" ") && llvm::StringRef(R).endswith(" "))
return "` " + std::move(R) + " `";
return "`" + std::move(R) + "`";
}
/// Render \p Input as markdown code block with a specified \p Language. The
/// result is surrounded by >= 3 backticks. Although markdown also allows to use
/// '~' for code blocks, they are never used.
static std::string renderCodeBlock(llvm::StringRef Input,
llvm::StringRef Language) {
// Count the maximum number of consecutive backticks in \p Input. We need to
// start and end the code block with more.
unsigned MaxBackticks = 0;
unsigned Backticks = 0;
for (char C : Input) {
if (C == '`') {
++Backticks;
continue;
}
MaxBackticks = std::max(MaxBackticks, Backticks);
Backticks = 0;
}
MaxBackticks = std::max(Backticks, MaxBackticks);
// Use the corresponding number of backticks to start and end a code block.
std::string BlockMarker(/*Repeat=*/std::max(3u, MaxBackticks + 1), '`');
return BlockMarker + Language.str() + "\n" + Input.str() + "\n" + BlockMarker;
}
} // namespace
void FormattedString::appendText(std::string Text) {
Chunk C;
C.Kind = ChunkKind::PlainText;
C.Contents = Text;
Chunks.push_back(C);
}
void FormattedString::appendCodeBlock(std::string Code, std::string Language) {
Chunk C;
C.Kind = ChunkKind::CodeBlock;
C.Contents = std::move(Code);
C.Language = std::move(Language);
Chunks.push_back(std::move(C));
}
void FormattedString::appendInlineCode(std::string Code) {
Chunk C;
C.Kind = ChunkKind::InlineCodeBlock;
C.Contents = std::move(Code);
Chunks.push_back(std::move(C));
}
std::string FormattedString::renderAsMarkdown() const {
std::string R;
auto EnsureWhitespace = [&R]() {
// Adds a space for nicer rendering.
if (!R.empty() && !isWhitespace(R.back()))
R += " ";
};
for (const auto &C : Chunks) {
switch (C.Kind) {
case ChunkKind::PlainText:
if (!C.Contents.empty() && !isWhitespace(C.Contents.front()))
EnsureWhitespace();
R += renderText(C.Contents);
continue;
case ChunkKind::InlineCodeBlock:
EnsureWhitespace();
R += renderInlineBlock(C.Contents);
continue;
case ChunkKind::CodeBlock:
if (!R.empty() && !llvm::StringRef(R).endswith("\n"))
R += "\n";
R += renderCodeBlock(C.Contents, C.Language);
R += "\n";
continue;
}
llvm_unreachable("unhanlded ChunkKind");
}
return R;
}
std::string FormattedString::renderAsPlainText() const {
std::string R;
auto EnsureWhitespace = [&]() {
if (R.empty() || isWhitespace(R.back()))
return;
R += " ";
};
Optional<bool> LastWasBlock;
for (const auto &C : Chunks) {
bool IsBlock = C.Kind == ChunkKind::CodeBlock;
if (LastWasBlock.hasValue() && (IsBlock || *LastWasBlock))
R += "\n\n";
LastWasBlock = IsBlock;
switch (C.Kind) {
case ChunkKind::PlainText:
EnsureWhitespace();
R += C.Contents;
break;
case ChunkKind::InlineCodeBlock:
EnsureWhitespace();
R += C.Contents;
break;
case ChunkKind::CodeBlock:
R += C.Contents;
break;
}
// Trim trailing whitespace in chunk.
while (!R.empty() && isWhitespace(R.back()))
R.pop_back();
}
return R;
}
std::string FormattedString::renderForTests() const {
std::string R;
for (const auto &C : Chunks) {
switch (C.Kind) {
case ChunkKind::PlainText:
R += "text[" + C.Contents + "]";
break;
case ChunkKind::InlineCodeBlock:
R += "code[" + C.Contents + "]";
break;
case ChunkKind::CodeBlock:
if (!R.empty())
R += "\n";
R += llvm::formatv("codeblock({0}) [\n{1}\n]\n", C.Language, C.Contents);
break;
}
}
while (!R.empty() && isWhitespace(R.back()))
R.pop_back();
return R;
}
} // namespace clangd
} // namespace clang
|