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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
#include "MDParser.h"
#include "clang/Basic/CharInfo.h"
#include "llvm/ADT/AllocatorList.h"
namespace clang {
namespace doc {
namespace {
bool isEmphasisDelimiter(char &Token) {
// TODO: support '_'
if (Token == '*')
return true;
return false;
}
} // namespace
std::pair<std::optional<DelimiterContext>, size_t>
MarkdownParser::processDelimiters(SmallString<64> &Line, const size_t &Origin) {
size_t Idx = Origin;
while (Idx < Line.size() && Line[Idx] == Line[Origin]) {
++Idx;
}
char Preceeding = (Origin == 0) ? ' ' : Line[Origin - 1];
char Proceeding = (Idx >= Line.size()) ? ' ' : Line[Idx];
bool LeftFlanking = !isWhitespace(Proceeding) &&
(!isPunctuation(Proceeding) || isWhitespace(Preceeding) ||
isPunctuation(Preceeding));
bool RightFlanking = !isWhitespace(Preceeding) &&
(!isPunctuation(Preceeding) || isWhitespace(Proceeding) ||
isPunctuation(Proceeding));
if (LeftFlanking && RightFlanking)
return {DelimiterContext{LeftFlanking, RightFlanking, true, true}, Idx};
if (LeftFlanking)
return {DelimiterContext{LeftFlanking, RightFlanking, true, false}, Idx};
if (RightFlanking)
return {DelimiterContext{LeftFlanking, RightFlanking, false, true}, Idx};
return {std::nullopt, 0};
}
Node *MarkdownParser::createTextNode(const std::list<LineNode *> &Text) {
Node *TextNode = new (Arena) Node();
for (const auto *Node : Text) {
TextNode->Content.append(Node->Content);
}
TextNode->Type = MDType::Text;
return TextNode;
}
Node *MarkdownParser::reverseIterateLine(std::list<LineNode *> &Stack,
std::list<LineNode *>::iterator &It) {
auto ReverseIt = std::make_reverse_iterator(It);
std::list<LineNode *> Text;
while (ReverseIt != Stack.rend()) {
auto *ReverseCurrent = *ReverseIt;
if (!ReverseCurrent->DelimiterContext && !ReverseCurrent->Content.empty()) {
Text.push_back(ReverseCurrent);
ReverseIt++;
continue;
}
if (ReverseCurrent->DelimiterContext &&
ReverseCurrent->DelimiterContext->CanOpen) {
if (Text.empty()) {
// If there is no text between the runs, there is no emphasis, so both
// delimiter runs are literal text.
auto *DelimiterTextNode = new (Arena) Node();
DelimiterTextNode->Content =
Saver.save((*It)->Content + ReverseCurrent->Content);
DelimiterTextNode->Type = MDType::Text;
return DelimiterTextNode;
}
Node *Emphasis = nullptr;
auto &Closer = (*It)->DelimiterContext;
auto &Opener = ReverseCurrent->DelimiterContext;
if (Closer->Length >= 2 && Opener->Length >= 2) {
// We have at least one strong node.
Closer->Length -= 2;
Opener->Length -= 2;
Emphasis = new (Arena) Node();
Emphasis->Type = MDType::Strong;
auto *Child = createTextNode(Text);
Child->Parent = Emphasis;
Emphasis->Children.push_back(Child);
} else if (Closer->Length == 1 && Opener->Length == 1) {
Closer->Length -= 1;
Opener->Length -= 1;
Emphasis = new (Arena) Node();
Emphasis->Type = MDType::Emphasis;
auto *Child = createTextNode(Text);
Child->Parent = Emphasis;
Emphasis->Children.push_back(Child);
}
if (Closer->Length == 0)
It = Stack.erase(It);
if (Opener->Length == 0)
ReverseIt = std::make_reverse_iterator(Stack.erase(ReverseIt.base()));
if (!Text.empty())
for (auto *Node : Text)
Stack.remove(Node);
return Emphasis;
}
ReverseIt++;
}
return nullptr;
}
std::list<Node *>
MarkdownParser::processEmphasis(std::list<LineNode *> &Stack) {
std::list<Node *> Result;
auto It = Stack.begin();
while (It != Stack.end()) {
LineNode *Current = *It;
if (Current->DelimiterContext && Current->DelimiterContext->CanClose) {
auto *NewNode = reverseIterateLine(Stack, It);
if (NewNode) {
Result.push_back(NewNode);
It = Stack.begin();
continue;
}
}
++It;
}
return Result;
}
void MarkdownParser::parseLine(SmallString<64> &Line, Node *Current) {
std::list<LineNode *> Stack;
BumpPtrAllocator LineArena;
size_t StrCount = 0;
size_t Idx = 0;
for (; Idx < Line.size(); ++Idx) {
if (isEmphasisDelimiter(Line[Idx])) {
auto DelimiterResult = processDelimiters(Line, Idx);
if (DelimiterResult.first != std::nullopt) {
if (StrCount > 0) {
auto *TextNode = new (LineArena) LineNode();
TextNode->Content = Line.substr(Idx - StrCount, StrCount);
Stack.push_back(TextNode);
StrCount = 0;
}
auto *NewNode = new (LineArena) LineNode();
NewNode->Content = Line.substr(Idx, DelimiterResult.second - Idx);
NewNode->DelimiterContext = std::move(DelimiterResult.first);
NewNode->DelimiterContext->Length = NewNode->Content.size();
Stack.push_back(NewNode);
Idx = DelimiterResult.second - 1;
continue;
}
}
// Not any emphasis delimiter, so it will be appended as a string later
StrCount += 1;
}
if (StrCount > 0) {
auto *TextNode = new (LineArena) LineNode();
TextNode->Content = Line.substr(Line.size() - StrCount, StrCount);
Stack.push_back(TextNode);
}
auto Resolved = processEmphasis(Stack);
for (auto *Node : Resolved) {
Node->Parent = Current;
Current->Children.push_back(Node);
}
}
Node *MarkdownParser::parse(std::vector<SmallString<64>> &Lines) {
auto *Root = new (Arena) Node();
Node *Current = Root;
for (auto &Line : Lines) {
if (Line.empty()) {
auto *Paragraph = new (Arena) Node();
Paragraph->Type = MDType::Paragraph;
Paragraph->Parent = Current;
Current->Children.push_back(Paragraph);
Current = Paragraph;
continue;
}
parseLine(Line, Current);
}
return Root;
}
std::string MarkdownParser::traverse(Node *Current) {
std::string Result;
switch (Current->Type) {
case MDType::Strong:
Result.append("<strong>");
for (auto *Child : Current->Children)
Result.append(traverse(Child));
Result.append("</strong>");
break;
case MDType::Text:
Result.append(Current->Content);
break;
case MDType::Softbreak:
Result.append("\n");
break;
case MDType::Paragraph:
Result.append("<p>");
for (auto *Child : Current->Children)
Result.append(traverse(Child));
Result.append("</p>");
break;
case MDType::Emphasis:
Result.append("<em>");
for (auto *Child : Current->Children)
Result.append(traverse(Child));
Result.append("</em>");
break;
}
return Result;
}
std::string MarkdownParser::render(std::vector<SmallString<64>> &Lines) {
auto *Document = parse(Lines);
std::string Result;
for (auto *Child : Document->Children)
Result.append(traverse(Child));
return Result;
}
} // namespace doc
} // namespace clang
|
