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
|
//! Title occurs in [definition][] and label end.
//!
//! They’re formed with the following BNF:
//!
//! ```bnf
//! ; Restriction: no blank lines.
//! ; Restriction: markers must match (in case of `(` with `)`).
//! title ::= marker [ *( code - '\\' | '\\' [ marker ] ) ] marker
//! marker ::= '"' | '\'' | '('
//! ```
//!
//! Titles can be double quoted (`"a"`), single quoted (`'a'`), or
//! parenthesized (`(a)`).
//!
//! Titles can contain line endings and whitespace, but they are not allowed to
//! contain blank lines.
//! They are allowed to be blank themselves.
//!
//! The title is interpreted as the [string][] content type.
//! That means that character escapes and character reference are allowed.
//!
//! ## References
//!
//! * [`micromark-factory-title/index.js` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-factory-title/dev/index.js)
//!
//! [definition]: crate::construct::definition
//! [string]: crate::content::string
//!
//! <!-- To do: link label end. -->
// To do: pass token types in.
use crate::construct::partial_whitespace::start as whitespace;
use crate::tokenizer::{Code, State, StateFnResult, TokenType, Tokenizer};
/// Type of title.
#[derive(Debug, Clone, PartialEq)]
enum Kind {
/// In a parenthesized (`(` and `)`) title.
Paren,
/// In a double quoted (`"`) title.
Double,
/// In a single quoted (`'`) title.
Single,
}
/// Display a marker.
fn kind_to_marker(kind: &Kind) -> char {
match kind {
Kind::Double => '"',
Kind::Single => '\'',
Kind::Paren => ')',
}
}
/// Before a title.
///
/// ```markdown
/// |"a"
/// |'a'
/// |(a)
/// ```
pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
let kind = match code {
Code::Char('"') => Some(Kind::Double),
Code::Char('\'') => Some(Kind::Single),
Code::Char('(') => Some(Kind::Paren),
_ => None,
};
if let Some(kind) = kind {
tokenizer.enter(TokenType::DefinitionTitle);
tokenizer.enter(TokenType::DefinitionTitleMarker);
tokenizer.consume(code);
tokenizer.exit(TokenType::DefinitionTitleMarker);
(State::Fn(Box::new(|t, c| begin(t, c, kind))), None)
} else {
(State::Nok, None)
}
}
/// After the opening marker.
///
/// This is also used when at the closing marker.
///
/// ```markdown
/// "|a"
/// '|a'
/// (|a)
/// ```
fn begin(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind_to_marker(&kind) => {
tokenizer.enter(TokenType::DefinitionTitleMarker);
tokenizer.consume(code);
tokenizer.exit(TokenType::DefinitionTitleMarker);
tokenizer.exit(TokenType::DefinitionTitle);
(State::Ok, None)
}
_ => {
tokenizer.enter(TokenType::DefinitionTitleString);
at_break(tokenizer, code, kind)
}
}
}
/// At something, before something else.
///
/// ```markdown
/// "|a"
/// 'a|'
/// (a|
/// b)
/// ```
fn at_break(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind_to_marker(&kind) => {
tokenizer.exit(TokenType::DefinitionTitleString);
begin(tokenizer, code, kind)
}
Code::None => (State::Nok, None),
Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => {
tokenizer.enter(TokenType::LineEnding);
tokenizer.consume(code);
tokenizer.exit(TokenType::LineEnding);
(State::Fn(Box::new(|t, c| line_start(t, c, kind))), None)
}
_ => {
// To do: link.
tokenizer.enter(TokenType::ChunkString);
title(tokenizer, code, kind)
}
}
}
/// After a line ending.
///
/// ```markdown
/// "a
/// |b"
/// ```
fn line_start(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
tokenizer.attempt(
|t, c| whitespace(t, c, TokenType::Whitespace),
|_ok| Box::new(|t, c| line_begin(t, c, kind)),
)(tokenizer, code)
}
/// After a line ending, after optional whitespace.
///
/// ```markdown
/// "a
/// |b"
/// ```
fn line_begin(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
// Blank line not allowed.
Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => (State::Nok, None),
_ => at_break(tokenizer, code, kind),
}
}
/// In title text.
///
/// ```markdown
/// "a|b"
/// ```
fn title(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind_to_marker(&kind) => {
tokenizer.exit(TokenType::ChunkString);
at_break(tokenizer, code, kind)
}
Code::None | Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => {
tokenizer.exit(TokenType::ChunkString);
at_break(tokenizer, code, kind)
}
Code::Char('\\') => {
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| escape(t, c, kind))), None)
}
_ => {
tokenizer.consume(code);
(State::Fn(Box::new(|t, c| title(t, c, kind))), None)
}
}
}
/// After `\`, in title text.
///
/// ```markdown
/// "a\|"b"
/// ```
fn escape(tokenizer: &mut Tokenizer, code: Code, kind: Kind) -> StateFnResult {
match code {
Code::Char(char) if char == kind_to_marker(&kind) => {
tokenizer.consume(code);
(State::Fn(Box::new(move |t, c| title(t, c, kind))), None)
}
_ => title(tokenizer, code, kind),
}
}
|
