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
|
use core::fmt;
use crate::Node;
#[derive(Clone, Debug, PartialEq)]
pub struct Tag {
pub name: String,
/// Everything inside the tag that's not it's name. Includes a
/// self-close if there is one.
pub body: Option<String>,
pub self_closing: bool,
pub children: Vec<Node>,
}
impl Tag {
pub fn self_closing(&self) -> bool {
self.self_closing
}
pub fn get_attribute<'a>(&'a self, key: &str) -> Option<&'a str> {
let body = match self.body.as_deref() {
None => return None,
Some(body) => body,
};
// get rid of potential self-close
let trimmed = if let Some(suffix) = body.trim().strip_suffix('/') {
suffix
} else {
body.trim()
};
let mut wrk = trimmed;
loop {
let key_end_idx = wrk.find(|c: char| c == ' ' || c == '=');
match key_end_idx {
None => {
// boolean ends body
if wrk == key {
return Some("");
} else {
break;
}
}
Some(idx) => match &wrk[idx..idx + 1] {
" " => {
// boolean
if &wrk[..idx] == key {
return Some("");
} else {
wrk = &wrk[idx + 1..];
}
}
"=" => {
// key-value
let found_name = &wrk[..idx];
// we're just assuming the attributes are properly
// formed right now. Skips the `=` and the `"` that
// should be there but we don't check for
wrk = &wrk[idx + 2..];
let end = wrk.find('"').unwrap();
let value = &wrk[..end];
wrk = &wrk[end + 1..].trim_start();
if found_name == key {
return Some(value);
}
}
_ => unreachable!(),
},
}
}
None
}
pub fn id(&self) -> Option<&str> {
match self.get_attribute("id") {
None => None,
Some("") => None,
Some(id) => Some(id),
}
}
pub fn has_class(&self, name: &str) -> bool {
match self.get_attribute("class") {
None => false,
Some(classes) => {
for class in classes.split(' ') {
if class == name {
return true;
}
}
false
}
}
}
pub fn append_child<N: Into<Node>>(&mut self, node: N) {
let node = node.into();
self.children.push(node);
}
/// Replace all children with one [Node::Text]
pub fn set_inner_text<S: Into<String>>(&mut self, txt: S) {
self.children = vec![Node::Text(txt.into())];
}
}
impl fmt::Display for Tag {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let Tag {
name,
body,
self_closing,
children,
} = self;
let formatted_body = if let Some(body) = body {
format!(" {body}")
} else {
String::from("")
};
if *self_closing {
// we ignore our children if we're self-closing.
write!(f, "<{name} {}/>", body.as_deref().unwrap_or_default())
} else {
write!(f, "<{name}{formatted_body}>")?;
for child in children {
write!(f, "{}", child)?;
}
write!(f, "</{name}>")
}
}
}
#[cfg(test)]
mod test {
use crate::Tag;
#[test]
fn tag_finds_boolen_attribute() {
let tag = Tag {
name: "div".into(),
body: Some("contenteditable".into()),
self_closing: false,
children: vec![],
};
assert!(tag.get_attribute("contenteditable").is_some())
}
#[test]
fn tag_finds_kv_attribute() {
let tag = Tag {
name: "script".into(),
body: Some("src=\"script.js\"".into()),
self_closing: false,
children: vec![],
};
assert_eq!(tag.get_attribute("src"), Some("script.js"))
}
#[test]
fn tag_finds_boolean_in_centre() {
let tag = Tag {
name: "div".into(),
body: Some("id=\"divy\" contenteditable style=\"display: none;\"".into()),
self_closing: false,
children: vec![],
};
assert!(tag.get_attribute("contenteditable").is_some());
}
}
|
