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
use std::{
collections::HashMap,
fmt::{self, Display, Formatter},
iter,
rc::Rc,
};
use log::error;
#[derive(Default, Debug, PartialEq, Eq, Hash)]
pub struct Tag {
name: Rc<String>,
prefixes: Vec<Rc<String>>,
}
impl Tag {
pub fn new(name: Rc<String>, prefixes: Vec<Rc<String>>) -> Self {
Self { name, prefixes }
}
pub fn get_name(&self) -> Rc<String> {
self.name.clone()
}
pub fn get_prefixes(&self) -> &Vec<Rc<String>> {
&self.prefixes
}
}
#[derive(Default, Debug)]
pub struct Element {
tag: Tag,
attrs: HashMap<String, String>,
children: Vec<Element>,
level: u32,
}
impl Element {
pub fn new(tag: Tag, attrs: HashMap<String, String>) -> Self {
Self {
tag,
attrs,
children: Vec::new(),
level: 0,
}
}
pub fn append(&mut self, element: Self) {
self.children.push(element)
}
pub fn set_level(&mut self, level: u32) {
self.level = level;
}
pub fn get_attributes(&self) -> &HashMap<String, String> {
&self.attrs
}
pub fn get_tag(&self) -> &Tag {
&self.tag
}
pub fn get_children(&self) -> &Vec<Self> {
&self.children
}
}
impl Display for Element {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), fmt::Error> {
let tabs = iter::repeat("\t")
.take(self.level as usize)
.collect::<String>();
writeln!(formatter, "{}Element: {}", tabs, self.tag.get_name())?;
for c in &self.children {
write!(formatter, "{}", c)?;
}
Ok(())
}
}
#[derive(Default, Debug)]
pub struct ElementContainer {
stack: Vec<Element>,
root: Option<Element>,
}
impl ElementContainer {
pub fn start_element(&mut self, mut element: Element) {
element.set_level(self.stack.len() as u32);
self.stack.push(element);
}
pub fn end_element(&mut self) {
self.stack
.pop()
.and_then(|element| {
if self.stack.is_empty() {
self.root = Some(element);
} else {
let last_element = self.stack.len();
self.stack[last_element - 1].append(element);
}
Some(())
})
.unwrap_or_else(|| {
error!("Received an end element event with an empty stack");
});
}
pub fn get_root(&self) -> &Option<Element> {
&self.root
}
}