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
use crate::LookAheadItems;
use std::fmt;
impl<T> LookAheadItems<T>
where
T: std::clone::Clone,
{
pub fn new(index: usize, items: &Vec<T>) -> Self {
LookAheadItems {
items: items.clone(),
index: index,
}
}
pub fn get(&self, index: usize) -> Option<&T> {
if index < self.items.len() {
return Some(&self.items[index]);
}
None
}
pub fn get_items(&self) -> &Vec<T> {
&self.items
}
}
impl<T> fmt::Display for LookAheadItems<T>
where
T: std::fmt::Display + std::clone::Clone,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut buf = String::new();
for item in &self.items {
buf.push_str(&format!("{}", item));
}
write!(f, "{}", buf)
}
}
impl<T> fmt::Debug for LookAheadItems<T>
where
T: std::fmt::Debug + std::clone::Clone,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut buf = String::new();
for item in &self.items {
buf.push_str(&format!("{:?}", item));
}
write!(f, "{}", buf)
}
}