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
|
//! The module contains [`Peaker`] trait and its implementations to be used in [`Height`] and [`Width`].
//!
//! [`Width`]: crate::settings::width::Width
//! [`Height`]: crate::settings::height::Height
/// A strategy of width function.
/// It determines the order how the function is applied.
pub trait Peaker {
/// Creates a new instance.
fn create() -> Self;
/// This function returns a column index which will be changed.
/// Or `None` if no changes are necessary.
fn peak(&mut self, min_widths: &[usize], widths: &[usize]) -> Option<usize>;
}
/// A Peaker which goes over column 1 by 1.
#[derive(Debug, Default, Clone)]
pub struct PriorityNone {
i: usize,
}
impl Peaker for PriorityNone {
fn create() -> Self {
Self { i: 0 }
}
fn peak(&mut self, _: &[usize], widths: &[usize]) -> Option<usize> {
let mut i = self.i;
let mut count_empty = 0;
while widths[i] == 0 {
i += 1;
if i >= widths.len() {
i = 0;
}
count_empty += 1;
if count_empty == widths.len() {
return None;
}
}
let col = i;
i += 1;
if i >= widths.len() {
i = 0;
}
self.i = i;
Some(col)
}
}
/// A Peaker which goes over the biggest column first.
#[derive(Debug, Default, Clone)]
pub struct PriorityMax;
impl Peaker for PriorityMax {
fn create() -> Self {
Self
}
fn peak(&mut self, _: &[usize], widths: &[usize]) -> Option<usize> {
let col = (0..widths.len()).max_by_key(|&i| widths[i]).unwrap();
if widths[col] == 0 {
None
} else {
Some(col)
}
}
}
/// A Peaker which goes over the smallest column first.
#[derive(Debug, Default, Clone)]
pub struct PriorityMin;
impl Peaker for PriorityMin {
fn create() -> Self {
Self
}
fn peak(&mut self, min_widths: &[usize], widths: &[usize]) -> Option<usize> {
let col = (0..widths.len())
.filter(|&i| min_widths.is_empty() || widths[i] > min_widths[i])
.min_by_key(|&i| widths[i])
.unwrap();
if widths[col] == 0 {
None
} else {
Some(col)
}
}
}
|
