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
|
use crate::print::{Grapheme, UnicodeWidthGraphemes};
use ansi_term::{ANSIString, Style};
use std::fmt;
use unicode_segmentation::UnicodeSegmentation;
/// Type that holds text with an associated style
#[derive(Clone)]
pub struct TextSegment {
/// The segment's style. If None, will inherit the style of the module containing it.
style: Option<Style>,
/// The string value of the current segment.
value: String,
}
impl TextSegment {
// Returns the ANSIString of the segment value
fn ansi_string(&self) -> ANSIString {
match self.style {
Some(style) => style.paint(&self.value),
None => ANSIString::from(&self.value),
}
}
}
/// Type that holds fill text with an associated style
#[derive(Clone)]
pub struct FillSegment {
/// The segment's style. If None, will inherit the style of the module containing it.
style: Option<Style>,
/// The string value of the current segment.
value: String,
}
impl FillSegment {
// Returns the ANSIString of the segment value, not including its prefix and suffix
pub fn ansi_string(&self, width: Option<usize>) -> ANSIString {
let s = match width {
Some(w) => self
.value
.graphemes(true)
.cycle()
.scan(0usize, |len, g| {
*len += Grapheme(g).width();
if *len <= w {
Some(g)
} else {
None
}
})
.collect::<String>(),
None => String::from(&self.value),
};
match self.style {
Some(style) => style.paint(s),
None => ANSIString::from(s),
}
}
}
#[cfg(test)]
mod fill_seg_tests {
use super::FillSegment;
use ansi_term::Color;
#[test]
fn ansi_string_width() {
let width: usize = 10;
let style = Color::Blue.bold();
let inputs = vec![
(".", ".........."),
(".:", ".:.:.:.:.:"),
("-:-", "-:--:--:--"),
("🟦", "🟦🟦🟦🟦🟦"),
("🟢🔵🟡", "🟢🔵🟡🟢🔵"),
];
for (text, expected) in &inputs {
let f = FillSegment {
value: String::from(*text),
style: Some(style),
};
let actual = f.ansi_string(Some(width));
assert_eq!(style.paint(*expected), actual);
}
}
}
/// A segment is a styled text chunk ready for printing.
#[derive(Clone)]
pub enum Segment {
Text(TextSegment),
Fill(FillSegment),
LineTerm,
}
impl Segment {
/// Creates new segments from a text with a style; breaking out `LineTerminators`.
pub fn from_text<T>(style: Option<Style>, value: T) -> Vec<Self>
where
T: Into<String>,
{
let mut segs: Vec<Self> = Vec::new();
value.into().split(LINE_TERMINATOR).for_each(|s| {
if !segs.is_empty() {
segs.push(Self::LineTerm)
}
segs.push(Self::Text(TextSegment {
value: String::from(s),
style,
}))
});
segs
}
/// Creates a new fill segment
pub fn fill<T>(style: Option<Style>, value: T) -> Self
where
T: Into<String>,
{
Self::Fill(FillSegment {
style,
value: value.into(),
})
}
pub fn style(&self) -> Option<Style> {
match self {
Self::Fill(fs) => fs.style,
Self::Text(ts) => ts.style,
Self::LineTerm => None,
}
}
pub fn set_style_if_empty(&mut self, style: Option<Style>) {
match self {
Self::Fill(fs) => {
if fs.style.is_none() {
fs.style = style
}
}
Self::Text(ts) => {
if ts.style.is_none() {
ts.style = style
}
}
Self::LineTerm => {}
}
}
pub fn value(&self) -> &str {
match self {
Self::Fill(fs) => &fs.value,
Self::Text(ts) => &ts.value,
Self::LineTerm => LINE_TERMINATOR_STRING,
}
}
// Returns the ANSIString of the segment value, not including its prefix and suffix
pub fn ansi_string(&self) -> ANSIString {
match self {
Self::Fill(fs) => fs.ansi_string(None),
Self::Text(ts) => ts.ansi_string(),
Self::LineTerm => ANSIString::from(LINE_TERMINATOR_STRING),
}
}
pub fn width_graphemes(&self) -> usize {
match self {
Self::Fill(fs) => fs.value.width_graphemes(),
Self::Text(ts) => ts.value.width_graphemes(),
Self::LineTerm => 0,
}
}
}
const LINE_TERMINATOR: char = '\n';
const LINE_TERMINATOR_STRING: &str = "\n";
impl fmt::Display for Segment {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.ansi_string())
}
}
|
