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
| // 用枚举表示颜色
enum Color {
Red,
Yellow,
}
// 实现响应的方法
impl Color {
fn to_fg_str(&self) -> &str {
match *self {
Color::Red => "31",
Color::Yellow => "33",
}
}
fn to_bg_str(&self) -> &str {
match *self {
Color::Red => "41",
Color::Yellow => "43",
}
}
}
use std::convert::From;
use std::str::FromStr;
use std::string::String;
impl<'a> From<&'a str> for Color {
fn from(src: &str) -> Self {
src.parse().unwrap_or(Color::Red)
}
}
impl From<String> for Color {
fn from(src: String) -> Self {
src.parse().unwrap_or(Color::Red)
}
}
impl FromStr for Color {
type Err = ();
fn from_str(src: &str) -> Result<Self, Self::Err> {
let src = src.to_lowercase();
match src.as_ref() {
"red" => Ok(Color::Red),
"yellow" => Ok(Color::Yellow),
_ => Err(()),
}
}
}
struct ColoredString {
input: String,
fgcolor: Option<Color>,
bgcolor: Option<Color>,
}
trait Colorize {
fn red(self) -> ColoredString;
fn yellow(self) -> ColoredString;
fn color<S: Into<Color>>(self, color: S) -> ColoredString;
fn on_red(self) -> ColoredString;
fn on_yellow(self) -> ColoredString;
fn on_color<S: Into<Color>>(self, color: S) -> ColoredString;
}
// 实现默认方法
impl Default for ColoredString {
fn default() -> Self {
ColoredString {
input: String::default(),
fgcolor: None,
bgcolor: None,
}
}
}
// 为 ColoredString 实现 Colorize trait
impl<'a> Colorize for ColoredString {
fn red(self) -> ColoredString {
self.color(Color::Red)
}
fn yellow(self) -> ColoredString {
self.color(Color::Yellow)
}
fn on_red(self) -> ColoredString {
self.on_color(Color::Red)
}
fn on_yellow(self) -> ColoredString {
self.on_color(Color::Yellow)
}
fn color<S: Into<Color>>(self, color: S) -> ColoredString {
ColoredString {
fgcolor: Some(color.into()),
..self
}
}
fn on_color<S: Into<Color>>(self, color: S) -> ColoredString {
ColoredString {
bgcolor: Some(color.into()),
..self
}
}
}
impl<'a> Colorize for &'a str {
fn red(self) -> ColoredString {
self.color(Color::Red)
}
fn yellow(self) -> ColoredString {
self.color(Color::Yellow)
}
fn on_red(self) -> ColoredString {
self.on_color(Color::Red)
}
fn on_yellow(self) -> ColoredString {
self.on_color(Color::Yellow)
}
fn color<S: Into<Color>>(self, color: S) -> ColoredString {
ColoredString {
fgcolor: Some(color.into()),
input: String::from(self),
..ColoredString::default()
}
}
fn on_color<S: Into<Color>>(self, color: S) -> ColoredString {
ColoredString {
bgcolor: Some(color.into()),
input: String::from(self),
..ColoredString::default()
}
}
}
impl ColoredString {
fn compute_style(&self) -> String {
let mut res = String::from("\x1B[");
let mut has_wrote = false;
if let Some(ref bgcolor) = self.bgcolor {
res.push_str(bgcolor.to_bg_str());
has_wrote = true;
}
if let Some(ref fgcolor) = self.fgcolor {
if has_wrote {
res.push_str(";");
}
res.push_str(fgcolor.to_fg_str());
}
res.push('m');
res
}
}
use std::fmt;
impl fmt::Display for ColoredString {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str(&self.compute_style())?;
f.write_str(&self.input)?;
f.write_str("\x1B[0m")?;
Ok(())
}
}
fn main() {
let hi = "Hello".red().on_yellow();
println!("{}", hi);
}
|