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 crate::bytes::Bytes;
use crate::ChoicesResult;
use std::fmt::Display;
use std::str;
pub trait ChoicesOutput {
fn body_string(&self) -> String;
}
macro_rules! default_choices_output_impl {
($($ty:ident),*) => {
$(impl ChoicesOutput for $ty {
fn body_string(&self) -> String {
format!("{}", &self)
}
})*
};
}
default_choices_output_impl! {bool, char, i128, i16, i32, i64, i8, u128, u16, u32, u64, u8, f32, f64, usize, isize}
impl ChoicesOutput for &str {
fn body_string(&self) -> String {
self.to_string()
}
}
impl ChoicesOutput for String {
fn body_string(&self) -> String {
self.clone()
}
}
impl<T: Display> ChoicesOutput for Option<T> {
fn body_string(&self) -> String {
match self {
Some(v) => format!("{}", v),
None => "".to_string(),
}
}
}
pub trait ChoicesInput<'a> {
fn from_chars(bytes: &'a Bytes) -> ChoicesResult<Self>
where
Self: Sized;
}
macro_rules! default_choices_input_impl {
($($ty:ident),*) => {
$(impl ChoicesInput<'_> for $ty {
fn from_chars(bytes: &Bytes) -> ChoicesResult<Self> {
let chars = str::from_utf8(&bytes)?;
Ok(chars.parse::<Self>()?)
}
})*
};
}
default_choices_input_impl! {bool, char, i128, i16, i32, i64, i8, u128, u16, u32, u64, u8, f32, f64, usize, isize}
impl<'a> ChoicesInput<'a> for &'a str {
fn from_chars(bytes: &'a Bytes) -> ChoicesResult<Self> {
Ok(str::from_utf8(&bytes)?)
}
}
impl ChoicesInput<'_> for String {
fn from_chars(bytes: &Bytes) -> ChoicesResult<Self> {
Ok(String::from_utf8(bytes.to_vec())?)
}
}
impl<'a, T: Display + ChoicesInput<'a>> ChoicesInput<'a> for Option<T> {
fn from_chars(bytes: &'a Bytes) -> ChoicesResult<Self> {
if bytes.is_empty() {
Ok(None)
} else {
Ok(Some(T::from_chars(bytes)?))
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::bytes::{BufMut, BytesMut};
#[test]
fn generic_number_from_chars() {
let i: u16 = 56;
let mut buf = BytesMut::with_capacity(16);
buf.put_slice(i.to_string().as_bytes());
let buf = buf.freeze();
assert_eq!(u16::from_chars(&buf), Ok(i));
}
#[test]
fn option_from_chars() {
let i: u16 = 56;
let mut buf = BytesMut::with_capacity(16);
buf.put_slice(i.to_string().as_bytes());
let buf = buf.freeze();
assert_eq!(Option::<u16>::from_chars(&buf), Ok(Some(i)));
let buf = BytesMut::with_capacity(16);
assert_eq!(Option::<u16>::from_chars(&buf.freeze()), Ok(None));
}
}