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
|
use std::fmt::{Display, Formatter, Debug};
use lazy_static::lazy_static;
use regex::Regex;
use serde::{Serializer, Deserializer};
use crate::utils::*;
#[derive(Copy, Clone, PartialEq, Hash, Eq)]
pub struct UUID4 {
raw: u128
}
impl Display for UUID4 {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str(self.hex().as_str())
}
}
impl Debug for UUID4 {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str("UUID4{")?;
f.write_str(self.hex().as_str())?;
f.write_str("}")
}
}
impl From<u128> for UUID4 {
fn from(raw: u128) -> Self {
UUID4 {
raw
}
}
}
impl serde::Serialize for UUID4 {
fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error> where
S: Serializer {
serializer.serialize_str(self.to_string().as_str())
}
}
impl<'de> serde::Deserialize<'de> for UUID4 {
fn deserialize<D>(deserializer: D) -> Result<Self, <D as Deserializer<'de>>::Error> where
D: Deserializer<'de> {
struct Visitor;
impl serde::de::Visitor<'_> for Visitor {
type Value = UUID4;
fn expecting(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result {
write!(formatter, "a string representing the UUID")
}
fn visit_str<E: serde::de::Error>(self, v: &str) -> Result<Self::Value, E> {
if let Some(id) = UUID4::parse(v) {
Ok(id)
} else {
Err(serde::de::Error::invalid_value(serde::de::Unexpected::Str(v), &self))
}
}
}
deserializer.deserialize_str(Visitor{})
}
}
impl UUID4 {
pub fn parse(from: &str) -> Option<UUID4> {
const PATTERN: &str = r"^([A-Fa-f0-9]{8})-?([A-Fa-f0-9]{4})-?([A-Fa-f0-9]{4})-?([A-Fa-f0-9]{4})-?([A-Fa-f0-9]{12})$";
// let re = Regex::new(PATTERN).expect("regex is valid");
lazy_static! {
static ref RE: Regex = Regex::new(PATTERN)
.expect("regex is valid");
}
RE.captures_iter(from).filter_map(move |c|
c.get(1).map(move |g| g.as_str()).and_then(move |g0|
c.get(2).map(move |g| g.as_str()).and_then(move |g1|
c.get(3).map(move |g| g.as_str()).and_then(move |g2|
c.get(4).map(move |g| g.as_str()).and_then(move |g3|
c.get(5).map(move |g4|
RawUUID4 { parts: [g0, g1, g2, g3, g4.as_str()] }))))))
.nth(0)
.and_then(move |raw| raw.parse())
}
pub fn random() -> Self {
UUID4 {
raw: rand::random(),
}
}
pub fn to_u128(self) -> u128 {
self.raw
}
pub fn hex(self) -> String {
let bytes = self.raw.to_be_bytes();
let parts = [
hex(&bytes[..4]),
hex(&bytes[4..6]),
hex(&bytes[6..8]),
hex(&bytes[8..10]),
hex(&bytes[10..16]),
];
parts.join("-")
}
}
struct RawUUID4<'a> {
parts: [&'a str; 5],
}
impl<'a> RawUUID4<'a> {
fn parse(self) -> Option<UUID4> {
let mut bit_index: usize = 0;
let mut raw: u128 = 0;
for part in &self.parts {
for char in part.chars() {
if let Some(parsed) = parse_hex_char(char as u8) {
raw |= (parsed as u128) << (124 - bit_index);
bit_index += 4;
} else {
return None;
}
}
}
Some(UUID4 { raw })
}
}
#[cfg(test)]
mod tests {
use super::UUID4;
#[test]
fn test_random_uuid4() {
UUID4::random();
}
const VALID_UUID: &str = "e1cde35a-0758-47f6-adf8-9dcb44884e5d";
#[test]
fn test_uuid4_parse() {
UUID4::parse(VALID_UUID)
.expect("should parse valid uuid correctly");
}
#[test]
fn test_parsed_uuid4_to_hex() {
let uuid_hex =
UUID4::parse(VALID_UUID)
.expect("should parse valid uuid correctly")
.hex();
assert_eq!(uuid_hex.as_str(), VALID_UUID)
}
#[test]
fn test_uuid4_equal() {
let uuid_a = UUID4::parse(VALID_UUID).expect("should parse valid uuid correctly");
let uuid_b = UUID4::parse(VALID_UUID).expect("should parse valid uuid correctly");
assert_eq!(uuid_a, uuid_b);
}
#[test]
fn test_random_uuid4_hex() {
let src_uuid = UUID4::random();
let uuid_hex = src_uuid.hex();
let uuid_parsed = UUID4::parse(uuid_hex.as_str()).expect("should parse generated uuid correctly");
assert_eq!(src_uuid, uuid_parsed);
let uuid_parsed_hex = uuid_parsed.hex();
assert_eq!(uuid_hex, uuid_parsed_hex);
}
#[test]
fn test_display_uuid() {
println!("got uuid {}", UUID4::random());
}
#[test]
fn test_debug_uuid() {
println!("got uuid {:?}", UUID4::random());
}
}
|
