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use crate::utils::*;
use lazy_static::lazy_static;
use regex::Regex;
use serde::{Deserializer, Serializer};
use std::fmt::{Debug, Display, Formatter};
#[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());
}
#[test]
fn test_to_json() {
let id = UUID4::random();
let str = serde_json::to_string(&id).expect("should serialize fine");
assert_eq!(str, format!("\"{}\"", id.to_string()))
}
#[test]
fn test_from_json() {
let id = UUID4::random();
let json = format!("\"{}\"", id.to_string());
let deserialized: UUID4 = serde_json::from_str(json.as_str()).expect("should read fine");
assert_eq!(deserialized, id);
}
}
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