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use crate::prelude::*;
#[derive(Debug,Copy,Clone,Display,Deref,Serialize,Deserialize,Into)]
#[derive(Eq,PartialEq,Ord,PartialOrd)]
#[display(fmt="{}", _0)]
#[serde(try_from="Raw", into="Raw")]
pub struct Version(Raw);
pub type Raw = u32;
impl Version {
pub const MIN: Version = Version(1);
pub const MAX: Version = Version(2);
pub const CURRENT: Version = Version::MAX;
}
impl Default for Version {
fn default() -> Self { Self(1) }
}
#[derive(Error,Debug,Copy,Clone,Serialize,Deserialize)]
#[derive(Eq,PartialEq,Ord,PartialOrd)]
#[error(r#"unsupported bundle, library or spec format version "format={0}""#)]
pub struct Unsupported(u32);
#[derive(Error,Debug,Copy,Clone,Serialize,Deserialize)]
pub struct Incompat<E> {
mformat: Version,
error: E,
}
impl<E> Display for Incompat<E> where E: Display {
#[throws(fmt::Error)]
fn fmt(&self, f: &mut fmt::Formatter) {
if self.mformat == 1 {
write!(f,
r#"{}: not supported in format 1, maybe you forgoot "format="#,
self.error)?;
} else {
write!(f,
r#"{}: not supported with "format={}""#,
self.error, self.mformat)?;
}
}
}
impl Version {
pub fn incompat<E>(self, error: E) -> Incompat<E> {
Incompat { mformat: self, error }
}
pub fn err_mapper<E>(self) -> impl Fn(E) -> Incompat<E> {
move |error| self.incompat(error)
}
}
#[derive(Error,Debug,Clone,Copy,Serialize,Deserialize)]
#[derive(Eq,PartialEq)]
pub enum VersionError {
#[error("{0}")]
Unsupported(#[from] Unsupported),
#[error("bad format version: {0}")]
Other(&'static str),
}
impl TryFrom<Raw> for Version {
type Error = Unsupported;
#[throws(Unsupported)]
fn try_from(raw: Raw) -> Self {
if raw >= *Self::MIN && raw <= *Self::MAX {
Version(raw)
} else {
throw!(Unsupported(raw));
}
}
}
impl Version {
#[throws(VersionError)]
pub fn try_from_integer<I>(i: I) -> Version
where I: num::Integer + ToPrimitive {
let v = i.to_u32().ok_or_else(|| MFVE::Other("integer out of range"))?;
v.try_into()?
}
}
impl FromStr for Version {
type Err = VersionError;
#[throws(VersionError)]
fn from_str(s: &str) -> Version {
let v: Raw = s.parse()
.map_err(|_| MFVE::Other("could not parse as ingeger"))?;
v.try_into()?
}
}
macro_rules! impl_compar_i32 { {
$(
impl $Trait:ident { fn $method:ident -> $out:ty; }
)*
} => {
$(
impl $Trait<i32> for Version {
fn $method(&self, rhs: &i32) -> $out {
let lhs = i64::from(self.0);
let rhs = i64::from(*rhs);
lhs.$method(&rhs)
}
}
)*
} }
impl_compar_i32! {
impl PartialEq { fn eq -> bool; }
impl PartialOrd { fn partial_cmp -> Option<Ordering>; }
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn ser_deser() {
#[derive(Debug,Deserialize,Serialize,Eq,PartialEq,Copy,Clone)]
struct S {
mformat: Version,
}
#[derive(Debug,Deserialize,Serialize,Eq,PartialEq,Copy,Clone)]
struct R {
mformat: Raw,
}
fn check(raw: Raw, exp: Result<Version, Unsupported>) {
let got = raw.try_into();
assert_eq!(&got,&exp);
let json_r = serde_json::to_string(&R { mformat: raw }).unwrap();
let deser: Result<S,_> = serde_json::from_str(&json_r);
assert_eq!{ exp.ok().map(|e| S { mformat: e }), deser.ok() }
if let Ok(got) = got {
let json_s = serde_json::to_string(&S { mformat: got }).unwrap();
assert_eq!{ json_s, json_r }
}
}
let eus = |raw| Err(Unsupported(raw));
check(0, eus(0));
check(1, Ok(Version(1)));
check(2, Ok(Version(2)));
check(3, eus(03));
}
#[test]
fn compar() {
let one = Version::try_from(1).unwrap();
assert!{ one > 0 } assert!{ !( one <= 0 ) }
assert!{ one >= 1 } assert!{ !( one < 1 ) }
assert!{ one == 1 } assert!{ !( one != 1 ) }
assert!{ one <= 1 } assert!{ !( one > 1 ) }
assert!{ one < 2 } assert!{ !( one >= 2 ) }
}
}
