7 unstable releases
0.4.2 | Oct 8, 2022 |
---|---|
0.4.1 | Nov 8, 2021 |
0.3.1 | Nov 5, 2021 |
0.2.1 | Nov 4, 2021 |
0.1.0 | Mar 11, 2021 |
#2 in #mapped
8KB
98 lines
StructMapper
A library to help you generate code that mapped one struct to another.
Example
Generate From<T>
use structmapper::StructMapper;
struct From1 {
base: i32,
value: i32,
}
struct From2 {
value: i32,
}
struct From3 {
value: i32,
}
#[derive(StructMapper)]
#[struct_mapper(from_type = "From1", fields(base = "Default::default()"))]
#[struct_mapper(from_type = "From2", fields(base = "Default::default()"))]
#[struct_mapper(
from_type = "(From1, From2, From3)",
default_base = "{0}",
fields(value = "{0.value} + {1.value} + {2.value}")
)]
struct To {
base: i32,
value: i32,
}
let to = To::from(From1 { base: 0, value: 1 });
assert_eq!(to.value, 1);
let to = To::from(From2 { value: 2 });
assert_eq!(to.value, 2);
let to = To::from((
From1 { base: 42, value: 1 },
From2 { value: 2 },
From3 { value: 3 },
));
assert_eq!(to.base, 42);
assert_eq!(to.value, 1 + 2 + 3);
Generate Into<T>
use structmapper::StructMapper;
struct Into1 {
base: i32,
value: i32,
}
struct Into2 {
base: i32,
value: i32,
}
struct Into3 {
value: i32,
}
#[derive(StructMapper)]
#[struct_mapper(into_type = "Into1")]
#[struct_mapper(into_type = "Into2", fields(base = "Default::default()"))]
#[struct_mapper(into_type = "Into3", ignore(base))]
struct From {
base: i32,
value: i32,
}
let to: Into1 = From { base: 1111, value: 1 }.into();
assert_eq!(to.base, 1111);
assert_eq!(to.value, 1);
let to: Into2 = From { base: 123, value: 1 }.into();
assert_eq!(to.base, 0);
assert_eq!(to.value, 1);
let to: Into3 = From { base: 0, value: 2 }.into();
assert_eq!(to.value, 2);
Enums
use structmapper::StructMapper;
#[derive(Debug, PartialEq, Eq)]
enum Enum1 {
A,
B,
}
#[derive(Debug, PartialEq, Eq, StructMapper)]
#[struct_mapper(from_type = "Enum1")]
#[struct_mapper(into_type = "Enum1")]
enum Enum2 {
A,
B,
}
let v: Enum1 = Enum2::A.into();
assert_eq!(v, Enum1::A);
let v: Enum2 = Enum2::from(Enum1::B);
assert_eq!(v, Enum2::B);
Dependencies
~1.5MB
~36K SLoC