procmeta_core/
converter.rs

1use syn::{LitBool, LitFloat, LitInt, LitStr, Result};
2
3pub trait Converter<T>: syn::parse::Parse {
4    fn convert(stream: &syn::parse::ParseStream) -> Result<T> {
5        let origin: Self = stream.parse()?;
6        Self::into(origin)
7    }
8    fn into(self) -> Result<T>;
9}
10
11impl<T, C: Converter<T>> Converter<Option<T>> for C {
12    fn into(self) -> Result<Option<T>> {
13        let result = C::into(self);
14        result.map(|v| Some(v))
15    }
16}
17
18impl Converter<String> for LitStr {
19    fn into(self) -> Result<String> {
20        Ok(self.value())
21    }
22}
23
24impl Converter<bool> for LitBool {
25    fn into(self) -> Result<bool> {
26        Ok(self.value)
27    }
28}
29
30impl Converter<f32> for LitFloat {
31    fn into(self) -> Result<f32> {
32        self.base10_parse()
33    }
34}
35
36impl Converter<f64> for LitFloat {
37    fn into(self) -> Result<f64> {
38        self.base10_parse()
39    }
40}
41
42impl Converter<i8> for LitInt {
43    fn into(self) -> Result<i8> {
44        self.base10_parse()
45    }
46}
47
48impl Converter<i16> for LitInt {
49    fn into(self) -> Result<i16> {
50        self.base10_parse()
51    }
52}
53
54impl Converter<i32> for LitInt {
55    fn into(self) -> Result<i32> {
56        self.base10_parse()
57    }
58}
59
60impl Converter<i64> for LitInt {
61    fn into(self) -> Result<i64> {
62        self.base10_parse()
63    }
64}
65
66impl Converter<usize> for LitInt {
67    fn into(self) -> Result<usize> {
68        self.base10_parse()
69    }
70}
procmeta_core/converter.rs

procmeta_core/
converter.rs
