tanzim-source 0.9.0

Declarative configuration source (source, options, resource)
Documentation 
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

//! [`serde`] support (`serde` Cargo feature).
//!
//! [`Source`] serializes and deserializes as its canonical string form.

use crate::Source;
use serde::{
    Deserialize, Deserializer, Serialize, Serializer,
    de::{self, Visitor},
};
use std::fmt;

impl Serialize for Source {
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        serializer.serialize_str(&self.to_string())
    }
}

impl<'de> Deserialize<'de> for Source {
    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
        deserializer.deserialize_str(SourceVisitor)
    }
}

struct SourceVisitor;

impl<'de> Visitor<'de> for SourceVisitor {
    type Value = Source;

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        formatter.write_str("a configuration source string such as `env(prefix=APP)`")
    }

    fn visit_str<E: de::Error>(self, value: &str) -> Result<Self::Value, E> {
        Source::parse(value).map_err(|error| E::custom(error.to_string()))
    }

    fn visit_string<E: de::Error>(self, value: String) -> Result<Self::Value, E> {
        self.visit_str(value.as_str())
    }
}