3 releases
0.1.2 | Feb 16, 2023 |
---|---|
0.1.1 | Feb 11, 2023 |
0.1.0 | Aug 22, 2022 |
#6 in #flattening
15KB
204 lines
serde_flat_regex
A small macro for flattening a map type with regex machting keys.
Example
#[flat_regex]
#[derive(Debug, Deserialize)]
struct RouterStatus {
id: u32,
wifi_status: bool,
#[flat_regex(regex = r"lanportstatus_\d+")]
lanports: std::collections::HashMap<String, String>,
}
#[test]
fn json_test() {
let raw = r#"{
"id": 1,
"wifi_status": true,
"lanportstatus_0": "UP",
"lanportstatus_1": "UP",
"lanportstatus_2": "DOWN",
"lanportspeed": "100"
}"#;
let router_status: RouterStatus = serde_json::from_str(raw).unwrap();
assert_eq!(router_status.lanports.len(),3)
}
The key can be anything that implements AsRef<str>
or alternitiv the field attribute key_access
can be set with a function returning a Result<&str,_>
.
The function has to have the following signature: fn key_access_fn_name<T>(key: &T) -> Result<&str,Error>
where Error
can be any Errortype.
use std::collections::BTreeMap;
use std::str::Utf8Error;
use std::ffi::CString;
use serde_flat_regex::flat_regex;
use serde::Deserialize;
#[flat_regex]
#[derive(Debug,Deserialize)]
struct RouterStatus {
online: bool,
#[flat_regex(regex = r"lanportstatus_\d+",key_access = "c_string_as_str")]
lanport_status: BTreeMap<CString,bool>,
}
fn c_string_as_str(key: &CString) -> Result<&str,Utf8Error> {
key.to_str()
}
let json = serde_json::json!({
"online": true,
"lanportstatus_0": true,
"lanportspeed_0": "100", // no maching keys will be ignored
"lanportstatus_1": false,
"lanport_speed_1": "0", // no maching keys will be ignored
"wifistatus": true
});
let res: RouterStatus = serde_json::from_value(json).unwrap();
assert_eq!(res.lanport_status.len(),2)
Applicable Collections
The collection for flattening must be a serde-map type and implement Extend<(K,V)> + Default
.
Dependencies
~4–5MB
~99K SLoC