core-macros 0.0.2

Procedural macros for the Amico AI Agent Framework
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

use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, Data, DeriveInput, Fields};

#[proc_macro_derive(WithParams, attributes(params))]
pub fn derive_with_params(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    let name = &input.ident;

    // Find the field marked with #[params]
    let params_field = match &input.data {
        Data::Struct(data) => match &data.fields {
            Fields::Named(fields) => fields.named.iter().find(|field| {
                field
                    .attrs
                    .iter()
                    .any(|attr| attr.path().is_ident("params"))
            }),
            _ => panic!("WithParams can only be derived for structs with named fields"),
        },
        _ => panic!("WithParams can only be derived for structs"),
    };

    let params_field = params_field.expect("No field marked with #[params] found");
    let params_field_name = &params_field.ident;

    let expanded = quote! {
        impl #name {
            pub fn param(&self, key: &str) -> Option<&toml::Value> {
                self.#params_field_name.as_ref()?.get(key)
            }
        }
    };

    TokenStream::from(expanded)
}