quick-macros 0.1.2

Crate providing simple useful macros
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_macro2::TokenStream;
use proc_macro_error::abort_call_site;
use quote::quote;
use syn::{Data, DeriveInput, Ident};

pub(crate) fn field_names(input: DeriveInput) -> TokenStream {
    let struct_name = input.ident;

    let fields = if let Data::Struct(data) = input.data {
        data.fields
    } else {
        abort_call_site!("FieldNames can only be used on structs");
    };

    let nameof_getters = fields.iter().filter_map(|field| {
        if let Some(ident) = &field.ident {
            let field_name = ident.to_string();
            let method_name = Ident::new(&format!("nameof_{}", field_name), ident.span());
            Some(quote! {
                pub fn #method_name() -> &'static str {
                    #field_name
                }
            })
        } else {
            None
        }
    });

    let expanded = quote! {
        impl #struct_name {
            #(#nameof_getters)*
        }
    };

    expanded
}