quick-impl 0.2.1

Quickly implement usual methods and traits for enums and structs.
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
41
42
43
44
45
46

use proc_macro2::{Ident, Span, TokenStream};
use quote::quote;
use syn::{ItemStruct, LitStr};

use crate::{
    config::Config, ctx::Context, idents::config::CONFIG_DOC, order::OrderTrait,
    tokens::IndexedField,
};

const DEFAULT_DOC: &str = "Dereferences the value.";

pub fn expand_deref(
    input: &ItemStruct,
    indexed_field: &IndexedField<'_>,
    order: &OrderTrait,
) -> syn::Result<TokenStream> {
    let mut config = Config::new(&order.config, None)?;

    let doc = config.get_formatted_lit_str(
        CONFIG_DOC,
        LitStr::new(DEFAULT_DOC, Span::call_site()),
        [
            &input.ident.to_string(),
            &indexed_field.as_token().to_string(),
        ],
    )?;

    config.finish()?;

    let field_type = &indexed_field.ty;
    let field_ident = indexed_field.as_token();
    let trait_ident = Ident::new("Deref", order.ident.span());
    let method_ident = Ident::new("deref", order.ident.span());

    let content = quote! {
        type Target = #field_type;

        #[doc = #doc]
        #[inline]
        fn #method_ident (&self) -> &Self::Target {
            &self.#field_ident
        }
    };

    Ok(input.in_impl(quote! { ::core::ops::#trait_ident for }, &content, None))
}