freenet_macros/
lib.rs

1use quote::{quote, quote_spanned};
2use syn::punctuated::Punctuated;
3use syn::spanned::Spanned;
4use syn::{ItemImpl, Meta, Token};
5
6pub(crate) mod common;
7mod contract_impl;
8mod delegate_impl;
9
10struct AttributeArgs {
11    args: Punctuated<Meta, Token![,]>,
12}
13
14impl syn::parse::Parse for AttributeArgs {
15    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
16        let mut args = Punctuated::new();
17        let mut punctuated;
18        let mut count = 0;
19        while !input.is_empty() {
20            punctuated = input.parse::<Token![,]>().ok().is_some();
21            if count > 0 && !punctuated {
22                return Err(syn::Error::new(
23                    input.span(),
24                    "arguments must be comma separated",
25                ));
26            }
27            let meta = input.parse::<Meta>()?;
28            args.push(meta);
29            count += 1;
30        }
31        Ok(AttributeArgs { args })
32    }
33}
34
35enum ContractType {
36    Raw,
37    Typed,
38    Composable,
39}
40
41/// Generate the necessary code for the WASM runtime to interact with your contract ergonomically and safely.
42#[proc_macro_attribute]
43pub fn contract(
44    args: proc_macro::TokenStream,
45    input: proc_macro::TokenStream,
46) -> proc_macro::TokenStream {
47    let args = syn::parse_macro_input!(args as AttributeArgs);
48    let input = syn::parse_macro_input!(input as ItemImpl);
49    let Some((_, path, _)) = &input.trait_ else {
50        return proc_macro::TokenStream::from(quote_spanned! {
51            input.span() =>
52            compile_error!("only allowed for traits");
53        });
54    };
55    match path.segments.last() {
56        Some(segment) => {
57            let c_type = match segment.ident.to_string().as_str() {
58                "ContractInterface" => ContractType::Raw,
59                "TypedContract" => ContractType::Typed,
60                "ContractComponent" => ContractType::Composable,
61                _ => {
62                    return proc_macro::TokenStream::from(quote_spanned! {
63                        segment.ident.span() =>
64                        compile_error!("trait not supported for contract interaction");
65                    })
66                }
67            };
68            contract_impl::contract_ffi_impl(&input, &args, c_type)
69        }
70        None => proc_macro::TokenStream::from(quote_spanned! {
71            path.span() =>
72            compile_error!("missing trait identifier");
73        }),
74    }
75}
76
77/// Generate the necessary code for the WASM runtime to interact with your contract ergonomically and safely.
78#[proc_macro_attribute]
79pub fn delegate(
80    args: proc_macro::TokenStream,
81    input: proc_macro::TokenStream,
82) -> proc_macro::TokenStream {
83    let _args = syn::parse_macro_input!(args as AttributeArgs);
84    let input = syn::parse_macro_input!(input as ItemImpl);
85    let output = delegate_impl::ffi_impl_wrap(&input);
86    // println!("{}", quote!(#input));
87    // println!("{output}");
88    proc_macro::TokenStream::from(quote! {
89        #input
90        #output
91    })
92}
freenet_macros/lib.rs

freenet_macros/
lib.rs
