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use proc_macro::TokenStream;
#[path = "../../../../guests_macro/src/parse_fn.rs"]
mod parse_fn;
use crate::parse_fn::{ split_fn, args_split, args_divide_public, args_divide_grouped };
/// Creates a body, which reads all inputs, stores them in variables, then
/// writes the ones, defined as public in `default_public_input.toml` to the
/// journal and finally executes the guest entrypoint function with those
/// arguments.
///
/// # Usage
///
/// Inside Nexus' guest (excluding the `entrypoint_expr` call):
///
/// ```rust
/// make_wrapper!{fn main(...) -> ...}
/// ```
///
/// # Example output
///
/// ```rust
/// {
/// let ... = read_private_input::<...>().unwrap();
/// let ... = read_private_input::<...>().unwrap();
/// ...
/// write_output::<...>(&...);
/// write_output::<...>(&...);
/// ...
/// write_output::<...>(&zkp::main(..., ..., ...));
/// }
/// ```
#[proc_macro]
pub fn make_wrapper(item: TokenStream) -> TokenStream {
let (name, args, ret) = split_fn(&item);
let (ts_patterns, ts_types) = args_divide_grouped(&args);
let mut out = TokenStream::new();
out.extend(format!("let {} = read_private_input::<{}>().unwrap();", ts_patterns, ts_types).parse::<TokenStream>());
let public_inputs = toml::from_str::<toml::Table>(
include_str!(concat!(env!("INPUTS_DIR"), "/default_public_input.toml"))
)
.unwrap();
let (public_patterns, public_types) = args_divide_public(&args, &public_inputs.keys().collect()).0;
let public_patterns: Vec<(TokenStream, TokenStream)> = public_patterns
.into_iter()
.zip(public_types.into_iter())
.collect();
for (pattern, ptype) in public_patterns {
out.extend(format!("write_output::<{}>(&{});", ptype, pattern).parse::<TokenStream>());
}
out.extend(format!("write_output::<{}>(&zkp::{}{});", ret, name, ts_patterns).parse::<TokenStream>());
let mut block = TokenStream::new();
block.extend(format!("{{ {} }}", out).parse::<TokenStream>());
block
}
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