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use proc_macro::TokenStream;
#[path = "../../../../guests_macro/src/parse_fn.rs"]
mod parse_fn;
use crate::parse_fn::FunctionDefinition;
/// Create a body, which reads all inputs, stores them in variables, then
/// commits the ones, defined as public in `default_public_input.toml` to the
/// journal and finally executes the guest entrypoint function with those
/// arguments, committing its output.
///
/// # Usage
///
/// Inside RISC0's guest (excluding the `entrypoint_expr` call):
///
/// ```rust
/// make_wrapper!{fn main(...) -> ...}
/// ```
///
/// # Example output
///
/// ```rust
/// {
/// let ... : ... = read();
/// let ... : ... = read();
/// ...
/// commit(&...);
/// commit(&...);
/// ...
/// commit(&zkp::main(..., ..., ...));
/// }
/// ```
#[proc_macro]
pub fn make_wrapper(item: TokenStream) -> TokenStream {
let fd = FunctionDefinition::new(&item);
let args = fd
.arguments()
.into_iter()
.map(|x| format!("let {x} = read();"))
.collect::<String>();
let mut out = TokenStream::new();
out.extend(args.parse::<TokenStream>());
let commits = fd
.public_patterns()
.clone()
.into_iter()
.map(|x| format!("commit(&{x});"))
.collect::<String>();
out.extend(commits.parse::<TokenStream>());
out.extend(
format!("commit(&zkp::{}({}));", fd.name, fd.grouped_patterns()).parse::<TokenStream>(),
);
let mut block = TokenStream::new();
block.extend(format!("{{ {} }}", out).parse::<TokenStream>());
block
}
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