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|
use std::{
error::Error,
fmt::Display,
io::{self, Read, Write},
process::exit,
};
use chomp::{
chomp::{
check::{InlineCalls, TypeCheck},
context::Context,
visit::Visitable,
},
lower::{rust::RustBackend, Backend, GenerateCode},
nibble::cst::File,
};
#[derive(Debug)]
struct UndecVar;
impl Display for UndecVar {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Undeclared variable somewhere.")
}
}
impl Error for UndecVar {}
fn main() {
let mut input = String::new();
let res = io::stdin()
.read_to_string(&mut input)
.map_err(|e| Box::new(e) as Box<dyn Error>)
.and_then(|_| syn::parse_str(&input).map_err(|e| Box::new(e) as Box<dyn Error>))
.and_then(|nibble: File| nibble.convert().ok_or(Box::new(UndecVar) as Box<dyn Error>))
.and_then(|(funs, goal)| {
funs.into_iter()
.try_rfold(goal, |goal, function| {
goal.fold(&mut InlineCalls::new(function))
})
.map_err(|e| Box::new(e) as Box<dyn Error>)
})
.and_then(|term| {
let mut context = Context::default();
term.fold(&mut TypeCheck {
context: &mut context,
})
.map_err(|e| Box::new(e) as Box<dyn Error>)
})
.map(|typed| {
let mut backend = RustBackend::default();
let id = typed.gen(&mut backend);
backend.emit_code(id)
})
.and_then(|code| {
write!(io::stdout(), "{:#}", code).map_err(|e| Box::new(e) as Box<dyn Error>)
});
if let Err(e) = res {
eprintln!("{}", e);
exit(1)
}
}
|
