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use chomp::{
chomp::{
ast::substitute::Reduce,
typed::{
context::Context,
lower::{Backend, GenerateCode},
TypeInfer,
},
visit::Visitable,
},
lower::RustBackend,
nibble::{convert::{self, Convert}, Statement},
};
use proc_macro::{Span, TokenStream};
use syn::Error;
#[proc_macro]
pub fn nibble(item: TokenStream) -> TokenStream {
syn::parse(item)
.and_then(|nibble: Statement| {
nibble
.convert(&mut convert::Context::default())
.map_err(Error::from)
})
.and_then(|expr| {
expr.fold(&mut Reduce)
.map_err(Error::from)
})
.and_then(|expr| {
let mut context = Context::default();
expr.fold(&mut TypeInfer {
context: &mut context,
})
.map_err(Error::from)
})
.map(|typed| {
let mut backend = RustBackend::default();
let id = typed.gen(&mut backend);
backend.emit_code(None, Span::call_site().into(), id)
})
.unwrap_or_else(Error::into_compile_error)
.into()
}
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