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use proc_macro2::TokenStream;
use quote::quote;
use crate::generator::{Context, Generator};
use crate::leaf::{Callback, Leaf};
use crate::util::MaybeVoid;
impl Generator<'_> {
pub fn generate_leaf(&mut self, leaf: &Leaf, mut ctx: Context) -> TokenStream {
let bump = ctx.bump();
let ident = &leaf.ident;
let name = self.name;
let this = self.this;
let ty = &leaf.field;
let constructor = match leaf.field {
MaybeVoid::Some(_) => quote!(#name::#ident),
MaybeVoid::Void => quote!(|()| #name::#ident),
};
match &leaf.callback {
Some(Callback::Label(callback)) => quote! {
#bump
#callback(lex).construct(#constructor, lex);
},
Some(Callback::Inline(inline)) => {
let arg = &inline.arg;
let body = &inline.body;
#[cfg(not(rust_1_82))]
let ret = quote!(impl CallbackResult<'s, #ty, #this>);
#[cfg(rust_1_82)]
let ret = quote!(impl CallbackResult<'s, #ty, #this> + use<'s>);
quote! {
#bump
#[inline]
fn callback<'s>(#arg: &mut Lexer<'s>) -> #ret {
#body
}
callback(lex).construct(#constructor, lex);
}
}
Some(Callback::Skip(_)) => {
quote! {
#bump
lex.trivia();
#name::lex(lex);
}
}
None if matches!(leaf.field, MaybeVoid::Void) => quote! {
#bump
lex.set(Ok(#name::#ident));
},
None => quote! {
#bump
let token = #name::#ident(lex.slice());
lex.set(Ok(token));
},
}
}
}
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