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use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::Item;
use crate::BindgenOptions;
mod merge_extern_blocks;
mod sort_semantically;
use merge_extern_blocks::merge_extern_blocks;
use sort_semantically::sort_semantically;
struct PostProcessingPass {
should_run: fn(&BindgenOptions) -> bool,
run: fn(&mut Vec<Item>),
}
// TODO: This can be a const fn when mutable references are allowed in const
// context.
macro_rules! pass {
($pass:ident) => {
PostProcessingPass {
should_run: |options| options.$pass,
run: |items| $pass(items),
}
};
}
const PASSES: &[PostProcessingPass] =
&[pass!(merge_extern_blocks), pass!(sort_semantically)];
pub(crate) fn postprocessing(
items: Vec<TokenStream>,
options: &BindgenOptions,
) -> TokenStream {
let require_syn = PASSES.iter().any(|pass| (pass.should_run)(options));
if !require_syn {
return items.into_iter().collect();
}
let module_wrapped_tokens =
quote!(mod wrapper_for_sorting_hack { #( #items )* });
// This syn business is a hack, for now. This means that we are re-parsing already
// generated code using `syn` (as opposed to `quote`) because `syn` provides us more
// control over the elements.
// One caveat is that some of the items coming from `quote`d output might have
// multiple items within them. Hence, we have to wrap the incoming in a `mod`.
// The two `unwrap`s here are deliberate because
// The first one won't panic because we build the `mod` and know it is there
// The second one won't panic because we know original output has something in
// it already.
let (_, mut items) = syn::parse2::<syn::ItemMod>(module_wrapped_tokens)
.unwrap()
.content
.unwrap();
for pass in PASSES {
if (pass.should_run)(options) {
(pass.run)(&mut items);
}
}
let synful_items = items.into_iter().map(|item| item.into_token_stream());
quote! { #( #synful_items )* }
}
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