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use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::{parse2, File};
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 File),
}
// 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: |file| $pass(file),
}
};
}
const PASSES: &[PostProcessingPass] =
&[pass!(merge_extern_blocks), pass!(sort_semantically)];
pub(crate) fn postprocessing(
items: Vec<TokenStream>,
options: &BindgenOptions,
) -> TokenStream {
let items = items.into_iter().collect();
let require_syn = PASSES.iter().any(|pass| (pass.should_run)(options));
if !require_syn {
return 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.
// The `unwrap` here is deliberate because bindgen should generate valid rust items at all
// times.
let mut file = parse2::<File>(items).unwrap();
for pass in PASSES {
if (pass.should_run)(options) {
(pass.run)(&mut file);
}
}
file.into_token_stream()
}
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