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//! [<img alt="github" src="https://img.shields.io/badge/github-udoprog/borrowme-8da0cb?style=for-the-badge&logo=github" height="20">](https://github.com/udoprog/borrowme)
//! [<img alt="crates.io" src="https://img.shields.io/crates/v/borrowme-macros.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/borrowme-macros)
//! [<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-borrowme--macros-66c2a5?style=for-the-badge&logoColor=white&logo=data:image/svg+xml;base64,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" height="20">](https://docs.rs/borrowme-macros)

mod attr;
mod ctxt;
mod implement;
mod respan;

use ctxt::Ctxt;
use proc_macro2::Span;
use syn::spanned::Spanned;

#[proc_macro_attribute]
pub fn borrowme(
    attr: proc_macro::TokenStream,
    item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    let item = syn::parse_macro_input!(item as syn::Item);

    let attr_list;

    let attr = if !attr.is_empty() {
        // Synthesize a fake attribute so we can used attribute arguments which
        // were passed in when parsing arguments.
        attr_list = [syn::Attribute {
            pound_token: <syn::Token![#]>::default(),
            style: syn::AttrStyle::Outer,
            bracket_token: <syn::token::Bracket>::default(),
            meta: syn::Meta::List(syn::MetaList {
                path: syn::Path::from(syn::Ident::new(attr::BORROWME, Span::call_site())),
                delimiter: syn::MacroDelimiter::Paren(syn::token::Paren::default()),
                tokens: attr.into(),
            }),
        }];

        &attr_list[..]
    } else {
        &[]
    };

    let cx = Ctxt::new(item.span());

    if let Ok(stream) = implement::implement(&cx, attr, item) {
        if !cx.has_errors() {
            return stream.into();
        }
    }

    cx.into_errors().into()
}