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/*!
An implementation detail of structural.
*/

#![recursion_limit = "192"]
// #![deny(unused_variables)]
// #![deny(unused_imports)]
// #![deny(unused_parens)]
// #![deny(unused_assignments)]
// #![deny(unused_mut)]
// #![deny(unreachable_patterns)]
#![deny(unused_doc_comments)]
#![deny(unconditional_recursion)]
#![deny(rust_2018_idioms)]
// The name of this lint is wrong,
// there's nothing redundant about using pattern matching instead of a method call
#![allow(clippy::redundant_pattern_matching)]
// I use `_` patterns to ensure that all fields are matched,
// using `..` would defeat the purpose for destructuring in the first place.
#![allow(clippy::unneeded_field_pattern)]
#![deny(clippy::shadow_unrelated)]
#![deny(clippy::wildcard_imports)]

#[allow(unused_extern_crates)]
extern crate proc_macro;

mod arenas;
mod datastructure;
mod field_access;
mod field_path_aliases_macro;
mod field_paths;
mod fp_impl;
mod ident_or_index;
mod ignored_wrapper;
mod impl_struct;
mod parse_utils;
mod structural_alias_impl_mod;
mod structural_derive;
mod switch_tstring_aliases;
mod tokenizers;
mod tstring_aliases;
mod utils;
mod write_docs;

use proc_macro::TokenStream as TokenStream1;
use proc_macro2::TokenStream as TokenStream2;

/**


This macro is documented in structural::docs::structural_macro

*/

#[proc_macro_derive(Structural, attributes(struc))]
pub fn derive_structural(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, structural_derive::derive).into()
}

#[proc_macro]
#[doc(hidden)]
pub fn structural_alias_impl(input: TokenStream1) -> TokenStream1 {
    use structural_alias_impl_mod::StructuralAliasesHack;

    parse_or_compile_err(input, |sah: StructuralAliasesHack| Ok(sah.tokens)).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _FP_impl_(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, fp_impl::FP_impl).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _FP_literal_(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, fp_impl::FP_literal_impl).into()
}

/*
/// This is for referencing generic parameters within `fp!()`,
uncomment this if you add a cargo feature to enable proc macros in expression position.
#[proc_macro]
#[doc(hidden)]
pub fn new_fp_impl_(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input,fp_impl::new_fp_impl).into()
}
*/

#[proc_macro]
#[doc(hidden)]
pub fn _field_path_aliases_impl(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, field_path_aliases_macro::impl_).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _tstring_aliases_impl(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, tstring_aliases::impl_).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _TStr_impl_(input: TokenStream1) -> TokenStream1 {
    use crate::tokenizers::tstr_tokens;
    use crate::tstring_aliases::TString;

    parse_or_compile_err(input, |s: TString| Ok(tstr_tokens(s.str, s.span))).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _TStr_lit_impl_(input: TokenStream1) -> TokenStream1 {
    use crate::{parse_utils::ParseBufferExt, tokenizers::tstr_tokens};

    use proc_macro2::Span;
    use syn::{
        parse::{Parse, ParseStream},
        LitStr,
    };

    pub(crate) struct TStrLit {
        pub(crate) str: String,
        pub(crate) span: Span,
    }

    impl Parse for TStrLit {
        fn parse(input: ParseStream<'_>) -> Result<Self, syn::Error> {
            let (str, span) = match input.peek_parse(LitStr)? {
                Some(x) => (x.value(), x.span()),
                None => {
                    let index = input.parse::<syn::Index>()?;
                    (index.index.to_string(), index.span)
                }
            };
            Ok(TStrLit { str, span })
        }
    }

    parse_or_compile_err(input, |s: TStrLit| Ok(tstr_tokens(s.str, s.span))).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _TStr_ident_impl_(input: TokenStream1) -> TokenStream1 {
    use crate::tokenizers::tstr_tokens;

    parse_or_compile_err(input, |ident: syn::Ident| {
        let s = crate::utils::remove_raw_prefix(ident.to_string());
        Ok(tstr_tokens(s, ident.span()))
    })
    .into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _impl_struct_impl(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, impl_struct::impl_).into()
}

#[proc_macro]
#[allow(non_snake_case)]
#[doc(hidden)]
pub fn _switch_tstring_aliases(input: TokenStream1) -> TokenStream1 {
    parse_or_compile_err(input, switch_tstring_aliases::impl_).into()
}

////////////////////////////////////////////////////////////////////////////////

fn parse_or_compile_err<P, F>(input: TokenStream1, f: F) -> TokenStream2
where
    P: syn::parse::Parse,
    F: FnOnce(P) -> Result<TokenStream2, syn::Error>,
{
    syn::parse::<P>(input)
        .and_then(f)
        .unwrap_or_else(|e| e.to_compile_error())
}