vermouth 0.5.2

a new kind of parser for procedural macros
Documentation 
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//! Macro type-specialization implementations.

use std::marker::PhantomData;

use crate::{
    IntoTokens, TokenQueue,
    ඞ_macro_exports::{SourceLocation, Verbatim},
};

use super::{
    ReparseKind,
    lit::{LazyLiteral, LitContents},
};

pub struct Spec<T>(PhantomData<T>);

impl<T> Spec<T> {
    #[inline(always)]
    pub fn empty() -> Spec<T> {
        Spec(PhantomData)
    }
    #[inline(always)]
    pub fn new(_: *const T) -> Spec<T> {
        Spec::empty()
    }
}

/// Autoref specializer for literal types.
pub trait SpecLiteralQuote: Sized {
    type Datum;
    fn ඞ_lit_quote<const REGIME: u8>(
        self,
        datum: &Self::Datum,
        text: &'static str,
        location: SourceLocation,
        q: &mut TokenQueue,
    );
}

impl<T: LitContents> SpecLiteralQuote for Spec<T> {
    type Datum = T;

    #[inline(always)]
    fn ඞ_lit_quote<const REGIME: u8>(
        self,
        &datum: &T,
        text: &'static str,
        location: SourceLocation,
        q: &mut TokenQueue,
    ) {
        match LazyLiteral::<T, REGIME>::new(datum) {
            Some(l) => l.extend_tokens(q),
            None => q.push(Verbatim {
                kind: ReparseKind::Literal,
                text,
                location,
            }),
        }
    }
}

/// Not even a recognised literal *type*, just go to fallback.
impl<T> SpecLiteralQuote for &Spec<T> {
    type Datum = T;

    #[inline(always)]
    fn ඞ_lit_quote<const REGIME: u8>(
        self,
        _: &T,
        text: &'static str,
        location: SourceLocation,
        q: &mut TokenQueue,
    ) {
        q.push(Verbatim {
            kind: ReparseKind::Literal,
            text,
            location,
        })
    }
}