use rustc_hir::attrs::AttributeKind;
use rustc_span::{Span, Symbol, sym};

use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
use crate::context::Stage;

pub(crate) struct AsPtrParser;
impl<S: Stage> NoArgsAttributeParser<S> for AsPtrParser {
    const PATH: &[Symbol] = &[sym::rustc_as_ptr];
    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
    const CREATE: fn(Span) -> AttributeKind = AttributeKind::AsPtr;
}

pub(crate) struct PubTransparentParser;
impl<S: Stage> NoArgsAttributeParser<S> for PubTransparentParser {
    const PATH: &[Symbol] = &[sym::rustc_pub_transparent];
    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
    const CREATE: fn(Span) -> AttributeKind = AttributeKind::PubTransparent;
}

pub(crate) struct PassByValueParser;
impl<S: Stage> NoArgsAttributeParser<S> for PassByValueParser {
    const PATH: &[Symbol] = &[sym::rustc_pass_by_value];
    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
    const CREATE: fn(Span) -> AttributeKind = AttributeKind::PassByValue;
}

pub(crate) struct AutomaticallyDerivedParser;
impl<S: Stage> NoArgsAttributeParser<S> for AutomaticallyDerivedParser {
    const PATH: &[Symbol] = &[sym::automatically_derived];
    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
    const CREATE: fn(Span) -> AttributeKind = AttributeKind::AutomaticallyDerived;
}