treaty -


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use crate::{
    lookup_hint, lookup_visit,
    protocol::{AnyHint, AnyVisit, Protocol, ProtocolId},
    protocols::{self, str::Str},
    BasicError, Buildable, Error, Hint, HintGiven, Hints, Walkable, WalkableRef,
};

const _: () = {
    pub struct Walker<'value>(&'value str);

    impl<'value> crate::Walker<'value> for Walker<'value> {
        type Error = BasicError;

        fn hints(&mut self) -> &mut dyn Hints<'value, Self::Error> {
            self
        }
    }

    impl<'value, Err: Error<'value>> Hints<'value, Err> for Walker<'value> {
        fn protocol(&mut self, id: ProtocolId) -> Option<AnyHint<'_, 'value, Err>> {
            match id {
                id if id == ProtocolId::of::<Str>() => Some(AnyHint::new(self)),
                _ => None,
            }
        }
    }

    impl<'value, Err: Error<'value>> Hint<'value, Str, Err> for Walker<'value> {
        fn hint(
            &mut self,
            visitor: &mut dyn crate::Visitor<'value, Err>,
            _hint: <Str as crate::protocol::Protocol>::Hint,
        ) -> Result<HintGiven, Err> {
            lookup_visit::<Str, _, _>(visitor)?
                .ok_or_else(Err::missing_visit::<Str>)?
                .visit(protocols::str::Data::Value(self.0))?;

            Ok(HintGiven)
        }

        fn known(
            &mut self,
            _hint: &<Str as crate::protocol::Protocol>::Hint,
        ) -> Result<<Str as crate::protocol::Protocol>::Known, Err> {
            Ok(protocols::str::Known {
                len: Some(self.0.len()),
                kind: Some(protocols::str::Kind::Value),
            })
        }
    }

    impl<'walking, 'value: 'walking> Walkable<'walking, 'value> for &'value str {
        type Walker = Walker<'value>;

        fn walker(&'walking mut self) -> Self::Walker {
            Walker(self)
        }
    }

    impl<'walking, 'value: 'walking> WalkableRef<'walking, 'value> for &'value str {
        fn walker_ref(&'walking self) -> Self::Walker {
            Walker(self)
        }
    }

    pub struct Visitor<'value>(Option<&'value str>);

    impl<'value, Err: Error<'value>> crate::Visitor<'value, Err> for Visitor<'value> {
        fn request_hint(
            &mut self,
            hints: &mut dyn Hints<'value, Err>,
        ) -> Result<Option<HintGiven>, Err> {
            if let Some(hint) = lookup_hint::<Str, _, _>(hints)? {
                Ok(Some(hint.hint(
                    self,
                    protocols::str::Hint {
                        kind: Some(protocols::str::Kind::Value),
                        min_len: None,
                        max_len: None,
                    },
                )?))
            } else {
                Ok(None)
            }
        }

        fn protocol(&mut self, id: ProtocolId) -> Option<AnyVisit<'_, 'value, Err>> {
            match id {
                id if id == ProtocolId::of::<Str>() => Some(AnyVisit::new(self)),
                _ => None,
            }
        }
    }

    impl<'value, Err: Error<'value>> crate::Visit<'value, Str, Err> for Visitor<'value> {
        fn visit<'walking>(
            &'walking mut self,
            accessor: <Str as Protocol<'value>>::Accessor<'walking, Err>,
        ) -> Result<(), Err> {
            match accessor {
                protocols::str::Data::Value(str) | protocols::str::Data::Static(str) => {
                    self.0 = Some(str)
                }
                protocols::str::Data::Walking(_) => {
                    return Err(Err::custom("str value does not live long enough"))
                }
            }
            Ok(())
        }
    }

    impl<'value, Err: Error<'value>> crate::Builder<'value, Err> for Visitor<'value> {
        type Value = &'value str;

        fn init() -> Self
        where
            Self: Sized,
        {
            Visitor(None)
        }

        fn as_visitor(&mut self) -> &mut dyn crate::Visitor<'value, Err> {
            self
        }

        fn finish(self) -> Result<Self::Value, Err>
        where
            Self: Sized,
        {
            if let Some(str) = self.0 {
                Ok(str)
            } else {
                Err(Err::custom_static_str("missing str"))
            }
        }
    }

    impl<'value, Err: Error<'value>> Buildable<'value, Err> for &'value str {
        type Builder = Visitor<'value>;
    }
};