remove cast

src/rstd.rs

@@ -4,7 +4,6 @@
 
 pub mod atomic;
 pub mod atomic_object;
-pub mod cast;
 pub mod collections;
 pub mod inject;
 pub mod inlining;

src/rstd/cast.rs

@@ -1,224 +0,0 @@
-//! Utilities to convert from typeless instances defined in [`rcore`].
-//! See [`TypelessMentionable::cast`]/[`Point::cast`].
-//!
-//! p.s. the implementation is horrific.
-//!
-//! [`rcore`]: crate::rcore
-
-use std::convert::identity;
-
-use crate::func::context::*;
-use crate::rcore::*;
-
-use super::{typeless::*, wrapped_origin::*, *};
-
-struct CastResolver<'a, Ctx: Context<'a>> {
-    points: Vec<Point<'a, Ctx, TypelessMentionable<'a, Ctx>>>,
-}
-
-/// Used to represent errors that might arise during resolution/parsion.
-/// Is expected to be classified as [`Context::LookupError`] rather than [`FactoryBase::ParseError`].
-/// [`CastError::AddressIndexOutOfBounds`] and [`CastError::AddressPointMismatch`]
-/// variants generally shouldn't happen.
-#[derive(Debug)]
-pub enum CastError<'a> {
-    Typeless(TypelessError<'a>),
-    /// If you don't know what that means, it's a good idea to [`panic!`].
-    /// Happens due to internal resolver using indices rather than `point`s.
-    /// This error usually indicates inconsistent behaviour
-    /// of [`MentionableTop::points_typed`] and/or [`MentionableTop::topology`].
-    AddressIndexOutOfBounds {
-        index: usize,
-        length: usize,
-    },
-    /// See [`CastError::AddressIndexOutOfBounds`].
-    AddressPointMismatch {
-        expected: Hash,
-        received: Hash,
-        index: usize,
-    },
-}
-
-pub trait CastCtx<'a>: Context<'a> {
-    fn from_cast(cast_error: CastError<'a>) -> Self::LookupError;
-}
-
-impl<'a, Ctx: Context<'a>> CastCtx<'a> for Ctx
-where
-    Self::LookupError: From<CastError<'a>>,
-{
-    fn from_cast(cast_error: CastError<'a>) -> Self::LookupError {
-        cast_error.into()
-    }
-}
-
-impl<'a> Display for CastError<'a> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            Self::Typeless(typeless_error) => {
-                write!(f, "typeless cast error: {}", typeless_error)
-            }
-            Self::AddressIndexOutOfBounds { index, length } => {
-                write!(f, "cast index out of bound: {}>={}", index, length)
-            }
-            Self::AddressPointMismatch {
-                expected,
-                received,
-                index,
-            } => write!(
-                f,
-                "address mismatch at index {}: {}!={}",
-                index,
-                hex(expected),
-                hex(received),
-            ),
-        }
-    }
-}
-
-impl<'a> CastError<'a> {
-    fn pure<Ctx: CastCtx<'a>>(self) -> HashResolution<'a, Ctx> {
-        Ctx::pure(Err(Ctx::from_cast(self)))
-    }
-}
-
-impl<'a, Ctx: CastCtx<'a>> CastResolver<'a, Ctx> {
-    fn rc(points: Vec<Point<'a, Ctx, TypelessMentionable<'a, Ctx>>>) -> Arc<dyn Resolver<'a, Ctx>> {
-        Arc::new(Self { points })
-    }
-
-    fn get_point_impl(
-        &self,
-        index: usize,
-    ) -> Result<&Point<'a, Ctx, TypelessMentionable<'a, Ctx>>, CastError<'a>> {
-        match self.points.get(index) {
-            Some(point) => Ok(point),
-            None => Err(CastError::AddressIndexOutOfBounds {
-                index,
-                length: self.points.len(),
-            }),
-        }
-    }
-
-    fn validate_point(
-        &self,
-        point: &Point<'a, Ctx, TypelessMentionable<'a, Ctx>>,
-        address: Address,
-    ) -> Result<(), CastError<'a>> {
-        if point.point == address.point {
-            Ok(())
-        } else {
-            Err(CastError::AddressPointMismatch {
-                expected: point.point,
-                received: address.point,
-                index: address.index,
-            })
-        }
-    }
-
-    fn get_point(
-        &self,
-        address: Address,
-    ) -> Result<&Point<'a, Ctx, TypelessMentionable<'a, Ctx>>, CastError<'a>> {
-        let point = self.get_point_impl(address.index)?;
-        self.validate_point(point, address)?;
-        Ok(point)
-    }
-}
-
-fn map_resolved<'a, Ctx: CastCtx<'a>>(
-    resolved: ResolutionResult<'a, Ctx, TypelessMentionable<'a, Ctx>>,
-) -> HashResolutionResult<'a, Ctx> {
-    resolved.map_err(lookup_error::<Ctx>).map(|mentionable| {
-        (
-            mentionable.bytes(),
-            CastResolver::rc(mentionable.points_vec()),
-        )
-    })
-}
-
-impl<'a, Ctx: CastCtx<'a>> Resolver<'a, Ctx> for CastResolver<'a, Ctx> {
-    fn resolve(self: Arc<Self>, address: Address) -> HashResolution<'a, Ctx> {
-        let point = match self.get_point(address) {
-            Ok(point) => point,
-            Err(cast_error) => return cast_error.pure::<Ctx>(),
-        };
-        point.resolve_map(map_resolved)
-    }
-}
-
-impl<'a, Ctx: CastCtx<'a>> TypelessMentionable<'a, Ctx> {
-    pub fn cast_full<A: Mentionable<'a, Ctx>>(
-        &self,
-        factory: A::Fctr,
-        map_resolver: impl FnOnce(Arc<dyn Resolver<'a, Ctx>>) -> Arc<dyn Resolver<'a, Ctx>>,
-    ) -> ParseResultA<'a, A> {
-        factory.parse_slice(
-            &self.bytes(),
-            &map_resolver(CastResolver::rc(self.points_vec())),
-        )
-    }
-
-    /// Re-parse the object as if it is of a specific type. Has potential to break topology.
-    pub fn cast<A: Mentionable<'a, Ctx>>(&self, factory: A::Fctr) -> ParseResultA<'a, A> {
-        self.cast_full(factory, identity)
-    }
-}
-
-fn lookup_error<'a, Ctx: CastCtx<'a>>(
-    error: ResolutionFailure<'a, Ctx, TypelessMentionable<'a, Ctx>>,
-) -> Ctx::LookupError {
-    match error {
-        ResolutionError::Lookup(lookup_error) => lookup_error,
-        ResolutionError::Parse(parse_error) => Ctx::from_cast(CastError::Typeless(parse_error)),
-    }
-}
-
-fn cast_resolved<'a, Ctx: CastCtx<'a>, A: Mentionable<'a, Ctx>>(
-    resolved: ResolutionResult<'a, Ctx, TypelessMentionable<'a, Ctx>>,
-    factory: A::Fctr,
-) -> ResolutionResult<'a, Ctx, A> {
-    resolved
-        .map_err(lookup_error::<Ctx>)
-        .map_err(ResolutionError::Lookup)?
-        .cast(factory)
-        .map_err(ResolutionError::Parse)
-        .map(Arc::new)
-}
-
-fn cast_resolve<'a, Ctx: CastCtx<'a>, A: Mentionable<'a, Ctx>>(
-    typeless_origin: Arc<dyn Origin<'a, Ctx, Mtbl = TypelessMentionable<'a, Ctx>>>,
-    factory: A::Fctr,
-) -> Resolution<'a, Ctx, A> {
-    typeless_origin.resolve_map(|resolved| cast_resolved(resolved, factory))
-}
-
-fn cast_origin<'a, Ctx: CastCtx<'a>, A: Mentionable<'a, Ctx>>(
-    typeless_origin: Arc<dyn Origin<'a, Ctx, Mtbl = TypelessMentionable<'a, Ctx>>>,
-    factory: A::Fctr,
-) -> Arc<dyn Origin<'a, Ctx, Mtbl = A>> {
-    let origin_rb = typeless_origin.clone();
-    wrapped_origin(
-        factory.clone(),
-        move || cast_resolve(typeless_origin.clone(), factory.clone()),
-        move || origin_rb.ref_resolve_bytes(),
-    )
-}
-
-impl<'a, Ctx: CastCtx<'a>> Point<'a, Ctx, TypelessMentionable<'a, Ctx>> {
-    fn cast_origin<A: Mentionable<'a, Ctx>>(
-        &self,
-        factory: A::Fctr,
-    ) -> Arc<dyn Origin<'a, Ctx, Mtbl = A>> {
-        let typeless_origin = self.origin.clone();
-        cast_origin(typeless_origin, factory)
-    }
-
-    /// See [`TypelessMentionable::cast`]
-    pub fn cast<A: Mentionable<'a, Ctx>>(&self, factory: A::Fctr) -> Point<'a, Ctx, A> {
-        Point {
-            point: self.point,
-            origin: self.cast_origin(factory),
-        }
-    }
-}

src/rstd/typeless.rs

@@ -2,7 +2,7 @@
 //!
 //! [`rcore`]: crate::rcore
 
-use super::{cast::*, wrapped_origin::*, *};
+use super::{singular::*, tcast::*, wrapped_origin::*, *};
 use crate::mode::*;
 
 type TypelessSerialize<'a> = dyn 'a + Send + Sync + Fn(&mut dyn Serializer);
@@ -112,7 +112,7 @@ impl<'a, Ctx: Context<'a>> CRegularFactory<'a, Ctx> for TypelessFactory<'a, Ctx>
     }
 }
 
-impl<'a, Ctx: CastCtx<'a>> TypelessMentionable<'a, Ctx> {
+impl<'a, Ctx: SingularCtx<'a>> TypelessMentionable<'a, Ctx> {
     pub fn from_typed<A: Mentionable<'a, Ctx>>(mentionable: Arc<A>) -> Self {
         let factory = TypelessFactory::from_typed(mentionable.factory());
         let topology = mentionable.topology();
@@ -126,7 +126,7 @@ impl<'a, Ctx: CastCtx<'a>> TypelessMentionable<'a, Ctx> {
     }
 }
 
-impl<'a, Ctx: CastCtx<'a>, F: Factory<'a, Ctx>> Tde<'a, Ctx> for F {
+impl<'a, Ctx: SingularCtx<'a>, F: Factory<'a, Ctx>> Tde<'a, Ctx> for F {
     fn clone_box(&self) -> TdeBox<'a, Ctx> {
         Box::new(self.clone())
     }
@@ -142,7 +142,7 @@ impl<'a, Ctx: CastCtx<'a>, F: Factory<'a, Ctx>> Tde<'a, Ctx> for F {
     }
 }
 
-impl<'a, Ctx: CastCtx<'a>, F: Factory<'a, Ctx>> Tut<'a, Ctx> for F {
+impl<'a, Ctx: SingularCtx<'a>, F: Factory<'a, Ctx>> Tut<'a, Ctx> for F {
     fn clone_box(&self) -> TutBox<'a, Ctx> {
         Box::new(self.clone())
     }
@@ -153,7 +153,7 @@ impl<'a, Ctx: CastCtx<'a>, F: Factory<'a, Ctx>> Tut<'a, Ctx> for F {
         tail: &[u8],
     ) -> Result<TypelessMentionable<'a, Ctx>, TypelessError<'a>> {
         self.extend(
-            match mentionable.cast(self.clone()) {
+            match mentionable.m_cast(self) {
                 Ok(m) => m,
                 Err(e) => return Err(TypelessError::from_typed(e)),
             },
@@ -165,7 +165,7 @@ impl<'a, Ctx: CastCtx<'a>, F: Factory<'a, Ctx>> Tut<'a, Ctx> for F {
     }
 }
 
-impl<'a, Ctx: CastCtx<'a>> TypelessFactory<'a, Ctx> {
+impl<'a, Ctx: SingularCtx<'a>> TypelessFactory<'a, Ctx> {
     pub fn from_typed<F: Factory<'a, Ctx>>(factory: F) -> Self {
         TypelessFactory {
             t_deserialize: Box::new(factory.clone()),
@@ -180,7 +180,7 @@ impl<'a> TypelessError<'a> {
     }
 }
 
-impl<'a, Ctx: CastCtx<'a>, A: Mentionable<'a, Ctx>> Point<'a, Ctx, A> {
+impl<'a, Ctx: SingularCtx<'a>, A: Mentionable<'a, Ctx>> Point<'a, Ctx, A> {
     /// Typeless version of the point.
     pub fn typeless(&self) -> Point<'a, Ctx, TypelessMentionable<'a, Ctx>> {
         Point {
@@ -201,7 +201,7 @@ pub trait MentionableExt<'a, Ctx: Context<'a>>: Mentionable<'a, Ctx> {
     fn points_vec(&self) -> Vec<Point<'a, Ctx, TypelessMentionable<'a, Ctx>>>;
 }
 
-impl<'a, Ctx: CastCtx<'a>, A: Mentionable<'a, Ctx>> MentionableExt<'a, Ctx> for A {
+impl<'a, Ctx: SingularCtx<'a>, A: Mentionable<'a, Ctx>> MentionableExt<'a, Ctx> for A {
     fn points_typeless(&self, points: &mut Vec<Point<'a, Ctx, TypelessMentionable<'a, Ctx>>>) {
         self.points_typed(points)
     }
@@ -213,7 +213,7 @@ impl<'a, Ctx: CastCtx<'a>, A: Mentionable<'a, Ctx>> MentionableExt<'a, Ctx> for
     }
 }
 
-impl<'a, Ctx: CastCtx<'a>> PointsVisitor<'a, Ctx>
+impl<'a, Ctx: SingularCtx<'a>> PointsVisitor<'a, Ctx>
     for Vec<Point<'a, Ctx, TypelessMentionable<'a, Ctx>>>
 {
     fn visit<A: Mentionable<'a, Ctx>>(&mut self, point: &Point<'a, Ctx, A>) {

src/rstd/wrapped_origin.rs

@@ -2,18 +2,6 @@ use crate::func::context::*;
 
 use super::*;
 
-pub fn wrapped_origin<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>>(
-    factory: A::Fctr,
-    resolve: impl 'a + Send + Sync + Fn() -> Resolution<'a, Ctx, A>,
-    resolve_bytes: impl 'a + Send + Sync + Fn() -> HashResolution<'a, Ctx>,
-) -> Arc<dyn Origin<'a, Ctx, Mtbl = A>> {
-    Arc::new(WrappedOrigin {
-        w_factory: factory,
-        w_resolve: Box::new(resolve),
-        w_resolve_bytes: Box::new(resolve_bytes),
-    })
-}
-
 pub trait MappableOrigin<'a, Ctx: Context<'a>>: Origin<'a, Ctx> {
     fn map<B: Mentionable<'a, Ctx>>(
         self: Arc<Self>,

src/testing.rs

@@ -7,7 +7,8 @@ use sha2::{Digest, Sha256};
 
 use crate::func::{context::*, *};
 use crate::rcore::*;
-use crate::rstd::{cast::*, inject::*, typeless::*};
+use crate::rstd::singular::*;
+use crate::rstd::{inject::*, typeless::*};
 
 pub struct NoDiagnostic;
 
@@ -30,7 +31,7 @@ pub struct TestContextPlain;
 #[derive(Debug)]
 pub enum TestLookupError<'a> {
     Typeless(TypelessError<'a>),
-    Cast(CastError<'a>),
+    Singular(SingularError),
     EmptyResolverAccess(Address),
 }
 
@@ -40,9 +41,9 @@ impl<'a> From<TypelessError<'a>> for TestLookupError<'a> {
     }
 }
 
-impl<'a> From<CastError<'a>> for TestLookupError<'a> {
-    fn from(value: CastError<'a>) -> Self {
-        Self::Cast(value)
+impl<'a> From<SingularError> for TestLookupError<'a> {
+    fn from(value: SingularError) -> Self {
+        Self::Singular(value)
     }
 }
 
@@ -52,8 +53,8 @@ impl<'a> Display for TestLookupError<'a> {
             Self::Typeless(typeless_error) => {
                 write!(f, "typeless lookup failure: {}", typeless_error)
             }
-            Self::Cast(cast_error) => {
-                write!(f, "cast failure: {}", cast_error)
+            Self::Singular(singular_error) => {
+                write!(f, "singular failure: {}", singular_error)
             }
             Self::EmptyResolverAccess(address) => {
                 write!(f, "accessed an empty resolved at address {}", address)