From 8976c166cff4c98c43cdc409275f548eb27ecb13 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Mon, 18 Jul 2022 20:48:41 +0200
Subject: refactor: reduce the capabilities of the castable_to macro

---
 syrette_macros/src/lib.rs                          | 16 +----
 syrette_macros/src/libs/intertrait_macros/args.rs  | 77 ++--------------------
 .../src/libs/intertrait_macros/gen_caster.rs       | 34 +++-------
 3 files changed, 20 insertions(+), 107 deletions(-)

diff --git a/syrette_macros/src/lib.rs b/syrette_macros/src/lib.rs
index 3145b5f..0a6f0e7 100644
--- a/syrette_macros/src/lib.rs
+++ b/syrette_macros/src/lib.rs
@@ -10,10 +10,7 @@ mod libs;
 use factory_type_alias::FactoryTypeAlias;
 use injectable_impl::InjectableImpl;
 use injectable_macro_args::InjectableMacroArgs;
-use libs::intertrait_macros::{
-    args::{Casts, Flag, Targets},
-    gen_caster::generate_caster,
-};
+use libs::intertrait_macros::{args::Cast, gen_caster::generate_caster};
 
 /// Makes a struct injectable. Thereby usable with `DIContainer`.
 ///
@@ -149,14 +146,7 @@ pub fn factory(_: TokenStream, type_alias_stream: TokenStream) -> TokenStream
 #[proc_macro]
 pub fn castable_to(input: TokenStream) -> TokenStream
 {
-    let Casts {
-        ty,
-        targets: Targets { flags, paths },
-    } = parse_macro_input!(input);
+    let Cast { ty, target } = parse_macro_input!(input);
 
-    paths
-        .iter()
-        .map(|t| generate_caster(&ty, t, flags.contains(&Flag::Sync)))
-        .collect::<proc_macro2::TokenStream>()
-        .into()
+    generate_caster(&ty, &target).into()
 }
diff --git a/syrette_macros/src/libs/intertrait_macros/args.rs b/syrette_macros/src/libs/intertrait_macros/args.rs
index d576ae2..a49567f 100644
--- a/syrette_macros/src/libs/intertrait_macros/args.rs
+++ b/syrette_macros/src/libs/intertrait_macros/args.rs
@@ -11,89 +11,26 @@
 
  * at your option.
 */
-use std::collections::HashSet;
-
-use syn::bracketed;
 use syn::parse::{Parse, ParseStream, Result};
-use syn::punctuated::Punctuated;
-use syn::{Error, Ident, Path, Token, Type};
-
-#[derive(Hash, PartialEq, Eq)]
-pub enum Flag
-{
-    Sync,
-}
-
-impl Flag
-{
-    fn from(ident: &Ident) -> Result<Self>
-    {
-        match ident.to_string().as_str() {
-            "sync" => Ok(Flag::Sync),
-            unknown => {
-                let msg = format!("Unknown flag: {}", unknown);
-                Err(Error::new_spanned(ident, msg))
-            }
-        }
-    }
-}
-
-pub struct Targets
-{
-    pub flags: HashSet<Flag>,
-    pub paths: Vec<Path>,
-}
+use syn::{Path, Token, Type};
 
-impl Parse for Targets
-{
-    fn parse(input: ParseStream) -> Result<Self>
-    {
-        let mut flags = HashSet::new();
-        let mut paths = Vec::new();
-
-        if input.is_empty() {
-            return Ok(Targets { flags, paths });
-        }
-
-        if input.peek(syn::token::Bracket) {
-            let content;
-            bracketed!(content in input);
-            for ident in Punctuated::<Ident, Token![,]>::parse_terminated(&content)? {
-                if !flags.insert(Flag::from(&ident)?) {
-                    let msg = format!("Duplicated flag: {}", ident);
-                    return Err(Error::new_spanned(ident, msg));
-                }
-            }
-        }
-
-        if input.is_empty() {
-            return Ok(Targets { flags, paths });
-        }
-
-        paths = Punctuated::<Path, Token![,]>::parse_terminated(input)?
-            .into_iter()
-            .collect();
-
-        Ok(Targets { flags, paths })
-    }
-}
-
-pub struct Casts
+pub struct Cast
 {
     pub ty: Type,
-    pub targets: Targets,
+    pub target: Path,
 }
 
-impl Parse for Casts
+impl Parse for Cast
 {
     fn parse(input: ParseStream) -> Result<Self>
     {
         let ty: Type = input.parse()?;
+
         input.parse::<Token![=>]>()?;
 
-        Ok(Casts {
+        Ok(Cast {
             ty,
-            targets: input.parse()?,
+            target: input.parse()?,
         })
     }
 }
diff --git a/syrette_macros/src/libs/intertrait_macros/gen_caster.rs b/syrette_macros/src/libs/intertrait_macros/gen_caster.rs
index 268fb09..a0e63b5 100644
--- a/syrette_macros/src/libs/intertrait_macros/gen_caster.rs
+++ b/syrette_macros/src/libs/intertrait_macros/gen_caster.rs
@@ -20,33 +20,19 @@ use quote::ToTokens;
 use uuid::adapter::Simple;
 use uuid::Uuid;
 
-pub fn generate_caster(
-    ty: &impl ToTokens,
-    trait_: &impl ToTokens,
-    sync: bool,
-) -> TokenStream
+pub fn generate_caster(ty: &impl ToTokens, trait_: &impl ToTokens) -> TokenStream
 {
     let mut fn_buf = [0u8; FN_BUF_LEN];
+
     let fn_ident = format_ident!("{}", new_fn_name(&mut fn_buf));
-    let new_caster = if sync {
-        quote! {
-            syrette::libs::intertrait::Caster::<dyn #trait_>::new_sync(
-                |from| from.downcast_ref::<#ty>().unwrap(),
-                |from| from.downcast_mut::<#ty>().unwrap(),
-                |from| from.downcast::<#ty>().unwrap(),
-                |from| from.downcast::<#ty>().unwrap(),
-                |from| from.downcast::<#ty>().unwrap()
-            )
-        }
-    } else {
-        quote! {
-            syrette::libs::intertrait::Caster::<dyn #trait_>::new(
-                |from| from.downcast_ref::<#ty>().unwrap(),
-                |from| from.downcast_mut::<#ty>().unwrap(),
-                |from| from.downcast::<#ty>().unwrap(),
-                |from| from.downcast::<#ty>().unwrap(),
-            )
-        }
+
+    let new_caster = quote! {
+        syrette::libs::intertrait::Caster::<dyn #trait_>::new(
+            |from| from.downcast_ref::<#ty>().unwrap(),
+            |from| from.downcast_mut::<#ty>().unwrap(),
+            |from| from.downcast::<#ty>().unwrap(),
+            |from| from.downcast::<#ty>().unwrap(),
+        )
     };
 
     quote! {
-- 
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