lyra-reflect/Cargo.toml

@@ -5,6 +5,10 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+math = ["dep:glam"]
+
 [dependencies]
 lyra-reflect-derive = { path = "lyra-reflect-derive" }
 lyra-ecs = { path = "../lyra-ecs" }
+glam = { version = "0.24.0", optional = true }

lyra-reflect/lyra-reflect-derive/src/lib.rs

@@ -11,6 +11,52 @@ mod struct_derive;
 #[allow(unused_imports)]
 use struct_derive::*;
 
+mod struct_macro;
+
+/* #[proc_macro_attribute(attributes(reflect))]
+pub fn reflect(_attr: proc_macro::TokenStream, item: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    item
+} */
+
+pub(crate) struct FieldAttributes(Vec<ReflectAttribute>);
+
+impl FieldAttributes {
+    /// Searches for a usage of the 'reflect' attribute and returns a list of the
+    /// things used in the usage.
+    pub fn from_vec(v: &Vec<syn::Attribute>) -> Result<Self, syn::Error> {
+        let s: Result<Vec<ReflectAttribute>, _> = v.iter().filter_map(|att| match &att.meta {
+            syn::Meta::Path(_) => None,
+            syn::Meta::List(l) => {
+                Some(syn::parse::<ReflectAttribute>(l.tokens.clone().into()))
+            }
+            syn::Meta::NameValue(_) => None
+        }).collect();
+
+        Ok(Self(s?))
+    }
+
+    pub fn has_skip(&self) -> bool {
+        self.0.iter().any(|a| *a == ReflectAttribute::Skip)
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum ReflectAttribute {
+    Skip
+}
+
+impl syn::parse::Parse for ReflectAttribute {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let ident: Ident = input.parse()?;
+        let ident_str = ident.to_string().to_lowercase();
+
+        match ident_str.as_str() {
+            "skip" => Ok(Self::Skip),
+            _ => Err(syn::Error::new(ident.span(), "Unknown reflect attribute flag"))
+        }
+    }
+}
+
 #[allow(dead_code)]
 pub(crate) struct ReflectDef {
     //pub ident: Ident,
@@ -36,7 +82,7 @@ impl syn::parse::Parse for ReflectDef {
     }
 }
 
-#[proc_macro_derive(Reflect)]
+#[proc_macro_derive(Reflect, attributes(reflect))]
 pub fn derive_reflect(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse_macro_input!(input as DeriveInput);
 
@@ -128,3 +174,8 @@ pub(crate) fn add_trait_bounds(mut generics: Generics, add_bounds: Vec<TypeParam
     }
     generics
 }
+
+#[proc_macro]
+pub fn impl_reflect_simple_struct(input: TokenStream) -> TokenStream {
+    struct_macro::impl_reflect_simple_struct(input)
+}

lyra-reflect/lyra-reflect-derive/src/struct_derive.rs

@@ -1,7 +1,28 @@
 use quote::{quote, ToTokens};
 use syn::{DeriveInput, parse_quote, DataStruct};
 
-use crate::add_trait_bounds;
+use crate::{add_trait_bounds, FieldAttributes};
+
+#[derive(Debug, PartialEq, Eq)]
+enum StructType {
+    Unit,
+    Named,
+    Tuple,
+}
+
+impl StructType {
+    pub fn new(data: &DataStruct) -> Self {
+        if let Some(first) = data.fields.iter().next() {
+            if first.ident.is_some() {
+                Self::Named
+            } else {
+                Self::Tuple
+            }
+        } else {
+            Self::Unit
+        }
+    }
+}
 
 /// Generates code that matches a string with a struct's field name, and returns an Option that
 /// contains a borrow (mutable borrow if `is_mut` is true) to the matching struct field.
@@ -22,7 +43,12 @@ use crate::add_trait_bounds;
 ///     _ => None,
 /// }
 /// ```
+/// 
+/// If the struct is a unit or tuple struct, None will always be returned
 fn gen_struct_field_match(data: &DataStruct, is_mut: bool) -> proc_macro2::TokenStream {
+    let ty = StructType::new(data);
+
+    if ty == StructType::Named {
         let mut_tkn = if is_mut {
             quote! {
                 mut
@@ -33,9 +59,17 @@ fn gen_struct_field_match(data: &DataStruct, is_mut: bool) -> proc_macro2::Token
             let field_ident = field.ident.as_ref().expect("Struct is missing field ident!");
             let field_name_str = field_ident.to_string();
             
+            let attrs = FieldAttributes::from_vec(&field.attrs)
+                .expect("Failure to parse reflect attributes");
+            if attrs.has_skip() {
+                quote! {
+                    #field_name_str => None
+                }
+            } else {
                 quote! {
                     #field_name_str => Some(&#mut_tkn self.#field_ident)
                 }
+            }
         });
 
         quote! {
@@ -44,6 +78,7 @@ fn gen_struct_field_match(data: &DataStruct, is_mut: bool) -> proc_macro2::Token
                 _ => None,
             }
         }
+    } else { quote!(None) }
 }
 
 /// Generates code that matches a string with a struct's field name, and sets that field value
@@ -64,16 +99,27 @@ fn gen_struct_field_match(data: &DataStruct, is_mut: bool) -> proc_macro2::Token
 /// }
 /// ```
 fn gen_struct_set_field_match(data: &DataStruct) -> proc_macro2::TokenStream {
+    let ty = StructType::new(data);
+
+    if ty == StructType::Named {
         let field_arms = data.fields.iter().map(|field| {
             let field_ident = field.ident.as_ref().expect("Struct is missing field ident!");
             let field_name_str = field_ident.to_string();
             let field_ty = &field.ty;
             
+            let attrs = FieldAttributes::from_vec(&field.attrs)
+                .expect("Failure to parse reflect attributes");
+            if attrs.has_skip() {
+                quote! {
+                    #field_name_str => {}
+                }
+            } else {
                 quote! {
                     #field_name_str => self.#field_ident = any_val.downcast_ref::<#field_ty>()
                         .expect(&format!("Cannot set struct's field of {} type to the provided type of {}", #field_name_str, val.name()))
                         .clone() //Some(&#mut_tkn self.#field_ident)
                 }
+            }
         });
 
         quote! {
@@ -84,7 +130,10 @@ fn gen_struct_set_field_match(data: &DataStruct) -> proc_macro2::TokenStream {
                     return false;
                 },
             }
+
+            true
         }
+    } else { quote!(return false;) }
 }
 
 /// Generates code that matches a string with a struct's field name, and returns a string that is
@@ -99,6 +148,9 @@ fn gen_struct_set_field_match(data: &DataStruct) -> proc_macro2::TokenStream {
 /// }
 /// ```
 fn gen_struct_field_name_match(data: &DataStruct) -> proc_macro2::TokenStream {
+    let ty = StructType::new(data);
+
+    if ty == StructType::Named {
         let field_arms = data.fields.iter().map(|field| {
             let field_ident = field.ident.as_ref().expect("Struct is missing field ident!");
             let field_name_str = field_ident.to_string();
@@ -118,6 +170,7 @@ fn gen_struct_field_name_match(data: &DataStruct) -> proc_macro2::TokenStream {
                 _ => None,
             }
         }
+    } else { quote!(None) }
 }
 
 /// Generates code that matches a string with a struct's field name, and sets that field value
@@ -138,16 +191,39 @@ fn gen_struct_field_name_match(data: &DataStruct) -> proc_macro2::TokenStream {
 /// }
 /// ```
 fn gen_struct_set_field_match_idx(data: &DataStruct) -> proc_macro2::TokenStream {
+    let ty = StructType::new(data);
+
+    if ty == StructType::Unit {
+        return quote!( return false; );
+    }
+
     let field_arms = data.fields.iter().enumerate().map(|(idx, field)| {
-        let field_ident = field.ident.as_ref().expect("Struct is missing field ident!");
-        let field_name_str = field_ident.to_string();
         let field_ty = &field.ty;
 
+        let attrs = FieldAttributes::from_vec(&field.attrs)
+            .expect("Failure to parse reflect attributes");
+        if attrs.has_skip() {
+            return quote! {
+                #idx => {}
+            };
+        }
+
+        if let Some(field_ident) = &field.ident {
+            let field_name_str = field_ident.to_string();
+
             quote! {
                 #idx => self.#field_ident = any_val.downcast_ref::<#field_ty>()
-                .expect(&format!("Cannot set struct's field of {} type to the provided type of {}", #field_name_str, val.name()))
+                    .expect(&format!("Cannot set struct's field of {} to the provided type of {}", #field_name_str, val.name()))
                     .clone()
             }
+        } else {
+            let sidx = syn::Index::from(idx);
+            quote! {
+                #idx => self.#sidx = any_val.downcast_ref::<#field_ty>()
+                    .expect(&format!("Cannot set struct's field at {} to the provided type of {}", #idx, val.name()))
+                    .clone()
+            }
+        }
     });
 
     quote! {
@@ -158,6 +234,8 @@ fn gen_struct_set_field_match_idx(data: &DataStruct) -> proc_macro2::TokenStream
                 return false;
             },
         }
+
+        true
     }
 }
 
@@ -212,6 +290,12 @@ fn gen_struct_field_name_match_idx(data: &DataStruct) -> proc_macro2::TokenStrea
 /// }
 /// ```
 fn gen_struct_field_match_idx(data: &DataStruct, is_mut: bool) -> proc_macro2::TokenStream {
+    let ty = StructType::new(data);
+
+    if ty == StructType::Unit {
+        return quote!(None);
+    }
+
     let mut_tkn = if is_mut {
         quote! {
             mut
@@ -219,11 +303,24 @@ fn gen_struct_field_match_idx(data: &DataStruct, is_mut: bool) -> proc_macro2::T
     } else { quote!{} };
     
     let field_arms = data.fields.iter().enumerate().map(|(idx, field)| {
-        let field_ident = field.ident.as_ref().expect("Struct is missing field ident!");
+        let attrs = FieldAttributes::from_vec(&field.attrs)
+            .expect("Failure to parse reflect attributes");
+        if attrs.has_skip() {
+            return quote! {
+                #idx => None
+            };
+        }
         
+        if let Some(field_ident) = &field.ident {
             quote! {
                 #idx => Some(&#mut_tkn self.#field_ident)
             }
+        } else {
+            let sidx = syn::Index::from(idx);
+            quote! {
+                #idx => Some(&#mut_tkn self.#sidx)
+            }
+        }
     });
 
     quote! {
@@ -246,6 +343,9 @@ fn gen_struct_field_match_idx(data: &DataStruct, is_mut: bool) -> proc_macro2::T
 /// }
 /// ```
 fn gen_struct_field_name_idx(data: &DataStruct) -> proc_macro2::TokenStream {
+    let ty = StructType::new(data);
+
+    if ty == StructType::Named {
         let field_arms = data.fields.iter().enumerate().map(|(idx, field)| {
             let field_ident = field.ident.as_ref().expect("Struct is missing field ident!");
             let field_name_str = field_ident.to_string();
@@ -261,6 +361,9 @@ fn gen_struct_field_name_idx(data: &DataStruct) -> proc_macro2::TokenStream {
                 _ => None,
             }
         }
+    } else {
+        quote!(None)
+    }
 }
 
 /// Generates a token stream that implements Reflect and Struct for the provided struct
@@ -361,12 +464,10 @@ pub fn derive_reflect_struct(input: &DeriveInput, data_struct: &DataStruct) -> p
 
             fn set_field(&mut self, name: &str, val: &dyn lyra_engine::reflect::Reflect) -> bool {
                 #set_field_named
-                true
             }
 
             fn set_field_at(&mut self, idx: usize, val: &dyn lyra_engine::reflect::Reflect) -> bool {
                 #set_field_idx
-                true
             }
 
             fn field_type(&self, name: &str) -> Option<&'static str> {

lyra-reflect/lyra-reflect-derive/src/struct_macro.rs

@@ -0,0 +1,270 @@
+use quote::quote;
+use syn::{Token, parenthesized, punctuated::Punctuated};
+
+struct Field {
+    name: syn::Ident,
+    _eq: Token![=],
+    ty: syn::Ident,
+}
+
+impl syn::parse::Parse for Field {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        Ok(Self {
+            name: input.parse()?,
+            _eq: input.parse()?,
+            ty: input.parse()?,
+        })
+    }
+}
+
+struct SimpleStruct {
+    type_path: syn::Path,
+    pub generics: syn::Generics,
+    fields: Vec<Field>,
+}
+
+impl syn::parse::Parse for SimpleStruct {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        //let type_path = syn::Path::parse_mod_style(input)?;
+        let type_path: syn::Path = input.parse()?;
+        /* let mut generics = input.parse::<syn::Generics>()?;
+        generics.where_clause = input.parse()?; */
+
+        let mut fields = vec![];
+
+        // parse fields if a comma is found
+        if input.peek(Token![,]) {
+            let _: Token![,] = input.parse()?;
+            let ident: syn::Ident = input.parse()?;
+            let ident_str = ident.to_string();
+
+            match ident_str.as_str() {
+                "fields" => {
+                    let content;
+                    let _parens: syn::token::Paren = parenthesized!(content in input);
+
+                    let f: Punctuated<Field, Token![,]> = content.parse_terminated(Field::parse, Token![,])?;
+                    fields = f.into_iter().collect();
+                },
+                _ => return Err(syn::Error::new(ident.span(), "Unknown macro command, expected `fields`")),
+            }
+        }
+
+        Ok(Self {
+            type_path,
+            generics: syn::Generics::default(),
+            fields,
+        })
+
+    }
+}
+
+
+fn gen_match_field_name_arm(simple: &SimpleStruct, default: &proc_macro2::TokenStream, arm_gen: fn(field: &Field) -> proc_macro2::TokenStream) -> proc_macro2::TokenStream {
+    let field_arms_iter = simple.fields.iter().map(|f| {
+        let fname = &f.name;
+        let arm = arm_gen(f);
+
+        quote! {
+            stringify!(#fname) => #arm
+        }
+    });
+
+    quote! {
+        match name {
+            #(#field_arms_iter,)*
+            _ => #default,
+        }
+    }
+}
+
+fn gen_match_field_index_arm(simple: &SimpleStruct, default: &proc_macro2::TokenStream, arm_gen: fn(field: &Field) -> proc_macro2::TokenStream) -> proc_macro2::TokenStream {
+    let field_arms_iter = simple.fields.iter().enumerate().map(|(idx, f)| {
+        let arm = arm_gen(f);
+
+        quote! {
+            #idx => #arm
+        }
+    });
+
+    quote! {
+        match idx {
+            #(#field_arms_iter,)*
+            _ => #default,
+        }
+    }
+}
+
+pub(crate) fn impl_reflect_simple_struct(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let simple = syn::parse_macro_input!(input as SimpleStruct);
+
+    let type_path = &simple.type_path;
+    let (impl_generics, ty_generics, where_clause) = simple.generics.split_for_impl();
+    // convert the type path to a string. This would not create a leading separator
+    /* let type_path_str = {
+        let idents: Vec<String> = type_path.segments.iter()
+            .map(|segment| segment.ident.to_string())
+            .collect();
+        idents.join("::")
+    }; */
+
+    let borrow_fn = |field: &Field| {
+        let name = &field.name;
+        quote! {
+            Some(&self.#name)
+        }
+    };
+
+    let borrow_mut_fn = |field: &Field| {
+        let name = &field.name;
+        quote! {
+            Some(&mut self.#name)
+        }
+    };
+
+    let none_default = quote!(None);
+    let false_return_default = quote!( { return false; });
+    
+    let field_count = simple.fields.len();
+
+    let field_fn = gen_match_field_name_arm(&simple, &none_default, borrow_fn);
+    let field_mut_fn = gen_match_field_name_arm(&simple, &none_default, borrow_mut_fn);
+    let field_at_fn = gen_match_field_index_arm(&simple, &none_default, borrow_fn);
+    let field_at_mut_fn = gen_match_field_index_arm(&simple, &none_default, borrow_mut_fn);
+    let field_name_at_fn = gen_match_field_index_arm(&simple, &none_default, |f| {
+        let name = &f.name;
+        quote! {
+            Some(stringify!(#name))
+        }
+    });
+
+    let set_field_arm = |f: &Field| {
+        let name = &f.name;
+        let ty = &f.ty;
+        quote! {
+            self.#name = any_val.downcast_ref::<#ty>()
+                .expect(&format!("Cannot set struct's field of {} type to the provided type of {}", stringify!(#name), val.name()))
+                .clone() //Some(&#mut_tkn self.#field_ident)
+        }
+    };
+
+    let set_field_fn = gen_match_field_name_arm(&simple, &false_return_default, set_field_arm);
+    let set_field_at_fn = gen_match_field_index_arm(&simple, &false_return_default, set_field_arm);
+
+    let get_field_ty_arm = |f: &Field| {
+        let fty = &f.ty;
+        quote! {
+            Some(stringify!(#fty))
+        }
+    };
+    let field_type_fn = gen_match_field_name_arm(&simple, &none_default, get_field_ty_arm);
+    let field_type_at_fn = gen_match_field_index_arm(&simple, &none_default, get_field_ty_arm);
+
+    proc_macro::TokenStream::from(quote! {
+        impl #impl_generics lyra_engine::reflect::Reflect for #type_path #ty_generics #where_clause {
+            fn name(&self) -> ::std::string::String {
+                stringify!(#type_path).to_string()
+            }
+        
+            fn type_id(&self) -> std::any::TypeId {
+                std::any::TypeId::of::<#type_path #ty_generics>()
+            }
+        
+            fn as_any(&self) -> &dyn std::any::Any {
+                self
+            }
+        
+            fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
+                self
+            }
+        
+            fn apply(&mut self, val: &dyn lyra_engine::reflect::Reflect) {
+                let val = val.as_any().downcast_ref::<Self>()
+                    .expect("The type of `val` is not the same as `self`");
+                *self = val.clone();
+            }
+
+            fn clone_inner(&self) -> Box<dyn lyra_engine::reflect::Reflect> {
+                Box::new(self.clone())
+            }
+
+            fn reflect_ref(&self) -> lyra_engine::reflect::ReflectRef {
+                lyra_engine::reflect::ReflectRef::Value(self)
+            }
+
+            fn reflect_mut(&mut self) -> lyra_engine::reflect::ReflectMut {
+                lyra_engine::reflect::ReflectMut::Value(self)
+            }
+
+            fn reflect_val(&self) -> &dyn lyra_engine::reflect::Reflect {
+                self
+            }
+
+            fn reflect_val_mut(&mut self) -> &mut dyn lyra_engine::reflect::Reflect {
+                self
+            }
+        }
+
+        impl #impl_generics lyra_engine::reflect::Struct for #type_path #ty_generics #where_clause {
+            fn field(&self, name: &str) -> Option<&dyn Reflect> {
+                #field_fn
+            }
+
+            fn field_mut(&mut self, name: &str) -> Option<&mut dyn Reflect> {
+                #field_mut_fn
+            }
+
+            fn fields_len(&self) -> usize {
+                #field_count
+            }
+
+            fn field_at(&self, idx: usize) -> Option<&dyn Reflect> {
+                #field_at_fn
+            }
+
+            fn field_at_mut(&mut self, idx: usize) -> Option<&mut dyn Reflect> {
+                #field_at_mut_fn
+            }
+
+            fn field_name_at(&self, idx: usize) -> Option<&str> {
+                #field_name_at_fn
+            }
+
+            fn set_field(&mut self, name: &str, val: &dyn Reflect) -> bool {
+                let any_val = val.as_any();
+
+                #set_field_fn
+
+                true
+            }
+
+            fn set_field_at(&mut self, idx: usize, val: &dyn Reflect) -> bool {
+                let any_val = val.as_any();
+
+                #set_field_at_fn
+
+                true
+            }
+
+            fn field_type(&self, name: &str) -> Option<&'static str> {
+                #field_type_fn
+            }
+
+            fn field_type_at(&self, idx: usize) -> Option<&'static str> {
+                #field_type_at_fn
+            }
+
+            fn method(&self, name: &str) -> Option<&Method> {
+                unimplemented!()
+            }
+            
+            fn method_at(&self, idx: usize) -> Option<&Method> {
+                unimplemented!()
+            }
+
+            fn methods_len(&self) -> usize {
+                unimplemented!()
+            }
+        }
+    })
+}

lyra-reflect/src/impls/impl_math.rs

@@ -0,0 +1,10 @@
+use lyra_reflect_derive::{impl_reflect_simple_struct, impl_reflect_trait_value};
+
+use crate::{lyra_engine, Reflect, Method};
+
+impl_reflect_simple_struct!(glam::Vec2, fields(x=f32, y=f32));
+impl_reflect_simple_struct!(glam::Vec3, fields(x=f32, y=f32, z=f32));
+impl_reflect_simple_struct!(glam::Vec4, fields(x=f32, y=f32, z=f32, w=f32));
+impl_reflect_simple_struct!(glam::Quat, fields(x=f32, y=f32, z=f32, w=f32));
+
+impl_reflect_trait_value!(glam::Mat4);

lyra-reflect/src/impls/impl_std.rs

@@ -4,7 +4,7 @@ use crate::List;
 
 use crate::lyra_engine;
 
-use super::{Reflect, ReflectRef, ReflectMut, util};
+use crate::{Reflect, ReflectRef, ReflectMut, util};
 
 impl_reflect_trait_value!(bool);
 impl_reflect_trait_value!(char);

lyra-reflect/src/impls/mod.rs

@@ -0,0 +1,4 @@
+pub mod impl_std;
+
+#[cfg(feature="math")]
+pub mod impl_math;

lyra-reflect/src/lib.rs

@@ -6,6 +6,8 @@ use lyra_ecs::{world::World, DynamicBundle, Component, Entity, ComponentInfo};
 
 extern crate self as lyra_reflect;
 
+pub use lyra_reflect_derive::*;
+
 #[allow(unused_imports)]
 pub(crate) mod lyra_engine {
     pub(crate) mod reflect {
@@ -42,7 +44,7 @@ pub use method::*;
 pub mod registry;
 pub use registry::*;
 
-pub mod impl_std;
+pub mod impls;
 
 pub trait Reflect: Any {
     fn name(&self) -> String;

lyra-reflect/src/reflected_enum.rs

@@ -52,7 +52,6 @@ pub trait Enum: Reflect {
 #[allow(unused_variables)]
 #[cfg(test)]
 mod tests {
-    use lyra_reflect_derive::Reflect;
 
     use super::EnumType;
     use crate::{lyra_engine, Reflect, ReflectRef};

lyra-reflect/src/reflected_struct.rs

@@ -41,7 +41,6 @@ pub trait Struct: Reflect {
 
 #[cfg(test)]
 mod tests {
-    use lyra_reflect_derive::Reflect;
     use crate::{Reflect, ReflectRef, ReflectMut};
     use crate::lyra_engine;
 

lyra-reflect/src/registry.rs

@@ -21,6 +21,12 @@ impl TypeRegistry {
         self.inner.get_mut(&type_id)
     }
 
+    /// Get a registered type, or register a new type and return it.
+    pub fn get_type_or_default(&mut self, type_id: TypeId) -> &mut RegisteredType {
+        self.inner.entry(type_id)
+            .or_insert(RegisteredType::default())
+    }
+
     pub fn register_type<T>(&mut self)
     where
         T: AsRegisteredType + 'static