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Merge pull request #4 from IamTheCarl/devel
0.6 update
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| [package] | ||
| name = "macros" | ||
| version = "0.1.0" | ||
| edition = "2021" | ||
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| [lib] | ||
| proc-macro = true | ||
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| [dependencies] | ||
| quote = "1.0" | ||
| syn = { version = "2.0", features = ["derive"] } | ||
| proc-macro2 = "1.0" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| use proc_macro::TokenStream; | ||
| use quote::quote; | ||
| use syn::{parse_macro_input, DeriveInput, Fields, Meta}; | ||
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| #[proc_macro_derive(Struct, attributes(default))] | ||
| pub fn derive_struct(input: TokenStream) -> TokenStream { | ||
| let input = parse_macro_input!(input as DeriveInput); | ||
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| let struct_name = input.ident; | ||
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| let contains_span = input.generics.type_params().any(|param| param.ident == "S"); | ||
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| let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl(); | ||
| let struct_name_string = struct_name.to_string(); | ||
| let struct_definition_name = struct_name.to_string(); | ||
| let struct_definition_name2 = struct_definition_name.clone(); | ||
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| let function_generics = if !contains_span { | ||
| quote! { <S: crate::script::parsing::Span> } | ||
| } else { | ||
| quote! {} | ||
| }; | ||
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| let fields = match input.data { | ||
| syn::Data::Struct(data) => match data.fields { | ||
| Fields::Named(fields) => fields.named, | ||
| _ => panic!("Struct must have named fields."), | ||
| }, | ||
| _ => { | ||
| panic!("Only structs can be made available to scripts."); | ||
| } | ||
| }; | ||
| let define_fields = fields.clone().into_iter().map(|field| { | ||
| let name = field.ident.unwrap().to_string(); | ||
| let ty = field.ty; | ||
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| let mut default = quote! { None }; | ||
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| for attribute in field.attrs.iter() { | ||
| if let Meta::NameValue(name_value) = &attribute.meta { | ||
| if name_value.path.is_ident("default") { | ||
| let value = &name_value.value; | ||
| default = quote! { Some(crate::script::parsing::Litteral::parse(S::from_str(#value)).unwrap().1) }; | ||
| } | ||
| } | ||
| } | ||
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| quote! { | ||
| MemberVariable { | ||
| name: S::from_str(#name), | ||
| ty: MemberVariableType { | ||
| ty: <#ty as crate::script::execution::types::TypedObject>::get_type(), | ||
| constraints: None, | ||
| default_value: #default, | ||
| } | ||
| } | ||
| } | ||
| }); | ||
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| let extract_fields = fields.clone().into_iter().map(|field| { | ||
| let name = field.ident.unwrap(); | ||
| let name_string = name.to_string(); | ||
| let ty = field.ty; | ||
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| quote! { | ||
| let #name = members.remove(#name_string).unwrap(); | ||
| let #name = #name.downcast::<#ty>(span)?; | ||
| } | ||
| }); | ||
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| let import_fields = fields.clone().into_iter().map(|field| { | ||
| let name = field.ident.unwrap(); | ||
| quote! { #name } | ||
| }); | ||
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| quote! { | ||
| impl #impl_generics #struct_name #ty_generics #where_clause { | ||
| pub fn unpack_struct #function_generics (span: &S, structure: crate::script::execution::types::Structure<S>) -> std::result::Result<Self, crate::script::execution::Failure<S>> { | ||
| // Check that it's the correct type. | ||
| if structure.name() == #struct_name_string { | ||
| let mut members = Rc::unwrap_or_clone(structure.members); | ||
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| // Extract fields. | ||
| #(#extract_fields)* | ||
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| // Import fields into the struct. | ||
| Ok(#struct_name { | ||
| #(#import_fields),* | ||
| }) | ||
| } else { | ||
| Err(crate::script::execution::Failure::ExpectedGot(span.clone(), #struct_name_string.into(), structure.name().to_string().into())) | ||
| } | ||
| } | ||
| } | ||
| impl #impl_generics #struct_name #ty_generics #where_clause { | ||
| fn define_struct #function_generics (context: &mut crate::script::execution::ExecutionContext<'_, S>) { | ||
| context.stack.new_variable_str( | ||
| #struct_definition_name, | ||
| StructDefinition { | ||
| definition: Rc::new(parsing::StructDefinition { | ||
| name: S::from_str(#struct_definition_name2), | ||
| members: vec![ | ||
| #(#define_fields),* | ||
| ], | ||
| }), | ||
| } | ||
| .into(), | ||
| ); | ||
| } | ||
| } | ||
| }.into() | ||
| } |
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