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Exporting custom rust enums is not supported (#54)
Closes #46
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
|
|
||
| use darling::{ | ||
| ast::Data, | ||
| util::{Ignored, WithOriginal}, | ||
| FromDeriveInput, FromVariant, | ||
| }; | ||
| use itertools::Itertools; | ||
| use proc_macro2::TokenStream; | ||
| use quote::{quote, quote_spanned}; | ||
| use syn::{parse_macro_input, spanned::Spanned, DeriveInput, Ident, Meta, Visibility}; | ||
|
|
||
| use crate::type_paths::{convert_error_ty, godot_types, property_hints}; | ||
|
|
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| #[derive(FromDeriveInput)] | ||
| #[darling(supports(enum_unit), attributes(script_enum))] | ||
| struct EnumDeriveInput { | ||
| vis: Visibility, | ||
| ident: Ident, | ||
| export: Option<WithOriginal<(), Meta>>, | ||
| data: Data<EnumVariant, Ignored>, | ||
| } | ||
|
|
||
| #[derive(FromVariant)] | ||
| struct EnumVariant { | ||
| ident: Ident, | ||
| } | ||
|
|
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| pub fn script_enum_derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream { | ||
| let godot_types = godot_types(); | ||
| let convert_error = convert_error_ty(); | ||
| let property_hints = property_hints(); | ||
|
|
||
| let input = parse_macro_input!(input as DeriveInput); | ||
| let input = EnumDeriveInput::from_derive_input(&input).unwrap(); | ||
|
|
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| let enum_ident = input.ident; | ||
| let enum_as_try_from = quote_spanned! {enum_ident.span()=> <#enum_ident as TryFrom<Self::Via>>}; | ||
| let enum_from_self = quote_spanned! {enum_ident.span()=> <Self::Via as From<&#enum_ident>>}; | ||
| let enum_error_ident = Ident::new(&format!("{}Error", enum_ident), enum_ident.span()); | ||
| let enum_visibility = input.vis; | ||
|
|
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| let variants = input.data.take_enum().unwrap(); | ||
|
|
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| let (from_variants, into_variants, hint_strings): (TokenStream, TokenStream, Vec<_>) = variants | ||
| .iter() | ||
| .enumerate() | ||
| .map(|(index, variant)| { | ||
| let variant_ident = &variant.ident; | ||
| let index = index as u8; | ||
|
|
||
| ( | ||
| quote_spanned! {variant_ident.span()=> #enum_ident::#variant_ident => #index,}, | ||
| quote_spanned! {variant_ident.span()=> #index => Ok(#enum_ident::#variant_ident),}, | ||
| format!("{variant_ident}:{index}"), | ||
| ) | ||
| }) | ||
| .multiunzip(); | ||
| let enum_property_hint_str = hint_strings.join(","); | ||
|
|
||
| let derive_export = input.export.map(|export| { | ||
| quote_spanned! {export.original.span()=> | ||
| impl ::godot_rust_script::GodotScriptExport for #enum_ident { | ||
| fn hint(custom: Option<#property_hints>) -> #property_hints { | ||
| if let Some(custom) = custom { | ||
| return custom; | ||
| } | ||
|
|
||
| #property_hints::ENUM | ||
| } | ||
|
|
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| fn hint_string(_custom_hint: Option<#property_hints>, custom_string: Option<String>) -> String { | ||
| if let Some(custom_string) = custom_string { | ||
| return custom_string; | ||
| } | ||
|
|
||
| String::from(#enum_property_hint_str) | ||
| } | ||
| } | ||
| } | ||
| }); | ||
|
|
||
| let derived = quote! { | ||
| impl #godot_types::meta::FromGodot for #enum_ident { | ||
| fn try_from_godot(via: Self::Via) -> Result<Self, #convert_error> { | ||
| #enum_as_try_from::try_from(via) | ||
| .map_err(|err| #convert_error::with_error_value(err, via)) | ||
| } | ||
| } | ||
|
|
||
| impl #godot_types::meta::ToGodot for #enum_ident { | ||
| fn to_godot(&self) -> Self::Via { | ||
| #enum_from_self::from(self) | ||
| } | ||
| } | ||
|
|
||
| impl #godot_types::meta::GodotConvert for #enum_ident { | ||
| type Via = u8; | ||
| } | ||
|
|
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| impl GodotScriptEnum for #enum_ident {} | ||
|
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| impl From<&#enum_ident> for u8 { | ||
| fn from(value: &#enum_ident) -> Self { | ||
| match value { | ||
| #from_variants | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| #enum_visibility struct #enum_error_ident(u8); | ||
|
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| impl ::std::fmt::Display for #enum_error_ident { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { | ||
| write!(f, "Enum value {} is out of range.", self.0) | ||
| } | ||
| } | ||
|
|
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| impl ::std::error::Error for #enum_error_ident {} | ||
|
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| impl TryFrom<u8> for #enum_ident { | ||
| type Error = #enum_error_ident; | ||
|
|
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| fn try_from(value: u8) -> ::std::result::Result<Self, Self::Error> { | ||
| match value { | ||
| #into_variants | ||
| _ => Err(#enum_error_ident(value)), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #derive_export | ||
| }; | ||
|
|
||
| derived.into() | ||
| } |
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