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use heck::{ToKebabCase, ToUpperCamelCase};
use proc_macro2::TokenStream;
use proc_macro_error::abort_call_site;
use quote::{quote, quote_spanned};
use syn::{punctuated::Punctuated, spanned::Spanned, token::Comma, Data, Ident, Variant};
use crate::utils::{
crate_ident_new, gen_enum_from_glib, parse_item_attributes, parse_name, ItemAttribute,
};
fn gen_enum_values(
enum_name: &Ident,
enum_variants: &Punctuated<Variant, Comma>,
) -> (TokenStream, usize) {
let crate_ident = crate_ident_new();
let mut n = 1;
let recurse = enum_variants.iter().map(|v| {
let name = &v.ident;
let mut value_name = name.to_string().to_upper_camel_case();
let mut value_nick = name.to_string().to_kebab_case();
let attrs = parse_item_attributes("enum_value", &v.attrs);
let attrs = match attrs {
Ok(attrs) => attrs,
Err(e) => abort_call_site!(
"{}: derive(glib::Enum) enum supports only the following optional attributes: #[enum_value(name = \"The Cat\", nick = \"chat\")]",
e
),
};
attrs.into_iter().for_each(|attr|
match attr {
ItemAttribute::Name(n) => value_name = n,
ItemAttribute::Nick(n) => value_nick = n,
}
);
let value_name = format!("{value_name}\0");
let value_nick = format!("{value_nick}\0");
n += 1;
quote_spanned! {v.span()=>
#crate_ident::gobject_ffi::GEnumValue {
value: #enum_name::#name as i32,
value_name: #value_name as *const _ as *const _,
value_nick: #value_nick as *const _ as *const _,
},
}
});
(
quote! {
#(#recurse)*
},
n,
)
}
pub fn impl_enum(input: &syn::DeriveInput) -> TokenStream {
let name = &input.ident;
let enum_variants = match input.data {
Data::Enum(ref e) => &e.variants,
_ => abort_call_site!("#[derive(glib::Enum)] only supports enums"),
};
let gtype_name = match parse_name(input, "enum_type") {
Ok(name) => name,
Err(e) => abort_call_site!(
"{}: #[derive(glib::Enum)] requires #[enum_type(name = \"EnumTypeName\")]",
e
),
};
let from_glib = gen_enum_from_glib(name, enum_variants);
let (enum_values, nb_enum_values) = gen_enum_values(name, enum_variants);
let crate_ident = crate_ident_new();
quote! {
impl #crate_ident::translate::IntoGlib for #name {
type GlibType = i32;
fn into_glib(self) -> i32 {
self as i32
}
}
impl #crate_ident::translate::TryFromGlib<i32> for #name {
type Error = i32;
unsafe fn try_from_glib(value: i32) -> ::core::result::Result<Self, i32> {
let from_glib = || {
#from_glib
};
from_glib().ok_or(value)
}
}
impl #crate_ident::translate::FromGlib<i32> for #name {
unsafe fn from_glib(value: i32) -> Self {
use #crate_ident::translate::TryFromGlib;
Self::try_from_glib(value).unwrap()
}
}
impl #crate_ident::value::ValueType for #name {
type Type = Self;
}
unsafe impl<'a> #crate_ident::value::FromValue<'a> for #name {
type Checker = #crate_ident::value::GenericValueTypeChecker<Self>;
unsafe fn from_value(value: &'a #crate_ident::value::Value) -> Self {
#crate_ident::translate::from_glib(#crate_ident::gobject_ffi::g_value_get_enum(
#crate_ident::translate::ToGlibPtr::to_glib_none(value).0
))
}
}
impl #crate_ident::value::ToValue for #name {
fn to_value(&self) -> #crate_ident::value::Value {
let mut value = #crate_ident::value::Value::for_value_type::<Self>();
unsafe {
#crate_ident::gobject_ffi::g_value_set_enum(
#crate_ident::translate::ToGlibPtrMut::to_glib_none_mut(&mut value).0,
#crate_ident::translate::IntoGlib::into_glib(*self)
)
}
value
}
fn value_type(&self) -> #crate_ident::Type {
<Self as #crate_ident::StaticType>::static_type()
}
}
impl #crate_ident::StaticType for #name {
fn static_type() -> #crate_ident::Type {
static ONCE: ::std::sync::Once = ::std::sync::Once::new();
static mut TYPE: #crate_ident::Type = #crate_ident::Type::INVALID;
ONCE.call_once(|| {
static mut VALUES: [#crate_ident::gobject_ffi::GEnumValue; #nb_enum_values] = [
#enum_values
#crate_ident::gobject_ffi::GEnumValue {
value: 0,
value_name: ::std::ptr::null(),
value_nick: ::std::ptr::null(),
},
];
let name = ::std::ffi::CString::new(#gtype_name).expect("CString::new failed");
unsafe {
let type_ = #crate_ident::gobject_ffi::g_enum_register_static(name.as_ptr(), VALUES.as_ptr());
TYPE = #crate_ident::translate::from_glib(type_);
}
});
unsafe {
assert!(TYPE.is_valid());
TYPE
}
}
}
}
}