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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, Attribute, Data, DeriveInput, Ident,
NestedMeta, Variant, Visibility,
};
use crate::utils::{
crate_ident_new, find_attribute_meta, find_nested_meta, parse_item_attributes,
parse_name_attribute, ItemAttribute,
};
fn attribute_has_skip(attrs: &[Attribute]) -> bool {
let meta = find_attribute_meta(attrs, "flags_value").unwrap();
match meta {
None => false,
Some(meta) => find_nested_meta(&meta, "skip").is_some(),
}
}
fn gen_flags_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().filter(|v| { !attribute_has_skip(&v.attrs) } ).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("flags_value", &v.attrs);
let attrs = match attrs {
Ok(attrs) => attrs,
Err(e) => abort_call_site!(
"{}: #[glib::flags] supports only the following optional attributes: #[flags_value(name = \"The Name\", nick = \"the-nick\")] or #[flags_value(skip)]",
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::GFlagsValue {
value: #enum_name::#name.bits(),
value_name: #value_name as *const _ as *const _,
value_nick: #value_nick as *const _ as *const _,
},
}
});
(
quote! {
#(#recurse)*
},
n,
)
}
fn gen_bitflags(
enum_name: &Ident,
visibility: &Visibility,
enum_variants: &Punctuated<Variant, Comma>,
crate_ident: &TokenStream,
) -> TokenStream {
let recurse = enum_variants.iter().map(|v| {
let name = &v.ident;
let disc = v.discriminant.as_ref().expect("missing discriminant");
let value = &disc.1;
quote_spanned! {v.span()=>
const #name = #value;
}
});
quote! {
#crate_ident::bitflags::bitflags! {
#visibility struct #enum_name: u32 {
#(#recurse)*
}
}
}
}
pub fn impl_flags(attrs: &NestedMeta, input: &DeriveInput) -> TokenStream {
let gtype_name = match parse_name_attribute(attrs) {
Ok(name) => name,
Err(e) => abort_call_site!(
"{}: [glib::flags] requires #[glib::flags(name = \"FlagsTypeName\")]",
e
),
};
let name = &input.ident;
let visibility = &input.vis;
let enum_variants = match input.data {
Data::Enum(ref e) => &e.variants,
_ => abort_call_site!("#[glib::flags] only supports enums"),
};
let crate_ident = crate_ident_new();
let bitflags = gen_bitflags(name, visibility, enum_variants, &crate_ident);
let (flags_values, nb_flags_values) = gen_flags_values(name, enum_variants);
quote! {
#bitflags
impl #crate_ident::translate::IntoGlib for #name {
type GlibType = u32;
fn into_glib(self) -> u32 {
self.bits()
}
}
impl #crate_ident::translate::FromGlib<u32> for #name {
unsafe fn from_glib(value: u32) -> Self {
Self::from_bits_truncate(value)
}
}
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_flags(
#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_flags(
#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::GFlagsValue; #nb_flags_values] = [
#flags_values
#crate_ident::gobject_ffi::GFlagsValue {
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_flags_register_static(name.as_ptr(), VALUES.as_ptr());
TYPE = #crate_ident::translate::from_glib(type_);
}
});
unsafe {
assert!(TYPE.is_valid());
TYPE
}
}
}
}
}