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mod load_locale;
use proc_macro::TokenStream;
use std::path::Path;
use once_cell::unsync::Lazy;
use load_locale::{load_locale, LocaleMap};
thread_local! {
static LOCALE_MAP: Lazy<LocaleMap> = Lazy::new(load_locales_from_env);
}
fn load_locales_from_env() -> LocaleMap {
let locale_path = option_env!("LOCALE_PATH");
if let Some(locale_path) = locale_path.map(|path| Path::new(path)) {
let locale_path = if locale_path.is_relative() {
i18n_find_locale::find_locale(locale_path)
} else {
locale_path.to_path_buf()
};
if !locale_path.is_dir() {
panic!(
"locale path is not exists or not a directory! :{:?}",
locale_path
);
}
load_locale(locale_path)
} else {
Default::default()
}
}
#[proc_macro]
pub fn check_language(code: TokenStream) -> TokenStream {
let code = syn::parse_macro_input!(code as syn::LitStr).value();
LOCALE_MAP.with(|lm| {
assert!(lm.contains_key(&code), "Locale {} does not exist!", &code);
});
TokenStream::default()
}
#[proc_macro]
pub fn check_field(field: TokenStream) -> TokenStream {
let field = syn::parse_macro_input!(field as syn::LitStr).value();
LOCALE_MAP.with(|lm| {
assert!(
lm.values().all(|lsm| lsm.contains_key(&field)),
"Field {} does not exist!",
&field
);
});
TokenStream::default()
}
#[proc_macro]
pub fn build_match_func(_: TokenStream) -> TokenStream {
let mut match1 = proc_macro2::TokenStream::new();
let mut codes = proc_macro2::TokenStream::new();
LOCALE_MAP.with(|locale_map| {
for (code, lsm) in locale_map.iter() {
let mut match2 = proc_macro2::TokenStream::new();
for (k, v) in lsm.iter() {
match2.extend(quote::quote! {
#k => Some(#v),
});
}
match1.extend(quote::quote! {
#code => {
match field.as_ref() {
#match2
_ => None
}
},
});
codes.extend(quote::quote! {
#code,
});
}
});
(quote::quote! {
#[inline(never)]
pub fn _match_message<S>(lang_code: S, field: S) -> Option<&'static str> where S: AsRef<str> {
match lang_code.as_ref() {
#match1
_ => None
}
}
#[inline]
pub fn _langs() -> &'static [&'static str] {
&[#codes]
}
})
.into()
}