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extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro_hack::proc_macro_hack;
use quote::quote;
use syn::{parse_macro_input, LitStr};
use unic_langid_impl::{subtags, LanguageIdentifier};
#[proc_macro_hack]
pub fn lang(input: TokenStream) -> TokenStream {
let id = parse_macro_input!(input as LitStr);
let parsed: subtags::Language = id.value().parse().expect("Malformed Language Subtag");
let lang: Option<u64> = parsed.into();
let lang = if let Some(lang) = lang {
quote!(unsafe { $crate::subtags::Language::from_raw_unchecked(#lang) })
} else {
quote!(None)
};
TokenStream::from(quote! {
#lang
})
}
#[proc_macro_hack]
pub fn script(input: TokenStream) -> TokenStream {
let id = parse_macro_input!(input as LitStr);
let parsed: subtags::Script = id.value().parse().expect("Malformed Script Subtag");
let script: u32 = parsed.into();
TokenStream::from(quote! {
unsafe { $crate::subtags::Script::from_raw_unchecked(#script) }
})
}
#[proc_macro_hack]
pub fn region(input: TokenStream) -> TokenStream {
let id = parse_macro_input!(input as LitStr);
let parsed: subtags::Region = id.value().parse().expect("Malformed Region Subtag");
let region: u32 = parsed.into();
TokenStream::from(quote! {
unsafe { $crate::subtags::Region::from_raw_unchecked(#region) }
})
}
#[proc_macro_hack]
pub fn variant_fn(input: TokenStream) -> TokenStream {
let id = parse_macro_input!(input as LitStr);
let parsed: subtags::Variant = id.value().parse().expect("Malformed Variant Subtag");
let variant: u64 = parsed.into();
TokenStream::from(quote! {
unsafe { $crate::subtags::Variant::from_raw_unchecked(#variant) }
})
}
#[proc_macro_hack]
pub fn langid(input: TokenStream) -> TokenStream {
let id = parse_macro_input!(input as LitStr);
let parsed: LanguageIdentifier = id.value().parse().expect("Malformed Language Identifier");
let (lang, script, region, variants) = parsed.into_parts();
let lang: Option<u64> = lang.into();
let lang = if let Some(lang) = lang {
quote!(unsafe { $crate::subtags::Language::from_raw_unchecked(#lang) })
} else {
quote!($crate::subtags::Language::default())
};
let script = if let Some(script) = script {
let script: u32 = script.into();
quote!(Some(unsafe { $crate::subtags::Script::from_raw_unchecked(#script) }))
} else {
quote!(None)
};
let region = if let Some(region) = region {
let region: u32 = region.into();
quote!(Some(unsafe { $crate::subtags::Region::from_raw_unchecked(#region) }))
} else {
quote!(None)
};
let variants = if !variants.is_empty() {
let v: Vec<_> = variants
.iter()
.map(|v| {
let variant: u64 = v.into();
quote!(unsafe { $crate::subtags::Variant::from_raw_unchecked(#variant) })
})
.collect();
quote!(Some(Box::new([#(#v,)*])))
} else {
quote!(None)
};
TokenStream::from(quote! {
unsafe { $crate::LanguageIdentifier::from_raw_parts_unchecked(#lang, #script, #region, #variants) }
})
}
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