1 files changed, 108 insertions, 0 deletions
diff --git a/third_party/rust/unic-langid-macros-impl/src/lib.rs b/third_party/rust/unic-langid-macros-impl/src/lib.rs
new file mode 100644
index 0000000000..ee27a51e81
--- /dev/null
+++ b/third_party/rust/unic-langid-macros-impl/src/lib.rs
@@ -0,0 +1,108 @@
+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) }
+    })
+}