Add NUMBER builtin function

Author: Xiretza

fluent-bundle/src/builtins.rs

@@ -0,0 +1,14 @@
+use crate::{FluentArgs, FluentValue};
+
+#[allow(non_snake_case)]
+pub fn NUMBER<'a>(positional: &[FluentValue<'a>], named: &FluentArgs) -> FluentValue<'a> {
+    let Some(FluentValue::Number(n)) = positional.first() else {
+        return FluentValue::Error;
+    };
+
+    let mut n = n.clone();
+    n.options.merge(named);
+    println!("{named:?} => {n:?}");
+
+    FluentValue::Number(n)
+}

fluent-bundle/src/lib.rs

@@ -110,6 +110,7 @@ mod message;
 pub mod resolver;
 mod resource;
 pub mod types;
+pub mod builtins;
 
 pub use args::FluentArgs;
 /// Specialized [`FluentBundle`](crate::bundle::FluentBundle) over