Add NUMBER builtin function

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

@@ -99,6 +99,7 @@
 //! the `fluent-bundle` crate directly, while the ecosystem
 //! matures and higher level APIs are being developed.
 mod args;
+pub mod builtins;
 pub mod bundle;
 pub mod concurrent;
 mod entry;