rewrite

mono-fmt-macro/src/to_tokens.rs

@@ -0,0 +1,56 @@
+use proc_macro2::TokenStream;
+use quote::{quote, ToTokens};
+
+use crate::format::{Align, FormatTrait};
+
+pub struct Scoped<'a, T> {
+    export: &'a syn::Path,
+    inner: &'a T,
+}
+
+impl<'a, T> Scoped<'a, T> {
+    pub fn new(export: &'a syn::Path, inner: &'a T) -> Self {
+        Self { export, inner }
+    }
+
+    fn scope<'b, U>(&self, inner: &'b U) -> Scoped<'b, U>
+    where
+        'a: 'b,
+    {
+        Scoped {
+            inner,
+            export: self.export,
+        }
+    }
+
+    fn as_ref(&self) -> &'a T {
+        self.inner
+    }
+}
+
+impl ToTokens for Align {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        tokens.extend(match self {
+            Self::Left => quote! { 1 },
+            Self::Center => quote! { 2 },
+            Self::Right => quote! { 3 },
+        })
+    }
+}
+
+impl ToTokens for FormatTrait {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        match self {
+            FormatTrait::Display => quote!(Display),
+            FormatTrait::Debug => quote!(Debug),
+            FormatTrait::Octal => quote!(Octal),
+            FormatTrait::LowerHex => quote!(LowerHex),
+            FormatTrait::UpperHex => quote!(UpperHex),
+            FormatTrait::Pointer => quote!(Pointer),
+            FormatTrait::Binary => quote!(Binary),
+            FormatTrait::LowerExp => quote!(LowerExp),
+            FormatTrait::UpperExp => quote!(UpperExp),
+        }
+        .to_tokens(tokens)
+    }
+}