use quote::{ToTokens, TokenStreamExt};
use proc_macro2::{Span, TokenStream};
use syn;
#[derive(Debug, Default, Clone)]
pub struct DeprecationNotes(Vec<String>);
impl ToTokens for DeprecationNotes {
fn to_tokens(&self, tokens: &mut TokenStream) {
for note in &self.0 {
let fn_ident = syn::Ident::new("derive_builder_core_deprecation_note", Span::call_site());
tokens.append_all(quote!(
{
#[deprecated(note=#note)]
fn #fn_ident() { }
#fn_ident();
}
));
}
}
}
impl DeprecationNotes {
pub fn push(&mut self, note: String) {
self.0.push(note)
}
pub fn extend(&mut self, other: &DeprecationNotes) {
for x in &other.0 {
self.0.push(x.to_owned())
}
}
pub fn as_item(&self) -> DeprecationNotesAsItem {
DeprecationNotesAsItem(self)
}
}
#[derive(Debug)]
pub struct DeprecationNotesAsItem<'a>(&'a DeprecationNotes);
impl<'a> ToTokens for DeprecationNotesAsItem<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
let deprecation_notes = self.0;
if !deprecation_notes.0.is_empty() {
tokens.append_all(quote!(
#[doc(hidden)]
fn derive_builder_core_deprecation_note() {
#deprecation_notes
}
))
}
}
}
#[test]
fn deprecation_note() {
let mut note = DeprecationNotes::default();
note.push("Some Warning".to_string());
assert_eq!(
quote!(#note).to_string(),
quote!({
#[deprecated(note = "Some Warning")]
fn derive_builder_core_deprecation_note() {}
derive_builder_core_deprecation_note();
}).to_string()
);
}