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extern crate proc_macro;
use proc_macro::TokenStream;
use quote::quote;
#[proc_macro]
pub fn note_frequencies_32(toks: TokenStream) -> TokenStream {
let middle_a = syn::parse_macro_input!(toks as syn::LitFloat).value();
let notes = (0..128)
.map(|idx| (middle_a * 2.0f64.powf((idx - 69) as f64 / 12.0)) as f32)
.collect::<Vec<_>>();
let out_toks = quote! {
pub const NOTE_FREQUENCIES: [f32; 128] = [
#(#notes),*
];
};
out_toks.into()
}
#[proc_macro]
pub fn note_frequencies_64(toks: TokenStream) -> TokenStream {
let middle_a = syn::parse_macro_input!(toks as syn::LitFloat).value();
let notes = (0..128)
.map(|idx| (middle_a * 2.0f64.powf((idx - 69) as f64 / 12.0)))
.collect::<Vec<_>>();
let out_toks = quote! {
pub const NOTE_FREQUENCIES: [f64; 128] = [
#(#notes),*
];
};
out_toks.into()
}