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#![deny(missing_docs)]
use quote::quote;
use syn::DeriveInput;
#[proc_macro_derive(Num)]
pub fn num_traits_num(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let ast: DeriveInput = syn::parse(input).unwrap();
let ident = ast.ident;
let mut toks = proc_macro2::TokenStream::new();
toks.extend(quote! {
impl ::num_traits::Num for #ident {
type FromStrRadixErr = ::std::num::ParseIntError;
fn from_str_radix(s: &str, r: u32)-> Result<Self, Self::FromStrRadixErr> {
if s.is_empty() {
return Err(u32::from_str_radix(s, r).err().unwrap());
}
if s == "0" {
return Ok(<Self as ::ff::Field>::zero());
}
let mut res = <Self as ::ff::Field>::zero();
let radix = Self::from(r as u64);
let mut first_digit = true;
for c in s.chars() {
match c.to_digit(r) {
Some(c) => {
if first_digit {
if c == 0 {
return Err(u32::from_str_radix("3", 2).err().unwrap());
}
first_digit = false;
}
res *= &radix;
res += Self::from(c as u64);
}
None => {
return Err(u32::from_str_radix("3", 2).err().unwrap());
}
}
}
Ok(res)
}
}
impl ::num_traits::Zero for #ident {
fn zero() -> Self {
<Self as ::ff::Field>::zero()
}
fn is_zero(&self) -> bool {
<Self as ::ff::Field>::is_zero(self)
}
}
impl ::num_traits::One for #ident {
fn one() -> Self {
<Self as ::ff::Field>::one()
}
fn is_one(&self) -> bool {
self == &<Self as ::ff::Field>::one()
}
}
impl ::std::ops::Div<#ident> for #ident {
type Output = Self;
#[must_use]
fn div(self, rhs: Self) -> Self {
use ::ff::Field;
self * <Self as ::ff::Field>::invert(&rhs).unwrap()
}
}
impl ::std::ops::Div<&#ident> for #ident {
type Output = Self;
fn div(self, rhs: &Self) -> Self {
self * <Self as ::ff::Field>::invert(rhs).unwrap()
}
}
impl ::std::ops::Rem<#ident> for #ident {
type Output = Self;
#[must_use]
fn rem(self, rhs: Self) -> Self {
if <Self as ::ff::Field>::is_zero(&self) {
panic!("divide by zero");
}
<Self as ::ff::Field>::zero()
}
}
impl ::std::ops::Rem<&#ident> for #ident {
type Output = Self;
#[must_use]
fn rem(self, rhs: &Self) -> Self {
if <Self as ::ff::Field>::is_zero(&self) {
panic!("divide by zero");
}
<Self as ::ff::Field>::zero()
}
}
impl ::num_traits::ops::mul_add::MulAdd for #ident {
type Output = Self;
fn mul_add(mut self, a: Self, b: Self) -> Self {
self *= &a;
self += &b;
self
}
}
impl ::num_traits::ops::mul_add::MulAdd<&#ident, &#ident> for #ident {
type Output = Self;
fn mul_add(mut self, a: &Self, b: &Self) -> Self {
self *= a;
self += b;
self
}
}
});
toks.into()
}