959 lines
31 KiB
Rust
959 lines
31 KiB
Rust
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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![crate_type = "proc-macro"]
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#![doc(html_root_url = "https://docs.rs/num-derive/0.3")]
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#![recursion_limit = "512"]
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//! Procedural macros to derive numeric traits in Rust.
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//!
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//! ## Usage
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//!
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//! Add this to your `Cargo.toml`:
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//!
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//! ```toml
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//! [dependencies]
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//! num-traits = "0.2"
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//! num-derive = "0.3"
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//! ```
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//!
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//! Then you can derive traits on your own types:
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//!
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//! ```rust
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//! #[macro_use]
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//! extern crate num_derive;
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//!
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//! #[derive(FromPrimitive, ToPrimitive)]
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//! enum Color {
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//! Red,
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//! Blue,
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//! Green,
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//! }
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//! # fn main() {}
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//! ```
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//!
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//! ## Explicit import
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//!
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//! By default the `num_derive` procedural macros assume that the
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//! `num_traits` crate is a direct dependency. If `num_traits` is instead
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//! a transitive dependency, the `num_traits` helper attribute can be
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//! used to tell `num_derive` to use a specific identifier for its imports.
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//!
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//! ```rust
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//! #[macro_use]
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//! extern crate num_derive;
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//! // Lets pretend this is a transitive dependency from another crate
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//! // reexported as `some_other_ident`.
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//! extern crate num_traits as some_other_ident;
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//!
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//! #[derive(FromPrimitive, ToPrimitive)]
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//! #[num_traits = "some_other_ident"]
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//! enum Color {
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//! Red,
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//! Blue,
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//! Green,
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//! }
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//! # fn main() {}
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//! ```
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extern crate proc_macro;
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use proc_macro::TokenStream;
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use proc_macro2::{Span, TokenStream as TokenStream2};
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use quote::quote;
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use syn::{Data, Fields, Ident};
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/// Try to parse the tokens, or else return a compilation error
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/// suggesting "full-syntax" if that's not already enabled.
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macro_rules! parse {
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($tokens:ident as $type:ty) => {
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match syn::parse::<$type>($tokens) {
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Ok(parsed) => parsed,
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Err(mut error) => {
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if cfg!(not(feature = "full-syntax")) {
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let hint = syn::Error::new(
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Span::call_site(),
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r#"this might need the "full-syntax" feature of `num-derive`"#,
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);
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error.combine(hint);
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}
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return TokenStream::from(error.to_compile_error());
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}
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}
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};
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}
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// Within `exp`, you can bring things into scope with `extern crate`.
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//
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// We don't want to assume that `num_traits::` is in scope - the user may have imported it under a
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// different name, or may have imported it in a non-toplevel module (common when putting impls
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// behind a feature gate).
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//
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// Solution: let's just generate `extern crate num_traits as _num_traits` and then refer to
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// `_num_traits` in the derived code. However, macros are not allowed to produce `extern crate`
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// statements at the toplevel.
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//
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// Solution: let's generate `mod _impl_foo` and import num_traits within that. However, now we
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// lose access to private members of the surrounding module. This is a problem if, for example,
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// we're deriving for a newtype, where the inner type is defined in the same module, but not
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// exported.
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//
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// Solution: use the dummy const trick. For some reason, `extern crate` statements are allowed
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// here, but everything from the surrounding module is in scope. This trick is taken from serde.
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fn dummy_const_trick(trait_: &str, name: &Ident, exp: TokenStream2) -> TokenStream2 {
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let dummy_const = Ident::new(
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&format!("_IMPL_NUM_{}_FOR_{}", trait_, unraw(name)),
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Span::call_site(),
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);
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quote! {
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#[allow(non_upper_case_globals, unused_qualifications)]
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const #dummy_const: () = {
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#[allow(clippy::useless_attribute)]
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#[allow(rust_2018_idioms)]
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extern crate num_traits as _num_traits;
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#exp
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};
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}
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}
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fn unraw(ident: &Ident) -> String {
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ident.to_string().trim_start_matches("r#").to_owned()
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}
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// If `data` is a newtype, return the type it's wrapping.
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fn newtype_inner(data: &syn::Data) -> Option<syn::Type> {
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match *data {
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Data::Struct(ref s) => {
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match s.fields {
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Fields::Unnamed(ref fs) => {
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if fs.unnamed.len() == 1 {
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Some(fs.unnamed[0].ty.clone())
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} else {
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None
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}
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}
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Fields::Named(ref fs) => {
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if fs.named.len() == 1 {
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panic!("num-derive doesn't know how to handle newtypes with named fields yet. \
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Please use a tuple-style newtype, or submit a PR!");
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}
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None
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}
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_ => None,
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}
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}
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_ => None,
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}
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}
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struct NumTraits {
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import: Ident,
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explicit: bool,
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}
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impl quote::ToTokens for NumTraits {
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fn to_tokens(&self, tokens: &mut TokenStream2) {
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self.import.to_tokens(tokens);
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}
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}
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impl NumTraits {
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fn new(ast: &syn::DeriveInput) -> Self {
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// If there is a `num_traits` MetaNameValue attribute on the input,
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// retrieve its value, and use it to create an `Ident` to be used
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// to import the `num_traits` crate.
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for attr in &ast.attrs {
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if let Ok(syn::Meta::NameValue(mnv)) = attr.parse_meta() {
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if mnv.path.is_ident("num_traits") {
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if let syn::Lit::Str(lit_str) = mnv.lit {
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return NumTraits {
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import: syn::Ident::new(&lit_str.value(), lit_str.span()),
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explicit: true,
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};
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} else {
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panic!("#[num_traits] attribute value must be a str");
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}
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}
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}
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}
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// Otherwise, we'll implicitly import our own.
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NumTraits {
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import: Ident::new("_num_traits", Span::call_site()),
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explicit: false,
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}
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}
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fn wrap(&self, trait_: &str, name: &Ident, output: TokenStream2) -> TokenStream2 {
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if self.explicit {
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output
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} else {
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dummy_const_trick(trait_, &name, output)
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}
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}
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}
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/// Derives [`num_traits::FromPrimitive`][from] for simple enums and newtypes.
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///
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/// [from]: https://docs.rs/num-traits/0.2/num_traits/cast/trait.FromPrimitive.html
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///
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/// # Examples
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///
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/// Simple enums can be derived:
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///
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/// ```rust
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/// # #[macro_use]
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/// # extern crate num_derive;
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///
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/// #[derive(FromPrimitive)]
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/// enum Color {
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/// Red,
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/// Blue,
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/// Green = 42,
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/// }
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/// # fn main() {}
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/// ```
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///
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/// Enums that contain data are not allowed:
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///
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/// ```compile_fail
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/// # #[macro_use]
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/// # extern crate num_derive;
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///
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/// #[derive(FromPrimitive)]
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/// enum Color {
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/// Rgb(u8, u8, u8),
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/// Hsv(u8, u8, u8),
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/// }
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/// # fn main() {}
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/// ```
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///
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/// Structs are not allowed:
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///
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/// ```compile_fail
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/// # #[macro_use]
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/// # extern crate num_derive;
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/// #[derive(FromPrimitive)]
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/// struct Color {
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/// r: u8,
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/// g: u8,
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/// b: u8,
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/// }
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/// # fn main() {}
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/// ```
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#[proc_macro_derive(FromPrimitive, attributes(num_traits))]
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pub fn from_primitive(input: TokenStream) -> TokenStream {
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let ast = parse!(input as syn::DeriveInput);
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let name = &ast.ident;
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let import = NumTraits::new(&ast);
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let impl_ = if let Some(inner_ty) = newtype_inner(&ast.data) {
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quote! {
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impl #import::FromPrimitive for #name {
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#[inline]
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fn from_i64(n: i64) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_i64(n).map(#name)
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}
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#[inline]
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fn from_u64(n: u64) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_u64(n).map(#name)
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}
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#[inline]
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fn from_isize(n: isize) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_isize(n).map(#name)
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}
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#[inline]
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fn from_i8(n: i8) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_i8(n).map(#name)
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}
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#[inline]
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fn from_i16(n: i16) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_i16(n).map(#name)
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}
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#[inline]
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fn from_i32(n: i32) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_i32(n).map(#name)
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}
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#[inline]
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fn from_i128(n: i128) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_i128(n).map(#name)
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}
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#[inline]
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fn from_usize(n: usize) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_usize(n).map(#name)
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}
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#[inline]
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fn from_u8(n: u8) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_u8(n).map(#name)
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}
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#[inline]
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fn from_u16(n: u16) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_u16(n).map(#name)
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}
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#[inline]
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fn from_u32(n: u32) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_u32(n).map(#name)
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}
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#[inline]
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fn from_u128(n: u128) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_u128(n).map(#name)
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}
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#[inline]
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fn from_f32(n: f32) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_f32(n).map(#name)
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}
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#[inline]
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fn from_f64(n: f64) -> Option<Self> {
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<#inner_ty as #import::FromPrimitive>::from_f64(n).map(#name)
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}
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}
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}
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} else {
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let variants = match ast.data {
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Data::Enum(ref data_enum) => &data_enum.variants,
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_ => panic!(
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"`FromPrimitive` can be applied only to enums and newtypes, {} is neither",
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name
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),
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};
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let from_i64_var = quote! { n };
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let clauses: Vec<_> = variants
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.iter()
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.map(|variant| {
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let ident = &variant.ident;
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match variant.fields {
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Fields::Unit => (),
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_ => panic!(
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"`FromPrimitive` can be applied only to unitary enums and newtypes, \
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{}::{} is either struct or tuple",
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name, ident
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),
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}
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quote! {
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if #from_i64_var == #name::#ident as i64 {
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Some(#name::#ident)
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}
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}
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})
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.collect();
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let from_i64_var = if clauses.is_empty() {
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quote!(_)
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} else {
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from_i64_var
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};
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quote! {
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impl #import::FromPrimitive for #name {
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#[allow(trivial_numeric_casts)]
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#[inline]
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fn from_i64(#from_i64_var: i64) -> Option<Self> {
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#(#clauses else)* {
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None
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}
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}
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#[inline]
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fn from_u64(n: u64) -> Option<Self> {
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Self::from_i64(n as i64)
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}
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}
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}
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};
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import.wrap("FromPrimitive", &name, impl_).into()
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}
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|
||
|
|
/// Derives [`num_traits::ToPrimitive`][to] for simple enums and newtypes.
|
||
|
|
///
|
||
|
|
/// [to]: https://docs.rs/num-traits/0.2/num_traits/cast/trait.ToPrimitive.html
|
||
|
|
///
|
||
|
|
/// # Examples
|
||
|
|
///
|
||
|
|
/// Simple enums can be derived:
|
||
|
|
///
|
||
|
|
/// ```rust
|
||
|
|
/// # #[macro_use]
|
||
|
|
/// # extern crate num_derive;
|
||
|
|
///
|
||
|
|
/// #[derive(ToPrimitive)]
|
||
|
|
/// enum Color {
|
||
|
|
/// Red,
|
||
|
|
/// Blue,
|
||
|
|
/// Green = 42,
|
||
|
|
/// }
|
||
|
|
/// # fn main() {}
|
||
|
|
/// ```
|
||
|
|
///
|
||
|
|
/// Enums that contain data are not allowed:
|
||
|
|
///
|
||
|
|
/// ```compile_fail
|
||
|
|
/// # #[macro_use]
|
||
|
|
/// # extern crate num_derive;
|
||
|
|
///
|
||
|
|
/// #[derive(ToPrimitive)]
|
||
|
|
/// enum Color {
|
||
|
|
/// Rgb(u8, u8, u8),
|
||
|
|
/// Hsv(u8, u8, u8),
|
||
|
|
/// }
|
||
|
|
/// # fn main() {}
|
||
|
|
/// ```
|
||
|
|
///
|
||
|
|
/// Structs are not allowed:
|
||
|
|
///
|
||
|
|
/// ```compile_fail
|
||
|
|
/// # #[macro_use]
|
||
|
|
/// # extern crate num_derive;
|
||
|
|
/// #[derive(ToPrimitive)]
|
||
|
|
/// struct Color {
|
||
|
|
/// r: u8,
|
||
|
|
/// g: u8,
|
||
|
|
/// b: u8,
|
||
|
|
/// }
|
||
|
|
/// # fn main() {}
|
||
|
|
/// ```
|
||
|
|
#[proc_macro_derive(ToPrimitive, attributes(num_traits))]
|
||
|
|
pub fn to_primitive(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
|
||
|
|
let import = NumTraits::new(&ast);
|
||
|
|
|
||
|
|
let impl_ = if let Some(inner_ty) = newtype_inner(&ast.data) {
|
||
|
|
quote! {
|
||
|
|
impl #import::ToPrimitive for #name {
|
||
|
|
#[inline]
|
||
|
|
fn to_i64(&self) -> Option<i64> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_i64(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_u64(&self) -> Option<u64> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_u64(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_isize(&self) -> Option<isize> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_isize(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_i8(&self) -> Option<i8> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_i8(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_i16(&self) -> Option<i16> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_i16(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_i32(&self) -> Option<i32> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_i32(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_i128(&self) -> Option<i128> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_i128(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_usize(&self) -> Option<usize> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_usize(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_u8(&self) -> Option<u8> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_u8(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_u16(&self) -> Option<u16> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_u16(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_u32(&self) -> Option<u32> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_u32(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_u128(&self) -> Option<u128> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_u128(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_f32(&self) -> Option<f32> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_f32(&self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_f64(&self) -> Option<f64> {
|
||
|
|
<#inner_ty as #import::ToPrimitive>::to_f64(&self.0)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
let variants = match ast.data {
|
||
|
|
Data::Enum(ref data_enum) => &data_enum.variants,
|
||
|
|
_ => panic!(
|
||
|
|
"`ToPrimitive` can be applied only to enums and newtypes, {} is neither",
|
||
|
|
name
|
||
|
|
),
|
||
|
|
};
|
||
|
|
|
||
|
|
let variants: Vec<_> = variants
|
||
|
|
.iter()
|
||
|
|
.map(|variant| {
|
||
|
|
let ident = &variant.ident;
|
||
|
|
match variant.fields {
|
||
|
|
Fields::Unit => (),
|
||
|
|
_ => {
|
||
|
|
panic!("`ToPrimitive` can be applied only to unitary enums and newtypes, {}::{} is either struct or tuple", name, ident)
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
// NB: We have to check each variant individually, because we'll only have `&self`
|
||
|
|
// for the input. We can't move from that, and it might not be `Clone` or `Copy`.
|
||
|
|
// (Otherwise we could just do `*self as i64` without a `match` at all.)
|
||
|
|
quote!(#name::#ident => #name::#ident as i64)
|
||
|
|
})
|
||
|
|
.collect();
|
||
|
|
|
||
|
|
let match_expr = if variants.is_empty() {
|
||
|
|
// No variants found, so do not use Some to not to trigger `unreachable_code` lint
|
||
|
|
quote! {
|
||
|
|
match *self {}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
quote! {
|
||
|
|
Some(match *self {
|
||
|
|
#(#variants,)*
|
||
|
|
})
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
quote! {
|
||
|
|
impl #import::ToPrimitive for #name {
|
||
|
|
#[inline]
|
||
|
|
#[allow(trivial_numeric_casts)]
|
||
|
|
fn to_i64(&self) -> Option<i64> {
|
||
|
|
#match_expr
|
||
|
|
}
|
||
|
|
|
||
|
|
#[inline]
|
||
|
|
fn to_u64(&self) -> Option<u64> {
|
||
|
|
self.to_i64().map(|x| x as u64)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
import.wrap("ToPrimitive", &name, impl_).into()
|
||
|
|
}
|
||
|
|
|
||
|
|
const NEWTYPE_ONLY: &str = "This trait can only be derived for newtypes";
|
||
|
|
|
||
|
|
/// Derives [`num_traits::NumOps`][num_ops] for newtypes. The inner type must already implement
|
||
|
|
/// `NumOps`.
|
||
|
|
///
|
||
|
|
/// [num_ops]: https://docs.rs/num-traits/0.2/num_traits/trait.NumOps.html
|
||
|
|
///
|
||
|
|
/// Note that, since `NumOps` is really a trait alias for `Add + Sub + Mul + Div + Rem`, this macro
|
||
|
|
/// generates impls for _those_ traits. Furthermore, in all generated impls, `RHS=Self` and
|
||
|
|
/// `Output=Self`.
|
||
|
|
#[proc_macro_derive(NumOps)]
|
||
|
|
pub fn num_ops(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
let inner_ty = newtype_inner(&ast.data).expect(NEWTYPE_ONLY);
|
||
|
|
let impl_ = quote! {
|
||
|
|
impl ::core::ops::Add for #name {
|
||
|
|
type Output = Self;
|
||
|
|
#[inline]
|
||
|
|
fn add(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as ::core::ops::Add>::add(self.0, other.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
impl ::core::ops::Sub for #name {
|
||
|
|
type Output = Self;
|
||
|
|
#[inline]
|
||
|
|
fn sub(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as ::core::ops::Sub>::sub(self.0, other.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
impl ::core::ops::Mul for #name {
|
||
|
|
type Output = Self;
|
||
|
|
#[inline]
|
||
|
|
fn mul(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as ::core::ops::Mul>::mul(self.0, other.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
impl ::core::ops::Div for #name {
|
||
|
|
type Output = Self;
|
||
|
|
#[inline]
|
||
|
|
fn div(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as ::core::ops::Div>::div(self.0, other.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
impl ::core::ops::Rem for #name {
|
||
|
|
type Output = Self;
|
||
|
|
#[inline]
|
||
|
|
fn rem(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as ::core::ops::Rem>::rem(self.0, other.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
impl_.into()
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Derives [`num_traits::NumCast`][num_cast] for newtypes. The inner type must already implement
|
||
|
|
/// `NumCast`.
|
||
|
|
///
|
||
|
|
/// [num_cast]: https://docs.rs/num-traits/0.2/num_traits/cast/trait.NumCast.html
|
||
|
|
#[proc_macro_derive(NumCast, attributes(num_traits))]
|
||
|
|
pub fn num_cast(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
let inner_ty = newtype_inner(&ast.data).expect(NEWTYPE_ONLY);
|
||
|
|
|
||
|
|
let import = NumTraits::new(&ast);
|
||
|
|
|
||
|
|
let impl_ = quote! {
|
||
|
|
impl #import::NumCast for #name {
|
||
|
|
#[inline]
|
||
|
|
fn from<T: #import::ToPrimitive>(n: T) -> Option<Self> {
|
||
|
|
<#inner_ty as #import::NumCast>::from(n).map(#name)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
import.wrap("NumCast", &name, impl_).into()
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Derives [`num_traits::Zero`][zero] for newtypes. The inner type must already implement `Zero`.
|
||
|
|
///
|
||
|
|
/// [zero]: https://docs.rs/num-traits/0.2/num_traits/identities/trait.Zero.html
|
||
|
|
#[proc_macro_derive(Zero, attributes(num_traits))]
|
||
|
|
pub fn zero(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
let inner_ty = newtype_inner(&ast.data).expect(NEWTYPE_ONLY);
|
||
|
|
|
||
|
|
let import = NumTraits::new(&ast);
|
||
|
|
|
||
|
|
let impl_ = quote! {
|
||
|
|
impl #import::Zero for #name {
|
||
|
|
#[inline]
|
||
|
|
fn zero() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Zero>::zero())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_zero(&self) -> bool {
|
||
|
|
<#inner_ty as #import::Zero>::is_zero(&self.0)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
import.wrap("Zero", &name, impl_).into()
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Derives [`num_traits::One`][one] for newtypes. The inner type must already implement `One`.
|
||
|
|
///
|
||
|
|
/// [one]: https://docs.rs/num-traits/0.2/num_traits/identities/trait.One.html
|
||
|
|
#[proc_macro_derive(One, attributes(num_traits))]
|
||
|
|
pub fn one(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
let inner_ty = newtype_inner(&ast.data).expect(NEWTYPE_ONLY);
|
||
|
|
|
||
|
|
let import = NumTraits::new(&ast);
|
||
|
|
|
||
|
|
let impl_ = quote! {
|
||
|
|
impl #import::One for #name {
|
||
|
|
#[inline]
|
||
|
|
fn one() -> Self {
|
||
|
|
#name(<#inner_ty as #import::One>::one())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_one(&self) -> bool {
|
||
|
|
<#inner_ty as #import::One>::is_one(&self.0)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
import.wrap("One", &name, impl_).into()
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Derives [`num_traits::Num`][num] for newtypes. The inner type must already implement `Num`.
|
||
|
|
///
|
||
|
|
/// [num]: https://docs.rs/num-traits/0.2/num_traits/trait.Num.html
|
||
|
|
#[proc_macro_derive(Num, attributes(num_traits))]
|
||
|
|
pub fn num(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
let inner_ty = newtype_inner(&ast.data).expect(NEWTYPE_ONLY);
|
||
|
|
|
||
|
|
let import = NumTraits::new(&ast);
|
||
|
|
|
||
|
|
let impl_ = quote! {
|
||
|
|
impl #import::Num for #name {
|
||
|
|
type FromStrRadixErr = <#inner_ty as #import::Num>::FromStrRadixErr;
|
||
|
|
#[inline]
|
||
|
|
fn from_str_radix(s: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
|
||
|
|
<#inner_ty as #import::Num>::from_str_radix(s, radix).map(#name)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
import.wrap("Num", &name, impl_).into()
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Derives [`num_traits::Float`][float] for newtypes. The inner type must already implement
|
||
|
|
/// `Float`.
|
||
|
|
///
|
||
|
|
/// [float]: https://docs.rs/num-traits/0.2/num_traits/float/trait.Float.html
|
||
|
|
#[proc_macro_derive(Float, attributes(num_traits))]
|
||
|
|
pub fn float(input: TokenStream) -> TokenStream {
|
||
|
|
let ast = parse!(input as syn::DeriveInput);
|
||
|
|
let name = &ast.ident;
|
||
|
|
let inner_ty = newtype_inner(&ast.data).expect(NEWTYPE_ONLY);
|
||
|
|
|
||
|
|
let import = NumTraits::new(&ast);
|
||
|
|
|
||
|
|
let impl_ = quote! {
|
||
|
|
impl #import::Float for #name {
|
||
|
|
#[inline]
|
||
|
|
fn nan() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::nan())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn infinity() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::infinity())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn neg_infinity() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::neg_infinity())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn neg_zero() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::neg_zero())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn min_value() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::min_value())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn min_positive_value() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::min_positive_value())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn max_value() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::max_value())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_nan(self) -> bool {
|
||
|
|
<#inner_ty as #import::Float>::is_nan(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_infinite(self) -> bool {
|
||
|
|
<#inner_ty as #import::Float>::is_infinite(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_finite(self) -> bool {
|
||
|
|
<#inner_ty as #import::Float>::is_finite(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_normal(self) -> bool {
|
||
|
|
<#inner_ty as #import::Float>::is_normal(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn classify(self) -> ::std::num::FpCategory {
|
||
|
|
<#inner_ty as #import::Float>::classify(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn floor(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::floor(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn ceil(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::ceil(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn round(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::round(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn trunc(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::trunc(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn fract(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::fract(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn abs(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::abs(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn signum(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::signum(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_sign_positive(self) -> bool {
|
||
|
|
<#inner_ty as #import::Float>::is_sign_positive(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn is_sign_negative(self) -> bool {
|
||
|
|
<#inner_ty as #import::Float>::is_sign_negative(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn mul_add(self, a: Self, b: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::mul_add(self.0, a.0, b.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn recip(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::recip(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn powi(self, n: i32) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::powi(self.0, n))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn powf(self, n: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::powf(self.0, n.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn sqrt(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::sqrt(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn exp(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::exp(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn exp2(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::exp2(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn ln(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::ln(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn log(self, base: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::log(self.0, base.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn log2(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::log2(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn log10(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::log10(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn max(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::max(self.0, other.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn min(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::min(self.0, other.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn abs_sub(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::abs_sub(self.0, other.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn cbrt(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::cbrt(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn hypot(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::hypot(self.0, other.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn sin(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::sin(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn cos(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::cos(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn tan(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::tan(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn asin(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::asin(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn acos(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::acos(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn atan(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::atan(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn atan2(self, other: Self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::atan2(self.0, other.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn sin_cos(self) -> (Self, Self) {
|
||
|
|
let (x, y) = <#inner_ty as #import::Float>::sin_cos(self.0);
|
||
|
|
(#name(x), #name(y))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn exp_m1(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::exp_m1(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn ln_1p(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::ln_1p(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn sinh(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::sinh(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn cosh(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::cosh(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn tanh(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::tanh(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn asinh(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::asinh(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn acosh(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::acosh(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn atanh(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::atanh(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn integer_decode(self) -> (u64, i16, i8) {
|
||
|
|
<#inner_ty as #import::Float>::integer_decode(self.0)
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn epsilon() -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::epsilon())
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_degrees(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::to_degrees(self.0))
|
||
|
|
}
|
||
|
|
#[inline]
|
||
|
|
fn to_radians(self) -> Self {
|
||
|
|
#name(<#inner_ty as #import::Float>::to_radians(self.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
import.wrap("Float", &name, impl_).into()
|
||
|
|
}
|
||
|
|
|
||
|
|
mod test;
|