85 lines
2.0 KiB
Rust
85 lines
2.0 KiB
Rust
use std::num::NonZero;
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use proc_macro::{Group, Ident, Literal, Punct, Span, TokenStream, TokenTree};
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/// Turn a type into a [`TokenStream`].
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pub(crate) trait ToTokenStream: Sized {
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fn append_to(self, ts: &mut TokenStream);
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fn into_token_stream(self) -> TokenStream {
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let mut ts = TokenStream::new();
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self.append_to(&mut ts);
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ts
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}
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}
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pub(crate) trait ToTokenTree: Sized {
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fn into_token_tree(self) -> TokenTree;
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}
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impl<T: ToTokenTree> ToTokenStream for T {
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fn append_to(self, ts: &mut TokenStream) {
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ts.extend([self.into_token_tree()])
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}
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}
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impl ToTokenTree for bool {
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fn into_token_tree(self) -> TokenTree {
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let lit = if self { "true" } else { "false" };
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TokenTree::Ident(Ident::new(lit, Span::mixed_site()))
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}
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}
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impl ToTokenStream for TokenStream {
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fn append_to(self, ts: &mut TokenStream) {
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ts.extend(self)
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}
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}
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impl ToTokenTree for TokenTree {
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fn into_token_tree(self) -> TokenTree {
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self
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}
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}
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impl ToTokenTree for &str {
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fn into_token_tree(self) -> TokenTree {
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TokenTree::Literal(Literal::string(self))
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}
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}
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impl ToTokenTree for NonZero<u16> {
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fn into_token_tree(self) -> TokenTree {
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quote_group! {{
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unsafe { ::core::num::NonZero::<u16>::new_unchecked(#(self.get())) }
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}}
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}
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}
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macro_rules! impl_for_tree_types {
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($($type:ty)*) => {$(
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impl ToTokenTree for $type {
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fn into_token_tree(self) -> TokenTree {
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TokenTree::from(self)
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}
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}
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)*};
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}
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impl_for_tree_types![Ident Literal Group Punct];
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macro_rules! impl_for_int {
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($($type:ty => $method:ident)*) => {$(
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impl ToTokenTree for $type {
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fn into_token_tree(self) -> TokenTree {
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TokenTree::from(Literal::$method(self))
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}
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}
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)*};
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}
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impl_for_int! {
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i8 => i8_unsuffixed
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u8 => u8_unsuffixed
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u16 => u16_unsuffixed
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i32 => i32_unsuffixed
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u32 => u32_unsuffixed
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}
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