mirror of https://github.com/rust-lang/rust
91 lines
2.3 KiB
Rust
91 lines
2.3 KiB
Rust
//@ force-host
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//@ no-prefer-dynamic
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
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#[proc_macro]
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pub fn expand(_: TokenStream) -> TokenStream {
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// Hand expansion/rewriting of
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// ```
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// quote! {
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// output_mut(|o| o.copied_text = "".into());
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// output_mut(|o| o.copied_text = format!("{:?}", self.tile_db));
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// }.into()
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// ```
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stream([
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ident("output_mut"),
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group(
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Delimiter::Parenthesis,
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[
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or(),
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ident("o"),
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or(),
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ident("o"),
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dot(),
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ident("copied_text"),
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eq(),
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string(""),
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dot(),
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ident("into"),
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group(Delimiter::Parenthesis, []),
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],
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),
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semi(),
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ident("output_mut"),
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group(
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Delimiter::Parenthesis,
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[
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or(),
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ident("o"),
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or(),
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ident("o"),
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dot(),
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ident("copied_text"),
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eq(),
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ident("format"),
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bang(),
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group(
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Delimiter::Parenthesis,
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[string("{:?}"), comma(), ident("self"), dot(), ident("tile_db")],
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),
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],
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),
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semi(),
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])
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}
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fn stream(s: impl IntoIterator<Item = TokenTree>) -> TokenStream {
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s.into_iter().collect()
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}
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fn ident(i: &str) -> TokenTree {
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TokenTree::Ident(Ident::new(i, Span::call_site()))
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}
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fn group(d: Delimiter, s: impl IntoIterator<Item = TokenTree>) -> TokenTree {
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TokenTree::Group(Group::new(d, s.into_iter().collect()))
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}
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fn semi() -> TokenTree {
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TokenTree::Punct(Punct::new(';', Spacing::Alone))
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}
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fn or() -> TokenTree {
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TokenTree::Punct(Punct::new('|', Spacing::Alone))
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}
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fn dot() -> TokenTree {
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TokenTree::Punct(Punct::new('.', Spacing::Alone))
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}
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fn eq() -> TokenTree {
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TokenTree::Punct(Punct::new('=', Spacing::Alone))
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}
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fn bang() -> TokenTree {
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TokenTree::Punct(Punct::new('!', Spacing::Alone))
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}
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fn comma() -> TokenTree {
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TokenTree::Punct(Punct::new(',', Spacing::Alone))
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}
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fn string(s: &str) -> TokenTree {
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TokenTree::Literal(Literal::string(s))
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}
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