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