Attribute Macro attribute_macro 

#[attribute_macro]

Macro used to annotate native functions which can be loaded as attribute macros in rune.

See Module::macro_meta.

Examples

use rune::Module;
use rune::ast;
use rune::compile;
use rune::macros::{quote, MacroContext, TokenStream};
use rune::parse::Parser;
use rune::alloc::prelude::*;

/// Takes an identifier and converts it into a string.
///
/// # Examples
///
/// ```rune
/// assert_eq!(ident_to_string!(Hello), "Hello");
/// ```
#[rune::macro_]
fn ident_to_string(cx: &mut MacroContext<'_, '_, '_>, stream: &TokenStream) -> compile::Result<TokenStream> {
    let mut p = Parser::from_token_stream(stream, cx.input_span());
    let ident = p.parse_all::<ast::Ident>()?;
    let ident = cx.resolve(ident)?.try_to_owned()?;
    let string = cx.lit(&ident)?;
    Ok(quote!(#string).into_token_stream(cx)?)
}

let mut m = Module::new();
m.macro_meta(ident_to_string)?;