token-goblin 0.1.0

Inline procedural macros without a separate proc-macro crate.
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// Force throwing error only with span.
#[allow(unused)]
macro_rules! bail {
    ($($err:tt)*) => {
        return Err(error!($($err)*))
    };

}

macro_rules! error {
    ($span:expr => $($message:tt)*) => {
        syn::Error::new( $span, format!($($message)*))
    };
    ($($message:tt)*) => {
        syn::Error::new(proc_macro2::Span::call_site(), format!($($message)*))
    };
}

pub trait MapCompileError {
    fn map_compile_error(self) -> proc_macro2::TokenStream;
}

impl MapCompileError for super::Result<proc_macro2::TokenStream> {
    fn map_compile_error(self) -> proc_macro2::TokenStream {
        self.unwrap_or_else(|e| e.to_compile_error())
    }
}

macro_rules! debug {
    ($($message:tt)*) => {
        if crate::DEBUG {
            let fmt = format_args!($($message)*);
            eprintln!("[{module}] {fmt}", module = module_path!());
        }
    };
}