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macro: verify parameter count

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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2020-01-13 14:21:45 +01:00
parent b9e50338b8
commit e199764961
1 changed files with 12 additions and 1 deletions
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13
perlmod-macro/src/function.rs
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@ -1,6 +1,6 @@
use failure::Error;
use proc_macro2::{Ident, TokenStream};
use proc_macro2::{Ident, TokenStream, Span};
use quote::quote;
@ -94,6 +94,11 @@ pub fn handle_function(attr: FunctionAttrs, func: syn::ItemFn) -> Result<XSub, E
}
}
let too_many_args_error = syn::LitStr::new(
&format!("too many parameters for function '{}', (expected {})", name, sig.inputs.len()),
Span::call_site(),
);
let tokens = quote! {
#func
@ -116,6 +121,12 @@ pub fn handle_function(attr: FunctionAttrs, func: syn::ItemFn) -> Result<XSub, E
#extract_arguments
if args.next().is_some() {
return Err(::perlmod::Value::new_string(#too_many_args_error)
.into_mortal()
.into_raw());
}
drop(args);
#deserialized_arguments