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use proc_macro2::Span;
use syn::Attribute;
use syn::{parse, spanned::Spanned, ItemType, Visibility};
use crate::syntax::parse::util::FilterAttrs;
use crate::syntax::{
ast::{Monotonic, MonotonicArgs},
parse::util,
};
impl MonotonicArgs {
pub(crate) fn parse(attr: Attribute) -> parse::Result<Self> {
crate::syntax::parse::monotonic_args(attr.path, attr.tokens)
}
}
impl Monotonic {
pub(crate) fn parse(args: MonotonicArgs, item: &ItemType, span: Span) -> parse::Result<Self> {
if item.vis != Visibility::Inherited {
return Err(parse::Error::new(
span,
"this field must have inherited / private visibility",
));
}
let FilterAttrs { cfgs, attrs, .. } = util::filter_attributes(item.attrs.clone());
if !attrs.is_empty() {
return Err(parse::Error::new(
attrs[0].path.span(),
"Monotonic does not support attributes other than `#[cfg]`",
));
}
Ok(Monotonic {
cfgs,
ident: item.ident.clone(),
ty: item.ty.clone(),
args,
})
}
}
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