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use proc_macro2::Span;
use syn::{
Meta, Token,
parse::{Parse, ParseStream},
spanned::Spanned,
};
/// Arguments to the `#[turbo_tasks::value_trait]` attribute macro.
#[derive(Debug)]
pub struct ValueTraitArguments {
/// Whether the macro should generate a `ValueDebug`-like `dbg()`
/// implementation on the trait's `Vc`.
pub debug: bool,
/// Should the trait have a `turbo_tasks::OperationValue` supertype?
pub operation: Option<Span>,
}
impl Default for ValueTraitArguments {
fn default() -> Self {
Self {
debug: true,
operation: None,
}
}
}
impl Parse for ValueTraitArguments {
fn parse(input: ParseStream) -> syn::Result<Self> {
let mut result = Self::default();
if input.is_empty() {
return Ok(result);
}
let punctuated = input.parse_terminated(Meta::parse, Token![,])?;
for meta in punctuated {
match meta.path().get_ident().map(ToString::to_string).as_deref() {
Some("no_debug") => {
result.debug = false;
}
Some("operation") => {
result.operation = Some(meta.span());
}
_ => {
return Err(syn::Error::new_spanned(meta, "unknown parameter"));
}
}
}
Ok(result)
}
}
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