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|
use syn::parse::Parse;
use syn::punctuated::Punctuated;
use syn::{Token, Type};
use crate::macro_flag::MacroFlag;
use crate::util::iterator_ext::IteratorExt;
pub const FACTORY_MACRO_FLAGS: &[&str] = &["threadsafe", "async"];
pub struct DeclareDefaultFactoryMacroArgs
{
pub interface: Type,
pub flags: Punctuated<MacroFlag, Token![,]>,
}
impl Parse for DeclareDefaultFactoryMacroArgs
{
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self>
{
let interface = input.parse().unwrap();
if !input.peek(Token![,]) {
return Ok(Self {
interface,
flags: Punctuated::new(),
});
}
input.parse::<Token![,]>().unwrap();
let flags = Punctuated::<MacroFlag, Token![,]>::parse_terminated(input)?;
for flag in &flags {
let flag_str = flag.flag.to_string();
if !FACTORY_MACRO_FLAGS.contains(&flag_str.as_str()) {
return Err(input.error(format!(
"Unknown flag '{}'. Expected one of [ {} ]",
flag_str,
FACTORY_MACRO_FLAGS.join(",")
)));
}
}
let flag_names = flags
.iter()
.map(|flag| flag.flag.to_string())
.collect::<Vec<_>>();
if let Some(dupe_flag_name) = flag_names.iter().find_duplicate() {
return Err(input.error(format!("Duplicate flag '{}'", dupe_flag_name)));
}
Ok(Self { interface, flags })
}
}
|
