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use syn::parse::{Parse, ParseStream, Result};
use syn::punctuated::Punctuated;
use syn::{Path, Token, Type};
use crate::macro_flag::MacroFlag;
use crate::util::iterator_ext::IteratorExt;
pub const DECLARE_INTERFACE_FLAGS: &[&str] = &["async"];
pub struct DeclareInterfaceArgs
{
pub implementation: Type,
pub interface: Path,
pub flags: Punctuated<MacroFlag, Token![,]>,
}
impl Parse for DeclareInterfaceArgs
{
fn parse(input: ParseStream) -> Result<Self>
{
let implementation: Type = input.parse()?;
input.parse::<Token![->]>()?;
let interface: Path = input.parse()?;
let flags = if input.peek(Token![,]) {
input.parse::<Token![,]>()?;
let flags = Punctuated::<MacroFlag, Token![,]>::parse_terminated(input)?;
for flag in &flags {
let flag_str = flag.flag.to_string();
if !DECLARE_INTERFACE_FLAGS.contains(&flag_str.as_str()) {
return Err(input.error(format!(
"Unknown flag '{}'. Expected one of [ {} ]",
flag_str,
DECLARE_INTERFACE_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)));
}
flags
} else {
Punctuated::new()
};
Ok(Self {
implementation,
interface,
flags,
})
}
}
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