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use syn::parse::{Parse, ParseStream};
use syn::punctuated::Punctuated;
use syn::{Token, TypePath};
use crate::macro_flag::MacroFlag;
use crate::util::iterator_ext::IteratorExt;
pub const INJECTABLE_MACRO_FLAGS: &[&str] =
&["no_doc_hidden", "async", "no_declare_concrete_interface"];
pub struct InjectableMacroArgs
{
pub interface: Option<TypePath>,
pub flags: Punctuated<MacroFlag, Token![,]>,
}
impl Parse for InjectableMacroArgs
{
fn parse(input: ParseStream) -> syn::Result<Self>
{
let input_fork = input.fork();
let mut interface = None;
if input_fork.parse::<MacroFlag>().is_err() {
// Input doesn't begin with flags
interface = input.parse::<TypePath>().ok();
if interface.is_some() {
let comma_input_lookahead = input.lookahead1();
if !comma_input_lookahead.peek(Token![,]) {
return Ok(Self {
interface,
flags: Punctuated::new(),
});
}
input.parse::<Token![,]>()?;
}
if input.is_empty() {
return Ok(Self {
interface,
flags: Punctuated::new(),
});
}
}
let flags = Punctuated::<MacroFlag, Token![,]>::parse_terminated(input)?;
for flag in &flags {
let flag_str = flag.flag.to_string();
if !INJECTABLE_MACRO_FLAGS.contains(&flag_str.as_str()) {
return Err(input.error(format!(
"Unknown flag '{}'. Expected one of [ {} ]",
flag_str,
INJECTABLE_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 })
}
}
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