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|
use syn::parse::Parse;
use syn::punctuated::Punctuated;
use syn::Token;
use crate::macro_flag::MacroFlag;
use crate::util::iterator_ext::IteratorExt;
pub const FACTORY_MACRO_FLAGS: &[&str] = &["threadsafe", "async"];
pub struct FactoryMacroArgs
{
pub flags: Punctuated<MacroFlag, Token![,]>,
}
impl Parse for FactoryMacroArgs
{
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self>
{
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 { flags })
}
}
#[cfg(test)]
mod tests
{
use std::error::Error;
use proc_macro2::Span;
use quote::{format_ident, quote};
use syn::{parse2, LitBool};
use super::*;
#[test]
fn can_parse_with_single_flag() -> Result<(), Box<dyn Error>>
{
let input_args = quote! {
async = true
};
let factory_macro_args = parse2::<FactoryMacroArgs>(input_args)?;
assert_eq!(
factory_macro_args.flags,
Punctuated::from_iter(vec![MacroFlag {
flag: format_ident!("async"),
is_on: LitBool::new(true, Span::call_site())
}])
);
Ok(())
}
#[test]
fn can_parse_with_multiple_flags() -> Result<(), Box<dyn Error>>
{
let input_args = quote! {
async = true, threadsafe = false
};
let factory_macro_args = parse2::<FactoryMacroArgs>(input_args)?;
assert_eq!(
factory_macro_args.flags,
Punctuated::from_iter(vec![
MacroFlag {
flag: format_ident!("async"),
is_on: LitBool::new(true, Span::call_site())
},
MacroFlag {
flag: format_ident!("threadsafe"),
is_on: LitBool::new(false, Span::call_site())
}
])
);
Ok(())
}
#[test]
fn cannot_parse_with_invalid_flag()
{
let input_args = quote! {
async = true, threadsafe = false, foo = true
};
assert!(parse2::<FactoryMacroArgs>(input_args).is_err());
}
#[test]
fn cannot_parse_with_duplicate_flag()
{
assert!(
// Formatting is weird without this comment
parse2::<FactoryMacroArgs>(quote! {
async = true, threadsafe = false, async = true
})
.is_err()
);
assert!(
// Formatting is weird without this comment
parse2::<FactoryMacroArgs>(quote! {
async = true, threadsafe = false, async = false
})
.is_err()
);
}
}
|
