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use just_fmt::snake_case;
use proc_macro::TokenStream;
use quote::quote;
use syn::{Ident, Token, Type, parse_macro_input};
enum PackErrInput {
/// pack_err!(ErrorNotFound)
Simple { type_name: Ident },
/// pack_err!(ErrorNotDir = PathBuf)
Typed {
type_name: Ident,
inner_type: Box<Type>,
},
}
impl syn::parse::Parse for PackErrInput {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let type_name: Ident = input.parse()?;
if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
let inner_type: Type = input.parse()?;
Ok(PackErrInput::Typed {
type_name,
inner_type: Box::new(inner_type),
})
} else {
Ok(PackErrInput::Simple { type_name })
}
}
}
#[allow(clippy::too_many_lines)]
pub(crate) fn pack_err(input: TokenStream) -> TokenStream {
let parsed = parse_macro_input!(input as PackErrInput);
match parsed {
PackErrInput::Simple { type_name } => {
let name_str = type_name.to_string();
let snake_name = snake_case!(&name_str);
// Note: No longer derives Serialize under structural_renderer.
// Use pack_err_structural for structured output support.
let derive = quote! {
#[derive(::mingling::Grouped)]
};
let expanded = quote! {
#derive
pub struct #type_name {
/// The snake_case name of this error, automatically set at compile time.
pub name: String,
}
impl ::std::default::Default for #type_name {
fn default() -> Self {
Self {
name: #snake_name.into(),
}
}
}
::mingling::macros::register_type!(#type_name);
};
expanded.into()
}
PackErrInput::Typed {
type_name,
inner_type,
} => {
let name_str = type_name.to_string();
let snake_name = snake_case!(&name_str);
// Note: No longer derives Serialize under structural_renderer.
// Use pack_err_structural for structured output support.
let derive = quote! {
#[derive(::mingling::Grouped)]
};
let expanded = quote! {
#derive
pub struct #type_name {
/// The snake_case name of this error, automatically set at compile time.
pub name: String,
/// Additional context info for this error.
pub info: #inner_type,
}
impl #type_name {
/// Creates a new error with the given info.
/// The `name` field is automatically set to the snake_case of the struct name.
pub fn new(info: #inner_type) -> Self {
Self {
name: #snake_name.into(),
info,
}
}
}
::mingling::macros::register_type!(#type_name);
};
expanded.into()
}
}
}
|
