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use convert_case::Casing;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, Data, DataEnum, DeriveInput, Ident};
use crate::write_file;
pub fn sub_partition_impl(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let ident = input.ident.clone();
let out = match &input.data {
Data::Enum(ds) => generate_enum_impl(ident.clone(), ds),
_ => {
return syn::Error::new_spanned(input, "#[derive(SubPartition)] only supports enum")
.to_compile_error()
.into();
}
};
// record default/consts
write_file::write_file(ident.to_string(), "sub_partition", out.to_string());
out.into()
}
fn generate_enum_impl(ident: Ident, ds: &DataEnum) -> proc_macro2::TokenStream {
let mut struct_defs = Vec::new();
for variant in &ds.variants {
let variant_name = &variant.ident;
// Only process variants with exactly one String field
if let syn::Fields::Unit = &variant.fields {
let struct_name =
syn::Ident::new(&format!("{}{}", variant_name, ident), variant_name.span());
let prefix = syn::LitStr::new(
&format!(
"{}",
variant_name
.to_string()
.to_case(convert_case::Case::UpperSnake)
),
variant_name.span(),
);
let struct_def = quote! {
#[derive(
Debug,
Clone,
serde_with::SerializeDisplay,
serde_with::DeserializeFromStr,
Default,
schemars::JsonSchema,
PartialEq,
Eq,
aide::OperationIo,
)]
pub struct #struct_name;
impl std::fmt::Display for #struct_name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", #prefix)
}
}
impl std::str::FromStr for #struct_name {
type Err = crate::Error;
fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
if s == #prefix {
Ok(#struct_name)
} else {
Err(Self::Err::InvalidPartitionKey(format!("{} must be {}", stringify!(#struct_name), #prefix)))
}
}
}
impl Into<#ident> for #struct_name {
fn into(self) -> #ident {
#ident::#variant_name
}
}
impl From<#ident> for #struct_name {
fn from(partition: #ident) -> Self {
match partition {
#ident::#variant_name => Self,
_ => Self,
}
}
}
impl From<String> for #struct_name {
fn from(s: String) -> Self {
if &s == #prefix {
#struct_name
} else {
panic!("{}", format!("{} must be {}", stringify!(#struct_name), #prefix))
}
}
}
};
struct_defs.push(struct_def);
} else if let syn::Fields::Unnamed(fields) = &variant.fields {
if fields.unnamed.len() == 1 {
let struct_name =
syn::Ident::new(&format!("{}{}", variant_name, ident), variant_name.span());
let prefix = syn::LitStr::new(
&format!(
"{}#",
variant_name
.to_string()
.to_case(convert_case::Case::UpperSnake)
),
variant_name.span(),
);
let struct_def = quote! {
#[derive(
Debug,
Clone,
serde_with::SerializeDisplay,
serde_with::DeserializeFromStr,
Default,
schemars::JsonSchema,
PartialEq,
Eq,
aide::OperationIo,
)]
pub struct #struct_name(pub String);
impl std::fmt::Display for #struct_name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
impl std::str::FromStr for #struct_name {
type Err = crate::Error;
fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
let s = if s.starts_with(#prefix) {
s.replace(#prefix, "").to_string()
} else {
s.to_string()
};
Ok(#struct_name(s))
}
}
impl Into<#ident> for #struct_name {
fn into(self) -> #ident {
#ident::#variant_name(self.0)
}
}
impl From<#ident> for #struct_name {
fn from(partition: #ident) -> Self {
match partition {
#ident::#variant_name(id) => Self(id),
_ => Self("".to_string()),
}
}
}
impl From<String> for #struct_name {
fn from(s: String) -> Self {
let s = if s.starts_with(#prefix) {
s.replace(#prefix, "").to_string()
} else {
s.to_string()
};
#struct_name(s)
}
}
};
struct_defs.push(struct_def);
}
}
}
quote! {
#(#struct_defs)*
}
}