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pub mod entity;
use crate::sql_entity_graph::ToSqlConfig;
use proc_macro2::{Span, TokenStream as TokenStream2};
use quote::{quote, ToTokens, TokenStreamExt};
use syn::{
parse::{Parse, ParseStream},
DeriveInput, Generics, ItemEnum,
};
use syn::{punctuated::Punctuated, Ident, Token};
#[derive(Debug, Clone)]
pub struct PostgresEnum {
name: Ident,
generics: Generics,
variants: Punctuated<syn::Variant, Token![,]>,
to_sql_config: ToSqlConfig,
}
impl PostgresEnum {
pub fn new(
name: Ident,
generics: Generics,
variants: Punctuated<syn::Variant, Token![,]>,
to_sql_config: ToSqlConfig,
) -> Self {
Self {
name,
generics,
variants,
to_sql_config,
}
}
pub fn from_derive_input(derive_input: DeriveInput) -> Result<Self, syn::Error> {
let to_sql_config =
ToSqlConfig::from_attributes(derive_input.attrs.as_slice())?.unwrap_or_default();
let data_enum = match derive_input.data {
syn::Data::Enum(data_enum) => data_enum,
syn::Data::Union(_) | syn::Data::Struct(_) => {
return Err(syn::Error::new(derive_input.ident.span(), "expected enum"))
}
};
Ok(Self::new(
derive_input.ident,
derive_input.generics,
data_enum.variants,
to_sql_config,
))
}
}
impl Parse for PostgresEnum {
fn parse(input: ParseStream) -> Result<Self, syn::Error> {
let parsed: ItemEnum = input.parse()?;
let to_sql_config =
ToSqlConfig::from_attributes(parsed.attrs.as_slice())?.unwrap_or_default();
Ok(Self::new(
parsed.ident,
parsed.generics,
parsed.variants,
to_sql_config,
))
}
}
impl ToTokens for PostgresEnum {
fn to_tokens(&self, tokens: &mut TokenStream2) {
let name = self.name.clone();
let mut static_generics = self.generics.clone();
for lifetime in static_generics.lifetimes_mut() {
lifetime.lifetime.ident = Ident::new("static", Span::call_site());
}
let (_impl_generics, ty_generics, _where_clauses) = static_generics.split_for_impl();
let variants = self.variants.iter();
let sql_graph_entity_fn_name =
syn::Ident::new(&format!("__pgx_internals_enum_{}", name), Span::call_site());
let to_sql_config = &self.to_sql_config;
let inv = quote! {
#[no_mangle]
#[doc(hidden)]
pub extern "C" fn #sql_graph_entity_fn_name() -> ::pgx::utils::sql_entity_graph::SqlGraphEntity {
extern crate alloc;
use alloc::vec::Vec;
use alloc::vec;
let mut mappings = Default::default();
<#name #ty_generics as ::pgx::datum::WithTypeIds>::register_with_refs(&mut mappings, stringify!(#name).to_string());
::pgx::datum::WithSizedTypeIds::<#name #ty_generics>::register_sized_with_refs(&mut mappings, stringify!(#name).to_string());
::pgx::datum::WithArrayTypeIds::<#name #ty_generics>::register_array_with_refs(&mut mappings, stringify!(#name).to_string());
::pgx::datum::WithVarlenaTypeIds::<#name #ty_generics>::register_varlena_with_refs(&mut mappings, stringify!(#name).to_string());
let submission = ::pgx::utils::sql_entity_graph::PostgresEnumEntity {
name: stringify!(#name),
file: file!(),
line: line!(),
module_path: module_path!(),
full_path: core::any::type_name::<#name #ty_generics>(),
mappings,
variants: vec![ #( stringify!(#variants) ),* ],
to_sql_config: #to_sql_config,
};
::pgx::utils::sql_entity_graph::SqlGraphEntity::Enum(submission)
}
};
tokens.append_all(inv);
}
}