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#![crate_type = "proc-macro"]
#![doc(html_root_url = "https://docs.rs/magnet_derive/0.8.0")]
#![deny(missing_debug_implementations, missing_copy_implementations,
trivial_casts, trivial_numeric_casts,
unsafe_code,
unstable_features,
unused_import_braces, unused_qualifications,
)]
#![allow(clippy::single_match, clippy::match_same_arms, clippy::match_ref_pats,
clippy::clone_on_ref_ptr, clippy::needless_pass_by_value)]
#![deny(clippy::wrong_pub_self_convention, clippy::used_underscore_binding,
clippy::stutter, clippy::similar_names, clippy::pub_enum_variant_names,
clippy::missing_docs_in_private_items,
clippy::non_ascii_literal, clippy::unicode_not_nfc,
clippy::result_unwrap_used, clippy::option_unwrap_used,
clippy::option_map_unwrap_or_else, clippy::option_map_unwrap_or, clippy::filter_map,
clippy::shadow_unrelated, clippy::shadow_reuse, clippy::shadow_same,
clippy::int_plus_one, clippy::string_add_assign, clippy::if_not_else,
clippy::invalid_upcast_comparisons,
clippy::cast_precision_loss,
clippy::cast_possible_wrap, clippy::cast_possible_truncation,
clippy::mutex_integer, clippy::mut_mut, clippy::items_after_statements,
clippy::print_stdout, clippy::mem_forget, clippy::maybe_infinite_iter)]
#[macro_use]
extern crate quote;
extern crate syn;
extern crate proc_macro;
extern crate proc_macro2;
mod tag;
mod case;
mod meta;
mod error;
mod generics;
mod codegen_field;
mod codegen_struct;
mod codegen_enum;
mod codegen_union;
use proc_macro::TokenStream;
use syn::{ DeriveInput, Data };
use error::Result;
use generics::GenericsExt;
use codegen_struct::*;
use codegen_enum::*;
use codegen_union::*;
#[proc_macro_derive(BsonSchema, attributes(magnet))]
pub fn derive_bson_schema(input: TokenStream) -> TokenStream {
impl_bson_schema(input).unwrap_or_else(|error| panic!("{}", error))
}
fn impl_bson_schema(input: TokenStream) -> Result<TokenStream> {
let parsed_ast: DeriveInput = syn::parse(input)?;
let ty = parsed_ast.ident;
let impl_ast = match parsed_ast.data {
Data::Struct(s) => impl_bson_schema_struct(parsed_ast.attrs, s)?,
Data::Enum(e) => impl_bson_schema_enum(parsed_ast.attrs, e)?,
Data::Union(u) => impl_bson_schema_union(parsed_ast.attrs, u)?,
};
let generics = parsed_ast.generics;
let (impl_gen, ty_gen, where_cls) = generics.split_and_augment_for_impl();
let generated = quote! {
impl #impl_gen ::magnet_schema::BsonSchema for #ty #ty_gen #where_cls {
fn bson_schema() -> ::bson::Document {
#impl_ast
}
}
};
Ok(generated.into())
}