ast_node/lib.rs
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#![deny(clippy::all)]
#![recursion_limit = "1024"]
extern crate proc_macro;
use quote::quote;
use swc_macros_common::prelude::*;
use syn::{visit_mut::VisitMut, *};
mod ast_node_macro;
mod enum_deserialize;
mod spanned;
/// Derives [`swc_common::Spanned`]. See [`swc_common::Spanned`] for
/// documentation.
#[proc_macro_derive(Spanned, attributes(span))]
pub fn derive_spanned(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = parse::<DeriveInput>(input).expect("failed to parse input as DeriveInput");
let item = self::spanned::derive(input);
print("derive(Spanned)", item.into_token_stream())
}
/// Derives `serde::Deserialize` which is aware of `tag` based deserialization.
#[proc_macro_derive(DeserializeEnum, attributes(tag))]
pub fn derive_deserialize_enum(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = parse::<DeriveInput>(input).expect("failed to parse input as DeriveInput");
let item = enum_deserialize::expand(input);
print("derive(DeserializeEnum)", item.into_token_stream())
}
/// Derives `serde::Serialize` and `serde::Deserialize`.
///
/// # Struct attributes
///
/// `#[ast_serde("A")]` adds `"type": "A"` to json when serialized, and
/// deserializes as the type only if `type` field of json string is `A`.
///
/// # Enum attributes
///
/// ## Type-level attributes
///
/// This macro does not accept arguments if used on enum.
///
/// ## Variant attributes
///
/// ### `#[tag("Expr")]`
///
/// You can tell "Use this variant if `type` is `Expr`".
///
/// This attribute can be applied multiple time, if a variant consumes multiple
/// `type`s.
///
/// For example, `Lit` of swc_ecma_ast is an enum, but `Expr`, which contains
/// `Lit` as a variant, is also an enum.
/// So the `Lit` variant has multiple `#[tag]`-s like
///
/// ```rust,ignore
/// enum Expr {
/// #[tag("StringLiteral")]
/// #[tag("NumericLiteral")]
/// #[tag("BooleanLiteral")]
/// Lit(Lit),
/// }
/// ```
///
/// so the deserializer can decide which variant to use.
///
///
/// `#[tag]` also supports wildcard like `#[tag("*")]`. You can use this if
/// there are two many variants.
#[proc_macro_attribute]
pub fn ast_serde(
args: proc_macro::TokenStream,
input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
let input: DeriveInput = parse(input).expect("failed to parse input as a DeriveInput");
// we should use call_site
let mut item = TokenStream::new();
match input.data {
Data::Enum(..) => {
if !args.is_empty() {
panic!("#[ast_serde] on enum does not accept any argument")
}
item.extend(quote!(
#[derive(::serde::Serialize, ::swc_common::DeserializeEnum)]
#[serde(untagged)]
#input
));
}
_ => {
let args: Option<ast_node_macro::Args> = if args.is_empty() {
None
} else {
Some(parse(args).expect("failed to parse args of #[ast_serde]"))
};
let serde_tag = match input.data {
Data::Struct(DataStruct {
fields: Fields::Named(..),
..
}) => {
if args.is_some() {
Some(quote!(#[serde(tag = "type")]))
} else {
None
}
}
_ => None,
};
let serde_rename = args.as_ref().map(|args| {
let name = &args.ty;
quote!(#[serde(rename = #name)])
});
item.extend(quote!(
#[derive(::serde::Serialize, ::serde::Deserialize)]
#serde_tag
#[serde(rename_all = "camelCase")]
#serde_rename
#input
));
}
};
print("ast_serde", item)
}
struct AddAttr;
impl VisitMut for AddAttr {
fn visit_field_mut(&mut self, f: &mut Field) {
f.attrs
.push(parse_quote!(#[cfg_attr(feature = "__rkyv", rkyv(omit_bounds))]));
}
}
/// Alias for
/// `#[derive(Spanned, Fold, Clone, Debug, PartialEq)]` for a struct and
/// `#[derive(Spanned, Fold, Clone, Debug, PartialEq, FromVariant)]` for an
/// enum.
#[proc_macro_attribute]
pub fn ast_node(
args: proc_macro::TokenStream,
input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
let mut input: DeriveInput = parse(input).expect("failed to parse input as a DeriveInput");
AddAttr.visit_data_mut(&mut input.data);
// we should use call_site
let mut item = TokenStream::new();
match input.data {
Data::Enum(..) => {
struct EnumArgs {
clone: bool,
}
impl parse::Parse for EnumArgs {
fn parse(i: parse::ParseStream<'_>) -> syn::Result<Self> {
let name: Ident = i.parse()?;
if name != "no_clone" {
return Err(i.error("unknown attribute"));
}
Ok(EnumArgs { clone: false })
}
}
let args = if args.is_empty() {
EnumArgs { clone: true }
} else {
parse(args).expect("failed to parse args of #[ast_node]")
};
let clone = if args.clone {
Some(quote!(#[derive(Clone)]))
} else {
None
};
item.extend(quote!(
#[allow(clippy::derive_partial_eq_without_eq)]
#[cfg_attr(
feature = "serde-impl",
derive(
::serde::Serialize,
)
)]
#[derive(
::swc_common::FromVariant,
::swc_common::Spanned,
Debug,
PartialEq,
::swc_common::DeserializeEnum,
)]
#clone
#[cfg_attr(
feature = "rkyv-impl",
derive(rkyv::Archive, rkyv::Serialize, rkyv::Deserialize)
)]
#[cfg_attr(
feature = "rkyv-impl",
rkyv(deserialize_bounds(__D::Error: rkyv::rancor::Source))
)]
#[cfg_attr(feature = "rkyv-impl", repr(u32))]
#[cfg_attr(
feature = "rkyv-impl",
rkyv(serialize_bounds(__S: rkyv::ser::Writer + rkyv::ser::Allocator,
__S::Error: rkyv::rancor::Source))
)]
#[cfg_attr(
feature = "rkyv-impl",
rkyv(bytecheck(bounds(
__C: rkyv::validation::ArchiveContext,
__C::Error: rkyv::rancor::Source
)))
)]
#[cfg_attr(
feature = "serde-impl",
serde(untagged)
)]
#input
));
}
_ => {
let args: Option<ast_node_macro::Args> = if args.is_empty() {
None
} else {
Some(parse(args).expect("failed to parse args of #[ast_node]"))
};
let serde_tag = match input.data {
Data::Struct(DataStruct {
fields: Fields::Named(..),
..
}) => {
if args.is_some() {
Some(quote!(#[cfg_attr(
feature = "serde-impl",
serde(tag = "type")
)]))
} else {
None
}
}
_ => None,
};
let serde_rename = args.as_ref().map(|args| {
let name = &args.ty;
quote!(#[cfg_attr(
feature = "serde-impl",
serde(rename = #name)
)])
});
let ast_node_impl = args
.as_ref()
.map(|args| ast_node_macro::expand_struct(args.clone(), input.clone()));
item.extend(quote!(
#[allow(clippy::derive_partial_eq_without_eq)]
#[derive(::swc_common::Spanned, Clone, Debug, PartialEq)]
#[cfg_attr(
feature = "serde-impl",
derive(::serde::Serialize, ::serde::Deserialize)
)]
#[cfg_attr(
feature = "rkyv-impl",
derive(rkyv::Archive, rkyv::Serialize, rkyv::Deserialize)
)]
#[cfg_attr(
feature = "rkyv-impl",
rkyv(deserialize_bounds(__D::Error: rkyv::rancor::Source))
)]
#[cfg_attr(
feature = "rkyv-impl",
rkyv(bytecheck(bounds(
__C: rkyv::validation::ArchiveContext,
__C::Error: rkyv::rancor::Source
)))
)]
#[cfg_attr(feature = "rkyv-impl", repr(C))]
#[cfg_attr(
feature = "rkyv-impl",
rkyv(serialize_bounds(__S: rkyv::ser::Writer + rkyv::ser::Allocator,
__S::Error: rkyv::rancor::Source))
)]
#serde_tag
#[cfg_attr(
feature = "serde-impl",
serde(rename_all = "camelCase")
)]
#serde_rename
#input
));
if let Some(items) = ast_node_impl {
for item_impl in items {
item.extend(item_impl.into_token_stream());
}
}
}
};
print("ast_node", item)
}