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use crate::NameMacro;
use proc_macro2::TokenStream;
pub fn staticize_lifetimes_in_type_path(value: syn::TypePath) -> syn::TypePath {
let mut ty = syn::Type::Path(value);
staticize_lifetimes(&mut ty);
match ty {
syn::Type::Path(type_path) => type_path,
// shouldn't happen
_ => panic!("not a TypePath"),
}
}
pub fn staticize_lifetimes(value: &mut syn::Type) {
match value {
syn::Type::Path(type_path) => {
for segment in &mut type_path.path.segments {
match &mut segment.arguments {
syn::PathArguments::AngleBracketed(bracketed) => {
for arg in &mut bracketed.args {
match arg {
// rename lifetimes to the static lifetime so the TypeIds match.
syn::GenericArgument::Lifetime(lifetime) => {
lifetime.ident =
syn::Ident::new("static", lifetime.ident.span());
}
// recurse
syn::GenericArgument::Type(ty) => staticize_lifetimes(ty),
syn::GenericArgument::Binding(binding) => {
staticize_lifetimes(&mut binding.ty)
}
syn::GenericArgument::Constraint(constraint) => {
for bound in constraint.bounds.iter_mut() {
match bound {
syn::TypeParamBound::Lifetime(lifetime) => {
lifetime.ident =
syn::Ident::new("static", lifetime.ident.span())
}
_ => {}
}
}
}
// nothing to do otherwise
_ => {}
}
}
}
_ => {}
}
}
}
syn::Type::Reference(type_ref) => match &mut type_ref.lifetime {
Some(ref mut lifetime) => {
lifetime.ident = syn::Ident::new("static", lifetime.ident.span());
}
this @ None => *this = Some(syn::parse_quote!('static)),
},
syn::Type::Tuple(type_tuple) => {
for elem in &mut type_tuple.elems {
staticize_lifetimes(elem);
}
}
syn::Type::Macro(type_macro) => {
let mac = &type_macro.mac;
if let Some(archetype) = mac.path.segments.last() {
match archetype.ident.to_string().as_str() {
"name" => {
if let Ok(out) = mac.parse_body::<NameMacro>() {
// We don't particularly care what the identifier is, so we parse a
// raw TokenStream. Specifically, it's okay for the identifier String,
// which we end up using as a Postgres column name, to be nearly any
// string, which can include Rust reserved words such as "type" or "match"
if let Ok(ident) = syn::parse_str::<TokenStream>(&out.ident) {
let mut ty = out.used_ty.resolved_ty;
// rewrite the name!() macro's type so that it has a static lifetime, if any
staticize_lifetimes(&mut ty);
type_macro.mac = syn::parse_quote! {::pgrx::name!(#ident, #ty)};
}
}
}
_ => {}
}
}
}
_ => {}
}
}
pub fn anonymize_lifetimes_in_type_path(value: syn::TypePath) -> syn::TypePath {
let mut ty = syn::Type::Path(value);
anonymize_lifetimes(&mut ty);
match ty {
syn::Type::Path(type_path) => type_path,
// shouldn't happen
_ => panic!("not a TypePath"),
}
}
pub fn anonymize_lifetimes(value: &mut syn::Type) {
match value {
syn::Type::Path(type_path) => {
for segment in &mut type_path.path.segments {
match &mut segment.arguments {
syn::PathArguments::AngleBracketed(bracketed) => {
for arg in &mut bracketed.args {
match arg {
// rename lifetimes to the anonymous lifetime
syn::GenericArgument::Lifetime(lifetime) => {
lifetime.ident = syn::Ident::new("_", lifetime.ident.span());
}
// recurse
syn::GenericArgument::Type(ty) => anonymize_lifetimes(ty),
syn::GenericArgument::Binding(binding) => {
anonymize_lifetimes(&mut binding.ty)
}
syn::GenericArgument::Constraint(constraint) => {
for bound in constraint.bounds.iter_mut() {
match bound {
syn::TypeParamBound::Lifetime(lifetime) => {
lifetime.ident =
syn::Ident::new("_", lifetime.ident.span())
}
_ => {}
}
}
}
// nothing to do otherwise
_ => {}
}
}
}
_ => {}
}
}
}
syn::Type::Reference(type_ref) => {
if let Some(lifetime) = type_ref.lifetime.as_mut() {
lifetime.ident = syn::Ident::new("_", lifetime.ident.span());
}
}
syn::Type::Tuple(type_tuple) => {
for elem in &mut type_tuple.elems {
anonymize_lifetimes(elem);
}
}
_ => {}
}
}