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Support renaming fake crate downstream in Dummy macro #199

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Nov 4, 2024
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Support renaming fake crate downstream in Dummy macro #199

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80 changes: 54 additions & 26 deletions dummy_derive/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,9 @@ extern crate quote;
#[macro_use]
extern crate darling;

use syn::{parse_quote, GenericParam, Generics, Ident, Type};
use core::panic;

use syn::{parse_quote, parse_str, Expr, GenericParam, Generics, Ident, Meta, Path, Type};

use darling::{ast, FromDeriveInput};
use proc_macro::TokenStream;
Expand Down Expand Up @@ -55,10 +57,29 @@ struct Dummy {

#[proc_macro_derive(Dummy, attributes(dummy))]
pub fn derive_dummy(input: TokenStream) -> TokenStream {
let parsed = syn::parse(input).expect("syn::parse ok");
let mut parsed: syn::DeriveInput = syn::parse(input).expect("syn::parse ok");

// Support custom crate name:
let mut crate_name = parse_quote!(::fake);
parsed.attrs.retain(|attr| {
if attr.path().is_ident("dummy") {
if let Ok(Meta::NameValue(meta_name_value)) = attr.parse_args::<Meta>() {
if meta_name_value.path.is_ident("crate_name") {
if let Expr::Lit(lit) = meta_name_value.value {
if let syn::Lit::Str(lit_str) = lit.lit {
crate_name = parse_str(&lit_str.value()).expect("parse_str ok");
return false;
}
}
}
}
}
true
});

let receiver = Dummy::from_derive_input(&parsed).expect("Dummy::from_derive_input ok");

let generics = add_trait_bounds(receiver.generics);
let generics = add_trait_bounds(&crate_name, receiver.generics);
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
let receiver_name = &receiver.ident;
let expanded = match receiver.data {
Expand All @@ -69,20 +90,23 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
}) => match style {
ast::Style::Unit => {
let impl_dummy = quote! {
impl #impl_generics fake::Dummy<fake::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: fake::Rng + ?Sized>(_: &fake::Faker, rng: &mut R) -> Self {
impl #impl_generics #crate_name::Dummy<#crate_name::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: #crate_name::Rng + ?Sized>(_: &#crate_name::Faker, rng: &mut R) -> Self {
#receiver_name
}
}
};
impl_dummy
}
ast::Style::Tuple => {
let tuple_fields: Vec<_> = fields.iter().map(expose_field).collect();
let tuple_fields: Vec<_> = fields
.iter()
.map(|f| expose_field(&crate_name, f))
.collect();

let impl_dummy = quote! {
impl #impl_generics fake::Dummy<fake::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: fake::Rng + ?Sized>(_: &fake::Faker, rng: &mut R) -> Self {
impl #impl_generics #crate_name::Dummy<#crate_name::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: #crate_name::Rng + ?Sized>(_: &#crate_name::Faker, rng: &mut R) -> Self {
#receiver_name(#(#tuple_fields),*)
}
}
Expand All @@ -98,16 +122,16 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
.map(|f| {
let field_name = f.ident.as_ref().unwrap();
let field_ty = &f.ty;
let stream = expose_field(f);
let stream = expose_field(&crate_name, f);
quote! {
let #field_name: #field_ty = #stream;
}
})
.collect();

let impl_dummy = quote! {
impl #impl_generics fake::Dummy<fake::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: fake::Rng + ?Sized>(_: &fake::Faker, rng: &mut R) -> Self {
impl #impl_generics #crate_name::Dummy<#crate_name::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: #crate_name::Rng + ?Sized>(_: &#crate_name::Faker, rng: &mut R) -> Self {
#(#let_statements)*
#receiver_name {
#(#struct_fields),*
Expand Down Expand Up @@ -137,8 +161,12 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
}
}
ast::Style::Tuple => {
let tuple_fields: Vec<_> =
f.fields.fields.iter().map(expose_field).collect();
let tuple_fields: Vec<_> = f
.fields
.fields
.iter()
.map(|f| expose_field(&crate_name, f))
.collect();

quote! {
#i => {
Expand All @@ -161,7 +189,7 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
.map(|f| {
let field_name = f.ident.as_ref().unwrap();
let field_ty = &f.ty;
let stream = expose_field(f);
let stream = expose_field(&crate_name, f);
quote! {
let #field_name: #field_ty = #stream;
}
Expand All @@ -186,10 +214,10 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
}

let impl_dummy = quote! {
impl #impl_generics fake::Dummy<fake::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: fake::Rng + ?Sized>(_: &fake::Faker, rng: &mut R) -> Self {
impl #impl_generics #crate_name::Dummy<#crate_name::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: #crate_name::Rng + ?Sized>(_: &#crate_name::Faker, rng: &mut R) -> Self {
let options = [#(#variant_opts),*];
match fake::rand::seq::SliceRandom::choose(options.as_ref(), rng).unwrap() {
match #crate_name::rand::seq::SliceRandom::choose(options.as_ref(), rng).unwrap() {
#(#match_statements)*
_ => {
unreachable!()
Expand All @@ -202,8 +230,8 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
impl_dummy
} else {
let impl_dummy = quote! {
impl #impl_generics fake::Dummy<fake::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: fake::Rng + ?Sized>(_: &fake::Faker, rng: &mut R) -> Self {
impl #impl_generics #crate_name::Dummy<#crate_name::Faker> for #receiver_name #ty_generics #where_clause {
fn dummy_with_rng<R: #crate_name::Rng + ?Sized>(_: &#crate_name::Faker, rng: &mut R) -> Self {
panic!("can not create an empty enum")
}
}
Expand All @@ -216,7 +244,7 @@ pub fn derive_dummy(input: TokenStream) -> TokenStream {
expanded.into()
}

fn expose_field(f: &DummyField) -> proc_macro2::TokenStream {
fn expose_field(crate_name: &Path, f: &DummyField) -> proc_macro2::TokenStream {
if f.default {
quote! {
Default::default()
Expand All @@ -234,32 +262,32 @@ fn expose_field(f: &DummyField) -> proc_macro2::TokenStream {
if let Some(ref from) = f.from {
let from_ty = syn::parse_str::<syn::Type>(from).unwrap();
quote! {
::std::convert::Into::<#field_ty>::into(fake::Fake::fake_with_rng::<#from_ty, _>(&(#faker), rng))
::std::convert::Into::<#field_ty>::into(#crate_name::Fake::fake_with_rng::<#from_ty, _>(&(#faker), rng))
}
} else if let Some(ref wrapper) = f.wrapper {
let wrapper_ty = syn::parse_str::<syn::Type>(wrapper).unwrap();
quote! {
fake::utils::IntoInner::into_inner(fake::Fake::fake_with_rng::<#wrapper_ty<#field_ty>, _>(&(#faker), rng))
#crate_name::utils::IntoInner::into_inner(#crate_name::Fake::fake_with_rng::<#wrapper_ty<#field_ty>, _>(&(#faker), rng))
}
} else {
quote! {
fake::Fake::fake_with_rng::<#field_ty, _>(&(#faker), rng)
#crate_name::Fake::fake_with_rng::<#field_ty, _>(&(#faker), rng)
}
}
} else {
quote! {
fake::Fake::fake_with_rng::<#field_ty, _>(&fake::Faker, rng)
#crate_name::Fake::fake_with_rng::<#field_ty, _>(&#crate_name::Faker, rng)
}
}
}
}

fn add_trait_bounds(mut generics: Generics) -> Generics {
fn add_trait_bounds(crate_name: &Path, mut generics: Generics) -> Generics {
for param in &mut generics.params {
if let GenericParam::Type(ref mut type_param) = *param {
type_param
.bounds
.push(parse_quote!(fake::Dummy<fake::Faker>));
.push(parse_quote!(#crate_name::Dummy<#crate_name::Faker>));
}
}
generics
Expand Down
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