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use quote::{format_ident, quote, ToTokens};
use syn::{Data, DeriveInput, Fields, Meta, Type};
use super::models::{FieldAttributeBuilder, FieldName, TypeAttributeBuilder, TypeName};
use crate::{common::path::path_to_string, supported_traits::Trait, trait_handlers::TraitHandler};
pub(crate) struct DebugEnumHandler;
impl TraitHandler for DebugEnumHandler {
fn trait_meta_handler(
ast: &DeriveInput,
token_stream: &mut proc_macro2::TokenStream,
traits: &[Trait],
meta: &Meta,
) -> syn::Result<()> {
let type_attribute = TypeAttributeBuilder {
enable_flag: true,
enable_unsafe: false,
enable_name: true,
enable_named_field: false,
enable_bound: true,
name: TypeName::Disable,
named_field: false,
}
.build_from_debug_meta(meta)?;
let name = type_attribute.name.to_ident_by_ident(&ast.ident);
let mut debug_types: Vec<&Type> = Vec::new();
let mut builder_token_stream = proc_macro2::TokenStream::new();
let mut arms_token_stream = proc_macro2::TokenStream::new();
if let Data::Enum(data) = &ast.data {
for variant in data.variants.iter() {
let type_attribute = TypeAttributeBuilder {
enable_flag: false,
enable_unsafe: false,
enable_name: true,
enable_named_field: true,
enable_bound: false,
name: TypeName::Default,
named_field: matches!(&variant.fields, Fields::Named(_)),
}
.build_from_attributes(&variant.attrs, traits)?;
let variant_ident = &variant.ident;
let variant_name = type_attribute.name.to_ident_by_ident(variant_ident);
let named_field = type_attribute.named_field;
let name_string = if let Some(name) = name {
if let Some(variant_name) = variant_name {
Some(path_to_string(&syn::parse2(quote!(#name::#variant_name)).unwrap()))
} else {
Some(name.into_token_stream().to_string())
}
} else {
variant_name.map(|variant_name| variant_name.into_token_stream().to_string())
};
match &variant.fields {
Fields::Unit => {
if name_string.is_none() {
return Err(super::panic::unit_variant_need_name(variant));
}
arms_token_stream
.extend(quote!( Self::#variant_ident => f.write_str(#name_string), ));
},
Fields::Named(fields) => {
let mut has_fields = false;
let mut pattern_token_stream = proc_macro2::TokenStream::new();
let mut block_token_stream = proc_macro2::TokenStream::new();
if named_field {
block_token_stream
.extend(create_named_field_builder(name_string.as_deref()));
for field in fields.named.iter() {
let field_attribute = FieldAttributeBuilder {
enable_name: true,
enable_ignore: true,
enable_method: true,
name: FieldName::Default,
}
.build_from_attributes(&field.attrs, traits)?;
let field_name_real = field.ident.as_ref().unwrap();
let field_name_var = format_ident!("_{}", field_name_real);
if field_attribute.ignore {
pattern_token_stream.extend(quote!(#field_name_real: _,));
continue;
}
let key = match field_attribute.name {
FieldName::Custom(name) => name,
FieldName::Default => field_name_real.clone(),
};
pattern_token_stream
.extend(quote!(#field_name_real: #field_name_var,));
let ty = &field.ty;
if let Some(method) = field_attribute.method {
block_token_stream.extend(super::common::create_format_arg(
ast,
ty,
&method,
quote!(#field_name_var),
));
block_token_stream.extend(if name_string.is_some() {
quote! (builder.field(stringify!(#key), &arg);)
} else {
quote! (builder.entry(&Educe__RawString(stringify!(#key)), &arg);)
});
} else {
debug_types.push(ty);
block_token_stream.extend(if name_string.is_some() {
quote! (builder.field(stringify!(#key), #field_name_var);)
} else {
quote! (builder.entry(&Educe__RawString(stringify!(#key)), #field_name_var);)
});
}
has_fields = true;
}
} else {
block_token_stream
.extend(quote!(let mut builder = f.debug_tuple(#name_string);));
for field in fields.named.iter() {
let field_attribute = FieldAttributeBuilder {
enable_name: false,
enable_ignore: true,
enable_method: true,
name: FieldName::Default,
}
.build_from_attributes(&field.attrs, traits)?;
let field_name_real = field.ident.as_ref().unwrap();
let field_name_var = format_ident!("_{}", field_name_real);
if field_attribute.ignore {
pattern_token_stream.extend(quote!(#field_name_real: _,));
continue;
}
pattern_token_stream
.extend(quote!(#field_name_real: #field_name_var,));
let ty = &field.ty;
if let Some(method) = field_attribute.method {
block_token_stream.extend(super::common::create_format_arg(
ast,
ty,
&method,
quote!(#field_name_var),
));
block_token_stream.extend(quote! (builder.field(&arg);));
} else {
debug_types.push(ty);
block_token_stream
.extend(quote! (builder.field(#field_name_var);));
}
has_fields = true;
}
}
if !has_fields && name_string.is_none() {
return Err(super::panic::unit_struct_need_name(variant_ident));
}
arms_token_stream.extend(quote! {
Self::#variant_ident { #pattern_token_stream } => {
#block_token_stream
builder.finish()
},
});
},
Fields::Unnamed(fields) => {
let mut has_fields = false;
let mut pattern_token_stream = proc_macro2::TokenStream::new();
let mut block_token_stream = proc_macro2::TokenStream::new();
if named_field {
block_token_stream
.extend(create_named_field_builder(name_string.as_deref()));
for (index, field) in fields.unnamed.iter().enumerate() {
let field_attribute = FieldAttributeBuilder {
enable_name: true,
enable_ignore: true,
enable_method: true,
name: FieldName::Default,
}
.build_from_attributes(&field.attrs, traits)?;
if field_attribute.ignore {
pattern_token_stream.extend(quote!(_,));
continue;
}
let field_name_var = format_ident!("_{}", index);
let key = match field_attribute.name {
FieldName::Custom(name) => name,
FieldName::Default => field_name_var.clone(),
};
pattern_token_stream.extend(quote!(#field_name_var,));
let ty = &field.ty;
if let Some(method) = field_attribute.method {
block_token_stream.extend(super::common::create_format_arg(
ast,
ty,
&method,
quote!(#field_name_var),
));
block_token_stream.extend(if name_string.is_some() {
quote! (builder.field(stringify!(#key), &arg);)
} else {
quote! (builder.entry(&Educe__RawString(stringify!(#key)), &arg);)
});
} else {
debug_types.push(ty);
block_token_stream.extend(if name_string.is_some() {
quote! (builder.field(stringify!(#key), #field_name_var);)
} else {
quote! (builder.entry(&Educe__RawString(stringify!(#key)), #field_name_var);)
});
}
has_fields = true;
}
} else {
block_token_stream
.extend(quote!(let mut builder = f.debug_tuple(#name_string);));
for (index, field) in fields.unnamed.iter().enumerate() {
let field_attribute = FieldAttributeBuilder {
enable_name: false,
enable_ignore: true,
enable_method: true,
name: FieldName::Default,
}
.build_from_attributes(&field.attrs, traits)?;
if field_attribute.ignore {
pattern_token_stream.extend(quote!(_,));
continue;
}
let field_name_var = format_ident!("_{}", index);
pattern_token_stream.extend(quote!(#field_name_var,));
let ty = &field.ty;
if let Some(method) = field_attribute.method {
block_token_stream.extend(super::common::create_format_arg(
ast,
ty,
&method,
quote!(#field_name_var),
));
block_token_stream.extend(quote! (builder.field(&arg);));
} else {
debug_types.push(ty);
block_token_stream
.extend(quote! (builder.field(#field_name_var);));
}
has_fields = true;
}
}
if !has_fields && name_string.is_none() {
return Err(super::panic::unit_struct_need_name(variant_ident));
}
arms_token_stream.extend(quote! {
Self::#variant_ident ( #pattern_token_stream ) => {
#block_token_stream
builder.finish()
},
});
},
}
}
}
let ident = &ast.ident;
if arms_token_stream.is_empty() {
if let Some(ident) = name {
builder_token_stream.extend(quote! {
f.write_str(stringify!(#ident))
});
} else {
return Err(super::panic::unit_enum_need_name(ident));
}
} else {
builder_token_stream.extend(quote! {
match self {
#arms_token_stream
}
});
}
let bound = type_attribute.bound.into_where_predicates_by_generic_parameters_check_types(
&ast.generics.params,
&syn::parse2(quote!(::core::fmt::Debug)).unwrap(),
&debug_types,
&[],
);
let mut generics = ast.generics.clone();
let where_clause = generics.make_where_clause();
for where_predicate in bound {
where_clause.predicates.push(where_predicate);
}
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
token_stream.extend(quote! {
impl #impl_generics ::core::fmt::Debug for #ident #ty_generics #where_clause {
#[inline]
fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
#builder_token_stream
}
}
});
Ok(())
}
}
#[inline]
fn create_named_field_builder(name_string: Option<&str>) -> proc_macro2::TokenStream {
if let Some(name_string) = name_string {
quote!(let mut builder = f.debug_struct(#name_string);)
} else {
super::common::create_debug_map_builder()
}
}