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use std::fmt::Write;
use std::str::FromStr;
use super::super::TraitHandler;
use super::models::{FieldAttributeBuilder, TypeAttributeBuilder};
use crate::Trait;
use proc_macro2::TokenStream;
use quote::quote;
use syn::{Data, DeriveInput, Fields, Generics, Meta};
pub struct PartialEqEnumHandler;
impl TraitHandler for PartialEqEnumHandler {
fn trait_meta_handler(
ast: &DeriveInput,
tokens: &mut TokenStream,
traits: &[Trait],
meta: &Meta,
) {
let type_attribute = TypeAttributeBuilder {
enable_flag: true,
enable_bound: true,
}
.from_partial_eq_meta(meta);
let enum_name = ast.ident.to_string();
let bound = type_attribute
.bound
.into_punctuated_where_predicates_by_generic_parameters(&ast.generics.params);
let mut comparer_tokens = TokenStream::new();
let mut match_tokens = String::from("match self {");
if let Data::Enum(data) = &ast.data {
for variant in data.variants.iter() {
let _ = TypeAttributeBuilder {
enable_flag: false,
enable_bound: false,
}
.from_attributes(&variant.attrs, traits);
let variant_ident = variant.ident.to_string();
match &variant.fields {
Fields::Unit => {
match_tokens.write_fmt(format_args!("{enum_name}::{variant_ident} => {{ if let {enum_name}::{variant_ident} = other {{ }} else {{ return false; }} }}", enum_name = enum_name, variant_ident = variant_ident)).unwrap();
}
Fields::Named(fields) => {
let mut pattern_tokens = String::new();
let mut pattern_2_tokens = String::new();
let mut block_tokens = String::new();
let mut field_attributes = Vec::new();
let mut field_names = Vec::new();
for field in fields.named.iter() {
let field_attribute = FieldAttributeBuilder {
enable_ignore: true,
enable_impl: true,
}
.from_attributes(&field.attrs, traits);
let field_name = field.ident.as_ref().unwrap().to_string();
if field_attribute.ignore {
pattern_tokens
.write_fmt(format_args!(
"{field_name}: _,",
field_name = field_name
))
.unwrap();
pattern_2_tokens
.write_fmt(format_args!(
"{field_name}: _,",
field_name = field_name
))
.unwrap();
continue;
}
pattern_tokens
.write_fmt(format_args!("{field_name},", field_name = field_name))
.unwrap();
pattern_2_tokens
.write_fmt(format_args!(
"{field_name}: ___{field_name},",
field_name = field_name
))
.unwrap();
field_attributes.push(field_attribute);
field_names.push(field_name);
}
for (index, field_attribute) in field_attributes.into_iter().enumerate() {
let field_name = &field_names[index];
let compare_trait = field_attribute.compare_trait;
let compare_method = field_attribute.compare_method;
match compare_trait {
Some(compare_trait) => {
let compare_method = compare_method.unwrap();
block_tokens.write_fmt(format_args!("if !{compare_trait}::{compare_method}({field_name}, ___{field_name}) {{ return false; }}", compare_trait = compare_trait, compare_method = compare_method, field_name = field_name)).unwrap();
}
None => {
match compare_method {
Some(compare_method) => {
block_tokens.write_fmt(format_args!("if !{compare_method}({field_name}, ___{field_name}) {{ return false; }}", compare_method = compare_method, field_name = field_name)).unwrap();
}
None => {
block_tokens.write_fmt(format_args!("if core::cmp::PartialEq::ne({field_name}, ___{field_name}) {{ return false; }}", field_name = field_name)).unwrap();
}
}
}
}
}
match_tokens.write_fmt(format_args!("{enum_name}::{variant_ident}{{ {pattern_tokens} }} => {{ if let {enum_name}::{variant_ident} {{ {pattern_2_tokens} }} = other {{ {block_tokens} }} else {{ return false; }} }}", enum_name = enum_name, variant_ident = variant_ident, pattern_tokens = pattern_tokens, pattern_2_tokens = pattern_2_tokens, block_tokens = block_tokens)).unwrap();
}
Fields::Unnamed(fields) => {
let mut pattern_tokens = String::new();
let mut pattern_2_tokens = String::new();
let mut block_tokens = String::new();
let mut field_attributes = Vec::new();
let mut field_names = Vec::new();
for (index, field) in fields.unnamed.iter().enumerate() {
let field_attribute = FieldAttributeBuilder {
enable_ignore: true,
enable_impl: true,
}
.from_attributes(&field.attrs, traits);
let field_name = format!("{}", index);
if field_attribute.ignore {
pattern_tokens.push_str("_,");
pattern_2_tokens.push_str("_,");
continue;
}
pattern_tokens
.write_fmt(format_args!("_{field_name},", field_name = field_name))
.unwrap();
pattern_2_tokens
.write_fmt(format_args!("__{field_name},", field_name = field_name))
.unwrap();
field_attributes.push(field_attribute);
field_names.push(field_name);
}
for (index, field_attribute) in field_attributes.into_iter().enumerate() {
let field_name = &field_names[index];
let compare_trait = field_attribute.compare_trait;
let compare_method = field_attribute.compare_method;
match compare_trait {
Some(compare_trait) => {
let compare_method = compare_method.unwrap();
block_tokens.write_fmt(format_args!("if !{compare_trait}::{compare_method}(_{field_name}, __{field_name}) {{ return false; }}", compare_trait = compare_trait, compare_method = compare_method, field_name = field_name)).unwrap();
}
None => {
match compare_method {
Some(compare_method) => {
block_tokens.write_fmt(format_args!("if !{compare_method}(_{field_name}, __{field_name}) {{ return false; }}", compare_method = compare_method, field_name = field_name)).unwrap();
}
None => {
block_tokens.write_fmt(format_args!("if core::cmp::PartialEq::ne(_{field_name}, __{field_name}) {{ return false; }}", field_name = field_name)).unwrap();
}
}
}
}
}
match_tokens.write_fmt(format_args!("{enum_name}::{variant_ident}( {pattern_tokens} ) => {{ if let {enum_name}::{variant_ident} ( {pattern_2_tokens} ) = other {{ {block_tokens} }} else {{ return false; }} }}", enum_name = enum_name, variant_ident = variant_ident, pattern_tokens = pattern_tokens, pattern_2_tokens = pattern_2_tokens, block_tokens = block_tokens)).unwrap();
}
}
}
}
match_tokens.push('}');
comparer_tokens.extend(TokenStream::from_str(&match_tokens).unwrap());
let ident = &ast.ident;
let mut generics_cloned: Generics = ast.generics.clone();
let where_clause = generics_cloned.make_where_clause();
for where_predicate in bound {
where_clause.predicates.push(where_predicate);
}
let (impl_generics, ty_generics, where_clause) = generics_cloned.split_for_impl();
let compare_impl = quote! {
impl #impl_generics core::cmp::PartialEq for #ident #ty_generics #where_clause {
#[inline]
#[allow(clippy::unneeded_field_pattern)]
fn eq(&self, other: &Self) -> bool {
#comparer_tokens
true
}
}
};
tokens.extend(compare_impl);
}
}
