1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290
use std::{fmt::Write, str::FromStr};
use proc_macro2::TokenStream;
use quote::quote;
use syn::{Data, DeriveInput, Fields, Generics, Meta};
use super::{
super::TraitHandler,
models::{FieldAttributeBuilder, TypeAttributeBuilder},
};
use crate::Trait;
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 => {
// TODO 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) => {
// TODO Struct
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) => {
// TODO Tuple
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);
}
}