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use crate::args_parsing::*;
use crate::base_types::*;
use crate::AbsDiffEqParser;
impl AbsDiffEqParser {
pub fn get_rel_eq_single_field(
&self,
xi: syn::Ident,
yi: syn::Ident,
field_with_args: &FieldWithArgs,
) -> Option<proc_macro2::TokenStream> {
if let Some(FieldFormatted {
base_type,
own_field,
other_field,
epsilon,
max_relative,
set_equal,
mapping,
use_iterator,
}) = self.format_nth_field(0, field_with_args, Some((xi, yi)))
{
if set_equal {
Some(quote::quote!(#own_field == #other_field))
} else if let Some(map) = mapping {
Some(quote::quote!(
(if let ((Some(a), Some(b))) = (
(#map)(#own_field),
(#map)(#other_field)
) {
#ApproxName::RelativeEq::relative_eq(&a, &b, #epsilon, #max_relative)
} else {
false
})
))
} else if use_iterator {
Some(quote::quote!(({
let mut iter1 = core::iter::IntoIterator::into_iter(*#own_field);
let mut iter2 = core::iter::IntoIterator::into_iter(*#other_field);
let mut res = true;
loop {
match (iter1.next(), iter2.next()) {
(None, None) => break,
(Some(a), Some(b)) => {
if !#ApproxName::RelativeEq::relative_eq(a, b, #epsilon, #max_relative) {
res = false;
break;
}
},
_ => {
res = false;
break;
}
}
}
res
})))
} else {
Some(quote::quote!(
<#base_type as #ApproxName::RelativeEq>::relative_eq(
#own_field,
#other_field,
#epsilon,
#max_relative
)
))
}
} else {
None
}
}
fn get_rel_eq_struct_fields(
&self,
fields_with_args: &[FieldWithArgs],
) -> Vec<proc_macro2::TokenStream> {
// We need to extend the where clause for all generics
let fields = fields_with_args
.iter()
.enumerate()
.filter_map(|(n, field_with_args)| {
if let Some(FieldFormatted {
base_type,
own_field,
other_field,
epsilon,
#[allow(unused)]
max_relative,
set_equal,
mapping,
use_iterator,
}) = self.format_nth_field(n, field_with_args, None)
{
if set_equal {
Some(quote::quote!(#own_field == #other_field &&))
} else if let Some(map) = mapping {
Some(quote::quote!(
(if let ((Some(a), Some(b))) = (
(#map)(#own_field),
(#map)(#other_field)
) {
#ApproxName::RelativeEq::relative_eq(&a, &b, #epsilon, #max_relative)
} else {
false
}) &&
))
} else if use_iterator {
Some(quote::quote!(({
let mut iter1 = core::iter::IntoIterator::into_iter(#own_field);
let mut iter2 = core::iter::IntoIterator::into_iter(#other_field);
let mut res = true;
loop {
match (iter1.next(), iter2.next()) {
(None, None) => break,
(Some(a), Some(b)) => {
if !#ApproxName::RelativeEq::relative_eq(
a,
b,
#epsilon,
#max_relative
) {
res = false;
break;
}
},
_ => {
res = false;
break;
}
}
}
res
}) &&))
} else {
Some(quote::quote!(
<#base_type as #ApproxName::RelativeEq>::relative_eq(
#own_field,
#other_field,
#epsilon,
#max_relative,
) &&
))
}
} else {
None
}
});
fields.collect()
}
fn get_rel_eq_variants(
&self,
variants_with_args: &[EnumVariant],
) -> Vec<proc_macro2::TokenStream> {
variants_with_args
.iter()
.map(|variant_with_args| {
let variant = &variant_with_args.ident;
use syn::spanned::Spanned;
let gen_field_names = |var: &str| -> Vec<syn::Ident> {
variant_with_args
.fields_with_args
.iter()
.enumerate()
.map(|(n, field)| syn::Ident::new(&format!("{var}{n}"), field.ident.span()))
.collect()
};
if variant_with_args
.fields_with_args
.first()
.and_then(|f| f.ident.clone())
.is_some()
{
let field_placeholders1 = gen_field_names("x");
let field_placeholders2 = gen_field_names("y");
let gen_combos = |iterator: Vec<syn::Ident>| {
iterator
.iter()
.zip(&variant_with_args.fields_with_args)
.map(|(fph, fwa)| {
let id = &fwa.ident;
quote::quote!(#id: #fph)
})
.collect::<Vec<_>>()
};
let comps: Vec<_> = field_placeholders1
.iter()
.zip(field_placeholders2.iter())
.zip(variant_with_args.fields_with_args.iter())
.map(|((xi, yi), field)| {
self.get_rel_eq_single_field(xi.clone(), yi.clone(), field)
})
.collect();
let field_name_placeholder_combos1 = gen_combos(field_placeholders1);
let field_name_placeholder_combos2 = gen_combos(field_placeholders2);
quote::quote!(
(
Self:: #variant {
#(#field_name_placeholder_combos1),*
},
Self:: #variant {
#(#field_name_placeholder_combos2),*
}
) => #(#comps) &&*,
)
} else if !variant_with_args.fields_with_args.is_empty() {
let field_names1 = gen_field_names("x");
let field_names2 = gen_field_names("y");
let comps: Vec<_> = field_names1
.iter()
.zip(field_names2.iter())
.zip(variant_with_args.fields_with_args.iter())
.map(|((xi, yi), field)| {
self.get_rel_eq_single_field(xi.clone(), yi.clone(), field)
})
.collect();
quote::quote!(
(
Self:: #variant (#(#field_names1),*),
Self:: #variant (#(#field_names2),*)
) => {#(#comps) &&*},
)
} else {
quote::quote!(
(Self::#variant, Self::#variant) => true,
)
}
})
.collect()
}
pub fn implement_derive_rel_diff_eq(&self) -> proc_macro2::TokenStream {
let obj_name = &self.base_type.ident();
let max_relative_default_value = self.get_max_relative_default_value();
let (impl_generics, ty_generics, _) = self.base_type.generics().split_for_impl();
let where_clause = self.generate_where_clause(false);
match &self.base_type {
#[allow(unused)]
BaseType::Struct {
item_struct,
fields_with_args,
} => {
let fields = self.get_rel_eq_struct_fields(fields_with_args);
quote::quote!(
const _ : () = {
#[automatically_derived]
impl #impl_generics #ApproxName::RelativeEq for #obj_name #ty_generics
#where_clause
{
fn default_max_relative() -> Self::Epsilon {
#max_relative_default_value
}
fn relative_eq(
&self,
other: &Self,
epsilon: Self::Epsilon,
max_relative: Self::Epsilon
) -> bool {
#(#fields)*
true
}
}
};
)
}
#[allow(unused)]
BaseType::Enum {
item_enum,
variants_with_args,
} => {
let variants = self.get_rel_eq_variants(variants_with_args);
quote::quote!(
const _: () = {
#[automatically_derived]
impl #impl_generics #ApproxName::RelativeEq for #obj_name #ty_generics
#where_clause
{
fn default_max_relative() -> Self::Epsilon {
#max_relative_default_value
}
fn relative_eq(
&self,
other: &Self,
epsilon: Self::Epsilon,
max_relative: Self::Epsilon
) -> bool {
match (self, other) {
#(#variants)*
_ => false,
}
}
}
};
)
}
}
}
}