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use quote::ToTokens;
use syn::{Attribute, Lit, Meta, NestedMeta};
use super::super::super::create_path_string_from_lit_str;
use crate::{panic, Trait};
#[derive(Debug, Clone)]
pub struct FieldAttribute {
pub ignore: bool,
pub compare_method: Option<String>,
pub compare_trait: Option<String>,
pub rank: isize,
}
#[derive(Debug, Clone)]
pub struct FieldAttributeBuilder {
pub enable_ignore: bool,
pub enable_impl: bool,
pub rank: isize,
pub enable_rank: bool,
}
impl FieldAttributeBuilder {
#[allow(clippy::wrong_self_convention)]
pub fn from_ord_meta(&self, meta: &Meta) -> FieldAttribute {
let mut ignore = false;
let mut compare_method = None;
let mut compare_trait = None;
let mut rank = self.rank;
let correct_usage_for_ord_attribute = {
let mut usage = vec![];
if self.enable_ignore {
usage.push(stringify!(#[educe(Ord = false)]));
usage.push(stringify!(#[educe(Ord(false))]));
}
usage
};
let correct_usage_for_ignore = {
let usage = vec![stringify!(#[educe(Ord(ignore))])];
usage
};
let correct_usage_for_impl = {
let usage = vec![
stringify!(#[educe(Ord(method = "path_to_method"))]),
stringify!(#[educe(Ord(trait = "path_to_trait"))]),
stringify!(#[educe(Ord(trait = "path_to_trait", method = "path_to_method_in_trait"))]),
stringify!(#[educe(Ord(method("path_to_method")))]),
stringify!(#[educe(Ord(trait("path_to_trait")))]),
stringify!(#[educe(Ord(trait("path_to_trait"), method("path_to_method_in_trait")))]),
];
usage
};
let correct_usage_for_rank = {
let usage = vec![
stringify!(#[educe(Ord(rank = priority_value))]),
stringify!(#[educe(Ord(rank(priority_value)))]),
];
usage
};
let mut rank_is_set = false;
match meta {
Meta::List(list) => {
let mut ignore_is_set = false;
for p in list.nested.iter() {
match p {
NestedMeta::Meta(meta) => {
let meta_name = meta.path().into_token_stream().to_string();
match meta_name.as_str() {
"ignore" => {
if !self.enable_ignore {
panic::unknown_parameter("Ord", meta_name.as_str());
}
match meta {
Meta::Path(_) => {
if ignore_is_set {
panic::reset_parameter(meta_name.as_str());
}
ignore_is_set = true;
ignore = true;
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_ignore,
),
}
},
"method" => {
if !self.enable_impl {
panic::unknown_parameter("Ord", meta_name.as_str());
}
match meta {
Meta::List(list) => {
for p in list.nested.iter() {
match p {
NestedMeta::Lit(Lit::Str(s)) => {
if compare_method.is_some() {
panic::reset_parameter(
meta_name.as_str(),
);
}
let s = create_path_string_from_lit_str(s);
if let Some(s) = s {
compare_method = Some(s);
} else {
panic::empty_parameter(
meta_name.as_str(),
);
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_impl,
),
}
}
},
Meta::NameValue(named_value) => {
let lit = &named_value.lit;
match lit {
Lit::Str(s) => {
if compare_method.is_some() {
panic::reset_parameter(meta_name.as_str());
}
let s = create_path_string_from_lit_str(s);
if let Some(s) = s {
compare_method = Some(s);
} else {
panic::empty_parameter(meta_name.as_str());
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_impl,
),
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_impl,
),
}
},
"trait" => {
if !self.enable_impl {
panic::unknown_parameter("Ord", meta_name.as_str());
}
match meta {
Meta::List(list) => {
for p in list.nested.iter() {
match p {
NestedMeta::Lit(Lit::Str(s)) => {
if compare_trait.is_some() {
panic::reset_parameter(
meta_name.as_str(),
);
}
let s = create_path_string_from_lit_str(s);
if let Some(s) = s {
compare_trait = Some(s);
} else {
panic::empty_parameter(
meta_name.as_str(),
);
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_impl,
),
}
}
},
Meta::NameValue(named_value) => {
let lit = &named_value.lit;
match lit {
Lit::Str(s) => {
if compare_trait.is_some() {
panic::reset_parameter(meta_name.as_str());
}
let s = create_path_string_from_lit_str(s);
if let Some(s) = s {
compare_trait = Some(s);
} else {
panic::empty_parameter(meta_name.as_str());
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_impl,
),
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_impl,
),
}
},
"rank" => {
if !self.enable_rank {
panic::unknown_parameter("Ord", meta_name.as_str());
}
match meta {
Meta::List(list) => {
for p in list.nested.iter() {
match p {
NestedMeta::Lit(Lit::Int(i)) => {
if rank_is_set {
panic::reset_parameter(
meta_name.as_str(),
);
}
rank_is_set = true;
rank = i.base10_parse().unwrap();
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_rank,
),
}
}
},
Meta::NameValue(named_value) => {
let lit = &named_value.lit;
match lit {
Lit::Int(i) => {
if rank_is_set {
panic::reset_parameter(meta_name.as_str());
}
rank_is_set = true;
rank = i.base10_parse().unwrap();
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_rank,
),
}
},
_ => panic::parameter_incorrect_format(
meta_name.as_str(),
&correct_usage_for_rank,
),
}
},
_ => panic::unknown_parameter("Ord", meta_name.as_str()),
}
},
_ => panic::attribute_incorrect_format(
"Ord",
&correct_usage_for_ord_attribute,
),
}
}
},
_ => panic::attribute_incorrect_format("Ord", &correct_usage_for_ord_attribute),
}
if compare_trait.is_some() && compare_method.is_none() {
compare_method = Some("cmp".to_string());
}
if ignore && rank_is_set {
panic::ignore_ranked_field();
}
FieldAttribute {
ignore,
compare_method,
compare_trait,
rank,
}
}
#[allow(clippy::wrong_self_convention)]
pub fn from_attributes(self, attributes: &[Attribute], traits: &[Trait]) -> FieldAttribute {
let mut result = None;
for attribute in attributes.iter() {
if attribute.path.is_ident("educe") {
let meta = attribute.parse_meta().unwrap();
match meta {
Meta::List(list) => {
for p in list.nested.iter() {
match p {
NestedMeta::Meta(meta) => {
let meta_name = meta.path().into_token_stream().to_string();
let t = Trait::from_str(meta_name);
if traits.binary_search(&t).is_err() {
panic::trait_not_used(t);
}
if t == Trait::Ord {
if result.is_some() {
panic::reuse_a_trait(t);
}
result = Some(self.from_ord_meta(meta));
}
},
_ => panic::educe_format_incorrect(),
}
}
},
_ => panic::educe_format_incorrect(),
}
}
}
result.unwrap_or(FieldAttribute {
ignore: false,
compare_method: None,
compare_trait: None,
rank: self.rank,
})
}
}