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use crate::*;
use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::{Attribute, Item};
use crate::util::build_const;
pub struct Extractor;
impl Extractor {
/// 🔹 Nova função: coleta e gera constantes `#[stringify("NOME")]`
pub fn get_stringified_internal_constants(item: &mut Item) -> Vec<TokenStream> {
let mut consts = Vec::new();
match item {
Item::Struct(s) => {
// Itera sobre todos os campos da struct
for field in s.fields.iter_mut() {
// Coleta apenas atributos que devem ser mantidos
let mut retained_attrs = Vec::new();
for (index, attr) in field.attrs.iter().enumerate() {
if let Some(name) = Self::extract_stringify_name(attr) {
let mut clone_field = field.clone();
clone_field.attrs.remove(index);
let content = clone_field.to_token_stream().to_string();
consts.push(build_const(&name, &content));
// Se for `stringify`, não mantém o atributo
} else {
retained_attrs.push(attr.clone());
}
}
// Substitui os atributos pelos que não foram processados
field.attrs = retained_attrs;
}
}
Item::Impl(i) => {
// Para cada método dentro do impl
for impl_item in &mut i.items {
if let syn::ImplItem::Fn(method) = impl_item {
let mut retained_attrs = Vec::new();
for (index, attr) in method.attrs.iter().enumerate() {
if let Some(name) = Self::extract_stringify_name(attr) {
let mut cloned_method = method.clone();
cloned_method.attrs.remove(index);
let content = cloned_method.to_token_stream().to_string();
consts.push(build_const(&name, &content));
} else {
retained_attrs.push(attr.clone());
}
}
method.attrs = retained_attrs;
}
}
}
Item::Enum(e) => {
// Extrai as tags das variantes
for variant in &mut e.variants {
let mut retained_attrs = Vec::new();
for (index, attr) in variant.attrs.iter().enumerate() {
if let Some(name) = Self::extract_stringify_name(attr) {
let mut cloned_variant = variant.clone();
cloned_variant.attrs.remove(index);
let content = cloned_variant.to_token_stream().to_string();
consts.push(build_const(&name, &content));
} else {
retained_attrs.push(attr.clone());
}
}
variant.attrs = retained_attrs;
}
}
_ => {}
}
consts
}
fn extract_stringify_name(attr: &Attribute) -> Option<String> {
if OCCURRENCES
.iter()
.find(|&&o| attr.path().to_token_stream().to_string().contains(o))
.is_none()
{
return None;
}
// 1) Caso comum: #[attr("value")]
return Parameters::new_from_atribute(attr, &attr.to_token_stream()).map_or(None, |p|
{
Some(p.const_ident(&attr.to_token_stream()).to_string())
})
}
}