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use syn::Item;
use crate::pattern_analyzer::{AnalyzeItem, AnalyzePattern};
/// Matches the `group!` and `group_structural!` macros.
///
/// Covered forms:
/// - `group!(TypeName)`
/// - `group!(Alias = path::Type)`
/// - `group_structural!(TypeName)`
/// - `group_structural!(Alias = path::Type)`
pub struct GroupPattern;
impl AnalyzePattern for GroupPattern {
fn contains(&self, content: &str) -> bool {
content.contains("group!") || content.contains("group_structural!")
}
fn analyze(&self, content: &str) -> Vec<AnalyzeItem> {
let Ok(syntax) = syn::parse_file(content) else {
return Vec::new();
};
let mut items = Vec::new();
for item in &syntax.items {
match item {
Item::Macro(m) => {
let Some(last) = m.mac.path.segments.last() else {
continue;
};
let macro_name = last.ident.to_string();
if macro_name != "group" && macro_name != "group_structural" {
continue;
}
if let Some(name) = extract_group_name(&m.mac.tokens) {
items.push(AnalyzeItem {
module: String::new(),
item_name: name,
});
}
}
Item::Mod(item_mod) => {
if let Some((_, nested)) = &item_mod.content {
for n in nested {
if let Item::Macro(m) = n {
let Some(last) = m.mac.path.segments.last() else {
continue;
};
let macro_name = last.ident.to_string();
if macro_name != "group" && macro_name != "group_structural" {
continue;
}
if let Some(name) = extract_group_name(&m.mac.tokens) {
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: name,
});
}
}
}
}
}
_ => {}
}
}
items
}
}
/// Extract the alias / type name from the arguments of `group!`.
///
/// - `group!(ParseIntError)` → `ParseIntError`
/// - `group!(ErrorIo = std::io::Error)` → `ErrorIo`
fn extract_group_name(tokens: &proc_macro2::TokenStream) -> Option<String> {
let stream = tokens.clone();
let mut iter = stream.into_iter();
loop {
match iter.next()? {
proc_macro2::TokenTree::Ident(ident) => {
let name = ident.to_string();
// Check if there is a `=` following
let next = iter.next();
match next {
Some(proc_macro2::TokenTree::Punct(p)) if p.as_char() == '=' => {
// group!(Alias = path::Type)
return Some(name);
}
_ => {
// group!(TypeName)
return Some(name);
}
}
}
_ => continue,
}
}
}
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