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use syn::Item;
use crate::pattern_analyzer::{AnalyzeItem, AnalyzePattern};
/// Matches types defined by `pack!`, `pack_err!`, `pack_structural!`, `pack_err_structural!` macros.
///
/// Covered forms:
/// - `pack!(TypeName = InnerType)`
/// - `pack! { TypeName = InnerType }`
/// - `pack_err!(TypeName)`
/// - `pack_err!(TypeName = InnerType)`
/// - `pack_structural!` series same as above
pub struct PackPattern;
impl AnalyzePattern for PackPattern {
fn contains(&self, content: &str) -> bool {
content.contains("pack!") || content.contains("pack_err!")
}
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 {
// Top-level macro calls
Item::Macro(m) => {
if let Some(name) = try_extract_pack_name(m) {
items.push(AnalyzeItem {
module: String::new(),
item_name: name,
});
}
}
// Macro calls inside inline modules
Item::Mod(item_mod) => {
if let Some((_, nested)) = &item_mod.content {
for n in nested {
if let Item::Macro(m) = n
&& let Some(name) = try_extract_pack_name(m) {
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: name,
});
}
}
}
}
_ => {}
}
}
items
}
}
/// If the macro call is `pack!` / `pack_err!` / etc., extract the registered type name.
fn try_extract_pack_name(m: &syn::ItemMacro) -> Option<String> {
let macro_name = m.mac.path.segments.last()?.ident.to_string();
match macro_name.as_str() {
"pack" | "pack_err" | "pack_structural" | "pack_err_structural" => {}
_ => return None,
}
let tokens = &m.mac.tokens;
// `pack!(T)` or `pack!(T = U)` — the first ident is the type name
// Parse simply with syn
if let Ok(ident) = syn::parse2::<syn::Ident>(tokens.clone()) {
// pack!(TypeName) — just a single ident
return Some(ident.to_string());
}
// Try to parse `Ident = Type`
// Clone tokens first to avoid partial consumption
let stream = tokens.clone();
let mut iter = stream.into_iter();
// Skip leading attributes/doc comments
loop {
match iter.next()? {
proc_macro2::TokenTree::Ident(ident) => {
// Found the first ident, this is the type name
let type_name = ident.to_string();
// Check if `=` follows
if let Some(proc_macro2::TokenTree::Punct(p)) = iter.next()
&& p.as_char() == '=' {
// pack!(TypeName = InnerType)
return Some(type_name);
}
// pack_err!(TypeName) — only a single ident
return Some(type_name);
}
_ => continue,
}
}
}
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