1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
//! The `GroupPattern` matches the `group!` and `group_structural!` macros and
//! extracts the type name or alias defined within them.
//! This is used to track type groups for code generation or analysis.
use std::collections::HashMap;
use syn::Item;
use syn::UseTree;
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();
};
// Collect `use` imports at the file level
let imports = collect_use_imports(&syntax.items);
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(analyze_item) = extract_group_item(&m.mac.tokens, &imports, "") {
items.push(analyze_item);
}
}
Item::Mod(item_mod) => {
if let Some((_, nested)) = &item_mod.content {
// Collect `use` imports inside this module
let inner_imports = collect_use_imports(nested);
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(analyze_item) = extract_group_item(
&m.mac.tokens,
&inner_imports,
&item_mod.ident.to_string(),
) {
items.push(analyze_item);
}
}
}
}
}
_ => {}
}
}
items
}
}
/// Extract an `AnalyzeItem` from the macro invocation tokens.
///
/// If the name matches a `use` import, resolves to the full foreign path.
/// For the `Alias = path::Type` form, returns a local item (the alias exists in-crate).
fn extract_group_item(
tokens: &proc_macro2::TokenStream,
imports: &HashMap<String, (String, String)>,
current_mod: &str,
) -> Option<AnalyzeItem> {
let name = extract_group_name(tokens)?;
let is_aliased = has_equals_sign(tokens);
if is_aliased {
// `group!(Alias = path::Type)` — alias lives in-crate
Some(AnalyzeItem::local(current_mod.to_string(), name))
} else if let Some((module, _)) = imports.get(&name) {
// `group!(TypeName)` where TypeName is imported via `use` — foreign
Some(AnalyzeItem::foreign(module.clone(), name))
} else {
// `group!(LocalType)` — local type
Some(AnalyzeItem::local(current_mod.to_string(), name))
}
}
/// Collect `use` imports from a list of top-level items.
///
/// Returns a map of `short_name → (module_path, short_name)`.
/// e.g. `use cargo_metadata::CompilerMessage;` → `"CompilerMessage" → ("cargo_metadata", "CompilerMessage")`
fn collect_use_imports(items: &[syn::Item]) -> HashMap<String, (String, String)> {
let mut map = HashMap::new();
for item in items {
if let Item::Use(use_item) = item {
// Only handle non-`pub use` (regular imports)
collect_from_use_tree(&use_item.tree, "", &mut map);
}
}
map
}
/// Recursively traverse a `UseTree` and collect named imports.
fn collect_from_use_tree(
tree: &UseTree,
prefix: &str,
map: &mut HashMap<String, (String, String)>,
) {
match tree {
UseTree::Name(name) => {
let module = prefix.to_string();
let alias = name.ident.to_string();
map.entry(alias).or_insert((module, name.ident.to_string()));
}
UseTree::Path(use_path) => {
let new_prefix = if prefix.is_empty() {
use_path.ident.to_string()
} else {
format!("{}::{}", prefix, use_path.ident)
};
collect_from_use_tree(&use_path.tree, &new_prefix, map);
}
UseTree::Rename(rename) => {
let module = prefix.to_string();
let alias = rename.ident.to_string();
map.entry(alias)
.or_insert((module, rename.ident.to_string()));
}
UseTree::Glob(_) => {
// `use path::*;` — skip glob imports
}
UseTree::Group(group) => {
for item in &group.items {
collect_from_use_tree(item, prefix, map);
}
}
}
}
/// Check whether the macro tokens contain `=`, indicating aliased form.
fn has_equals_sign(tokens: &proc_macro2::TokenStream) -> bool {
let stream = tokens.clone();
for token in stream {
if let proc_macro2::TokenTree::Punct(p) = token
&& p.as_char() == '='
{
return true;
}
}
false
}
/// 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,
}
}
}
|
