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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
use std::cmp::{Ord, Ordering};
use rustc_ast::ast;
use rustc_span::{symbol::sym, Span};
use crate::config::{Config, GroupImportsTactic};
use crate::imports::{normalize_use_trees_with_granularity, UseSegmentKind, UseTree};
use crate::items::{is_mod_decl, rewrite_extern_crate, rewrite_mod};
use crate::lists::{itemize_list, write_list, ListFormatting, ListItem};
use crate::rewrite::RewriteContext;
use crate::shape::Shape;
use crate::source_map::LineRangeUtils;
use crate::spanned::Spanned;
use crate::utils::{contains_skip, mk_sp};
use crate::visitor::FmtVisitor;
fn compare_items(a: &ast::Item, b: &ast::Item) -> Ordering {
match (&a.kind, &b.kind) {
(&ast::ItemKind::Mod(..), &ast::ItemKind::Mod(..)) => {
a.ident.as_str().cmp(b.ident.as_str())
}
(&ast::ItemKind::ExternCrate(ref a_name), &ast::ItemKind::ExternCrate(ref b_name)) => {
let a_orig_name = a_name.unwrap_or(a.ident.name);
let b_orig_name = b_name.unwrap_or(b.ident.name);
let result = a_orig_name.as_str().cmp(b_orig_name.as_str());
if result != Ordering::Equal {
return result;
}
match (a_name, b_name) {
(Some(..), None) => Ordering::Greater,
(None, Some(..)) => Ordering::Less,
(None, None) => Ordering::Equal,
(Some(..), Some(..)) => a.ident.as_str().cmp(b.ident.as_str()),
}
}
_ => unreachable!(),
}
}
fn wrap_reorderable_items(
context: &RewriteContext<'_>,
list_items: &[ListItem],
shape: Shape,
) -> Option<String> {
let fmt = ListFormatting::new(shape, context.config)
.separator("")
.align_comments(false);
write_list(list_items, &fmt)
}
fn rewrite_reorderable_item(
context: &RewriteContext<'_>,
item: &ast::Item,
shape: Shape,
) -> Option<String> {
match item.kind {
ast::ItemKind::ExternCrate(..) => rewrite_extern_crate(context, item, shape),
ast::ItemKind::Mod(..) => rewrite_mod(context, item, shape),
_ => None,
}
}
fn rewrite_reorderable_or_regroupable_items(
context: &RewriteContext<'_>,
reorderable_items: &[&ast::Item],
shape: Shape,
span: Span,
) -> Option<String> {
match reorderable_items[0].kind {
ast::ItemKind::Use(..) => {
let mut normalized_items: Vec<_> = reorderable_items
.iter()
.filter_map(|item| UseTree::from_ast_with_normalization(context, item))
.collect();
let cloned = normalized_items.clone();
let list_items = itemize_list(
context.snippet_provider,
cloned.iter(),
"",
";",
|item| item.span().lo(),
|item| item.span().hi(),
|_item| Some("".to_owned()),
span.lo(),
span.hi(),
false,
);
for (item, list_item) in normalized_items.iter_mut().zip(list_items) {
item.list_item = Some(list_item.clone());
}
normalized_items = normalize_use_trees_with_granularity(
normalized_items,
context.config.imports_granularity(),
);
let mut regrouped_items = match context.config.group_imports() {
GroupImportsTactic::Preserve | GroupImportsTactic::One => {
vec![normalized_items]
}
GroupImportsTactic::StdExternalCrate => group_imports(normalized_items),
};
if context.config.reorder_imports() {
regrouped_items.iter_mut().for_each(|items| items.sort())
}
let nested_shape = shape.offset_left(4)?.sub_width(1)?;
let item_vec: Vec<_> = regrouped_items
.into_iter()
.filter(|use_group| !use_group.is_empty())
.map(|use_group| {
let item_vec: Vec<_> = use_group
.into_iter()
.map(|use_tree| ListItem {
item: use_tree.rewrite_top_level(context, nested_shape),
..use_tree.list_item.unwrap_or_else(ListItem::empty)
})
.collect();
wrap_reorderable_items(context, &item_vec, nested_shape)
})
.collect::<Option<Vec<_>>>()?;
let join_string = format!("\n\n{}", shape.indent.to_string(context.config));
Some(item_vec.join(&join_string))
}
_ => {
let list_items = itemize_list(
context.snippet_provider,
reorderable_items.iter(),
"",
";",
|item| item.span().lo(),
|item| item.span().hi(),
|item| rewrite_reorderable_item(context, item, shape),
span.lo(),
span.hi(),
false,
);
let mut item_pair_vec: Vec<_> = list_items.zip(reorderable_items.iter()).collect();
item_pair_vec.sort_by(|a, b| compare_items(a.1, b.1));
let item_vec: Vec<_> = item_pair_vec.into_iter().map(|pair| pair.0).collect();
wrap_reorderable_items(context, &item_vec, shape)
}
}
}
fn contains_macro_use_attr(item: &ast::Item) -> bool {
crate::attr::contains_name(&item.attrs, sym::macro_use)
}
fn group_imports(uts: Vec<UseTree>) -> Vec<Vec<UseTree>> {
let mut std_imports = Vec::new();
let mut external_imports = Vec::new();
let mut local_imports = Vec::new();
for ut in uts.into_iter() {
if ut.path.is_empty() {
external_imports.push(ut);
continue;
}
match &ut.path[0].kind {
UseSegmentKind::Ident(id, _) => match id.as_ref() {
"std" | "alloc" | "core" => std_imports.push(ut),
_ => external_imports.push(ut),
},
UseSegmentKind::Slf(_) | UseSegmentKind::Super(_) | UseSegmentKind::Crate(_) => {
local_imports.push(ut)
}
UseSegmentKind::Glob | UseSegmentKind::List(_) => external_imports.push(ut),
}
}
vec![std_imports, external_imports, local_imports]
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
enum ReorderableItemKind {
ExternCrate,
Mod,
Use,
Other,
}
impl ReorderableItemKind {
fn from(item: &ast::Item) -> Self {
match item.kind {
_ if contains_macro_use_attr(item) | contains_skip(&item.attrs) => {
ReorderableItemKind::Other
}
ast::ItemKind::ExternCrate(..) => ReorderableItemKind::ExternCrate,
ast::ItemKind::Mod(..) if is_mod_decl(item) => ReorderableItemKind::Mod,
ast::ItemKind::Use(..) => ReorderableItemKind::Use,
_ => ReorderableItemKind::Other,
}
}
fn is_same_item_kind(self, item: &ast::Item) -> bool {
ReorderableItemKind::from(item) == self
}
fn is_reorderable(self, config: &Config) -> bool {
match self {
ReorderableItemKind::ExternCrate => config.reorder_imports(),
ReorderableItemKind::Mod => config.reorder_modules(),
ReorderableItemKind::Use => config.reorder_imports(),
ReorderableItemKind::Other => false,
}
}
fn is_regroupable(self, config: &Config) -> bool {
match self {
ReorderableItemKind::ExternCrate
| ReorderableItemKind::Mod
| ReorderableItemKind::Other => false,
ReorderableItemKind::Use => config.group_imports() != GroupImportsTactic::Preserve,
}
}
fn in_group(self, config: &Config) -> bool {
match self {
ReorderableItemKind::ExternCrate | ReorderableItemKind::Mod => true,
ReorderableItemKind::Use => config.group_imports() == GroupImportsTactic::Preserve,
ReorderableItemKind::Other => false,
}
}
}
impl<'b, 'a: 'b> FmtVisitor<'a> {
fn walk_reorderable_or_regroupable_items(
&mut self,
items: &[&ast::Item],
item_kind: ReorderableItemKind,
in_group: bool,
) -> usize {
let mut last = self.parse_sess.lookup_line_range(items[0].span());
let item_length = items
.iter()
.take_while(|ppi| {
item_kind.is_same_item_kind(&***ppi)
&& (!in_group || {
let current = self.parse_sess.lookup_line_range(ppi.span());
let in_same_group = current.lo < last.hi + 2;
last = current;
in_same_group
})
})
.count();
let items = &items[..item_length];
let at_least_one_in_file_lines = items
.iter()
.any(|item| !out_of_file_lines_range!(self, item.span));
if at_least_one_in_file_lines && !items.is_empty() {
let lo = items.first().unwrap().span().lo();
let hi = items.last().unwrap().span().hi();
let span = mk_sp(lo, hi);
let rw = rewrite_reorderable_or_regroupable_items(
&self.get_context(),
items,
self.shape(),
span,
);
self.push_rewrite(span, rw);
} else {
for item in items {
self.push_rewrite(item.span, None);
}
}
item_length
}
pub(crate) fn visit_items_with_reordering(&mut self, mut items: &[&ast::Item]) {
while !items.is_empty() {
let item_kind = ReorderableItemKind::from(items[0]);
if item_kind.is_reorderable(self.config) || item_kind.is_regroupable(self.config) {
let visited_items_num = self.walk_reorderable_or_regroupable_items(
items,
item_kind,
item_kind.in_group(self.config),
);
let (_, rest) = items.split_at(visited_items_num);
items = rest;
} else {
let (item, rest) = items.split_first().unwrap();
self.visit_item(item);
items = rest;
}
}
}
}