-
Notifications
You must be signed in to change notification settings - Fork 278
/
ast.rs
1365 lines (1272 loc) · 45.7 KB
/
ast.rs
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
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
use crate::ast_types::Path as RacerPath;
use crate::ast_types::{
self, GenericsArgs, ImplHeader, Pat, PathAlias, PathAliasKind, TraitBounds, Ty,
};
use crate::core::{self, BytePos, ByteRange, Match, MatchType, Scope, Session, SessionExt};
use crate::nameres;
use crate::typeinf;
use std::path::Path;
use std::rc::Rc;
use rustc_ast::ast::{self, ExprKind, FnRetTy, ItemKind, PatKind, UseTree, UseTreeKind};
use rustc_ast::{self, visit};
use rustc_data_structures::sync::Lrc;
use rustc_errors::emitter::Emitter;
use rustc_errors::{Diagnostic, Handler};
use rustc_parse::new_parser_from_source_str;
use rustc_parse::parser::{ForceCollect, Parser};
use rustc_session::parse::ParseSess;
use rustc_span::edition::Edition;
use rustc_span::source_map::{self, FileName, SourceMap};
use rustc_span::Span;
struct DummyEmitter;
impl Emitter for DummyEmitter {
fn emit_diagnostic(&mut self, _db: &Diagnostic) {}
fn source_map(&self) -> Option<&Lrc<SourceMap>> {
None
}
fn should_show_explain(&self) -> bool {
false
}
}
/// construct parser from string
// From syntax/util/parser_testing.rs
pub fn string_to_parser(ps: &ParseSess, source_str: String) -> Parser<'_> {
new_parser_from_source_str(ps, FileName::Custom("racer-file".to_owned()), source_str)
}
/// Get parser from string s and then apply closure f to it
// TODO: use Result insated of Option
pub fn with_error_checking_parse<F, T>(s: String, f: F) -> Option<T>
where
F: FnOnce(&mut Parser<'_>) -> Option<T>,
{
// FIXME: Set correct edition based on the edition of the target crate.
rustc_span::with_session_globals(Edition::Edition2018, || {
let codemap = Rc::new(SourceMap::new(source_map::FilePathMapping::empty()));
// We use DummyEmitter here not to print error messages to stderr
let handler = Handler::with_emitter(false, None, Box::new(DummyEmitter {}));
let parse_sess = ParseSess::with_span_handler(handler, codemap);
let mut p = string_to_parser(&parse_sess, s);
f(&mut p)
})
}
/// parse string source_str as statement and then apply f to it
/// return false if we can't parse s as statement
// TODO: make F FnOnce(&ast::Stmt) -> Result<Something, Error>
pub fn with_stmt<F>(source_str: String, f: F) -> bool
where
F: FnOnce(&ast::Stmt),
{
with_error_checking_parse(source_str, |p| {
let stmt = match p.parse_stmt(ForceCollect::No) {
Ok(Some(stmt)) => stmt,
_ => return None,
};
f(&stmt);
Some(())
})
.is_some()
}
pub(crate) fn destruct_span(span: Span) -> (u32, u32) {
let source_map::BytePos(lo) = span.lo();
let source_map::BytePos(hi) = span.hi();
(lo, hi)
}
pub(crate) fn get_span_start(span: Span) -> u32 {
let source_map::BytePos(lo) = span.lo();
lo
}
/// collect paths from syntax::ast::UseTree
#[derive(Debug)]
pub struct UseVisitor {
pub path_list: Vec<PathAlias>,
pub contains_glob: bool,
}
impl<'ast> visit::Visitor<'ast> for UseVisitor {
fn visit_item(&mut self, i: &ast::Item) {
// collect items from use tree recursively
// returns (Paths, contains_glab)
fn collect_nested_items(
use_tree: &UseTree,
parent_path: Option<&ast_types::Path>,
) -> (Vec<PathAlias>, bool) {
let mut res = vec![];
let mut path = if let Some(parent) = parent_path {
let relative_path = RacerPath::from_ast_nogen(&use_tree.prefix);
let mut path = parent.clone();
path.extend(relative_path);
path
} else {
RacerPath::from_ast_nogen(&use_tree.prefix)
};
let mut contains_glob = false;
match use_tree.kind {
UseTreeKind::Simple(rename, _, _) => {
let ident = use_tree.ident().name.to_string();
let rename_pos: Option<BytePos> =
rename.map(|id| destruct_span(id.span).0.into());
let kind = if let Some(last_seg) = path.segments.last() {
//` self` is treated normaly in libsyntax,
// but we distinguish it here to make completion easy
if last_seg.name == "self" {
PathAliasKind::Self_(ident, rename_pos)
} else {
PathAliasKind::Ident(ident, rename_pos)
}
} else {
PathAliasKind::Ident(ident, rename_pos)
};
if let PathAliasKind::Self_(..) = kind {
path.segments.pop();
}
res.push(PathAlias {
kind,
path,
range: ByteRange::from(use_tree.span),
});
}
UseTreeKind::Nested(ref nested) => {
nested.iter().for_each(|(ref tree, _)| {
let (items, has_glob) = collect_nested_items(tree, Some(&path));
res.extend(items);
contains_glob |= has_glob;
});
}
UseTreeKind::Glob => {
res.push(PathAlias {
kind: PathAliasKind::Glob,
path,
range: ByteRange::from(use_tree.span),
});
contains_glob = true;
}
}
(res, contains_glob)
}
if let ItemKind::Use(ref use_tree) = i.kind {
let (path_list, contains_glob) = collect_nested_items(use_tree, None);
self.path_list = path_list;
self.contains_glob = contains_glob;
}
}
}
pub struct PatBindVisitor {
ident_points: Vec<ByteRange>,
}
impl<'ast> visit::Visitor<'ast> for PatBindVisitor {
fn visit_local(&mut self, local: &ast::Local) {
// don't visit the RHS (init) side of the let stmt
self.visit_pat(&local.pat);
}
fn visit_expr(&mut self, ex: &ast::Expr) {
// don't visit the RHS or block of an 'if let' or 'for' stmt
match &ex.kind {
ExprKind::If(let_stmt, ..) | ExprKind::While(let_stmt, ..) => {
if let ExprKind::Let(pat, ..) = &let_stmt.kind {
self.visit_pat(pat);
}
}
ExprKind::ForLoop(pat, ..) => self.visit_pat(pat),
_ => visit::walk_expr(self, ex),
}
}
fn visit_pat(&mut self, p: &ast::Pat) {
match p.kind {
PatKind::Ident(_, ref spannedident, _) => {
self.ident_points.push(spannedident.span.into());
}
_ => {
visit::walk_pat(self, p);
}
}
}
}
pub struct PatVisitor {
ident_points: Vec<ByteRange>,
}
impl<'ast> visit::Visitor<'ast> for PatVisitor {
fn visit_pat(&mut self, p: &ast::Pat) {
match p.kind {
PatKind::Ident(_, ref spannedident, _) => {
self.ident_points.push(spannedident.span.into());
}
_ => {
visit::walk_pat(self, p);
}
}
}
}
pub struct FnArgVisitor {
idents: Vec<(Pat, Option<Ty>, ByteRange)>,
generics: GenericsArgs,
scope: Scope,
offset: i32,
}
impl<'ast> visit::Visitor<'ast> for FnArgVisitor {
fn visit_fn(&mut self, fk: visit::FnKind<'_>, _: source_map::Span, _: ast::NodeId) {
let fd = match fk {
visit::FnKind::Fn(_, _, ref fn_sig, _, _) => &*fn_sig.decl,
visit::FnKind::Closure(ref fn_decl, _) => fn_decl,
};
debug!("[FnArgVisitor::visit_fn] inputs: {:?}", fd.inputs);
self.idents = fd
.inputs
.iter()
.map(|arg| {
debug!("[FnArgTypeVisitor::visit_fn] type {:?} was found", arg.ty);
let pat = Pat::from_ast(&arg.pat.kind, &self.scope);
let ty = Ty::from_ast(&arg.ty, &self.scope);
let source_map::BytePos(lo) = arg.pat.span.lo();
let source_map::BytePos(hi) = arg.ty.span.hi();
(pat, ty, ByteRange::new(lo, hi))
})
.collect();
}
fn visit_generics(&mut self, g: &'ast ast::Generics) {
let generics = GenericsArgs::from_generics(g, &self.scope.filepath, self.offset);
self.generics.extend(generics);
}
}
fn point_is_in_span(point: BytePos, span: &Span) -> bool {
let point: u32 = point.0 as u32;
let (lo, hi) = destruct_span(*span);
point >= lo && point < hi
}
// The point must point to an ident within the pattern.
fn destructure_pattern_to_ty(
pat: &ast::Pat,
point: BytePos,
ty: &Ty,
scope: &Scope,
session: &Session<'_>,
) -> Option<Ty> {
debug!(
"destructure_pattern_to_ty point {:?} ty {:?} pat: {:?}",
point, ty, pat.kind
);
match pat.kind {
PatKind::Ident(_, ref spannedident, _) => {
if point_is_in_span(point, &spannedident.span) {
debug!("destructure_pattern_to_ty matched an ident!");
Some(ty.clone())
} else {
panic!(
"Expecting the point to be in the patident span. pt: {:?}",
point
);
}
}
PatKind::Tuple(ref tuple_elements) => match *ty {
Ty::Tuple(ref typeelems) => {
for (i, p) in tuple_elements.iter().enumerate() {
if !point_is_in_span(point, &p.span) {
continue;
}
if let Some(ref ty) = typeelems[i] {
return destructure_pattern_to_ty(p, point, ty, scope, session);
}
}
None
}
_ => panic!("Expecting TyTuple"),
},
PatKind::TupleStruct(ref path, ref children) => {
let m = resolve_ast_path(path, &scope.filepath, scope.point, session)?;
let contextty = path_to_match(ty.clone(), session);
for (i, p) in children.iter().enumerate() {
if point_is_in_span(point, &p.span) {
return typeinf::get_tuplestruct_field_type(i, &m, session)
.and_then(|ty| {
// if context ty is a match, use its generics
if let Some(Ty::Match(ref contextm)) = contextty {
path_to_match_including_generics(
ty,
contextm.to_generics(),
session,
)
} else {
path_to_match(ty, session)
}
})
.and_then(|ty| destructure_pattern_to_ty(p, point, &ty, scope, session));
}
}
None
}
PatKind::Struct(ref path, ref children, _) => {
let m = resolve_ast_path(path, &scope.filepath, scope.point, session)?;
let contextty = path_to_match(ty.clone(), session);
for child in children {
if point_is_in_span(point, &child.span) {
return typeinf::get_struct_field_type(&child.ident.name.as_str(), &m, session)
.and_then(|ty| {
if let Some(Ty::Match(ref contextm)) = contextty {
path_to_match_including_generics(
ty,
contextm.to_generics(),
session,
)
} else {
path_to_match(ty, session)
}
})
.and_then(|ty| {
destructure_pattern_to_ty(&child.pat, point, &ty, scope, session)
});
}
}
None
}
_ => {
debug!("Could not destructure pattern {:?}", pat);
None
}
}
}
struct LetTypeVisitor<'c, 's> {
scope: Scope,
session: &'s Session<'c>,
pos: BytePos, // pos is relative to the srctxt, scope is global
result: Option<Ty>,
}
impl<'c, 's, 'ast> visit::Visitor<'ast> for LetTypeVisitor<'c, 's> {
fn visit_local(&mut self, local: &ast::Local) {
let ty = match &local.ty {
Some(annon) => Ty::from_ast(&*annon, &self.scope),
None => local.init.as_ref().and_then(|initexpr| {
debug!("[LetTypeVisitor] initexpr is {:?}", initexpr.kind);
let mut v = ExprTypeVisitor::new(self.scope.clone(), self.session);
v.visit_expr(initexpr);
v.result
}),
};
debug!("[LetTypeVisitor] ty is {:?}. pos is {:?}", ty, self.pos);
self.result = ty
.and_then(|ty| {
destructure_pattern_to_ty(&local.pat, self.pos, &ty, &self.scope, self.session)
})
.and_then(|ty| path_to_match(ty, self.session));
}
}
struct MatchTypeVisitor<'c, 's> {
scope: Scope,
session: &'s Session<'c>,
pos: BytePos, // pos is relative to the srctxt, scope is global
result: Option<Ty>,
}
impl<'c, 's, 'ast> visit::Visitor<'ast> for MatchTypeVisitor<'c, 's> {
fn visit_expr(&mut self, ex: &ast::Expr) {
if let ExprKind::Match(ref subexpression, ref arms) = ex.kind {
debug!("PHIL sub expr is {:?}", subexpression);
let mut v = ExprTypeVisitor::new(self.scope.clone(), self.session);
v.visit_expr(subexpression);
debug!("PHIL sub type is {:?}", v.result);
for arm in arms {
if !point_is_in_span(self.pos, &arm.pat.span) {
continue;
}
debug!("PHIL point is in pattern |{:?}|", arm.pat);
self.result = v
.result
.as_ref()
.and_then(|ty| {
destructure_pattern_to_ty(&arm.pat, self.pos, ty, &self.scope, self.session)
})
.and_then(|ty| path_to_match(ty, self.session));
}
}
}
}
fn resolve_ast_path(
path: &ast::Path,
filepath: &Path,
pos: BytePos,
session: &Session<'_>,
) -> Option<Match> {
let scope = Scope::new(filepath.to_owned(), pos);
let path = RacerPath::from_ast(path, &scope);
nameres::resolve_path_with_primitive(
&path,
filepath,
pos,
core::SearchType::ExactMatch,
core::Namespace::Path,
session,
)
.into_iter()
.nth(0)
}
fn path_to_match(ty: Ty, session: &Session<'_>) -> Option<Ty> {
match ty {
Ty::PathSearch(paths) => {
find_type_match(&paths.path, &paths.filepath, paths.point, session).map(Ty::Match)
}
Ty::RefPtr(ty, _) => path_to_match(*ty, session),
_ => Some(ty),
}
}
pub(crate) fn find_type_match(
path: &RacerPath,
fpath: &Path,
pos: BytePos,
session: &Session<'_>,
) -> Option<Match> {
debug!("find_type_match {:?}, {:?}", path, fpath);
let mut res = nameres::resolve_path_with_primitive(
path,
fpath,
pos,
core::SearchType::ExactMatch,
core::Namespace::Type,
session,
)
.into_iter()
.nth(0)
.and_then(|m| match m.mtype {
MatchType::Type => typeinf::get_type_of_typedef(&m, session),
_ => Some(m),
})?;
// TODO: 'Type' support
// if res is Enum/Struct and has a generic type paramter, let's resolve it.
for (param, typ) in res.generics_mut().zip(path.generic_types()) {
param.resolve(typ.to_owned());
}
Some(res)
}
struct ExprTypeVisitor<'c, 's> {
scope: Scope,
session: &'s Session<'c>,
// what we have before calling typeinf::get_type_of_match
path_match: Option<Match>,
result: Option<Ty>,
}
impl<'c: 's, 's> ExprTypeVisitor<'c, 's> {
fn new(scope: Scope, session: &'s Session<'c>) -> Self {
ExprTypeVisitor {
scope,
session,
path_match: None,
result: None,
}
}
fn same_scope(&self) -> Self {
Self {
scope: self.scope.clone(),
session: self.session,
path_match: None,
result: None,
}
}
}
impl<'c, 's, 'ast> visit::Visitor<'ast> for ExprTypeVisitor<'c, 's> {
fn visit_expr(&mut self, expr: &ast::Expr) {
debug!(
"ExprTypeVisitor::visit_expr {:?}(kind: {:?})",
expr, expr.kind
);
//walk_expr(self, ex, e)
match expr.kind {
ExprKind::Unary(_, ref expr) | ExprKind::AddrOf(_, _, ref expr) => {
self.visit_expr(expr);
}
ExprKind::Path(_, ref path) => {
let source_map::BytePos(lo) = path.span.lo();
self.result = resolve_ast_path(
path,
&self.scope.filepath,
self.scope.point + lo.into(),
self.session,
)
.and_then(|m| {
let msrc = self.session.load_source_file(&m.filepath);
self.path_match = Some(m.clone());
typeinf::get_type_of_match(m, msrc.as_src(), self.session)
});
}
ExprKind::Call(ref callee_expression, ref caller_expr) => {
self.visit_expr(callee_expression);
self.result = self.result.take().and_then(|m| {
if let Ty::Match(mut m) = m {
match m.mtype {
MatchType::Function => {
typeinf::get_return_type_of_function(&m, &m, self.session)
.and_then(|ty| path_to_match(ty, self.session))
}
MatchType::Method(ref gen) => {
let mut return_ty = typeinf::get_return_type_of_function(&m, &m, self.session);
// Account for already resolved generics if the return type is Self
// (in which case we return bare type as found in the `impl` header)
if let (Some(Ty::Match(ref mut m)), Some(gen)) = (&mut return_ty, gen) {
for (type_param, arg) in m.generics_mut().zip(gen.args()) {
if let Some(resolved) = arg.resolved() {
type_param.resolve(resolved.clone());
}
}
}
return_ty.and_then(
|ty| {
path_to_match_including_generics(
ty,
gen.as_ref().map(AsRef::as_ref),
self.session,
)
},
)
}
// if we find tuple struct / enum variant, try to resolve its generics name
MatchType::Struct(ref mut gen)
| MatchType::Enum(ref mut gen)
| MatchType::Union(ref mut gen) => {
if gen.is_empty() {
return Some(Ty::Match(m));
}
let tuple_fields = match self.path_match {
Some(ref m) => typeinf::get_tuplestruct_fields(m, self.session),
None => return Some(Ty::Match(m)),
};
// search what is in callee e.g. Some(String::new()<-) for generics
for ((_, _, ty), expr) in tuple_fields.into_iter().zip(caller_expr)
{
let ty = try_continue!(ty).dereference();
if let Ty::PathSearch(paths) = ty {
let (id, _) =
try_continue!(gen.search_param_by_path(&paths.path));
let mut visitor = self.same_scope();
visitor.visit_expr(expr);
if let Some(ty) = visitor.result {
gen.0[id].resolve(ty.dereference());
}
}
}
Some(Ty::Match(m))
}
MatchType::TypeParameter(ref traitbounds)
if traitbounds.has_closure() =>
{
let mut output = None;
if let Some(path_search) = traitbounds.get_closure() {
for seg in path_search.path.segments.iter() {
if seg.output.is_some() {
output = seg.output.clone();
break;
}
}
}
output
}
_ => {
debug!(
"ExprTypeVisitor: Cannot handle ExprCall of {:?} type",
m.mtype
);
None
}
}
} else {
None
}
});
}
ExprKind::Struct(ref path, _, _) => {
let pathvec = RacerPath::from_ast(path, &self.scope);
self.result = find_type_match(
&pathvec,
&self.scope.filepath,
self.scope.point,
self.session,
)
.map(Ty::Match);
}
ExprKind::MethodCall(ref method_def, ref arguments, _) => {
let methodname = method_def.ident.name.as_str();
debug!("method call ast name {}", methodname);
// arguments[0] is receiver(e.g. self)
let objexpr = &arguments[0];
self.visit_expr(objexpr);
let result = self.result.take();
let get_method_output_ty = |contextm: Match| {
let matching_methods = nameres::search_for_fields_and_methods(
contextm.clone(),
&methodname,
core::SearchType::ExactMatch,
true,
self.session,
);
matching_methods
.into_iter()
.filter_map(|method| {
let ty = typeinf::get_return_type_of_function(
&method,
&contextm,
self.session,
)?;
path_to_match_including_generics(
ty,
contextm.to_generics(),
self.session,
)
})
.nth(0)
};
self.result = result.and_then(|ty| {
ty.resolve_as_field_match(self.session)
.and_then(get_method_output_ty)
});
}
ExprKind::Field(ref subexpression, spannedident) => {
let fieldname = spannedident.name.to_string();
debug!("exprfield {}", fieldname);
self.visit_expr(subexpression);
let result = self.result.take();
let match_to_field_ty = |structm: Match| {
typeinf::get_struct_field_type(&fieldname, &structm, self.session).and_then(
|fieldtypepath| {
find_type_match_including_generics(
fieldtypepath,
&structm.filepath,
structm.point,
&structm,
self.session,
)
},
)
};
self.result = result.and_then(|ty| {
ty.resolve_as_field_match(self.session)
.and_then(match_to_field_ty)
});
}
ExprKind::Tup(ref exprs) => {
let mut v = Vec::new();
for expr in exprs {
self.visit_expr(expr);
v.push(self.result.take());
}
self.result = Some(Ty::Tuple(v));
}
ExprKind::Lit(ref lit) => self.result = Ty::from_lit(lit),
ExprKind::Try(ref expr) => {
self.visit_expr(&expr);
debug!("ExprKind::Try result: {:?} expr: {:?}", self.result, expr);
self.result = if let Some(&Ty::Match(ref m)) = self.result.as_ref() {
// HACK for speed up (kngwyu)
// Yeah there're many corner cases but it'll work well in most cases
if m.matchstr == "Result" || m.matchstr == "Option" {
debug!("Option or Result: {:?}", m);
m.resolved_generics().next().map(|x| x.to_owned())
} else {
debug!("Unable to desugar Try expression; type was {:?}", m);
None
}
} else {
None
};
}
ExprKind::Match(_, ref arms) => {
debug!("match expr");
for arm in arms {
self.visit_expr(&arm.body);
// All match arms need to return the same result, so if we found a result
// we can end the search.
if self.result.is_some() {
break;
}
}
}
ExprKind::If(_, ref block, ref else_block) => {
debug!("if/iflet expr");
if let Some(stmt) = block.stmts.last() {
visit::walk_stmt(self, stmt);
}
if self.result.is_some() {
return;
}
// if the block does not resolve to a type, try the else block
if let Some(expr) = else_block {
self.visit_expr(expr);
}
}
ExprKind::Block(ref block, ref _label) => {
debug!("block expr");
if let Some(stmt) = block.stmts.last() {
visit::walk_stmt(self, stmt);
}
}
ExprKind::Index(ref body, ref _index) => {
self.visit_expr(body);
// TODO(kngwyu) now we don't have support for literal so don't parse index
// but in the future, we should handle index's type
self.result = self
.result
.take()
.and_then(|ty| typeinf::get_type_of_indexed_value(ty, self.session));
}
ExprKind::Array(ref exprs) => {
for expr in exprs {
self.visit_expr(expr);
if self.result.is_some() {
self.result = self
.result
.take()
.map(|ty| Ty::Array(Box::new(ty), format!("{}", exprs.len())));
break;
}
}
if self.result.is_none() {
self.result = Some(Ty::Array(Box::new(Ty::Unsupported), String::new()));
}
}
ExprKind::MacCall(ref m) => {
if let Some(name) = m.path.segments.last().map(|seg| seg.ident) {
// use some ad-hoc rules
if name.as_str() == "vec" {
let path = RacerPath::from_iter(
true,
["std", "vec", "Vec"].iter().map(|s| s.to_string()),
);
self.result = find_type_match(
&path,
&self.scope.filepath,
self.scope.point,
self.session,
)
.map(Ty::Match);
}
}
}
ExprKind::Binary(bin, ref left, ref right) => {
self.visit_expr(left);
let type_match = match self.result.take() {
Some(Ty::Match(m)) => m,
Some(Ty::PathSearch(ps)) => match ps.resolve_as_match(self.session) {
Some(m) => m,
_ => {
return;
}
},
_ => {
return;
}
};
self.visit_expr(right);
let right_expr_type = match self.result.take() {
Some(Ty::Match(m)) => Some(m.matchstr),
Some(Ty::PathSearch(ps)) => {
ps.resolve_as_match(self.session).map(|m| m.matchstr)
}
_ => None,
};
self.result = nameres::resolve_binary_expr_type(
&type_match,
bin.node,
right_expr_type.as_ref().map(|s| s.as_str()),
self.session,
);
}
_ => {
debug!("- Could not match expr node type: {:?}", expr.kind);
}
};
}
/// Just do nothing if we see a macro, but also prevent the panic! in the default impl.
fn visit_mac_call(&mut self, _mac: &ast::MacCall) {}
}
// gets generics info from the context match
fn path_to_match_including_generics(
mut ty: Ty,
generics: Option<&GenericsArgs>,
session: &Session<'_>,
) -> Option<Ty> {
if let Some(gen) = generics {
ty = ty.replace_by_generics(gen);
}
match ty {
Ty::PathSearch(paths) => {
let fieldtypepath = &paths.path;
find_type_match(&fieldtypepath, &paths.filepath, paths.point, session).map(Ty::Match)
}
_ => Some(ty),
}
}
fn find_type_match_including_generics(
fieldtype: Ty,
filepath: &Path,
pos: BytePos,
structm: &Match,
session: &Session<'_>,
) -> Option<Ty> {
assert_eq!(&structm.filepath, filepath);
let fieldtypepath = match fieldtype {
Ty::PathSearch(paths) => paths.path,
Ty::RefPtr(ty, _) => match ty.dereference() {
Ty::PathSearch(paths) => paths.path,
Ty::Match(m) => return Some(Ty::Match(m)),
_ => return None,
},
// already resolved
Ty::Match(m) => return Some(Ty::Match(m)),
_ => {
return None;
}
};
let generics = match &structm.mtype {
MatchType::Struct(gen) => gen,
_ => return None,
};
if fieldtypepath.segments.len() == 1 {
// could be a generic arg! - try and resolve it
if let Some((_, param)) = generics.search_param_by_path(&fieldtypepath) {
if let Some(res) = param.resolved() {
return Some(res.to_owned());
}
let mut m = param.to_owned().into_match();
m.local = structm.local;
return Some(Ty::Match(m));
}
}
find_type_match(&fieldtypepath, filepath, pos, session).map(Ty::Match)
}
struct StructVisitor {
pub scope: Scope,
pub fields: Vec<(String, ByteRange, Option<Ty>)>,
}
impl<'ast> visit::Visitor<'ast> for StructVisitor {
fn visit_variant_data(&mut self, struct_definition: &ast::VariantData) {
for field in struct_definition.fields() {
let ty = Ty::from_ast(&field.ty, &self.scope);
let name = match field.ident {
Some(ref ident) => ident.to_string(),
// name unnamed field by its ordinal, since self.0 works
None => format!("{}", self.fields.len()),
};
self.fields.push((name, field.span.into(), ty));
}
}
}
#[derive(Debug)]
pub struct TypeVisitor<'s> {
pub name: Option<String>,
pub type_: Option<Ty>,
scope: &'s Scope,
}
impl<'ast, 's> visit::Visitor<'ast> for TypeVisitor<'s> {
fn visit_item(&mut self, item: &ast::Item) {
if let ItemKind::TyAlias(ref ty_kind) = item.kind {
if let Some(ref ty) = ty_kind.3 {
self.name = Some(item.ident.name.to_string());
self.type_ = Ty::from_ast(&ty, self.scope);
debug!("typevisitor type is {:?}", self.type_);
}
}
}
}
pub struct TraitVisitor {
pub name: Option<String>,
}
impl<'ast> visit::Visitor<'ast> for TraitVisitor {
fn visit_item(&mut self, item: &ast::Item) {
if let ItemKind::Trait(..) = item.kind {
self.name = Some(item.ident.name.to_string());
}
}
}
#[derive(Debug)]
pub struct ImplVisitor<'p> {
pub result: Option<ImplHeader>,
filepath: &'p Path,
offset: BytePos,
block_start: BytePos, // the point { appears
local: bool,
}
impl<'p> ImplVisitor<'p> {
fn new(filepath: &'p Path, offset: BytePos, local: bool, block_start: BytePos) -> Self {
ImplVisitor {
result: None,
filepath,
offset,
block_start,
local,
}
}
}
impl<'ast, 'p> visit::Visitor<'ast> for ImplVisitor<'p> {
fn visit_item(&mut self, item: &ast::Item) {
if let ItemKind::Impl(ref impl_kind) = item.kind {
let ast::ImplKind {
ref generics,
ref of_trait,
ref self_ty,
..
} = **impl_kind;
let impl_start = self.offset + get_span_start(item.span).into();
self.result = ImplHeader::new(
generics,
self.filepath,
of_trait,
self_ty,
self.offset,
self.local,
impl_start,
self.block_start,
);
}
}
}
pub struct ExternCrateVisitor {
pub name: Option<String>,
pub realname: Option<String>,
}
impl<'ast> visit::Visitor<'ast> for ExternCrateVisitor {
fn visit_item(&mut self, item: &ast::Item) {
if let ItemKind::ExternCrate(ref optional_s) = item.kind {
self.name = Some(item.ident.name.to_string());
if let Some(ref istr) = *optional_s {
self.realname = Some(istr.to_string());
}
}
}
fn visit_mac_call(&mut self, _mac: &ast::MacCall) {}
}
#[derive(Debug)]
struct GenericsVisitor<P> {
result: GenericsArgs,
filepath: P,
}
impl<'ast, P: AsRef<Path>> visit::Visitor<'ast> for GenericsVisitor<P> {
fn visit_generics(&mut self, g: &ast::Generics) {
let path = &self.filepath;
if !self.result.0.is_empty() {
warn!("[visit_generics] called for multiple generics!");
}
self.result.extend(GenericsArgs::from_generics(g, path, 0));
}
}
pub struct EnumVisitor {
pub name: String,