Skip to content
Navigation Menu
{{ message }}
forked from microsoft/TypeScript
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathbinder.ts
More file actions
1059 lines (935 loc) · 55.9 KB
/
Copy pathbinder.ts
File metadata and controls
1059 lines (935 loc) · 55.9 KB
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
/// <reference path="parser.ts"/>
/* @internal */
namespace ts {
export let bindTime = 0;
export const enum ModuleInstanceState {
NonInstantiated = 0,
Instantiated = 1,
ConstEnumOnly = 2
}
export function getModuleInstanceState(node: Node): ModuleInstanceState {
// A module is uninstantiated if it contains only
// 1. interface declarations, type alias declarations
if (node.kind === SyntaxKind.InterfaceDeclaration || node.kind === SyntaxKind.TypeAliasDeclaration) {
return ModuleInstanceState.NonInstantiated;
}
// 2. const enum declarations
else if (isConstEnumDeclaration(node)) {
return ModuleInstanceState.ConstEnumOnly;
}
// 3. non-exported import declarations
else if ((node.kind === SyntaxKind.ImportDeclaration || node.kind === SyntaxKind.ImportEqualsDeclaration) && !(node.flags & NodeFlags.Export)) {
return ModuleInstanceState.NonInstantiated;
}
// 4. other uninstantiated module declarations.
else if (node.kind === SyntaxKind.ModuleBlock) {
let state = ModuleInstanceState.NonInstantiated;
forEachChild(node, n => {
switch (getModuleInstanceState(n)) {
case ModuleInstanceState.NonInstantiated:
// child is non-instantiated - continue searching
return false;
case ModuleInstanceState.ConstEnumOnly:
// child is const enum only - record state and continue searching
state = ModuleInstanceState.ConstEnumOnly;
return false;
case ModuleInstanceState.Instantiated:
// child is instantiated - record state and stop
state = ModuleInstanceState.Instantiated;
return true;
}
});
return state;
}
else if (node.kind === SyntaxKind.ModuleDeclaration) {
return getModuleInstanceState((<ModuleDeclaration>node).body);
}
else {
return ModuleInstanceState.Instantiated;
}
}
const enum ContainerFlags {
// The current node is not a container, and no container manipulation should happen before
// recursing into it.
None = 0,
// The current node is a container. It should be set as the current container (and block-
// container) before recursing into it. The current node does not have locals. Examples:
//
// Classes, ObjectLiterals, TypeLiterals, Interfaces...
IsContainer = 1 << 0,
// The current node is a block-scoped-container. It should be set as the current block-
// container before recursing into it. Examples:
//
// Blocks (when not parented by functions), Catch clauses, For/For-in/For-of statements...
IsBlockScopedContainer = 1 << 1,
HasLocals = 1 << 2,
// If the current node is a container that also container that also contains locals. Examples:
//
// Functions, Methods, Modules, Source-files.
IsContainerWithLocals = IsContainer | HasLocals
}
export function bindSourceFile(file: SourceFile) {
let start = new Date().getTime();
bindSourceFileWorker(file);
bindTime += new Date().getTime() - start;
}
function bindSourceFileWorker(file: SourceFile) {
let parent: Node;
let container: Node;
let blockScopeContainer: Node;
let lastContainer: Node;
// If this file is an external module, then it is automatically in strict-mode according to
// ES6. If it is not an external module, then we'll determine if it is in strict mode or
// not depending on if we see "use strict" in certain places (or if we hit a class/namespace).
let inStrictMode = !!file.externalModuleIndicator;
let symbolCount = 0;
let Symbol = objectAllocator.getSymbolConstructor();
let classifiableNames: Map<string> = {};
if (!file.locals) {
bind(file);
file.symbolCount = symbolCount;
file.classifiableNames = classifiableNames;
}
return;
function createSymbol(flags: SymbolFlags, name: string): Symbol {
symbolCount++;
return new Symbol(flags, name);
}
function addDeclarationToSymbol(symbol: Symbol, node: Declaration, symbolFlags: SymbolFlags) {
symbol.flags |= symbolFlags;
node.symbol = symbol;
if (!symbol.declarations) {
symbol.declarations = [];
}
symbol.declarations.push(node);
if (symbolFlags & SymbolFlags.HasExports && !symbol.exports) {
symbol.exports = {};
}
if (symbolFlags & SymbolFlags.HasMembers && !symbol.members) {
symbol.members = {};
}
if (symbolFlags & SymbolFlags.Value && !symbol.valueDeclaration) {
symbol.valueDeclaration = node;
}
}
// Should not be called on a declaration with a computed property name,
// unless it is a well known Symbol.
function getDeclarationName(node: Declaration): string {
if (node.name) {
if (node.kind === SyntaxKind.ModuleDeclaration && node.name.kind === SyntaxKind.StringLiteral) {
return '"' + (<LiteralExpression>node.name).text + '"';
}
if (node.name.kind === SyntaxKind.ComputedPropertyName) {
let nameExpression = (<ComputedPropertyName>node.name).expression;
Debug.assert(isWellKnownSymbolSyntactically(nameExpression));
return getPropertyNameForKnownSymbolName((<PropertyAccessExpression>nameExpression).name.text);
}
return (<Identifier | LiteralExpression>node.name).text;
}
switch (node.kind) {
case SyntaxKind.Constructor:
return "__constructor";
case SyntaxKind.FunctionType:
case SyntaxKind.CallSignature:
return "__call";
case SyntaxKind.ConstructorType:
case SyntaxKind.ConstructSignature:
return "__new";
case SyntaxKind.IndexSignature:
return "__index";
case SyntaxKind.ExportDeclaration:
return "__export";
case SyntaxKind.ExportAssignment:
return (<ExportAssignment>node).isExportEquals ? "export=" : "default";
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ClassDeclaration:
return node.flags & NodeFlags.Default ? "default" : undefined;
}
}
function getDisplayName(node: Declaration): string {
return node.name ? declarationNameToString(node.name) : getDeclarationName(node);
}
/**
* Declares a Symbol for the node and adds it to symbols. Reports errors for conflicting identifier names.
* @param symbolTable - The symbol table which node will be added to.
* @param parent - node's parent declaration.
* @param node - The declaration to be added to the symbol table
* @param includes - The SymbolFlags that node has in addition to its declaration type (eg: export, ambient, etc.)
* @param excludes - The flags which node cannot be declared alongside in a symbol table. Used to report forbidden declarations.
*/
function declareSymbol(symbolTable: SymbolTable, parent: Symbol, node: Declaration, includes: SymbolFlags, excludes: SymbolFlags): Symbol {
Debug.assert(!hasDynamicName(node));
// The exported symbol for an export default function/class node is always named "default"
let name = node.flags & NodeFlags.Default && parent ? "default" : getDeclarationName(node);
let symbol: Symbol;
if (name !== undefined) {
// Check and see if the symbol table already has a symbol with this name. If not,
// create a new symbol with this name and add it to the table. Note that we don't
// give the new symbol any flags *yet*. This ensures that it will not conflict
// with the 'excludes' flags we pass in.
//
// If we do get an existing symbol, see if it conflicts with the new symbol we're
// creating. For example, a 'var' symbol and a 'class' symbol will conflict within
// the same symbol table. If we have a conflict, report the issue on each
// declaration we have for this symbol, and then create a new symbol for this
// declaration.
//
// If we created a new symbol, either because we didn't have a symbol with this name
// in the symbol table, or we conflicted with an existing symbol, then just add this
// node as the sole declaration of the new symbol.
//
// Otherwise, we'll be merging into a compatible existing symbol (for example when
// you have multiple 'vars' with the same name in the same container). In this case
// just add this node into the declarations list of the symbol.
symbol = hasProperty(symbolTable, name)
? symbolTable[name]
: (symbolTable[name] = createSymbol(SymbolFlags.None, name));
if (name && (includes & SymbolFlags.Classifiable)) {
classifiableNames[name] = name;
}
if (symbol.flags & excludes) {
if (node.name) {
node.name.parent = node;
}
// Report errors every position with duplicate declaration
// Report errors on previous encountered declarations
let message = symbol.flags & SymbolFlags.BlockScopedVariable
? Diagnostics.Cannot_redeclare_block_scoped_variable_0
: Diagnostics.Duplicate_identifier_0;
forEach(symbol.declarations, declaration => {
file.bindDiagnostics.push(createDiagnosticForNode(declaration.name || declaration, message, getDisplayName(declaration)));
});
file.bindDiagnostics.push(createDiagnosticForNode(node.name || node, message, getDisplayName(node)));
symbol = createSymbol(SymbolFlags.None, name);
}
}
else {
symbol = createSymbol(SymbolFlags.None, "__missing");
}
addDeclarationToSymbol(symbol, node, includes);
symbol.parent = parent;
return symbol;
}
function declareModuleMember(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags): Symbol {
let hasExportModifier = getCombinedNodeFlags(node) & NodeFlags.Export;
if (symbolFlags & SymbolFlags.Alias) {
if (node.kind === SyntaxKind.ExportSpecifier || (node.kind === SyntaxKind.ImportEqualsDeclaration && hasExportModifier)) {
return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
}
else {
return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
else {
// Exported module members are given 2 symbols: A local symbol that is classified with an ExportValue,
// ExportType, or ExportContainer flag, and an associated export symbol with all the correct flags set
// on it. There are 2 main reasons:
//
// 1. We treat locals and exports of the same name as mutually exclusive within a container.
// That means the binder will issue a Duplicate Identifier error if you mix locals and exports
// with the same name in the same container.
// TODO: Make this a more specific error and decouple it from the exclusion logic.
// 2. When we checkIdentifier in the checker, we set its resolved symbol to the local symbol,
// but return the export symbol (by calling getExportSymbolOfValueSymbolIfExported). That way
// when the emitter comes back to it, it knows not to qualify the name if it was found in a containing scope.
if (hasExportModifier || container.flags & NodeFlags.ExportContext) {
let exportKind =
(symbolFlags & SymbolFlags.Value ? SymbolFlags.ExportValue : 0) |
(symbolFlags & SymbolFlags.Type ? SymbolFlags.ExportType : 0) |
(symbolFlags & SymbolFlags.Namespace ? SymbolFlags.ExportNamespace : 0);
let local = declareSymbol(container.locals, undefined, node, exportKind, symbolExcludes);
local.exportSymbol = declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
node.localSymbol = local;
return local;
}
else {
return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
}
// All container nodes are kept on a linked list in declaration order. This list is used by
// the getLocalNameOfContainer function in the type checker to validate that the local name
// used for a container is unique.
function bindChildren(node: Node) {
// Before we recurse into a node's chilren, we first save the existing parent, container
// and block-container. Then after we pop out of processing the children, we restore
// these saved values.
let saveParent = parent;
let saveContainer = container;
let savedBlockScopeContainer = blockScopeContainer;
// This node will now be set as the parent of all of its children as we recurse into them.
parent = node;
// Depending on what kind of node this is, we may have to adjust the current container
// and block-container. If the current node is a container, then it is automatically
// considered the current block-container as well. Also, for containers that we know
// may contain locals, we proactively initialize the .locals field. We do this because
// it's highly likely that the .locals will be needed to place some child in (for example,
// a parameter, or variable declaration).
//
// However, we do not proactively create the .locals for block-containers because it's
// totally normal and common for block-containers to never actually have a block-scoped
// variable in them. We don't want to end up allocating an object for every 'block' we
// run into when most of them won't be necessary.
//
// Finally, if this is a block-container, then we clear out any existing .locals object
// it may contain within it. This happens in incremental scenarios. Because we can be
// reusing a node from a previous compilation, that node may have had 'locals' created
// for it. We must clear this so we don't accidently move any stale data forward from
// a previous compilation.
let containerFlags = getContainerFlags(node);
if (containerFlags & ContainerFlags.IsContainer) {
container = blockScopeContainer = node;
if (containerFlags & ContainerFlags.HasLocals) {
container.locals = {};
}
addToContainerChain(container);
}
else if (containerFlags & ContainerFlags.IsBlockScopedContainer) {
blockScopeContainer = node;
blockScopeContainer.locals = undefined;
}
forEachChild(node, bind);
container = saveContainer;
parent = saveParent;
blockScopeContainer = savedBlockScopeContainer;
}
function getContainerFlags(node: Node): ContainerFlags {
switch (node.kind) {
case SyntaxKind.ClassExpression:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.TypeLiteral:
case SyntaxKind.ObjectLiteralExpression:
return ContainerFlags.IsContainer;
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.SourceFile:
case SyntaxKind.TypeAliasDeclaration:
return ContainerFlags.IsContainerWithLocals;
case SyntaxKind.CatchClause:
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
case SyntaxKind.CaseBlock:
return ContainerFlags.IsBlockScopedContainer;
case SyntaxKind.Block:
// do not treat blocks directly inside a function as a block-scoped-container.
// Locals that reside in this block should go to the function locals. Othewise 'x'
// would not appear to be a redeclaration of a block scoped local in the following
// example:
//
// function foo() {
// var x;
// let x;
// }
//
// If we placed 'var x' into the function locals and 'let x' into the locals of
// the block, then there would be no collision.
//
// By not creating a new block-scoped-container here, we ensure that both 'var x'
// and 'let x' go into the Function-container's locals, and we do get a collision
// conflict.
return isFunctionLike(node.parent) ? ContainerFlags.None : ContainerFlags.IsBlockScopedContainer;
}
return ContainerFlags.None;
}
function addToContainerChain(next: Node) {
if (lastContainer) {
lastContainer.nextContainer = next;
}
lastContainer = next;
}
function declareSymbolAndAddToSymbolTable(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags): void {
// Just call this directly so that the return type of this function stays "void".
declareSymbolAndAddToSymbolTableWorker(node, symbolFlags, symbolExcludes);
}
function declareSymbolAndAddToSymbolTableWorker(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags): Symbol {
switch (container.kind) {
// Modules, source files, and classes need specialized handling for how their
// members are declared (for example, a member of a class will go into a specific
// symbol table depending on if it is static or not). We defer to specialized
// handlers to take care of declaring these child members.
case SyntaxKind.ModuleDeclaration:
return declareModuleMember(node, symbolFlags, symbolExcludes);
case SyntaxKind.SourceFile:
return declareSourceFileMember(node, symbolFlags, symbolExcludes);
case SyntaxKind.ClassExpression:
case SyntaxKind.ClassDeclaration:
return declareClassMember(node, symbolFlags, symbolExcludes);
case SyntaxKind.EnumDeclaration:
return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
case SyntaxKind.TypeLiteral:
case SyntaxKind.ObjectLiteralExpression:
case SyntaxKind.InterfaceDeclaration:
// Interface/Object-types always have their children added to the 'members' of
// their container. They are only accessible through an instance of their
// container, and are never in scope otherwise (even inside the body of the
// object / type / interface declaring them). An exception is type parameters,
// which are in scope without qualification (similar to 'locals').
return declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
case SyntaxKind.TypeAliasDeclaration:
// All the children of these container types are never visible through another
// symbol (i.e. through another symbol's 'exports' or 'members'). Instead,
// they're only accessed 'lexically' (i.e. from code that exists underneath
// their container in the tree. To accomplish this, we simply add their declared
// symbol to the 'locals' of the container. These symbols can then be found as
// the type checker walks up the containers, checking them for matching names.
return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
function declareClassMember(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags) {
return node.flags & NodeFlags.Static
? declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes)
: declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
}
function declareSourceFileMember(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags) {
return isExternalModule(file)
? declareModuleMember(node, symbolFlags, symbolExcludes)
: declareSymbol(file.locals, undefined, node, symbolFlags, symbolExcludes);
}
function isAmbientContext(node: Node): boolean {
while (node) {
if (node.flags & NodeFlags.Ambient) {
return true;
}
node = node.parent;
}
return false;
}
function hasExportDeclarations(node: ModuleDeclaration | SourceFile): boolean {
var body = node.kind === SyntaxKind.SourceFile ? node : (<ModuleDeclaration>node).body;
if (body.kind === SyntaxKind.SourceFile || body.kind === SyntaxKind.ModuleBlock) {
for (let stat of (<Block>body).statements) {
if (stat.kind === SyntaxKind.ExportDeclaration || stat.kind === SyntaxKind.ExportAssignment) {
return true;
}
}
}
return false;
}
function setExportContextFlag(node: ModuleDeclaration | SourceFile) {
// A declaration source file or ambient module declaration that contains no export declarations (but possibly regular
// declarations with export modifiers) is an export context in which declarations are implicitly exported.
if (isAmbientContext(node) && !hasExportDeclarations(node)) {
node.flags |= NodeFlags.ExportContext;
}
else {
node.flags &= ~NodeFlags.ExportContext;
}
}
function bindModuleDeclaration(node: ModuleDeclaration) {
setExportContextFlag(node);
if (node.name.kind === SyntaxKind.StringLiteral) {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.ValueModule, SymbolFlags.ValueModuleExcludes);
}
else {
let state = getModuleInstanceState(node);
if (state === ModuleInstanceState.NonInstantiated) {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.NamespaceModule, SymbolFlags.NamespaceModuleExcludes);
}
else {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.ValueModule, SymbolFlags.ValueModuleExcludes);
let currentModuleIsConstEnumOnly = state === ModuleInstanceState.ConstEnumOnly;
if (node.symbol.constEnumOnlyModule === undefined) {
// non-merged case - use the current state
node.symbol.constEnumOnlyModule = currentModuleIsConstEnumOnly;
}
else {
// merged case: module is const enum only if all its pieces are non-instantiated or const enum
node.symbol.constEnumOnlyModule = node.symbol.constEnumOnlyModule && currentModuleIsConstEnumOnly;
}
}
}
}
function bindFunctionOrConstructorType(node: SignatureDeclaration) {
// For a given function symbol "<...>(...) => T" we want to generate a symbol identical
// to the one we would get for: { <...>(...): T }
//
// We do that by making an anonymous type literal symbol, and then setting the function
// symbol as its sole member. To the rest of the system, this symbol will be indistinguishable
// from an actual type literal symbol you would have gotten had you used the long form.
let symbol = createSymbol(SymbolFlags.Signature, getDeclarationName(node));
addDeclarationToSymbol(symbol, node, SymbolFlags.Signature);
let typeLiteralSymbol = createSymbol(SymbolFlags.TypeLiteral, "__type");
addDeclarationToSymbol(typeLiteralSymbol, node, SymbolFlags.TypeLiteral);
typeLiteralSymbol.members = { [symbol.name]: symbol };
}
function bindObjectLiteralExpression(node: ObjectLiteralExpression) {
const enum ElementKind {
Property = 1,
Accessor = 2
}
if (inStrictMode) {
let seen: Map<ElementKind> = {};
for (let prop of node.properties) {
if (prop.name.kind !== SyntaxKind.Identifier) {
continue;
}
let identifier = <Identifier>prop.name;
// ECMA-262 11.1.5 Object Initialiser
// If previous is not undefined then throw a SyntaxError exception if any of the following conditions are true
// a.This production is contained in strict code and IsDataDescriptor(previous) is true and
// IsDataDescriptor(propId.descriptor) is true.
// b.IsDataDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true.
// c.IsAccessorDescriptor(previous) is true and IsDataDescriptor(propId.descriptor) is true.
// d.IsAccessorDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true
// and either both previous and propId.descriptor have[[Get]] fields or both previous and propId.descriptor have[[Set]] fields
let currentKind = prop.kind === SyntaxKind.PropertyAssignment || prop.kind === SyntaxKind.ShorthandPropertyAssignment || prop.kind === SyntaxKind.MethodDeclaration
? ElementKind.Property
: ElementKind.Accessor;
let existingKind = seen[identifier.text];
if (!existingKind) {
seen[identifier.text] = currentKind;
continue;
}
if (currentKind === ElementKind.Property && existingKind === ElementKind.Property) {
let span = getErrorSpanForNode(file, identifier);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length,
Diagnostics.An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode));
}
}
}
return bindAnonymousDeclaration(node, SymbolFlags.ObjectLiteral, "__object");
}
function bindAnonymousDeclaration(node: Declaration, symbolFlags: SymbolFlags, name: string) {
let symbol = createSymbol(symbolFlags, name);
addDeclarationToSymbol(symbol, node, symbolFlags);
}
function bindBlockScopedDeclaration(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags) {
switch (blockScopeContainer.kind) {
case SyntaxKind.ModuleDeclaration:
declareModuleMember(node, symbolFlags, symbolExcludes);
break;
case SyntaxKind.SourceFile:
if (isExternalModule(<SourceFile>container)) {
declareModuleMember(node, symbolFlags, symbolExcludes);
break;
}
// fall through.
default:
if (!blockScopeContainer.locals) {
blockScopeContainer.locals = {};
addToContainerChain(blockScopeContainer);
}
declareSymbol(blockScopeContainer.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
function bindBlockScopedVariableDeclaration(node: Declaration) {
bindBlockScopedDeclaration(node, SymbolFlags.BlockScopedVariable, SymbolFlags.BlockScopedVariableExcludes);
}
// The binder visits every node in the syntax tree so it is a convenient place to perform a single localized
// check for reserved words used as identifiers in strict mode code.
function checkStrictModeIdentifier(node: Identifier) {
if (inStrictMode &&
node.originalKeywordKind >= SyntaxKind.FirstFutureReservedWord &&
node.originalKeywordKind <= SyntaxKind.LastFutureReservedWord &&
!isIdentifierName(node)) {
// Report error only if there are no parse errors in file
if (!file.parseDiagnostics.length) {
file.bindDiagnostics.push(createDiagnosticForNode(node,
getStrictModeIdentifierMessage(node), declarationNameToString(node)));
}
}
}
function getStrictModeIdentifierMessage(node: Node) {
// Provide specialized messages to help the user understand why we think they're in
// strict mode.
if (getContainingClass(node)) {
return Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode;
}
if (file.externalModuleIndicator) {
return Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode;
}
return Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode;
}
function checkStrictModeBinaryExpression(node: BinaryExpression) {
if (inStrictMode && isLeftHandSideExpression(node.left) && isAssignmentOperator(node.operatorToken.kind)) {
// ECMA 262 (Annex C) The identifier eval or arguments may not appear as the LeftHandSideExpression of an
// Assignment operator(11.13) or of a PostfixExpression(11.3)
checkStrictModeEvalOrArguments(node, <Identifier>node.left);
}
}
function checkStrictModeCatchClause(node: CatchClause) {
// It is a SyntaxError if a TryStatement with a Catch occurs within strict code and the Identifier of the
// Catch production is eval or arguments
if (inStrictMode && node.variableDeclaration) {
checkStrictModeEvalOrArguments(node, node.variableDeclaration.name);
}
}
function checkStrictModeDeleteExpression(node: DeleteExpression) {
// Grammar checking
if (inStrictMode && node.expression.kind === SyntaxKind.Identifier) {
// When a delete operator occurs within strict mode code, a SyntaxError is thrown if its
// UnaryExpression is a direct reference to a variable, function argument, or function name
let span = getErrorSpanForNode(file, node.expression);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length, Diagnostics.delete_cannot_be_called_on_an_identifier_in_strict_mode));
}
}
function isEvalOrArgumentsIdentifier(node: Node): boolean {
return node.kind === SyntaxKind.Identifier &&
((<Identifier>node).text === "eval" || (<Identifier>node).text === "arguments");
}
function checkStrictModeEvalOrArguments(contextNode: Node, name: Node) {
if (name && name.kind === SyntaxKind.Identifier) {
let identifier = <Identifier>name;
if (isEvalOrArgumentsIdentifier(identifier)) {
// We check first if the name is inside class declaration or class expression; if so give explicit message
// otherwise report generic error message.
let span = getErrorSpanForNode(file, name);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length,
getStrictModeEvalOrArgumentsMessage(contextNode), identifier.text));
}
}
}
function getStrictModeEvalOrArgumentsMessage(node: Node) {
// Provide specialized messages to help the user understand why we think they're in
// strict mode.
if (getContainingClass(node)) {
return Diagnostics.Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode;
}
if (file.externalModuleIndicator) {
return Diagnostics.Invalid_use_of_0_Modules_are_automatically_in_strict_mode;
}
return Diagnostics.Invalid_use_of_0_in_strict_mode;
}
function checkStrictModeFunctionName(node: FunctionLikeDeclaration) {
if (inStrictMode) {
// It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a strict mode FunctionDeclaration or FunctionExpression (13.1))
checkStrictModeEvalOrArguments(node, node.name);
}
}
function checkStrictModeNumericLiteral(node: LiteralExpression) {
if (inStrictMode && node.flags & NodeFlags.OctalLiteral) {
file.bindDiagnostics.push(createDiagnosticForNode(node, Diagnostics.Octal_literals_are_not_allowed_in_strict_mode));
}
}
function checkStrictModePostfixUnaryExpression(node: PostfixUnaryExpression) {
// Grammar checking
// The identifier eval or arguments may not appear as the LeftHandSideExpression of an
// Assignment operator(11.13) or of a PostfixExpression(11.3) or as the UnaryExpression
// operated upon by a Prefix Increment(11.4.4) or a Prefix Decrement(11.4.5) operator.
if (inStrictMode) {
checkStrictModeEvalOrArguments(node, <Identifier>node.operand);
}
}
function checkStrictModePrefixUnaryExpression(node: PrefixUnaryExpression) {
// Grammar checking
if (inStrictMode) {
if (node.operator === SyntaxKind.PlusPlusToken || node.operator === SyntaxKind.MinusMinusToken) {
checkStrictModeEvalOrArguments(node, <Identifier>node.operand);
}
}
}
function checkStrictModeWithStatement(node: WithStatement) {
// Grammar checking for withStatement
if (inStrictMode) {
grammarErrorOnFirstToken(node, Diagnostics.with_statements_are_not_allowed_in_strict_mode);
}
}
function grammarErrorOnFirstToken(node: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any) {
let span = getSpanOfTokenAtPosition(file, node.pos);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2));
}
function getDestructuringParameterName(node: Declaration) {
return "__" + indexOf((<SignatureDeclaration>node.parent).parameters, node);
}
function bind(node: Node) {
node.parent = parent;
var savedInStrictMode = inStrictMode;
if (!savedInStrictMode) {
updateStrictMode(node);
}
// First we bind declaration nodes to a symbol if possible. We'll both create a symbol
// and then potentially add the symbol to an appropriate symbol table. Possible
// destination symbol tables are:
//
// 1) The 'exports' table of the current container's symbol.
// 2) The 'members' table of the current container's symbol.
// 3) The 'locals' table of the current container.
//
// However, not all symbols will end up in any of these tables. 'Anonymous' symbols
// (like TypeLiterals for example) will not be put in any table.
bindWorker(node);
// Then we recurse into the children of the node to bind them as well. For certain
// symbols we do specialized work when we recurse. For example, we'll keep track of
// the current 'container' node when it changes. This helps us know which symbol table
// a local should go into for example.
bindChildren(node);
inStrictMode = savedInStrictMode;
}
function updateStrictMode(node: Node) {
switch (node.kind) {
case SyntaxKind.SourceFile:
case SyntaxKind.ModuleBlock:
updateStrictModeStatementList((<SourceFile | ModuleBlock>node).statements);
return;
case SyntaxKind.Block:
if (isFunctionLike(node.parent)) {
updateStrictModeStatementList((<Block>node).statements);
}
return;
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
// All classes are automatically in strict mode in ES6.
inStrictMode = true;
return;
}
}
function updateStrictModeStatementList(statements: NodeArray<Statement>) {
for (let statement of statements) {
if (!isPrologueDirective(statement)) {
return;
}
if (isUseStrictPrologueDirective(<ExpressionStatement>statement)) {
inStrictMode = true;
return;
}
}
}
/// Should be called only on prologue directives (isPrologueDirective(node) should be true)
function isUseStrictPrologueDirective(node: ExpressionStatement): boolean {
let nodeText = getTextOfNodeFromSourceText(file.text, node.expression);
// Note: the node text must be exactly "use strict" or 'use strict'. It is not ok for the
// string to contain unicode escapes (as per ES5).
return nodeText === '"use strict"' || nodeText === "'use strict'";
}
function bindWorker(node: Node) {
switch (node.kind) {
case SyntaxKind.Identifier:
return checkStrictModeIdentifier(<Identifier>node);
case SyntaxKind.BinaryExpression:
return checkStrictModeBinaryExpression(<BinaryExpression>node);
case SyntaxKind.CatchClause:
return checkStrictModeCatchClause(<CatchClause>node);
case SyntaxKind.DeleteExpression:
return checkStrictModeDeleteExpression(<DeleteExpression>node);
case SyntaxKind.NumericLiteral:
return checkStrictModeNumericLiteral(<LiteralExpression>node);
case SyntaxKind.PostfixUnaryExpression:
return checkStrictModePostfixUnaryExpression(<PostfixUnaryExpression>node);
case SyntaxKind.PrefixUnaryExpression:
return checkStrictModePrefixUnaryExpression(<PrefixUnaryExpression>node);
case SyntaxKind.WithStatement:
return checkStrictModeWithStatement(<WithStatement>node);
case SyntaxKind.TypeParameter:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.TypeParameter, SymbolFlags.TypeParameterExcludes);
case SyntaxKind.Parameter:
return bindParameter(<ParameterDeclaration>node);
case SyntaxKind.VariableDeclaration:
case SyntaxKind.BindingElement:
return bindVariableDeclarationOrBindingElement(<VariableDeclaration | BindingElement>node);
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.Property | ((<PropertyDeclaration>node).questionToken ? SymbolFlags.Optional : SymbolFlags.None), SymbolFlags.PropertyExcludes);
case SyntaxKind.PropertyAssignment:
case SyntaxKind.ShorthandPropertyAssignment:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.Property, SymbolFlags.PropertyExcludes);
case SyntaxKind.EnumMember:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.EnumMember, SymbolFlags.EnumMemberExcludes);
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Signature, SymbolFlags.None);
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
// If this is an ObjectLiteralExpression method, then it sits in the same space
// as other properties in the object literal. So we use SymbolFlags.PropertyExcludes
// so that it will conflict with any other object literal members with the same
// name.
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.Method | ((<MethodDeclaration>node).questionToken ? SymbolFlags.Optional : SymbolFlags.None),
isObjectLiteralMethod(node) ? SymbolFlags.PropertyExcludes : SymbolFlags.MethodExcludes);
case SyntaxKind.FunctionDeclaration:
checkStrictModeFunctionName(<FunctionDeclaration>node);
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Function, SymbolFlags.FunctionExcludes);
case SyntaxKind.Constructor:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Constructor, /*symbolExcludes:*/ SymbolFlags.None);
case SyntaxKind.GetAccessor:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.GetAccessor, SymbolFlags.GetAccessorExcludes);
case SyntaxKind.SetAccessor:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.SetAccessor, SymbolFlags.SetAccessorExcludes);
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
return bindFunctionOrConstructorType(<SignatureDeclaration>node);
case SyntaxKind.TypeLiteral:
return bindAnonymousDeclaration(<TypeLiteralNode>node, SymbolFlags.TypeLiteral, "__type");
case SyntaxKind.ObjectLiteralExpression:
return bindObjectLiteralExpression(<ObjectLiteralExpression>node);
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
checkStrictModeFunctionName(<FunctionExpression>node);
let bindingName = (<FunctionExpression>node).name ? (<FunctionExpression>node).name.text : "__function";
return bindAnonymousDeclaration(<FunctionExpression>node, SymbolFlags.Function, bindingName);
case SyntaxKind.ClassExpression:
case SyntaxKind.ClassDeclaration:
return bindClassLikeDeclaration(<ClassLikeDeclaration>node);
case SyntaxKind.InterfaceDeclaration:
return bindBlockScopedDeclaration(<Declaration>node, SymbolFlags.Interface, SymbolFlags.InterfaceExcludes);
case SyntaxKind.TypeAliasDeclaration:
return bindBlockScopedDeclaration(<Declaration>node, SymbolFlags.TypeAlias, SymbolFlags.TypeAliasExcludes);
case SyntaxKind.EnumDeclaration:
return bindEnumDeclaration(<EnumDeclaration>node);
case SyntaxKind.ModuleDeclaration:
return bindModuleDeclaration(<ModuleDeclaration>node);
case SyntaxKind.ImportEqualsDeclaration:
case SyntaxKind.NamespaceImport:
case SyntaxKind.ImportSpecifier:
case SyntaxKind.ExportSpecifier:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Alias, SymbolFlags.AliasExcludes);
case SyntaxKind.ImportClause:
return bindImportClause(<ImportClause>node);
case SyntaxKind.ExportDeclaration:
return bindExportDeclaration(<ExportDeclaration>node);
case SyntaxKind.ExportAssignment:
return bindExportAssignment(<ExportAssignment>node);
case SyntaxKind.SourceFile:
return bindSourceFileIfExternalModule();
}
}
function bindSourceFileIfExternalModule() {
setExportContextFlag(file);
if (isExternalModule(file)) {
bindAnonymousDeclaration(file, SymbolFlags.ValueModule, '"' + removeFileExtension(file.fileName) + '"');
}
}
function bindExportAssignment(node: ExportAssignment) {
if (!container.symbol || !container.symbol.exports) {
// Export assignment in some sort of block construct
bindAnonymousDeclaration(node, SymbolFlags.Alias, getDeclarationName(node));
}
else if (node.expression.kind === SyntaxKind.Identifier) {
// An export default clause with an identifier exports all meanings of that identifier
declareSymbol(container.symbol.exports, container.symbol, node, SymbolFlags.Alias, SymbolFlags.PropertyExcludes | SymbolFlags.AliasExcludes);
}
else {
// An export default clause with an expression exports a value
declareSymbol(container.symbol.exports, container.symbol, node, SymbolFlags.Property, SymbolFlags.PropertyExcludes | SymbolFlags.AliasExcludes);
}
}
function bindExportDeclaration(node: ExportDeclaration) {
if (!container.symbol || !container.symbol.exports) {
// Export * in some sort of block construct
bindAnonymousDeclaration(node, SymbolFlags.ExportStar, getDeclarationName(node));
}
else if (!node.exportClause) {
// All export * declarations are collected in an __export symbol
declareSymbol(container.symbol.exports, container.symbol, node, SymbolFlags.ExportStar, SymbolFlags.None);
}
}
function bindImportClause(node: ImportClause) {
if (node.name) {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.Alias, SymbolFlags.AliasExcludes);
}
}
function bindClassLikeDeclaration(node: ClassLikeDeclaration) {
if (node.kind === SyntaxKind.ClassDeclaration) {
bindBlockScopedDeclaration(node, SymbolFlags.Class, SymbolFlags.ClassExcludes);
}
else {
let bindingName = node.name ? node.name.text : "__class";
bindAnonymousDeclaration(node, SymbolFlags.Class, bindingName);
}
let symbol = node.symbol;
// TypeScript 1.0 spec (April 2014): 8.4
// Every class automatically contains a static property member named 'prototype', the
// type of which is an instantiation of the class type with type Any supplied as a type
// argument for each type parameter. It is an error to explicitly declare a static
// property member with the name 'prototype'.
//
// Note: we check for this here because this class may be merging into a module. The
// module might have an exported variable called 'prototype'. We can't allow that as
// that would clash with the built-in 'prototype' for the class.
let prototypeSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Prototype, "prototype");
if (hasProperty(symbol.exports, prototypeSymbol.name)) {
if (node.name) {
node.name.parent = node;
}
file.bindDiagnostics.push(createDiagnosticForNode(symbol.exports[prototypeSymbol.name].declarations[0],
Diagnostics.Duplicate_identifier_0, prototypeSymbol.name));
}
symbol.exports[prototypeSymbol.name] = prototypeSymbol;
prototypeSymbol.parent = symbol;
}
function bindEnumDeclaration(node: EnumDeclaration) {
return isConst(node)
? bindBlockScopedDeclaration(node, SymbolFlags.ConstEnum, SymbolFlags.ConstEnumExcludes)
: bindBlockScopedDeclaration(node, SymbolFlags.RegularEnum, SymbolFlags.RegularEnumExcludes);
}
You can’t perform that action at this time.