-
Notifications
You must be signed in to change notification settings - Fork 12.8k
/
Copy pathchecker.ts
11428 lines (10348 loc) · 608 KB
/
checker.ts
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="binder.ts"/>
module ts {
var nextSymbolId = 1;
var nextNodeId = 1;
var nextMergeId = 1;
/* @internal */ export var checkTime = 0;
export function createTypeChecker(host: TypeCheckerHost, produceDiagnostics: boolean): TypeChecker {
var Symbol = objectAllocator.getSymbolConstructor();
var Type = objectAllocator.getTypeConstructor();
var Signature = objectAllocator.getSignatureConstructor();
var typeCount = 0;
var emptyArray: any[] = [];
var emptySymbols: SymbolTable = {};
var compilerOptions = host.getCompilerOptions();
var languageVersion = compilerOptions.target || ScriptTarget.ES3;
var emitResolver = createResolver();
var checker: TypeChecker = {
getNodeCount: () => sum(host.getSourceFiles(), "nodeCount"),
getIdentifierCount: () => sum(host.getSourceFiles(), "identifierCount"),
getSymbolCount: () => sum(host.getSourceFiles(), "symbolCount"),
getTypeCount: () => typeCount,
isUndefinedSymbol: symbol => symbol === undefinedSymbol,
isArgumentsSymbol: symbol => symbol === argumentsSymbol,
getDiagnostics,
getGlobalDiagnostics,
getTypeOfSymbolAtLocation,
getDeclaredTypeOfSymbol,
getPropertiesOfType,
getPropertyOfType,
getSignaturesOfType,
getIndexTypeOfType,
getReturnTypeOfSignature,
getSymbolsInScope,
getSymbolAtLocation,
getShorthandAssignmentValueSymbol,
getTypeAtLocation,
typeToString,
getSymbolDisplayBuilder,
symbolToString,
getAugmentedPropertiesOfType,
getRootSymbols,
getContextualType,
getFullyQualifiedName,
getResolvedSignature,
getConstantValue,
isValidPropertyAccess,
getSignatureFromDeclaration,
isImplementationOfOverload,
getAliasedSymbol: resolveImport,
getEmitResolver,
};
var undefinedSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Transient, "undefined");
var argumentsSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Transient, "arguments");
var unknownSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Transient, "unknown");
var resolvingSymbol = createSymbol(SymbolFlags.Transient, "__resolving__");
var anyType = createIntrinsicType(TypeFlags.Any, "any");
var stringType = createIntrinsicType(TypeFlags.String, "string");
var numberType = createIntrinsicType(TypeFlags.Number, "number");
var booleanType = createIntrinsicType(TypeFlags.Boolean, "boolean");
var esSymbolType = createIntrinsicType(TypeFlags.ESSymbol, "symbol");
var voidType = createIntrinsicType(TypeFlags.Void, "void");
var undefinedType = createIntrinsicType(TypeFlags.Undefined | TypeFlags.ContainsUndefinedOrNull, "undefined");
var nullType = createIntrinsicType(TypeFlags.Null | TypeFlags.ContainsUndefinedOrNull, "null");
var unknownType = createIntrinsicType(TypeFlags.Any, "unknown");
var resolvingType = createIntrinsicType(TypeFlags.Any, "__resolving__");
var emptyObjectType = createAnonymousType(undefined, emptySymbols, emptyArray, emptyArray, undefined, undefined);
var anyFunctionType = createAnonymousType(undefined, emptySymbols, emptyArray, emptyArray, undefined, undefined);
var noConstraintType = createAnonymousType(undefined, emptySymbols, emptyArray, emptyArray, undefined, undefined);
var inferenceFailureType = createAnonymousType(undefined, emptySymbols, emptyArray, emptyArray, undefined, undefined);
var anySignature = createSignature(undefined, undefined, emptyArray, anyType, 0, false, false);
var unknownSignature = createSignature(undefined, undefined, emptyArray, unknownType, 0, false, false);
var globals: SymbolTable = {};
var globalArraySymbol: Symbol;
var globalESSymbolConstructorSymbol: Symbol;
var globalObjectType: ObjectType;
var globalFunctionType: ObjectType;
var globalArrayType: ObjectType;
var globalStringType: ObjectType;
var globalNumberType: ObjectType;
var globalBooleanType: ObjectType;
var globalRegExpType: ObjectType;
var globalTemplateStringsArrayType: ObjectType;
var globalESSymbolType: ObjectType;
var anyArrayType: Type;
var tupleTypes: Map<TupleType> = {};
var unionTypes: Map<UnionType> = {};
var stringLiteralTypes: Map<StringLiteralType> = {};
var emitExtends = false;
var mergedSymbols: Symbol[] = [];
var symbolLinks: SymbolLinks[] = [];
var nodeLinks: NodeLinks[] = [];
var potentialThisCollisions: Node[] = [];
var diagnostics = createDiagnosticCollection();
var primitiveTypeInfo: Map<{ type: Type; flags: TypeFlags }> = {
"string": {
type: stringType,
flags: TypeFlags.StringLike
},
"number": {
type: numberType,
flags: TypeFlags.NumberLike
},
"boolean": {
type: booleanType,
flags: TypeFlags.Boolean
},
"symbol": {
type: esSymbolType,
flags: TypeFlags.ESSymbol
}
};
function getEmitResolver(sourceFile?: SourceFile) {
// Ensure we have all the type information in place for this file so that all the
// emitter questions of this resolver will return the right information.
getDiagnostics(sourceFile);
return emitResolver;
}
function error(location: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any): void {
var diagnostic = location
? createDiagnosticForNode(location, message, arg0, arg1, arg2)
: createCompilerDiagnostic(message, arg0, arg1, arg2);
diagnostics.add(diagnostic);
}
function createSymbol(flags: SymbolFlags, name: string): Symbol {
return new Symbol(flags, name);
}
function getExcludedSymbolFlags(flags: SymbolFlags): SymbolFlags {
var result: SymbolFlags = 0;
if (flags & SymbolFlags.BlockScopedVariable) result |= SymbolFlags.BlockScopedVariableExcludes;
if (flags & SymbolFlags.FunctionScopedVariable) result |= SymbolFlags.FunctionScopedVariableExcludes;
if (flags & SymbolFlags.Property) result |= SymbolFlags.PropertyExcludes;
if (flags & SymbolFlags.EnumMember) result |= SymbolFlags.EnumMemberExcludes;
if (flags & SymbolFlags.Function) result |= SymbolFlags.FunctionExcludes;
if (flags & SymbolFlags.Class) result |= SymbolFlags.ClassExcludes;
if (flags & SymbolFlags.Interface) result |= SymbolFlags.InterfaceExcludes;
if (flags & SymbolFlags.RegularEnum) result |= SymbolFlags.RegularEnumExcludes;
if (flags & SymbolFlags.ConstEnum) result |= SymbolFlags.ConstEnumExcludes;
if (flags & SymbolFlags.ValueModule) result |= SymbolFlags.ValueModuleExcludes;
if (flags & SymbolFlags.Method) result |= SymbolFlags.MethodExcludes;
if (flags & SymbolFlags.GetAccessor) result |= SymbolFlags.GetAccessorExcludes;
if (flags & SymbolFlags.SetAccessor) result |= SymbolFlags.SetAccessorExcludes;
if (flags & SymbolFlags.TypeParameter) result |= SymbolFlags.TypeParameterExcludes;
if (flags & SymbolFlags.TypeAlias) result |= SymbolFlags.TypeAliasExcludes;
if (flags & SymbolFlags.Import) result |= SymbolFlags.ImportExcludes;
return result;
}
function recordMergedSymbol(target: Symbol, source: Symbol) {
if (!source.mergeId) source.mergeId = nextMergeId++;
mergedSymbols[source.mergeId] = target;
}
function cloneSymbol(symbol: Symbol): Symbol {
var result = createSymbol(symbol.flags | SymbolFlags.Merged, symbol.name);
result.declarations = symbol.declarations.slice(0);
result.parent = symbol.parent;
if (symbol.valueDeclaration) result.valueDeclaration = symbol.valueDeclaration;
if (symbol.constEnumOnlyModule) result.constEnumOnlyModule = true;
if (symbol.members) result.members = cloneSymbolTable(symbol.members);
if (symbol.exports) result.exports = cloneSymbolTable(symbol.exports);
recordMergedSymbol(result, symbol);
return result;
}
function extendSymbol(target: Symbol, source: Symbol) {
if (!(target.flags & getExcludedSymbolFlags(source.flags))) {
if (source.flags & SymbolFlags.ValueModule && target.flags & SymbolFlags.ValueModule && target.constEnumOnlyModule && !source.constEnumOnlyModule) {
// reset flag when merging instantiated module into value module that has only const enums
target.constEnumOnlyModule = false;
}
target.flags |= source.flags;
if (!target.valueDeclaration && source.valueDeclaration) target.valueDeclaration = source.valueDeclaration;
forEach(source.declarations, node => {
target.declarations.push(node);
});
if (source.members) {
if (!target.members) target.members = {};
extendSymbolTable(target.members, source.members);
}
if (source.exports) {
if (!target.exports) target.exports = {};
extendSymbolTable(target.exports, source.exports);
}
recordMergedSymbol(target, source);
}
else {
var message = target.flags & SymbolFlags.BlockScopedVariable || source.flags & SymbolFlags.BlockScopedVariable
? Diagnostics.Cannot_redeclare_block_scoped_variable_0 : Diagnostics.Duplicate_identifier_0;
forEach(source.declarations, node => {
error(node.name ? node.name : node, message, symbolToString(source));
});
forEach(target.declarations, node => {
error(node.name ? node.name : node, message, symbolToString(source));
});
}
}
function cloneSymbolTable(symbolTable: SymbolTable): SymbolTable {
var result: SymbolTable = {};
for (var id in symbolTable) {
if (hasProperty(symbolTable, id)) {
result[id] = symbolTable[id];
}
}
return result;
}
function extendSymbolTable(target: SymbolTable, source: SymbolTable) {
for (var id in source) {
if (hasProperty(source, id)) {
if (!hasProperty(target, id)) {
target[id] = source[id];
}
else {
var symbol = target[id];
if (!(symbol.flags & SymbolFlags.Merged)) {
target[id] = symbol = cloneSymbol(symbol);
}
extendSymbol(symbol, source[id]);
}
}
}
}
function getSymbolLinks(symbol: Symbol): SymbolLinks {
if (symbol.flags & SymbolFlags.Transient) return <TransientSymbol>symbol;
if (!symbol.id) symbol.id = nextSymbolId++;
return symbolLinks[symbol.id] || (symbolLinks[symbol.id] = {});
}
function getNodeLinks(node: Node): NodeLinks {
if (!node.id) node.id = nextNodeId++;
return nodeLinks[node.id] || (nodeLinks[node.id] = {});
}
function getSourceFile(node: Node): SourceFile {
return <SourceFile>getAncestor(node, SyntaxKind.SourceFile);
}
function isGlobalSourceFile(node: Node) {
return node.kind === SyntaxKind.SourceFile && !isExternalModule(<SourceFile>node);
}
function getSymbol(symbols: SymbolTable, name: string, meaning: SymbolFlags): Symbol {
if (meaning && hasProperty(symbols, name)) {
var symbol = symbols[name];
Debug.assert((symbol.flags & SymbolFlags.Instantiated) === 0, "Should never get an instantiated symbol here.");
if (symbol.flags & meaning) {
return symbol;
}
if (symbol.flags & SymbolFlags.Import) {
var target = resolveImport(symbol);
// unknown symbol will mean that there were reported error during import resolution
// treat it as positive answer to avoid cascading errors
if (target === unknownSymbol || target.flags & meaning) {
return symbol;
}
}
}
// return undefined if we can't find a symbol.
}
/** Returns true if node1 is defined before node 2**/
function isDefinedBefore(node1: Node, node2: Node): boolean {
var file1 = getSourceFileOfNode(node1);
var file2 = getSourceFileOfNode(node2);
if (file1 === file2) {
return node1.pos <= node2.pos;
}
if (!compilerOptions.out) {
return true;
}
var sourceFiles = host.getSourceFiles();
return sourceFiles.indexOf(file1) <= sourceFiles.indexOf(file2);
}
// Resolve a given name for a given meaning at a given location. An error is reported if the name was not found and
// the nameNotFoundMessage argument is not undefined. Returns the resolved symbol, or undefined if no symbol with
// the given name can be found.
function resolveName(location: Node, name: string, meaning: SymbolFlags, nameNotFoundMessage: DiagnosticMessage, nameArg: string | Identifier): Symbol {
var result: Symbol;
var lastLocation: Node;
var propertyWithInvalidInitializer: Node;
var errorLocation = location;
loop: while (location) {
// Locals of a source file are not in scope (because they get merged into the global symbol table)
if (location.locals && !isGlobalSourceFile(location)) {
if (result = getSymbol(location.locals, name, meaning)) {
break loop;
}
}
switch (location.kind) {
case SyntaxKind.SourceFile:
if (!isExternalModule(<SourceFile>location)) break;
case SyntaxKind.ModuleDeclaration:
if (result = getSymbol(getSymbolOfNode(location).exports, name, meaning & SymbolFlags.ModuleMember)) {
break loop;
}
break;
case SyntaxKind.EnumDeclaration:
if (result = getSymbol(getSymbolOfNode(location).exports, name, meaning & SymbolFlags.EnumMember)) {
break loop;
}
break;
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
// TypeScript 1.0 spec (April 2014): 8.4.1
// Initializer expressions for instance member variables are evaluated in the scope
// of the class constructor body but are not permitted to reference parameters or
// local variables of the constructor. This effectively means that entities from outer scopes
// by the same name as a constructor parameter or local variable are inaccessible
// in initializer expressions for instance member variables.
if (location.parent.kind === SyntaxKind.ClassDeclaration && !(location.flags & NodeFlags.Static)) {
var ctor = findConstructorDeclaration(<ClassDeclaration>location.parent);
if (ctor && ctor.locals) {
if (getSymbol(ctor.locals, name, meaning & SymbolFlags.Value)) {
// Remember the property node, it will be used later to report appropriate error
propertyWithInvalidInitializer = location;
}
}
}
break;
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
if (result = getSymbol(getSymbolOfNode(location).members, name, meaning & SymbolFlags.Type)) {
if (lastLocation && lastLocation.flags & NodeFlags.Static) {
// TypeScript 1.0 spec (April 2014): 3.4.1
// The scope of a type parameter extends over the entire declaration with which the type
// parameter list is associated, with the exception of static member declarations in classes.
error(errorLocation, Diagnostics.Static_members_cannot_reference_class_type_parameters);
return undefined;
}
break loop;
}
break;
// It is not legal to reference a class's own type parameters from a computed property name that
// belongs to the class. For example:
//
// function foo<T>() { return '' }
// class C<T> { // <-- Class's own type parameter T
// [foo<T>()]() { } // <-- Reference to T from class's own computed property
// }
//
case SyntaxKind.ComputedPropertyName:
var grandparent = location.parent.parent;
if (grandparent.kind === SyntaxKind.ClassDeclaration || grandparent.kind === SyntaxKind.InterfaceDeclaration) {
// A reference to this grandparent's type parameters would be an error
if (result = getSymbol(getSymbolOfNode(grandparent).members, name, meaning & SymbolFlags.Type)) {
error(errorLocation, Diagnostics.A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type);
return undefined;
}
}
break;
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ArrowFunction:
if (name === "arguments") {
result = argumentsSymbol;
break loop;
}
break;
case SyntaxKind.FunctionExpression:
if (name === "arguments") {
result = argumentsSymbol;
break loop;
}
var id = (<FunctionExpression>location).name;
if (id && name === id.text) {
result = location.symbol;
break loop;
}
break;
case SyntaxKind.CatchClause:
var id = (<CatchClause>location).name;
if (name === id.text) {
result = location.symbol;
break loop;
}
break;
}
lastLocation = location;
location = location.parent;
}
if (!result) {
result = getSymbol(globals, name, meaning);
}
if (!result) {
if (nameNotFoundMessage) {
error(errorLocation, nameNotFoundMessage, typeof nameArg === "string" ? nameArg : declarationNameToString(nameArg));
}
return undefined;
}
// Perform extra checks only if error reporting was requested
if (nameNotFoundMessage) {
if (propertyWithInvalidInitializer) {
// We have a match, but the reference occurred within a property initializer and the identifier also binds
// to a local variable in the constructor where the code will be emitted.
var propertyName = (<PropertyDeclaration>propertyWithInvalidInitializer).name;
error(errorLocation, Diagnostics.Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor,
declarationNameToString(propertyName), typeof nameArg === "string" ? nameArg : declarationNameToString(nameArg));
return undefined;
}
if (result.flags & SymbolFlags.BlockScopedVariable) {
// Block-scoped variables cannot be used before their definition
var declaration = forEach(result.declarations, d => getCombinedNodeFlags(d) & NodeFlags.BlockScoped ? d : undefined);
Debug.assert(declaration !== undefined, "Block-scoped variable declaration is undefined");
if (!isDefinedBefore(declaration, errorLocation)) {
error(errorLocation, Diagnostics.Block_scoped_variable_0_used_before_its_declaration, declarationNameToString(declaration.name));
}
}
}
return result;
}
function resolveImport(symbol: Symbol): Symbol {
Debug.assert((symbol.flags & SymbolFlags.Import) !== 0, "Should only get Imports here.");
var links = getSymbolLinks(symbol);
if (!links.target) {
links.target = resolvingSymbol;
var node = <ImportDeclaration>getDeclarationOfKind(symbol, SyntaxKind.ImportDeclaration);
// Grammar checking
if (node.moduleReference.kind === SyntaxKind.ExternalModuleReference) {
if ((<ExternalModuleReference>node.moduleReference).expression.kind !== SyntaxKind.StringLiteral) {
grammarErrorOnNode((<ExternalModuleReference>node.moduleReference).expression, Diagnostics.String_literal_expected);
}
}
var target = node.moduleReference.kind === SyntaxKind.ExternalModuleReference
? resolveExternalModuleName(node, getExternalModuleImportDeclarationExpression(node))
: getSymbolOfPartOfRightHandSideOfImport(<EntityName>node.moduleReference, node);
if (links.target === resolvingSymbol) {
links.target = target || unknownSymbol;
}
else {
error(node, Diagnostics.Circular_definition_of_import_alias_0, symbolToString(symbol));
}
}
else if (links.target === resolvingSymbol) {
links.target = unknownSymbol;
}
return links.target;
}
// This function is only for imports with entity names
function getSymbolOfPartOfRightHandSideOfImport(entityName: EntityName, importDeclaration?: ImportDeclaration): Symbol {
if (!importDeclaration) {
importDeclaration = <ImportDeclaration>getAncestor(entityName, SyntaxKind.ImportDeclaration);
Debug.assert(importDeclaration !== undefined);
}
// There are three things we might try to look for. In the following examples,
// the search term is enclosed in |...|:
//
// import a = |b|; // Namespace
// import a = |b.c|; // Value, type, namespace
// import a = |b.c|.d; // Namespace
if (entityName.kind === SyntaxKind.Identifier && isRightSideOfQualifiedNameOrPropertyAccess(entityName)) {
entityName = <QualifiedName>entityName.parent;
}
// Check for case 1 and 3 in the above example
if (entityName.kind === SyntaxKind.Identifier || entityName.parent.kind === SyntaxKind.QualifiedName) {
return resolveEntityName(importDeclaration, entityName, SymbolFlags.Namespace);
}
else {
// Case 2 in above example
// entityName.kind could be a QualifiedName or a Missing identifier
Debug.assert(entityName.parent.kind === SyntaxKind.ImportDeclaration);
return resolveEntityName(importDeclaration, entityName, SymbolFlags.Value | SymbolFlags.Type | SymbolFlags.Namespace);
}
}
function getFullyQualifiedName(symbol: Symbol): string {
return symbol.parent ? getFullyQualifiedName(symbol.parent) + "." + symbolToString(symbol) : symbolToString(symbol);
}
// Resolves a qualified name and any involved import aliases
function resolveEntityName(location: Node, name: EntityName, meaning: SymbolFlags): Symbol {
if (getFullWidth(name) === 0) {
return undefined;
}
if (name.kind === SyntaxKind.Identifier) {
var symbol = resolveName(location,(<Identifier>name).text, meaning, Diagnostics.Cannot_find_name_0, <Identifier>name);
if (!symbol) {
return;
}
}
else if (name.kind === SyntaxKind.QualifiedName) {
var namespace = resolveEntityName(location,(<QualifiedName>name).left, SymbolFlags.Namespace);
if (!namespace || namespace === unknownSymbol || getFullWidth((<QualifiedName>name).right) === 0) return;
var symbol = getSymbol(namespace.exports,(<QualifiedName>name).right.text, meaning);
if (!symbol) {
error(location, Diagnostics.Module_0_has_no_exported_member_1, getFullyQualifiedName(namespace),
declarationNameToString((<QualifiedName>name).right));
return;
}
}
Debug.assert((symbol.flags & SymbolFlags.Instantiated) === 0, "Should never get an instantiated symbol here.");
return symbol.flags & meaning ? symbol : resolveImport(symbol);
}
function isExternalModuleNameRelative(moduleName: string): boolean {
// TypeScript 1.0 spec (April 2014): 11.2.1
// An external module name is "relative" if the first term is "." or "..".
return moduleName.substr(0, 2) === "./" || moduleName.substr(0, 3) === "../" || moduleName.substr(0, 2) === ".\\" || moduleName.substr(0, 3) === "..\\";
}
function resolveExternalModuleName(location: Node, moduleReferenceExpression: Expression): Symbol {
if (moduleReferenceExpression.kind !== SyntaxKind.StringLiteral) {
return;
}
var moduleReferenceLiteral = <LiteralExpression>moduleReferenceExpression;
var searchPath = getDirectoryPath(getSourceFile(location).fileName);
// Module names are escaped in our symbol table. However, string literal values aren't.
// Escape the name in the "require(...)" clause to ensure we find the right symbol.
var moduleName = escapeIdentifier(moduleReferenceLiteral.text);
if (!moduleName) return;
var isRelative = isExternalModuleNameRelative(moduleName);
if (!isRelative) {
var symbol = getSymbol(globals, '"' + moduleName + '"', SymbolFlags.ValueModule);
if (symbol) {
return getResolvedExportSymbol(symbol);
}
}
while (true) {
var fileName = normalizePath(combinePaths(searchPath, moduleName));
var sourceFile = host.getSourceFile(fileName + ".ts") || host.getSourceFile(fileName + ".d.ts");
if (sourceFile || isRelative) break;
var parentPath = getDirectoryPath(searchPath);
if (parentPath === searchPath) break;
searchPath = parentPath;
}
if (sourceFile) {
if (sourceFile.symbol) {
return getResolvedExportSymbol(sourceFile.symbol);
}
error(moduleReferenceLiteral, Diagnostics.File_0_is_not_an_external_module, sourceFile.fileName);
return;
}
error(moduleReferenceLiteral, Diagnostics.Cannot_find_external_module_0, moduleName);
}
function getResolvedExportSymbol(moduleSymbol: Symbol): Symbol {
var symbol = getExportAssignmentSymbol(moduleSymbol);
if (symbol) {
if (symbol.flags & (SymbolFlags.Value | SymbolFlags.Type | SymbolFlags.Namespace)) {
return symbol;
}
if (symbol.flags & SymbolFlags.Import) {
return resolveImport(symbol);
}
}
return moduleSymbol;
}
function getExportAssignmentSymbol(symbol: Symbol): Symbol {
checkTypeOfExportAssignmentSymbol(symbol);
var symbolLinks = getSymbolLinks(symbol);
return symbolLinks.exportAssignSymbol === unknownSymbol ? undefined : symbolLinks.exportAssignSymbol;
}
function checkTypeOfExportAssignmentSymbol(containerSymbol: Symbol): void {
var symbolLinks = getSymbolLinks(containerSymbol);
if (!symbolLinks.exportAssignSymbol) {
var exportInformation = collectExportInformationForSourceFileOrModule(containerSymbol);
if (exportInformation.exportAssignments.length) {
if (exportInformation.exportAssignments.length > 1) {
// TypeScript 1.0 spec (April 2014): 11.2.4
// It is an error for an external module to contain more than one export assignment.
forEach(exportInformation.exportAssignments, node => error(node, Diagnostics.A_module_cannot_have_more_than_one_export_assignment));
}
var node = exportInformation.exportAssignments[0];
if (exportInformation.hasExportedMember) {
// TypeScript 1.0 spec (April 2014): 11.2.3
// If an external module contains an export assignment it is an error
// for the external module to also contain export declarations.
// The two types of exports are mutually exclusive.
error(node, Diagnostics.An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements);
}
if (node.exportName.text) {
var meaning = SymbolFlags.Value | SymbolFlags.Type | SymbolFlags.Namespace;
var exportSymbol = resolveName(node, node.exportName.text, meaning, Diagnostics.Cannot_find_name_0, node.exportName);
}
}
symbolLinks.exportAssignSymbol = exportSymbol || unknownSymbol;
}
}
function collectExportInformationForSourceFileOrModule(symbol: Symbol) {
var seenExportedMember = false;
var result: ExportAssignment[] = [];
forEach(symbol.declarations, declaration => {
var block = <Block>(declaration.kind === SyntaxKind.SourceFile ? declaration : (<ModuleDeclaration>declaration).body);
forEach(block.statements, node => {
if (node.kind === SyntaxKind.ExportAssignment) {
result.push(<ExportAssignment>node);
}
else {
seenExportedMember = seenExportedMember || (node.flags & NodeFlags.Export) !== 0;
}
});
});
return {
hasExportedMember: seenExportedMember,
exportAssignments: result
};
}
function getMergedSymbol(symbol: Symbol): Symbol {
var merged: Symbol;
return symbol && symbol.mergeId && (merged = mergedSymbols[symbol.mergeId]) ? merged : symbol;
}
function getSymbolOfNode(node: Node): Symbol {
return getMergedSymbol(node.symbol);
}
function getParentOfSymbol(symbol: Symbol): Symbol {
return getMergedSymbol(symbol.parent);
}
function getExportSymbolOfValueSymbolIfExported(symbol: Symbol): Symbol {
return symbol && (symbol.flags & SymbolFlags.ExportValue) !== 0
? getMergedSymbol(symbol.exportSymbol)
: symbol;
}
function symbolIsValue(symbol: Symbol): boolean {
// If it is an instantiated symbol, then it is a value if the symbol it is an
// instantiation of is a value.
if (symbol.flags & SymbolFlags.Instantiated) {
return symbolIsValue(getSymbolLinks(symbol).target);
}
// If the symbol has the value flag, it is trivially a value.
if (symbol.flags & SymbolFlags.Value) {
return true;
}
// If it is an import, then it is a value if the symbol it resolves to is a value.
if (symbol.flags & SymbolFlags.Import) {
return (resolveImport(symbol).flags & SymbolFlags.Value) !== 0;
}
return false;
}
function findConstructorDeclaration(node: ClassDeclaration): ConstructorDeclaration {
var members = node.members;
for (var i = 0; i < members.length; i++) {
var member = members[i];
if (member.kind === SyntaxKind.Constructor && nodeIsPresent((<ConstructorDeclaration>member).body)) {
return <ConstructorDeclaration>member;
}
}
}
function createType(flags: TypeFlags): Type {
var result = new Type(checker, flags);
result.id = typeCount++;
return result;
}
function createIntrinsicType(kind: TypeFlags, intrinsicName: string): IntrinsicType {
var type = <IntrinsicType>createType(kind);
type.intrinsicName = intrinsicName;
return type;
}
function createObjectType(kind: TypeFlags, symbol?: Symbol): ObjectType {
var type = <ObjectType>createType(kind);
type.symbol = symbol;
return type;
}
// A reserved member name starts with two underscores, but the third character cannot be an underscore
// or the @ symbol. A third underscore indicates an escaped form of an identifer that started
// with at least two underscores. The @ character indicates that the name is denoted by a well known ES
// Symbol instance.
function isReservedMemberName(name: string) {
return name.charCodeAt(0) === CharacterCodes._ &&
name.charCodeAt(1) === CharacterCodes._ &&
name.charCodeAt(2) !== CharacterCodes._ &&
name.charCodeAt(2) !== CharacterCodes.at;
}
function getNamedMembers(members: SymbolTable): Symbol[] {
var result: Symbol[];
for (var id in members) {
if (hasProperty(members, id)) {
if (!isReservedMemberName(id)) {
if (!result) result = [];
var symbol = members[id];
if (symbolIsValue(symbol)) {
result.push(symbol);
}
}
}
}
return result || emptyArray;
}
function setObjectTypeMembers(type: ObjectType, members: SymbolTable, callSignatures: Signature[], constructSignatures: Signature[], stringIndexType: Type, numberIndexType: Type): ResolvedType {
(<ResolvedType>type).members = members;
(<ResolvedType>type).properties = getNamedMembers(members);
(<ResolvedType>type).callSignatures = callSignatures;
(<ResolvedType>type).constructSignatures = constructSignatures;
if (stringIndexType) (<ResolvedType>type).stringIndexType = stringIndexType;
if (numberIndexType) (<ResolvedType>type).numberIndexType = numberIndexType;
return <ResolvedType>type;
}
function createAnonymousType(symbol: Symbol, members: SymbolTable, callSignatures: Signature[], constructSignatures: Signature[], stringIndexType: Type, numberIndexType: Type): ResolvedType {
return setObjectTypeMembers(createObjectType(TypeFlags.Anonymous, symbol),
members, callSignatures, constructSignatures, stringIndexType, numberIndexType);
}
function forEachSymbolTableInScope<T>(enclosingDeclaration: Node, callback: (symbolTable: SymbolTable) => T): T {
var result: T;
for (var location = enclosingDeclaration; location; location = location.parent) {
// Locals of a source file are not in scope (because they get merged into the global symbol table)
if (location.locals && !isGlobalSourceFile(location)) {
if (result = callback(location.locals)) {
return result;
}
}
switch (location.kind) {
case SyntaxKind.SourceFile:
if (!isExternalModule(<SourceFile>location)) {
break;
}
case SyntaxKind.ModuleDeclaration:
if (result = callback(getSymbolOfNode(location).exports)) {
return result;
}
break;
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
if (result = callback(getSymbolOfNode(location).members)) {
return result;
}
break;
}
}
return callback(globals);
}
function getQualifiedLeftMeaning(rightMeaning: SymbolFlags) {
// If we are looking in value space, the parent meaning is value, other wise it is namespace
return rightMeaning === SymbolFlags.Value ? SymbolFlags.Value : SymbolFlags.Namespace;
}
function getAccessibleSymbolChain(symbol: Symbol, enclosingDeclaration: Node, meaning: SymbolFlags, useOnlyExternalAliasing: boolean): Symbol[] {
function getAccessibleSymbolChainFromSymbolTable(symbols: SymbolTable): Symbol[] {
function canQualifySymbol(symbolFromSymbolTable: Symbol, meaning: SymbolFlags) {
// If the symbol is equivalent and doesn't need further qualification, this symbol is accessible
if (!needsQualification(symbolFromSymbolTable, enclosingDeclaration, meaning)) {
return true;
}
// If symbol needs qualification, make sure that parent is accessible, if it is then this symbol is accessible too
var accessibleParent = getAccessibleSymbolChain(symbolFromSymbolTable.parent, enclosingDeclaration, getQualifiedLeftMeaning(meaning), useOnlyExternalAliasing);
return !!accessibleParent;
}
function isAccessible(symbolFromSymbolTable: Symbol, resolvedAliasSymbol?: Symbol) {
if (symbol === (resolvedAliasSymbol || symbolFromSymbolTable)) {
// if the symbolFromSymbolTable is not external module (it could be if it was determined as ambient external module and would be in globals table)
// and if symbolfrom symbolTable or alias resolution matches the symbol,
// check the symbol can be qualified, it is only then this symbol is accessible
return !forEach(symbolFromSymbolTable.declarations, hasExternalModuleSymbol) &&
canQualifySymbol(symbolFromSymbolTable, meaning);
}
}
// If symbol is directly available by its name in the symbol table
if (isAccessible(lookUp(symbols, symbol.name))) {
return [symbol];
}
// Check if symbol is any of the alias
return forEachValue(symbols, symbolFromSymbolTable => {
if (symbolFromSymbolTable.flags & SymbolFlags.Import) {
if (!useOnlyExternalAliasing || // We can use any type of alias to get the name
// Is this external alias, then use it to name
ts.forEach(symbolFromSymbolTable.declarations, isExternalModuleImportDeclaration)) {
var resolvedImportedSymbol = resolveImport(symbolFromSymbolTable);
if (isAccessible(symbolFromSymbolTable, resolveImport(symbolFromSymbolTable))) {
return [symbolFromSymbolTable];
}
// Look in the exported members, if we can find accessibleSymbolChain, symbol is accessible using this chain
// but only if the symbolFromSymbolTable can be qualified
var accessibleSymbolsFromExports = resolvedImportedSymbol.exports ? getAccessibleSymbolChainFromSymbolTable(resolvedImportedSymbol.exports) : undefined;
if (accessibleSymbolsFromExports && canQualifySymbol(symbolFromSymbolTable, getQualifiedLeftMeaning(meaning))) {
return [symbolFromSymbolTable].concat(accessibleSymbolsFromExports);
}
}
}
});
}
if (symbol) {
return forEachSymbolTableInScope(enclosingDeclaration, getAccessibleSymbolChainFromSymbolTable);
}
}
function needsQualification(symbol: Symbol, enclosingDeclaration: Node, meaning: SymbolFlags) {
var qualify = false;
forEachSymbolTableInScope(enclosingDeclaration, symbolTable => {
// If symbol of this name is not available in the symbol table we are ok
if (!hasProperty(symbolTable, symbol.name)) {
// Continue to the next symbol table
return false;
}
// If the symbol with this name is present it should refer to the symbol
var symbolFromSymbolTable = symbolTable[symbol.name];
if (symbolFromSymbolTable === symbol) {
// No need to qualify
return true;
}
// Qualify if the symbol from symbol table has same meaning as expected
symbolFromSymbolTable = (symbolFromSymbolTable.flags & SymbolFlags.Import) ? resolveImport(symbolFromSymbolTable) : symbolFromSymbolTable;
if (symbolFromSymbolTable.flags & meaning) {
qualify = true;
return true;
}
// Continue to the next symbol table
return false;
});
return qualify;
}
function isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node, meaning: SymbolFlags): SymbolAccessiblityResult {
if (symbol && enclosingDeclaration && !(symbol.flags & SymbolFlags.TypeParameter)) {
var initialSymbol = symbol;
var meaningToLook = meaning;
while (symbol) {
// Symbol is accessible if it by itself is accessible
var accessibleSymbolChain = getAccessibleSymbolChain(symbol, enclosingDeclaration, meaningToLook, /*useOnlyExternalAliasing*/ false);
if (accessibleSymbolChain) {
var hasAccessibleDeclarations = hasVisibleDeclarations(accessibleSymbolChain[0]);
if (!hasAccessibleDeclarations) {
return <SymbolAccessiblityResult>{
accessibility: SymbolAccessibility.NotAccessible,
errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
errorModuleName: symbol !== initialSymbol ? symbolToString(symbol, enclosingDeclaration, SymbolFlags.Namespace) : undefined,
};
}
return hasAccessibleDeclarations;
}
// If we haven't got the accessible symbol, it doesn't mean the symbol is actually inaccessible.
// It could be a qualified symbol and hence verify the path
// e.g.:
// module m {
// export class c {
// }
// }
// var x: typeof m.c
// In the above example when we start with checking if typeof m.c symbol is accessible,
// we are going to see if c can be accessed in scope directly.
// But it can't, hence the accessible is going to be undefined, but that doesn't mean m.c is inaccessible
// It is accessible if the parent m is accessible because then m.c can be accessed through qualification
meaningToLook = getQualifiedLeftMeaning(meaning);
symbol = getParentOfSymbol(symbol);
}
// This could be a symbol that is not exported in the external module
// or it could be a symbol from different external module that is not aliased and hence cannot be named
var symbolExternalModule = forEach(initialSymbol.declarations, getExternalModuleContainer);
if (symbolExternalModule) {
var enclosingExternalModule = getExternalModuleContainer(enclosingDeclaration);
if (symbolExternalModule !== enclosingExternalModule) {
// name from different external module that is not visible
return {
accessibility: SymbolAccessibility.CannotBeNamed,
errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
errorModuleName: symbolToString(symbolExternalModule)
};
}
}
// Just a local name that is not accessible
return {
accessibility: SymbolAccessibility.NotAccessible,
errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
};
}
return { accessibility: SymbolAccessibility.Accessible };
function getExternalModuleContainer(declaration: Node) {
for (; declaration; declaration = declaration.parent) {
if (hasExternalModuleSymbol(declaration)) {
return getSymbolOfNode(declaration);
}
}
}
}
function hasExternalModuleSymbol(declaration: Node) {
return (declaration.kind === SyntaxKind.ModuleDeclaration && (<ModuleDeclaration>declaration).name.kind === SyntaxKind.StringLiteral) ||
(declaration.kind === SyntaxKind.SourceFile && isExternalModule(<SourceFile>declaration));
}
function hasVisibleDeclarations(symbol: Symbol): SymbolVisibilityResult {
var aliasesToMakeVisible: ImportDeclaration[];
if (forEach(symbol.declarations, declaration => !getIsDeclarationVisible(declaration))) {
return undefined;
}
return { accessibility: SymbolAccessibility.Accessible, aliasesToMakeVisible };
function getIsDeclarationVisible(declaration: Declaration) {
if (!isDeclarationVisible(declaration)) {
// Mark the unexported alias as visible if its parent is visible
// because these kind of aliases can be used to name types in declaration file
if (declaration.kind === SyntaxKind.ImportDeclaration &&
!(declaration.flags & NodeFlags.Export) &&
isDeclarationVisible(<Declaration>declaration.parent)) {
getNodeLinks(declaration).isVisible = true;
if (aliasesToMakeVisible) {
if (!contains(aliasesToMakeVisible, declaration)) {
aliasesToMakeVisible.push(<ImportDeclaration>declaration);
}
}
else {
aliasesToMakeVisible = [<ImportDeclaration>declaration];
}
return true;
}
// Declaration is not visible
return false;
}
return true;
}
}
function isEntityNameVisible(entityName: EntityName, enclosingDeclaration: Node): SymbolVisibilityResult {
// get symbol of the first identifier of the entityName
var meaning: SymbolFlags;
if (entityName.parent.kind === SyntaxKind.TypeQuery) {
// Typeof value
meaning = SymbolFlags.Value | SymbolFlags.ExportValue;
}
else if (entityName.kind === SyntaxKind.QualifiedName ||
entityName.parent.kind === SyntaxKind.ImportDeclaration) {
// Left identifier from type reference or TypeAlias
// Entity name of the import declaration
meaning = SymbolFlags.Namespace;
}
else {
// Type Reference or TypeAlias entity = Identifier