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1 // Copyright 2016 the V8 project authors. All rights reserved. | 1 // Copyright 2016 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/builtins/builtins.h" | 5 #include "src/builtins/builtins.h" |
6 #include "src/builtins/builtins-utils.h" | 6 #include "src/builtins/builtins-utils.h" |
7 | 7 |
8 #include "src/code-factory.h" | 8 #include "src/code-factory.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
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609 typedef compiler::Node Node; | 609 typedef compiler::Node Node; |
610 | 610 |
611 Node* receiver = assembler->Parameter(0); | 611 Node* receiver = assembler->Parameter(0); |
612 Node* context = assembler->Parameter(3); | 612 Node* context = assembler->Parameter(3); |
613 | 613 |
614 Node* result = assembler->ToThisValue( | 614 Node* result = assembler->ToThisValue( |
615 context, receiver, PrimitiveType::kString, "String.prototype.valueOf"); | 615 context, receiver, PrimitiveType::kString, "String.prototype.valueOf"); |
616 assembler->Return(result); | 616 assembler->Return(result); |
617 } | 617 } |
618 | 618 |
| 619 BUILTIN(StringPrototypeIterator) { |
| 620 HandleScope scope(isolate); |
| 621 TO_THIS_STRING(object, "String.prototype[Symbol.iterator]"); |
| 622 |
| 623 Handle<String> string; |
| 624 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, string, |
| 625 Object::ToString(isolate, object)); |
| 626 |
| 627 return *isolate->factory()->NewJSStringIterator(string); |
| 628 } |
| 629 |
| 630 BUILTIN(StringIteratorPrototypeNext) { |
| 631 HandleScope scope(isolate); |
| 632 |
| 633 if (!args.receiver()->IsJSStringIterator()) { |
| 634 Handle<String> reason = isolate->factory()->NewStringFromAsciiChecked( |
| 635 "String Iterator.prototype.next"); |
| 636 THROW_NEW_ERROR_RETURN_FAILURE( |
| 637 isolate, |
| 638 NewTypeError(MessageTemplate::kIncompatibleMethodReceiver, reason)); |
| 639 } |
| 640 Handle<JSStringIterator> iterator = |
| 641 Handle<JSStringIterator>::cast(args.receiver()); |
| 642 Handle<String> string(iterator->string()); |
| 643 |
| 644 int position = iterator->index(); |
| 645 int length = string->length(); |
| 646 |
| 647 if (position < length) { |
| 648 uint16_t lead = string->Get(position); |
| 649 if (lead >= 0xD800 && lead <= 0xDBFF && position + 1 < length) { |
| 650 uint16_t trail = string->Get(position + 1); |
| 651 if (V8_LIKELY(trail >= 0xDC00 && trail <= 0xDFFF)) { |
| 652 // Return surrogate pair code units |
| 653 iterator->set_index(position + 2); |
| 654 Handle<String> value = |
| 655 isolate->factory()->NewSurrogatePairString(lead, trail); |
| 656 return *isolate->factory()->NewJSIteratorResult(value, false); |
| 657 } |
| 658 } |
| 659 |
| 660 // Return single code unit |
| 661 iterator->set_index(position + 1); |
| 662 Handle<String> value = |
| 663 isolate->factory()->LookupSingleCharacterStringFromCode(lead); |
| 664 return *isolate->factory()->NewJSIteratorResult(value, false); |
| 665 } |
| 666 |
| 667 iterator->set_string(isolate->heap()->empty_string()); |
| 668 |
| 669 return *isolate->factory()->NewJSIteratorResult( |
| 670 isolate->factory()->undefined_value(), true); |
| 671 } |
| 672 |
619 } // namespace internal | 673 } // namespace internal |
620 } // namespace v8 | 674 } // namespace v8 |
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