CollatorCompareFunction.cpp 2.5 KB

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  1. /*
  2. * Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
  3. *
  4. * SPDX-License-Identifier: BSD-2-Clause
  5. */
  6. #include <AK/Utf8View.h>
  7. #include <LibJS/Runtime/GlobalObject.h>
  8. #include <LibJS/Runtime/Intl/Collator.h>
  9. #include <LibJS/Runtime/Intl/CollatorCompareFunction.h>
  10. namespace JS::Intl {
  11. NonnullGCPtr<CollatorCompareFunction> CollatorCompareFunction::create(Realm& realm, Collator& collator)
  12. {
  13. return realm.heap().allocate<CollatorCompareFunction>(realm, realm, collator).release_allocated_value_but_fixme_should_propagate_errors();
  14. }
  15. CollatorCompareFunction::CollatorCompareFunction(Realm& realm, Collator& collator)
  16. : NativeFunction(realm.intrinsics().function_prototype())
  17. , m_collator(collator)
  18. {
  19. }
  20. void CollatorCompareFunction::initialize(Realm&)
  21. {
  22. auto& vm = this->vm();
  23. define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
  24. define_direct_property(vm.names.name, PrimitiveString::create(vm, String {}), Attribute::Configurable);
  25. }
  26. // 10.3.3.2 CompareStrings ( collator, x, y ), https://tc39.es/ecma402/#sec-collator-comparestrings
  27. double compare_strings(Collator& collator, Utf8View const& x, Utf8View const& y)
  28. {
  29. // FIXME: Implement https://unicode.org/reports/tr10
  30. (void)collator;
  31. auto x_iterator = x.begin();
  32. auto y_iterator = y.begin();
  33. for (; x_iterator != x.end() && y_iterator != y.end(); ++x_iterator, ++y_iterator) {
  34. if (*x_iterator != *y_iterator)
  35. return static_cast<double>(*x_iterator) - static_cast<double>(*y_iterator);
  36. }
  37. if (x_iterator != x.end())
  38. return 1.0;
  39. if (y_iterator != y.end())
  40. return -1.0;
  41. return 0.0;
  42. }
  43. // 10.3.3.1 Collator Compare Functions, https://tc39.es/ecma402/#sec-collator-compare-functions
  44. ThrowCompletionOr<Value> CollatorCompareFunction::call()
  45. {
  46. auto& vm = this->vm();
  47. // 1. Let collator be F.[[Collator]].
  48. // 2. Assert: Type(collator) is Object and collator has an [[InitializedCollator]] internal slot.
  49. // 3. If x is not provided, let x be undefined.
  50. // 4. If y is not provided, let y be undefined.
  51. // 5. Let X be ? ToString(x).
  52. auto x = TRY(vm.argument(0).to_string(vm));
  53. // 6. Let Y be ? ToString(y).
  54. auto y = TRY(vm.argument(1).to_string(vm));
  55. // 7. Return CompareStrings(collator, X, Y).
  56. return compare_strings(m_collator, x.code_points(), y.code_points());
  57. }
  58. void CollatorCompareFunction::visit_edges(Visitor& visitor)
  59. {
  60. Base::visit_edges(visitor);
  61. visitor.visit(m_collator);
  62. }
  63. }