ObjectEnvironmentRecord.cs 3.2 KB

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  1. using System;
  2. using System.Linq;
  3. using Jint.Native;
  4. using Jint.Native.Object;
  5. using Jint.Runtime.Descriptors;
  6. namespace Jint.Runtime.Environments
  7. {
  8. /// <summary>
  9. /// Represents an object environment record
  10. /// http://www.ecma-international.org/ecma-262/5.1/#sec-10.2.1.2
  11. /// </summary>
  12. public sealed class ObjectEnvironmentRecord : EnvironmentRecord
  13. {
  14. private readonly ObjectInstance _bindingObject;
  15. private readonly bool _provideThis;
  16. public ObjectEnvironmentRecord(Engine engine, ObjectInstance bindingObject, bool provideThis) : base(engine)
  17. {
  18. _bindingObject = bindingObject;
  19. _provideThis = provideThis;
  20. }
  21. public override bool HasBinding(in Key name)
  22. {
  23. return _bindingObject.HasProperty(name);
  24. }
  25. internal override bool TryGetBinding(
  26. in Key name,
  27. bool strict,
  28. out Binding binding,
  29. out JsValue value)
  30. {
  31. // we unwrap by name
  32. binding = default;
  33. var desc = _bindingObject.GetProperty(name);
  34. if (desc == PropertyDescriptor.Undefined)
  35. {
  36. value = default;
  37. return false;
  38. }
  39. value = ObjectInstance.UnwrapJsValue(desc, this);
  40. return true;
  41. }
  42. /// <summary>
  43. /// http://www.ecma-international.org/ecma-262/5.1/#sec-10.2.1.2.2
  44. /// </summary>
  45. public override void CreateMutableBinding(in Key name, JsValue value, bool configurable = true)
  46. {
  47. var propertyDescriptor = configurable
  48. ? new PropertyDescriptor(value, PropertyFlag.ConfigurableEnumerableWritable)
  49. : new PropertyDescriptor(value, PropertyFlag.NonConfigurable);
  50. _bindingObject.SetOwnProperty(name, propertyDescriptor);
  51. }
  52. public override void SetMutableBinding(in Key name, JsValue value, bool strict)
  53. {
  54. _bindingObject.Put(name, value, strict);
  55. }
  56. public override JsValue GetBindingValue(in Key name, bool strict)
  57. {
  58. var desc = _bindingObject.GetProperty(name);
  59. if (strict && desc == PropertyDescriptor.Undefined)
  60. {
  61. ExceptionHelper.ThrowReferenceError(_engine, name);
  62. }
  63. return ObjectInstance.UnwrapJsValue(desc, this);
  64. }
  65. public override bool DeleteBinding(in Key name)
  66. {
  67. return _bindingObject.Delete(name, false);
  68. }
  69. public override JsValue ImplicitThisValue()
  70. {
  71. if (_provideThis)
  72. {
  73. return _bindingObject;
  74. }
  75. return Undefined;
  76. }
  77. public override string[] GetAllBindingNames()
  78. {
  79. if (!ReferenceEquals(_bindingObject, null))
  80. {
  81. return _bindingObject.GetOwnProperties().Select( x=> x.Key).ToArray();
  82. }
  83. return ArrayExt.Empty<string>();
  84. }
  85. public override bool Equals(JsValue other)
  86. {
  87. return ReferenceEquals(_bindingObject, other);
  88. }
  89. internal override void FunctionWasCalled()
  90. {
  91. }
  92. }
  93. }