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/IronPython_Main/Runtime/Microsoft.Scripting.Core/Actions/GetIndexBinder.cs

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C# | 88 lines | 30 code | 11 blank | 47 comment | 0 complexity | 9b343bc1b309737b32d56ec8b8681591 MD5 | raw file
Possible License(s): GPL-2.0, MPL-2.0-no-copyleft-exception, CPL-1.0, CC-BY-SA-3.0, BSD-3-Clause, ISC, AGPL-3.0, LGPL-2.1, Apache-2.0 
    

  1. /* ****************************************************************************

    2. 

  2.  *

    3. 

  3.  * Copyright (c) Microsoft Corporation. 

    4. 

  4.  *

    5. 

  5.  * This source code is subject to terms and conditions of the Apache License, Version 2.0. A 

    6. 

  6.  * copy of the license can be found in the License.html file at the root of this distribution. If 

    7. 

  7.  * you cannot locate the  Apache License, Version 2.0, please send an email to 

    8. 

  8.  * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 

    9. 

  9.  * by the terms of the Apache License, Version 2.0.

    10. 

  10.  *

    11. 

  11.  * You must not remove this notice, or any other, from this software.

    12. 

  12.  *

    13. 

  13.  *

    14. 

  14.  * ***************************************************************************/

    15. 

  15. 

    16. 

  16. using System.Dynamic.Utils;

    17. 

  17. 

    18. 

  18. namespace System.Dynamic {

    19. 

  19. 

    20. 

  20.     /// <summary>

    21. 

  21.     /// Represents the dynamic get index operation at the call site, providing the binding semantic and the details about the operation.

    22. 

  22.     /// </summary>

    23. 

  23.     public abstract class GetIndexBinder : DynamicMetaObjectBinder {

    24. 

  24.         private readonly CallInfo _callInfo;

    25. 

  25. 

    26. 

  26.         /// <summary>

    27. 

  27.         /// Initializes a new instance of the <see cref="GetIndexBinder" />.

    28. 

  28.         /// </summary>

    29. 

  29.         /// <param name="callInfo">The signature of the arguments at the call site.</param>

    30. 

  30.         protected GetIndexBinder(CallInfo callInfo) {

    31. 

  31.             ContractUtils.RequiresNotNull(callInfo, "callInfo");

    32. 

  32.             _callInfo = callInfo;

    33. 

  33.         }

    34. 

  34. 

    35. 

  35.         /// <summary>

    36. 

  36.         /// The result type of the operation.

    37. 

  37.         /// </summary>

    38. 

  38.         public override sealed Type ReturnType {

    39. 

  39.             get { return typeof(object); }

    40. 

  40.         }

    41. 

  41. 

    42. 

  42.         /// <summary>

    43. 

  43.         /// Gets the signature of the arguments at the call site.

    44. 

  44.         /// </summary>

    45. 

  45.         public CallInfo CallInfo {

    46. 

  46.             get { return _callInfo; }

    47. 

  47.         }

    48. 

  48. 

    49. 

  49.         /// <summary>

    50. 

  50.         /// Performs the binding of the dynamic get index operation.

    51. 

  51.         /// </summary>

    52. 

  52.         /// <param name="target">The target of the dynamic get index operation.</param>

    53. 

  53.         /// <param name="args">An array of arguments of the dynamic get index operation.</param>

    54. 

  54.         /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>

    55. 

  55.         public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) {

    56. 

  56.             ContractUtils.RequiresNotNull(target, "target");

    57. 

  57.             ContractUtils.RequiresNotNullItems(args, "args");

    58. 

  58. 

    59. 

  59.             return target.BindGetIndex(this, args);

    60. 

  60.         }

    61. 

  61.         

    62. 

  62.         // this is a standard DynamicMetaObjectBinder

    63. 

  63.         internal override sealed bool IsStandardBinder {

    64. 

  64.             get {

    65. 

  65.                 return true;

    66. 

  66.             }

    67. 

  67.         }

    68. 

  68. 

    69. 

  69.         /// <summary>

    70. 

  70.         /// Performs the binding of the dynamic get index operation if the target dynamic object cannot bind.

    71. 

  71.         /// </summary>

    72. 

  72.         /// <param name="target">The target of the dynamic get index operation.</param>

    73. 

  73.         /// <param name="indexes">The arguments of the dynamic get index operation.</param>

    74. 

  74.         /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>

    75. 

  75.         public DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] indexes) {

    76. 

  76.             return FallbackGetIndex(target, indexes, null);

    77. 

  77.         }

    78. 

  78. 

    79. 

  79.         /// <summary>

    80. 

  80.         /// When overridden in the derived class, performs the binding of the dynamic get index operation if the target dynamic object cannot bind.

    81. 

  81.         /// </summary>

    82. 

  82.         /// <param name="target">The target of the dynamic get index operation.</param>

    83. 

  83.         /// <param name="indexes">The arguments of the dynamic get index operation.</param>

    84. 

  84.         /// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param>

    85. 

  85.         /// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>

    86. 

  86.         public abstract DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] indexes, DynamicMetaObject errorSuggestion);

    87. 

  87.     }

    88. 

  88. }

    89. 

  89.