JsonTextReader.cs 3.5 KB

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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Text;
  4. namespace FastReport.Data.JsonConnection.JsonParser
  5. {
  6. internal class JsonTextReader : IDisposable
  7. {
  8. #region Private Fields
  9. private string jsonText;
  10. private Dictionary<string, string> pool = new Dictionary<string, string>();
  11. private int position;
  12. private bool stringOptimization;
  13. #endregion Private Fields
  14. #region Public Properties
  15. public char Char
  16. {
  17. get
  18. {
  19. return jsonText[position];
  20. }
  21. }
  22. public bool IsEOF
  23. {
  24. get
  25. {
  26. return position >= jsonText.Length;
  27. }
  28. }
  29. public bool IsNotEOF
  30. {
  31. get
  32. {
  33. return position < jsonText.Length;
  34. }
  35. }
  36. public string JsonText
  37. {
  38. get { return jsonText; }
  39. set { jsonText = value; }
  40. }
  41. public int Position
  42. {
  43. get { return position; }
  44. set { position = value; }
  45. }
  46. #endregion Public Properties
  47. #region Public Constructors
  48. public JsonTextReader(string jsonText)
  49. {
  50. stringOptimization = Utils.Config.IsStringOptimization;
  51. this.jsonText = jsonText;
  52. position = 0;
  53. }
  54. #endregion Public Constructors
  55. #region Public Methods
  56. public string Dedublicate(string value)
  57. {
  58. if (stringOptimization)
  59. {
  60. string result;
  61. if (pool.TryGetValue(value, out result))
  62. return result;
  63. return pool[value] = value;
  64. }
  65. return value;
  66. }
  67. public void Dispose()
  68. {
  69. JsonText = null;
  70. pool.Clear();
  71. pool = null;
  72. }
  73. public void ReadNext()
  74. {
  75. position++;
  76. }
  77. public void SkipWhiteSpace()
  78. {
  79. while (IsNotEOF && char.IsWhiteSpace(Char))
  80. position++;
  81. }
  82. public Exception ThrowEOF(params char[] args)
  83. {
  84. StringBuilder sb = new StringBuilder();
  85. sb.Append("Unexpected end of input json, wait for");
  86. if (args.Length > 0)
  87. {
  88. sb.Append(" ").Append(args[0]);
  89. }
  90. for (int i = 1; i < args.Length; i++)
  91. {
  92. sb.Append(", ").Append(args[i]);
  93. }
  94. return new FormatException(sb.ToString());
  95. }
  96. public Exception ThrowEOF(string args)
  97. {
  98. return new FormatException("Unexpected end of input json, wait for " + args);
  99. }
  100. public Exception ThrowFormat(params char[] args)
  101. {
  102. StringBuilder sb = new StringBuilder();
  103. sb.Append("Json text at position ").Append(Position).Append(", unexpected symbol ").Append(Char).Append(", wait for");
  104. if (args.Length > 0)
  105. {
  106. sb.Append(" ").Append(args[0]);
  107. }
  108. for (int i = 1; i < args.Length; i++)
  109. {
  110. sb.Append(", ").Append(args[i]);
  111. }
  112. return new FormatException(sb.ToString());
  113. }
  114. #endregion Public Methods
  115. #region Internal Methods
  116. internal string Substring(int startPos, int len)
  117. {
  118. return JsonText.Substring(startPos, len);
  119. }
  120. #endregion Internal Methods
  121. }
  122. }