JsonTextReader.cs 3.5 KB

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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Text;
  4. namespace FastReport.Utils.Json
  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 readonly 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 = 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. ArgsToStringBuilder(sb, args);
  87. return new FormatException(sb.ToString());
  88. }
  89. public Exception ThrowEOF(string args)
  90. {
  91. return new FormatException("Unexpected end of input json, wait for " + args);
  92. }
  93. public Exception ThrowFormat(params char[] args)
  94. {
  95. StringBuilder sb = new StringBuilder();
  96. sb.Append("Json text at position ").Append(Position).Append(", unexpected symbol ").Append(Char).Append(", wait for");
  97. ArgsToStringBuilder(sb, args);
  98. return new FormatException(sb.ToString());
  99. }
  100. #endregion Public Methods
  101. #region Internal Methods
  102. internal string Substring(int startPos, int len)
  103. {
  104. return JsonText.Substring(startPos, len);
  105. }
  106. private static void ArgsToStringBuilder(StringBuilder sb, char[] args)
  107. {
  108. if (args.Length > 0)
  109. {
  110. sb.Append(' ').Append(args[0]);
  111. }
  112. for (int i = 1; i < args.Length; i++)
  113. {
  114. sb.Append(", ").Append(args[i]);
  115. }
  116. }
  117. #endregion Internal Methods
  118. }
  119. }