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163
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1 using System;
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2 using System.Collections.Generic;
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3 using System.IO;
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4 using System.Globalization;
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5 using System.Diagnostics;
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6
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7 namespace Implab.JSON {
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8 public class JSONWriter {
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9 struct Context {
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10 public bool needComma;
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11 public JSONElementContext element;
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12 }
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13 Stack<Context> m_contextStack = new Stack<Context>();
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14 Context m_context;
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15
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16 const int BUFFER_SIZE = 64;
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17
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18 TextWriter m_writer;
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19 readonly bool m_indent = true;
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20 readonly int m_indentSize = 4;
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21 readonly char[] m_buffer = new char[BUFFER_SIZE];
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22 int m_bufferPos;
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23
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24 static readonly char [] _hex = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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25 static readonly char [] _escapeBKS,
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26 _escapeFWD,
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27 _escapeCR,
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28 _escapeNL,
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29 _escapeTAB,
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30 _escapeBSLASH,
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31 _escapeQ;
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32
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33 static JSONWriter() {
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34 _escapeBKS = "\\b".ToCharArray();
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35 _escapeFWD = "\\f".ToCharArray();
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36 _escapeCR = "\\r".ToCharArray();
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37 _escapeNL = "\\n".ToCharArray();
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38 _escapeTAB = "\\t".ToCharArray();
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39 _escapeBSLASH = "\\\\".ToCharArray();
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40 _escapeQ = "\\\"".ToCharArray();
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41 }
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42
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43 public JSONWriter(TextWriter writer) {
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44 Safe.ArgumentNotNull(writer, "writer");
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45 m_writer = writer;
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46 }
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47
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48 public JSONWriter(TextWriter writer, bool indent) {
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49 Safe.ArgumentNotNull(writer, "writer");
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50
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51 m_writer = writer;
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52 m_indent = indent;
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53 }
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54
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55 void WriteIndent() {
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56 if (m_indent) {
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57 var indent = new char[m_contextStack.Count * m_indentSize + 1];
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58 indent[0] = '\n';
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59 for (int i = 1; i < indent.Length; i++)
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60 indent[i] = ' ';
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61 m_writer.Write(new String(indent));
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62 } else {
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63 m_writer.Write(' ');
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64 }
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65 }
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66
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67 void WriteMemberName(string name) {
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68 Safe.ArgumentNotEmpty(name, "name");
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69 if (m_context.element != JSONElementContext.Object)
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70 OperationNotApplicable("WriteMember");
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71 if (m_context.needComma)
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72 m_writer.Write(",");
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73
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74 WriteIndent();
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75 m_context.needComma = true;
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76 Write(name);
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77 m_writer.Write(" : ");
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78 }
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79
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80 public void WriteValue(string name, string value) {
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81 WriteMemberName(name);
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82 Write(value);
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83 }
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84
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85 public void WriteValue(string name, bool value) {
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86 WriteMemberName(name);
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87 Write(value);
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88 }
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89
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90 public void WriteValue(string name, double value) {
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91 WriteMemberName(name);
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92 Write(value);
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93 }
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94
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95 public void WriteValue(string value) {
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96 if (m_context.element == JSONElementContext.Array) {
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97
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98 if (m_context.needComma)
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99 m_writer.Write(",");
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100 WriteIndent();
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101 m_context.needComma = true;
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102
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103 Write(value);
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104 } else if (m_context.element == JSONElementContext.None) {
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105 Write(value);
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106 m_context.element = JSONElementContext.Closed;
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107 } else {
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108 OperationNotApplicable("WriteValue");
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109 }
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110 }
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111
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112 public void WriteValue(bool value) {
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113 if (m_context.element == JSONElementContext.Array) {
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114
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115 if (m_context.needComma)
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116 m_writer.Write(",");
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117 WriteIndent();
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118 m_context.needComma = true;
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119
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120 Write(value);
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121 } else if (m_context.element == JSONElementContext.None) {
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122 Write(value);
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123 m_context.element = JSONElementContext.Closed;
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124 } else {
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125 OperationNotApplicable("WriteValue");
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126 }
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127 }
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128
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129 public void WriteValue(double value) {
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130 if (m_context.element == JSONElementContext.Array) {
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131
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132 if (m_context.needComma)
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133 m_writer.Write(",");
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134 WriteIndent();
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135 m_context.needComma = true;
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136
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137 Write(value);
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138 } else if (m_context.element == JSONElementContext.None) {
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139 Write(value);
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140 m_context.element = JSONElementContext.Closed;
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141 } else {
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142 OperationNotApplicable("WriteValue");
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143 }
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144 }
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145
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146 public void BeginObject() {
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147 if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array)
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148 OperationNotApplicable("BeginObject");
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149 if (m_context.needComma)
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150 m_writer.Write(",");
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151
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152 WriteIndent();
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153
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154 m_context.needComma = true;
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155
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156 m_contextStack.Push(m_context);
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157
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158 m_context = new Context { element = JSONElementContext.Object, needComma = false };
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159 m_writer.Write("{");
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160 }
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161
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162 public void BeginObject(string name) {
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163 WriteMemberName(name);
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164
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165 m_contextStack.Push(m_context);
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166
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167 m_context = new Context { element = JSONElementContext.Object, needComma = false };
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168 m_writer.Write("{");
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169 }
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170
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171 public void EndObject() {
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172 if (m_context.element != JSONElementContext.Object)
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173 OperationNotApplicable("EndObject");
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174
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175 m_context = m_contextStack.Pop();
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176 if (m_contextStack.Count == 0)
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177 m_context.element = JSONElementContext.Closed;
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178 WriteIndent();
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179 m_writer.Write("}");
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180 }
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181
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182 public void BeginArray() {
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183 if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array)
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184 throw new InvalidOperationException();
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185 if (m_context.needComma) {
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186 m_writer.Write(",");
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187
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188 }
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189 m_context.needComma = true;
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190
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191 WriteIndent();
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192 m_contextStack.Push(m_context);
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193 m_context = new Context { element = JSONElementContext.Array, needComma = false };
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194 m_writer.Write("[");
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195 }
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196
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197 public void BeginArray(string name) {
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198 WriteMemberName(name);
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199
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200 m_contextStack.Push(m_context);
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201
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202 m_context = new Context { element = JSONElementContext.Array, needComma = false };
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203 m_writer.Write("[");
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204 }
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205
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206 public void EndArray() {
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207 if (m_context.element != JSONElementContext.Array)
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208 OperationNotApplicable("EndArray");
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209
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210 m_context = m_contextStack.Pop();
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211 if (m_contextStack.Count == 0)
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212 m_context.element = JSONElementContext.Closed;
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213 WriteIndent();
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214 m_writer.Write("]");
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215 }
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216
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217 void Write(bool value) {
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218 m_writer.Write(value ? "true" : "false");
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219 }
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220
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221 void FlushBuffer() {
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222 if (m_bufferPos > 0) {
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223 m_writer.Write(m_buffer, 0, m_bufferPos);
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224 m_bufferPos = 0;
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225 }
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226 }
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227
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228 void Write(string value) {
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229 if (value == null) {
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230 m_writer.Write("null");
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231 return;
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232 }
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233
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234 Debug.Assert(m_bufferPos == 0);
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235
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236 var chars = value.ToCharArray();
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237 m_buffer[m_bufferPos++] = '"';
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238
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239 // Analysis disable once ForCanBeConvertedToForeach
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240 for (int i = 0; i < chars.Length; i++) {
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241 var ch = chars[i];
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242
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243 char[] escapeSeq;
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244
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245 switch (ch) {
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246 case '\b':
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247 escapeSeq = _escapeBKS;
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248 break;
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249 case '\f':
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250 escapeSeq = _escapeFWD;
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251 break;
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252 case '\r':
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253 escapeSeq = _escapeCR;
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254 break;
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255 case '\n':
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256 escapeSeq = _escapeNL;
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257 break;
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258 case '\t':
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259 escapeSeq = _escapeTAB;
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260 break;
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261 case '\\':
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262 escapeSeq = _escapeBSLASH;
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263 break;
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264 case '"':
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265 escapeSeq = _escapeQ;
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266 break;
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267 default:
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268 if (ch < 0x20) {
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269 if (m_bufferPos + 6 > BUFFER_SIZE)
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270 FlushBuffer();
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271
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272 m_buffer[m_bufferPos++] = '\\';
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273 m_buffer[m_bufferPos++] = 'u';
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274 m_buffer[m_bufferPos++] = '0';
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275 m_buffer[m_bufferPos++] = '0';
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276 m_buffer[m_bufferPos++] = _hex[ch >> 4 & 0xf];
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277 m_buffer[m_bufferPos++] = _hex[ch & 0xf];
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278
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279 } else {
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280 if (m_bufferPos >= BUFFER_SIZE)
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281 FlushBuffer();
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282 m_buffer[m_bufferPos++] = ch;
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283 }
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284 continue;
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285 }
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286
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287 if (m_bufferPos + escapeSeq.Length > BUFFER_SIZE)
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288 FlushBuffer();
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289
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290 Array.Copy(escapeSeq, 0, m_buffer, m_bufferPos, escapeSeq.Length);
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291 m_bufferPos += escapeSeq.Length;
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292
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293 }
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294
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295 if (m_bufferPos >= BUFFER_SIZE)
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296 FlushBuffer();
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297
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298 m_buffer[m_bufferPos++] = '"';
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299
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300 FlushBuffer();
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301 }
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302
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303 void Write(double value) {
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304 if (double.IsNaN(value))
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305 Write("NaN");
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306 else if (double.IsNegativeInfinity(value))
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307 Write("-Infinity");
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308 else if (double.IsPositiveInfinity(value))
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309 Write("Infinity");
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310 else
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311 m_writer.Write(value.ToString(CultureInfo.InvariantCulture));
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312 }
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313
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314 void OperationNotApplicable(string opName) {
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315 throw new InvalidOperationException(String.Format("The operation '{0}' isn't applicable in the context of '{1}'", opName, m_context.element ));
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316 }
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317
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318 }
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319 }
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