annotate Implab/JSON/JSONWriter.cs @ 72:d67b95eddaf4 v2

promises refactoring
author cin
date Thu, 04 Sep 2014 18:47:12 +0400
parents c0bf853aa04f
children ffd3702968c7
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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.Linq;
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5 using System.Text;
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6 using System.Threading.Tasks;
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7
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8 namespace Implab.JSON {
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9 public class JSONWriter {
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10 struct Context {
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11 public bool needComma;
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12 public JSONElementContext element;
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13 }
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14 Stack<Context> m_contextStack = new Stack<Context>();
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15 Context m_context;
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16
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17 TextWriter m_writer;
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18 readonly bool m_indent = true;
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19 readonly int m_indentSize = 4;
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20
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21 static readonly char [] _escapeBKS,
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22 _escapeFWD,
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23 _escapeCR,
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24 _escapeNL,
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25 _escapeTAB,
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26 _escapeSLASH,
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27 _escapeBSLASH,
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28 _escapeQ;
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29
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30 static JSONWriter() {
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31 _escapeBKS = "\\b".ToCharArray();
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32 _escapeFWD = "\\f".ToCharArray();
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33 _escapeCR = "\\r".ToCharArray();
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34 _escapeNL = "\\n".ToCharArray();
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35 _escapeTAB = "\\t".ToCharArray();
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36 _escapeBSLASH = "\\\\".ToCharArray();
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37 _escapeSLASH = "\\/".ToCharArray();
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38 _escapeQ = "\\\"".ToCharArray();
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39 }
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40
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41 public JSONWriter(TextWriter writer) {
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42 Safe.ArgumentNotNull(writer, "writer");
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43
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44 m_writer = writer;
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45 }
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46
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47 public JSONWriter(TextWriter writer, bool indent) {
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48 Safe.ArgumentNotNull(writer, "writer");
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49
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50 m_writer = writer;
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51 m_indent = indent;
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52 }
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53
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54 void WriteIndent() {
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55 if (m_indent) {
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56 var indent = new char[m_contextStack.Count * m_indentSize + 1];
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57 indent[0] = '\n';
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58 for (int i = 1; i < indent.Length; i++)
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59 indent[i] = ' ';
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60 m_writer.Write(new String(indent));
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61 } else {
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62 m_writer.Write(' ');
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63 }
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64 }
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65
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66 void WriteMemberName(string name) {
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67 Safe.ArgumentNotEmpty(name, "name");
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68 if (m_context.element != JSONElementContext.Object)
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69 OperationNotApplicable("WriteMember");
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70 if (m_context.needComma)
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71 m_writer.Write(",");
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72
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73 WriteIndent();
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74 m_context.needComma = true;
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75 Write(name);
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76 m_writer.Write(" : ");
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77 }
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78
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79 public void WriteValue(string name, string value) {
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80 WriteMemberName(name);
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81 Write(value);
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82 }
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83
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84 public void WriteValue(string name, bool value) {
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85 WriteMemberName(name);
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86 Write(value);
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87 }
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88
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89 public void WriteValue(string name, double value) {
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90 WriteMemberName(name);
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91 Write(value);
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92 }
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93
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94 public void WriteValue(string value) {
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95 if (m_context.element != JSONElementContext.Array)
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96 OperationNotApplicable("WriteValue");
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97 if (m_context.needComma)
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98 m_writer.Write(",");
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99 WriteIndent();
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100 m_context.needComma = true;
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101
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102 Write(value);
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103 }
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104
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105 public void WriteValue(bool value) {
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106 if (m_context.element != JSONElementContext.Array)
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107 OperationNotApplicable("WriteValue");
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108 if (m_context.needComma)
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109 m_writer.Write(",");
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110 m_context.needComma = true;
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111
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112 WriteIndent();
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113 Write(value);
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114 }
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115
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116 public void WriteValue(double value) {
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117 if (m_context.element != JSONElementContext.Array)
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118 OperationNotApplicable("WriteValue");
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119 if (m_context.needComma)
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120 m_writer.Write(",");
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121 m_context.needComma = true;
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122
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123 WriteIndent();
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124 Write(value);
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125 }
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126
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127 public void BeginObject() {
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128 if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array)
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129 OperationNotApplicable("BeginObject");
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130 if (m_context.needComma)
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131 m_writer.Write(",");
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132
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133 WriteIndent();
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134
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135 m_context.needComma = true;
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136
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137 m_contextStack.Push(m_context);
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138
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139 m_context = new Context { element = JSONElementContext.Object, needComma = false };
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140 m_writer.Write("{");
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141 }
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142
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143 public void BeginObject(string name) {
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144 WriteMemberName(name);
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145
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146 m_contextStack.Push(m_context);
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147
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148 m_context = new Context { element = JSONElementContext.Object, needComma = false };
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149 m_writer.Write("{");
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150 }
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151
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152 public void EndObject() {
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153 if (m_context.element != JSONElementContext.Object)
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154 OperationNotApplicable("EndArray");
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155
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156 m_context = m_contextStack.Pop();
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157 WriteIndent();
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158 m_writer.Write("}");
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159 }
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160
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161 public void BeginArray() {
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162 if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array)
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163 throw new InvalidOperationException();
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164 if (m_context.needComma) {
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165 m_writer.Write(",");
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166
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167 }
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168 m_context.needComma = true;
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169
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170 WriteIndent();
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171 m_contextStack.Push(m_context);
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172 m_context = new Context { element = JSONElementContext.Array, needComma = false };
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173 m_writer.Write("[");
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174 }
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175
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176 public void BeginArray(string name) {
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177 WriteMemberName(name);
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178
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179 m_contextStack.Push(m_context);
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180
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181 m_context = new Context { element = JSONElementContext.Array, needComma = false };
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182 m_writer.Write("[");
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183 }
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184
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185 public void EndArray() {
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186 if (m_context.element != JSONElementContext.Array)
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187 OperationNotApplicable("EndArray");
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188
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189 m_context = m_contextStack.Pop();
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190 WriteIndent();
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191 m_writer.Write("]");
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192 }
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193
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194 void Write(bool value) {
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195 m_writer.Write(value ? "true" : "false");
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196 }
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197
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198
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199 void Write(string value) {
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200 if (value == null)
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201 m_writer.Write("null");
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202
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203 var chars = value.ToCharArray();
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204 m_writer.Write('"');
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205
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206 for (int i = 0; i < chars.Length; i++) {
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207 var ch = chars[i];
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208
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209 switch (ch) {
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210 case '\b':
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211 m_writer.Write(_escapeBKS);
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212 break;
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213 case '\f':
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214 m_writer.Write(_escapeFWD);
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215 break;
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216 case '\r':
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217 m_writer.Write(_escapeCR);
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218 break;
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219 case '\n':
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220 m_writer.Write(_escapeNL);
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221 break;
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222 case '\t':
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223 m_writer.Write(_escapeTAB);
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224 break;
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225 case '\\':
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226 m_writer.Write(_escapeBSLASH);
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227 break;
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228 case '/':
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229 m_writer.Write(_escapeSLASH);
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230 break;
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231 case '"':
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232 m_writer.Write(_escapeQ);
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233 break;
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234 default:
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235 if (ch < 0x20) {
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236 m_writer.Write("\\u00{0:x2}",(int)ch);
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237 } else {
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238 m_writer.Write(ch);
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239 }
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240 break;
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241 }
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242 }
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243
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244 m_writer.Write('"');
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245 }
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246
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247 void Write(double value) {
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248 m_writer.Write(value);
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249 }
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250
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251 void OperationNotApplicable(string opName) {
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252 throw new InvalidOperationException(String.Format("The operation '{0}' isn't applicable in the context of '{1}'", opName, m_context.element ));
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253 }
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254
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255 }
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256 }