Mercurial > pub > ImplabNet

annotate Implab.ServiceHost/Unity/TypeReferenceParser.cs @ 281:e0916ddc9950 v3 tip

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code cleanup and refactoring
author cin
date Fri, 01 Jun 2018 21:35:24 +0300
parents 6691aff01de1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text.RegularExpressions;
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5
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6 namespace Implab.ServiceHost.Unity {
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7 internal class TypeReferenceParser {
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8 enum TokenType {
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9 None,
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10
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11 Word,
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12
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13 Dot,
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14
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15 Comma,
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16
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17 OpenList,
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18
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19 CloseList,
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20
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21 OpenArray,
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22
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23 CloseArray,
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24
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25 Plus,
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26
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27 Eof
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28 }
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29
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30 readonly Regex _tokens = new Regex(@"\G(?:([\w]+)|\s*([\+\.{},\[\]])\s*)", RegexOptions.Compiled);
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31
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32 TokenType m_token;
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33
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34 string m_tokenValue;
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35
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36 int m_pos;
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37
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38 int m_tokenPos;
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39
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40 readonly string m_text;
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41
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42 TokenType Token { get { return m_token; } }
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43
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44 string TokenValue { get { return m_tokenValue; } }
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45
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46 int TokenPos { get { return m_tokenPos; } }
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47
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48 public TypeReferenceParser(string text) {
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49 Safe.ArgumentNotEmpty(text, nameof(text));
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50 m_text = text;
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51 }
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52
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53 bool ReadToken() {
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54 if (m_pos >= m_text.Length) {
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55 m_token = TokenType.Eof;
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56 m_tokenValue = null;
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57 return false;
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58 }
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59
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60 var m = _tokens.Match(m_text, m_pos);
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61
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62 if (m.Success) {
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63 m_tokenPos = m_pos;
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64 m_pos += m.Length;
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65 if (m.Groups[1].Success) {
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66 m_token = TokenType.Word;
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67 m_tokenValue = m.Groups[1].Value;
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68 } else if (m.Groups[2].Success) {
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69 m_tokenValue = null;
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70 switch (m.Groups[2].Value) {
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71 case "{":
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72 m_token = TokenType.OpenList;
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73 break;
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74 case "}":
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75 m_token = TokenType.CloseList;
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76 break;
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77 case ".":
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78 m_token = TokenType.Dot;
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79 break;
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80 case ",":
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81 m_token = TokenType.Comma;
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82 break;
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83 case "[":
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84 m_token = TokenType.OpenArray;
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85 break;
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86 case "]":
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87 m_token = TokenType.CloseArray;
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88 break;
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89 case "+":
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90 m_token = TokenType.Plus;
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91 break;
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92 }
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93 }
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94 return true;
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95 }
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96 throw new FormatException($"Failed to parse '{m_text}' at pos {m_pos}");
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97 }
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98
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99 public TypeReference Parse() {
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100 var result = ReadTypeReference();
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101 if (Token != TokenType.Eof)
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102 ThrowUnexpectedToken();
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103 return result;
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104 }
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105
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106 string[] ReadQTypeName() {
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107 var parts = new List<string>();
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108
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109 string current = null;
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110 bool stop = false;
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111 while ((!stop) && ReadToken()) {
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112 switch (Token) {
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113 case TokenType.Word:
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114 if (current != null)
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115 ThrowUnexpectedToken();
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116 current = TokenValue;
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117 break;
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118 case TokenType.Dot:
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119 if (current == null)
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120 ThrowUnexpectedToken();
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121 parts.Add(current);
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122 current = null;
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123 break;
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124 default:
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125 stop = true;
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126 break;
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127 }
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128 }
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129 if (current != null)
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130 parts.Add(current);
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131
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132 if (parts.Count == 0)
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133 return null;
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134
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135 return parts.ToArray();
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136 }
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137
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138 string ReadNQTypeName() {
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139 ReadToken();
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140 if (Token != TokenType.Word)
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141 ThrowUnexpectedToken();
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142 return TokenValue;
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143 }
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144
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145 TypeReference ReadTypeReference() {
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146
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147 var parts = ReadQTypeName();
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148 if (parts == null)
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149 return null;
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150
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151 var genericParameters = ReadGenericParams();
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152
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153 var typeReference = TypeReference.Create(
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154 string.Join(".", parts, 0, parts.Length - 1),
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155 parts[parts.Length - 1],
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156 genericParameters.Length
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157 );
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158
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159 if (genericParameters.Length > 0 && genericParameters.All(x => x != null))
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160 typeReference = typeReference.MakeGenericType(genericParameters);
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161
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162 typeReference = ReadArraySpec(typeReference);
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163
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164 if(Token == TokenType.Plus)
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165 return ReadNestedType(typeReference);
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166
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167 return typeReference;
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168 }
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169
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170 TypeReference ReadNestedType(TypeReference declaringType) {
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171 var name = ReadNQTypeName();
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172 if(string.IsNullOrEmpty(name))
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173 throw new FormatException("Nested type name can't be empty");
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174 ReadToken();
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175
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176 var genericParameters = ReadGenericParams();
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177
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178 var typeReference = declaringType.Create(
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179 name,
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180 genericParameters.Length
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181 );
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182
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183 if (genericParameters.Length > 0 && genericParameters.All(x => x != null))
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184 typeReference = typeReference.MakeGenericType(genericParameters);
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185
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186 typeReference = ReadArraySpec(typeReference);
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187
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188 if(Token == TokenType.Plus)
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189 return ReadNestedType(typeReference);
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190
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191 return typeReference;
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192 }
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193
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194 TypeReference[] ReadGenericParams() {
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195 if (Token == TokenType.OpenList) {
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196 var genericParameters = ReadTypeReferenceList();
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197 if (Token != TokenType.CloseList)
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198 ThrowUnexpectedToken();
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199 ReadToken();
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200
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201 return genericParameters;
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202 }
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
203
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
204 return Array.Empty<TypeReference>();
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
205 }
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
206
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
207 TypeReference ReadArraySpec(TypeReference typeReference) {
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
208 while (Token == TokenType.OpenArray) {
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
209 var rank = CountRank();
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
210 if (Token != TokenType.CloseArray)
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
211 ThrowUnexpectedToken();
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
212
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
213 typeReference = typeReference.MakeArrayType(rank);
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
214
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
215 ReadToken();
267
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
216 }
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
217
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
218 return typeReference;
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
219 }
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
220
278
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
221 int CountRank() {
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
222 int rank = 0;
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
223 do {
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
224 rank++;
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
225 } while(ReadToken() && Token == TokenType.Comma);
6691aff01de1 Implab: added XmlDefaultSeializer (SerializersPool is now obsolete)
cin
parents: 277
diff changeset
226 return rank;
277
963b17c275be Refactoring
cin
parents: 269
diff changeset
227 }
963b17c275be Refactoring
cin
parents: 269
diff changeset
228
267
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
229 TypeReference[] ReadTypeReferenceList() {
268
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
230 var list = new List<TypeReference>();
267
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
231
268
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
232 do {
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
233 var typeReference = ReadTypeReference();
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
234 list.Add(typeReference);
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
235 } while (Token == TokenType.Comma);
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
236
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
237 return list.ToArray();
267
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
238 }
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
239
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
240 void ThrowUnexpectedToken() {
268
0be8a6ae8307 Implemented typereference parser
cin
parents: 267
diff changeset
241 throw new FormatException($"Unexpected '{Token}' at pos {TokenPos}: -->{m_text.Substring(TokenPos, Math.Min(m_text.Length - TokenPos, 10))}");
267
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
242 }
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
243
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
244 }
6b3e5c48131b Working on Unity xml configuration
cin
parents:
diff changeset
245 }