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267
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Text.RegularExpressions;
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4
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5 namespace Implab.ServiceHost.Unity {
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268
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6 internal class TypeReferenceParser {
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267
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7 enum TokenType {
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8 None,
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9
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10 Word,
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11
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12 Dot,
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13
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14 Comma,
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15
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16 OpenList,
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17
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18 CloseList,
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19
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20 Eof
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21 }
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22
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268
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23 readonly Regex _tokens = new Regex(@"(\w+)|\s*([\.{},\+])\s*");
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267
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24
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25 TokenType m_token;
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26
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27 string m_tokenValue;
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28
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29 int m_pos;
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30
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268
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31 int m_tokenPos;
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32
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267
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33 readonly string m_text;
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34
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35 TokenType Token { get { return m_token; } }
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36
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37 string TokenValue { get { return m_tokenValue; } }
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38
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268
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39 int TokenPos { get { return m_tokenPos; } }
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40
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41 public TypeReferenceParser(string text) {
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42 Safe.ArgumentNotEmpty(text, nameof(text));
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43 m_text = text;
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44 }
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45
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46 bool ReadToken() {
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47 if (m_pos >= m_text.Length) {
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48 m_token = TokenType.Eof;
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49 m_tokenValue = null;
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50 return false;
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51 }
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52
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53 var m = _tokens.Match(m_text, m_pos);
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54
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55 if (m.Success) {
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268
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56 m_tokenPos = m_pos;
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267
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57 m_pos += m.Length;
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58 if (m.Groups[1].Success) {
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59 m_token = TokenType.Word;
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60 m_tokenValue = m.Groups[1].Value;
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61 } else if (m.Groups[2].Success) {
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62 m_tokenValue = null;
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63 switch (m.Groups[2].Value) {
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64 case "{":
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65 m_token = TokenType.OpenList;
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66 break;
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67 case "}":
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68 m_token = TokenType.CloseList;
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69 break;
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70 case ".":
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268
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71 case "+":
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267
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72 m_token = TokenType.Dot;
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73 break;
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74 case ",":
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75 m_token = TokenType.Comma;
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76 break;
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77 }
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78 }
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79 return true;
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80 }
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81 throw new FormatException($"Failed to parse '{m_text}' at pos {m_pos}");
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82 }
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83
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268
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84 public TypeReference Parse() {
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85 var result = ReadTypeReference();
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86 if (ReadToken())
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87 ThrowUnexpectedToken();
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88 return result;
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267
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89 }
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90
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91 string[] ReadTypeName() {
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92 var parts = new List<string>();
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93
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94 string current = null;
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95 bool stop = false;
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96 while ((!stop) && ReadToken()) {
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97 switch (Token) {
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98 case TokenType.Word:
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99 if (current != null)
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100 ThrowUnexpectedToken();
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101 current = TokenValue;
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102 break;
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103 case TokenType.Dot:
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104 if (current == null)
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105 ThrowUnexpectedToken();
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106 parts.Add(current);
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107 current = null;
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108 break;
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109 default:
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110 stop = true;
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111 break;
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112 }
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113 }
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114 if (current != null)
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115 parts.Add(current);
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116
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117 if (parts.Count == 0)
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118 return null;
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119
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120 return parts.ToArray();
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121 }
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122
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123 TypeReference ReadTypeReference() {
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124
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125 var parts = ReadTypeName();
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126 if (parts == null)
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127 return null;
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128
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129 var typeReference = new TypeReference {
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268
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130 Namespace = string.Join(".", parts, 0, parts.Length - 1),
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131 TypeName = parts[parts.Length - 1]
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132 };
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267
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133
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134 switch (Token) {
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135 case TokenType.OpenList:
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136 typeReference.GenericParameters = ReadTypeReferenceList();
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268
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137 if (Token != TokenType.CloseList)
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267
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138 ThrowUnexpectedToken();
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268
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139 ReadToken();
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140 break;
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141 }
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142
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143 return typeReference;
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144 }
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145
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146 TypeReference[] ReadTypeReferenceList() {
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268
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147 var list = new List<TypeReference>();
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267
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148
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268
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149 do {
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150 var typeReference = ReadTypeReference();
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151 list.Add(typeReference);
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152 } while (Token == TokenType.Comma);
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153
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154 return list.ToArray();
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267
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155 }
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156
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157 void ThrowUnexpectedToken() {
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268
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158 throw new FormatException($"Unexpected '{Token}' at pos {TokenPos}: -->{m_text.Substring(TokenPos, Math.Min(m_text.Length - TokenPos, 10))}");
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267
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159 }
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160
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161 }
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162 } |
