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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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6 public class TypeReferenceParser {
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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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23 readonly Regex _tokens = new Regex(@"(\w+)|\s*([\.{},])\s*");
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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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31 readonly string m_text;
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32
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33 TokenType Token { get { return m_token; } }
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34
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35 string TokenValue { get { return m_tokenValue; } }
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36
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37 public TypeReferenceParser(string text) {
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38 Safe.ArgumentNotEmpty(text, nameof(text));
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39 m_text = text;
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40 }
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41
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42 bool ReadToken() {
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43 if (m_pos >= m_text.Length) {
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44 m_token = TokenType.Eof;
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45 m_tokenValue = null;
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46 return false;
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47 }
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48
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49 var m = _tokens.Match(m_text, m_pos);
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50
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51 if (m.Success) {
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52 m_pos += m.Length;
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53 if (m.Groups[1].Success) {
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54 m_token = TokenType.Word;
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55 m_tokenValue = m.Groups[1].Value;
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56 } else if (m.Groups[2].Success) {
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57 m_tokenValue = null;
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58 switch (m.Groups[2].Value) {
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59 case "{":
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60 m_token = TokenType.OpenList;
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61 break;
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62 case "}":
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63 m_token = TokenType.CloseList;
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64 break;
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65 case ".":
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66 m_token = TokenType.Dot;
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67 break;
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68 case ",":
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69 m_token = TokenType.Comma;
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70 break;
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71 }
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72 }
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73 return true;
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74 }
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75 throw new FormatException($"Failed to parse '{m_text}' at pos {m_pos}");
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76 }
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77
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78 public TypeRerefence Pase() {
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79
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80 }
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81
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82 string[] ReadTypeName() {
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83 var parts = new List<string>();
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84
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85 string current = null;
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86 bool stop = false;
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87 while ((!stop) && ReadToken()) {
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88 switch (Token) {
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89 case TokenType.Word:
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90 if (current != null)
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91 ThrowUnexpectedToken();
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92 current = TokenValue;
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93 break;
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94 case TokenType.Dot:
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95 if (current == null)
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96 ThrowUnexpectedToken();
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97 parts.Add(current);
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98 current = null;
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99 break;
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100 default:
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101 stop = true;
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102 break;
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103 }
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104 }
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105 if (current != null)
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106 parts.Add(current);
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107
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108 if (parts.Count == 0)
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109 return null;
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110
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111 return parts.ToArray();
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112 }
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113
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114 TypeReference ReadTypeReference() {
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115
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116 var parts = ReadTypeName();
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117 if (parts == null)
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118 return null;
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119
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120 var typeReference = new TypeReference {
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121 Namespace = string.Join(",", parts, 0, parts.Length - 1),
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122 TypeName = parts[parts.Length - 1]
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123 };
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124
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125 switch (Token) {
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126 case TokenType.Eof:
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127 break;
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128 case TokenType.OpenList:
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129 typeReference.GenericParameters = ReadTypeReferenceList();
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130 if(Token != TokenType.CloseList)
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131 ThrowUnexpectedToken();
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132 break;
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133 default:
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134 ThrowUnexpectedToken();
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135 break;
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136 }
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137
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138 return typeReference;
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139 }
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140
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141 TypeReference[] ReadTypeReferenceList() {
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142 throw new NotImplementedException();
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143 }
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144
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145 void ReadDot() {
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146 if (!ReadToken() || Token != TokenType.Dot)
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147 ThrowUnexpectedToken();
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148 }
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149
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150 void ThrowUnexpectedToken() {
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151 throw new FormatException($"Unexpected '{Token}' at {m_pos}");
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152 }
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153
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154
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155 }
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156 } |
