1 | using System;
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2 | using System.Text;
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3 | using System.Text.RegularExpressions;
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4 | using System.Reflection.Emit;
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5 | using System.Collections.Generic;
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6 |
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7 | namespace HeuristicLab.Persistence.Auxiliary {
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8 |
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9 | public class ParseError : Exception {
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10 | public ParseError(string message) : base(message) { }
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11 | }
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12 |
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13 | public class TypeNameParser {
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14 |
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15 | /*
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16 | TypeSpec := SimpleTypeSpec '&'?
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17 |
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18 | SimpleTypeSpec := (IDENTIFIER '.')*
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19 | (IDENTIFIER '+')*
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20 | IDENTIFIER
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21 | ( '`\d+[' Generics ']' )?
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22 | (\*|\[(\d+\.\.\d+|\d+\.\.\.|(|\*)(,(|\*))*)\])*
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23 | (',\s*' IDENTIFIER (',\s*' AssemblyProperty)* )?
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24 |
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25 | Generics := '[' SimpleTypeSpec ']' (',[' SimpleTypeSpec ']')
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26 |
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27 | AssemblyProperty := 'Version=' Version
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28 | | 'PublicKey(Token)?=[a-fA-F0-9]+'
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29 | | 'Culture=[a-zA-F0-9]+'
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30 |
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31 | Version := '\d+\.\d+\.\d+\.\d+)'
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32 |
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33 | IDENTIFIER = [_a-zA-Z][_a-ZA-Z0-9]*
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34 | */
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35 |
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36 |
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37 | class Token {
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38 | private static Dictionary<string, string> tokens =
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39 | new Dictionary<string, string> {
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40 | {"-", "DASH"},
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41 | {"&", "AMPERSAND"},
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42 | {".", "DOT"},
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43 | {"+", "PLUS"},
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44 | {",", "COMMA"},
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45 | {"[", "OPEN_BRACKET"},
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46 | {"]", "CLOSE_BRACKET"},
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47 | {"*", "ASTERISK"},
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48 | {" ", "SPACE"},
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49 | {"=", "EQUALS"},
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50 | {"`", "BACKTICK"} };
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51 | private static Regex NumberRegex = new Regex("^\\d+$");
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52 | private static Regex TokenRegex = new Regex("[-&.+,\\[\\]* =`]|\\d+|[_a-zA-Z][_a-zA-Z0-9]*");
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53 | public string Name { get; private set; }
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54 | public string Value { get; private set; }
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55 | public int? Number { get; private set; }
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56 | public int Position { get; private set; }
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57 | private Token(string value, int pos) {
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58 | Position = pos;
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59 | if (tokens.ContainsKey(value)) {
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60 | Name = tokens[value];
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61 | } else if (NumberRegex.IsMatch(value)) {
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62 | Number = int.Parse(value);
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63 | } else {
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64 | Value = value;
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65 | }
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66 | }
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67 | public static IEnumerable<Token> Tokenize(string s) {
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68 | int pos = 0;
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69 | foreach (Match m in TokenRegex.Matches(s)) {
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70 | yield return new Token(m.Value, pos);
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71 | pos += m.Length;
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72 | }
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73 | }
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74 | public override string ToString() {
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75 | if (Name != null)
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76 | return "Token(" + Name + ")";
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77 | if (Value != null)
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78 | return "\"" + Value + "\"";
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79 | if (Number != null)
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80 | return Number.ToString();
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81 | return "<empty>";
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82 | }
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83 | }
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84 |
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85 | private Queue<Token> tokens;
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86 | private int Position {
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87 | get {
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88 | if (tokens.Count == 0)
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89 | return -1;
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90 | else
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91 | return tokens.Peek().Position;
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92 | }
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93 | }
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94 |
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95 | private TypeNameParser(string s) {
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96 | tokens = new Queue<Token>(Token.Tokenize(s));
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97 | }
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98 |
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99 | public static TypeName Parse(string s) {
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100 | TypeNameParser p = new TypeNameParser(s);
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101 | try {
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102 | return p.TransformTypeSpec();
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103 | } catch (ParseError x) {
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104 | if (p.Position > 0)
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105 | throw new ParseError(String.Format(
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106 | "Could not parse typename: {0}\n\"{1}====>{2}<===={3}",
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107 | x.Message,
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108 | s.Substring(0, p.Position),
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109 | s[p.Position],
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110 | s.Substring(p.Position, s.Length - p.Position)));
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111 | else
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112 | throw new ParseError(String.Format(
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113 | "Could not parse typenname \"{0}\" at end of input: {1}",
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114 | s,
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115 | x.Message));
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116 | }
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117 | }
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118 |
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119 | private TypeName TransformTypeSpec() {
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120 | TypeName t = TransformSimpleTypeSpec();
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121 | t.IsReference = ConsumeToken("AMPERSAND");
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122 | return t;
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123 | }
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124 |
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125 | private TypeName TransformSimpleTypeSpec() {
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126 | List<string> nameSpace = new List<string>();
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127 | nameSpace.Add(ConsumeIdentifier());
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128 | while (ConsumeToken("DOT"))
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129 | nameSpace.Add(ConsumeIdentifier());
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130 | List<string> className = new List<string>();
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131 | if (nameSpace.Count > 0) {
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132 | className.Add(nameSpace[nameSpace.Count - 1]);
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133 | nameSpace.RemoveAt(nameSpace.Count - 1);
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134 | }
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135 | while (ConsumeToken("PLUS"))
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136 | className.Add(ConsumeIdentifier());
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137 | TypeName typeName = new TypeName(
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138 | string.Join(".", nameSpace.ToArray()),
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139 | string.Join("+", className.ToArray()));
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140 | if (ConsumeToken("BACKTICK")) {
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141 | int nGenericArgs = ConsumeNumber();
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142 | if (ConsumeToken("OPEN_BRACKET") &&
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143 | CanConsumeToken("OPEN_BRACKET")) {
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144 | typeName.GenericArgs.AddRange(TransformGenerics());
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145 | ConsumeToken("CLOSE_BRACKET", true);
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146 | }
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147 | }
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148 | StringBuilder pointerOrArray = new StringBuilder();
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149 | while (true) {
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150 | if (ConsumeToken("ASTERSIK")) {
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151 | pointerOrArray.Append("*");
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152 | } else if (ConsumeToken("OPEN_BRACKET")) {
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153 | pointerOrArray.Append('[');
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154 | ParseDimension(pointerOrArray);
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155 | while (ConsumeToken("COMMA")) {
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156 | pointerOrArray.Append(",");
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157 | ParseDimension(pointerOrArray);
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158 | }
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159 | ConsumeToken("CLOSE_BRACKET", true);
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160 | pointerOrArray.Append(']');
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161 | } else {
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162 | break;
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163 | }
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164 | }
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165 | typeName.MemoryMagic = pointerOrArray.ToString();
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166 | if (ConsumeComma()) {
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167 | StringBuilder sb = new StringBuilder();
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168 | sb.Append(ConsumeIdentifier());
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169 | while (CanConsumeToken("DOT") ||
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170 | CanConsumeToken("DASH") ||
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171 | CanConsumeNumber() ||
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172 | CanConsumeIdentifier()) {
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173 | if (ConsumeToken("DOT"))
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174 | sb.Append('.');
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175 | else if (ConsumeToken("DASH"))
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176 | sb.Append('-');
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177 | else if (CanConsumeNumber())
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178 | sb.Append(ConsumeNumber());
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179 | else
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180 | sb.Append(ConsumeIdentifier());
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181 | }
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182 | typeName.AssemblyName = sb.ToString();
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183 | while (ConsumeComma()) {
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184 | KeyValuePair<string, string> property =
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185 | TransformAssemblyProperty();
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186 | typeName.AssemblyAttribues.Add(property.Key, property.Value);
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187 | }
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188 | }
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189 | return typeName;
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190 | }
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191 |
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192 | private void ParseDimension(StringBuilder sb) {
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193 | if (ConsumeToken("ASTERSIK")) {
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194 | sb.Append("*");
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195 | } else if (CanConsumeNumber()) {
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196 | sb.Append(ConsumeNumber());
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197 | ConsumeToken("DOT", true);
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198 | ConsumeToken("DOT", true);
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199 | if (ConsumeToken("DOT")) {
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200 | sb.Append("...");
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201 | } else {
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202 | sb.Append("..").Append(ConsumeNumber());
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203 | }
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204 | }
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205 | }
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206 |
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207 | private IEnumerable<TypeName> TransformGenerics() {
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208 | ConsumeToken("OPEN_BRACKET", true);
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209 | yield return TransformSimpleTypeSpec();
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210 | ConsumeToken("CLOSE_BRACKET", true);
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211 | while (ConsumeToken("COMMA")) {
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212 | ConsumeToken("OPEN_BRACKET", true);
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213 | yield return TransformSimpleTypeSpec();
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214 | ConsumeToken("CLOSE_BRACKET", true);
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215 | }
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216 | }
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217 |
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218 | private KeyValuePair<string, string> TransformAssemblyProperty() {
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219 | if (ConsumeIdentifier("Version")) {
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220 | ConsumeToken("EQUALS", true);
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221 | return new KeyValuePair<string, string>(
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222 | "Version",
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223 | TransformVersion());
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224 | } else if (ConsumeIdentifier("PublicKey")) {
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225 | return ConsumeAssignment("PublicKey");
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226 | } else if (ConsumeIdentifier("PublicKeyToken")) {
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227 | return ConsumeAssignment("PublicKeyToken");
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228 | } else if (ConsumeIdentifier("Culture")) {
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229 | return ConsumeAssignment("Culture");
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230 | } else if (ConsumeIdentifier("Custom")) {
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231 | return ConsumeAssignment("Custom");
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232 | } else {
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233 | throw new ParseError(String.Format(
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234 | "Invalid assembly property \"{0}\"",
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235 | tokens.Peek().ToString()));
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236 | }
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237 | }
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238 |
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239 | private KeyValuePair<string, string> ConsumeAssignment(string name) {
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240 | ConsumeToken("EQUALS", true);
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241 | return new KeyValuePair<string, string>(name, ConsumeIdentifier());
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242 | }
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243 |
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244 | private string TransformVersion() {
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245 | StringBuilder version = new StringBuilder();
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246 | version.Append(ConsumeNumber());
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247 | ConsumeToken("DOT");
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248 | version.Append('.').Append(ConsumeNumber());
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249 | ConsumeToken("DOT");
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250 | version.Append('.').Append(ConsumeNumber());
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251 | ConsumeToken("DOT");
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252 | version.Append('.').Append(ConsumeNumber());
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253 | return version.ToString();
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254 | }
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255 |
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256 | private bool CanConsumeNumber() {
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257 | if (tokens.Count == 0)
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258 | return false;
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259 | return tokens.Peek().Number != null;
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260 | }
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261 |
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262 | private int ConsumeNumber() {
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263 | if (tokens.Count == 0)
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264 | throw new ParseError("End of input while expecting number");
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265 | if (tokens.Peek().Number != null)
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266 | return (int)tokens.Dequeue().Number;
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267 | throw new ParseError(string.Format(
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268 | "Number expected, found \"{0}\" instead",
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269 | tokens.Peek().ToString()));
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270 | }
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271 |
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272 | private bool ConsumeIdentifier(string value) {
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273 | if (tokens.Count == 0)
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274 | return false;
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275 | if (tokens.Peek().Value == value) {
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276 | tokens.Dequeue();
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277 | return true;
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278 | } else {
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279 | return false;
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280 | }
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281 | }
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282 |
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283 | private bool CanConsumeIdentifier() {
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284 | return tokens.Count > 0 && tokens.Peek().Value != null;
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285 | }
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286 |
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287 | private string ConsumeIdentifier() {
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288 | if (tokens.Count == 0)
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289 | throw new ParseError("End of input while expecting identifier");
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290 | if (tokens.Peek().Value != null)
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291 | return tokens.Dequeue().Value;
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292 | throw new ParseError(String.Format(
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293 | "Identifier expected, found \"{0}\" instead",
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294 | tokens.Peek().ToString()));
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295 | }
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296 |
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297 | private bool ConsumeComma() {
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298 | if (ConsumeToken("COMMA")) {
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299 | while (ConsumeToken("SPACE")) ;
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300 | return true;
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301 | } else {
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302 | return false;
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303 | }
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304 | }
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305 |
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306 | private bool ConsumeToken(string name) {
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307 | return ConsumeToken(name, false);
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308 | }
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309 |
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310 | private bool CanConsumeToken(string name) {
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311 | if (tokens.Count == 0)
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312 | return false;
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313 | if (tokens.Peek().Name == name)
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314 | return true;
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315 | return false;
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316 | }
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317 |
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318 | private bool ConsumeToken(string name, bool force) {
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319 | if (tokens.Count == 0)
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320 | if (force)
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321 | throw new ParseError(String.Format(
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322 | "end of input while expecting token \"{0}\"",
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323 | name));
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324 | else
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325 | return false;
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326 | if (tokens.Peek().Name == name) {
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327 | tokens.Dequeue();
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328 | return true;
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329 | } else if (force) {
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330 | throw new ParseError(String.Format(
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331 | "expected \"{0}\" found \"{1}\"",
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332 | name,
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333 | tokens.Peek().ToString()));
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334 | } else {
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335 | return false;
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336 | }
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337 | }
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338 | }
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339 | } |
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