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 | /// <summary>
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10 | /// Error during type name parsing, thrown by <see cref="TypeNameParser"/>.
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11 | /// </summary>
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12 | public class ParseError : Exception {
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13 |
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14 | /// <summary>
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15 | /// Initializes a new instance of the <see cref="ParseError"/> class.
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16 | /// </summary>
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17 | /// <param name="message">The message.</param>
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18 | public ParseError(string message) : base(message) { }
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19 | }
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20 |
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21 | /// <summary>
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22 | /// Parse a .NET type name using the following grammar:
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23 | ///
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24 | /// <code>
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25 | /// TypeSpec := SimpleTypeSpec '&'?
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26 | ///
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27 | /// SimpleTypeSpec := (IDENTIFIER '.')*
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28 | /// (IDENTIFIER '+')*
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29 | /// IDENTIFIER
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30 | /// ( '`\d+[' Generics ']' )?
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31 | /// (\*|\[(\d+\.\.\d+|\d+\.\.\.|(|\*)(,(|\*))*)\])*
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32 | /// (',\s*' IDENTIFIER (',\s*' AssemblyProperty)* )?
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33 | ///
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34 | /// Generics := '[' SimpleTypeSpec ']' (',[' SimpleTypeSpec ']')
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35 | ///
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36 | /// AssemblyProperty := 'Version=' Version
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37 | /// | 'PublicKey(Token)?=[a-fA-F0-9]+'
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38 | /// | 'Culture=[a-zA-F0-9]+'
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39 | ///
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40 | /// Version := \d+\.\d+\.\d+\.\d+
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41 | ///
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42 | /// IDENTIFIER = [_a-zA-Z][_a-ZA-Z0-9]*
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43 | /// </code>
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44 | /// </summary>
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45 | public class TypeNameParser {
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46 |
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47 | /*
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48 | TypeSpec := SimpleTypeSpec '&'?
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49 |
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50 | SimpleTypeSpec := (IDENTIFIER '.')*
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51 | (IDENTIFIER '+')*
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52 | IDENTIFIER
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53 | ( '`\d+[' Generics ']' )?
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54 | (\*|\[(\d+\.\.\d+|\d+\.\.\.|(|\*)(,(|\*))*)\])*
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55 | (',\s*' IDENTIFIER (',\s*' AssemblyProperty)* )?
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56 |
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57 | Generics := '[' SimpleTypeSpec ']' (',[' SimpleTypeSpec ']')
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58 |
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59 | AssemblyProperty := 'Version=' Version
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60 | | 'PublicKey(Token)?=[a-fA-F0-9]+'
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61 | | 'Culture=[a-zA-F0-9]+'
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62 |
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63 | Version := \d+\.\d+\.\d+\.\d+
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64 |
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65 | IDENTIFIER = [_a-zA-Z][_a-ZA-Z0-9]*
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66 | */
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67 |
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68 |
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69 | private class Token {
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70 | private static Dictionary<string, string> tokens =
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71 | new Dictionary<string, string> {
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72 | {"-", "DASH"},
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73 | {"&", "AMPERSAND"},
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74 | {".", "DOT"},
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75 | {"+", "PLUS"},
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76 | {",", "COMMA"},
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77 | {"[", "OPEN_BRACKET"},
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78 | {"]", "CLOSE_BRACKET"},
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79 | {"*", "ASTERISK"},
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80 | {" ", "SPACE"},
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81 | {"=", "EQUALS"},
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82 | {"`", "BACKTICK"} };
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83 | private static Regex NumberRegex = new Regex("^\\d+$");
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84 | private static Regex IdentifierRegex = new Regex("^[_a-zA-Z][_a-zA-Z0-9]*$");
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85 | private static Regex TokenRegex = new Regex("[-&.+,\\[\\]* =`]|[a-f0-9]+|\\d+|[_a-zA-Z][_a-zA-Z0-9]*");
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86 | public string Name { get; private set; }
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87 | public string Value { get; private set; }
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88 | public bool IsIdentifier { get; private set; }
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89 | public int? Number { get; private set; }
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90 | public int Position { get; private set; }
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91 | private Token(string value, int pos) {
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92 | Position = pos;
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93 | if (tokens.ContainsKey(value)) {
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94 | Name = tokens[value];
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95 | } else if (NumberRegex.IsMatch(value)) {
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96 | Number = int.Parse(value);
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97 | } else {
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98 | Value = value;
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99 | IsIdentifier = IdentifierRegex.IsMatch(value);
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100 | }
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101 | }
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102 | public static IEnumerable<Token> Tokenize(string s) {
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103 | int pos = 0;
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104 | foreach (Match m in TokenRegex.Matches(s)) {
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105 | yield return new Token(m.Value, pos);
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106 | pos += m.Length;
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107 | }
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108 | }
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109 | public override string ToString() {
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110 | if (Name != null)
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111 | return "Token(" + Name + ")";
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112 | if (Value != null)
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113 | return "\"" + Value + "\"";
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114 | if (Number != null)
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115 | return Number.ToString();
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116 | return "<empty>";
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117 | }
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118 | }
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119 |
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120 | private Queue<Token> tokens;
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121 | private int Position {
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122 | get {
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123 | if (tokens.Count == 0)
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124 | return -1;
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125 | else
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126 | return tokens.Peek().Position;
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127 | }
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128 | }
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129 |
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130 | private TypeNameParser(string s) {
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131 | tokens = new Queue<Token>(Token.Tokenize(s));
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132 | }
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133 |
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134 | /// <summary>
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135 | /// Parses the specified typename string as obtained by
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136 | /// <c>System.Object.GetType().FullName"</c>.
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137 | /// </summary>
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138 | /// <param name="s">The typename string.</param>
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139 | /// <returns>A <see cref="TypeName"/> representing the type name.</returns>
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140 | public static TypeName Parse(string s) {
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141 | TypeNameParser p = new TypeNameParser(s);
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142 | try {
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143 | return p.TransformTypeSpec();
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144 | } catch (ParseError x) {
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145 | if (p.Position > 0)
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146 | throw new ParseError(String.Format(
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147 | "Could not parse typename: {0}\n\"{1}====>{2}<===={3}",
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148 | x.Message,
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149 | s.Substring(0, p.Position),
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150 | s[p.Position],
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151 | s.Substring(p.Position, s.Length - p.Position)));
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152 | else
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153 | throw new ParseError(String.Format(
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154 | "Could not parse typenname \"{0}\" at end of input: {1}",
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155 | s,
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156 | x.Message));
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157 | }
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158 | }
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159 |
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160 | private TypeName TransformTypeSpec() {
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161 | TypeName t = TransformSimpleTypeSpec();
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162 | t.IsReference = ConsumeToken("AMPERSAND");
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163 | return t;
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164 | }
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165 |
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166 | private TypeName TransformSimpleTypeSpec() {
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167 | List<string> nameSpace = new List<string>();
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168 | nameSpace.Add(ConsumeIdentifier());
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169 | while (ConsumeToken("DOT"))
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170 | nameSpace.Add(ConsumeIdentifier());
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171 | List<string> className = new List<string>();
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172 | if (nameSpace.Count > 0) {
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173 | className.Add(nameSpace[nameSpace.Count - 1]);
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174 | nameSpace.RemoveAt(nameSpace.Count - 1);
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175 | }
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176 | while (ConsumeToken("PLUS"))
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177 | className.Add(ConsumeIdentifier());
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178 | TypeName typeName = new TypeName(
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179 | string.Join(".", nameSpace.ToArray()),
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180 | string.Join("+", className.ToArray()));
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181 | if (ConsumeToken("BACKTICK")) {
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182 | int nGenericArgs = ConsumeNumber();
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183 | if (ConsumeToken("OPEN_BRACKET") &&
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184 | CanConsumeToken("OPEN_BRACKET")) {
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185 | typeName.GenericArgs.AddRange(TransformGenerics());
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186 | ConsumeToken("CLOSE_BRACKET", true);
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187 | }
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188 | }
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189 | StringBuilder pointerOrArray = new StringBuilder();
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190 | while (true) {
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191 | if (ConsumeToken("ASTERSIK")) {
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192 | pointerOrArray.Append("*");
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193 | } else if (ConsumeToken("OPEN_BRACKET")) {
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194 | pointerOrArray.Append('[');
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195 | ParseDimension(pointerOrArray);
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196 | while (ConsumeToken("COMMA")) {
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197 | pointerOrArray.Append(",");
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198 | ParseDimension(pointerOrArray);
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199 | }
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200 | ConsumeToken("CLOSE_BRACKET", true);
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201 | pointerOrArray.Append(']');
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202 | } else {
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203 | break;
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204 | }
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205 | }
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206 | typeName.MemoryMagic = pointerOrArray.ToString();
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207 | if (ConsumeComma()) {
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208 | StringBuilder sb = new StringBuilder();
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209 | sb.Append(ConsumeIdentifier());
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210 | while (CanConsumeToken("DOT") ||
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211 | CanConsumeToken("DASH") ||
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212 | CanConsumeNumber() ||
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213 | CanConsumeIdentifier()) {
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214 | if (ConsumeToken("DOT"))
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215 | sb.Append('.');
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216 | else if (ConsumeToken("DASH"))
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217 | sb.Append('-');
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218 | else if (CanConsumeNumber())
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219 | sb.Append(ConsumeNumber());
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220 | else
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221 | sb.Append(ConsumeIdentifier());
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222 | }
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223 | typeName.AssemblyName = sb.ToString();
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224 | while (ConsumeComma()) {
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225 | KeyValuePair<string, string> property =
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226 | TransformAssemblyProperty();
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227 | typeName.AssemblyAttribues.Add(property.Key, property.Value);
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228 | }
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229 | }
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230 | return typeName;
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231 | }
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232 |
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233 | private void ParseDimension(StringBuilder sb) {
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234 | if (ConsumeToken("ASTERSIK")) {
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235 | sb.Append("*");
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236 | } else if (CanConsumeNumber()) {
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237 | sb.Append(ConsumeNumber());
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238 | ConsumeToken("DOT", true);
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239 | ConsumeToken("DOT", true);
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240 | if (ConsumeToken("DOT")) {
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241 | sb.Append("...");
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242 | } else {
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243 | sb.Append("..").Append(ConsumeNumber());
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244 | }
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245 | }
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246 | }
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247 |
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248 | private IEnumerable<TypeName> TransformGenerics() {
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249 | ConsumeToken("OPEN_BRACKET", true);
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250 | yield return TransformSimpleTypeSpec();
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251 | ConsumeToken("CLOSE_BRACKET", true);
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252 | while (ConsumeToken("COMMA")) {
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253 | ConsumeToken("OPEN_BRACKET", true);
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254 | yield return TransformSimpleTypeSpec();
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255 | ConsumeToken("CLOSE_BRACKET", true);
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256 | }
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257 | }
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258 |
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259 | private KeyValuePair<string, string> TransformAssemblyProperty() {
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260 | if (ConsumeIdentifier("Version")) {
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261 | ConsumeToken("EQUALS", true);
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262 | return new KeyValuePair<string, string>(
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263 | "Version",
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264 | TransformVersion());
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265 | } else if (ConsumeIdentifier("PublicKey")) {
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266 | return ConsumeAssignment("PublicKey");
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267 | } else if (ConsumeIdentifier("PublicKeyToken")) {
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268 | return ConsumeAssignment("PublicKeyToken");
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269 | } else if (ConsumeIdentifier("Culture")) {
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270 | return ConsumeAssignment("Culture");
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271 | } else if (ConsumeIdentifier("Custom")) {
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272 | return ConsumeAssignment("Custom");
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273 | } else {
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274 | throw new ParseError(String.Format(
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275 | "Invalid assembly property \"{0}\"",
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276 | tokens.Peek().ToString()));
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277 | }
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278 | }
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279 |
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280 | private KeyValuePair<string, string> ConsumeAssignment(string name) {
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281 | ConsumeToken("EQUALS", true);
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282 | return new KeyValuePair<string, string>(name, ConsumeToken());
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283 | }
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284 |
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285 | private string TransformVersion() {
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286 | StringBuilder version = new StringBuilder();
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287 | version.Append(ConsumeNumber());
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288 | ConsumeToken("DOT");
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289 | version.Append('.').Append(ConsumeNumber());
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290 | ConsumeToken("DOT");
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291 | version.Append('.').Append(ConsumeNumber());
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292 | ConsumeToken("DOT");
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293 | version.Append('.').Append(ConsumeNumber());
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294 | return version.ToString();
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295 | }
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296 |
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297 | private bool CanConsumeNumber() {
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298 | if (tokens.Count == 0)
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299 | return false;
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300 | return tokens.Peek().Number != null;
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301 | }
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302 |
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303 | private int ConsumeNumber() {
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304 | if (tokens.Count == 0)
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305 | throw new ParseError("End of input while expecting number");
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306 | if (tokens.Peek().Number != null)
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307 | return (int)tokens.Dequeue().Number;
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308 | throw new ParseError(string.Format(
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309 | "Number expected, found \"{0}\" instead",
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310 | tokens.Peek().ToString()));
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311 | }
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312 |
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313 | private bool ConsumeIdentifier(string value) {
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314 | if (tokens.Count == 0)
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315 | return false;
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316 | if (tokens.Peek().Value == value && tokens.Peek().IsIdentifier) {
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317 | tokens.Dequeue();
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318 | return true;
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319 | } else {
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320 | return false;
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321 | }
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322 | }
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323 |
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324 | private bool CanConsumeIdentifier() {
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325 | return tokens.Count > 0 && tokens.Peek().Value != null;
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326 | }
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327 |
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328 | private string ConsumeIdentifier() {
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329 | if (tokens.Count == 0)
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330 | throw new ParseError("End of input while expecting identifier");
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331 | if (tokens.Peek().Value != null && tokens.Peek().IsIdentifier)
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332 | return tokens.Dequeue().Value;
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333 | throw new ParseError(String.Format(
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334 | "Identifier expected, found \"{0}\" instead",
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335 | tokens.Peek().ToString()));
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336 | }
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337 |
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338 | private string ConsumeToken() {
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339 | if (tokens.Count == 0)
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340 | throw new ParseError("End of input while expecting token");
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341 | if (tokens.Peek().Value != null)
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342 | return tokens.Dequeue().Value;
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343 | throw new ParseError(String.Format(
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344 | "Token expected, found \"{0}\" instead",
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345 | tokens.Peek().ToString()));
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346 | }
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347 |
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348 | private bool ConsumeComma() {
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349 | if (ConsumeToken("COMMA")) {
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350 | while (ConsumeToken("SPACE")) ;
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351 | return true;
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352 | } else {
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353 | return false;
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354 | }
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355 | }
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356 |
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357 | private bool ConsumeToken(string name) {
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358 | return ConsumeToken(name, false);
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359 | }
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360 |
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361 | private bool CanConsumeToken(string name) {
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362 | if (tokens.Count == 0)
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363 | return false;
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364 | if (tokens.Peek().Name == name)
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365 | return true;
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366 | return false;
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367 | }
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368 |
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369 | private bool ConsumeToken(string name, bool force) {
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370 | if (tokens.Count == 0)
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371 | if (force)
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372 | throw new ParseError(String.Format(
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373 | "end of input while expecting token \"{0}\"",
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374 | name));
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375 | else
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376 | return false;
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377 | if (tokens.Peek().Name == name) {
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378 | tokens.Dequeue();
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379 | return true;
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380 | } else if (force) {
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381 | throw new ParseError(String.Format(
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382 | "expected \"{0}\" found \"{1}\"",
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383 | name,
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384 | tokens.Peek().ToString()));
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385 | } else {
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386 | return false;
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387 | }
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388 | }
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389 | }
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390 | } |
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