1 | using System; |
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2 | using Stream = System.IO.Stream; |
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3 | using TextReader = System.IO.TextReader; |
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4 | using StringBuilder = System.Text.StringBuilder; |
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5 | using Hashtable = System.Collections.Hashtable; |
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6 | using Assembly = System.Reflection.Assembly; |
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7 | using EventHandlerList = System.ComponentModel.EventHandlerList; |
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8 | |
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9 | using BitSet = antlr.collections.impl.BitSet; |
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10 | using antlr.debug; |
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11 | |
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12 | namespace antlr |
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13 | { |
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14 | /*ANTLR Translator Generator |
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15 | * Project led by Terence Parr at http://www.jGuru.com |
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16 | * Software rights: http://www.antlr.org/license.html |
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17 | * |
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18 | * $Id:$ |
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19 | */ |
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20 | |
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21 | // |
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22 | // ANTLR C# Code Generator by Micheal Jordan |
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23 | // Kunle Odutola : kunle UNDERSCORE odutola AT hotmail DOT com |
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24 | // Anthony Oguntimehin |
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25 | // |
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26 | // With many thanks to Eric V. Smith from the ANTLR list. |
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27 | // |
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28 | |
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29 | public abstract class CharScanner : TokenStream, ICharScannerDebugSubject |
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30 | { |
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31 | internal const char NO_CHAR = (char) (0); |
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32 | public static readonly char EOF_CHAR = Char.MaxValue; |
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33 | |
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34 | // Used to store event delegates |
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35 | private EventHandlerList events_ = new EventHandlerList(); |
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36 | |
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37 | protected internal EventHandlerList Events |
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38 | { |
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39 | get { return events_; } |
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40 | } |
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41 | |
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42 | // The unique keys for each event that CharScanner [objects] can generate |
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43 | internal static readonly object EnterRuleEventKey = new object(); |
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44 | internal static readonly object ExitRuleEventKey = new object(); |
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45 | internal static readonly object DoneEventKey = new object(); |
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46 | internal static readonly object ReportErrorEventKey = new object(); |
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47 | internal static readonly object ReportWarningEventKey = new object(); |
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48 | internal static readonly object NewLineEventKey = new object(); |
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49 | internal static readonly object MatchEventKey = new object(); |
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50 | internal static readonly object MatchNotEventKey = new object(); |
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51 | internal static readonly object MisMatchEventKey = new object(); |
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52 | internal static readonly object MisMatchNotEventKey = new object(); |
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53 | internal static readonly object ConsumeEventKey = new object(); |
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54 | internal static readonly object LAEventKey = new object(); |
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55 | internal static readonly object SemPredEvaluatedEventKey = new object(); |
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56 | internal static readonly object SynPredStartedEventKey = new object(); |
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57 | internal static readonly object SynPredFailedEventKey = new object(); |
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58 | internal static readonly object SynPredSucceededEventKey = new object(); |
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59 | |
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60 | protected internal StringBuilder text; // text of current token |
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61 | |
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62 | protected bool saveConsumedInput = true; // does consume() save characters? |
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63 | |
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64 | /// <summary>Used for creating Token instances.</summary> |
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65 | protected TokenCreator tokenCreator; |
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66 | |
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67 | /// <summary>Used for caching lookahead characters.</summary> |
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68 | protected char cached_LA1; |
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69 | protected char cached_LA2; |
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70 | |
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71 | protected bool caseSensitive = true; |
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72 | protected bool caseSensitiveLiterals = true; |
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73 | protected Hashtable literals; // set by subclass |
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74 | |
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75 | /*Tab chars are handled by tab() according to this value; override |
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76 | * method to do anything weird with tabs. |
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77 | */ |
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78 | protected internal int tabsize = 8; |
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79 | |
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80 | protected internal IToken returnToken_ = null; // used to return tokens w/o using return val. |
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81 | |
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82 | protected internal LexerSharedInputState inputState; |
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83 | |
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84 | /*Used during filter mode to indicate that path is desired. |
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85 | * A subsequent scan error will report an error as usual if |
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86 | * acceptPath=true; |
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87 | */ |
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88 | protected internal bool commitToPath = false; |
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89 | |
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90 | /*Used to keep track of indentdepth for traceIn/Out */ |
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91 | protected internal int traceDepth = 0; |
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92 | |
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93 | public CharScanner() |
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94 | { |
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95 | text = new StringBuilder(); |
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96 | setTokenCreator(new CommonToken.CommonTokenCreator()); |
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97 | } |
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98 | |
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99 | public CharScanner(InputBuffer cb) : this() |
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100 | { |
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101 | inputState = new LexerSharedInputState(cb); |
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102 | cached_LA2 = inputState.input.LA(2); |
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103 | cached_LA1 = inputState.input.LA(1); |
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104 | } |
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105 | |
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106 | public CharScanner(LexerSharedInputState sharedState) : this() |
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107 | { |
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108 | inputState = sharedState; |
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109 | if (inputState != null) |
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110 | { |
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111 | cached_LA2 = inputState.input.LA(2); |
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112 | cached_LA1 = inputState.input.LA(1); |
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113 | } |
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114 | } |
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115 | |
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116 | |
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117 | public event TraceEventHandler EnterRule |
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118 | { |
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119 | add { Events.AddHandler(EnterRuleEventKey, value); } |
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120 | remove { Events.RemoveHandler(EnterRuleEventKey, value); } |
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121 | } |
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122 | |
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123 | public event TraceEventHandler ExitRule |
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124 | { |
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125 | add { Events.AddHandler(ExitRuleEventKey, value); } |
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126 | remove { Events.RemoveHandler(ExitRuleEventKey, value); } |
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127 | } |
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128 | |
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129 | public event TraceEventHandler Done |
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130 | { |
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131 | add { Events.AddHandler(DoneEventKey, value); } |
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132 | remove { Events.RemoveHandler(DoneEventKey, value); } |
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133 | } |
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134 | |
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135 | public event MessageEventHandler ErrorReported |
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136 | { |
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137 | add { Events.AddHandler(ReportErrorEventKey, value); } |
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138 | remove { Events.RemoveHandler(ReportErrorEventKey, value); } |
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139 | } |
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140 | |
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141 | public event MessageEventHandler WarningReported |
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142 | { |
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143 | add { Events.AddHandler(ReportWarningEventKey, value); } |
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144 | remove { Events.RemoveHandler(ReportWarningEventKey, value); } |
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145 | } |
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146 | |
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147 | public event NewLineEventHandler HitNewLine |
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148 | { |
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149 | add { Events.AddHandler(NewLineEventKey, value); } |
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150 | remove { Events.RemoveHandler(NewLineEventKey, value); } |
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151 | } |
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152 | |
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153 | public event MatchEventHandler MatchedChar |
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154 | { |
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155 | add { Events.AddHandler(MatchEventKey, value); } |
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156 | remove { Events.RemoveHandler(MatchEventKey, value); } |
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157 | } |
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158 | |
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159 | public event MatchEventHandler MatchedNotChar |
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160 | { |
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161 | add { Events.AddHandler(MatchNotEventKey, value); } |
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162 | remove { Events.RemoveHandler(MatchNotEventKey, value); } |
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163 | } |
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164 | |
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165 | public event MatchEventHandler MisMatchedChar |
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166 | { |
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167 | add { Events.AddHandler(MisMatchEventKey, value); } |
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168 | remove { Events.RemoveHandler(MisMatchEventKey, value); } |
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169 | } |
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170 | |
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171 | public event MatchEventHandler MisMatchedNotChar |
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172 | { |
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173 | add { Events.AddHandler(MisMatchNotEventKey, value); } |
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174 | remove { Events.RemoveHandler(MisMatchNotEventKey, value); } |
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175 | } |
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176 | |
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177 | public event TokenEventHandler ConsumedChar |
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178 | { |
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179 | add { Events.AddHandler(ConsumeEventKey, value); } |
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180 | remove { Events.RemoveHandler(ConsumeEventKey, value); } |
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181 | } |
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182 | |
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183 | public event TokenEventHandler CharLA |
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184 | { |
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185 | add { Events.AddHandler(LAEventKey, value); } |
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186 | remove { Events.RemoveHandler(LAEventKey, value); } |
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187 | } |
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188 | |
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189 | public event SemanticPredicateEventHandler SemPredEvaluated |
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190 | { |
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191 | add { Events.AddHandler(SemPredEvaluatedEventKey, value); } |
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192 | remove { Events.RemoveHandler(SemPredEvaluatedEventKey, value); } |
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193 | } |
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194 | |
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195 | public event SyntacticPredicateEventHandler SynPredStarted |
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196 | { |
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197 | add { Events.AddHandler(SynPredStartedEventKey, value); } |
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198 | remove { Events.RemoveHandler(SynPredStartedEventKey, value); } |
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199 | } |
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200 | |
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201 | public event SyntacticPredicateEventHandler SynPredFailed |
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202 | { |
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203 | add { Events.AddHandler(SynPredFailedEventKey, value); } |
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204 | remove { Events.RemoveHandler(SynPredFailedEventKey, value); } |
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205 | } |
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206 | |
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207 | public event SyntacticPredicateEventHandler SynPredSucceeded |
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208 | { |
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209 | add { Events.AddHandler(SynPredSucceededEventKey, value); } |
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210 | remove { Events.RemoveHandler(SynPredSucceededEventKey, value); } |
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211 | } |
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212 | |
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213 | // From interface TokenStream |
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214 | public virtual IToken nextToken() { return null; } |
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215 | |
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216 | public virtual void append(char c) |
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217 | { |
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218 | if (saveConsumedInput) |
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219 | { |
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220 | text.Append(c); |
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221 | } |
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222 | } |
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223 | |
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224 | public virtual void append(string s) |
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225 | { |
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226 | if (saveConsumedInput) |
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227 | { |
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228 | text.Append(s); |
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229 | } |
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230 | } |
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231 | |
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232 | public virtual void commit() |
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233 | { |
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234 | inputState.input.commit(); |
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235 | } |
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236 | |
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237 | public virtual void recover(RecognitionException ex, BitSet tokenSet) |
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238 | { |
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239 | consume(); |
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240 | consumeUntil(tokenSet); |
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241 | } |
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242 | |
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243 | public virtual void consume() |
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244 | { |
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245 | if (inputState.guessing == 0) |
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246 | { |
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247 | if (caseSensitive) |
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248 | { |
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249 | append(cached_LA1); |
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250 | } |
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251 | else |
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252 | { |
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253 | // use input.LA(), not LA(), to get original case |
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254 | // CharScanner.LA() would toLower it. |
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255 | append(inputState.input.LA(1)); |
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256 | } |
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257 | if (cached_LA1 == '\t') |
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258 | { |
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259 | tab(); |
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260 | } |
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261 | else |
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262 | { |
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263 | inputState.column++; |
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264 | } |
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265 | } |
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266 | if (caseSensitive) |
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267 | { |
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268 | cached_LA1 = inputState.input.consume(); |
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269 | cached_LA2 = inputState.input.LA(2); |
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270 | } |
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271 | else |
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272 | { |
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273 | cached_LA1 = toLower(inputState.input.consume()); |
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274 | cached_LA2 = toLower(inputState.input.LA(2)); |
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275 | } |
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276 | } |
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277 | |
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278 | /*Consume chars until one matches the given char */ |
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279 | public virtual void consumeUntil(int c) |
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280 | { |
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281 | while ((EOF_CHAR != cached_LA1) && (c != cached_LA1)) |
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282 | { |
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283 | consume(); |
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284 | } |
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285 | } |
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286 | |
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287 | /*Consume chars until one matches the given set */ |
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288 | public virtual void consumeUntil(BitSet bset) |
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289 | { |
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290 | while (cached_LA1 != EOF_CHAR && !bset.member(cached_LA1)) |
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291 | { |
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292 | consume(); |
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293 | } |
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294 | } |
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295 | |
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296 | public virtual bool getCaseSensitive() |
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297 | { |
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298 | return caseSensitive; |
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299 | } |
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300 | |
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301 | public bool getCaseSensitiveLiterals() |
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302 | { |
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303 | return caseSensitiveLiterals; |
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304 | } |
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305 | |
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306 | public virtual int getColumn() |
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307 | { |
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308 | return inputState.column; |
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309 | } |
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310 | |
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311 | public virtual void setColumn(int c) |
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312 | { |
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313 | inputState.column = c; |
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314 | } |
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315 | |
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316 | public virtual bool getCommitToPath() |
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317 | { |
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318 | return commitToPath; |
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319 | } |
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320 | |
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321 | public virtual string getFilename() |
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322 | { |
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323 | return inputState.filename; |
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324 | } |
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325 | |
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326 | public virtual InputBuffer getInputBuffer() |
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327 | { |
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328 | return inputState.input; |
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329 | } |
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330 | |
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331 | public virtual LexerSharedInputState getInputState() |
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332 | { |
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333 | return inputState; |
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334 | } |
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335 | |
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336 | public virtual void setInputState(LexerSharedInputState state) |
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337 | { |
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338 | inputState = state; |
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339 | } |
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340 | |
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341 | public virtual int getLine() |
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342 | { |
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343 | return inputState.line; |
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344 | } |
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345 | |
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346 | /*return a copy of the current text buffer */ |
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347 | public virtual string getText() |
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348 | { |
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349 | return text.ToString(); |
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350 | } |
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351 | |
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352 | public virtual IToken getTokenObject() |
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353 | { |
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354 | return returnToken_; |
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355 | } |
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356 | |
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357 | public virtual char LA(int i) |
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358 | { |
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359 | if (i == 1) |
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360 | { |
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361 | return cached_LA1; |
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362 | } |
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363 | if (i == 2) |
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364 | { |
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365 | return cached_LA2; |
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366 | } |
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367 | if (caseSensitive) |
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368 | { |
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369 | return inputState.input.LA(i); |
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370 | } |
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371 | else |
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372 | { |
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373 | return toLower(inputState.input.LA(i)); |
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374 | } |
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375 | } |
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376 | |
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377 | protected internal virtual IToken makeToken(int t) |
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378 | { |
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379 | IToken newToken = null; |
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380 | bool typeCreated; |
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381 | |
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382 | try |
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383 | { |
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384 | newToken = tokenCreator.Create(); |
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385 | if (newToken != null) |
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386 | { |
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387 | newToken.Type = t; |
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388 | newToken.setColumn(inputState.tokenStartColumn); |
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389 | newToken.setLine(inputState.tokenStartLine); |
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390 | // tracking real start line now: newToken.setLine(inputState.line); |
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391 | newToken.setFilename(inputState.filename); |
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392 | } |
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393 | typeCreated = true; |
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394 | } |
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395 | catch |
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396 | { |
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397 | typeCreated = false; |
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398 | } |
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399 | |
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400 | if (!typeCreated) |
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401 | { |
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402 | panic("Can't create Token object '" + tokenCreator.TokenTypeName + "'"); |
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403 | newToken = Token.badToken; |
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404 | } |
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405 | return newToken; |
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406 | } |
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407 | |
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408 | public virtual int mark() |
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409 | { |
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410 | return inputState.input.mark(); |
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411 | } |
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412 | |
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413 | public virtual void match(char c) |
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414 | { |
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415 | match((int) c); |
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416 | } |
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417 | |
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418 | public virtual void match(int c) |
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419 | { |
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420 | if (cached_LA1 != c) |
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421 | { |
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422 | throw new MismatchedCharException(cached_LA1, Convert.ToChar(c), false, this); |
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423 | } |
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424 | consume(); |
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425 | } |
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426 | |
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427 | public virtual void match(BitSet b) |
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428 | { |
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429 | if (!b.member(cached_LA1)) |
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430 | { |
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431 | throw new MismatchedCharException(cached_LA1, b, false, this); |
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432 | } |
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433 | consume(); |
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434 | } |
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435 | |
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436 | public virtual void match(string s) |
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437 | { |
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438 | int len = s.Length; |
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439 | for (int i = 0; i < len; i++) |
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440 | { |
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441 | if (cached_LA1 != s[i]) |
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442 | { |
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443 | throw new MismatchedCharException(cached_LA1, s[i], false, this); |
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444 | } |
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445 | consume(); |
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446 | } |
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447 | } |
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448 | |
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449 | public virtual void matchNot(char c) |
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450 | { |
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451 | matchNot((int) c); |
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452 | } |
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453 | |
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454 | public virtual void matchNot(int c) |
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455 | { |
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456 | if (cached_LA1 == c) |
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457 | { |
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458 | throw new MismatchedCharException(cached_LA1, Convert.ToChar(c), true, this); |
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459 | } |
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460 | consume(); |
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461 | } |
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462 | |
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463 | public virtual void matchRange(int c1, int c2) |
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464 | { |
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465 | if (cached_LA1 < c1 || cached_LA1 > c2) |
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466 | { |
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467 | throw new MismatchedCharException(cached_LA1, Convert.ToChar(c1), Convert.ToChar(c2), false, this); |
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468 | } |
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469 | consume(); |
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470 | } |
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471 | |
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472 | public virtual void matchRange(char c1, char c2) |
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473 | { |
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474 | matchRange((int) c1, (int) c2); |
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475 | } |
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476 | |
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477 | public virtual void newline() |
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478 | { |
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479 | inputState.line++; |
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480 | inputState.column = 1; |
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481 | } |
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482 | |
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483 | /*advance the current column number by an appropriate amount |
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484 | * according to tab size. This method is called from consume(). |
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485 | */ |
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486 | public virtual void tab() |
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487 | { |
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488 | int c = getColumn(); |
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489 | int nc = (((c - 1) / tabsize) + 1) * tabsize + 1; // calculate tab stop |
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490 | setColumn(nc); |
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491 | } |
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492 | |
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493 | public virtual void setTabSize(int size) |
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494 | { |
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495 | tabsize = size; |
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496 | } |
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497 | |
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498 | public virtual int getTabSize() |
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499 | { |
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500 | return tabsize; |
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501 | } |
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502 | |
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503 | public virtual void panic() |
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504 | { |
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505 | //Console.Error.WriteLine("CharScanner: panic"); |
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506 | //Environment.Exit(1); |
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507 | panic(""); |
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508 | |
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509 | } |
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510 | |
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511 | /// <summary> |
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512 | /// This method is executed by ANTLR internally when it detected an illegal |
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513 | /// state that cannot be recovered from. |
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514 | /// The previous implementation of this method called <see cref="Environment.Exit"/> |
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515 | /// and writes directly to <see cref="Console.Error"/>, which is usually not |
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516 | /// appropriate when a translator is embedded into a larger application. |
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517 | /// </summary> |
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518 | /// <param name="s">Error message.</param> |
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519 | public virtual void panic(string s) |
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520 | { |
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521 | //Console.Error.WriteLine("CharScanner; panic: " + s); |
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522 | //Environment.Exit(1); |
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523 | throw new ANTLRPanicException("CharScanner::panic: " + s); |
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524 | } |
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525 | |
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526 | /*Parser error-reporting function can be overridden in subclass */ |
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527 | public virtual void reportError(RecognitionException ex) |
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528 | { |
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529 | Console.Error.WriteLine(ex); |
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530 | } |
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531 | |
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532 | /*Parser error-reporting function can be overridden in subclass */ |
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533 | public virtual void reportError(string s) |
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534 | { |
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535 | if (getFilename() == null) |
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536 | { |
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537 | Console.Error.WriteLine("error: " + s); |
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538 | } |
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539 | else |
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540 | { |
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541 | Console.Error.WriteLine(getFilename() + ": error: " + s); |
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542 | } |
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543 | } |
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544 | |
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545 | /*Parser warning-reporting function can be overridden in subclass */ |
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546 | public virtual void reportWarning(string s) |
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547 | { |
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548 | if (getFilename() == null) |
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549 | { |
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550 | Console.Error.WriteLine("warning: " + s); |
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551 | } |
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552 | else |
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553 | { |
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554 | Console.Error.WriteLine(getFilename() + ": warning: " + s); |
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555 | } |
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556 | } |
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557 | |
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558 | public virtual void refresh() |
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559 | { |
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560 | if (caseSensitive) |
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561 | { |
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562 | cached_LA2 = inputState.input.LA(2); |
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563 | cached_LA1 = inputState.input.LA(1); |
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564 | } |
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565 | else |
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566 | { |
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567 | cached_LA2 = toLower(inputState.input.LA(2)); |
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568 | cached_LA1 = toLower(inputState.input.LA(1)); |
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569 | } |
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570 | } |
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571 | |
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572 | public virtual void resetState(InputBuffer ib) |
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573 | { |
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574 | text.Length = 0; |
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575 | traceDepth = 0; |
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576 | inputState.resetInput(ib); |
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577 | refresh(); |
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578 | } |
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579 | |
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580 | public void resetState(Stream s) |
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581 | { |
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582 | resetState(new ByteBuffer(s)); |
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583 | } |
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584 | |
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585 | public void resetState(TextReader tr) |
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586 | { |
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587 | resetState(new CharBuffer(tr)); |
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588 | } |
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589 | |
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590 | public virtual void resetText() |
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591 | { |
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592 | text.Length = 0; |
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593 | inputState.tokenStartColumn = inputState.column; |
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594 | inputState.tokenStartLine = inputState.line; |
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595 | } |
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596 | |
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597 | public virtual void rewind(int pos) |
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598 | { |
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599 | inputState.input.rewind(pos); |
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600 | //setColumn(inputState.tokenStartColumn); |
---|
601 | if (caseSensitive) |
---|
602 | { |
---|
603 | cached_LA2 = inputState.input.LA(2); |
---|
604 | cached_LA1 = inputState.input.LA(1); |
---|
605 | } |
---|
606 | else |
---|
607 | { |
---|
608 | cached_LA2 = toLower(inputState.input.LA(2)); |
---|
609 | cached_LA1 = toLower(inputState.input.LA(1)); |
---|
610 | } |
---|
611 | } |
---|
612 | |
---|
613 | public virtual void setCaseSensitive(bool t) |
---|
614 | { |
---|
615 | caseSensitive = t; |
---|
616 | if (caseSensitive) |
---|
617 | { |
---|
618 | cached_LA2 = inputState.input.LA(2); |
---|
619 | cached_LA1 = inputState.input.LA(1); |
---|
620 | } |
---|
621 | else |
---|
622 | { |
---|
623 | cached_LA2 = toLower(inputState.input.LA(2)); |
---|
624 | cached_LA1 = toLower(inputState.input.LA(1)); |
---|
625 | } |
---|
626 | } |
---|
627 | |
---|
628 | public virtual void setCommitToPath(bool commit) |
---|
629 | { |
---|
630 | commitToPath = commit; |
---|
631 | } |
---|
632 | |
---|
633 | public virtual void setFilename(string f) |
---|
634 | { |
---|
635 | inputState.filename = f; |
---|
636 | } |
---|
637 | |
---|
638 | public virtual void setLine(int line) |
---|
639 | { |
---|
640 | inputState.line = line; |
---|
641 | } |
---|
642 | |
---|
643 | public virtual void setText(string s) |
---|
644 | { |
---|
645 | resetText(); |
---|
646 | text.Append(s); |
---|
647 | } |
---|
648 | |
---|
649 | public virtual void setTokenObjectClass(string cl) |
---|
650 | { |
---|
651 | this.tokenCreator = new ReflectionBasedTokenCreator(this, cl); |
---|
652 | } |
---|
653 | |
---|
654 | public virtual void setTokenCreator(TokenCreator tokenCreator) |
---|
655 | { |
---|
656 | this.tokenCreator = tokenCreator; |
---|
657 | } |
---|
658 | |
---|
659 | // Test the token text against the literals table |
---|
660 | // Override this method to perform a different literals test |
---|
661 | public virtual int testLiteralsTable(int ttype) |
---|
662 | { |
---|
663 | string tokenText = text.ToString(); |
---|
664 | |
---|
665 | if ( (tokenText == null) || (tokenText == string.Empty) ) |
---|
666 | return ttype; |
---|
667 | else |
---|
668 | { |
---|
669 | object typeAsObject = literals[tokenText]; |
---|
670 | return (typeAsObject == null) ? ttype : ((int) typeAsObject); |
---|
671 | } |
---|
672 | } |
---|
673 | |
---|
674 | /*Test the text passed in against the literals table |
---|
675 | * Override this method to perform a different literals test |
---|
676 | * This is used primarily when you want to test a portion of |
---|
677 | * a token. |
---|
678 | */ |
---|
679 | public virtual int testLiteralsTable(string someText, int ttype) |
---|
680 | { |
---|
681 | if ( (someText == null) || (someText == string.Empty) ) |
---|
682 | return ttype; |
---|
683 | else |
---|
684 | { |
---|
685 | object typeAsObject = literals[someText]; |
---|
686 | return (typeAsObject == null) ? ttype : ((int) typeAsObject); |
---|
687 | } |
---|
688 | } |
---|
689 | |
---|
690 | // Override this method to get more specific case handling |
---|
691 | public virtual char toLower(int c) |
---|
692 | { |
---|
693 | return Char.ToLower(Convert.ToChar(c), System.Globalization.CultureInfo.InvariantCulture); |
---|
694 | } |
---|
695 | |
---|
696 | public virtual void traceIndent() |
---|
697 | { |
---|
698 | for (int i = 0; i < traceDepth; i++) |
---|
699 | Console.Out.Write(" "); |
---|
700 | } |
---|
701 | |
---|
702 | public virtual void traceIn(string rname) |
---|
703 | { |
---|
704 | traceDepth += 1; |
---|
705 | traceIndent(); |
---|
706 | Console.Out.WriteLine("> lexer " + rname + "; c==" + LA(1)); |
---|
707 | } |
---|
708 | |
---|
709 | public virtual void traceOut(string rname) |
---|
710 | { |
---|
711 | traceIndent(); |
---|
712 | Console.Out.WriteLine("< lexer " + rname + "; c==" + LA(1)); |
---|
713 | traceDepth -= 1; |
---|
714 | } |
---|
715 | |
---|
716 | /*This method is called by YourLexer.nextToken() when the lexer has |
---|
717 | * hit EOF condition. EOF is NOT a character. |
---|
718 | * This method is not called if EOF is reached during |
---|
719 | * syntactic predicate evaluation or during evaluation |
---|
720 | * of normal lexical rules, which presumably would be |
---|
721 | * an IOException. This traps the "normal" EOF condition. |
---|
722 | * |
---|
723 | * uponEOF() is called after the complete evaluation of |
---|
724 | * the previous token and only if your parser asks |
---|
725 | * for another token beyond that last non-EOF token. |
---|
726 | * |
---|
727 | * You might want to throw token or char stream exceptions |
---|
728 | * like: "Heh, premature eof" or a retry stream exception |
---|
729 | * ("I found the end of this file, go back to referencing file"). |
---|
730 | */ |
---|
731 | public virtual void uponEOF() |
---|
732 | { |
---|
733 | } |
---|
734 | |
---|
735 | private class ReflectionBasedTokenCreator : TokenCreator |
---|
736 | { |
---|
737 | protected ReflectionBasedTokenCreator() {} |
---|
738 | |
---|
739 | public ReflectionBasedTokenCreator(CharScanner owner, string tokenTypeName) |
---|
740 | { |
---|
741 | this.owner = owner; |
---|
742 | SetTokenType(tokenTypeName); |
---|
743 | } |
---|
744 | |
---|
745 | private CharScanner owner; |
---|
746 | |
---|
747 | /// <summary> |
---|
748 | /// The fully qualified name of the Token type to create. |
---|
749 | /// </summary> |
---|
750 | private string tokenTypeName; |
---|
751 | |
---|
752 | /// <summary> |
---|
753 | /// Type object used as a template for creating tokens by reflection. |
---|
754 | /// </summary> |
---|
755 | private Type tokenTypeObject; |
---|
756 | |
---|
757 | /// <summary> |
---|
758 | /// Returns the fully qualified name of the Token type that this |
---|
759 | /// class creates. |
---|
760 | /// </summary> |
---|
761 | private void SetTokenType(string tokenTypeName) |
---|
762 | { |
---|
763 | this.tokenTypeName = tokenTypeName; |
---|
764 | foreach (Assembly assem in AppDomain.CurrentDomain.GetAssemblies()) |
---|
765 | { |
---|
766 | try |
---|
767 | { |
---|
768 | tokenTypeObject = assem.GetType(tokenTypeName); |
---|
769 | if (tokenTypeObject != null) |
---|
770 | { |
---|
771 | break; |
---|
772 | } |
---|
773 | } |
---|
774 | catch |
---|
775 | { |
---|
776 | throw new TypeLoadException("Unable to load Type for Token class '" + tokenTypeName + "'"); |
---|
777 | } |
---|
778 | } |
---|
779 | if (tokenTypeObject==null) |
---|
780 | throw new TypeLoadException("Unable to load Type for Token class '" + tokenTypeName + "'"); |
---|
781 | } |
---|
782 | |
---|
783 | /// <summary> |
---|
784 | /// Returns the fully qualified name of the Token type that this |
---|
785 | /// class creates. |
---|
786 | /// </summary> |
---|
787 | public override string TokenTypeName |
---|
788 | { |
---|
789 | get |
---|
790 | { |
---|
791 | return tokenTypeName; |
---|
792 | } |
---|
793 | } |
---|
794 | |
---|
795 | /// <summary> |
---|
796 | /// Constructs a <see cref="Token"/> instance. |
---|
797 | /// </summary> |
---|
798 | public override IToken Create() |
---|
799 | { |
---|
800 | IToken newToken = null; |
---|
801 | |
---|
802 | try |
---|
803 | { |
---|
804 | newToken = (Token) Activator.CreateInstance(tokenTypeObject); |
---|
805 | } |
---|
806 | catch |
---|
807 | { |
---|
808 | // supress exception |
---|
809 | } |
---|
810 | return newToken; |
---|
811 | } |
---|
812 | } |
---|
813 | } |
---|
814 | } |
---|