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162
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1 using Implab;
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2 using System;
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3 using System.Linq;
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4
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5 namespace Implab.Automaton.RegularExpressions {
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177
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6 public abstract class Token {
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7 public abstract void Accept(IVisitor visitor);
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162
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8
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178
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9 public Token End() {
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177
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10 return Cat(new EndToken());
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162
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11 }
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12
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177
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13 public Token Tag<TTag>(TTag tag) {
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162
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14 return Cat(new EndToken<TTag>(tag));
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15 }
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16
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177
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17 public Token Cat(Token right) {
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18 return new CatToken(this, right);
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162
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19 }
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20
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177
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21 public Token Or(Token right) {
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22 return new AltToken(this, right);
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162
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23 }
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24
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177
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25 public Token Optional() {
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26 return Or(new EmptyToken());
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162
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27 }
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28
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177
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29 public Token EClosure() {
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30 return new StarToken(this);
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162
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31 }
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32
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177
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33 public Token Closure() {
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34 return Cat(new StarToken(this));
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162
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35 }
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36
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177
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37 public Token Repeat(int count) {
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38 Token token = null;
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162
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39
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40 for (int i = 0; i < count; i++)
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41 token = token != null ? token.Cat(this) : this;
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177
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42 return token ?? new EmptyToken();
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162
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43 }
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44
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177
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45 public Token Repeat(int min, int max) {
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162
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46 if (min > max || min < 1)
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47 throw new ArgumentOutOfRangeException();
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48 var token = Repeat(min);
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49
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50 for (int i = min; i < max; i++)
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165
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51 token = token.Cat( Optional() );
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162
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52 return token;
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53 }
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54
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177
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55 public static Token New(params int[] set) {
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162
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56 Safe.ArgumentNotNull(set, "set");
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177
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57 Token token = null;
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162
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58 foreach(var c in set.Distinct())
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177
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59 token = token == null ? new SymbolToken(c) : token.Or(new SymbolToken(c));
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162
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60 return token;
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61 }
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62 }
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63 }
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