Mercurial > pub > ImplabNet
comparison Implab/Automaton/RegularExpressions/Token.cs @ 190:1c2a16d071a7 v2
Слияние с ref20160224
author | cin |
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date | Fri, 22 Apr 2016 13:08:08 +0300 |
parents | d5c5db0335ee |
children |
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161:2a8466f0cb8a | 190:1c2a16d071a7 |
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1 using Implab; | |
2 using System; | |
3 using System.Linq; | |
4 | |
5 namespace Implab.Automaton.RegularExpressions { | |
6 public abstract class Token { | |
7 public abstract void Accept(IVisitor visitor); | |
8 | |
9 public Token End() { | |
10 return Cat(new EndToken()); | |
11 } | |
12 | |
13 public Token Tag<TTag>(TTag tag) { | |
14 return Cat(new EndToken<TTag>(tag)); | |
15 } | |
16 | |
17 public Token Cat(Token right) { | |
18 return new CatToken(this, right); | |
19 } | |
20 | |
21 public Token Or(Token right) { | |
22 return new AltToken(this, right); | |
23 } | |
24 | |
25 public Token Optional() { | |
26 return Or(new EmptyToken()); | |
27 } | |
28 | |
29 public Token EClosure() { | |
30 return new StarToken(this); | |
31 } | |
32 | |
33 public Token Closure() { | |
34 return Cat(new StarToken(this)); | |
35 } | |
36 | |
37 public Token Repeat(int count) { | |
38 Token token = null; | |
39 | |
40 for (int i = 0; i < count; i++) | |
41 token = token != null ? token.Cat(this) : this; | |
42 return token ?? new EmptyToken(); | |
43 } | |
44 | |
45 public Token Repeat(int min, int max) { | |
46 if (min > max || min < 1) | |
47 throw new ArgumentOutOfRangeException(); | |
48 var token = Repeat(min); | |
49 | |
50 for (int i = min; i < max; i++) | |
51 token = token.Cat( Optional() ); | |
52 return token; | |
53 } | |
54 | |
55 public static Token New(params int[] set) { | |
56 Safe.ArgumentNotNull(set, "set"); | |
57 Token token = null; | |
58 foreach(var c in set.Distinct()) | |
59 token = token == null ? new SymbolToken(c) : token.Or(new SymbolToken(c)); | |
60 return token; | |
61 } | |
62 } | |
63 } |