Mercurial > pub > ImplabNet
view Implab/Automaton/RegularExpressions/Token.cs @ 260:547a2fc0d93e v3 v3.0.6
minor fixes
author | cin |
---|---|
date | Fri, 13 Apr 2018 19:14:59 +0300 |
parents | d5c5db0335ee |
children |
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using Implab; using System; using System.Linq; namespace Implab.Automaton.RegularExpressions { public abstract class Token { public abstract void Accept(IVisitor visitor); public Token End() { return Cat(new EndToken()); } public Token Tag<TTag>(TTag tag) { return Cat(new EndToken<TTag>(tag)); } public Token Cat(Token right) { return new CatToken(this, right); } public Token Or(Token right) { return new AltToken(this, right); } public Token Optional() { return Or(new EmptyToken()); } public Token EClosure() { return new StarToken(this); } public Token Closure() { return Cat(new StarToken(this)); } public Token Repeat(int count) { Token token = null; for (int i = 0; i < count; i++) token = token != null ? token.Cat(this) : this; return token ?? new EmptyToken(); } public Token Repeat(int min, int max) { if (min > max || min < 1) throw new ArgumentOutOfRangeException(); var token = Repeat(min); for (int i = min; i < max; i++) token = token.Cat( Optional() ); return token; } public static Token New(params int[] set) { Safe.ArgumentNotNull(set, "set"); Token token = null; foreach(var c in set.Distinct()) token = token == null ? new SymbolToken(c) : token.Or(new SymbolToken(c)); return token; } } }