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using Implab;
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using System;
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using System.Linq;
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namespace Implab.Automaton.RegularExpressions {
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public abstract class Token {
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public abstract void Accept(IVisitor visitor);
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public Token Extend() {
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return Cat(new EndToken());
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}
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public Token Tag<TTag>(TTag tag) {
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return Cat(new EndToken<TTag>(tag));
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}
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public Token Cat(Token right) {
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return new CatToken(this, right);
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}
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public Token Or(Token right) {
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return new AltToken(this, right);
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}
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public Token Optional() {
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return Or(new EmptyToken());
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}
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public Token EClosure() {
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return new StarToken(this);
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}
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public Token Closure() {
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return Cat(new StarToken(this));
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}
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public Token Repeat(int count) {
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Token token = null;
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for (int i = 0; i < count; i++)
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token = token != null ? token.Cat(this) : this;
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return token ?? new EmptyToken();
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}
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public Token Repeat(int min, int max) {
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if (min > max || min < 1)
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throw new ArgumentOutOfRangeException();
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var token = Repeat(min);
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for (int i = min; i < max; i++)
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token = token.Cat( Optional() );
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return token;
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}
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public static Token New(params int[] set) {
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Safe.ArgumentNotNull(set, "set");
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Token token = null;
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foreach(var c in set.Distinct())
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token = token == null ? new SymbolToken(c) : token.Or(new SymbolToken(c));
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return token;
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}
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}
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}
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