|
|
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;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
