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Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler...
Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler Any unhandled OperationCanceledException will cause the promise cancelation
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r178:d5c5db0335ee ref20160224
r187:dd4a3590f9c6 ref20160224
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Token.cs
63 lines | 1.7 KiB | text/x-csharp | CSharpLexer
/ Implab / Automaton / RegularExpressions / Token.cs
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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;
}
}
}