Token.cs
67 lines
| 2.0 KiB
| text/x-csharp
|
CSharpLexer
cin
|
r55 | using Implab; | ||
using System; | ||||
using System.Collections.Generic; | ||||
using System.Globalization; | ||||
using System.Linq; | ||||
using System.Text; | ||||
using System.Threading.Tasks; | ||||
namespace Implab.Parsing { | ||||
public abstract class Token { | ||||
public abstract void Accept(IVisitor visitor); | ||||
public Token Extend() { | ||||
return new CatToken(this, new EndToken()); | ||||
} | ||||
public Token Tag<T>(T tag) where T : IConvertible { | ||||
return new CatToken(this, new EndToken(tag.ToInt32(CultureInfo.InvariantCulture))); | ||||
} | ||||
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 new CatToken(this, 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( this.Optional() ); | ||||
return token; | ||||
} | ||||
public static Token New<T>(params T[] set) where T : struct, IConvertible { | ||||
Safe.ArgumentNotNull(set, "set"); | ||||
Token token = null; | ||||
foreach(var c in set.Distinct()) | ||||
token = token == null ? new SymbolToken(c.ToInt32(CultureInfo.InvariantCulture)) : token.Or(new SymbolToken(c.ToInt32(CultureInfo.InvariantCulture))); | ||||
return token; | ||||
} | ||||
} | ||||
} | ||||