org.stekikun.dolmen.syntax

Class Regular.Epsilon

java.lang.Object

org.stekikun.dolmen.syntax.Regular

org.stekikun.dolmen.syntax.Regular.Epsilon

Enclosing class:

Regular

public static final class Regular.Epsilon
extends Regular

The singleton class that stands for the empty regular expression ε, which only matches the empty string.

Author:

Stéphane Lescuyer

Nested Class Summary

Nested classes/interfaces inherited from class org.stekikun.dolmen.syntax.Regular

Regular.Alternate, Regular.Binding, Regular.Characters, Regular.Eof, Regular.Epsilon, Regular.Folder<V>, Regular.Gen, Regular.Kind, Regular.Repetition, Regular.Sequence

Field Summary

Fields

Modifier and Type	Field and Description
protected static Regular.Epsilon	INSTANCE

Fields inherited from class org.stekikun.dolmen.syntax.Regular

EOF, EPSILON, hasBindings, kind, nullable, size

Method Summary

Modifier and Type	Method and Description
<V> V	fold(Regular.Folder<V> folder)
@NonNull String	toString()

Methods inherited from class org.stekikun.dolmen.syntax.Regular

binding, chars, generator, getKind, or, or, plus, repeat, repeat, seq, seq, star, string

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

protected static final Regular.Epsilon INSTANCE

Method Detail

fold

public <V> V fold(Regular.Folder<V> folder)

Specified by:

fold in class Regular

Returns:

the result of applying the provided Regular.Folder to the receiver

toString

public @NonNull String toString()

Specified by:

toString in class Regular