JFlex

Class RegExp

java.lang.Object

JFlex.RegExp

Direct Known Subclasses:

RegExp1, RegExp2

public class RegExp
extends java.lang.Object

Stores a regular expression of rules section in a JFlex-specification. This base class has no content other than its type.

Constructor Summary

Constructors

Constructor and Description
RegExp(int type) Create a new regular expression of the specified type.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isCharClass(Macros macros) Find out if this regexp is a char class or equivalent to one.
java.lang.String	print(java.lang.String tab) Returns a String-representation of this regular expression with the specified indentation.
int	size(Macros macros) The approximate number of NFA states this expression will need (only works correctly after macro expansion and without negation)
java.lang.String	toString() Returns a String-representation of this regular expression

Methods inherited from class java.lang.Object

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

Constructor Detail

RegExp

public RegExp(int type)

Create a new regular expression of the specified type.

Parameters:

type - a value from the cup generated class sym.

See Also:

sym

Method Detail

print

public java.lang.String print(java.lang.String tab)

Returns a String-representation of this regular expression with the specified indentation.

Parameters:

tab - a String that should contain only space characters and that is inserted in front of standard String-representation pf this object.

toString

public java.lang.String toString()

Returns a String-representation of this regular expression

Overrides:

toString in class java.lang.Object

isCharClass

public boolean isCharClass(Macros macros)

Find out if this regexp is a char class or equivalent to one.

Parameters:

macros - for macro expansion

Returns:

true if the regexp is equivalent to a char class.

size

public int size(Macros macros)

The approximate number of NFA states this expression will need (only works correctly after macro expansion and without negation)

Parameters:

macros - macro table for expansion