JFlex

Class RegExp

public class RegExp extends Object

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

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

Method Summary
RegExp	anyChar() Returns a regexp that matches any character: `[^]`
boolean	isCharClass(Macros macros) Find out if this regexp is a char class or equivalent to one.
String	print(String tab) Returns a String-representation of this regular expression with the specified indentation.
RegExp	resolveTilde(Macros macros) Recursively convert tilde (upto) expressions into negation and star.
RegExp	rev(Macros macros) Create a new regexp that matches the reverse text of this one.
static String	revString(String s)
int	size(Macros macros) The approximate number of NFA states this expression will need (only works correctly after macro expansion and without negation)
String	toString() Returns a String-representation of this regular expression

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

anyChar

public RegExp anyChar()

Returns a regexp that matches any character: [^]

Returns: the regexp for [^]

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.

print

public String print(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.

resolveTilde

public final RegExp resolveTilde(Macros macros)

Recursively convert tilde (upto) expressions into negation and star.

Parameters: macros the macro table for expansion.

Returns: new RegExp equivalent to the current one, but without upto expressions.

rev

public final RegExp rev(Macros macros)

Create a new regexp that matches the reverse text of this one.

Returns: the reverse regexp

revString

public static final String revString(String s)

Returns: the reverse of the specified string.

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

toString

public String toString()

Returns a String-representation of this regular expression