net.sf.saxon.regex

Class REProgram

java.lang.Object

net.sf.saxon.regex.REProgram

All Implemented Interfaces:

Serializable

public class REProgram
extends Object
implements Serializable

A class that holds compiled regular expressions.

Version:

$Id: REProgram.java 518156 2007-03-14 14:31:26Z vgritsenko $

Author:

Jonathan Locke

See Also:

REMatcher, RECompiler, Serialized Form

Constructor Summary

Constructors

Constructor and Description
REProgram(Operation[] instructions, int parens, REFlags flags) Constructs a program object from a character array

Method Summary

Methods

Modifier and Type	Method and Description
void	display(PrintStream out) Output a human-readable printout of the program
UnicodeString	getPrefix() Returns a copy of the prefix of current regular expression program in a character array.
boolean	isNullable() Ask whether the regular expression matches a zero length string
void	setNullable(boolean nullable) Say whether the regular expression matches a zero length string

Methods inherited from class java.lang.Object

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

Constructor Detail

REProgram

public REProgram(Operation[] instructions,
         int parens,
         REFlags flags)

Constructs a program object from a character array

Parameters:

parens - Count of parens in the program

instructions - Array with RE opcode instructions in it. The "next" pointers within the operations must already have been converted to absolute offsets.

Method Detail

isNullable

public boolean isNullable()

Ask whether the regular expression matches a zero length string

Returns:

true if the regex matches a zero length string

setNullable

public void setNullable(boolean nullable)

Say whether the regular expression matches a zero length string

Parameters:

nullable - true if the regex matches a zero length string

getPrefix

public UnicodeString getPrefix()

Returns a copy of the prefix of current regular expression program in a character array. If there is no prefix, or there is no program compiled yet, getPrefix will return null.

Returns:

A copy of the prefix of current compiled RE program

display

public void display(PrintStream out)

Output a human-readable printout of the program