net.sf.saxon.regex

Class REProgram

java.lang.Object

net.sf.saxon.regex.REProgram

public class REProgram
extends Object

A class that holds compiled regular expressions.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	backtrackingLimit
(package private) int	fixedLength
(package private) REFlags	flags
(package private) IntPredicate	initialCharClass
(package private) int	maxParens
(package private) int	minimumLength
(package private) Operation	operation
(package private) static int	OPT_HASBACKREFS
(package private) static int	OPT_HASBOL
(package private) int	optimizationFlags
(package private) List<RegexPrecondition>	preconditions
(package private) UnicodeString	prefix

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
int	getBacktrackingLimit()
UnicodeString	getPrefix() Returns a copy of the prefix of current regular expression program in a character array.
boolean	isNullable() Ask whether the regular expression is known statically to match a zero length string
void	setBacktrackingLimit(int limit)

Methods inherited from class java.lang.Object

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

Field Detail

OPT_HASBACKREFS

static final int OPT_HASBACKREFS

See Also:

Constant Field Values

OPT_HASBOL

static final int OPT_HASBOL

See Also:

Constant Field Values

operation

Operation operation

flags

REFlags flags

prefix

UnicodeString prefix

initialCharClass

IntPredicate initialCharClass

preconditions

List<RegexPrecondition> preconditions

minimumLength

int minimumLength

fixedLength

int fixedLength

optimizationFlags

int optimizationFlags

maxParens

int maxParens

backtrackingLimit

int backtrackingLimit

Constructor Detail

REProgram

public REProgram(Operation operation,
                 int parens,
                 REFlags flags)

Constructs a program object from a character array

Parameters:

operation - Array with RE opcode instructions in it. The "next"

parens - Count of parens in the program pointers within the operations must already have been converted to absolute offsets.

flags - the regular expression flags

Method Detail

setBacktrackingLimit

public void setBacktrackingLimit(int limit)

getBacktrackingLimit

public int getBacktrackingLimit()

isNullable

public boolean isNullable()

Ask whether the regular expression is known statically to match a zero length string

Returns:

true if the regex is known statically to match a zero length string. If the result is true, then there is definitely a match; if the result is false, then it is not known statically whether there is a match (this arises when the expression contains back-references).

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