net.sf.saxon.regex

Class Operation.OpNothing

java.lang.Object

net.sf.saxon.regex.Operation

net.sf.saxon.regex.Operation.OpNothing

Enclosing class:

Operation

public static class Operation.OpNothing
extends Operation

Match empty string

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.saxon.regex.Operation

Operation.OpAtom, Operation.OpBackReference, Operation.OpBOL, Operation.OpCapture, Operation.OpCharClass, Operation.OpChoice, Operation.OpEndProgram, Operation.OpEOL, Operation.OpGreedyFixed, Operation.OpNothing, Operation.OpReluctantFixed, Operation.OpRepeat, Operation.OpSequence, Operation.OpTrace, Operation.OpUnambiguousRepeat

Constructor Summary

Constructors

Constructor and Description
Operation.OpNothing()

Method Summary

Methods

Modifier and Type	Method and Description
String	display() Display the operation as a regular expression, possibly in abbreviated form
int	getMatchLength() Get the length of the matches returned by this operation if they are fixed-length
IntIterator	iterateMatches(REMatcher matcher, int position) Get an iterator returning all the matches for this operation
boolean	matchesEmptyString() Ask whether the regular expression is capable of matching a zero-length string

Methods inherited from class net.sf.saxon.regex.Operation

getMinimumMatchLength, optimize

Methods inherited from class java.lang.Object

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

Constructor Detail

Operation.OpNothing

public Operation.OpNothing()

Method Detail

iterateMatches

public IntIterator iterateMatches(REMatcher matcher,
                         int position)

Description copied from class: Operation

Get an iterator returning all the matches for this operation

Specified by:

iterateMatches in class Operation

Parameters:

matcher - supplies the context for the matching; may be updated with information about captured groups

position - the start position to seek a match

Returns:

an iterator returning the endpoints of all matches starting at the supplied position

matchesEmptyString

public boolean matchesEmptyString()

Description copied from class: Operation

Ask whether the regular expression is capable of matching a zero-length string

Specified by:

matchesEmptyString in class Operation

Returns:

true if the regex matches a zero-length string

getMatchLength

public int getMatchLength()

Description copied from class: Operation

Get the length of the matches returned by this operation if they are fixed-length

Overrides:

getMatchLength in class Operation

Returns:

the length of the matches, or -1 if the length is variable

display

public String display()

Display the operation as a regular expression, possibly in abbreviated form

Specified by:

display in class Operation

Returns:

the operation in a form that is recognizable as a regular expression or abbreviated regular expression