net.sf.saxon.regex

Class Operation.OpAtom

java.lang.Object

net.sf.saxon.regex.Operation

net.sf.saxon.regex.Operation.OpAtom

Enclosing class:

Operation

public static class Operation.OpAtom
extends Operation

A match against a fixed string of any length

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
OpAtom(UnicodeString atom)

Method Summary

Modifier and Type	Method and Description
java.lang.String	display() Display the operation as a regular expression, possibly in abbreviated form
UnicodeString	getAtom()
CharacterClass	getInitialCharacterClass(boolean caseBlind) Get a CharacterClass identifying the set of characters that can appear as the first character of a non-empty string that matches this term.
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

containsCapturingExpressions, getMinimumMatchLength, optimize

Methods inherited from class java.lang.Object

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

Constructor Detail

OpAtom

public OpAtom(UnicodeString atom)

Method Detail

getAtom

public UnicodeString getAtom()

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

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

getInitialCharacterClass

public CharacterClass getInitialCharacterClass(boolean caseBlind)

Description copied from class: Operation

Get a CharacterClass identifying the set of characters that can appear as the first character of a non-empty string that matches this term. This is allowed to be an over-estimate (that is, the returned Character class must match every character that can legitimately appear at the start of the matched string, but it can also match other characters).

Overrides:

getInitialCharacterClass in class Operation

Parameters:

caseBlind - true if case-blind matching is in force ("i" flag)

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

display

public java.lang.String display()

Description copied from class: Operation

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