Package net.sf.saxon.regex

Class RegexPrecondition

java.lang.Object

net.sf.saxon.regex.RegexPrecondition

public class RegexPrecondition
extends Object

A precondition that must be true if a regular expression is to match

Field Summary

Fields

Modifier and Type	Field	Description
int	fixedPosition
int	minPosition
Operation	operation

Constructor Summary

Constructors

Constructor	Description
RegexPrecondition(Operation op, int fixedPos, int minPos)	Create a precondition for a regular expression to be true

Method Summary

Methods inherited from class java.lang.Object

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

Field Details

operation

public Operation operation

fixedPosition

public int fixedPosition

minPosition

public int minPosition

Constructor Details

RegexPrecondition

public RegexPrecondition(Operation op,
 int fixedPos,
 int minPos)

Create a precondition for a regular expression to be true

Parameters:

op - the operation to be performed. The precondition is true if op.iterateMatches(p).hasNext() is true at some position p, subject to the constraints in the other two arguments

fixedPos - indicates that the operation only needs to be tested at this position. Used when all previous parts of the regular expression are fixed length, and the regex starts with a "^" anchor. Defaults to -1, indicating that the operation needs to be tested at every position.

minPos - indicates that the operation needs to be tested at this position and all subsequent positions within the input string (until a match is found or the end of the string is reached). Defaults to 0.