Package net.sf.saxon.regex
Class Operation.OpCapture
- java.lang.Object
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- net.sf.saxon.regex.Operation
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- net.sf.saxon.regex.Operation.OpCapture
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Nested Class Summary
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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
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Stringdisplay()Display the operation as a regular expression, possibly in abbreviated formintgetMatchLength()Get the length of the matches returned by this operation if they are fixed-lengthintgetMinimumMatchLength()Get the minimum length of the matches returned by this operationIntIteratoriterateMatches(REMatcher matcher, int position)Get an iterator returning all the matches for this operationintmatchesEmptyString()Ask whether the regular expression is known, after static analysis, to match a zero-length stringOperationoptimize(REProgram program, REFlags flags)Optimize the operation-
Methods inherited from class net.sf.saxon.regex.Operation
containsCapturingExpressions, getInitialCharacterClass
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Method Detail
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getMatchLength
public int getMatchLength()
Description copied from class:OperationGet the length of the matches returned by this operation if they are fixed-length- Overrides:
getMatchLengthin classOperation- Returns:
- the length of the matches, or -1 if the length is variable
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getMinimumMatchLength
public int getMinimumMatchLength()
Description copied from class:OperationGet the minimum length of the matches returned by this operation- Overrides:
getMinimumMatchLengthin classOperation- Returns:
- the length of the shortest string that will match the operation
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matchesEmptyString
public int matchesEmptyString()
Description copied from class:OperationAsk whether the regular expression is known, after static analysis, to match a zero-length string- Specified by:
matchesEmptyStringin classOperation- Returns:
- a value indicating whether the regex is statically known to match
a zero-length string. Specifically:
- returns
Operation.MATCHES_ZLS_AT_STARTif the expression is statically known to match a zero-length string at the start of the supplied input; - returns
Operation.MATCHES_ZLS_AT_ENDif it is statically known to return a zero-length string at the end of the supplied input; - returns
Operation.MATCHES_ZLS_ANYWHEREif it is statically known to match a zero-length string anywhere in the input. - returns
Operation.MATCHES_ZLS_NEVERif it is statically known that the regex will never match a zero length string.
- returns
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optimize
public Operation optimize(REProgram program, REFlags flags)
Description copied from class:OperationOptimize the operation
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iterateMatches
public IntIterator iterateMatches(REMatcher matcher, int position)
Description copied from class:OperationGet an iterator returning all the matches for this operation- Specified by:
iterateMatchesin classOperation- Parameters:
matcher- supplies the context for the matching; may be updated with information about captured groupsposition- the start position to seek a match- Returns:
- an iterator returning the endpoints of all matches starting at the supplied position
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