Class Operation.OpCharClass

  • Enclosing class:

    public static class Operation.OpCharClass
    extends Operation
    A match of a single character in the input against a set of permitted characters
    • Method Detail

      • getPredicate

        public java.util.function.IntPredicate getPredicate()
      • getMatchLength

        public int getMatchLength()
        Description copied from class: Operation
        Get the length of the matches returned by this operation if they are fixed-length
        getMatchLength in class Operation
        the length of the matches, or -1 if the length is variable
      • matchesEmptyString

        public int matchesEmptyString()
        Description copied from class: Operation
        Ask whether the regular expression is known, after static analysis, to match a zero-length string
        Specified by:
        matchesEmptyString in class Operation
        a value indicating whether the regex is statically known to match a zero-length string. Specifically: Returning 0 means that it is not known statically whether or not the regex will match a zero-length string; this case typically arises when back-references are involved.
      • 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).
        getInitialCharacterClass in class Operation
        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
        matcher - supplies the context for the matching; may be updated with information about captured groups
        position - the start position to seek a match
        an iterator returning the endpoints of all matches starting at the supplied position
      • display

        public java.lang.String display()
        Display the operation as a regular expression, possibly in abbreviated form
        Specified by:
        display in class Operation
        the operation in a form that is recognizable as a regular expression or abbreviated regular expression