boolean matchAnchor()

in src/org/apache/xerces/impl/xpath/regex/RegularExpression.java [1441:1530]
79 lines of code
52 McCabe index (conditional complexity)

    boolean matchAnchor(ExpressionTarget target, Op op, Context con, int offset, int opts) {
        boolean go = false;
        switch (op.getData()) {
        case '^':
            if (isSet(opts, MULTIPLE_LINES)) {
                if (!(offset == con.start
                      || offset > con.start && offset < con.limit && isEOLChar(target.charAt(offset-1))))
                    return false;
            } else {
                if (offset != con.start)
                    return false;
            }
            break;

        case '@':                         // Internal use only.
            // The @ always matches line beginnings.
            if (!(offset == con.start
                  || offset > con.start && isEOLChar(target.charAt(offset-1))))
                return false;
            break;

        case '$':
            if (isSet(opts, MULTIPLE_LINES)) {
                if (!(offset == con.limit
                      || offset < con.limit && isEOLChar(target.charAt(offset))))
                    return false;
            } else {
                if (!(offset == con.limit
                      || offset+1 == con.limit && isEOLChar(target.charAt(offset))
                      || offset+2 == con.limit &&  target.charAt(offset) == CARRIAGE_RETURN
                      &&  target.charAt(offset+1) == LINE_FEED))
                    return false;
            }
            break;

        case 'A':
            if (offset != con.start)  return false;
            break;

        case 'Z':
            if (!(offset == con.limit
                  || offset+1 == con.limit && isEOLChar(target.charAt(offset))
                  || offset+2 == con.limit &&  target.charAt(offset) == CARRIAGE_RETURN
                  &&  target.charAt(offset+1) == LINE_FEED))
                return false;
            break;

        case 'z':
            if (offset != con.limit)  return false;
            break;

        case 'b':
            if (con.length == 0) 
                return false;
            {
                int after = getWordType(target, con.start, con.limit, offset, opts);
                if (after == WT_IGNORE)  return false;
                int before = getPreviousWordType(target, con.start, con.limit, offset, opts);
                if (after == before)  return false;
            }
            break;

        case 'B':
            if (con.length == 0)
                go = true;
            else {
                int after = getWordType(target, con.start, con.limit, offset, opts);
                go = after == WT_IGNORE
                     || after == getPreviousWordType(target, con.start, con.limit, offset, opts);
            }
            if (!go)  return false;
            break;

        case '<':
            if (con.length == 0 || offset == con.limit)  return false;
            if (getWordType(target, con.start, con.limit, offset, opts) != WT_LETTER
                || getPreviousWordType(target, con.start, con.limit, offset, opts) != WT_OTHER)
                return false;
            break;

        case '>':
            if (con.length == 0 || offset == con.start)  return false;
            if (getWordType(target, con.start, con.limit, offset, opts) != WT_OTHER
                || getPreviousWordType(target, con.start, con.limit, offset, opts) != WT_LETTER)
                return false;
            break;
        } // switch anchor type
        
        return true;
    }