private static int wildCompareInternal()

in src/main/core-api/java/com/mysql/cj/util/StringUtils.java [884:988]
80 lines of code
33 McCabe index (conditional complexity)

    private static int wildCompareInternal(String searchIn, String searchFor) {
        if (searchIn == null || searchFor == null) {
            return WILD_COMPARE_NO_MATCH;
        }

        if (searchFor.equals("%")) {
            return WILD_COMPARE_MATCH;
        }

        int searchForPos = 0;
        int searchForEnd = searchFor.length();

        int searchInPos = 0;
        int searchInEnd = searchIn.length();

        int result = WILD_COMPARE_NO_MATCH; /* Not found, using wildcards */

        while (searchForPos != searchForEnd) {
            while (searchFor.charAt(searchForPos) != WILDCARD_MANY && searchFor.charAt(searchForPos) != WILDCARD_ONE) {
                if (searchFor.charAt(searchForPos) == WILDCARD_ESCAPE && searchForPos + 1 != searchForEnd) {
                    searchForPos++;
                }

                if (searchInPos == searchInEnd
                        || Character.toUpperCase(searchFor.charAt(searchForPos++)) != Character.toUpperCase(searchIn.charAt(searchInPos++))) {
                    return WILD_COMPARE_CONTINUE_WITH_WILD; /* No match */
                }

                if (searchForPos == searchForEnd) {
                    return searchInPos != searchInEnd ? WILD_COMPARE_CONTINUE_WITH_WILD : WILD_COMPARE_MATCH; /* Match if both are at end */
                }

                result = WILD_COMPARE_CONTINUE_WITH_WILD; /* Found an anchor char */
            }

            if (searchFor.charAt(searchForPos) == WILDCARD_ONE) {
                do {
                    if (searchInPos == searchInEnd) { /* Skip one char if possible */
                        return result;
                    }
                    searchInPos++;
                } while (++searchForPos < searchForEnd && searchFor.charAt(searchForPos) == WILDCARD_ONE);

                if (searchForPos == searchForEnd) {
                    break;
                }
            }

            if (searchFor.charAt(searchForPos) == WILDCARD_MANY) { /* Found w_many */
                searchForPos++;

                /* Remove any '%' and '_' from the wild search string */
                for (; searchForPos != searchForEnd; searchForPos++) {
                    if (searchFor.charAt(searchForPos) == WILDCARD_MANY) {
                        continue;
                    }

                    if (searchFor.charAt(searchForPos) == WILDCARD_ONE) {
                        if (searchInPos == searchInEnd) { /* Skip one char if possible */
                            return WILD_COMPARE_NO_MATCH;
                        }
                        searchInPos++;
                        continue;
                    }

                    break; /* Not a wild character */
                }

                if (searchForPos == searchForEnd) {
                    return WILD_COMPARE_MATCH; /* Ok if w_many is last */
                }

                if (searchInPos == searchInEnd) {
                    return WILD_COMPARE_NO_MATCH;
                }

                char cmp;
                if ((cmp = searchFor.charAt(searchForPos)) == WILDCARD_ESCAPE && searchForPos + 1 != searchForEnd) {
                    cmp = searchFor.charAt(++searchForPos);
                }

                searchForPos++;

                do {
                    while (searchInPos != searchInEnd && Character.toUpperCase(searchIn.charAt(searchInPos)) != Character.toUpperCase(cmp)) {
                        searchInPos++;
                    } /* Searches for an anchor char */

                    if (searchInPos++ == searchInEnd) {
                        return WILD_COMPARE_NO_MATCH;
                    }

                    int tmp = wildCompareInternal(searchIn.substring(searchInPos), searchFor.substring(searchForPos));
                    if (tmp <= 0) {
                        return tmp;
                    }

                } while (searchInPos != searchInEnd);

                return WILD_COMPARE_NO_MATCH;
            }
        }

        return searchInPos != searchInEnd ? WILD_COMPARE_CONTINUE_WITH_WILD : WILD_COMPARE_MATCH;
    }