protected CharSequence trimFWS()

in main/src/main/java/org/apache/james/jdkim/tagvalue/TagValue.java [62:105]
40 lines of code
24 McCabe index (conditional complexity)

    protected CharSequence trimFWS(CharSequence data, int tStart, int tStop,
            boolean trimWSP) {
        if (DEBUG)
            System.out.println("1[" + data + "]" + tStart + "|" + tStop + "="
                    + data.subSequence(tStart, tStop + 1) + "]");
        // rimozione di FWS a inizio selezione
        while (tStart < tStop
                && (data.charAt(tStart) == ' ' || data.charAt(tStart) == '\t')
                || (tStart < tStop - 2 && data.charAt(tStart) == '\r'
                        && data.charAt(tStart + 1) == '\n' && (data
                        .charAt(tStart + 2) == ' ' || data.charAt(tStart + 2) == '\t'))) {
            if (data.charAt(tStart) == '\r')
                tStart += 3;
            else
                tStart++;
        }

        if (DEBUG)
            System.out.println("2[" + data + "]" + tStart + "|" + tStop + "="
                    + data.subSequence(tStart, tStop + 1) + "]");
        // rimozione di FWS a fine selezione.
        while (tStart < tStop
                && (data.charAt(tStop) == ' ' || data.charAt(tStop) == '\t')) {
            tStop--;
            while ((tStart <= tStop - 1 && data.charAt(tStop) == '\n' && data
                    .charAt(tStop - 1) == '\r')
                    || (tStart < tStop && (data.charAt(tStop) == ' ' || data
                            .charAt(tStop) == '\t'))) {
                if (data.charAt(tStop) == '\n')
                    tStop -= 2;
                else
                    tStop--;
            }
        }

        if (DEBUG)
            System.out.println("3[" + data + "]" + tStart + "|" + tStop + "="
                    + data.subSequence(tStart, tStop + 1) + "]");
        if (trimWSP) {
            return trimWSP(data, tStart, tStop);
        } else {
            return data.subSequence(tStart, tStop + 1);
        }
    }