Method parse

base/src/main/java/net/time4j/range/YearParser.java:42–165

(
        CharSequence text,
        ParseLog status,
        AttributeQuery attributes
    )

    //~ Methoden ----------------------------------------------------------

    @Override
    public Integer parse(
        CharSequence text,
        ParseLog status,
        AttributeQuery attributes
    ) {

        Leniency leniency = attributes.get(Attributes.LENIENCY, Leniency.SMART);

        int effectiveMin = 1;
        int effectiveMax = 9;

        if (!leniency.isLax()) {
            effectiveMin = 4;
        }

        int len = text.length();
        int start = status.getPosition();
        int pos = start;

        int protectedChars =
            attributes.get(Attributes.PROTECTED_CHARACTERS, 0).intValue();

        if (protectedChars > 0) {
            len -= protectedChars;
        }

        if (pos >= len) {
            status.setError(start, "Missing digits for: " + this.name());
            status.setWarning();
            return null;
        }

        boolean negative = false;
        char sign = text.charAt(pos);

        if (
            (sign == '-')
            || (sign == '+')
        ) {
            negative = (sign == '-');
            pos++;
            start++;
        }

        if (pos >= len) {
            status.setError(start, "Missing digits for: " + this.name());
            return null;
        }

        int minPos = pos + effectiveMin;
        int maxPos = Math.min(len, pos + effectiveMax);
        int total = 0;
        boolean first = true;

        while (pos < maxPos) {
            int digit = text.charAt(pos) - '0';