Method parse

base/src/main/java/net/time4j/calendar/Nengo.java:1450–1605

(
            CharSequence text,
            ParsePosition pp,
            AttributeQuery attributes
        )

        }

        @Override
        public Nengo parse(
            CharSequence text,
            ParsePosition pp,
            AttributeQuery attributes
        ) {

            Locale locale = attributes.get(Attributes.LANGUAGE, Locale.ROOT);
            TextWidth width = attributes.get(Attributes.TEXT_WIDTH, TextWidth.WIDE);
            Map<String, String> textForms = CalendarText.getInstance("japanese", locale).getTextForms();
            int offset = pp.getIndex();

            if (offset >= text.length()) {
                pp.setErrorIndex(offset);
                return null;
            }

            String query = (locale.getLanguage().equals("ru") ? capitalize(text, offset) : hepburn(text, offset));
            Nengo candidate = null;
            int len = 0;

            for (int i = 0; i < MODERN_KEYS.length; i++) {
                String key = MODERN_KEYS[i];
                if (width == TextWidth.NARROW) {
                    key = key + "_n";
                }
                String test = textForms.get(key);
                if (query.startsWith(test)) {
                    candidate = MODERN_NENGOS[i];
                    len = test.length();
                    if ((width != TextWidth.NARROW) && (candidate != SHOWA)) { // Shōwa is ambivalent!
                        pp.setIndex(offset + len);
                        return candidate;
                    } else {
                        break;
                    }
                }
            }

            if (query.length() < 2) { // NARROW
                if (candidate != null) {
                    pp.setIndex(offset + 1);
                }
                return candidate;
            }

            String prefix = null;
            int extra = 0;
            List<Nengo> candidates = Collections.emptyList();

            switch (locale.getLanguage()) {
                case "ja": {
                    int end = ((query.length() >= 4) ? 4 : 2);
                    String test = query.substring(0, end);
                    Nengo nengo = KANJI_TO_NENGO.get(test);
                    if ((nengo == null) && (end == 4)) {
                        test = query.substring(0, 2);
                        nengo = KANJI_TO_NENGO.get(test);