Method parseOne

shared/java/FontFeature.java:64–75

(String s)

    public static final Pattern _featurePattern = Pattern.compile("(?<sign>[-+])?(?<tag>[a-z0-9]{4})(?:\\[(?<start>\\d+)?:(?<end>\\d+)?\\])?(?:=(?<value>\\d+))?");

    public static FontFeature parseOne(String s) {
        Matcher m = _featurePattern.matcher(s);
        if (!m.matches())
            throw new IllegalArgumentException("Can’t parse FontFeature: " + s);
        int value = m.group("value") != null ? Integer.parseInt(m.group("value"))
                    : m.group("sign") == null ? 1
                    : "-".equals(m.group("sign")) ? 0
                    : 1;
        long start = m.group("start") == null ? 0 : Long.parseLong(m.group("start"));
        long end = m.group("end") == null ? Long.MAX_VALUE : Long.parseLong(m.group("end"));
        return new FontFeature(m.group("tag"), value, start, end);
    }

    public static FontFeature[] parse(String s) {
        return _splitPattern.splitAsStream(s).map(FontFeature::parseOne).toArray(FontFeature[]::new);