Method encode

src/main/java/org/dynjs/runtime/builtins/URLCodec.java:14–77

(ExecutionContext context, String str, String unescapedSet)

    public static String URI_UNESCAPED_SET = URI_ALPHA + DECIMAL_DIGIT + URI_MARK;

    public static String encode(ExecutionContext context, String str, String unescapedSet) {
        int len = str.length();

        StringBuilder r = new StringBuilder();

        int k = 0;

        while (true) {
            if (k == len) {
                return r.toString();
            }

            char c = str.charAt(k);

            if (unescapedSet.contains("" + c)) {
                r.append(c);
            } else {

                if ((!(c < 0xDC00)) && (!(c > 0xDFFF))) {
                    throw new ThrowException(context, context.createUriError("invalid escape"));
                }

                long v = 0;

                if (c < 0xD800 || c > 0xDBFF) {
                    v = c;
                } else {
                    ++k;
                    if (k == len) {
                        throw new ThrowException(context, context.createUriError("invalid escape"));
                    }

                    char kChar = str.charAt(k);

                    if (kChar < 0xDC00 || kChar > 0xDFFF) {
                        throw new ThrowException(context, context.createUriError("invalid escape"));
                    }

                    v = ((c - 0xD800) * 0x400 + (kChar - 0xDC00) + 0x10000);
                }

                if (v < 0x80) {
                    r.append(String.format("%%%02X", v));
                } else if (v < 0x800) {
                    int o1 = (int) ((v >> 6) | 0xC0);
                    int o2 = (int) ((v & 0x3F) | 0x80);
                    r.append(String.format("%%%02X%%%02X", o1, o2));
                } else if (v <= 0xFFFF) {
                    int o1 = (int) (((v >> 12) & 0x1F) | 0xE0);
                    int o2 = (int) (((v >> 6) & 0x3F) | 0x80);
                    int o3 = (int) ((v & 0x3F) | 0x80);
                    r.append(String.format("%%%02X%%%02X%%%02X", o1, o2, o3));
                } else if (v <= 0x10FFFF) {
                    int o1 = (int) (((v >> 18) & 0x07) | 0xF0);
                    int o2 = (int) (((v >> 12) & 0x3F) | 0x80);
                    int o3 = (int) (((v >> 6) & 0x3F) | 0x80);
                    int o4 = (int) ((v & 0x3F) | 0x80);
                    r.append(String.format("%%%02X%%%02X%%%02X%%%02X", o1, o2, o3, o4));