Method toString

src/main/java/org/dynjs/runtime/Types.java:403–474

(ExecutionContext context, Object o)

    private static Pattern EXP_PATTERN = Pattern.compile("^(.*)e([+-])([0-9]+)$");
    public static String toString(ExecutionContext context, Object o) {
        if (o == Types.UNDEFINED) {
            return "undefined";
        }

        if (o == Types.NULL || o == null) {
            return "null";
        }

        if (o instanceof JSObject) {
            return (String) toString(context, toPrimitive(context, o, "String"));
        }
        if (o instanceof Number) {
            if (((Number) o).doubleValue() == -0) {
                return "0";
            }

            if (o instanceof Double) {
                Double dbl = (Double) o;
                if (dbl.doubleValue() == (long) dbl.doubleValue()) {
                    o = dbl.longValue();
                }
            }
            String result = Types.rewritePossiblyExponentialValue(o.toString());

            Matcher matcher = EXP_PATTERN.matcher(result);
            if (matcher.matches()) {
                int expValue = Integer.parseInt(matcher.group(3));
                if (matcher.group(2).equals("+")) {
                    if (expValue <= 20) {
                        String digits = matcher.group(1).replace(".", "");
                        StringBuilder newResult = new StringBuilder();
                        int offset = 0;
                        if (digits.startsWith("-")) {
                            newResult.append("-");
                            offset = 1;
                        }
                        for (int i = offset; i <= expValue; ++i) {
                            if (i >= digits.length()) {
                                newResult.append("0");
                            } else {
                                newResult.append(digits.charAt(i));
                            }
                        }
                        if (newResult.length() < digits.length()) {
                            newResult.append(".");
                            newResult.append(digits.substring(newResult.length() - 1));
                        }
                        result = newResult.toString();
                    }
                } else {
                    if (expValue <= 6) {
                        StringBuilder newResult = new StringBuilder().append("0.");
                        for (int i = 0; i < (expValue - 1); ++i) {
                            newResult.append(0);
                        }

                        String digits = matcher.group(1).replace(".", "");