Method stringToNumber

src/main/java/org/dynjs/runtime/Types.java:216–263

(String str)

    static final Pattern decimalDigitPattern = Pattern.compile(".*[0-9].*");
    public static Number stringToNumber(String str) {
        str = trimNumericString(str);

        if (str.equals("")) {
            return 0L;
        }

        if (str.equals("-0")) {
            return Double.valueOf(-0.0);
        }

        if (str.equals("Infinity") || str.equals("+Infinity")) {
            return Math.pow(10, 10000);
        }

        if (str.equals("-Infinity")) {
            return -Math.pow(10, 10000);
        }

        if (str.startsWith("0x") || str.startsWith("0X")) {
            return Long.decode(str);
        }

        // If we've come this far and there's not a decimal digit in
        // this string anywhere then bail out early
        if (!decimalDigitPattern.matcher(str).matches()) {
            return Double.NaN;
        }

        if ((str.indexOf("e") > 0) || (str.indexOf("E") > 0)) {
            if (str.indexOf(".") >= 0) {
                str = str.replaceFirst("[eE]", "E");
            } else {
                str = str.replaceFirst("[eE]", ".0E");
            }
        }

        try {
            if (str.indexOf(".") >= 0) {
                return Double.valueOf(str);
            } else {
                return Long.valueOf(str);
            }
        } catch (NumberFormatException e) {
            return Double.NaN;
        }

    }

    public static Boolean toBoolean(Object o) {
        // 9.2