package org.skyscreamer.jsonassert;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONString;
/**
* Simple JSON parsing utility.
*/
public class JSONParser {
// regular expression to match a number in JSON format. see http://www.json.org/fatfree.html.
// "A number can be represented as integer, real, or floating point. JSON does not support octal or hex
// ... [or] NaN or Infinity".
private static final String NUMBER_REGEX = "-?(?:0|[1-9]\\d*)(?:\\.\\d+)?(?:[eE][+-]?\\d+)?";
private JSONParser() {}
/**
* Takes a JSON string and returns either a {@link org.json.JSONObject} or {@link org.json.JSONArray},
* depending on whether the string represents an object or an array.
*
* @param s Raw JSON string to be parsed
* @return JSONObject or JSONArray
* @throws JSONException
*/
public static Object parseJSON(final String s) throws JSONException {
if (s.trim().startsWith("{")) {
return new JSONObject(s);
}
else if (s.trim().startsWith("[")) {
return new JSONArray(s);
} else if (s.trim().startsWith("\"")
|| s.trim().matches(NUMBER_REGEX)) {
return new JSONString() {
@Override
public String toJSONString() {
return s;
}
};
}
throw new JSONException("Unparsable JSON string: " + s);
}
}