text: // Copyright 2014 BitPay Inc.
  // Copyright 2015 Elecric Cash Core Developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <stdint.h>
  #include <errno.h>
  #include <string.h>
  #include <stdlib.h>
  #include <stdexcept>
  #include <vector>
  #include <limits>
  #include <string>
  
  #include "univalue.h"
  
  namespace
  {
  static bool ParsePrechecks(const std::string& str)
  {
      if (str.empty()) // No empty string allowed
          return false;
      if (str.size() >= 1 && (json_isspace(str[0]) || json_isspace(str[str.size()-1]))) // No padding allowed
          return false;
      if (str.size() != strlen(str.c_str())) // No embedded NUL characters allowed
          return false;
      return true;
  }
  
  bool ParseInt32(const std::string& str, int32_t *out)
  {
      if (!ParsePrechecks(str))
          return false;
      char *endp = NULL;
      errno = 0; // strtol will not set errno if valid
      long int n = strtol(str.c_str(), &endp, 10);
      if(out) *out = (int32_t)n;
      // Note that strtol returns a *long int*, so even if strtol doesn't report an over/underflow
      // we still have to check that the returned value is within the range of an *int32_t*. On 64-bit
      // platforms the size of these types may be different.
      return endp && *endp == 0 && !errno &&
          n >= std::numeric_limits<int32_t>::min() &&
          n <= std::numeric_limits<int32_t>::max();
  }
  
  bool ParseInt64(const std::string& str, int64_t *out)
  {
      if (!ParsePrechecks(str))
          return false;
      char *endp = NULL;
      errno = 0; // strtoll will not set errno if valid
      long long int n = strtoll(str.c_str(), &endp, 10);
      if(out) *out = (int64_t)n;
      // Note that strtoll returns a *long long int*, so even if strtol doesn't report a over/underflow
      // we still have to check that the returned value is within the range of an *int64_t*.
      return endp && *endp == 0 && !errno &&
          n >= std::numeric_limits<int64_t>::min() &&
          n <= std::numeric_limits<int64_t>::max();
  }
  
  bool ParseDouble(const std::string& str, double *out)
  {
      if (!ParsePrechecks(str))
          return false;
      if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') // No hexadecimal floats allowed
          return false;
      std::istringstream text(str);
      text.imbue(std::locale::classic());
      double result;
      text >> result;
      if(out) *out = result;
      return text.eof() && !text.fail();
  }
  }
  
  const std::vector<std::string>& UniValue::getKeys() const
  {
      if (typ != VOBJ)
          throw std::runtime_error("JSON value is not an object as expected");
      return keys;
  }
  
  const std::vector<UniValue>& UniValue::getValues() const
  {
      if (typ != VOBJ && typ != VARR)
          throw std::runtime_error("JSON value is not an object or array as expected");
      return values;
  }
  
  bool UniValue::get_bool() const
  {
      if (typ != VBOOL)
          throw std::runtime_error("JSON value is not a boolean as expected");
      return getBool();
  }
  
  const std::string& UniValue::get_str() const
  {
      if (typ != VSTR)
          throw std::runtime_error("JSON value is not a string as expected");
      return getValStr();
  }
  
  int UniValue::get_int() const
  {
      if (typ != VNUM)
          throw std::runtime_error("JSON value is not an integer as expected");
      int32_t retval;
      if (!ParseInt32(getValStr(), &retval))
          throw std::runtime_error("JSON integer out of range");
      return retval;
  }
  
  int64_t UniValue::get_int64() const
  {
      if (typ != VNUM)
          throw std::runtime_error("JSON value is not an integer as expected");
      int64_t retval;
      if (!ParseInt64(getValStr(), &retval))
          throw std::runtime_error("JSON integer out of range");
      return retval;
  }
  
  double UniValue::get_real() const
  {
      if (typ != VNUM)
          throw std::runtime_error("JSON value is not a number as expected");
      double retval;
      if (!ParseDouble(getValStr(), &retval))
          throw std::runtime_error("JSON double out of range");
      return retval;
  }
  
  const UniValue& UniValue::get_obj() const
  {
      if (typ != VOBJ)
          throw std::runtime_error("JSON value is not an object as expected");
      return *this;
  }
  
  const UniValue& UniValue::get_array() const
  {
      if (typ != VARR)
          throw std::runtime_error("JSON value is not an array as expected");
      return *this;
  }
  
  