json_tool.h

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// Copyright 2007-2010 Baptiste Lepilleur
// Distributed under MIT license, or public domain if desired and
// recognized in your jurisdiction.
// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE

#ifndef LIB_JSONCPP_JSON_TOOL_H_INCLUDED
#define LIB_JSONCPP_JSON_TOOL_H_INCLUDED

#ifndef NO_LOCALE_SUPPORT
#include <clocale>
#endif

/* This header provides common string manipulation support, such as UTF-8,
 * portable conversion from/to string...
 *
 * It is an internal header that must not be exposed.
 */

namespace Json {
static char getDecimalPoint() {
#ifdef NO_LOCALE_SUPPORT
  return '\0';
#else
  struct lconv* lc = localeconv();
  return lc ? *(lc->decimal_point) : '\0';
#endif
}

static inline JSONCPP_STRING codePointToUTF8(unsigned int cp) {
  JSONCPP_STRING result;

  // based on description from http://en.wikipedia.org/wiki/UTF-8

  if (cp <= 0x7f) {
    result.resize(1);
    result[0] = static_cast<char>(cp);
  } else if (cp <= 0x7FF) {
    result.resize(2);
    result[1] = static_cast<char>(0x80 | (0x3f & cp));
    result[0] = static_cast<char>(0xC0 | (0x1f & (cp >> 6)));
  } else if (cp <= 0xFFFF) {
    result.resize(3);
    result[2] = static_cast<char>(0x80 | (0x3f & cp));
    result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
    result[0] = static_cast<char>(0xE0 | (0xf & (cp >> 12)));
  } else if (cp <= 0x10FFFF) {
    result.resize(4);
    result[3] = static_cast<char>(0x80 | (0x3f & cp));
    result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
    result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
    result[0] = static_cast<char>(0xF0 | (0x7 & (cp >> 18)));
  }

  return result;
}

static inline bool isControlCharacter(char ch) { return ch > 0 && ch <= 0x1F; }

enum {
  uintToStringBufferSize = 3 * sizeof(LargestUInt) + 1
};

// Defines a char buffer for use with uintToString().
typedef char UIntToStringBuffer[uintToStringBufferSize];

static inline void uintToString(LargestUInt value, char*& current) {
  *--current = 0;
  do {
    *--current = static_cast<char>(value % 10U + static_cast<unsigned>('0'));
    value /= 10;
  } while (value != 0);
}

static inline void fixNumericLocale(char* begin, char* end) {
  while (begin < end) {
    if (*begin == ',') {
      *begin = '.';
    }
    ++begin;
  }
}

static inline void fixNumericLocaleInput(char* begin, char* end) {
  char decimalPoint = getDecimalPoint();
  if (decimalPoint != '\0' && decimalPoint != '.') {
    while (begin < end) {
      if (*begin == '.') {
        *begin = decimalPoint;
      }
      ++begin;
    }
  }
}

} // namespace Json {

#endif // LIB_JSONCPP_JSON_TOOL_H_INCLUDED