88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
// Copyright 2007-2010 Baptiste Lepilleur
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// Distributed under MIT license, or public domain if desired and
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// recognized in your jurisdiction.
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// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
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#ifndef LIB_JSONCPP_JSON_TOOL_H_INCLUDED
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#define LIB_JSONCPP_JSON_TOOL_H_INCLUDED
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/* This header provides common string manipulation support, such as UTF-8,
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* portable conversion from/to string...
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*
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* It is an internal header that must not be exposed.
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*/
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namespace Json {
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/// Converts a unicode code-point to UTF-8.
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static inline std::string codePointToUTF8(unsigned int cp) {
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std::string result;
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// based on description from http://en.wikipedia.org/wiki/UTF-8
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if (cp <= 0x7f) {
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result.resize(1);
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result[0] = static_cast<char>(cp);
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} else if (cp <= 0x7FF) {
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result.resize(2);
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result[1] = static_cast<char>(0x80 | (0x3f & cp));
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result[0] = static_cast<char>(0xC0 | (0x1f & (cp >> 6)));
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} else if (cp <= 0xFFFF) {
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result.resize(3);
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result[2] = static_cast<char>(0x80 | (0x3f & cp));
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result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
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result[0] = static_cast<char>(0xE0 | (0xf & (cp >> 12)));
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} else if (cp <= 0x10FFFF) {
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result.resize(4);
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result[3] = static_cast<char>(0x80 | (0x3f & cp));
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result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
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result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
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result[0] = static_cast<char>(0xF0 | (0x7 & (cp >> 18)));
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}
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return result;
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}
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/// Returns true if ch is a control character (in range [1,31]).
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static inline bool isControlCharacter(char ch) { return ch > 0 && ch <= 0x1F; }
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enum {
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/// Constant that specify the size of the buffer that must be passed to
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/// uintToString.
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uintToStringBufferSize = 3 * sizeof(LargestUInt) + 1
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};
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// Defines a char buffer for use with uintToString().
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typedef char UIntToStringBuffer[uintToStringBufferSize];
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/** Converts an unsigned integer to string.
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* @param value Unsigned interger to convert to string
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* @param current Input/Output string buffer.
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* Must have at least uintToStringBufferSize chars free.
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*/
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static inline void uintToString(LargestUInt value, char*& current) {
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*--current = 0;
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do {
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*--current = static_cast<signed char>(value % 10U + static_cast<unsigned>('0'));
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value /= 10;
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} while (value != 0);
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}
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/** Change ',' to '.' everywhere in buffer.
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*
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* We had a sophisticated way, but it did not work in WinCE.
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* @see https://github.com/open-source-parsers/jsoncpp/pull/9
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*/
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static inline void fixNumericLocale(char* begin, char* end) {
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while (begin < end) {
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if (*begin == ',') {
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*begin = '.';
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}
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++begin;
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}
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}
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} // namespace Json {
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#endif // LIB_JSONCPP_JSON_TOOL_H_INCLUDED
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