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json_tool.h
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1// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
2// Distributed under MIT license, or public domain if desired and
3// recognized in your jurisdiction.
4// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
5
6#ifndef LIB_JSONCPP_JSON_TOOL_H_INCLUDED
7#define LIB_JSONCPP_JSON_TOOL_H_INCLUDED
8
9#if !defined(JSON_IS_AMALGAMATION)
10#include <json/config.h>
11#endif
12
13// Also support old flag NO_LOCALE_SUPPORT
14#ifdef NO_LOCALE_SUPPORT
15#define JSONCPP_NO_LOCALE_SUPPORT
16#endif
17
18#ifndef JSONCPP_NO_LOCALE_SUPPORT
19#include <clocale>
20#endif
21
22/* This header provides common string manipulation support, such as UTF-8,
23 * portable conversion from/to string...
24 *
25 * It is an internal header that must not be exposed.
26 */
27
28 namespace Json {
29 static inline char getDecimalPoint() {
30#ifdef JSONCPP_NO_LOCALE_SUPPORT
31 return '\0';
32#else
33 struct lconv* lc = localeconv();
34 return lc ? *(lc->decimal_point) : '\0';
35#endif
36}
37
39 static inline String codePointToUTF8(unsigned int cp) {
40 String result;
41
42 // based on description from http://en.wikipedia.org/wiki/UTF-8
43
44 if (cp <= 0x7f) {
45 result.resize(1);
46 result[0] = static_cast<char>(cp);
47 } else if (cp <= 0x7FF) {
48 result.resize(2);
49 result[1] = static_cast<char>(0x80 | (0x3f & cp));
50 result[0] = static_cast<char>(0xC0 | (0x1f & (cp >> 6)));
51 } else if (cp <= 0xFFFF) {
52 result.resize(3);
53 result[2] = static_cast<char>(0x80 | (0x3f & cp));
54 result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
55 result[0] = static_cast<char>(0xE0 | (0xf & (cp >> 12)));
56 } else if (cp <= 0x10FFFF) {
57 result.resize(4);
58 result[3] = static_cast<char>(0x80 | (0x3f & cp));
59 result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
60 result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
61 result[0] = static_cast<char>(0xF0 | (0x7 & (cp >> 18)));
62 }
63
64 return result;
65}
66
67 enum {
70 uintToStringBufferSize = 3 * sizeof(LargestUInt) + 1
71};
72
73// Defines a char buffer for use with uintToString().
74 using UIntToStringBuffer = char[uintToStringBufferSize];
75
81 static inline void uintToString(LargestUInt value, char*& current) {
82 *--current = 0;
83 do {
84 *--current = static_cast<char>(value % 10U + static_cast<unsigned>('0'));
85 value /= 10;
86 } while (value != 0);
87}
88
94 template <typename Iter> Iter fixNumericLocale(Iter begin, Iter end) {
95 for (; begin != end; ++begin) {
96 if (*begin == ',') {
97 *begin = '.';
98 }
99 }
100 return begin;
101}
102
103 template <typename Iter> void fixNumericLocaleInput(Iter begin, Iter end) {
104 char decimalPoint = getDecimalPoint();
105 if (decimalPoint == '\0' || decimalPoint == '.') {
106 return;
107 }
108 for (; begin != end; ++begin) {
109 if (*begin == '.') {
110 *begin = decimalPoint;
111 }
112 }
113}
114
119 template <typename Iter>
120Iter fixZerosInTheEnd(Iter begin, Iter end, unsigned int precision) {
121 for (; begin != end; --end) {
122 if (*(end - 1) != '0') {
123 return end;
124 }
125 // Don't delete the last zero before the decimal point.
126 if (begin != (end - 1) && begin != (end - 2) && *(end - 2) == '.') {
127 if (precision) {
128 return end;
129 }
130 return end - 2;
131 }
132 }
133 return end;
134}
135
136} // namespace Json
137
138#endif // LIB_JSONCPP_JSON_TOOL_H_INCLUDED
config.h
Json
JSON (JavaScript Object Notation).
Definition allocator.h:14
Json::fixNumericLocale
Iter fixNumericLocale(Iter begin, Iter end)
Change ',' to '.
Definition json_tool.h:94
Json::codePointToUTF8
static String codePointToUTF8(unsigned int cp)
Converts a unicode code-point to UTF-8.
Definition json_tool.h:39
Json::uintToStringBufferSize
@ uintToStringBufferSize
Constant that specify the size of the buffer that must be passed to uintToString.
Definition json_tool.h:70
Json::fixZerosInTheEnd
Iter fixZerosInTheEnd(Iter begin, Iter end, unsigned int precision)
Return iterator that would be the new end of the range [begin,end), if we were to delete zeros in the...
Definition json_tool.h:120
Json::String
std::basic_string< char, std::char_traits< char >, Allocator< char > > String
Definition config.h:132
Json::UIntToStringBuffer
char[uintToStringBufferSize] UIntToStringBuffer
Definition json_tool.h:74
Json::uintToString
static void uintToString(LargestUInt value, char *&current)
Converts an unsigned integer to string.
Definition json_tool.h:81
Json::getDecimalPoint
static char getDecimalPoint()
Definition json_tool.h:29
Json::LargestUInt
UInt64 LargestUInt
Definition config.h:124
Json::fixNumericLocaleInput
void fixNumericLocaleInput(Iter begin, Iter end)
Definition json_tool.h:103