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请自行约束两种语言数据结构语法上的不同，避开如下问题： 1、json本身不约束key是否符合一个编程语言中的变量名，所以编写用于和编程语言数据结构交互的json代码时应该注意key是否正确。 2、lua没有数组，利用哈希表实现的逻辑上的数组，在中间可以存在不连续的情况时json将无法识别。 3、lua的字符串key可以和数字key共存，这对于json来说，是不允许的。
这些代码我已经用了很久了，所以暂时不多解释了，依赖c++11以上的版本， 代码挺多，有需求可以直接复制，这么多代码的目的也就是更高性能，单纯的在C++里面跑，比谷歌的实现稍微快一点点。 好了，废话不多说，上代码 #pragma once #include <string> #include <functional> #include <setjmp.h> #include <fstream> #include <vector> namespace aqx { #ifndef jsize_t typedef unsigned int jsize_t; #endif #ifndef jnumber_t typedef double jnumber_t; #endif static short constexpr jsvt_null{ 0 }; static short constexpr jsvt_string{ 1 }; static short constexpr jsvt_number{ 2 }; static short constexpr jsvt_boolean{ 3 }; static short constexpr jsvt_object{ 4 }; static short constexpr jsvt_group{ 5 }; namespace aqx_internal { #ifndef __AQX_UTF8_CHAR_LEN #define __AQX_UTF8_CHAR_LEN static unsigned char utf8_char_len[] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1 }; #endif static unsigned int json_char_state[] = { 0,0,0,0,0,0,0,0,0,32,96,0,0,96,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 32,0,640,0,0,0,0,0,0,0,0,1048576,65536,8192,131072,512, 3072,3072,3072,3072,3072,3072,3072,3072,3072,3072,16,0,0,0,0,0, 0,1024,1024,1024,1024,5120,1024,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,4,768,8,0,0, 0,17408,1024,1024,1024,21504,50176,0,0,0,0,0,278528,0,524800,0, 0,0,16896,16384,49664,279040,0,0,0,0,0,1,0,2,0,0 }; static int u16c2u8c(unsigned long u16c, unsigned char *u8c) { if (u16c <= 0x0000007F) { u8c[0] = u16c & 0x7F; return 1; } else if (u16c >= 0x00000080 && u16c <= 0x000007FF) { u8c[1] = (u16c & 0x3F) | 0x80; u8c[0] = ((u16c >> 6) & 0x1F) | 0xC0; return 2; } else if (u16c >= 0x00000800 && u16c <= 0x0000FFFF) { u8c[2] = (u16c & 0x3F) | 0x80; u8c[1] = ((u16c >> 6) & 0x3F) | 0x80; u8c[0] = ((u16c >> 12) & 0x0F) | 0xE0; return 3; } else if (u16c >= 0x00010000 && u16c <= 0x001FFFFF) { u8c[3] = (u16c & 0x3F) | 0x80; u8c[2] = ((u16c >> 6) & 0x3F) | 0x80; u8c[1] = ((u16c >> 12) & 0x3F) | 0x80; u8c[0] = ((u16c >> 18) & 0x07) | 0xF0; return 4; } else if (u16c >= 0x00200000 && u16c <= 0x03FFFFFF) { u8c[4] = (u16c & 0x3F) | 0x80; u8c[3] = ((u16c >> 6) & 0x3F) | 0x80; u8c[2] = ((u16c >> 12) & 0x3F) | 0x80; u8c[1] = ((u16c >> 18) & 0x3F) | 0x80; u8c[0] = ((u16c >> 24) & 0x03) | 0xF8; return 5; } else if (u16c >= 0x04000000 && u16c <= 0x7FFFFFFF) { u8c[5] = (u16c & 0x3F) | 0x80; u8c[4] = ((u16c >> 6) & 0x3F) | 0x80; u8c[3] = ((u16c >> 12) & 0x3F) | 0x80; u8c[2] = ((u16c >> 18) & 0x3F) | 0x80; u8c[1] = ((u16c >> 24) & 0x3F) | 0x80; u8c[0] = ((u16c >> 30) & 0x01) | 0xFC; return 6; } return 0; } namespace JSON_SYNTAX { static constexpr auto _T_OBJECT_BEGIN{ static_cast<unsigned int>(0x01) }; // { static constexpr auto _T_OBJECT_END{ static_cast<unsigned int>(0x02) }; // } static constexpr auto _T_GROUP_BEGIN{ static_cast<unsigned int>(0x04) }; // [ static constexpr auto _T_GROUP_END{ static_cast<unsigned int>(0x08) }; // ] static constexpr auto _T_VALUE{ static_cast<unsigned int>(0x10) }; // : static constexpr auto _T_SPACE{ static_cast<unsigned int>(0x20) }; // 4个空白字符" \t\r\n" static constexpr auto _T_ENDL{ static_cast<unsigned int>(0x40) }; // 2个换行符"\r\n" static constexpr auto _T_TEXT{ static_cast<unsigned int>(0x80) }; // " static constexpr auto _T_ESCAPE_BEGIN{ static_cast<unsigned int>(0x100) }; // 转义符开始 '\\' static constexpr auto _T_ESCAPE_TYPE{ static_cast<unsigned int>(0x200) }; // 转义符类型 "nrtbfu\\" static constexpr auto _T_HEX{ static_cast<unsigned int>(0x400) }; // \u之后UTF16的4字符HEX，"abcdefABCDEF" static constexpr auto _T_NUMBER{ static_cast<unsigned int>(0x800) }; // 数字"0-9" static constexpr auto _T_E{ static_cast<unsigned int>(0x1000) }; // 科学计数法 e或E static constexpr auto _T_NEGATIVE{ static_cast<unsigned int>(0x2000) }; // 负数 - static constexpr auto _T_BOOL{ static_cast<unsigned int>(0x4000) }; // true false static constexpr auto _T_BOOL_BEGIN{ static_cast<unsigned int>(0x8000) }; // t f static constexpr auto _T_NEXT{ static_cast<unsigned int>(0x10000) }; // , static constexpr auto _T_DECIMAL{ static_cast<unsigned int>(0x20000) }; // 小数点 . static constexpr auto _T_NULL{ static_cast<unsigned int>(0x40000) }; // null static constexpr auto _T_NULL_BEGIN{ static_cast<unsigned int>(0x80000) }; // n static constexpr auto _T_POSITIVE{ static_cast<unsigned int>(0x100000) }; // + } static constexpr auto _jnf{ static_cast<jsize_t>(-1) }; template<typename _Ty> class _json_parser; class _jts_base { public: _jts_base() { text = nullptr; } void init(const char *_Text, int _Size) { text = _Text; size = _Size; instr = false; flags = 0; index = 0; } jsize_t open_instr() { instr = true; jsize_t _Result = flags; flags = 0; return _Result; } void close_instr(jsize_t _Flags) { instr = false; flags = _Flags; } jsize_t set_flags(jsize_t _Flags) { auto _Result = flags; flags = _Flags; return _Result; } long subhextol(int left, int len) { long _Result = 0; int rlen = len; for (int i = 0; i < len; i++) { char c = text[--rlen]; long _Tmp; switch (c) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': _Tmp = c - '0'; break; case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': _Tmp = c - 'a' + 10; break; case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': _Tmp = c - 'A' + 10; break; default: return 0; } _Result += (_Tmp << (i << 2)); } return _Result; } protected: const char *text; jsize_t size; unsigned int s; char c; unsigned char cl; bool instr; unsigned int flags; jsize_t index; std::string tmp; }; class _jts_utf8 : public _jts_base { public: int operator++() { c = text[index]; cl = utf8_char_len[(unsigned char)c]; if (cl != 1) { if (flags == JSON_SYNTAX::_T_ESCAPE_TYPE || !instr) return -1; do { index += cl; c = text[index]; cl = utf8_char_len[(unsigned char)c]; } while (cl != 1); } s = json_char_state[c]; if (flags & s) { index += cl; return 0; } if (instr) { if (s & JSON_SYNTAX::_T_ENDL) return -1; index += cl; return 0; } return -1; } private: friend class _json_parser<_jts_utf8>; }; class _jts_gbk : public _jts_base { public: int operator++() { c = text[index]; cl = ((unsigned char)c & 0x80) ? 2 : 1; if (cl != 1) { if (flags == JSON_SYNTAX::_T_ESCAPE_TYPE || !instr) return -1; do { index += cl; c = text[index]; cl = ((unsigned char)c & 0x80) ? 2 : 1; } while (cl != 1); } s = json_char_state[c]; if (flags & s) { index += cl; return 0; } if (instr) { if (s & JSON_SYNTAX::_T_ENDL) return -1; index += cl; return 0; } return -1; } private: friend class _json_parser<_jts_gbk>; }; class _json_tree { public: class node { public: node() { _Size = 0; _Bgn = _Parent = _jnf; } node(jsize_t _Pa) { _Size = 0; _Parent = _Pa; _Bgn = _jnf; } jsize_t size() { return _Size; } jsize_t begin() { return _Bgn; } private: friend class _json_parser<_jts_utf8>; friend class _json_parser<_jts_gbk>; friend class _json_tree; jsize_t _Size, _Bgn, _End, _Parent; }; class var { public: var() { Key = _jnf; Next = _jnf; Kty = 1; Type = 0; } var(short _KTy, jsize_t _Key) { Next = _jnf; Kty = _KTy; Key = _Key; Type = 0; } var(short _KTy, jsize_t _Key, short |
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