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今天小編給大家分享一下怎么用C++編寫一個Json解析器的相關知識點，內容詳細，邏輯清晰，相信大部分人都還太了解這方面的知識，所以分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后有所收獲，下面我們一起來了解一下吧。
之前用RapidJson來做json的解析，但是，RapidJson還是有麻煩的地方，雖然速度非常快，但是由于用了非常多的優化技巧，反而無法做到我想要的那種簡便的訪問方式。
比如，有這么一個字符串：
"{ \"a\":1000,\"b\":30000,\"c\":[123,456,789,5555, 1.0e2, true, false, null, \"test\", \"big big world\"]}"我在C++里面需要非常簡單的使用它，例如這樣：
static char text[] = "{ \"a\":1000,\"b\":30000,\"c\":[123,456,789,5555, 1.0e2, true, false, null, \"test\", \"big big world\"]}";
atom::CJson root = text;
root["a"] = 123;
root["c"] = true;
root["b"] = "b is the biggest";
atom::CJson test = "{\"new key\": 1037, 'test-key':1234e-5, 'array':[1,2,3,1,1,0] }";
root["e"] = test;
test["array"][0] = 1000;
atom::a_string value = root.Stringity();
printf( "%s\n", value.c_str() );而輸出結果如下：
{"a":123, "b":"b is the biggest", "c":1, "e":{"new key":1037, "test-key":0.012340, "array":[1000, 2, 3, 1, 1, 0, ], }, }
找了幾個Json庫，似乎都沒有我想要的那種效果。快的訪問很麻煩，訪問方便點的速度又上不去。后來還是決定自己寫一個。
自己寫出來后，測試了一下，在不開優化的情況下，時間開銷大概是RapidJson的8倍，如果開編譯器優化，則時間開銷是RapidJson的4倍左右。其實還是有可以再優化的地方，但再優化就必須要損失易用性為代價。想了一下，還是放棄了，這個解析速度和訪問的方便程度我已經很滿意了。
而且我自己寫的Json還能支持序列化到流數據，如果采用這個方式，恢復的速度和RapidJson的解析差不多。
tokenizer數據結構的頭文件和cpp文件
#ifndef TAGJSONTOKEN_H
#define TAGJSONTOKEN_H
//Begin section for file tagJsonToken.h
//TODO: Add definitions that you want preserved
//End section for file tagJsonToken.h
#include "../stl/a_string.h"
#include "../stl/allocator.h"
#include "../tool/CVariablePtr.h"
namespace atom
{
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
struct tagJsonToken
{
//Begin section for atom::tagJsonToken
//TODO: Add attributes that you want preserved
//End section for atom::tagJsonToken
public:
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
//typedef CVariablePtr<tagJsonToken> Ptr ;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
typedef vector<tagJsonToken, atom_allocator<tagJsonToken> > Array ;
public:
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
U32 token;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
size_t start;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
size_t close;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonToken();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonToken(const tagJsonToken & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonToken(U32 token);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonToken(U32 token, size_t start, size_t close);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
~tagJsonToken();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonToken & operator=(const tagJsonToken & value);
}; //end struct tagJsonToken
} //end namespace nova
#endif#include "tagJsonToken.h"
//Begin section for file tagJsonToken.cpp
//TODO: Add definitions that you want preserved
//End section for file tagJsonToken.cpp
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken::tagJsonToken() :
token(0),start(0),close(0)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken::tagJsonToken(const tagJsonToken & in) :
token(in.token),start(in.start),close(in.close)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken::tagJsonToken(U32 t) :
token(t),start(0),close(0)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken::tagJsonToken(U32 t, size_t s, size_t c) :
token(t),start(s),close(c)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken::~tagJsonToken()
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken & atom::tagJsonToken::operator=(const tagJsonToken & in)
{
//TODO Auto-generated method stub
token = in.token;
start = in.start;
close = in.close;
return( * this );
}json節點的頭文件和cpp文件
#ifndef TAGJSONKEYVALUE_H
#define TAGJSONKEYVALUE_H
//Begin section for file tagJsonKeyValue.h
//TODO: Add definitions that you want preserved
//End section for file tagJsonKeyValue.h
#include "../stl/a_string.h"
#include "../stl/stl_extend.h"
#include "../variant/CVariant.h"
#include "../tool/CVariablePtr.h"
namespace atom
{
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
struct tagJsonKeyValue
{
//Begin section for atom::tagJsonKeyValue
//TODO: Add attributes that you want preserved
//End section for atom::tagJsonKeyValue
public:
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
typedef CVariablePtr<tagJsonKeyValue> Ptr ;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
typedef vector<pair<size_t, tagJsonKeyValue::Ptr>, atom_allocator<pair<size_t, tagJsonKeyValue::Ptr> > > Array ;
public:
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
a_string index;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CVariant value;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
Array group;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
//Map query;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue(const char * value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue(const CVariant & data);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue(const char * value, const CVariant & data);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue(const tagJsonKeyValue & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
~tagJsonKeyValue();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue & operator=(const tagJsonKeyValue & value);
}; //end struct tagJsonKeyValue
} //end namespace atom
template<class Archive>
inline void Serialize(Archive & archive, atom::tagJsonKeyValue & value, bool isSave)
{
UNREFERENCED_PARAMETER( isSave );
archive.Bind( value.index );
archive.Bind( value.value );
archive.Bind( value.group );
}
#endif#include "tagJsonKeyValue.h"
//Begin section for file tagJsonKeyValue.cpp
//TODO: Add definitions that you want preserved
//End section for file tagJsonKeyValue.cpp
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue::tagJsonKeyValue()
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue::tagJsonKeyValue(const char * in):
index(in ? in : "")
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue::tagJsonKeyValue(const CVariant & in) :
value(in)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue::tagJsonKeyValue(const char * in_1, const CVariant & in_2) :
index(in_1 ? in_1 : ""),value(in_2)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue::tagJsonKeyValue(const tagJsonKeyValue & in) :
index(in.index),value(in.value),group(in.group)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue::~tagJsonKeyValue()
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue & atom::tagJsonKeyValue::operator=(const tagJsonKeyValue & in)
{
//TODO Auto-generated method stub
index = in.index;
value = in.value;
group = in.group;
return( * this );
}接下來是 Tokenizer 的實現
#include "CJsonTokenizer.h"
#include "../../enumeration/JSON_TOKEN.h"
//Begin section for file CJsonTokenizer.cpp
//TODO: Add definitions that you want preserved
//End section for file CJsonTokenizer.cpp
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJsonTokenizer::CJsonTokenizer()
{
//TODO Auto-generated method stub
tokens.reserve( 1024 );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJsonTokenizer::~CJsonTokenizer()
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::Start(const char * json)
{
//TODO Auto-generated method stub
if( json == NULL ) {
return false;
}
size_t offset = 0;
size_t length = strlen( json );
buffer.Alloc( length );
if( buffer ) {
buffer.Store( json, length );
}
bool result = true;
for( ;; )
{
// skip any reserved or space characters.
for( ; IsSpace(json, offset, length); ++ offset );
// offset check
if( offset >= length )
{
tokens.push_back( tagJsonToken() );
tokens.back().token = JT_END;
break;
}
char c = json[offset];
// create token
if( IsNull(json, offset, length) )
{
offset += 4;
tokens.push_back( tagJsonToken(JT_NULL) );
}
else
if( c == ',' )
{
offset += 1;
tokens.push_back( tagJsonToken(JT_COMMA) );
}
else
if( c == ':' )
{
offset += 1;
tokens.push_back( tagJsonToken(JT_COLON) );
}
else
if( c == '{' )
{
offset += 1;
tokens.push_back( tagJsonToken(JT_OBJECT_BEGIN) );
}
else
if( c == '[' )
{
offset += 1;
tokens.push_back( tagJsonToken(JT_ARRAY_BEGIN) );
}
else
if( c == ']' )
{
offset += 1;
tokens.push_back( tagJsonToken(JT_ARRAY_CLOSE) );
}
else
if( c == '}' )
{
offset += 1;
tokens.push_back( tagJsonToken(JT_OBJECT_CLOSE) );
}
else
if( IsTrue(json, offset, length) )
{
offset += 4;
tokens.push_back( tagJsonToken(JT_BOOL, 1, 0) );
}
else
if( IsFalse(json, offset, length) )
{
offset += 5;
tokens.push_back( tagJsonToken(JT_BOOL) );
}
else
if( c == '\'' || c == '\"' )
{
// read string will modify the offset;
size_t start(0), close(0);
ReadString( json, offset, length, start, close );
if( start == 0 || close == 0 || close <= start )
{
char msg[32];
sprintf( msg, "%zu", offset );
errmsg = "Failed read string from offset ";
errmsg = errmsg + msg;
tokens.clear();
result = false;
break;
}
tokens.push_back( tagJsonToken(JT_STRING, start, close) );
}
else
if( IsNumber(json, offset, length) )
{
size_t start(0), close(0);
ReadNumber( json, offset, length, start, close );
// read number will modify the offset;
if( start == 0 || close == 0 || close <= start )
{
char msg[32];
sprintf( msg, "%zu", offset );
errmsg = "Failed read number from offset ";
errmsg = errmsg + msg;
tokens.clear();
result = false;
break;
}
tokens.push_back( tagJsonToken(JT_NUMBER, start, close) );
}
else
{
char msg[32];
sprintf( msg, "%zu", offset );
errmsg = "Invalid char at offset ";
errmsg = errmsg + msg;
tokens.clear();
result = false;
break;
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::IsNull(const char * json, size_t & offset, size_t length)
{
//TODO Auto-generated method stub
bool result = false;
if( json )
{
// length must enough.
if( (length - offset) + 1 >= 4 )
{
const char * site = json + offset;
if( *site == 'n' || *site == 'N' )
{
++ site;
if( *site == 'u' || *site == 'U' )
{
++ site;
if( *site == 'l' || *site == 'L' )
{
++ site;
if( *site == 'l' || *site == 'L' )
{
result = true;
}
}
}
}
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::IsTrue(const char * json, size_t & offset, size_t length)
{
//TODO Auto-generated method stub
bool result = false;
if( json )
{
// length must enough.
if( (length - offset) + 1 >= 4 )
{
const char * site = json + offset;
if( *site == 't' || *site == 'T' )
{
++ site;
if( *site == 'r' || *site == 'R' )
{
++ site;
if( *site == 'u' || *site == 'U' )
{
++ site;
if( *site == 'e' || *site == 'E' )
{
result = true;
}
}
}
}
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::IsFalse(const char * json, size_t & offset, size_t length)
{
//TODO Auto-generated method stub
bool result = false;
if( json )
{
// length must enough.
if( (length - offset) + 1 >= 5 )
{
const char * site = json + offset;
if( *site == 'f' || *site == 'F' )
{
++ site;
if( *site == 'a' || *site == 'A' )
{
++ site;
if( *site == 'l' || *site == 'L' )
{
++ site;
if( *site == 's' || *site == 'S' )
{
++ site;
if( *site == 'e' || *site == 'E' )
{
result = true;
}
}
}
}
}
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::IsSpace(const char * json, size_t & offset, size_t length)
{
//TODO Auto-generated method stub
if( !json ) {
return false;
}
bool result = false;
if( offset < length )
{
if( json[offset] <= 0x20 )
{
result = true;
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::IsNumber(const char * json, size_t & offset, size_t length)
{
//TODO Auto-generated method stub
if( !json ) {
return false;
}
bool result = false;
if( offset < length )
{
char c = json[offset];
result = IsDigit( c ) || c == '-';
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::IsEscape(const char * json, size_t & offset, size_t length)
{
//TODO Auto-generated method stub
if( !json ) {
return false;
}
bool result = false;
if( offset < length )
{
char c = json[offset];
if( c == '\"' || c == '\\' || c == '/' ||
c == 'b' || c == 'f' || c == 'n' ||
c == 't' || c == 'r' || c == 'u' )
{
result = true;
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::ReadNumber(const char * json, size_t & offset, size_t length, size_t & start, size_t & close)
{
//TODO Auto-generated method stub
if( !json ) {
return false;
}
if( offset >= length ) {
return false;
}
size_t backup = offset;
start = offset;
close = offset;
if( json[offset] == '-' )
{
++ close; ++ offset;
}
char c = 0;
bool succeed = true;
// read integer part
size_t bias(0); bool stop(false);
for( ;; ++ bias )
{
if( offset == length ) {
break;
}
if( offset > length ) {
succeed = false;
break;
}
c = json[offset];
// stop flag
if( stop == true ) {
break;
}
// if 0 is the first digit.
if( bias == 0 && c == '0' )
{
++ close; ++ offset;
stop = true;
continue;
}
if( IsDigit(c) )
{
++ close; ++ offset;
continue;
}
// The first char is illegal, set failed.
if( bias == 0 ) {
succeed = false;
}
// if c is not digit, break;
break;
}
if( succeed &&
offset == length ) {
return true;
}
// read frac part
if( succeed && c == '.' )
{
++ close; ++ offset;
bias = 0;
for( ;; ++ bias )
{
if( offset == length ) {
break;
}
if( offset > length ) {
succeed = false;
break;
}
c = json[offset];
if( IsDigit(c) )
{
++ close; ++ offset;
continue;
}
if( bias == 0 ) {
succeed = false;
}
// if c is not digit, break;
break;
}
}
if( succeed &&
offset == length ) {
return true;
}
// read exp part
if( succeed && (
c == 'e' || c == 'E' ) )
{
++ close; ++ offset;
bias = 0;
for( ;; ++ bias )
{
if( offset == length ) {
break;
}
if( offset > length ) {
succeed = false;
break;
}
c = json[offset];
if( c == '-' )
{
if( bias == 0 )
{
++ close; ++ offset;
continue;
}
else
{
succeed = false;
break;
}
}
if( IsDigit(c) )
{
++ close; ++ offset;
continue;
}
if( bias == 0 ) {
succeed = false;
}
// if c is not digit, break;
break;
}
}
if( succeed == false ) {
offset = backup; start = close = 0;
}
return succeed;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonTokenizer::ReadString(const char * json, size_t & offset, size_t length, size_t & start, size_t & close)
{
//TODO Auto-generated method stub
if( !json ) {
return false;
}
if( offset >= length ) {
return false;
}
size_t backup = offset;
char quotation = 0;
if (json[offset] == '\"' || json[offset] == '\'') {
quotation = json[offset ++];
}
start = close = offset;
char c;
bool succeed = true;
for( ;; )
{
// check the offset.
if( offset >= length )
{
succeed = false;
break;
}
c = json[offset ++];
// is escpae ?
if( c == '\\' )
{
if( !IsEscape(json, offset, length) )
{
succeed = false;
break;
}
++ close;
// because the IsEscape function already verified the
// offset range. so, here's offset is valid.
c = json[offset ++];
++ close;
// Process Unicode，from \u0000 to \uffff
if( c == 'u' )
{
// memory border check
if( length - offset + 1 < 4 ) {
succeed = false;
break;
}
for( size_t i = 0; i < 4; ++ i )
{
c = json[offset ++];
if( IsHex(c) )
{
++ close;
}
else
{
succeed = false;
break;
}
}
// if failed to process Unicode, stop the main loop.
if( !succeed ) break;
}
}
// another quotation ?
else
if( c == quotation )
{
break;
}
else
if( c == '\r' || c == '\n')
{
succeed = false;
break;
}
else
{
++ close;
}
}
// 如果失敗，則清理現場
if( succeed == false ) {
offset = backup; start = close = 0;
}
return succeed;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonToken::Array & atom::CJsonTokenizer::GetTokens()
{
//TODO Auto-generated method stub
return tokens;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::a_string atom::CJsonTokenizer::GetError()
{
//TODO Auto-generated method stub
return errmsg;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
const char * atom::CJsonTokenizer::GetString(size_t start, size_t close)
{
//TODO Auto-generated method stub
static char text[] = "";
size_t length = buffer.GetLength();
if( start < length && close < length && close > start )
{
buffer.Query<char>()[close] = 0;
return & buffer.Query<char>()[start];
}
return text;
}Parser的實現：
#include "CJsonParser.h"
#include "CJsonTokenizer.h"
#include "../stl/string_splite.h"
#include "../../enumeration/JSON_TOKEN.h"
//Begin section for file CJsonParser.cpp
//TODO: Add definitions that you want preserved
//End section for file CJsonParser.cpp
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJsonParser::CJsonParser()
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJsonParser::~CJsonParser()
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonParser::Parse(const char * text, CJson & json)
{
//TODO Auto-generated method stub
if( text == NULL ) {
error = "Invalid arguments";
return false;
}
bool result = false;
CJsonTokenizer tokenizer;
if( tokenizer.Start(text) == false ) {
error = tokenizer.GetError();
return false;
}
if( tokenizer.GetTokens().empty() ) {
error = "Empty json string";
return false;
}
size_t offset = 0;
U32 begin_token = tokenizer.GetTokens().front().token;
if( begin_token == JT_ARRAY_BEGIN )
{
result = ParseArray ( tokenizer, offset, json );
}
else
if( begin_token == JT_OBJECT_BEGIN )
{
result = ParseObject ( tokenizer, offset, json );
}
else
if( IsPrimary(begin_token) )
{
CVariant data;
result = ParsePrimary( tokenizer, offset, data );
if( result )
{
// 一開始就是原型的字符串必須立即結束
if( tokenizer.GetTokens().size() <= offset ||
tokenizer.GetTokens().at(offset).token == JT_END )
{
json = data;
}
else
{
error = "Json should ended after the 1st element";
result = false;
}
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::a_string atom::CJsonParser::GetError()
{
//TODO Auto-generated method stub
return error;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonParser::IsPrimary(U32 type)
{
//TODO Auto-generated method stub
return
type == JT_BOOL || type == JT_NULL ||
type == JT_NUMBER || type == JT_STRING;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonParser::ParseArray(CJsonTokenizer & tokenizer, size_t & offset, CJson & node)
{
//TODO Auto-generated method stub
tagJsonToken::Array & tokens = tokenizer.GetTokens();
if( offset >= tokens.size() ) {
error = "Invalid offset";
return false;
}
if( tokens[offset].token != JT_ARRAY_BEGIN ) {
error = "Invalid array token";
return false;
}
size_t backup = offset;
// consume [
++ offset;
bool result = true;
for( ;; )
{
if( offset >= tokens.size() )
{
error = "Tokens not complete";
result = false;
break;
}
if( tokens[offset].token == JT_ARRAY_CLOSE )
{
++ offset; // consume ]
break;
}
if( tokens[offset].token == JT_ARRAY_BEGIN )
{
CJson data;
if( false ==
ParseArray(tokenizer, offset, data) )
{
result = false;
break;
}
node.Push( data );
}
else
if( tokens[offset].token == JT_OBJECT_BEGIN )
{
CJson data;
if( false ==
ParseObject(tokenizer, offset, data) )
{
result = false;
break;
}
node.Push( data );
}
else
if( tokens[offset].token == JT_COMMA )
{
++ offset;
}
else
if( IsPrimary(tokens[offset].token) )
{
CVariant data;
if( false ==
ParsePrimary(tokenizer, offset, data) )
{
result = false;
break;
}
node.Push( data );
}
else
{
error = "Invalid token in array";
result = false;
break;
}
}
if( result == false ) {
offset = backup;
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonParser::ParseObject(CJsonTokenizer & tokenizer, size_t & offset, CJson & node)
{
//TODO Auto-generated method stub
tagJsonToken::Array & tokens = tokenizer.GetTokens();
if( offset >= tokens.size() ) {
error = "Invalid offset";
return false;
}
if( tokens[offset].token != JT_OBJECT_BEGIN )
{
error = "Invalid object token";
return false;
}
size_t backup = offset;
// consume {
++ offset;
bool result = true;
for( ;; )
{
if( offset >= tokens.size() )
{
error = "Tokens not complete";
result = false;
break;
}
if( tokens[offset].token == JT_OBJECT_CLOSE )
{
++ offset; // consume }
break;
}
if( tokens[offset].token == JT_COMMA )
{
++ offset; // consume ,
continue;
}
// 讀key，key必須是string類型
if( tokens[offset].token != JT_STRING )
{
error = "Invalid key token type";
result = false;
break;
}
// 創建對象的鍵值對。
CJson value = node[
tokenizer.GetString(
tokens[offset].start,
tokens[offset].close)];
++ offset;
if( offset >= tokens.size() )
{
error = "Tokens not complete";
result = false;
break;
}
if( tokens[offset].token != JT_COLON )
{
error = "Invalid splite token type";
result = false;
break;
}
++ offset; // consume :
if( offset >= tokens.size() )
{
error = "Tokens not complete";
result = false;
break;
}
if( IsPrimary(tokens[offset].token) )
{
CVariant data;
if( false ==
ParsePrimary(tokenizer, offset, data) )
{
result = false;
break;
}
value = data;
}
else
if( tokens[offset].token == JT_ARRAY_BEGIN )
{
CJson data;
if( false ==
ParseArray(tokenizer, offset, data) )
{
result = false;
break;
}
value = data;
}
else
if( tokens[offset].token == JT_OBJECT_BEGIN )
{
CJson data;
if( false ==
ParseObject(tokenizer, offset, data) )
{
result = false;
break;
}
value = data;
}
else
{
error = "Invalid value token type";
result = false;
break;
}
}
if( result == false ) {
offset = backup;
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJsonParser::ParsePrimary(CJsonTokenizer & tokenizer, size_t & offset, CVariant & data)
{
//TODO Auto-generated method stub
tagJsonToken::Array & tokens = tokenizer.GetTokens();
if( offset >= tokens.size() ) {
error = "Invalid offset";
return false;
}
bool result = true;
switch( tokens[offset].token )
{
case JT_NUMBER:
{
const char * value = tokenizer.GetString(
tokens[offset].start,
tokens[offset].close );
size_t length = strlen( value );
size_t splite = 0;
for( size_t i = 0; i < length; ++ i )
{
if( value[i] == 'e' || value[i] == 'E' ) {
splite = i;
}
}
// only one part.
if( length > 0 )
{
// 先計算指數
char * stop = NULL;
I64 exp = 0;
if( splite != 0 )
{
#if defined(_WIN32)
exp = static_cast<I64>( _strtoi64( & value[splite + 1], & stop, 10 ) );
#else
exp = static_cast<I64>( strtoll ( & value[splite + 1], & stop, 10 ) );
#endif
}
if( splite == 0 )
{
splite = length;
}
bool is_float = false;
for( size_t i = 0; i < splite; ++ i )
{
if( value[i] == '.' ) {
is_float = true;
}
}
// 再判斷前面部分
if( is_float == false )
{
#if defined(_WIN32)
I64 integer = static_cast<I64>( _strtoi64( value, & stop, 10 ) );
#else
I64 integer = static_cast<I64>( strtoll ( value, & stop, 10 ) );
#endif
double range = integer * pow( 10, exp );
abs( range - static_cast<I64>(range) ) < 1e-6 ?
data = static_cast<I64>(range):
data = range;
++ offset;
}
else
{
double decimal = strtod( value, & stop );
double range = decimal * pow( 10, exp );
abs( range - static_cast<I64>(range) ) < 1e-6 ?
data = static_cast<I64>(range):
data = range;
++ offset;
}
}
else
{
error = "Invalid number format";
result = false;
}
}
break;
case JT_STRING:
{
data = tokenizer.GetString(
tokens[offset].start,
tokens[offset].close );
++ offset;
}
break;
case JT_NULL:
{
data.Clear(); ++ offset;
}
break;
case JT_BOOL:
{
bool value = tokens[offset ++].start == 1;
data = value;
}
break;
default:
error = "Not primary"; result = false;
break;
}
return result;
}最后的重點：CJson 類的實現：
#ifndef CJSON_H
#define CJSON_H
//Begin section for file CJson.h
//TODO: Add definitions that you want preserved
//End section for file CJson.h
#include "tagJsonKeyValue.h"
#include "../variant/CVariant.h"
namespace atom
{
//<p>This class is not thread safe. Should used under critical section's protection.</p>
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
class CJson
{
//Begin section for atom::CJson
//TODO: Add attributes that you want preserved
//End section for atom::CJson
private:
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
mutable tagJsonKeyValue::Ptr root;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
mutable U08 type;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
U08 CheckType(const tagJsonKeyValue::Ptr & node);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool Assign(U08 in_type, const tagJsonKeyValue::Ptr & in, bool & deep);
public:
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson(const CJson & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson(const tagJsonKeyValue::Ptr & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson(const char * value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
operator CVariant() const;
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson & operator=(const CJson & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson & operator=(const CVariant & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson & operator=(const tagJsonKeyValue::Ptr & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson & operator=(const char * value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson operator[](I32 offset);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson operator[](size_t offset);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson operator[](const char * index);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
size_t Length();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
U08 GetType();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool Push(const CVariant & data);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool Push(const CJson & data);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
a_string Stringity();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
a_string Stringity(const tagJsonKeyValue::Ptr & value);
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson Clone();
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
tagJsonKeyValue Clone(const tagJsonKeyValue::Ptr & value);
template<class A>
inline void Serialize(A & ar, bool save)
{
ar.Bind( type );
ar.Bind( root );
}
}; //end class CJson
} //end namespace atom
#endif#include "CJson.h"
#include "CJsonParser.h"
#include "../stl/stl_extend.h"
#include "../../enumeration/JSON_VALUE_TYPE.h"
#include "../../enumeration/VARIANT_TYPE.h"
//Begin section for file CJson.cpp
//TODO: Add definitions that you want preserved
//End section for file CJson.cpp
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson::CJson() :
type(JVT_NONE)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson::CJson(const CJson & value) :
root(value.root),type(value.type)
{
//TODO Auto-generated method stub
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson::CJson(const tagJsonKeyValue::Ptr & value) :
type(JVT_NONE)
{
//TODO Auto-generated method stub
* this = value;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson::CJson(const char * value) :
type(JVT_NONE)
{
//TODO Auto-generated method stub
* this = value;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJson::Assign(U08 in_type, const tagJsonKeyValue::Ptr & in, bool & deep)
{
//TODO Auto-generated method stub
if( root == NULL ) {
root = tagJsonKeyValue();
}
if( root == NULL ) {
return false;
}
// 對不同的類型有不同的設置方式；
// 此處是深度復制，是否需要淺層復制？
deep = true;
switch( type )
{
case JVT_OBJECT:
case JVT_ARRAY:
root -> group.clear();
case JVT_NONE:
case JVT_PRIMARY:
root -> value.Clear();
root -> index = in -> index;
root -> value = in -> value;
root -> group = in -> group;
type = in_type;
break;
case JVT_PAIR:
switch( in_type )
{
case JVT_NONE:
case JVT_PRIMARY:
root -> value.Clear();
if( in ) {
root -> value = in -> value;
type = JVT_PRIMARY;
}
break;
case JVT_OBJECT:
type = JVT_OBJECT;
root -> group.clear();
if( in ) {
root -> group = in -> group;
}
break;
case JVT_ARRAY:
type = JVT_ARRAY;
root -> group.clear();
if( in ) {
root -> group = in -> group;
}
break;
case JVT_PAIR:
type = JVT_OBJECT;
root -> value.Clear();
root -> group.clear();
if( in )
{
atom_hash<const char *> hasher;
root -> group.push_back( make_pair(
hasher( in -> index.c_str() ), in) );
// 唯有插入pair變成object時，才是淺層復制
deep = false;
}
}
break;
}
return true;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson & atom::CJson::operator=(const CJson & in)
{
//TODO Auto-generated method stub
bool deep = false;
if( Assign(in.type, in.root, deep) )
{
if( deep )
{
in.root -> index = root -> index;
in.root -> value = root -> value;
in.root -> group = root -> group;
in.type = type;
}
}
return( * this );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson & atom::CJson::operator=(const tagJsonKeyValue::Ptr & in)
{
//TODO Auto-generated method stub
// 該函數直接賦值，因為這個函數僅僅是在Parse時調用
root = in;
type = CheckType( in );
return( * this );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson & atom::CJson::operator=(const CVariant & value)
{
//TODO Auto-generated method stub
// 如果為空，則賦予初值
if( root == NULL ) {
root = tagJsonKeyValue();
}
if( root == NULL ) {
return( * this );
}
// 對不同的類型有不同的設置方式；
switch( type )
{
case JVT_OBJECT:
case JVT_ARRAY:
root -> group.clear();
case JVT_NONE:
case JVT_PRIMARY:
root -> value = value;
type = JVT_PRIMARY;
break;
case JVT_PAIR:
root -> value = value;
break;
}
return( * this );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson & atom::CJson::operator=(const char * value)
{
//TODO Auto-generated method stub
if( value )
{
CJsonParser parser; CJson node;
if( parser.Parse(value, node) ) {
* this = node;
} else {
* this = CVariant( value );
}
}
return( * this );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson atom::CJson::operator[](I32 offset)
{
//TODO Auto-generated method stub
return this -> operator[]( static_cast<size_t>(offset) );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson atom::CJson::operator[](size_t offset)
{
//TODO Auto-generated method stub
if( root && type == JVT_ARRAY )
{
if( offset < root -> group.size() )
{
return CJson( root -> group[offset].second );
}
}
return CJson();
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson atom::CJson::operator[](const char * index)
{
//TODO Auto-generated method stub
// 訪問類成員，本身不能是數組，也就是說root的大小必須為1
// 然后這個index必須存在。
if( !index ) {
return CJson();
}
// 如果為空，則初始化一個
if( root == NULL ) {
root = tagJsonKeyValue();
root -> group.reserve( 32 );
}
if( root == NULL ) {
return CJson();
}
// 任何類型，都強制轉換為object，然后重新設置
switch( type )
{
case JVT_ARRAY:
root -> group.clear();
case JVT_PAIR:
root -> index.clear();
case JVT_PRIMARY:
root -> value.Clear();
case JVT_NONE:
type = JVT_OBJECT;
break;
case JVT_OBJECT:
break;
}
atom_hash<const char *> hasher;
size_t key = hasher( index );
bool finded = false;
for( tagJsonKeyValue::Array::iterator
it = root -> group.begin();
it != root -> group.end(); ++ it )
{
if( it -> first != key ) {
continue;
}
// 必須判斷 it second 內是否有值
if( it -> second != NULL )
{
finded = true;
return CJson( it -> second );
}
}
if( finded == false )
{
root -> group.push_back(
make_pair( key, tagJsonKeyValue(index) ) );
// return directly
return CJson( root -> group.back().second );
}
return CJson();
}
namespace atom
{
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
CJson::operator CVariant() const
{
//TODO Auto-generated method stub
if( root &&
type == JVT_PRIMARY ||
type == JVT_PAIR )
{
return CVariant( root -> value );
}
return CVariant();
}
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
U08 atom::CJson::CheckType(const tagJsonKeyValue::Ptr & node)
{
//TODO Auto-generated method stub
U08 result = JVT_NONE;
if( node )
{
if( node -> group.empty() == false )
{
node -> group.front().first == 0 ?
result = JVT_ARRAY :
result = JVT_OBJECT;
}
else
if( node -> index.empty() == false )
{
result = JVT_PAIR;
}
else
{
result = JVT_PRIMARY;
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
size_t atom::CJson::Length()
{
//TODO Auto-generated method stub
size_t result = 0;
if( root &&
type == JVT_ARRAY ) {
result = root -> group.size();
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
U08 atom::CJson::GetType()
{
//TODO Auto-generated method stub
return type;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJson::Push(const CVariant & data)
{
//TODO Auto-generated method stub
bool result = false;
if( root == NULL ) {
root = tagJsonKeyValue();
root -> group.reserve( 32 );
}
if( root == NULL ) {
return false;
}
result = true;
switch( type )
{
case JVT_NONE:
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(data) ) );
type = JVT_ARRAY;
break;
case JVT_PRIMARY:
if( root -> value.Type() != VT_UNKNOW )
{
// 先把自己的值插進去
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(root -> value) ) );
root -> value.Clear();
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(data) ) );
type = JVT_ARRAY;
}
break;
case JVT_PAIR:
// 將pair的值變成數組
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(root -> value) ) );
root -> value.Clear();
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(data) ) );
type = JVT_ARRAY;
break;
case JVT_OBJECT:
{
// 將object的變成數組的第一個元素
tagJsonKeyValue value;
value.group = root -> group;
// 清理掉原有的數據，再插入到數組中
root -> group.clear();
root -> group.push_back( make_pair(0, value) );
value.group.clear();
value.value = data;
root -> group.push_back( make_pair(0, value) );
type = JVT_ARRAY;
}
break;
case JVT_ARRAY:
root -> group.push_back( make_pair(0, tagJsonKeyValue(data) ) );
break;
default:
result = false;
break;
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
bool atom::CJson::Push(const CJson & data)
{
//TODO Auto-generated method stub
bool result = false;
if( root == NULL ) {
root = tagJsonKeyValue();
root -> group.reserve( 32 );
}
if( root == NULL ) {
return false;
}
if( data.root == NULL ) {
return false;
}
// push a pair into array is not allowd
if( data.root -> index.empty() == false ) {
return false;
}
result = true;
switch( type )
{
case JVT_NONE:
{
root -> group.push_back( make_pair(0, data.root) );
type = JVT_ARRAY;
}
break;
case JVT_PRIMARY:
if( root -> value.Type() != VT_UNKNOW )
{
// push back self value first
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(root -> value) ) );
root -> value.Clear();
// push json object's value
root -> group.push_back(
make_pair(0, data.root) );
type = JVT_ARRAY;
}
break;
case JVT_PAIR:
{
// convert pair's value as a array's element
root -> group.push_back(
make_pair( 0, tagJsonKeyValue(root -> value) ) );
root -> value.Clear();
root -> group.push_back(
make_pair( 0, data.root ) );
type = JVT_ARRAY;
}
break;
case JVT_OBJECT:
{
// push objct into array.
tagJsonKeyValue value;
value.group = root -> group;
root -> group.clear();
root -> group.push_back( make_pair(0, value) );
root -> group.push_back( make_pair(0, data.root) );
type = JVT_ARRAY;
}
break;
case JVT_ARRAY:
{
root -> group.push_back( make_pair(0, data.root) );
}
break;
default:
result = false;
break;
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::a_string atom::CJson::Stringity()
{
return Stringity( root );
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::a_string atom::CJson::Stringity(const tagJsonKeyValue::Ptr & value)
{
a_string result;
if( value )
{
U08 genre = CheckType( value );
switch( genre )
{
case JVT_NONE:
result += "null";
break;
case JVT_PAIR:
result += "\"";
result += value -> index;
result += "\":";
case JVT_PRIMARY:
if( value -> value.Type() == VT_A_STR ||
value -> value.Type() == VT_W_STR )
{
result += "\"";
result += static_cast<const char *>( value -> value );
result += "\"";
}
else
{
result += static_cast<const char *>( value -> value );
}
break;
case JVT_ARRAY:
if( value -> index.empty() == false )
{
result += "\"";
result += value -> index;
result += "\":";
}
result += "[";
for( tagJsonKeyValue::Array::const_iterator
it = value -> group.begin();
it != value -> group.end(); ++ it )
{
if( it -> second )
{
result += Stringity( it -> second );
result += ", ";
}
}
result += "]";
break;
case JVT_OBJECT:
if( value -> index.empty() == false )
{
result += "\"";
result += value -> index;
result += "\":";
}
result += "{";
for( tagJsonKeyValue::Array::const_iterator
it = value -> group.begin();
it != value -> group.end(); ++ it )
{
if( it -> second )
{
result += Stringity( it -> second );
result += ", ";
}
}
result += "}";
break;
default:
break;
}
}
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::CJson atom::CJson::Clone()
{
CJson result;
result.type = type;
result.root = Clone( root );
return result;
}
//@generated "UML to C++ (com.ibm.xtools.transform.uml2.cpp.CPPTransformation)"
atom::tagJsonKeyValue atom::CJson::Clone(const tagJsonKeyValue::Ptr & data)
{
tagJsonKeyValue result;
if( !data ) {
return result;
}
result.index = data -> index;
result.value = data -> value;
// 先克隆下一層的數據；
for( tagJsonKeyValue::Array::const_iterator
it1 = data -> group.begin();
it1 != data -> group.end(); ++ it1 )
{
result.group.push_back(
make_pair( it1 -> first, Clone(it1 -> second) ) );
}
return result;
}以上就是“怎么用C++編寫一個Json解析器”這篇文章的所有內容，感謝各位的閱讀！相信大家閱讀完這篇文章都有很大的收獲，小編每天都會為大家更新不同的知識，如果還想學習更多的知識，請關注億速云行業資訊頻道。
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