{"id":8694,"date":"2013-08-27T16:35:17","date_gmt":"2013-08-27T08:35:17","guid":{"rendered":"https:\/\/lifeparty.idv.tw\/blog\/?p=8694"},"modified":"2014-01-25T10:55:12","modified_gmt":"2014-01-25T02:55:12","slug":"%e7%b0%a1%e5%8c%96%e8%a8%ad%e8%a8%88%e7%9a%84%e5%bb%b6%e9%81%b2%e9%81%8b%e7%ae%97%ef%bc%8d%e5%85%b6%e4%b8%80","status":"publish","type":"post","link":"https:\/\/lifeparty.idv.tw\/blog\/archives\/8694","title":{"rendered":"\u8a0a\u606f\u62c6\u89e3\u7d44\u5408\u7684\u5ba3\u544a\u5f0f\u8a9e\u610f"},"content":{"rendered":"

\u4e00\u822c\u800c\u8a00\uff0c\u7a0b\u5f0f\u78bc\u7684\u7acb\u5373\u904b\u7b97\u662f\u6bd4\u8f03\u7b26\u5408\u4eba\u5011\u60f3\u6cd5\u76f4\u89ba\u7684\u6f14\u7b97\u6cd5\uff0c\u4e5f\u5c31\u662f\u4f9d\u64da\u4e0a\u4e00\u500b\u904b\u7b97\u7684\u7d50\u679c\u4f86\u6c7a\u5b9a\u5f8c\u7e8c\u7684\u6f14\u7b97\u908f\u8f2f\u3002\u4f46\u5c0d\u8f03\u8907\u96dc\u7684\u7a0b\u5f0f\u908f\u8f2f\u800c\u8a00\uff0c\u7acb\u5373\u904b\u7b97\u5e38\u6703\u5f62\u6210\u591a\u91cd\u904b\u7b97\u8def\u5f91\u7684\u6b67\u8def\u800c\u4f7f\u7a0b\u5f0f\u7684\u958b\u767c\u8207\u7dad\u8b77\u8b8a\u5f97\u66f4\u7e41\u8907\uff0c\u9762\u5c0d\u9019\u7a2e\u72c0\u6cc1\u4e5f\u8a31\u6211\u5011\u9700\u8981\u63a1\u7528\u53e6\u4e00\u7a2e\u5178\u7bc4\u4f86\u7c21\u5316\u8a2d\u8a08\uff1b\u4e5f\u5c31\u662f\u5ef6\u5f8c\u904b\u7b97\u7684\u8655\u7406\uff0c\u7b49\u5230\u9700\u8981\u5f97\u5230\u7b54\u6848\u6642\u624d\u4e00\u6b21\u6c42\u89e3\u6f14\u7b97\u51fa\u7d50\u679c\uff0c\u7701\u537b\u8a31\u591a\u7e41\u8907\u7684\u689d\u4ef6\u5224\u65b7\u6216\u8ff4\u5708\u7684\u63a7\u5236\u3002\u5728\u9019\u88e1\u540c\u4eba\u60f3\u767c\u8868\u4e00\u7cfb\u5217\u6587\u7ae0\u5206\u4eab\u56db\u7a2e\u4e0d\u540c\u4e3b\u984c\u5ef6\u9072\u904b\u7b97\uff0c\u5b83\u5011\u90fd\u662f\u4ee5 C++ \u8a9e\u8a00\u5be6\u4f5c\u7684\u5ef6\u9072\u904b\u7b97<\/a>\uff0c\u5305\u62ec\u8a0a\u606f\u62c6\u89e3\u8207\u7d44\u5408\u3001\u62c6\u89e3\u547d\u4ee4\u5217\u3001\u8cc7\u6599\u8868\u7684\u67e5\u8a62\u3001\u4ee5\u53ca\u641c\u5c0b Xml \u627e\u5230\u7b26\u5408\u7684\u8cc7\u6599\u3002<\/p>\n

\u9996\u5148\uff0c\u9019\u4e00\u7bc7\u6587\u7ae0\u6211\u5011\u5148\u4f86\u8ac7\u8ac7\u5ef6\u9072\u904b\u7b97\u5728\u8a0a\u606f\u62c6\u89e3\u8207\u7d44\u5408\u7684\u61c9\u7528\u3002\u8003\u616e\u958b\u767c\u9700\u8981\u62c6\u89e3\u6216\u7d44\u5408\u7b26\u5408\u67d0\u4e9b\u683c\u5f0f\u7684\u5b57\u4e32\uff0c\u4e00\u500b\u7c21\u55ae\u7684\u4f5c\u6cd5\u662f\u7de8\u5beb\u5171\u901a\u7684\u51fd\u5f0f\u4f86\u62c6\u89e3\u8207\u7d44\u5408\u5b57\u4e32\u3002<\/p>\n

void parseString(const char* msg_buffer,\r\n    string& str, size_t pos = 0) {\r\n        if (pos &lt; strlen(msg_buffer)) {\r\n\t\tstr.assign(msg_buffer + pos, str.size());\r\n\t\tpos += str.size();\r\n\t}\r\n}\r\n\r\nvoid parseChar(const char* msg_buffer,\r\n    char& c, size_t pos = 0) {\r\n    if (pos &lt; strlen(msg_buffer)) {\r\n\t\tc = *(msg_buffer + pos);\r\n\t\tpos += sizeof(c);\r\n\t}\r\n}\r\n\r\nvoid tramsformString(string &response,\r\n    const string& str) {\r\n    response.append(str);\r\n}\r\n\r\nvoid transformChar(string& response,\r\n    const char& c) {\r\n    response.append(1, c);\r\n}\r\n\r\nsize_t pos = 0;\r\nstring field1(6, ' ');\r\nchar field2;\r\nstring msg = "str123x";\r\n\r\nparseString(msg.c_str(), field1, pos);\r\nparseChar(msg.c_str(), field2, pos);\r\n\r\n\/\/ do something\r\n\r\nstring response;\r\ntransformString(response, field1);\r\ntransformChar(response, field2);<\/pre>\n
\u6211\u5011\u767c\u73fe\u4e0a\u9762\u7684\u7a0b\u5f0f\u53ef\u4ee5\u628a\u8655\u7406\u62c6\u89e3\u548c\u7d44\u5408\u8a0a\u606f\u7684\u4e2d\u9593\u8b8a\u6578\uff0c\u5c01\u88dd\u6210\u62c6\u89e3\u548c\u7d44\u5408\u8a0a\u606f\u9019\u5169\u7a2e\u62bd\u8c61\u6982\u5ff5\u4e2d\uff0c\u65bc\u662f\u7522\u751f\u4e86 MessageParsing \u548c MessageTransformation \u9019\u5169\u500b class\uff0c\u7136\u5f8c\u904b\u7528 Builder \u6a23\u5f0f<\/a>\uff0c\u62c6\u89e3\u548c\u7d44\u5408\u8a0a\u606f\u7684\u7a0b\u5f0f\u78bc\u5c31\u53ef\u4ee5\u5beb\u5f97\u518d\u7c21\u55ae\u4e00\u9ede\uff1a<\/p>\n
MessageParsing::MessageParsing(const char* msg) :\u00a0\r\n    _msg_buffer(msg), _pos(0) {}\r\n\r\nMessageParsing::MessageParsing(const MessageParsing& parsing) {\r\n\tthis->_msg_buffer = parsing._msg_buffer;\r\n\tthis->_pos = parsing._pos;\r\n}\r\n\r\nMessageParsing::~MessageParsing() {\r\n}\r\n\r\nMessageParsing& MessageParsing::parse(string& str) {\r\n\treturn this->parse(str, str.size());\r\n}\r\n\r\nMessageParsing& MessageParsing::parse(string& str, size_t n) {\r\n\tif (this->_pos < strlen(this->_msg_buffer)) {\r\n\t\tstr.assign(this->_msg_buffer + this->_pos, n);\r\n\t\tthis->_pos += str.size();\r\n\t}\r\n\treturn *this;\r\n}\r\n\r\nMessageParsing& MessageParsing::parse(char& c) {\r\n\tif (this->_pos < strlen(this->_msg_buffer)) {\r\n\t\tc = *(this->_msg_buffer + this->_pos);\r\n\t\tthis->_pos += sizeof(c);\r\n\t}\r\n\treturn *this;\r\n}\r\n\r\nconst char* MessageParsing::getRemain() const {\r\n\treturn this->_msg_buffer + this->_pos;\r\n}\r\n\r\nMessageTransformation::MessageTransformation() :\r\n    _result(EMPTY_STR) {\r\n}\r\n\r\nMessageTransformation::MessageTransformation(\r\n    const MessageTransformation& trnfrmtn) {\r\n\tthis->_result = trnfrmtn._result;\r\n}\r\n\r\nMessageTransformation::~MessageTransformation() {\r\n}\r\n\r\nMessageTransformation& MessageTransformation::transform(\r\n    const string& str) {\r\n        this->_result.append(str);\r\n\treturn *this;\r\n}\r\n\r\nMessageTransformation& MessageTransformation::transform(\r\n    const char& c) {\r\n\tthis->_result.append(1, c);\r\n\treturn *this;\r\n}\r\n\r\nstring MessageTransformation::str() const {\r\n\treturn this->_result;\r\n}\r\n\r\nstring field1(6, ' ');\r\nchar field2;\r\n\r\nbool parseOk = MessageParsing("str123x")\r\n    .parse(field1).parse(field2).getRemain() == '\\0';\r\n\r\n\/\/ do something\r\n\r\nstring response = MessageTransformation()\r\n    .transform(field1).transform(field2).str();<\/pre>\n
\u5230\u9019\u88e1\uff0c\u6211\u5011\u770b\u5230\u4e0d\u7ba1\u8a0a\u606f\u62c6\u89e3\u6216\u662f\u8a0a\u606f\u7d44\u5408\uff0c\u90fd\u662f\u4f9d\u5e8f\u6309\u7167\u6b04\u4f4d\u5f62\u614b\u53ca\u9577\u5ea6\u5b58\u53d6\u8a0a\u606f\u5b57\u4e32\uff0c\u5b83\u986f\u793a\u51fa\u8a0a\u606f\u683c\u5f0f\u7684\u6982\u5ff5\u3002\u90a3\u9ebc\u85c9\u7531\u8a0a\u606f\u683c\u5f0f\uff0c\u5982\u679c\u53ef\u4ee5\u628a\u62c6\u89e3\u548c\u7d44\u5408\u8a0a\u606f\u7684\u6f14\u7b97\u62bd\u96e2\u958b\u4f86\uff0c\u9019\u6a23\u8a0a\u606f\u683c\u5f0f\u5c31\u53ef\u4ee5\u88ab\u8a0a\u606f\u62c6\u89e3\u53ca\u7d44\u5408\u91cd\u8907\u4f7f\u7528\u4e86\u3002\u7576\u7136\u6211\u5011\u53ef\u4ee5\u904b\u7528 visitor \u6a23\u5f0f<\/a>\u4f86\u9054\u5230\u9019\u6a23\u7684\u76ee\u7684\uff0c\u90a3\u9ebc\u4f7f\u7528\u60c5\u5883\u5c31\u6703\u9577\u5f97\u50cf\u4e0b\u9762\u9019\u4e00\u6bb5\u7a0b\u5f0f\u78bc\u9019\u6a23\uff1a<\/p>\n
bool done = MessageFormat()\r\n\t.append(new Field<string>(model.fieldA, 9))\r\n\t.append(new Field<char>(model.fieldB))\r\n\t.with(MessageParse("123456789ABC"))\r\n \t.execute();\r\n\r\nbool done = MessageFormat()\r\n \t.append(new Field<string>(model.fieldA, 9))\r\n \t.append(new Field<char>(model.fieldB))\r\n \t.with(MessageTransform())\r\n\t.execute();<\/pre>\n
\u8acb\u6ce8\u610f\uff0c\u4ee5\u4e0a\u7a0b\u5f0f\u78bc\u5728 with() \u6240\u50b3\u5165\u7684 FieldVisitor \u4e26\u4e0d\u53ea\u9650\u4e00\u500b\uff0c\u540c\u4eba\u69cb\u60f3\u7684\u9019\u500b\u8a2d\u8a08\u662f\u53ef\u4ee5\u5bb9\u7d0d\u591a\u500b FieldVisitor\uff0c\u800c\u4e14\u4e5f\u4e0d\u9650\u65bc MassageParse \u53ca MessageTransform \u5169\u7a2e FieldVisitor\u3002\u4f8b\u5982\u4f7f\u7528\u60c5\u5883\u53ef\u80fd\u662f\u8981\u6aa2\u6838\u8a0a\u606f\u8a9e\u6cd5\u6b63\u78ba\u5f8c\u518d\u89e3\u6790\u6b04\u4f4d\u3001\u751a\u81f3\u5728\u89e3\u6790\u6b04\u4f4d\u5f8c\u6703\u5c07\u8a0a\u606f\u8f49\u63db\u6210\u4e0d\u540c\u7684\u5a92\u9ad4\uff0c\u56e0\u6b64 MessageFormat \u5728\u52a0\u5165\u6b04\u4f4d\u5f8c\u50b3\u56de\u81ea\u5df1\u7684\u53c3\u8003\uff0c\u8b93\u547c\u53eb\u7aef\u53ef\u4ee5\u8996\u9700\u8981\u53ef\u4ee5\u63a5\u53d7\u591a\u500b FieldVisitor\uff0c\u5b83\u7684\u754c\u9762\u5927\u81f4\u9577\u50cf\u662f\u9019\u6a23\uff1a<\/p>\n
template <typename T>\r\nclass Field;\r\n\r\nclass FieldVisit {\r\nprotected:\r\n\tbool _valid;\r\n\r\npublic:\r\n\tFieldVisit() : _valid (true) {\r\n\t}\r\n\r\n\tvirtual ~FieldVisit() {\r\n\t}\r\n\r\npublic:\r\n\tvirtual void operator() (Field<string>& field) = 0;\r\n\tvirtual void operator() (Field<char>& field) = 0;\r\n\tvirtual void operator() (Field<int>& field) = 0;\r\n\tvirtual void operator() (Field<double>& field) = 0;\r\n\r\n\tvirtual operator bool() {\r\n\t\treturn _valid;\r\n\t}\r\n\r\n};\r\n\r\nclass FieldBase {\r\npublic:\r\n\tvirtual void operator() (FieldVisit& visit) = 0;\r\n};\r\n\r\ntemplate <typename T>\r\nclass Field : public FieldBase {\r\nprivate:\r\n\tT& _ref;\r\n\tsize_t _len;\r\n\r\npublic:\r\n\tField(T& ref, size_t len = 1) : _ref(ref), _len(len) {\r\n\t}\r\n\r\n\t~Field() {\r\n\t}\r\n\r\npublic:\r\n\tT& getRef() const {\r\n\t\treturn _ref;\r\n\t}\r\n\r\n\tsize_t getSize() const {\r\n\t\treturn _len;\r\n\t}\r\n\r\npublic:\r\n\tvoid operator() (FieldVisit& visit) {\r\n\t\tvisit(*this);\r\n\t}\r\n\r\n};\r\n\r\ntemplate <>\r\nclass Field<double> : public FieldBase {\r\nprivate:\r\n\tdouble& _ref;\r\n\tsize_t _width;\r\n\tsize_t _precision;\r\n\r\npublic:\r\n\tField(double& ref, size_t width, size_t precision) :\r\n            _ref(ref), _width(width), _precision(precision) {}\r\n\r\n\t~Field() {}\r\n\r\npublic:\r\n\tdouble& getRef() const {\r\n\t\treturn _ref;\r\n\t}\r\n\r\n\tsize_t getWidth() const {\r\n\t\treturn _width;\r\n\t}\r\n\r\n\tsize_t getPrecision() const {\r\n\t\treturn _precision;\r\n\t}\r\n\r\npublic:\r\n\tvoid operator() (FieldVisit& visit) {\r\n\t\tvisit(*this);\r\n\t}\r\n\r\n};<\/pre>\n
\u5be6\u4f5c FieldVisitor \u7684\u985e\u5225\u5229\u7528\u51fd\u6578\u904b\u7b97\u5143\u4f86\u5be6\u4f5c\u8a0a\u606f\u6b04\u4f4d\u7684\u5b58\u53d6\uff0c\u4e26\u4e14\u5be6\u4f5c\u5e03\u6797\u904b\u7b97\u5b50\u5224\u65b7\u662f\u5426\u5df2\u767c\u751f\u932f\u8aa4\uff0c\u4ee5\u4e2d\u65b7\u8a0a\u606f\u683c\u5f0f\u7684\u8655\u7406\u3002\u9019\u6a23\u4e00\u4f86\uff0cMessageFormat \u7684\u8655\u7406\u5c31\u4e26\u4e0d\u6703\u5f88\u8907\u96dc\uff0c\u7531\u547c\u53eb\u8005\u4f9d\u5e8f\u52a0\u5165\u8a0a\u606f\u7684\u6b04\u4f4d\u4e26\u4e14\u6307\u5b9a\u5982\u4f55\u8655\u7406\u8a0a\u606f\uff0c\u7136\u5f8c\u518d\u547c\u53eb execute() \u4f86\u505a\u4e00\u6b21\u6027\u7684\u8655\u7406\uff0c\u5b83\u7684\u57fa\u672c\u6982\u5ff5\u6b63\u662f\u5ef6\u9072\u904b\u7b97\uff0c\u5982\u6b64\u5c31\u53ef\u4ee5\u7c21\u55ae\u800c\u6709\u5f48\u6027\u5730\u5be6\u4f5c\u51fa MessageFormat\uff1a<\/p>\n
class MessageFormat {\r\nprivate:\r\n\tlist<shared_ptr<FieldBase> > _fields;\r\n\tlist<FieldVisit*> _visitlist;\r\n\r\npublic:\r\n\tMessageFormat();\r\n\tvirtual ~MessageFormat();\r\n\r\npublic:\r\n\tMessageFormat& append(FieldBase* field) {\r\n\t \t_fields.push_back(shared_ptr<FieldBase>(field));\r\n\t\treturn *this;\r\n\t}\r\n\r\n\tMessageFormat& with(FieldVisit& visit) {\r\n\t\t_visitlist.push_back(&visit);\r\n\t\treturn *this;\r\n\t}\r\n\r\n\tbool execute() {\r\n\t\tlist<FieldVisit*>::iterator vst;\r\n\t\tfor (vst = _visitlist.begin();\r\n                    vst != _visitlist.end(); vst ++) {\r\n\t\t\tlist<shared_ptr<FieldBase> >::iterator fld;\r\n\t\t\tsize_t pos;\r\n\t\t\tfor (pos = 0, fld = _fields.begin();\r\n                            fld != _fields.end(); fld ++) {\r\n\t\t\t\t(*fld->get())(**vst);\r\n\t\t\t\tif (*(*vst)) {\r\n\t\t\t\t\treturn false;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t}\r\n\t\treturn true;\r\n\t}\r\n};<\/pre>\n
\u63a5\u4e0b\u4f86\u628a\u8a0a\u606f\u62c6\u89e3\u53ca\u7d44\u5408\u7684\u5be6\u4f5c\u642c\u5230 MessageParse \u53ca MessageTransform \u7684\u51fd\u6578\u904b\u7b97\u5143\uff0c\u4e26\u4e14\u52a0\u5165\u5176\u5b83\u4e0d\u540c\u7684\u8cc7\u6599\u578b\u614b\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u4f9d\u7167\u7279\u5b9a\u683c\u5f0f\u5305\u62ec\u6b04\u4f4d\u5f62\u614b\u3001\u9577\u5ea6\u53ca\u9806\u5e8f\u6b63\u5e38\u62c6\u89e3\u548c\u7d44\u5408\u8a0a\u606f\u3002<\/p>\n
MessageParse::MessageParse(const char* source) :\r\n        _source(source), _pos(0) {}\r\n\r\nMessageParse::~MessageParse() {}\r\n\r\nvoid MessageParse::operator() (Field<string>& field) {\r\n\tif (_pos < _source.size()) {\r\n\t\tfield.getRef().replace(0, field.getSize(),\r\n                    _source.substr(_pos, field.getSize()));\r\n\t\t_pos += field.getSize();\r\n\t}\r\n\telse {\r\n\t\t_valid = false;\r\n\t}\r\n}\r\n\r\nvoid MessageParse::operator() (Field<char>& field) {\r\n\tif (_pos < _source.size()) {\r\n\t\tfield.getRef() = _source.at(_pos);\r\n\t\t_pos ++;\r\n\t}\r\n\telse {\r\n\t\t_valid = false;\r\n\t}\r\n}\r\n\r\nvoid MessageParse::operator() (Field<int>& field) {\r\n\tif (_pos < _source.size()) {\r\n\t\tfield.getRef() = atoi(_source.substr(_pos,\r\n                    field.getSize()).c_str());\r\n\t\t_pos += field.getSize();\r\n\t}\r\n\telse {\r\n\t\t_valid = false;\r\n\t}\r\n}\r\n\r\nvoid MessageParse::operator() (Field<double>& field) {\r\n\tif (_pos < _source.size()) {\r\n\t\tdouble fldval = atof(_source.substr(_pos,\r\n                    field.getWidth()).c_str());\r\n\t\tif (field.getPrecision() > 0) {\r\n\t\t\tfldval \/= pow(10.0, field.getPrecision());\r\n\t\t}\r\n\t\tfield.getRef() = fldval;\r\n\t\t_pos += field.getWidth();\r\n\t}\r\n\telse {\r\n\t\t_valid = false;\r\n\t}\r\n}\r\n\r\nbool MessageParse::hasDone() const {\r\n\treturn ((!_valid || _pos < _source.size()) ? false : true);\r\n}\r\n\r\nMessageTransform::MessageTransform() : _str(EMPTY_STR) {}\r\n\r\nMessageTransform::~MessageTransform() {}\r\n\r\nvoid MessageTransform::operator() (Field<string>& field) {\r\n\t_str.append(field.getRef(), 0, field.getSize());\r\n}\r\n\r\nvoid MessageTransform::operator() (Field<char>& field) {\r\n\t_str.append(1, field.getRef());\r\n}\r\n\r\nvoid MessageTransform::operator() (Field<int>& field) {\r\n\tostringstream oss;\r\n\toss.width(field.getSize());\r\n\toss.fill('0');\r\n\toss << right << field.getRef();\r\n\t_str.append(oss.str());\r\n}\r\n\r\nvoid MessageTransform::operator() (Field<double>& field) {\r\n\tostringstream oss;\r\n\toss.width(field.getWidth());\r\n\toss.precision(field.getPrecision());\r\n\toss.fill('0');\r\n\toss << fixed << right << field.getRef();\r\n\t_str.append(oss.str());\r\n}\r\n\r\nstring MessageTransform::str() const {\r\n\treturn _str;\r\n}<\/pre>\n
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