題目來自<系統(tǒng)程序員成長計劃> ?

作者:李先靜.

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狀態(tài)變化如下

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#include <string> #include <iostream> using namespace std;string s = "[GRP]\n\ name = def \n\ data = 2016.11.29 \r\n\ ; this is a comment \r\n\ str = this is a test \n\ [zhangshan] \n\ ;\n\ name = pengjun \n\ data = 3355456";enum STATE {STAT_NONE = 0,STAT_GROUP,STAT_KEY,STAT_VALUE,STAT_COMMENT };void IniBufferParse(const string& s) {STATE state = STAT_NONE;size_t groupStart = 0, groupEnd = 0;size_t commentStart = 0, commentEnd = 0;size_t keyStart = 0, keyEnd = 0;for (size_t i = 0; i < s.size(); i++){switch (state){case STAT_NONE:if (s[i] == '['){ state = STAT_GROUP;groupStart = i+1;}else if (s[i] == '\r' || s[i] == '\n'){state = STAT_NONE;}else if (s[i] == ';'){state = STAT_COMMENT;commentStart = i + 1;}else if (!isspace( s[i]) ){state = STAT_KEY;keyStart = i;}break;case STAT_GROUP:if (s[i] == ']'){ state = STAT_NONE;groupEnd = i;cout << "group = " << s.substr(groupStart, groupEnd - groupStart) << endl;}else if (s[i] == '\r' || s[i] == '\n'){state = STAT_NONE;}break;case STAT_COMMENT:if (s[i] == '\r' || s[i] == '\n'){state = STAT_NONE;commentEnd = i;cout << "comment = " << s.substr(commentStart, commentEnd - commentStart) << endl;break;}break;case STAT_KEY:if (s[i] == '\r' || s[i] == '\n'){state = STAT_NONE;keyEnd = i;string kvString = s.substr(keyStart, keyEnd - keyStart);size_t i = kvString.find_first_of('=');if (i == string::npos)break;cout << "key = " << kvString.substr(0,i-1) << ". value = " << kvString.substr(i+1) << endl;break;}break;default:break;}}}int main() {IniBufferParse(s);return 0; }

　　運(yùn)行結(jié)果

group = GRP
key = name. value = def
key = data. value = 2016.11.29
comment = this is a comment
key = str. value = this is a test
group = zhangshan
comment =
key = name. value = pengjun
請按任意鍵繼續(xù). . .

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轉(zhuǎn)載于:https://www.cnblogs.com/itdef/p/6112765.html

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