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copied!<pre><code>#include <iostream> #include <conio.h> #include <string> #include <map> using namespace std; struct Token { enum E { Replace, Literal, Eos }; }; class ParseExp { private: enum State { State_Begin, State_Literal, State_StartRep, State_RepWord, State_EndRep }; string m_str; int m_char; unsigned int m_length; string m_lexme; Token::E m_token; State m_state; public: void Parse(const string& str) { m_char = 0; m_str = str; m_length = str.size(); } Token::E NextToken() { if (m_char >= m_length) m_token = Token::Eos; m_lexme = ""; m_state = State_Begin; bool stop = false; while (m_char <= m_length && !stop) { char ch = m_str[m_char++]; switch (m_state) { case State_Begin: if (ch == '$') { m_state = State_StartRep; m_token = Token::Replace; continue; } else { m_state = State_Literal; m_token = Token::Literal; } break; case State_StartRep: if (ch == '{') { m_state = State_RepWord; continue; } else continue; break; case State_RepWord: if (ch == '}') { stop = true; continue; } break; case State_Literal: if (ch == '$') { stop = true; m_char--; continue; } } m_lexme += ch; } return m_token; } const string& Lexme() const { return m_lexme; } Token::E Token() const { return m_token; } }; string DoReplace(const string& str, const map<string, string>& dict) { ParseExp exp; exp.Parse(str); string ret = ""; while (exp.NextToken() != Token::Eos) { if (exp.Token() == Token::Literal) ret += exp.Lexme(); else { map<string, string>::const_iterator iter = dict.find(exp.Lexme()); if (iter != dict.end()) ret += (*iter).second; else ret += "undefined(" + exp.Lexme() + ")"; } } return ret; } int main() { map<string, string> words; words["hello"] = "hey"; words["test"] = "bla"; cout << DoReplace("${hello} world ${test} ${undef}", words); _getch(); } </code></pre> <p>I will be happy to explain anything about this code :)</p>

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