single tpl
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#include <iostream>
#include <string.h>
#include <vector>
#include <map>
#include <memory>
using namespace std;
typedef std::shared_ptr<vector<string> > VecStrPtr;
typedef vector<string> VecStr;
map<string, string> vars;
int main() {
vars["world"] = "earth";
vars["testName"] = "zivee";
vars["tm"] = "more";
string test("Hello {$world}! {$testName} , again {$tm}");
const char* tpl = test.c_str();
VecStrPtr placeholdsPtr(new VecStr);
VecStrPtr phasePtr(new VecStr);
char start = '{';
char prefix = '$';
char end = '}';
char tmp[128];
unsigned i,j;
unsigned p=0;
for (i=0; tpl[i]!='\0'; ++i) {
if (tpl[i] == start && tpl[i+1] == prefix ) {
phasePtr->push_back(test.substr(p, i-p));
for(j = 0; j<128 && tpl[i+j+2]!=end && tpl[i+j+2]!='\0'; ++j) {
tmp[j] = tpl[i+j+2];
}
tmp[j] = '\0';
i += j+2;
p = i+1;
placeholdsPtr->push_back(tmp);
}
}
if (tpl[p]!='\0') {
phasePtr->push_back(test.substr(p));
}
//share ptr
string result;
for (size_t i=0; i<placeholdsPtr->size(); ++i){
result.append(phasePtr->at(i));
result.append(vars[placeholdsPtr->at(i)]);
}
if (i < phasePtr->size()) {
result.append(phasePtr->at(i));
}
cout <<result << endl;
return 0;
}
Cpp
INFO