Function getStringWithSubstitutedVars

quest/src/core/validation.cpp:1259–1291

using tokenSubs = std::map<string, long long int>;

string getStringWithSubstitutedVars(string oldStr, tokenSubs varsAndVals) {

    string newStr = oldStr;

    // substitute every var,val pair into newStr
    for (auto varAndVal : varsAndVals) {

        // unpack var -> val
        string var = std::get<0>(varAndVal);
        string val = std::to_string(std::get<1>(varAndVal));

        // assert var is well-formed 
        if (var[0] != '$' || var[1] != '{' || var.back() != '}' )
            error_validationMessageVarWasIllFormed(newStr, var);

        // assert var appears at least once in string
        if (newStr.find(var) == string::npos)
            error_validationMessageVarNotSubstituted(newStr, var);

        // replace every occurrence of var with val
        size_t ind = newStr.find(var);
        while (ind != string::npos) {
            newStr = newStr.replace(ind, var.length(), val);
            ind = newStr.find(var, ind);
        }
    }

    // assert there is no $ left in the strings
    if (newStr.find("$") != string::npos)
        error_validationMessageContainedUnsubstitutedVars(newStr);

    return newStr;
}

void assertThat(bool valid, string msg, const char* func) {