Having the following type of input:
add name, breed, birthDate, vaccinationsCount, photograph
(eg add boo, yorkshire terrier, 01-13-2017, 7, boo puppy.jpg
)
I want to split this string to get my parameters out of it and it didn't work.
My code looked like this:
getline(cin, listOfCommands);
string functionToApply = listOfCommands.substr(0, listOfCommands.find(" "));
int position = listOfCommands.find(" ");
listOfCommands.erase(0, position + 1);
cout << listOfCommands;
if (functionToApply == "exit")
break;
else if (functionToApply == "add")
{
position = listOfCommands.find(", ");
string name = listOfCommands.substr(0, position);
listOfCommands.erase(0, position + 1);
position = listOfCommands.find(", ");
string breed = listOfCommands.substr(0, position);
listOfCommands.erase(0, position + 2);
position = listOfCommands.find(", ");
string birthDate = listOfCommands.substr(0, position);
listOfCommands.erase(0, position + 2);
position = listOfCommands.find(", ");
string nrShorts = listOfCommands.substr(0, position);
listOfCommands.erase(0, position + 2);
string photo = listOfCommands;
}
Can someone help me, please?
For this sample I'm using std::getline with custom delimiter, std::stringstream to help parse the inputed stream and std::vector to store the parameters, (if you prefer you can assign them to the variables you created for them):
#include <iostream>
#include <sstream>
#include <vector>
int main() {
std::string listOfCommands, temp, command;
std::vector<std::string> args; //container for the arguments
//retrieve command
getline(std::cin, command, ' ');
if (command == "add") {
getline(std::cin, listOfCommands);
std::stringstream ss(listOfCommands);
while (getline(ss, temp, ',')) { //parse comma separated arguments
while (*(temp.begin()) == ' ')
temp.erase(temp.begin()); //remove leading blankspaces
args.push_back(temp); // add parameter to container
}
//test print
for (std::string str : args){
std::cout << str << std::endl;
}
}
return 0;
}
Input:
add boo, yorkshire terrier, 01-13-2017, 7, boo puppy.jpg
Output:
boo
yorkshire terrier
01-13-2017
7
boo puppy.jpg
Try regex_token_iterator :
#include <regex>
const int split_constant = -1;
std::vector<std::string> args(
std::sregex_token_iterator(listOfCommands.begin(),
listOfCommands.end(),
std::regex(", "),
split_constant),
std::sregex_token_iterator());
Of course you don't have to save the tokens in a vector, you can also just iterate over them:
auto iter = std::sregex_token_iterator(listOfCommands.begin(),
listOfCommands.end(),
std::regex(", "),
split_constant);
const string functionToApply = *iter++;
if (functionToApply == "exit") break;
const string name = *iter++;
const string breed = *iter++;
// etc.
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