Go4Expert - Config string parse to select user-entered strings.

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Config string parse to select user-entered strings.

I am trying to parse a user-entered string and separate it at all the spaces, but I don't know how to change the parameters to accept user-entered strings, just what string is programmed in for the string already.

I did not create this code, but I am trying to modify it to work like I want it to, so don't ask me the how the whole thing works.

Here is the code I am working on:

Code:

//parser class--------------------------------------------

class parser

{

        std::string text;

public:

        static const int max_field_size=100;

        

        explicit parser(const char *s) : text(s) {}

        

        void tokenize(char *fields[], int nf, const char breaker=' ')

        {

                // parses internal string, breaking at instances of <breaker>

                // which are thrown away. Returns separated values as fields

                std::istringstream buffer(text);

                int f=0;

                while (f<nf)

                {

                        buffer.getline(fields[f], max_field_size, breaker);

                        ++f;

                }

        }

};

//end of parser class--------------------------------------





int main()

{

        ...

                cin >> string s;

        parsef(s);

        ...

}



//string parsing Function----------------------------------

void parsef(string s)

{

        

        const char* userstring="RUN filename and this\n";

        char **fields = new char*[3];

        for (int i=0; i<3; ++i)

                fields[i]=new char[parser::max_field_size];

        

        parser parse(userstring);

        parse.tokenize(fields, 3);

        for (int i=0; i<3; ++i)

                cout << "word " << i << ": " << fields[i] << endl;

        

}

//end string parsing Function------------------------------

Only what I put in for 'userstring' is parsed. I don't know how to get the string I pass to the parse function to be the string parsed.

I thinking it's something simple to do, but I just can't figure it out.
Could someone help, please? And thanks.

Re: Config string parse to select user-entered strings.

it might be easier to describe the inuts you are getting and what you want the outputs to be

Re: Config string parse to select user-entered strings.

Like the old code says, the input is: const char* userstring="RUN filename and this\n";
which is only "RUN filename and this".

The output of that is:
RUN
filename
and
this

I want to enter my own string, not what already is in the code, and have that parsed at the spaces.

Ex:
when prompted for a string when the program is running, I type:
"Hello I typed this"

Output:
Hello
I
typed
this

I hope that clears that up. :)

-------------------------------------------------
Updated: I have most of the parser figured out, but I am getting an error on this line:

std::istringstream buffer(text);

error: variable `std::istringstream buffer' has initializer but incomplete type

I don't know what' wrong with the type, so could someone help me with that?

Here's the new code:

Code:

#include <iostream>

#include <string>

using namespace std;



//---------------------paerser class--------------------------------------------

class parser 

{

      std::string text;

      public:

      static const int max_field_size=100;



      explicit parser(const char *s) : text(s) {}



      void tokenize(char *fields[], int nf, const char breaker=' ') 

      {

           // parses internal string, breaking at instances of <breaker>

           // which are thrown away. Returns separated values as fields



//this is the error

           std::istringstream buffer(text);

//this is the error



           int f=0;

           while (f<nf) 

           {

                 buffer.getline(fields[f], max_field_size, breaker);

                  ++f;

           }

      }

};

//---------------------end of parser class--------------------------------------



void parsef(string s);



int main()

{

   string myString;

   cout << "Enter a string: ";

   getline(cin, myString);

   parsef(myString);



   return 0;



}





void parsef(string s)

{



   

   char **fields = new char *[3];

   for (int i = 0; i < 3; ++i)

       fields[i] = new char[parser::max_field_size];

       parser parse(s.c_str());

           for (int i = 0; i < 3; i++) {

        delete [] fields[i];

    }

    delete fields;



}

//end string parsing Function------------------------------

Re: Config string parse to select user-entered strings.

Put your code in code tags. If you don't know what that means, read the "Before you make a query" thread. Also, some Visine would be good to get the red out.

Re: Config string parse to select user-entered strings.