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// Implementation of common and utility stuff



#include <sstream>

#include <cassert>



#include "Common.h"



using namespace std;



///////////////////////////////////////////////////////////////////////

// Strings

const string lineString = "line";



// Whitespace characters

extern const string whitespaceList = " \t\n\r\v\a\b\f";



// Names of the "document" and "block" groups

extern const string documentGroupName = "document";

extern const string blockGroupName = "block";

///////////////////////////////////////////////////////////////////////

void 

trimString(std::string& s)

{

    if (s.length() == 0) {

        return;

    }

    

    string::size_type beg = s.find_first_not_of(whitespaceList);

    if (beg == string::npos) {

        // the string consists entirely of whitespace characters

        s.clear();

        return;

    }

    

    string::size_type end = s.find_last_not_of(whitespaceList);

    string t(s, beg, end - beg + 1);

    s.swap(t);

    

    return;

}



std::string

formatErrorMessage(int lineNumber, const std::string & text)

{

    ostringstream err;

    err << lineString << " " << lineNumber << ": " << text;

    return err.str();

}