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#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>
#include <fstream>
#include <vector>
using namespace std;
class ProcessFile {
string mType;
bool mHaveDimensions = false;
int mRows = 0;
int mCols = 0;
int mCount = 0;
enum {
INTS,
REALS,
PATTERN
} mTypeID;
void processHeaderOrComment(const string &line) {
if ( mType == "" ) {
if ( line.find("%%MatrixMarket") != std::string::npos ) {
stringstream is(line);
string ident, matrix, coordinate, general;
is >> ident >> matrix >> coordinate >> mType >> general;
if ( mType == "integer" ) mTypeID = INTS;
if ( mType == "real" ) mTypeID = REALS;
if ( mType == "pattern" ) mTypeID = PATTERN;
}
}
}
void processCoordData(const string &line) {
int x, y, iVal;
double rVal;
stringstream is(line);
switch ( mTypeID ) {
case INTS:
if ( is >> x >> y >> iVal ) {
}
break;
case REALS:
if ( is >> x >> y >> rVal ) {
}
break;
case PATTERN:
if ( is >> x >> y ) {
cout << "Pattern " << x << "," << y << endl;
}
break;
}
}
void processLine(const string &line) {
if ( line[0] == '%' ) {
processHeaderOrComment(line);
} else if ( !mHaveDimensions ) {
stringstream is(line);
if ( is >> mRows >> mCols >> mCount ) {
mHaveDimensions = true;
}
} else {
processCoordData(line);
}
}
public:
void processFile(const char *filename)
{
ifstream inf(filename);
if ( inf.is_open() ) {
string line;
while ( getline(inf,line) ) {
processLine(line);
}
} else {
cout << "Sorry, but the file don't exist!\n";
}
}
};
int main(int argc, char *argv[])
{
if (argc==2) {
cout <<"Filename: " << argv[1] << endl;
ProcessFile f;
f.processFile(argv[1]);
} else {
cout << "give a filename\n";
}
}
$ g++ -std=c++11 foo.cpp
$ cat sparse01.mtx
%%MatrixMarket matrix coordinate pattern general
9 9 50
1 1
2 1
$ ./a.out sparse01.mtx
Filename: sparse01.mtx
Pattern 1,1
Pattern 2,1
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