C-11/changeDirectory.cpp at master · awneesht/C-11 · GitHub

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#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<iterator>
#include<cstddef>
#include<regex>

using namespace std;

vector<string>split(string str)
{

vector<string>tokens;
string token;

for_each(str.begin(),str.end(),[&](char c) {
if(c != '/')
token += c;
else
{

if(token.length())
   tokens.push_back(token);
   token.clear();
}

});

if(token.length())
    tokens.push_back(token);

return tokens;

}

string changeDir(string currentDir,string targetDir)
{

vector<string>dest = split(targetDir);
string s = "/";
string st(1,targetDir[0]);
string target;
regex re("[a-z]*+(\\.\\.\\.)+[a-z]*");
smatch match1;
if(regex_search(targetDir,match1,re) && match1.size() > 1)
{
	cout <<"invalid Path"<<endl;
	return NULL;
}


if(regex_search(currentDir,match1,re) && match1.size() > 1)
{
	cout <<"invalid current Path"<<endl;
	return NULL;
}


regex re1("[a-z]+(\\.\\.)+[a-z]*");

smatch match2;
if(regex_search(targetDir,match2,re1) && match2.size() > 1)
{
	cout <<"invalid Path"<<endl;
	return NULL;
}


if(regex_search(currentDir,match2,re1) && match2.size() > 1)
{
	cout <<"invalid current Path"<<endl;
	return NULL;
}

regex re2("(\\.\\/)+");

smatch match3;
if(regex_search(targetDir,match3,re2) && match3.size() > 1)
{
	return currentDir;
}


//case like .
if((targetDir.size() == 1) && (targetDir=="."))
	return currentDir;

size_t in = targetDir.find("..");

//check for cases like ..klm
if(in!= string::npos){
string nextchar = targetDir.substr(in+2,1);
if((!nextchar.empty()) && (nextchar.compare("/")))
{
	cout<<"Error in operations "<<endl;
	return NULL;
}
}

//Go through destination

for(auto str:dest)
{

//check if found root directory as first in target
if(!st.compare("/"))
{
   target = target + "/" +str;
}

else
if(!str.compare(".."))
{
    size_t index = currentDir.find_last_of("/\\");
    currentDir = currentDir.substr(0,index);
    //in case we reached to root just display root e.g cases like ../../../..
    if(index == 0)
	  currentDir = "/";
}

else
{

    currentDir = currentDir + "/" + str;
}

}

if(!st.compare("/"))
 return target;

else
 return currentDir;

}


int main(int argc,char *argv[])
{

string currentDir,targetDir;
if(argc < 3)
{
  cout << argv[0]<<"<current Directory>" << "<new path>"<<endl;
  return 0;

}


currentDir=argv[1];
targetDir=argv[2];

cout << "current Directory: "<< currentDir<<endl;
cout << "target Directory: " << targetDir<<endl;
cout << "after operations: " <<endl;
cout <<changeDir(currentDir,targetDir);

}